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    • 专利摘要:
    The invention relates to methods, compositions and cementing systems. The method involves the use of a long-life cement composition containing calcium aluminate cement, water, a cement setting retarder and a delayed release cement setting activator. The method further includes introducing the extended life cement composition into a subterranean formation and allowing the extended life cement composition to take up the subterranean formation. The extended-life cement composition has a thickening time of at least about two hours.
    公开号:FR3038613A1
    申请号:FR1655181
    申请日:2016-06-07
    公开日:2017-01-13
    发明作者:Thomas Jason Pisklak；Agapiou Kyriacos；Samuel J Lewis
    申请人:Halliburton Energy Services Inc；
    IPC主号:
    专利说明:

    CONTROLLED ACTIVATION OF LIFETIME CEMENT COMPOSITIONS
    EXTENDED
    CONTEXT
    The invention relates to methods for retarding the activation of long life cement compositions and more particularly methods for controlling the activation of long-life cement compositions containing Cement-based cement. calcium aluminate in well operations.
    [0002] Cement compositions can be used in a number of subterranean operations. In an underground well construction, for example, a string of tubes (eg casing, liners, expandable tubular pieces, etc.) can be introduced into a wellbore and cemented in the well. The cementing process of the on-site tubular string is commonly referred to as "primary cementation". In a typical primary cementation process, a cementitious composition may be pumped into an annular space, between the walls of the wellbore and the outer surface of the tube string therein. The cementitious composition can harden in the annulus, thereby forming an annular, substantially impermeable, hardened cementitious sheath (eg, cement sheath) that can support and position the string of tubes in the well bore and which can bond the outer surface of the tube train to the subterranean formation. The cement sheath surrounding the tube train can, among other things, prevent the migration of fluids into the annulus, and can also protect the tube train against corrosion. The cement compositions can also be used in remediation cementing processes for sealing cracks or holes in tube trains or cement sheaths, sealing highly permeable formation areas or fractures, or for placing a plug cement, etc.
    [0003] A wide variety of cement compositions has been used in underground cementing operations. In some cases, extended life cement compositions have been used. In contrast to conventional cement compositions which set and cure during their preparation, extended life cement compositions are characterized by being able to remain in a pumpable fluid state for at least one day (e.g. at least about 7 days, about 2 weeks or about 2 years or more) at room temperature (e.g., about 80 ° F) during storage. When needed, one must be able to activate extended life cement compositions and then develop reasonable compressive strengths. For example, an extended-life cement composition that is activated can take a hardened mass. Extended life cement compositions may be suitable for use in wellbore applications such as applications where it is desired to prepare the cement composition in advance, among other things. This can allow the preservation of the cement composition before use. In addition, this can make it possible to prepare the extended life cement composition in a suitable place before transporting it to the operating site. As a result, capital expenditures can be reduced by reducing the need for large on-site storage and blending equipment. This can be particularly useful for offshore cementing operations where space on board ships may be limited.
    [0004] While developed life-extended cement compositions have been developed so far, there are challenges to the success of their use in underground cementing operations. Some extended life compositions may for example have limited use at relatively low temperatures because they may not develop sufficient compressive strength when used in subterranean formations where static well bottom temperatures prevail. relatively low. In addition, it may be problematic to activate certain extended life cement compositions while maintaining acceptable thickening times and compressive strength development.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The drawings illustrate certain aspects of some of the embodiments of the present method, and should not be used to limit or define the method.
    [0006] Figure 1 illustrates a system for preparing and introducing a calcium aluminate cement cement composition with extended life in a wellbore according to some examples.
    [0007] Figure 2 illustrates a surface equipment that can be used to place a long life calcium aluminate cement composition in a wellbore in accordance with some examples.
    [0008] FIG. 3 illustrates the placement of a long lived life-sustaining calcium aluminate cement composition in a wellbore annulus according to some examples.
    DETAILED DESCRIPTION
    The invention relates to methods for retarding the activation of long-life cement compositions and more particularly to methods for controlling the activation of long-life cement compositions containing Cement-based cement. calcium aluminate in well operations.
    In this context, the extended life cement compositions may contain calcium aluminate cement, water, a cement setting retarder, and a delayed release cement setting activator. Optionally, extended life cement compositions may contain a calcium aluminate cement setting accelerator and / or a dispersing agent. Advantageously, the extended life cement compositions may be able to remain in a pumpable fluid state for an extended period of time, i.e. they are able to remain in a pumpable fluid state for at least one day (eg about 7 days, about 2 weeks, about 2 years or more) at room temperature (eg, about 80 ° F) when a storage. Generally, extended life cement compositions may develop some compressive strength after activation. Advantageously, extended life cement compositions can develop reasonable compressive strengths at relatively low temperatures (eg temperatures near 70 ° C or below about 140 ° F). Thus, while extended life cement compositions may be appropriate for a number of underground cementing operations, they may be particularly suitable for use in underground formations where static bottom temperatures prevail. relatively low wells, eg, temperatures close to 70 ° C or less than about 140 ° F. Alternatively, extended life cement compositions can be used in subterranean formations where downhole static temperatures of up to 450 ° F prevail.
    Extended life cement compositions may contain a calcium aluminate cement. Any cement based on calcium aluminate may be suitable for this purpose. Calcium aluminate cements may be described as cements containing calcium aluminates in excess of 50% by weight of the calcium aluminate dry cement (ie cement based on calcium aluminate before adding water or other adjuvants). Calcium aluminate can be defined as any calcium aluminate including, but not limited to, monocalcium aluminate, monocalcium dialuminate, tricalcium aluminate, dodeca calcium heptaluminate, hexa monocalcium aluminate, dicalcium aluminate, pentacalcium tri-aluminate, tetracalcium tri-aluminate and the like. Calcium aluminate SECAR 71®, which is commercially available from Kemeos ™ Aluminate Technologies, is an example of suitable calcium aluminate. The calcium aluminate cement may be part of the extended life cement compositions, on the one hand, without limitation, from about 10% to about 80% by weight of the extended life cement compositions. For example, the calcium aluminate cement may be present in any one of the ranges and / or any of about 10%, about 15%, about 20%, about 25%, about 30%, about 35%, about 40%, about 45%, about 50%, about 55%, about 60%, about 65% %, about 70%, about 75% or about 80% by weight of the extended life cement composition. With the benefit of this description, a person skilled in the art will be able to choose a suitable type of calcium aluminate cement and will have to recognize the good part of calcium aluminate cement to include for a chosen application.
