METHOD OF REMOVING A WELL BACKGROUND SET, METHOD OF DEPRODUCING AN ELECTRIC POTENTIAL AND WELL BACKG

专利摘要:
Patent of Invention: "METHOD OF CONTROL OF CORROSION RATE IN WELL BACKGROUND ARTICLE AND WELL BACKGROUND ARTICLE THAT CONTROLS CORROSION RATE" .The present invention relates to a method of removing a downhole assembly , which comprises putting in contact, in the presence of an electrolyte, a first article which comprises a first material and which acts as an anode, and a second article which comprises a second material which has a lower reactivity than the first material and acts as a cathode, in which the well-bottom assembly comprises the first article in electrical contact with the second article, in which at least a part of the first article is corroded in the electrolyte.
公开号:BR112014002348B1
申请号:R112014002348-4
申请日:2012-07-30
公开日:2021-02-23
发明作者:Oleg A. Mazyar；Michael Johnson；Sean Gaudette
申请人:Baker Hughes Incorporated；
IPC主号:

专利说明:

CROSS REFERENCE TO RELATED PATENT APPLICATIONS
[0001] The present patent application claims the benefit of U.S. Patent Application No. 13/204359, filed on August 5, 2011, which is hereby incorporated by reference in its entirety. BACKGROUND
[0002] Certain downhole operations involve placing the elements in a downhole environment, where the element performs its function, and is then removed. For example, elements such as ball sets / ball seats and fracture plugs (frac) are downhole elements used to seal the lower areas in a well hole in order to perform a hydraulic fracture process (also known as in the state of the art as "weakening") to break up different areas of the reservoir rock. After the cracking operation, the balls / ball seat or plugs are then removed to allow fluid flow and or to the fractured rock.
[0003] Balls and / or ball seats, and plugs, can be formed of a corrosive material so that they do not need to be physically removed intact from the downhole environment. In this way, when the operation involving the balls / the ball seat or the fracture plug is completed, the ball, the ball seat and / or the fracture plug are dissolved. Or else the downhole article may have to remain in the hole for a longer period than is necessary for the operation.
[0004] To facilitate removal, such elements may be formed of a material that reacts with the downhole environment so that they do not need to be physically removed, for example, by mechanical operation, but are preferably corroded or dissolved under rock bottom conditions. However, when the corrosion rates, for example, of an alloy used to prepare such a corrosive article can be controlled by adjusting the composition of the alloy, an alternative way of controlling the corrosion rate of a downhole article is desirable. SUMMARY
[0005] The above and other deficiencies of the prior art are overcome, in one modality, by a method of removing a downhole set, which includes the placement, in the presence of an electrolyte, of a first article that includes a first material and acts as an anode, in contact with a second article that includes a second material that has a lower reactivity than the first material and acts as a cathode, in which the downhole assembly includes the first article in electrical contact with the second article, in which at least a part of the first article is corroded in the electrolyte.
[0006] In another embodiment, a method of producing an electrical potential in a downhole assembly includes the placement, with an electrolyte, of a first article, in which the first article includes a first material and acts as an anode , and a second article, in which the second article includes a second material that has a lower reactivity than the material of the first article and acts as a cathode, in contact with a conductive element to form a circuit.
[0007] In another embodiment, a downhole assembly includes a first article that includes a first material and acts as an anode, and a second article that includes a second material that has a lower reactivity than the first material and acts as a cathode, in which the first and second articles are electrically connected by a conductive element to form a circuit, in which in the presence of an electrolyte, the downhole assembly produces an electrical potential, and at least part of the first article is corroded. