• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    selectively corrosive downhole article and method of removal. The present invention relates to a selectively corrosive downhole article which includes a movable cylindrical member (12) comprising a first section (14) and an axially spaced second section (16), the first section (14) comprising a first. material (18) having a first galvanic activity, the second section (16) comprising a second material (20) having a second galvanic activity, the first galvanic activity being greater than the second, the first section (14) being electrically isolated from the second section (16); and a fixed member (24) disposed on the cylindrical member and configured for electrical contact with the first section (14) or the second section (16), the fixed member (24) comprising an intermediate material (26) having an intermediate galvanic activity, the intermediate galvanic activity being intermediate between the first and second galvanic activity, the movable cylindrical member (12) configured for movement from a first position (28) where the first section (14) is disposed over and in electrical contact with the fixed member (24) and a second position (30) where the second section (16) is disposed over and in electrical contact with the fixed member (24).
    公开号:BR112014018566B1
    申请号:R112014018566-2
    申请日:2013-01-16
    公开日:2021-08-10
    发明作者:Oleg A. Mazyar；Michael H. Johnson
    申请人:Baker Hughes Incorporated；
    IPC主号:
    专利说明:

    CROSS REFERENCE TO RELATED ORDERS
    [001] This order claims the benefit of U.S. Order No. 13/371788, filed February 13, 2012, which is incorporated herein by reference in its entirety. BACKGROUND
    [002] Certain downhole operations involve placing elements in a downhole environment, where the element performs its function, and is then removed. For example, elements such as ball/ball seat assemblies and fracture plugs (frac) are downhole elements used to seal the lower zones in a borehole in order to perform a hydraulic fracturing process (also referred to in the technique as "fracking") to break up different zones of reservoir rock. After the fracking operation, the ball/ball seat or plugs are then removed to allow, inter alia, fluid flow to and from the fractured rock.
    [003] Balls and/or ball seats, and fracture plugs, may be formed of a corrosive material so that they need not be physically removed intact from the bottom drilling environment. In this way, when the operation involving the ball/ball seat or fracture cap is complete, the ball, ball seat and/or fracture cap is dissolved. Otherwise, the downhole article may have to remain in the hole longer than necessary for operation.
    [004] To facilitate removal, such elements can be formed from a material that reacts with the downhole environment so that they do not need to be physically removed, for example, by a mechanical operation, but instead corrode or dissolve in the downhole environment. In order to employ dissolution or corrosion to remove downhole elements, it is very desirable to develop downhole articles and methods of their use where dissolution or corrosion and removal of these elements can be selectively controlled. SUMMARY
    [005] In an exemplary embodiment, a selectively corrosive downhole article is described. The article includes a movable cylindrical element comprising a first section and an axially separated second section, the first section comprising a first material having a first galvanic activity, the second section comprising a second material having a second galvanic activity, the first galvanic activity being greater than the second galvanic activity, the first section being electrically isolated from the second section. The article also includes a fixed element disposed on the cylindrical element and configured for electrical contact with the first section or second section, the fixed element comprising an intermediate material having an intermediate galvanic activity and the second galvanic activity, the movable cylindrical element configured for movement of a first position where the first section is disposed and in electrical contact with the fixed element and a second position where the second section is disposed on and in electrical contact with the fixed element, wherein in the first position, the first section is set for selective dissolution, and where in the second position, the fixed element is set for selective dissolution.