    Extended life cement compositions may contain a cement setting retarder. Examples of a cement setting retarder may include, but are not limited to, hydroxycarboxylic acids such as citric acid, tartaric acid, gluconic acids or their respective salts, boric acid or its respective salt and combinations thereof. The Fe-2 ™ iron sequestering agent available from Halliburton Energy Services, Inc. of Houston, Texas is a commercial example of a suitable cement setting retarder. Generally, the cement setting retarder may be present in the extended-life cement compositions in a manner sufficient to retard setting for a desired period of time. The cement setting retarder may be present in the extended life cement compositions on the one hand, without limitation, from about 0.01% to about 10% by weight of the calcium aluminate cement. More particularly, the cement setting retarder may be present in any one of the ranges and / or any of about 0.01%, about 0.1%, about 1% , about 2%, about 4%, about 6%, about 8%, or about 10% by weight of the calcium aluminate cement. In addition, it is important to use cement setting retarders that do not undesirably affect extended life cement compositions, for example, by increasing the pH of extended life cement compositions, unless is desired. With the benefit of this description, one skilled in the art will be able to select an appropriate type of cement setting retarder and must recognize the good part of the cement setting retarder to include for a chosen application.
    Extended life cement compositions may contain water. The water may be from any source provided that it does not contain any excess of compounds that may have an adverse effect on other components in the extended life cement compositions, for example it may be desirable that no compound present in the water will raise the alkalinity of the extended life cement compositions unless desired. The water can be fresh water or salt water. Salt water can generally contain at least one dissolved salt and can be saturated or unsaturated as desired for a particular application. Seawater or brines may be suitable for use in certain applications. In addition, the water may be present in a proportion sufficient to form a pumpable composition. Without limitation, the water may for example be present in the extended-life cement compositions in an amount of from about 20% to about 90% by weight of the extended life cement composition. For example, the water may be present in any one of the ranges and / or any of about 20%, about 25%, about 30%, about 35%, about 40%, 45%, about 50%, about 55%, about 60%, about 65%, about 70%, about 75%, about 80% of about 85% or about 90% by weight of the extended life cement composition. With the benefit of this description, one skilled in the art will be able to choose the right amount of water to include for a chosen application.
    [0014] Extended life cement compositions may optionally contain cement setting activator when it is desirable to induce setting of extended life cement compositions. The delayed release cement setting activator may contain a cement setting activator which has a delayed introduction into the extended life cement composition. Some cement setting activators may further act as cement setting accelerators and may accelerate the development of compressive strength in extended life cement compositions, in addition to activating cement compositions. extended life. A cement setting activator may be any alkaline species that sufficiently increases the pH of the extended life cement compositions to the point of initiating hydration reactions in the extended life cement compositions, but without interfering with them. in addition with the setting of cement compositions with extended life. Without being limited by theory, it is believed that activation may be induced by the fact that the cement-setting activator removes the barrier to hydration caused by the cement-setting retardants present in the cement-time compositions. of prolonged life. In addition, it is believed that the significant exotherm associated with calcium aluminate cement production results in a temperature increase sufficiently large that the extended life cement compositions can take at significantly lower temperatures than other types of cement compositions with extended life. Potential examples of delayed release cement setting activators may include, but are not limited to: hydroxides of groups IA and IIA such as sodium hydroxide, magnesium hydroxide and calcium hydroxide; alkaline aluminates such as sodium aluminate; Portland cement, and the like. The delayed-release cement-setting activator may be present in the extended-life cement compositions on the one hand, without limitation, from about 0.01% to about 10% by weight of the calcium aluminate cement . More particularly, the delayed release cement setting activator may be present in any one of the following ranges and / or any of about 0.01%, about 0.1%, about 1%, about 2%, about 4%, about 6%, about 8%, or about 10% by weight of the calcium aluminate cement.
    As noted above, the cement setting activators may contain calcium hydroxide that may be called hydrated lime. In this context, the name "hydrated lime" means calcium hydroxide. In some embodiments, the hydrated lime can be provided in the form of quicklime (calcium oxide) which hydrates when dissolved in water to form the hydrated lime. The hydrated lime may for example be included to activate the extended-life cement compositions.
    As mentioned above, the cement setting activator may contain Portland cement. Examples of such Portland cements include, but are not limited to, Class A, C, H or G cements according to the American Petroleum Institute, API Specification for Materials and Testing for Well Cements, API Specification 10, 5th ed. July 1, 1990. In addition, Portland cement may contain Portland cements classified as ASTM Type I, II, III, IV or V.
    The delayed release cement setting activator may contain a cement setting activator which has a delayed introduction into the extended life cement composition. The cement setting activator may be combined with a binder to produce a delayed release cement setting activator. The binder can be used to provide a structure for which to maintain the cement setting activator in at least one mass to allow assay of the cement setting activator. Suitable binders include, but are not limited to, silica gel, aluminosilicate, chitosan and cellulose, their derivatives and combinations thereof. The amount of binder used depends on the chosen cement setting activator and the desired degree at which the chosen cement setting activator is to be bonded.
    The setting activator and the binder may be combined to form a slurry or paste, and then allowed to dry and cure to form the delayed release cement setting activator. Once in a hardened form, the delayed release cement setting activator can be cut or broken into small particles and sized using a sieve. Generally, the particles have a size that allows them to be transportable into an underground formation and mixed with a long-life cement composition. In some examples, the particles may range in size from about 30 to about 80 mesh. In this context, the "mesh" unit corresponds to the US standard size mesh (USA).
    Due to the nature of the binder of this dimensioned particle form of the delayed release cement setting activator, the delayed release cement setting activator can be released slowly and thereby activate the cement composition to extended life at a lower speed compared to a cement setting activator that has not been combined with a binder. In some examples, the release of the retarded-release cement setting activator can be further delayed by encapsulating the cement-setting activator with an outer coating (eg a degradable coating that degrades at the bottom of the well). which further limits the release of the delayed-release cement setting activator. In this context, the term "coating" or "outer coating" and similar expressions in no way prejudge the particle's degree of coating on the particle. In particular, the term "coating" in no way prejudices the 100% coverage by the coating on the particle. In some examples, an outer coating, including the degree of coating, can be used to control the release rate of the delayed release cement setting activator. In a specific example, for example, the outer coating may be designed to interfere with the release of the delayed release cement setting activator until the extended life cement composition is in the portion of the subterranean formation. to cement, while the outer coating may degrade due to high temperatures in the subterranean formation and the delayed release cement setting activator may be released throughout the extended life cement composition. The delay time of release of the cement setting activator may be in any interval and / or comprise any value from about 1 minute to about 24 hours. The time for the release delay may for example be in any interval and / or include any value of about 1 minute, about 5 minutes, about 30 minutes, about 1 hour, about 6 hours, about 12 hours or about 24 hours. hours. Operational factors such as pump flow, driving dimensions and similar parameters can affect the delay time.
    The outer coating may consist of a water-soluble material having a melting point of, for example, between about 100 ° F and about 500 ° F. The water insoluble material can prevent the outer coating from dissolving in the extended life cement compositions as desired. Suitable coating materials may include but are not limited to polysaccharides such as dextran and cellulose, chitins, lipids, latex, wax, chitosans, proteins, aliphatic polyesters, poly (lactides), poly (glycolides), poly (ε-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), poly (oxides) ethylene), polyphosphazenes, their derivatives, their copolymers or a combination thereof.