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Referring now to the drawings in which the identical elements are numbered identically in the various figures: Figure 1A shows a cross-sectional view of a downhole assembly 100a with a sphere 120 made of a first corrosible metal, and a seat 110 having a seat portion 111 made of a second metal; Figures 1B and 1C show a cross-sectional view of a downhole assembly (100b, 100c) with a ball 120 and a seat 111m that changes from a first position 110b to a second position 110c to place the seat 111m in contact with an insert 114 made of a second metal to initiate corrosion; Figure 2 shows a cross-sectional view of a downhole assembly 200 with a ball 220 with a core 221 made of a first corrodible metal, a liner 222, and a seat 210 that has a seat part 211 made of a second metal, in which a connection connection B electrically connects the ball 220 and the seat 210; Figure 3A shows a cross-sectional view of a downhole assembly 300 with a sphere 320 with an axial core 321 of a first metal surrounded by an outer core 322, a seat 310 having a seat part 311 made of a second metal; and Figure 3B shows a cross-sectional view of a downhole assembly 300a after removal of the axial core 321 in Figure 3A, with a ball 320a with a channel 321a surrounded by an outer core 322, and a seat 310 that has a seat part 311 made of a second metal. DETAILED DESCRIPTION OF THE INVENTION
[0009] Here is presented a method of controlling the corrosion of a downhole article. The downhole device includes a set of two subunits, a first subunit prepared from a first material, and a second subunit prepared from a second material, where the first material has a higher galvanic activity (i.e. , it is more reactive) than the second material. Each of the first and second materials can be, for example, a different metal from the galvanic series. The first and second materials come into contact with each other in the presence of an electrolyte, such as, for example, brine. The first subunit is, for example, a sphere, made of a corrosive, highly reactive metal such as magnesium, which is anodic, and the second subunit is, for example, a ball seat made of a non-corrosive, reactive metal relatively low (compared to the highly reactive metal used to form the sphere) such as nickel, iron, cobalt, etc., which is cathodic. Alternatively, in one embodiment, the first subunit is, for example, a ball seat, and the second subunit is a ball. In one embodiment, with the selection of the material activities of the two subunits to have a greater or lesser difference in the corrosion potentials, the highly reactive material corrodes at a faster or slower rate, respectively.
[00010] To initiate galvanic corrosion, electrical coupling of the anodic high reactivity metal and the cathodic low reactivity metal is required, and an electrolyte is also present and immediately comes into contact with the anode and cathode. In one embodiment, the electrical coupling of these subunits initiates galvanic corrosion. Where the highest reactivity component (for example, the sphere) is covered with a coating of a highly reactive metal oxidation product (such as Mg (OH) 2 where the high reactivity metal is magnesium or an alloy of same), an electric potential of direct current can be applied to (or be generated by) anodic and cathodic subunits through the electrical connection, to initiate corrosion of the subunit made of the highly reactive metal (for example, the sphere). The direct current source can be, for example, a battery placed at the bottom of the well or on the surface, and electrically connected to the article.
[00011] On the other hand, when these dissimilar metals are placed in electrical contact in the presence of an electrolyte, an electrochemical potential is generated between the metal subunit of high anodic reactivity (that is, the sphere in the example above) and the subunit of metal with low cathodic reactivity (for example, a ball seat). The greater the difference in corrosion potential between dissimilar metals, the greater the electrical potential generated. In such an arrangement, the cathodic subunit is protected against corrosion by the anodic subunit, where the anodic subunit is corroded as a sacrificial anode. Corrosion of metal subunits in brines and other electrolytes can be reduced by coupling them to more active metals. For example, a steel article electrically coupled to a magnesium article in the presence of brine is less susceptible to corrosion than a steel article without electrical contact with a magnesium article.
[00012] The electrical coupling of the anodic sphere and the cathodic sphere seat with an electrolyte also produces a useful electrical potential for driving a downhole device, such as, for example, a downhole detection or signaling device .