    [006] In another exemplary embodiment, a method of removing a selectively corrosive downhole article is described. The method includes arranging at the downhole a selectively corrosive downhole article, comprising: a movable cylindrical element comprising a first section and an axially spaced second section, the first section comprising a first material having a first galvanic activity, the second section comprising a second material having a second galvanic activity, the first galvanic activity being greater than the second galvanic activity, the first section being electrically isolated from the second section; and a fixed element disposed on the cylindrical element and configured for electrical contact with the first section or second section, the fixed element comprising an intermediate material having an intermediate galvanic activity, the intermediate galvanic activity being intermediate with the first galvanic activity and the second activity galvanic, the movable cylindrical element configured for movement from a first position, where the first section is disposed over and in electrical contact with the fixed element, and a second position where the second section is disposed in and in electrical contact with the fixed element, wherein in the first position, the first section is configured for selective dissolution, and wherein in the second position, the fixed element is configured for selective dissolution. The method also includes exposing the selectively corrosive downhole article to a first downhole fluid while the movable cylindrical element is in the first position, wherein the first section is selectively dissolved. The method further includes moving the movable cylindrical element to the second position and exposing the selectively corrosive metal downhole article to a second well fluid, wherein the fixed element is selectively dissolved. BRIEF DESCRIPTION OF THE DRAWINGS
    [007] Referring now to the drawings in which like elements are evenly numbered in the various figures: Figure 1A is a cross-sectional view of an exemplary embodiment of a selectively corrosive downhole article comprising a sphere , ball seat and movable cylindrical sleeve in a first position as described herein; Figure 1B is a cross-sectional view of the exemplary embodiment of a selectively corrosive downhole article of Fig. 1A with the movable cylindrical sleeve in a second position as described herein; Figure 2A is a cross-sectional view of an exemplary embodiment of a selectively corrosive downhole article comprising a plug, plug seat and movable tubular article in a first position as described herein; Figure 2B is a cross-sectional view of an exemplary embodiment of a selectively corrosive downhole article of Figure 2A with the movable tubular article in a second position as described. I'm here; and Figure 3 is a flowchart of an exemplary embodiment of a method of removing a is a cross-sectional view of an exemplary embodiment of a selectively corrosive downhole article. DETAILED DESCRIPTION OF THE INVENTION
    [008] Referring to the figures, and particularly figures 1-3, a method 100 of removing a selectively corrosive downhole article 10 from a well 70 is described. The well 70 may be formed in a terrestrial formation 2 and may include a cement casing 4. The well may also include a casing 6, which may include a plurality of metal tubulars (tubular sections) 8. The selectively corrosive downhole article 10 may comprise any suitable downhole article, including several downhole tools or components. In one embodiment, the selectively corrosive downhole article 10 may include a selectively corrosive ball 50 and ball seat 52, such as a fracture ball and complementary ball seat, or a selectively corrosive plug 60 and plug seat 62. such as a fracture cap and complementary cap seat. The article 10 is configured for selective dissolution in a suitable well fluid 72, 74 acting as an electrolyte.
    [009] The article 10 includes a movable element, such as the movable cylindrical element 12, comprising a first section 14 and an axially separated second section 16. The first section 14 comprising a first material 18 having a first galvanic activity. The second section 16 includes a second material 20 having a second galvanic activity. The first galvanic activity is greater than the second galvanic activity, such that it has a greater tendency to corrode in a well fluid given as an electrolyte. The first section 14 is electrically insulated from the second section 16. The electrical insulation may be accomplished by any suitable electrical insulator 22. A suitable electrical insulator may include any electrically insulating material, particularly an electrically insulating polymer or ceramic, or a combination thereof.
    [0010] Article 10 also includes a fixed element 24 disposed on the movable cylindrical element 12, or the movable cylindrical element 12 may be disposed within the fixed element 24. The movable cylindrical element 12 and the fixed element 24 are both electrically conductive. Fixed element 24 is configured for electrical contact with first section 14 or second section 16, fixed element 24 comprising an intermediate material 26 having an intermediate galvanic activity, the intermediate galvanic activity being between the first galvanic activity and the second galvanic activity . The movable cylindrical element 12 is configured for movement from a first position 28 where the first section 14 is disposed in and in electrical contact with the fixed element 24 and a second position 30 where the second section 16 is disposed in and in electrical contact with the fixed element 24. In first position 28, first section 14 is configured for selective dissolution because first material 18 is more galvanically active (i.e., more reactive) than intermediate material 26. In second position, fixed element 24 is configured for selective dissolution because the intermediate material 26 is more galvanically active than the second material 20. The first material 18, the intermediate material 26 and the second material 20 may be, for example, of a metal other than the galvanic series having the relative activities described here. The first material 18, the intermediate material 26 and the second material contact each other, as described herein, in the presence of a well fluid comprising an electrolyte, such as, for example, a saline solution, acidifying fluid, slurry. perforation or similar.
