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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0162781 (2011-06-17) |
등록번호 | US-9139928 (2015-09-22) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 1 인용 특허 : 416 |
A method of removing a corrodible downhole article having a surface coating includes eroding the surface coating by physical abrasion, chemical etching, or a combination of physical abrasion and chemical etching, the surface coating comprising a metallic layer of a metal resistant to corrosion by a
A method of removing a corrodible downhole article having a surface coating includes eroding the surface coating by physical abrasion, chemical etching, or a combination of physical abrasion and chemical etching, the surface coating comprising a metallic layer of a metal resistant to corrosion by a corrosive material.
1. A method of removing a corrodible downhole article having a core and a surface coating disposed on the core, the method comprising: eroding the surface coating by physical abrasion, chemical etching, or a combination of physical abrasion and chemical etching,wherein the surface coating comprises:
1. A method of removing a corrodible downhole article having a core and a surface coating disposed on the core, the method comprising: eroding the surface coating by physical abrasion, chemical etching, or a combination of physical abrasion and chemical etching,wherein the surface coating comprises: a metallic layer resistant to corrosion by a corrosive material,the metallic layer comprising tungsten, cobalt, copper, iron, nickel, aluminum, nickel alloy, aluminum alloy, or a combination comprising at least one of nickel, aluminum, nickel alloy, or aluminum alloy; andwherein the core comprises magnesium alloy having greater than zero but less than 1 weight percent of nickel. 2. The method of claim 1, wherein the corrodible core comprises magnesium alloy having greater than zero but less than or equal to about 0.5 weight percent of nickel. 3. The method of claim 1, wherein eroding is by physical abrasion alone. 4. The method of claim 1, wherein eroding comprises flowing a slurry of a proppant over the surface coating of the corrodible downhole article. 5. The method of claim 4, wherein the proppant includes sand, aluminum pellets, glass beads, ceramic beads, and combinations comprising at least one of the foregoing. 6. The method of claim 1, further comprising corroding the downhole article in the corrosive material after eroding. 7. The method of claim 6, wherein the corrosive material is water, brine, an acid, hydrogen sulfide, or a combination comprising at least one of the foregoing. 8. The method of claim 1, wherein the metallic layer has a thickness of less than or equal to about 1,000 micrometers. 9. The method of claim 1, wherein the metallic layer is formed by an electroless plating process, or by an electrodeposition process in the presence of an anhydrous ionic solvent. 10. The method of claim 1, wherein the corrodible downhole article is a ball, ball seat or frac plug. 11. The method of claim 1, wherein the metallic layer has a thickness of about 50 to about 750 micrometers. 12. The method of claim 1, wherein the core comprises magnesium alloyed with about 0.25 wt% of Ni. 13. The method of claim 1, wherein the core comprises about 0.25 to about 1 wt% of Ni. 14. A method of forming a reversible seal with a corrodible downhole article, comprising seating a ball or plug in the corrodible downhole article having a shaped surface which accommodates a surface shape of the ball or plug, the corrodible downhole article comprising: a magnesium alloy core comprising greater than zero but less than or equal to about 1 wt% of nickel, anda metallic layer covering the magnesium alloy core, the metallic layer being resistant to corrosion by a corrosive material and comprising tungsten, cobalt, copper, iron, nickel, nickel alloy, aluminum, aluminum alloy, or a combination comprising at least one of nickel, nickel alloy, aluminum, or aluminum alloy;wherein the corrodible downhole article prevents fluid flow when the ball or plug is seated. 15. The method of claim 14, wherein seating comprises placing the ball or plug in a downhole environment and applying pressure to the downhole environment. 16. The method of claim 15, further comprising removing the metallic layer of the corrodible downhole article, prior to seating, by injecting a slurry of a proppant into the downhole environment at a pressure greater than that of the downhole environment. 17. The method of claim 16, wherein the proppant slurry flows past the article and erodes the metallic layer to expose the magnesium alloy core. 18. The method of claim 17, further comprising corroding the exposed magnesium alloy core in a corrosive material. 19. The method of claim 15, further comprising unseating the ball or the plug seated in the corrodible downhole article by reducing the pressure applied to the downhole environment to a pressure below that of an ambient downhole pressure. 20. A method of removing a corrodible downhole article comprising: a core, anda metallic layer covering the core,the method comprising eroding the metallic layer by physical abrasion, chemical etching, or a combination of physical abrasion and chemical etching, andcorroding the corrodible downhole article in a corrosive material after eroding,wherein the core of the corrodible downhole article comprises magnesium alloy and greater than zero but less than or equal to about 1 wt% of nickel; andthe metallic layer of the downhole article comprises tungsten, cobalt, copper, iron, nickel, nickel alloy, aluminum, aluminum alloy, or a combination comprising at least one of nickel, nickel alloy, aluminum, or aluminum alloy.
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