    The delayed release cement setting activator (with or without an outer coating) may slowly degrade or dissociate in long life cement compositions. This may result in a change in the pH of the extended life cement composition at the bottom of the well. The introduction of the pH-modifying component from the retarded introduction cement activator can be controlled by time and / or temperature. The delayed release cement setting activator may be formulated to release the pH altering component over time into the wellbore or after the cement setting activator is exposed to a certain temperature in the wellbore. wellbore. Due to these adjustable properties, a delayed release cement setting activator can be added to the extended life cement compositions before and / or during storage, while the cement setting activators that do not contain a Delayed introduction agent can be added in the extended-life cement compositions only when the delayed-release cement composition has been introduced into the subterranean formation or after the delayed-release cement composition has been introduced into the formation. underground. As such, the delayed release cement setting activator may be dry blended with the extended shelf life cement composition and stored, or may be added into a long lived and stored cement composition. In some specific examples, the additional mixing steps of adding delayed release cement setting activator can be eliminated, and the storage and mixing operations can be simplified thereby. If desired, the delayed release cement setting activator may also be added to the extended life cement composition immediately prior to the introduction of the extended life cement composition into the subterranean formation or otherwise the delayed release cement setting activator may be added to the extended life cement composition when the extended life cement composition is introduced into the subterranean formation.
    It should be understood that delayed-release Cement Activator can also sufficiently activate any delayed or dormant system where hydration has been blocked or slowed down. The delayed release cement setting activator can therefore be used in a number of cementation systems including those which do not have extended life properties and those which do not use aluminum aluminate cement. calcium. In addition, the delayed introduction properties of the delayed release cement setting activator can also be used to produce a similar delayed activation in other types of cementing systems.
    As already indicated, the extended life cement compositions may optionally contain a dispersing agent. Examples of suitable dispersants may include, without limitation, sulfonated formaldehyde dispersants (eg, sulfonated acetone formaldehyde condensate), examples of which may include Daxad® 19 dispersant available from Geo Specialty Chemicals, Ambler, Pennsylvania. . In addition, polyoxyethylene phosphonates and polyox polycarboxylates can be used. Other suitable dispersants may be polycarboxyl ether dispersants such as Liquiment® 5581F and Liquiment® 514L dispersants available from BASF of Houston, Texas; or Ethacryl ™ G dispersant available from Coatex, Genay, France. Another example of a suitable and commercially available dispersant is CFR ™ -3 dispersant available from Halliburton Energy Services, Inc., a suitable cement. The Liquiment® 514L dispersant can contain 36% by weight of the polycarboxyl ether in water.
    While a number of dispersants can be used, some dispersants used can be used with specific retarding agents of setting the cement. In addition, dispersants which do not adversely affect extended life cement compositions may be used, for example by induction of early setting. With the benefit of this description, one skilled in the art will be able to choose the right type of dispersant to include for a chosen application.
    The dispersant may be present, without limitation, in the extended-life cement compositions in a proportion of from about 0.01% to about 5% by weight of the calcium aluminate cement. More particularly, the dispersant may be present in any one of the ranges and / or any of about 0.01%, about 0.1%, about 0.5%, or about 1%, about 2%, about 3%, about 4%, or about 5% by weight of the calcium aluminate cement. With the benefit of this description, one skilled in the art will be able to choose the right dispersant content to include for a chosen application.
    The extended life cement compositions may optionally contain a lithium salt capable of acting as an accelerator of the setting of the cement. A cement setting accelerator can accelerate the development of compressive strength once an extended life cement composition has been activated, but the cement setting accelerator, unless otherwise stated, induces not itself activating the cement composition with extended life. Examples of suitable lithium salts include, but are not limited to, lithium sulfate and lithium carbonate. Without being limited to theory, it is believed that lithium ions increase the number of nucleation sites for hydrate formation in calcium aluminate cement. Thus, when the calcium aluminate cement is activated by combination with a cement setting activator, the presence of lithium salts can accelerate the development of compressive strength of the calcium aluminate cement. It is preferred that the lithium salt be added only to retarded or dormant calcium aluminate cements. The introduction of a lithium salt into a non-delayed or non-dormant calcium aluminate cement can elevate the calcium aluminate cement alkalinity sufficiently large to induce early setting of the aluminate cement of calcium, depending of course on the specific calcium aluminate cement used and other components present in the composition. However, lithium salts added to delayed or dormant calcium aluminate cements can prevent this risk. The lithium salt may be present, without limitation, in the extended-life cement compositions in a range of from about 0.01% to about 10% by weight of the calcium aluminate cement. More particularly, the lithium salt may be present in any one of the ranges and / or any of about 0.01%, about 0.1%, about 0.5% , about 1%, about 2%, about 3%, about 4%, about 5%, or about 10% by weight of the calcium aluminate cement. With the benefit of this description, one skilled in the art will be able to choose the right amount of lithium salt to include for a chosen application.
    Extended life cement compositions may contain a polyphosphate. Any compound containing a polyphosphate, phosphate salt or the like may suffice. Examples of polyphosphates may contain sodium polyphosphates, such as sodium hexametaphosphate, sodium polytriphosphate, potassium polyphosphates, such as potassium tripolyphosphate, similar compounds or a combination thereof. An example of a suitable polyphosphate is CALGON® sodium polyphosphate, available from Calgon Carbon Corporation, Pittsburgh, Pennsylvania. The polyphosphate can be added to other components of the extended life cement composition as an aqueous solution. Alternatively, the polyphosphate in the other components of the extended-life cement composition can be added as a dry solid or dry solid particles. The polyphosphate may be part of the extended life cement compositions in a desirable amount for a particular application, as will be apparent to those skilled in this art. The polyphosphate may, for example, be present in the extended-life cement compositions in an amount of from about 0% to about 30% by weight of the extended life cement compositions. For example, the polyphosphate may be present in any one of the ranges and / or any of about 0%, about 5%, about 10%, about 15%, or about 5%. about 20%, about 25%, about 30% by weight of the extended life cement composition. With the benefit of this description, a person skilled in the art will be able to choose an appropriate type of polyphosphate and must recognize the good part of polyphosphate to include for a chosen application.
    Extended life cement compositions may optionally contain a filler material. The filler material used for the extended life cement composition may contain any filler material, provided that said filler material does not unreasonably raise the alkalinity of the extended life cement compositions as an increase in alkalinity can induce early setting of extended life cement compositions. Without limitation, the filler material may contain silica, sand, fly ash, or silica fume. Generally, the filler material may be present in the extended life cement compositions in a sufficient amount to render the system economically competitive. The filler material may be present in the extended life cement compositions on the one hand, without limitation, from about 0.01% to about 100% by weight of the calcium aluminate cement. More particularly, the filler material may be present in any one of the ranges and / or any of about 0.01%, about 0.1%, about 1%, or about 0.01%. about 10%, about 25%, about 50%, about 75%, or about 100% by weight of the calcium aluminate cement. With the benefit of this description, one skilled in the art will be able to choose the right amount of filler material to include for a chosen application.