    [0011] Referring to Figures 1A and 1B, the selectively corrosive article 10 may include a ball 50 and ball seat 52 comprise the intermediate material 26. In this embodiment, as long as at least one ball 50 and ball seat 52 comprises intermediate material 26, the other of ball 50 and ball seat 52 may include another electrically conductive material, which is less galvanically active than intermediate material 26. For example, ball 50 may be formed of intermediate material, and the ball seat may be formed of a less galvanically active material such that ball 50 is configured for removal as described herein. Alternatively, ball seat 52 may be formed of an intermediate material, such that ball seat 52 is configured for removal from well 70 as described herein, and ball 50 may be allowed to drop to a lower portion of well 70. In another embodiment, ball 50 and ball seat 52 may comprise intermediate material 26 and are configured for removal from well 70 as described herein.
    [0012] Referring to Figures 2A and 2B, the selectively corrosive article 10 may include a cap 60, such as a fracture cap, or a cap seat 62. In one embodiment, at least one of the cap 60 and cap seat 62 comprises intermediate material 26. In this embodiment, while at least one of cap 60 and cap seat 62 comprise intermediate material 26, the other of cap or cap seat 62 may include another electrically conductive material that is less galvanically active than the intermediate material 26. For example, the plug 60 can be formed of the intermediate material, and the plug seat 62 can be formed of a less galvanically active material, such that the plug 60 is configured for removal as described herein. Alternatively, plug seat 62 can be formed of an intermediate material, and plug 60 can be formed of a less galvanically active material, such that plug seat 62 is configured for removal from well 70 as described herein, and plug 60 may be allowed to fall into a lower portion of well 70. In another embodiment, plug 60n and plug seat 62 may comprise intermediate material 26 and are configured for removal from well 70 as described herein.
    [0013] Referring to Figures 1A and 1B, in one embodiment, the movable cylindrical element 12 may include a slideable sleeve 40 disposed within a tubular article 42 that can be moved axially upwards or downwards within the well 70. In another embodiment, the movable cylindrical element 12 can include a movable tubular article 44 that can be moved axially upwards or downwards within the well 70, as illustrated in Figures 2A and 2B. While the movable cylindrical element 12 is illustrated in figures 2A and 2B with the first section 14 hole above (closer to the surface) the second section 16 (figure 2A), such that the movable element 12 is moved above the hole (figures 1B and 2B ) according to method 100, as described here, it will be understood that the positions of the first section 14 and the second section 16 can be reversed, such that the first section 14 is downhole (further from the surface) of the second section 16 such that movable element 12 is moved downhole in accordance with method 100, as described herein and illustrated in Figures 1A and 1B.
    [0014] Referring to Figures 1A and 1B, in one embodiment, the slideable sleeve 40 includes a first section 14 having a shape, such as the shape of a cylindrical ring or hollow cylinder, which is configured to contact the lower surface of the ball seat 52 in an intimate touch contact sufficient to establish electrical contact between them for the purposes described here. The first section 14 formed from the first material 18 is secured near a lower end of an electrical insulator 22 which can have any suitable shape, such as a hollow cylindrical shape, and is slidably disposed within the center hole of the seat. ball 52 and configured to move from first position 28 (figure 1A) to second position 30 (figure 1B). The sliding sleeve 40 also includes a second section 16 having a shape, such as the shape of a hollow frusto-conical disc, which is configured for sealing engagement of the upper seating surface of the ball seat 52 in intimate, close-touch contact. sufficient sealing to establish electrical contact and sealing contact between them for the purposes described here. The second section 16 formed from the second material 20 is secured near an upper end of the electrical insulator 22. In a first position 28, the second section 16 is electrically insulated from the ball seat 52 in the presence of a first well bore 72 which is configured to act as an electrolyte, and the first section 14 is in electrical contact with the ball seat. As described here, the first material 18 is configured to be more galvanically active in the electrolyte than the intermediate material 26 of the ball seat 52, such that the ball seat is protected from corrosion at first position 28, and the first material is configured to be selectively corroded or dissolved in the first fluid 72. The first position 28 may, for example, represent the preparation and setup of a section of the well for a completion operation. First section 14 can be oriented against ball seat 52 by a guide element, such as, for example, guide spring 31. Guide spring 31 can be configured for eventual removal by a suitable well fluid, such as the second well fluid 74, or can be configured such that its presence in the well does not substantially interfere with intended well operations. Once the well has been configured, it may be desirable to perform an operation such as fracturing by inserting a ball 50 into first well fluid 72 (Figure 1A) and pressurizing a second well fluid 74 which is also configured to act as an electrolyte as shown in figure 1B. Pressurizing the second fluid 74 actuates the ball 50 in the second section 16 thereby causing the sliding sleeve 40 to slide into the second position 30 where the second section is in intimate electrical contact with the ball seat surface 52 such that the operation of well can be performed in the pressurized part of the well above the seal formed between the ball 50, the second section 16, and the ball seat 52. The first section 14 moves out of electrical contact with the ball seat 52 and ceases to provide galvanic protection produced in first position 28. In second position 30, the intermediate material of ball seat 52 and/or ball 50, for example, is more galvanically active than second material 20 of second section 16, thereby making ball seat 52 and/or ball 50 will corrode or dissolve in preparation for their eventual removal from the well. The absolute and relative galvanic activity of intermediate material 26 and second material 20 can be selected to establish a predetermined time interval for performing the desired well operation such as fracture, including a predetermined interval for removing ball seat 52 and/ or sphere 50, as described here. Since ball seat 52 is supporting ball 50 and sliding sleeve 40, it will be appreciated that their corrosion or dissolution will cause ball 50 and sliding sleeve 40 to be removed from the location shown in the well, such as falling to a bottom of the well. , just like the bottom of the well.