[00013] A method of removing a downhole assembly thus includes placing, in the presence of an electrolyte, a first article comprising a first material and acting as an anode, in contact with a second article comprising a second material that has a lower reactivity than the material of the first article and acts as a cathode, in which the downhole assembly includes the first article in electrical contact with the second article, in which at least a part of the first article is corroded in the electrolyte.
[00014] The first material includes any material suitable for use in a downhole environment, since the first material is corrosive in the downhole environment compared to a second material that has a different reactivity. In one embodiment, the first material comprises a magnesium alloy. Magnesium alloys include an alloy that is corrosive in a corrosive environment that includes what is typically found at the bottom of the well, such as an aqueous environment that includes salt (ie, brine), or an acidic or corrosive agent such as hydrogen sulfide, hydrochloric acid, or other such corrosive agents. Suitable magnesium alloys for use include magnesium alloys with aluminum (Al), cadmium (Cd), calcium (Ca), cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), nickel ( Ni), silicon (Si), silver (Ag), strontium (Sr), thorium (Th), zinc (Zn), zirconium (Zr), or a combination comprising at least one of these elements. Particularly useful alloys include magnesium alloy particles which include those prepared from magnesium combined with Ni, W, Co, Cu, Fe, or other metals. Alloy or trace elements can be included in varying amounts to adjust the corrosion rate of magnesium. For example, four of these elements (cadmium, calcium, silver and zinc) have mild to moderate acceleration effects on corrosion rates, while four others (copper, cobalt, iron and nickel) have an even greater acceleration effect on corrosion. . Exemplary commercially available magnesium alloys that include different combinations of the above alloying elements to achieve different degrees of corrosion resistance include, but are not limited to, for example, those combined with aluminum, strontium and manganese, such as AJ62, AJ50x, AJ51x and AJ52x alloys, and those combined with aluminum, zinc and manganese that include AZ91A-E alloys.
[00015] It should be appreciated that alloys that have higher corrosion rates than those of the exemplary alloys above are contemplated as being useful in this case. For example, nickel has been found to decrease the corrosion resistance (i.e., increase the corrosion rate) of magnesium alloys when included in amounts less than or equal to about 0.5% by weight, specifically smaller than or equal to about 0.4% by weight, and more specifically less than or equal to about 0.3% by weight, to obtain a useful corrosion rate for the downhole corrodible article.
[00016] The magnesium alloys above are useful for forming the first article, and are formed in the desired shape and size through casting, forging and machining. Alternatively, magnesium powders or magnesium alloy are useful for forming the first article. The magnesium alloy powder generally has a particle size of about 50 to about 250 micrometers (μm), and more specifically about 60 to about 140 μm. The powder is further coated when using a method such as chemical vapor deposition, anodizing or the like, or mixed by the physical method such as cryo-milling, ball milling, or the like, with a metal or oxide of metal such as Al, Ni, W, Co, Cu, Fe, oxides of one of these metals, or something like that. Such coated magnesium powders are indicated here as controlled electrolytic materials (EMC). The EMCs are then molded or compressed into the desired shape, for example, by cold compression using an isostatic press at about 40 to about 80 ksi (about 275 to about 550 MPa), followed by extrusion, forging or sintering , or machining, to obtain a core that has the desired shape and dimensions.
[00017] It should be understood that the magnesium alloy or the EMC will therefore have any corrosion rate necessary to achieve the desired performance of the article. In a specific embodiment, the magnesium alloy or EMC used to form the core has a corrosion rate of about 0.1 to about 150 mg / cm2 / h, specifically from about 1 to about 15% by weight when using 3 mg / cm2 / h of 200 ° F (93 ° C) aqueous KCl.
[00018] The first article optionally has a non-metallic coating on a surface of the first article. The coating includes a soluble glass, a soluble polymer, or a metal oxide or hydroxide coating (including an anodized coating). In one embodiment, the non-metallic coating is a product of the oxidation of the metal of the first article, in particular where the first article comprises an active metal (in relation to the second article). For example, where the first article comprises the magnesium alloy, the non-metallic coating can be magnesium hydroxide formed by an anodic process. Alternatively, a carbide oxide coating such as aluminum oxide can be applied to the surface of the first article by a deposition process.