    Other adjuvants suitable for underground cementing operations may be added to cement compositions with extended life, as will be deemed appropriate by a specialist in the field. Examples of such adjuvants include, but are not limited to, weighting agents, weight-reducing adjuvants, gas-producing adjuvants, mechanical property-improving adjuvants, lost-circulation materials, Examples of such adjuvants, and others, include salts, fibers, hydratable clays, microspheres, diatomaceous earths, resins, foamers, thixotropic adjuvants, and combinations thereof. latex, their combinations and similar adjuvants. Other optional adjuvants may also be included, which include, but are not limited to, cement kiln dust, lime kiln dust, fly ash, slag cement, shale, zeolite, metakaolin, pumice, perlite, lime, silica, rice husk ash, small particle size cement, combinations thereof and similar adjuvants. With the benefit of this description, one skilled in the art will be able to determine the type and amount of adjuvant useful for a particular application and for the desired result.
    The weighting agents are typically denser materials than water and can be used to increase the density of cement compositions with extended life. For example, the weighting agents may have a specific gravity of about 2 or more (e.g., about 2, about 4, etc.). Examples of weighting agents that may be used include, but are not limited to, hematite, hausmannite and barite, and combinations thereof. Specific examples of suitable weighting agents include a HI-DENSE® weighting agent, available from Halliburton Energy Services, Inc.
    Weight-reducing adjuvants may be part of the extended-life cement compositions for, for example, reducing the density of the extended-life cement compositions. Examples of weight reduction adjuvants include, but are not limited to, bentonite, coal, diatomaceous earth, expanded perlite, fly ash, gilsonite, hollow microspheres, low density elastic beads nitrogen, pozzolan-bentonite, sodium silicate, combinations thereof or other light adjuvants known in the art.
    [0032] Gas production aids may be part of the extended life cement compositions to release gas at a predefined time, which may be beneficial to prevent gas migration from formation through the extended life cement composition before it hardens. The product gas may combine with the extended life cement composition or inhibit its gas permeation of the formation. Examples of suitable gas-producing adjuvants include, but are not limited to, metal particles (eg, aluminum powder) that react with an alkaline solution to produce a gas.
    [0033] Enhancers of mechanical properties may be included in extended life cement compositions to, for example, ensure adequate compressive strength and long-term structural integrity. These properties can be affected by fatigue, stress, temperature, pressure and impact effects of an underground environment. Examples of improvements in mechanical properties include, but are not limited to, carbon fibers, glass fibers, metal fibers, mineral fibers, silica fibers, polymeric elastomers, and latices.
    [0034] Circulation loss materials may be included in extended life cement compositions to, for example, help prevent the loss of fluid circulation in the subterranean formation. Examples of traffic loss materials include, but are not limited to, cedar bark, crushed cane stalks, mineral fiber, mica flakes, cellophane, calcium carbonate, ground rubber, polymers, pieces of plastic material, ground marble, wood, nut hulls, plastic laminates (Formica® laminate), corn cobs and cotton pods.
    [0035] Defoaming agents may be part of the extended life cement compositions to, for example, reduce the tendency of long-life cement compositions to foam during mixing and pumping of the life-time cement compositions. extended. Examples of suitable defoaming aids include, but are not limited to, silicone polyol compounds. Suitable defoaming aids are available from Halliburton Energy Services, Inc. as D-AIR ™ Defoamers.
    Foaming auxiliaries (eg foaming surfactants) may be part of the extended-life cement compositions for example to facilitate foaming and / or stabilize the resulting foam which is formed by them. . Examples of suitable defoaming aids include, but are not limited to: ammonium salt mixtures of an alkyl ether sulfate, a cocoamidopropyl betaine surfactant, a cocoamidopropyl oxide surfactant dimethylamine, sodium chloride and water; ammonium salt mixtures of an alkyl ether sulfate surfactant, an alkyl ether sulfate surfactant, a cocoamidopropyl hydroxysultaine surfactant, a surfactant of cocoamidopropyl dimethylamine oxide, sodium chloride and water; hydrolysed keratin; mixtures of a surfactant of ethoxylated alcohol ether sulfate, alkyl surfactant or alkene amidopropyl betaine and alkylene oxide dimethylamine surfactant; aqueous solutions of an alpha-olefin sulfonate surfactant and a betaine surfactant; and their combinations. An example of a suitable foaming adjunct is ZONESEALANT ™ 2000 Agent, available from Halliburton Energy Services, Inc. Houston, Texas.
    Thixotropic admixtures may be part of the extended-life cement compositions for example to produce a long-life cement composition capable of being pumped as a low viscosity fluid, but which when admitted at quiet, reaches a relatively high viscosity. Among other things, thixotropic adjuvants can be used to promote the regulation of free water, to create a rapid freeze when the composition takes, to combat the lost circulation, to prevent "relapse" in the annular column and to limit the gas migration. Examples of suitable thixotropic builders include, but are not limited to, gypsum, water-soluble carboxyalkyl, hydroxyalkyl, mixed hydroxyalkyl carboxyalkyl or cellulose, polyvalent metal salts, zirconium oxychloride with hydroxyethyl cellulose or a combination thereof.
    One skilled in the art will appreciate that extended life cement compositions generally have a density suitable for a particular application. For example, the extended life cement compositions may have a density of from about 4 pounds per gallon ("lb / gal") to about 20 Ib / gal. For example, extended life cement compositions may have a density of from about 8 lb / gal to about 17 lb / gal. Extended life cement compositions may or may not be foamable, or may contain other means of reducing their densities, such as hollow microspheres, low density elastic beads, or other density reducing aids known in the art. The density may be reduced after storage, but before placement in an underground formation. Weighting agents can be used to increase the density of the extended life cement compositions. Examples of suitable weighting agents may include barite, hematite, hausmannite, calcium carbonate, siderite, ilmenite or combinations thereof. Without limitation, the weighting agents may have a relative density greater than or equal to 3. With the benefit of this description, one skilled in the art will recognize the proper density required for a particular application.
    As already indicated, the extended-life cement compositions may have a delayed setting so as to be able to remain in a pumpable fluid state for at least one day (e.g. day, about 2 weeks, about 2 years or more) at room temperature (eg, about 80 ° F) during storage. For example, extended life cement compositions may remain in a pumpable fluid state for a period of about 1 day to about 7 days or more. In some embodiments, the extended life cement compositions may remain in a pumpable fluid state for at least about 1 day, about 7 days, about 10 days, about 20 days, about 30 days, about 40 days, about 50 days, about 60 days or more. A fluid is considered to be in a pumpable fluid state when the fluid has a consistency of less than 70 Bearden units of consistency ("Bc"), as measured on a pressurized consistometer according to the procedure for determining durations of time. cement thickening established in ΓΑΡΙ Practical RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005.