    [0015] The first material 18 can, for example, comprise any suitable corrosive, high-reactivity metal. In one embodiment, the first material is magnesium, which is anodic with respect to the intermediate material 26 and the second material 20. The first material 18 may include any material suitable for use in a downhole environment, as the first material material 26 is more galvanically active in the downhole environment with respect to intermediate material 26 and second material 20. In particular, first material 18 can be selected from the materials described herein for use as intermediate material 26, to the extent that the first material 18 is selected to be more galvanically active than the intermediate material 26.
    [0016] Intermediate material 26 may, for example, comprise a corrodible, intermediate-reactive metal. In one embodiment, the intermediate material 26 comprises magnesium, aluminum, manganese or zinc or an alloy thereof, or a combination comprising at least one of the foregoing. Magnesium alloys include any such alloy that is corrosive in a corrosive environment including those typically found in a downhole, such as an aqueous environment that includes salt (ie saline), or an acidic or corrosive agent such as hydrogen sulfide, hypochloric acid, or other such corrosive agents. Magnesium alloys suitable 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), torus (Th), zinc (Zn), zirconium (Zr), or a combination comprising at least one of these elements. Particularly useful alloys can be made from magnesium alloy particles including those made from magnesium alloy particles including those made from magnesium alloyed with Al, 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 medium to moderate accelerating effects on corrosion rates, while the four others (copper, cobalt, iron and nickel) have an even greater accelerating effect on corrosion. . Exemplary commercially available magnesium alloys that include different combinations of the above alloying elements to obtain different degrees of corrosion resistance include, but are not limited to, for example, those alloyed with aluminum, strontium, and manganese such as AJ62 alloys. AJ50x, AJ51x, and AJ52x, and those alloyed with aluminium, zinc, and manganese that include AZ91A-E alloys.
    [0017] It will be appreciated that alloys having corrosion rates greater than those of the above exemplary alloys are considered to be useful here. For example, nickel has been found to be useful in decreasing the corrosion resistance (i.e., increasing the corrosion rate) of magnesium alloys when included in amounts less than or equal to about 0.5% by weight, specifically less than or equal to about 0.4% by weight, and more specifically less than or equal to about 0.3% by weight, to provide a useful corrosion rate for corrosive downhole article. The above magnesium alloys are useful for forming the intermediate material 26, and can be formed into the desired shape and size by casting, forging and machining.
    [0018] In one embodiment, described magnesium powders or magnesium alloys are useful to form the fixed element 24 as a compact powder. Magnesium alloy powder generally has a particle size of about 50 to about 250 microns (µm), and more specifically about 60 to about 140 µm. The powder can be further coated using a method, such as chemical vapor deposition, anodizing or the like, or mixed by a physical method such as cryo-milling, ball milling, or the like, with a metal or metal oxide, nitride or carbide , such as Al, Ni, W, Co, Cu or Fe, or oxides, nitrides or carbides thereof, or an alloy thereof or a combination thereof. The coatings can have any suitable thickness, including nanoscale coatings having an average thickness of from about 5 nm to about 2500 nm. Such coated powders are referred to herein as controlled electrolytic materials (CEM). The CEM is then molded or compressed into the desired shape, for example, by cold pressing or pressing using an isostatic pressure at about 275 to about 550 MPa (40 to about 80 ksi), followed by extrusion, forging, sintering, or machining, to provide a core having the desired shape and dimensions. CEM materials can include the cellular nanomatrix materials formed from powdered materials described, for example, in copending US Application No. Serial 12/633,682 filed December 8, 2009; US Request No. Serial 13/220,824 filed August 30, 2011; US Request No. Serial 13/220,832 filed August 30, 2011; and US Request No. Serial 13/220,822 filed August 30, 2011, which are incorporated herein by reference in their entirety.