[00019] The non-metallic coating is removed by ambient conditions at the bottom of the well, or by the application of an electrical potential. For example, where the coating is a soluble material such as glass or polymer, the coating dissolves in the wells' ambient fluids, such as water, brine, distillates, or the like, to expose the first underlying material. Alternatively, where a metal oxide or hydroxide is used, an electrical contact can be established between the first and second articles, and the electrical potential applied to perform electrolysis on the coating and to induce corrosion.
[00020] The second material is, in one modality, any metal that has a lower reactivity than the first material, based, for example, on the galvanic series of salt water. The second material is also resistant to corrosion by a corrosive material. As used herein, "resistant" means that the second material is not etched or corroded by any corrosive rock bottom conditions encountered (ie, brine, hydrogen sulfide, etc., at pressures higher than atmospheric pressure, and at temperatures above 50 ° C).
[00021] By selecting the reactivity of the first and second materials so that they have a greater or lesser difference in their corrosion potentials, the highly reactive material (for example, highly reactive metal) corrodes at a faster or faster rate slow, respectively. In general, for metals in the galvanic series, the order of metals, from the most noble (that is, the least active and most cathodic) to the least noble (that is, the most active and the most anodic) includes, for example, steel, tungsten, chromium, nickel, cobalt, copper, iron, aluminum, zinc and magnesium. The second material includes steel, tungsten, chromium, nickel, copper, iron, aluminum, zinc, alloys thereof, or a combination comprising at least one of the above elements, where the first material is magnesium or an alloy of it. In a specific embodiment, the first material is a magnesium alloy, and the second material is steel, nickel, cobalt or copper.
[00022] In one embodiment, the second article is made entirely of the second material, or the second article includes a layer of the second material. Here, a layer includes a single layer, or multiple layers of the same or different materials. Where the layers are used, the underlying material is a metal, ceramic, or the like, and in one embodiment it is manufactured, for example, from the first material in such a way that it is separated from the first material in the first article by (s) layer (s) of the second material.
[00023] The first article and the second article are not limited to any particular form or function. In one embodiment, the first and second items are used together in a fitted set. For example, in one embodiment, the first item is a CEM ball, and the second item is a ball seat. Alternatively, the first article is a EMF ball seat, and the second article is a ball. In another embodiment, the first article is a EMF fracture plug and the second article is the wrapper for the fracture plug. In one embodiment, the first article is a ball cap or EMF fracture, and the second article is the ball seat or wrapper (respectively), where this arrangement allows for greater adaptability of a system in which all articles of a variety of non-fixed items (for example, a ball) must be used with a fixed item type (such as a ball seat). Where desired, a portion of the fixed article (for example, ball seat) is shaped like a EMF coated with a (second) more noble metal such as zinc, aluminum or nickel, so that the fixed article is removed when remove the second metal coating, and the underlying EMC is corroded.
[00024] In one embodiment, the first article comprises a non-corrosive core comprising the second material and which penetrates at least partially into the first article, and a corrosive surrounding structure comprising the first material, in which only the surrounding structure is corroded. The first article is thus partially composed of the first material and the second material. For example, the first article is a sphere or an elongated structure that has one or more non-corrosive cores inserted partially into the article, or follows axially or along a string through the center or decentralized (respectively) of the sphere or structure. Any dimension of the first article can be penetrated; in one embodiment, the longest dimension is traversed by the nucleus. Thus, in one embodiment, the first article includes a low reactivity core (for example, nickel) that partially penetrates the first article, and a corrosive surrounding structure (for example, a magnesium alloy or an EMC).