    As indicated above, when it is desired to use them, extended life cement compositions can be activated (eg by addition of a cement setting activator) to take a hardened mass. In this context, the term "active" corresponds to the activation of an extended life cement composition and in some cases may also correspond to the acceleration of setting a lifetime cement composition. extended if the mechanism of said activation also accelerates the development of the compressive strength. By way of example, a cement setting activator may be added to a long life cement composition to activate the extended life cement composition. An extended-life cement composition that has been activated can take up to form a cured mass in a time of about 1 hour to about 12 days. For example, the extended-life cement compositions may take a cured mass in any time interval and / or any value of about 1 hour, about 6 hours, or about 12 hours. hours, approximately 1 day, approximately 2 days, approximately 4 days, approximately 6 days, approximately 8 days, approximately 10 days or approximately 12 days.
    The extended life cement compositions can develop a desirable compressive strength after activation. The compressive strength is generally the ability of a material or structure to withstand axially directed thrust forces. The compressive strength may be measured at a point in time after activation of the extended life cement compositions, while the extended life cement composition is maintained under specified conditions of temperature and pressure. The compressive strength can be measured by either destructive or non-destructive methods. The destructive process physically tests the resistance of treatment fluid samples at different times by crushing the samples in a compression testing machine. The compressive strength is calculated from the failure load divided by the load-resistant cross-sectional area, and is expressed in units of pound-per-square inch (psi). Non-destructive methods may employ a UCA ™ Ultrasonic Cement Analyzer, available from the Finn Instrument Company, Houston, Texas. Resistance values can be determined according to ΓΑΡΙ RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005.
    For example, extended life cement compositions that have been activated can develop a 24 hour compressive strength in the range of about 50 psi to about 5,000 psi, if not, from about 100 psi to about 4,500 psi, or otherwise from about 500 psi to about 4,000 psi. In particular, extended life cement compositions can develop a 24 hour compressive strength of at least about 50 psi, at least about 100 psi, at least about 500 psi or more. Values of compressive strength values can be determined by destructive or non-destructive processes at any temperature, however the development of compressive strength at temperatures between 70 and 140 ° F may be This is of particular importance for potential use in underground formations with relatively low bottom-well static temperatures.
    In some examples, extended life cement compositions may have desirable thickening times. The thickening time is usually a time when a fluid, such as an extended life cement composition, remains in a fluidable state to be pumped. A number of laboratory techniques are possible for measuring the thickening time. A pressurized consistometer operated in accordance with the procedure disclosed in the above-described API RP 1OB-2 can be used to measure whether a fluid is in a pumpable fluid state. The thickening time can be the time required for the treatment fluid to reach 70 Bc and can be defined as the time required to reach 70 Bc. Without limitation, extended life cement compositions may have thickening times greater than about 1 hour, otherwise, greater than about 2 hours, greater than about 15 hours, greater than about 30 hours, greater than about 100 hours or otherwise greater than about 190 h to 3000 psi, and temperatures from about 50 ° F to about 450 ° F, otherwise, in a range of about 70 ° F to about 140 ° F, and otherwise temperature of about 100 ° F. As shown in the examples below, the thickening times can be controlled by the degree to which the pH of the extended life cement compositions increases. This is related, to some degree, to the concentration of the cement setting activator, and is a quantitative method of controlling setting time of the extended life cement compositions.
    As will be appreciated by those skilled in the art, extended life cement compositions can be used in a number of underground operations, including primary cementing and remediation. For example, an extended life cement composition may contain a calcium aluminate cement, water, a set retarder, a delayed release cement setting activator and optionally a dispersing agent. , a cement setting accelerator and / or a filler material. When desired for use, the extended life cement composition may be pumped to the bottom of the well where it may be introduced into an underground formation where it may be allowed to take. In this context, the introduction of the extended life cement composition into a subterranean formation includes introducing into any portion the subterranean formation, including without limitation into a wellbore drilled into the subterranean formation, into an area near a wellbore surrounding the wellbore, or both.
    [0045] Other applications may include the storage of cement composition with extended service life. For example, an extended life cement composition may contain a calcium aluminate cement, water, a set retarder, a delayed release cement setting activator and optionally a dispersing agent. , a cement setting accelerator and / or a filler material. The extended life cement composition may be stored in a container or other suitable container. Extended life cement compositions can then be pumped to the bottom of the well when ready for use. Extended life cement compositions can remain in storage for a desired time. For example, extended life cement compositions may remain in storage for a period of about 1 day, about 2 weeks, about 2 years or more. For example, long-life cement compositions may remain in storage for a period of about 1 day, about 2 days, about 5 days, about 7 days, about 10 days, about 20 days, about 30 days, about 40 days, about 50 days, about 60 days or up to about 2 years. When desired, extended life cement compositions may be introduced into an underground formation where they may be allowed to take up.
    In primary cementing applications, for example, extended life cement compositions may be introduced into an annulus between a pipe located in a wellbore and the walls of a wellbore (and / or or a wider pipe in the wellbore), the wellbore penetrating the subterranean formation. Extended life cement compositions can take in the annulus to form an annular sheath of hardened cement. Extended life cement compositions can form a barrier that prevents the migration of fluids into the wellbore. Extended life cement compositions can also support drilling in the wellbore, for example.
    In remediation cementing applications, extended life cement compositions can be used, for example, in cement crushing operations or in the placement of cement plugs. For example, extended life cement compositions can be introduced into a wellbore to plug an opening (eg, a void or crack) in the subterranean formation, in a gravel bed, in a in the cement sheath and / or between the pipe sheath and the pipeline (eg an annular micro-space).
    We can propose a cementing process. The method may be used in connection with at least one of the methods, compositions and / or systems illustrated in FIGS. 1-3. The method may include the use of a long-life cement composition containing a cement calcium aluminate, water, a cement setting retarder and a delayed release cement setting activator; introducing the extended life cement composition into an underground formation; and allowing the extended life cement composition to take up in the subterranean formation; the extended-life cement composition having a thickening time of at least about two hours. The cement setting retarder may be selected from the group consisting of hydroxycarboxylic acids or their respective salts, boric acid or its respective salt and combinations thereof. The cement setting retarder may be present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition. The delayed release cement setting activator may be selected from the group consisting of Group IA and IIA hydroxides, alkali aluminates, Portland cement and the like. The liberated introduction cementing activator may comprise a binder selected from the group consisting of silica gel, aluminosilicate, chitosan, cellulose, their derivatives and combinations thereof. The delayed release cement setting activator may contain an outer coating selected from the group consisting of polysaccharides, chitins, lipids, latex, wax, chitosans, proteins, aliphatic polyesters, poly (lactides), and ), poly (glycolides), poly (E-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), polyesters ethylene oxides, polyphosphazenes, their derivatives, copolymers and combinations thereof. The delayed release cement setting activator may be present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition. The extended life cement composition may further contain at least one dispersant selected from the group consisting of a sulfonated formaldehyde dispersant, a polycarboxyl ether dispersant and any combination thereof; the dispersant being present from about 0.01% to about 5% by weight of the extended life cement composition. The extended-life cement composition may further contain at least one lithium salt selected from the group consisting of lithium sulfate, lithium carbonate and any combination thereof; the lithium salt being present at about 0.01 to about 10% by weight of the extended life cement composition. The method may further include pumping the extended life cement composition through a pipe and into a wellbore annulus that enters the subterranean formation. The method may further further comprise preserving the extended life cement composition for a period of at least about 7 days prior to introduction of the extended life cement composition.