    [0019] It will be understood that the magnesium alloy, or EMF, may thus have any rate of corrosion necessary to obtain the desired performance of the article. In a specific embodiment, the magnesium alloy or EMC used to form the fixed element 24 has a corrosion rate of from about 0.1 to about 150 mg/cm2 /hour, specifically about 1 to about 15 mg/cm2 /hour using 3% by weight KCl at 93°C (200°F).
    [0020] The second material 20 is, in one embodiment, any material that is galvanically less active (having a lower reactivity than the first material 18 and the intermediate material 26), based on, for example, the galvanic salt water series. The second material 20 may include a lower reactive metal such as various types of steel, tungsten, chromium, nickel, copper, cobalt, iron, and alloys thereof or a combination comprising at least one of the foregoing. In one embodiment, the second material 20 can be resistant to corrosion by a corrosive material. As used herein, "resistant" means that the second material is not etched or eroded by any corrosive downhole conditions encountered (ie, saline, hydrogen sulfide, etc., at pressures greater than atmospheric pressure, and under temperatures greater than 50°C), or any well fluid 70 used in conjunction with the articles or methods described herein.
    [0021] By selecting the reactivity of the first and second materials to have a greater or lesser difference in their corrosion potentials, the higher reactivity material (ie, high reactivity metal) corrodes at a faster or slower rate, respectively. In general, for metals in the galvanic series, the order of metals, from most noble (ie, least active and most cathodic) to least noble (ie, most active, most anodic), includes, for example, steel, tungsten , chromium, nickel, cobalt, copper, iron, aluminum, zinc and magnesium.
    [0022] When the combinations of different metals described here are placed in electrical contact in the presence of an electrolyte, an electrochemical potential is generated between the anodic material, more galvanically active, and the cathode material, less galvanically active. The greater the difference in corrosion potential between different metals, the greater electrical potential is generated. In such an arrangement, the cathode material is protected from corrosion by the anode material, where the anodic material corrodes like a sacrificial anode. Corrosion of fixed element 24, for example, in saline and other electrolytes can be controlled (eliminated or substantially reduced) when it is in the first position where it is in electrical contact with the most active first section 14. Electrically couple the anode material and the cathode material with an electrolyte also produces an electrical potential that can also be used to drive a downhole device, such as, for example, a downhole signaling or detection device.
    [0023] Referring to Figure 3, the selectively corrosive article 10 can be used as described herein, and more particularly can be used in accordance with a method 100 of removing a selectively corrosive downhole article 10. Method 100 includes disposing 110 downhole a selectively corrosive downhole article 10, as described herein. Method 100 also includes exposing 120 the selectively corrosive downhole article in a first downhole fluid 72 while the movable cylindrical element is in the first position, wherein the first section is selectively dissolved. Method 100 further includes moving 130 the movable cylindrical element to the second position. Method 100n then includes exposing 140 the selectively corrosive metal downhole article 140 to a second well fluid 74, wherein the fixed element is selectively dissolved.