[00025] In a non-limiting example, the first article is a corrosive sphere formed from a magnesium or EMC alloy, equipped with one or more nickel cores or screws inserted in it. This arrangement provides close contact with the first and second materials, where the corrosion of the first article is accelerated by placing the article at the bottom of the well and by electrically connecting one or more of the nickel screws with the magnesium alloy ball. On the other hand, the first article is a corrosive seat that has one or more non-corrosive cores that penetrate radially partially or completely (for example, screwed) to the side. The presence of these cores provides additional contact between the first and second materials, and facilitates electrical contact with a second article (for example, a sphere where the first article is a seat, or vice versa).
[00026] In another embodiment, the first article comprises a corrosive core comprising the first material and which at least partially penetrates the first article, and a non-corrosive surrounding structure comprising the second material, in which only the core is corroded. The first article thus includes a corrosive core that penetrates through a long axis or diameter of the first article, and a non-corrosive surrounding structure. The application of controlled corrosion to such first articles should then result in the corrosion of only the core, leaving a channel through the sphere. In a non-limiting example, the first article is a non-corrosive sphere made of a low reactivity material (for example, aluminum or nickel), with one or more highly reactive cores (for example, a magnesium alloy) that penetrates ( for example, screwed into or formed) therethrough.
[00027] On the other hand, the first article is the seat that has a corrosive core that penetrates (for example, screwed) radially through the side, where corrosion and removal of the corrosive core opens to the side wall and any characteristics ( for example, channels, etc.) underlying below. In this way, the ball (or the seat) is used to allow partial flow. In other embodiments, the core comprises more than one metal in successive layers, each of which has a different reactivity. This arrangement can be used to selectively increase the flow, such as when forming the first article of concentric layers of increasingly noble metals (on the galvanic scale, such as layers of different magnesium alloys, which are corrosive to the surrounding structure) , which should allow for a gradual increase in the size of the channel as the additional layers are corroded.
[00028] The electrolyte includes an aqueous or non-aqueous electrolyte, depending on the application and the controllability of the ambient conditions. A non-aqueous electrolyte includes an ionic liquid, a melted salt, an ionic liquid dissolved in an oil, or a salt dissolved in a polar aprotic solvent such as ethylene carbonate, propylene carbonate, dimethyl formamide, dimethyl acetamide, gamma-butyrolactone, or other such solvents. However, where the article is a rock bottom element, the control of ambient conditions to exclude moisture is not practical and, therefore, under such conditions, the electrolyte is an aqueous electrolyte. Aqueous electrolytes include water or a salt dissolved in water, such as brine, an acid, or a combination that comprises at least one of the above elements.
[00029] In a corrosion control method in a downhole environment, corrosion of the first article by the electrolyte is carried out electrically by placing the first in contact with the second article in the presence of the electrolyte, optionally by inducing corrosion by applying a potential to the first and second articles in the presence of the electrolyte. A direct current electrical potential can thus be applied to the anode and cathode (second and first articles, respectively, where the first and second articles are electrically isolated from each other and the cell is being activated backwards) via the electrical connection , to start corrosion in the first article. The source of direct current for this process can be, for example, a movable sleeve inside the article, in which the sleeve is mechanically coupled to a power source (a battery, a magnet or a small generator that generates a current by induction) .