    An extended life cement composition can be provided for cementing. The extended life cementation composition may be used in connection with at least one of the methods, compositions and / or systems illustrated in Figures 1 to 3. The extended life cement composition may contain Calcium aluminate base, water, a cement setting retarder and a delayed release cement setting activator. The cement setting retarder may be selected from the group consisting of hydroxycarboxylic acids or their respective salts, boric acid or its respective salt and combinations thereof. The cement setting retarder may be present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition. The delayed release cement setting activator may be selected from the group consisting of Group IA and IIA hydroxides, alkali aluminates, Portland cement and the like. The liberated introduction cementing activator may comprise a binder selected from the group consisting of silica gel, aluminosilicate, chitosan, cellulose, their derivatives and combinations thereof. The delayed release cement setting activator may contain an outer coating selected from the group consisting of polysaccharides, chitins, lipids, latex, wax, chitosans, proteins, aliphatic polyesters, poly (lactides), and poly (glycolides), poly (ca-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), poly (oxides) ethylene), polyphosphazenes, their derivatives, copolymers and combinations thereof. The delayed release cement setting activator may be present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition. The extended life cement composition may further contain at least one dispersant selected from the group consisting of a sulfonated formaldehyde dispersant, a polycarboxyl ether dispersant and any combination thereof; the dispersant being present from about 0.01% to about 5% by weight of the extended life cement composition. The extended-life cement composition may further contain at least one lithium salt selected from the group consisting of lithium sulfate, lithium carbonate and any combination thereof; the lithium salt being present at about 0.01 to about 10% by weight of the extended life cement composition.
    A cementing system can be provided. The system may be used in connection with at least one of the methods, compositions, and / or systems illustrated in FIGS. 1-3. The system may contain an extended life cement composition containing: an aluminate cement calcium, water, a cement setting retarder and a delayed release cement setting activator; mixing equipment capable of mixing the extended life cement composition; pumping equipment is capable of pumping the extended life cement composition through a pipe and into a wellbore annulus which enters the subterranean formation. The system may further include a vessel capable of retaining the extended life cement composition. The cement setting retarder may be selected from the group consisting of hydroxycarboxylic acids or their respective salts, boric acid or its respective salt and combinations thereof. The cement setting retarder may be present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition. The delayed release cement setting activator may be selected from the group consisting of Group IA and IIA hydroxides, alkali aluminates, Portland cement and the like. The liberated introduction cementing activator may comprise a binder selected from the group consisting of silica gel, aluminosilicate, chitosan, cellulose, their derivatives and combinations thereof. The delayed release cement setting activator may contain an outer coating selected from the group consisting of polysaccharides, chitins, lipids, latex, wax, chitosans, proteins, aliphatic polyesters, poly (lactides), and ), poly (glycolides), poly (ε-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), polyesters ethylene oxides, polyphosphazenes, their derivatives, copolymers and combinations thereof. The delayed release cement setting activator may be present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition. The extended life cement composition may further contain at least one dispersant selected from the group consisting of a sulfonated formaldehyde dispersant, a polycarboxyl ether dispersant and any combination thereof; the dispersant being present from about 0.01% to about 5% by weight of the extended life cement composition. The extended-life cement composition may further contain at least one lithium salt selected from the group consisting of lithium sulfate, lithium carbonate and any combination thereof; the lithium salt being present at about 0.01 to about 10% by weight of the extended life cement composition.
    Referring now to Figure 1, will now be described the preparation of a cement composition with extended life. Figure 1 illustrates a system 2 for preparing an extended life cement composition and the subsequent introduction of the composition into a wellbore. As can be seen, the extended life cement composition can be mixed in the mixing equipment 4, such as a jet mixer, a recirculating mixer or a batch mixer, for example, and then pumped by the pumping equipment 6 to the wellbore. The mixing equipment 4 and the pumping equipment 6 may be arranged on at least one mixer truck, as will be apparent to those skilled in the art. A delayed release cement setting activator may be added to the mixing equipment 4, or it may be added to the pumping equipment 6. The delayed release cement setting activator may be dry blended with the extended life cement composition if desired. Alternatively, a delayed release cement setting activator may be added to a long life cement composition after the extended life cement composition has been pumped into the wellbore. When a delayed release cement setting activator is added to the mixing equipment, a jet mixer may be used, for example, to continuously mix the cement setting activator and the lifetime cement composition. extended while being pumped into the wellbore. Alternatively, a recirculating mixer and / or a batch mixer can be used to mix the extended-life cement composition and the delayed-release cement-enabler, and the Delayed introduction can be added to the mixer, in powder form, prior to pumping the extended life cement composition to the bottom of the well. In addition, batch type units may be connected to a separate tank containing delayed release cement setting activator. The delayed release cement setting activator can then be introduced in-line with the extended life cement composition while being pumped out of the mixing unit. A process is required to prepare or mix the extended life cement compositions, and a specialist must be readily capable of preparing, mixing and pumping the extended life cement compositions with their expertise.
    An example of a technique for placing an extended life cement compositions in an underground formation with reference to FIGS. 2 and 3 will now be described. FIG. 2 illustrates a surface equipment 10 which can be used to placing an extended life cement composition according to some embodiments. It should be noted that while Figure 2 generally illustrates a terrestrial operation, those skilled in the art will readily recognize that the principles described herein are equally applicable to subsea operations that utilize floating platforms and facilities or on the ground. seabed, without departing from the scope of this description. As illustrated in Figure 2, the surface equipment 10 may contain a cementing unit 12, which may contain at least one mixer truck. The cementing unit 12 may contain the mixing equipment 4 and the pumping equipment 6 shown in FIG. 1 which is represented by the system 2 on the cementing unit 12, as will be apparent to those skilled in the art. The cementation unit 12 can pump an extended life cement composition 14 through a feed line 16 and to a cementation head 18 which conducts the extended life cement composition 14 to the bottom of the well.