    [0024] Arranging 110 the selectively corrosive downhole article 10 in downhole can be performed in any suitable manner, including distributing downhole by the use of cables, flexible cable, tubular column or the like. The movable cylindrical element 12 and the fixed element 24 can be arranged at the bottom of the well as individual components, or together as part of an assembly. Either as part of the installation or afterwards, the movable cylinder element 12 is placed in the first position 28 where the first section 14 is disposed over and in electrical contact with the fixed element 24,
    [0025] Since the first section 14 is disposed over and in electrical contact with the fixed element 24, method 100 also includes exposing 120 the selectively corrosive downhole article to a first well fluid 72 while the movable cylindrical element it is in the first position, where the first section is selectively dissolved. The first well fluid 72 may include an aqueous or non-aqueous electrolyte, depending on the application and ability to control environmental conditions. In the downhole environment, controlling environmental conditions to exclude moisture is not practical, and therefore, under such conditions, the electrolyte is generally an aqueous electrolyte. Aqueous electrolytes can include water or a salt dissolved in water, such as saline, or an acid, or a combination comprising at least one of the foregoing. Exposing 120 the selectively corrosive downhole article ’10 to a first downhole fluid 72 may include performing a downhole operation, such as a fracking, for example. During exposure 120, the movable cylindrical element 12 is in the first position 28 where the first section 14 is disposed over and in electrical contact with the fixed element 24. In the first position 28, the first most galvanically active material 18 of the first section 14 acts as an anode and is selectively dissolved or corroded while the less galvanically active intermediate material 26 of the fixed element 24 acts as a cathode and is selectively protected from dissolution and corrosion. The movable cylindrical element 12, particularly the first section 14, and the fixed element 24 may be designed for downhole operation for which they must be used to provide sufficient material for the dissolution or corrosion that occurs during downhole operation. that must be performed.
    [0026] Method 100 further includes moving 130 the movable cylindrical element 12 to the second position 30. In the second position 30, the second section 16 is disposed over and in electrical contact with the fixed element 24. In the second position 30, the element Fixed 24 is configured for selective dissolution because the intermediate material 26 is more galvanically active than the second material 20. In the second position 30, the more galvanically active intermediate material 26 of the fixed element 24 acts as an anode and is selectively dissolved or corroded while the second less galvanically active material 20 of second section 16 acts as a cathode and is selectively protected from dissolution or corrosion. Fixed element 24 and intermediate material 26 can also be selected and designed for well operation for which they are to be used, such as to provide rapid dissolution or corrosion and removal from well 70. Removing fixed element 24 can, for example, be used to open the well for subsequent well operation, such as completion or production operation.
    [0027] Method 100 then includes exposing 140 the selectively corrosive metal downhole article 10 to a second wellbore 74, wherein the fixed element 24 is selectively dissolved. This can also include selective dissolution of other elements, such as bead 50 or buffer 60, as described herein. The second well fluid can be the same well fluid as the first well fluid 72. Alternatively, the second well fluid 74 and the first well fluid 72 can be different well fluids.
    [0028] All variations described here are inclusive of endpoints, and endpoints are independently combinable with one another. The suffix "(s)" as used herein is intended to include the singular and plural of the term it modifies, thereby including at least one of this term (for example, the dye(s) includes at least one dye) . "Optional" or "optionally|" means that the event or circumstance subsequently described may or may not occur, and that the description includes cases where the event occurs and cases where it does not. As used herein, "combination" includes compounds, mixtures, alloys, reaction products, and the like. All references are incorporated herein by reference.
    [0029] The use of the terms "a" and "an" and "the" and "a" and similar referents in the context of describing the invention (especially in the context of the following claims) should be construed to cover the singular and plural, unless otherwise indicated here or clearly contradicted by context. Additionally, it should still be noted that the terms "first", "second", and the like here do not indicate any order, quantity or importance, but rather are used to distinguish one element from another. The "around" modifier used in connection with a quantity is inclusive of the stated value and has the meaning dictated by the context (for example, it includes the degree of error associated with measuring the particular quantity).
    [0030] While one or more embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
    权利要求:
    Claims (14)
    [0001]
    1. Selectively corrodible downhole article (10), characterized in that it comprises: a movable cylindrical member (12) comprising a first section (14) and an axially separated second section (16), the first section (14) comprising a first material (18) having a first galvanic activity, the second section (16) comprising a second material (20) having a second galvanic activity, the first galvanic activity being greater than the second galvanic activity, the first section (14) being electrically isolated from the second section (16); and a fixed member (24) disposed on the cylindrical member and configured for electrical contact with the first section (14) or the second section (16), the fixed member (24) comprising an intermediate material (26) having an intermediate galvanic activity, the intermediate galvanic activity being between the first galvanic activity and the second galvanic activity, the movable cylindrical member (12) configured for movement from a first position (28) wherein the first section (14) is disposed over and in electrical contact with the fixed member (24), wherein in the first position (28), the first section (14) is configured for selective dissolution, and wherein in the second position (30), the fixed member (24) is configured for selective dissolution.