[00030] In another embodiment, the downhole assembly, when electrically connected to form a complete electrical circuit, produces electrical current by forming a galvanic cell in which the first and second articles (that is, the anode and the cathode, which comprise the first and second metals, respectively, where the cell is being activated forward) are electrically connected by a connection circuit in the presence of the electrolyte. The first and second articles are not in direct electrical contact with each other, but are in electrical contact through an electrolyte (ie, in common electrical contact with), or where in physical contact they are separated, for example, by an insulating material such as a Mg (OH) 2 coating or a non-conductive O-ring to prevent a cell short-circuiting. Such an arrangement is sufficient to provide power to drive a device such as, for example, a transmitter or a sensor, or another such device. Thus, a method of producing an electric potential in a downhole assembly includes contact with an electrolyte of a first article, in which the first article comprises a first metal and acts as an anode; and a second article, in which the second article comprises a second metal which has a lower reactivity than the metal of the first article and acts as a cathode. The anode and cathode are in common electrical contact with each other through a conductive element (for example, an electrical charge, such as a sensor or heater) to form a circuit.
[00031] A downhole assembly includes a first article comprising a first material, and a second article comprising a second material that has a lower reactivity than the material of the first article and acts as a cathode, in which the first and second articles are electrically connected by a conductive element (for example, an electrical charge) to form a circuit, in which, in the presence of an electrolyte, the downhole assembly produces an electrical potential, and at least one part of the first article is corroded.
[00032] Exemplary modalities other than the rock bottom set are also described in the figures.
[00033] Figure 1A shows a cross-sectional view of a downhole assembly 100a. In assembly 100a, a ball 120 made of a first corrosible metal is seated on a seat 110 which has a seat part 111 made of a second metal and contained in a housing 112. Ball 120 and seat 110 are in direct electrical contact with each other when an electrolyte is present, or where no insulating layer (such as Mg (OH) 2) or another material separates the ball 120 and the seat 110.
[00034] In another embodiment, shown in FIGS. 1B and 1C, ball 120 is seated on a moving part 111m from the seat (initial set 100b in Figure 1B). Seat 111m comprises the first metal, and is a mobile unit initially held in a first position 110b in contact with the side wall 113 which does not comprise a second metal. On the seat ball 120 on seat 111m, seat 111m is moved longitudinally through a surrounding shell 112 from the first position (110b in Figure 1B) to a second position (110c in Figure 1C) to form the displaced assembly 100c in Figure 1C , in which the seat 111m is in contact with an insert 114 formed of the second metal. In the initial assembly 100b, the insert 114 is electrically isolated from the side wall 113. In this way, the seat 111m is not corroded until it is moved into galvanic contact with the insert 114 of the second material. Also in a modality, each of sphere 120, seat 111m and insert 114 are formed from different construction materials, where each is made interchangeably from the first metal, the second metal, or a third metal that has a reactivity intermediate to that of the first and second metals.
[00035] In another embodiment, Figure 2 shows a cross-sectional view of a well-bottom assembly 200 with a ball 220 with a core 221 made of a first corrodible metal, a coating 222, and a seat 210 that has a seat part 211 made of a second metal and contained in a housing 212. In one embodiment, the coating is, for example, a product of the metal oxidation of the first corrosive metal (for example, Mg (OH) 2 where the first metal is magnesium or a magnesium alloy). It should be appreciated that, in one embodiment, the presence of the liner electrically insulates the ball 220 from seat 210, and thus the application of current by an energy source electrically connected to a connection connection (B) and which electrically connects the ball 220 and seat 210 initiates the corrosion of ball 220, when an electrolyte is present.