    Referring now to FIG. 3, the placement of the extended life cement composition 14 in a subterranean formation 20 will now be described. As illustrated, a wellbore 22 may be drilled in the subterranean formation 20. While the wellbore 22 is illustrated extending generally vertically in the subterranean formation 20, the principles described herein are also applicable to boreholes that extend at an angle through the subterranean formation 20, such as horizontal and inclined boreholes. As illustrated, the wellbore 22 contains walls 24. As illustrated, a surface casing 26 has been introduced into the wellbore 22. The surface casing 26 can be cemented to the walls 24 of the wellbore 22 by a sheath. of cement 28. At least one additional pipe (eg intermediate casing, production casing, liners, etc.), shown here as casing 30, may also be disposed at the wellbore 22. As illustrated, there is an annular space 32 formed between the casing 30 and the walls 24 of the wellbore 22 and / or the surface casing 26. At least one centralizer 34 may be attached to the casing 30, for example, to center the casing 30 in the wellbore 22 before and during the cementing operation.
    [0054] Referring again to FIG. 3, the extended life cement composition 14 may be pumped into the casing 30. The extended life cement composition 14 may flow downwardly inside the casing 30 through the casing shoe 42 at the bottom of the casing 30 and upwardly around the casing 30 in the annulus 32 of the wellbore. The extended life cement composition 14 can take in the annulus for 32 wellbore, for example to form a cement sheath that supports and positions the casing 30 in the wellbore 22. Alternatively use other techniques used for the introduction of the extended life cement composition 14, even if they are not illustrated. For example, reverse circulation techniques can be used which include introducing the extended life cement composition 14 into the subterranean formation 20 through the wellbore annulus 32 instead of through the casing 30.
    As introduced, the extended-life cement composition 14 may move other fluids 36, such as drilling fluids and / or spacing fluids that may be within the casing 30, and or the annular space 32 of the wellbore. At least a portion of the displaced fluids 36 may exit the annulus 32 of the wellbore through a line of conduit 38 and be deposited, for example, in at least one holding tank 40 (eg, a settling basin). as shown in FIG. 2. Referring again to FIG. 3, it can be seen that a bottom plug 44 can be introduced into the wellbore 22 at the top of the extended life cement composition 14, for example, to separate the extended-life cement composition 14 from the fluids 36 likely to be in the casing 30 prior to cementation. When the bottom plug 44 reaches the delivery collar 46, a diaphragm or other suitable device must break to allow the extended life cement composition 14 to flow through the plug 44. In FIG. Lower plug 44 appears on the delivery collar 46. As illustrated, an upper plug 48 can be introduced into the wellbore 22 behind the extended life cement composition 14. The upper plug 48 can separate the cement composition from the extended life 14 of a displacement fluid 50 and also pushing the extended life cement composition 14 to flow through the bottom plug 44.
    The examples of extended life cement compositions described herein may directly or indirectly affect at least one component or at least one piece of equipment associated with preparation, introduction, recovery, recycling. , reuse and / or disposal of cement compositions with extended life. For example, extended life cement compositions may directly or indirectly affect at least one mixer, related blending equipment, settling ponds, storage facilities or units, composition separators, Heat, sensors, gauges, pumps, compressors and similar apparatus used produce, store, follow, regulate and / or recondition examples of extended life cement compositions. Extended life cement compositions may also directly or indirectly affect any transport or delivery equipment used to transport extended life cement compositions to a well site or well bottom such as, for example, vessels, lines, pipelines, trolleys, tubes and / or pipes used to move the extended life cement composition composition from one location to another, pumps, compressors or engines (eg (eg upper side or downhole) used to put the extended life cement compositions in motion, any valves or related joints used to regulate the pressure or flow rate of the extended life cement compositions, and any sensor (ie, pressure and temperature), gauges and / or combinations thereof, etc. The extended life cement compositions described may also directly or indirectly affect the various downhole equipment and tools that may come into contact with the extended life cement compositions such as, but not limited to, casing. wellbore, a wellbore liner, a completion train, stringer trains, a drill string, a coiled casing, a smooth cable, a cable line, a drill pipe, drill collars, sludge engines, downhole motors and / or pumps, cement pumps, surface mounted motors and / or pumps, centering devices, turbolizers, scrapers, floats (eg hooves, collars, valves, etc.), logging tools and related telemetry equipment, actuators (eg electromechanical devices, hydromechanical devices, etc.), sliding sleeves, sheaths, production, plugs, sieves, filters, flow control devices (e.g. flow control devices, autonomous flow control devices, outflow control devices, etc.), couplings (eg electro-hydraulic wet coupling, dry coupling, inductive coupler, etc.), control lines (eg electrical, fiber optic, hydraulic, etc.), monitoring lines, drill bits and reamers, distributed sensors or sensors, downhole heat exchangers, valves and corresponding activation devices, tool seals, gaskets, cement plugs, temporary plugs and other devices or wellbore insulation components, and equipment.
    EXAMPLES
    To facilitate a better understanding of the present claims, the following examples of certain aspects of the description are given. The following examples should in no way limit or define the overall scope of the claims.
    Example 1 A sample of a calcium aluminate cementitious composition which contains about 40% to about 70% calcium aluminate by weight, about 33% to about 200% water by weight, is obtained. from about 0.01% to about 10% cement setting retarder by weight and from about 0.01% to about 5% dispersant by weight. Among the examples, the term "by weight" or "by weight" corresponds to the weight of the cement composition with extended life. The extended life cement composition is obtained from Kemeos, Inc., Chesapeake, Virginia; in the form of a delayed calcium aluminate system containing a suspension of calcium aluminate cement containing 40 to 70% solids. The calculated density of the extended life cement composition is 14.68 lb / gal.
    The sample is divided into five identical samples and four of these samples are activated by addition of 4M NaOH solution (aq). The thickening times of the four experimental samples and the control sample are measured on a high pressure and high temperature consistometer by raising ambient temperature (eg, about 70 ° F for this example) and ambient pressure to 100 ° F and 3000 psi in 15 minutes according to the determination procedure cement thickening times established in ΓΑΡΙ Practical RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005. The thickening time is the time required for the process fluid to reach 70 Bc and can be defined as the time required to reach 70 Bc. The pH of each sample is further measured after activation of each sample. The results of this test are shown in Table 1.
    Table l
    Measurements of the thickening time of cement composition with extended service life
    It is noted that one can have control over thickening times by varying the concentration of the cement setting activator. The results indicate a dependence on the activator concentration and the pH of the activated extended life cement composition.
    The foregoing description describes several embodiments of the systems and methods of use described herein that may contain different process steps and other combinations of components. It should be understood that, although individual embodiments can be presented here, the present disclosure covers all combinations of the described embodiments, including, without limitation, the various combinations of components, process step combinations and the properties of the system. It will be understood that the compositions and methods are described in terms of "comprising", "containing" or "including" various components or steps, the compositions and methods may also "consist essentially of" or "consist of" various components and steps. In addition, the indefinite articles "a" or "an" as used in the claims are defined herein to mean one or more of the element they introduce.