    [0002]
    2. Article according to claim 1, characterized in that the movable member (12) comprises a movable tubular article.
    [0003]
    3. Article according to claim 1, characterized in that the movable member (12) comprises a slip-on sleeve disposed inside a tubular article.
    [0004]
    4. Article according to claim 1, characterized in that the first material (18) comprises magnesium.
    [0005]
    5. Article according to claim 1, characterized in that the second material (20) comprises steel, tungsten, chromium, nickel, copper, cobalt, iron or an alloy thereof, or a combination comprising at least one of the preceding ones.
    [0006]
    6. Article according to claim 1, characterized in that the intermediate material (26) comprises magnesium, aluminum, manganese or zinc, or an alloy thereof, or a combination comprising at least one of the foregoing.
    [0007]
    7. Article according to claim 1, characterized in that the first section (14) comprises a controlled electrolytic material.
    [0008]
    8. Article according to claim 1, characterized in that the fixed member (24) comprises a controlled electrolytic material.
    [0009]
    9. Article according to claim 1, characterized in that the fixed member (24) comprises a ball or a ball seat.
    [0010]
    10. Article according to claim 1, characterized in that the fixed member (24) comprises a plug or a plug seat.
    [0011]
    11. Method of removing a selectively corrosive downhole article, characterized by comprising: arranging in the downhole a selectively corrosive downhole article comprising: a movable cylindrical member (12) comprising a first section (14) and a second section (16) axially separated, the first section (14) comprising a first material (18) having a first galvanic activity, the second section (16) comprising a second material (20) having a second galvanic activity, the first galvanic activity being greater than the second galvanic activity, the first section (14) being electrically isolated from the second section (16); and a fixed member (24) disposed on the cylindrical member and configured for electrical contact with the first section (14) or the second section (16), the fixed member (24) comprising an intermediate material (26) having an intermediate galvanic activity, the intermediate galvanic activity being between the first galvanic activity and the second galvanic activity, the movable cylindrical member (12) configured for movement from a first position (28) wherein the first section (14) is disposed over and in electrical contact with the fixed member (24), wherein in the first position (28), the first section (14) is configured for selective dissolution, and wherein in the second position (30), the fixed member (24) is configured to selective dissolution; exposing the selectively corrosive downhole article to a first well fluid while the movable cylindrical member (12) is in the first position (28), wherein the first section (14) is selectively dissolved; moving the cylindrical member mobile (12) for the next in position (30); and exposing the selectively corrosive metal downhole article to a second well fluid, wherein the fixed member (24) is selectively dissolved.
    [0012]
    12. The method of claim 11, characterized in that the fixed member (24) is selectively dissolved sufficiently to remove it from the selectively corrosive downhole article.
    [0013]
    13. Method according to claim 11, characterized in that the first well fluid and the second well fluid are the same fluid.
    [0014]
    14. Method according to claim 11, characterized in that the first well fluid and the second well fluid are different fluids.
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    AU2014385212B2|2016-12-22|Methods of adjusting the rate of galvanic corrosion of a wellbore isolation device
    AU2014377594B2|2016-12-22|Isolation device containing a dissolvable anode and electrolytic compound
    同族专利:
    公开号 | 公开日
    EP2815066A4|2015-11-25|
    EP2815066B1|2017-09-27|
    CA2871121C|2017-03-21|
    CA2871121A1|2013-08-22|
    CN104204402B|2017-04-26|
    US9068428B2|2015-06-30|
    DK2815066T3|2017-11-13|
    AU2013219919B2|2016-07-14|
    WO2013122712A1|2013-08-22|
    MY171331A|2019-10-09|
    NO2922557T3|2018-03-03|
    EP2815066B8|2017-11-15|
    US20130206425A1|2013-08-15|
    BR112014018566A2|2017-06-20|
    AU2013219919A1|2014-07-03|
    CN104204402A|2014-12-10|
    BR112014018566A8|2021-02-17|
    EP2815066A1|2014-12-24|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-10| 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 16/01/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/371,788|2012-02-13|
    US13/371,788|US9068428B2|2012-02-13|2012-02-13|Selectively corrodible downhole article and method of use|
    PCT/US2013/021646|WO2013122712A1|2012-02-13|2013-01-16|Selectively corrodible downhole article and method of use|
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