[00036] In another example, Figure 3A shows a cross-sectional view of a downhole assembly 300 with a sphere 320 with an axial core 321 of a first metal surrounded by an outer core 322, a seat 310 that has a part 311 of the seat made of a second metal and the housing 312. An optional connection connection B (not shown) electrically connects the ball 320 and the seat 310, and initiates corrosion of the axial core 321 by applying chain, where a insulating coating (not shown) is present, or generates a potential.
[00037] In another embodiment, the axial core 321 can be made of the first metal, while the outer core 322 can be made of the second metal, where the axial core 321 is corroded, leaving the outer core 322. Similarly, in in another embodiment, the axial core 321 can be made of the second metal, while the outer core 322 can be made of the first metal, where the outer core 322 is corroded, leaving the axial core 321. In these embodiments, the axial core 321 and the outer core 322 remain in constant electrical contact. Due to the fact that any Mg (OH) 2 coating on the first metal is incomplete, the electrolyte comes in contact with the axial and outer nuclei 321 and 322, respectively. In the modality, the part of the article made of the first most reactive metal will corrode more quickly, and the material of the part 311 of the seat, therefore, does not regulate the galvanic interaction.
[00038] It should be noted that the axial core 321 and the outer core 322 remain in constant electrical contact. Due to the fact that any Mg (OH) 2 coating on the first metal is incomplete, the electrolyte contacts the axial core 321 and the outer core 322. In this embodiment, the part of the article (for example, the sphere) made of first most active metal will corrode more quickly, and the material of the seat part 311 therefore does not affect the corrosion of the 321 or 322 axial or outer cores.
[00039] Figure 3B shows a cross-sectional view of a downhole assembly 300a similar to that of Figure 3A, but after corrosion of the first metal (where the axial core 321a comprises the first metal), with a sphere 320a that it has a channel 321a (which corresponds to the axial core 321 in Figure 3A, now removed) surrounded by an outer core 322, and a seat 310 that has a seat part 311 made of a second metal and contained in an enclosure 312. The channel 321a allows only a limited opening between the zones above and below the seated sphere, to restrict the flow of fluid between them to an intermediate level.
[00040] In another embodiment, a fracture plug of the first metal and which has a ball valve or check valve of the first metal has a plug of an additional active material, such as a reactive magnesium alloy powder which is more reactive than the first metal, placed on top of the plug. In this way, corrosion of the additional active material by contact with the less reactive valve of the frack plug / ball / check valve allows access to the ball or check valve.
[00041] Although one or more modalities have been shown and described, modifications and substitutions can be made in them without deviating from the character and scope of the invention. Therefore, it should be understood that the present invention has been described by way of illustration and not by way of limitation.
[00042] All ranges presented here are inclusive of extreme points, and the extreme points can be independently combined with each other. The suffix "(s)" as used herein lends itself to include the singular and plural of the term it modifies, thereby including at least one of that term (for example, the dye (s) includes (s) at least one dye). "Optional" or "optionally" means that the event or circumstance described subsequently may or may not occur, and that the description includes the cases in which the event occurs and the cases where it does not. As used herein, "combination" is inclusive of combinations, mixtures, alloys, reaction products, and the like. All references are hereby incorporated by reference.
[00043] The use of the terms "one" and "one" and "o / a" and similar referents in the context of the description of the invention (especially in the context of the following claims) should be interpreted as covering the singular and the plural, the unless it is indicated here in some other way or is clearly contradicted by the context. Furthermore, it should also be noted that the terms "first", "second" and others do not yet denote any order, quantity, or importance here, but are used, instead, to distinguish one element from another. The "about" modifier used in relation to a quantity is inclusive of the indicated value and has the meaning dictated by the context (for example, it includes the degree of error associated with the measurement of the particular quantity).