    For the sake of brevity, only certain intervals are explicitly described here. However, intervals from any lower limit may be combined with any upper limit to cover an interval not explicitly indicated, and intervals from any lower limit may be combined with any other lower limit to cover a non-explicitly indicated range of similarly, intervals from any upper limit may be combined with any other upper limit to indicate an interval not explicitly stated. In addition, whenever a numerical range with a lower bound and an upper bound is specified, any inclusive number or range within the range is specifically included. In particular, each range of values (of the form, "from about a to about b" or, equivalently, "from about a to b", or, equivalently, "from about ab") indicated here should be understood as describing each number and interval within the widest range of values if it is not explicitly stated. Thus, each individual point or value may serve its own lower or upper limit combined with any other point or individual value or other lower or upper limit to indicate an interval not explicitly stated.
    Therefore, the present embodiments are well adapted to achieve the objectives and advantages mentioned and also those that are inherent in the present invention. The particular embodiments described above are illustrative only, since the present invention may be modified and practiced in different but equivalent ways which will be apparent to those skilled in the art who benefit from the teachings of the invention. Although only individual embodiments are described, the invention covers any combination of all embodiments. In addition, no limitation is provided to the construction or design details described herein, other than those described in the claims below. In addition, the terms in the claims have their clear and ordinary meaning, except in the case of explicit and clear indication other defined by the applicant. It is therefore obvious that the particular illustrative embodiments described above may be altered or modified, and all such variations are considered to be within the scope and spirit of these embodiments. In the event of a conflict in the use of a word or term in this description and in at least one patent or other document that may be referred to herein, the definitions that are consistent with that description must be adopted.
    权利要求:
    Claims (20)
    [1" id="c-fr-0001]
    A cementing method comprising: using a long life cement composition containing calcium aluminate cement, water, a cement setting retarder and a cement setting activator delayed introduction; introducing the extended life cement composition into an underground formation; and allowing the extended life cement composition into the subterranean formation; the extended-life cement composition having a thickening time of at least about two hours.
    [2" id="c-fr-0002]
    The method of claim 1, wherein the cement setting retarder may be selected from the group consisting of hydroxycarboxylic acids or their respective salts, boric acid or its respective salt and combinations thereof.
    [3" id="c-fr-0003]
    The method of claim 1, wherein the cement set retarder is present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition.
    [4" id="c-fr-0004]
    The method of claim 1, wherein the delayed release cement setting activator is selected from the group consisting of Group IA and IIA hydroxides, alkali aluminates, Portland cement and the like.
    [5" id="c-fr-0005]
    The process according to claim 1, wherein the release introducing cement activator comprises a binder selected from the group consisting of silica gel, aluminosilicate, chitosan, cellulose, their derivatives and of their combinations.
    [6" id="c-fr-0006]
    The process according to claim 1, wherein the delayed release cement setting activator comprises an outer coating selected from the group consisting of polysaccharides, chitins, lipids, latex, wax, chitosans, proteins aliphatic polyesters, poly (lactides), poly (glycolides), poly (ε-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), poly (ethylene oxides), polyphosphazenes, their derivatives, copolymers and combinations thereof.
    [7" id="c-fr-0007]
    The method of claim 1, wherein the delayed release cement setting activator is present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition.
    [8" id="c-fr-0008]
    The method of claim 1, wherein the extended life cement composition further comprises at least one dispersant selected from the group consisting of a sulfonated formaldehyde dispersant, a polycarboxyl ether dispersant and any combination of these; the dispersant being present from about 0.01% to about 5% by weight of the extended life cement composition.
    [9" id="c-fr-0009]
    The process according to claim 1, wherein the extended-life cement composition further comprises at least one lithium salt selected from the group consisting of lithium sulfate, lithium carbonate and any combination thereof. this ; the lithium salt being present from about 0.01% to about 10% by weight of the extended life cement composition.
    [10" id="c-fr-0010]
    The method of claim 1, further comprising pumping the extended life cement composition through a pipe and into a wellbore annulus that enters the subterranean formation.
    [11" id="c-fr-0011]
    The method of claim 1, further comprising preserving the extended life cement composition for a period of at least about 7 days prior to introducing the extended life cement composition.
    [12" id="c-fr-0012]
    12. Extended life cement composition containing: calcium aluminate cement, water, cement setting retarder and delayed release cement setting retarder.
    [13" id="c-fr-0013]
    The composition of claim 12, wherein the cement set retarder is selected from the group consisting of hydroxycarboxylic acids or their respective salts, boric acid or its respective salt and any combination thereof; the cement setting retarder being present from about 0.01% to about 10% by weight of the extended life cement composition.
    [14" id="c-fr-0014]
    The composition of claim 12, wherein the delayed release cement setting activator is selected from the group consisting of Group IA and IIA hydroxides, alkali aluminates, Portland cement and combinations thereof.
    [15" id="c-fr-0015]
    The composition of claim 12, wherein the release introduction cementing activator comprises a binder selected from the group consisting of silica gel, aluminosilicate, chitosan, cellulose, their derivatives and of their combinations.
    [16" id="c-fr-0016]
    The composition of claim 12, wherein the delayed release cement setting activator comprises an outer coating selected from the group consisting of polysaccharides, chitins, lipids, latex, wax, chitosans, proteins, and the like. aliphatic polyesters, poly (lactides), poly (glycolides), poly (ε-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), poly (ethylene oxides), polyphosphazenes, their derivatives, copolymers and combinations thereof.
    [17" id="c-fr-0017]
    The composition of claim 12, wherein the delayed release cement setting activator is present in an amount of from about 0.01% to about 10% by weight of the extended life cement composition.
    [18" id="c-fr-0018]
    An underground formation cementation system, comprising: an extended life cement composition containing: calcium aluminate cement, water, cement setting retarder and cement setting activator delayed introduction; mixing equipment capable of mixing the extended life cement composition; pumping equipment capable of pumping the extended life cement composition through a pipe and into a wellbore annulus penetrating the subterranean formation.
    [19" id="c-fr-0019]
    The system of claim 18, further comprising a vessel capable of retaining the extended life cement composition.
    [20" id="c-fr-0020]
    The system of claim 18, wherein the delayed release cement setting activator comprises a binder selected from the group consisting of silica gel, aluminosilicate, chitosan, cellulose, their derivatives and their combinations; the delayed-release cement setting activator further comprising an outer coating selected from the group consisting of polysaccharides, chitins, lipids, latex, wax, chitosans, proteins, aliphatic polyesters, polyesters (lactides), poly (glycolides), poly (ε-caprolactones), poly (hydroxybutyrates), poly (anhydrides), aliphatic polycarbonates, orthoesters, poly (orthoesters), poly (amino acids), poly (ethylene oxides), polyphosphazenes, their derivatives, copolymers and combinations thereof.
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    同族专利:
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    法律状态:
    2017-04-12| PLFP| Fee payment|Year of fee payment: 2 |
    2018-04-25| PLFP| Fee payment|Year of fee payment: 3 |
    2020-03-13| ST| Notification of lapse|Effective date: 20200206 |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/US2015/039603|WO2017007473A1|2015-07-08|2015-07-08|Controlled activation of extended-life cement compositions|
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