权利要求:
Claims (21)
[0001]
1. Method of removing a downhole assembly (100a), characterized by comprising: making contact, in the presence of an electrolyte, with a first article (120) which comprises a first material and acts as an anode, and a second article (110) comprising a second material that has a lower reactivity than the first material and acts as a cathode, in which the downhole assembly (100a) comprises the first article (120) in electrical contact with the second article ( 110), in which at least a part of the first article (120) is corroded in the electrolyte; and wherein the first material comprises a magnesium alloy that is less than or equal to about 0.5 weight percent nickel.
[0002]
2. Method according to claim 1, characterized by the fact that the first article (120) has a non-metallic coating on a surface thereof.
[0003]
Method according to claim 2, characterized in that the coating comprises a soluble glass, a soluble polymer or a metal oxide or hydroxide coating.
[0004]
4. Method according to claim 2, characterized by the fact that the non-metallic coating is magnesium hydroxide.
[0005]
5. Method, according to claim 2, characterized by the fact that the non-metallic coating is removed by the application of an electrical potential to establish the electrical contact between the first and the second articles (120, 110).
[0006]
6. Method according to claim 1, characterized by the fact that the second material comprises steel, tungsten, chromium, nickel, copper, iron, aluminum, zinc, their alloys, or a combination comprising at least one of the above elements.
[0007]
7. Method according to claim 1, characterized by the fact that the first article (120) is a sphere of controlled electrolytic material (EMC) or a fracture plug.
[0008]
8. Method according to claim 1, characterized by the fact that the second article (110) is a ball seat.
[0009]
9. Method according to claim 1, characterized by the fact that the first article (120) comprises: a corrosive core comprising the first material and at least partially penetrating the first article (120), and a non-corrosive surrounding structure which comprises the second material, in which only the core is corroded.
[0010]
10. Method according to claim 1, characterized in that the first article (120) comprises: a non-corrosive core comprising the second material and at least partially penetrating the first article (120), and a corrosive surrounding structure which comprises the first material, in which only the surrounding structure is corroded.
[0011]
11. Method according to claim 1, characterized by the fact that the electrolyte is water, brine, acid, or a combination comprising at least one of the above elements.
[0012]
12. Method according to claim 1, characterized by the fact that the first material is the second material are selected so that the first material has a corrosion rate of about 0.1 to about 150 mg / cm2 / h, when using 3% aqueous KCl at 200 ° F (93 ° C).
[0013]
13. Method according to claim 1, characterized by the fact that the magnesium alloy in the first material still comprises one or more of: Al; CD; Here; Co; Ass; Faith; Mn; Ni; Si; Ag; Mr; Th; Zn; or Zr.
[0014]
14. Method of producing an electric potential in a downhole set (100a), characterized by comprising: making contact, by means of an electrolyte, with a first article (120), in which the first article (120) comprises a first material and acts as an anode, and a second article (110), in which the second article (110) comprises a second material that has a lower reactivity than the material of the first article (120) and acts as a cathode , with a conductive element to form a circuit; wherein the first material comprises a magnesium alloy having less than or equal to about 0.5 weight percent nickel.
[0015]
15. Method according to claim 14, characterized by the fact that the electrolyte is water, brine, an acid, or a combination comprising at least one of the above elements.
[0016]
16. Method, according to claim 14, characterized by the fact that the second material comprises steel, tungsten, chromium, nickel, cobalt, copper, iron, aluminum, zinc, the alloys of these , or a combination that comprises at least one of the above elements.
[0017]
17. Method according to claim 14, characterized by the fact that it additionally comprises corrosion of the first article (120) in the electrolyte.
[0018]
18. Downhole assembly (100a), characterized by the fact that it comprises: a first article (120) that comprises a first material and acts as an anode, and a second article (110) that comprises a second material that has a lower reactivity than the first material and acts as a cathode, in which the first and second articles (120, 110) are electrically connected by a conductive element to form a circuit, in which, in the presence of an electrolyte, the whole downhole (100a) produces an electrical potential, and at least part of the first article (120) is corroded; and wherein at least a part of the first material comprises a magnesium alloy having less than or equal to about 0.5 weight percent nickel.
[0019]
19. Assembly according to claim 18, characterized by the fact that the second material comprises steel, tungsten, chromium, nickel, copper, cobalt, iron, aluminum, zinc, the alloys of these , or a combination that comprises at least one of the above elements.
[0020]
20. Assembly according to claim 18, characterized by the fact that the first article (120) is a ball, and the second article (110) is a ball seat.
[0021]
21. Method of removing a downhole assembly (100a), characterized by comprising: making contact, in the presence of an electrolyte, with a first article (120) that comprises a first material and acts as an anode, and a second article (110), which comprises a second material having a lower reactivity than the first material and acts as a cathode, in which the downhole assembly (100a) comprises the first article (120) in electrical contact with the second article (110), wherein at least a portion of the first article (120) is corroded in the electrolyte; and wherein the first article (120) has a non-metallic coating comprising magnesium hydroxide on a surface thereof.

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同族专利:

---

公开号 | 公开日

---

EP2739812A4|2015-12-16|

---

CA2841926A1|2013-02-14|

---

MY170351A|2019-07-23|

---

WO2013022635A3|2013-04-25|

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CA2841926C|2017-11-14|

---

EP2739812B1|2019-09-04|

---

US20130032357A1|2013-02-07|

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AU2012294758B2|2016-10-06|

---

AU2012294758A1|2014-01-16|

---

EP2739812A2|2014-06-11|

---

CN103732853A|2014-04-16|

---

US9057242B2|2015-06-16|

---

AP2014007411A0|2014-02-28|

---

BR112014002348A2|2017-03-14|

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WO2013022635A2|2013-02-14|

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法律状态:
2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-11-05| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-02-23| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 30/07/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US13/204,359|2011-08-05|

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