Method of controlling corrosion rate in downhole article, and downhole article having controlled corrosion rate
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-029/00
E21B-034/06
E21B-034/14
E21B-033/12
E21B-041/00
출원번호
US-0204359
(2011-08-05)
등록번호
US-9057242
(2015-06-16)
발명자
/ 주소
Mazyar, Oleg A.
Johnson, Michael
Gaudette, Sean
출원인 / 주소
Baker Hughes Incorporated
대리인 / 주소
Cantor Colburn LLP
인용정보
피인용 횟수 :
8인용 특허 :
415
초록▼
A method of removing a downhole assembly comprises contacting, in the presence of an electrolyte, a first article comprising a first material and acting as an anode, and a second article comprising a second material having a lower reactivity than the first material and acting as a cathode, the downh
A method of removing a downhole assembly comprises contacting, in the presence of an electrolyte, a first article comprising a first material and acting as an anode, and a second article comprising a second material having a lower reactivity than the first material and acting as a cathode, the downhole assembly comprising the first article in electrical contact with the second article, wherein at least a portion of the first article is corroded in the electrolyte.
대표청구항▼
1. A method of removing a downhole assembly, comprising contacting, in the presence of an electrolyte,a first article comprising a first material and acting as an anode, anda second article comprising a second material having a lower reactivity than the first material and acting as a cathode,the dow
1. A method of removing a downhole assembly, comprising contacting, in the presence of an electrolyte,a first article comprising a first material and acting as an anode, anda second article comprising a second material having a lower reactivity than the first material and acting as a cathode,the downhole assembly comprising the first article in electrical contact with the second article,wherein at least a portion of the first article is corroded in the electrolyte; andwherein the first material comprises a magnesium alloy having less than or equal to about 0.5 weight percent of nickel. 2. The method of claim 1, wherein the first article has a non-metallic coating on a surface thereof. 3. The method of claim 2, wherein the coating comprises a soluble glass, a soluble polymer, or a metal oxide or hydroxide coating. 4. The method of claim 2, wherein the non-metallic coating is magnesium hydroxide. 5. The method of claim 2, wherein the non-metallic coating is removed by application of an electric potential to establish electrical contact between the first and second articles. 6. The method of claim 1, wherein the second material comprises steel, tungsten, chromium, nickel, cobalt, copper, iron, aluminum, zinc, alloys thereof, or a combination comprising at least one of the foregoing. 7. The method of claim 1, wherein the first article is a controlled electrolytic material (CEM) ball or fracture plug. 8. The method of claim 1, wherein the second article is a ball seat. 9. The method of claim 1, wherein the first article comprises: a corrodible core comprising the first material and at least partially penetrating the first article, anda non-corrodible surrounding structure comprising the second material,wherein only the core is corroded. 10. The method of claim 1, wherein the first article comprises: a non-corrodible core comprising the second material and at least partially penetrating the first article, anda corrodible surrounding structure comprising the first material,wherein only the surrounding structure is corroded. 11. The method of claim 1, wherein the electrolyte is water, brine, acid, or a combination comprising at least one of the foregoing. 12. The method of claim 1, wherein the first material and the second material are selected such that the first material has a corrosion rate of about 0.1 to about 150 mg/cm2/hour using aqueous 3 wt % KCl at 200° F. 13. The method of claim 1, wherein the magnesium alloy in the first material further comprises one or more of the following: Al; Cd; Ca; Co; Cu; Fe; Mn; Si; Ag; Sr; Th; Zn; or Zr. 14. A method of producing an electrical potential in a downhole assembly, comprising contacting, with an electrolyte,a first article, the first article comprising a first material and acting as an anode, anda second article, the second article comprising a second material having a lower reactivity than the material of the first article and acting 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 of nickel. 15. The method of claim 14, wherein the electrolyte is water, brine, an acid, or a combination comprising at least one of the foregoing. 16. The method of claim 14, wherein the second material comprises steel, tungsten, chromium, nickel, cobalt, copper, iron, aluminum, zinc, alloys thereof, or a combination comprising at least one of the foregoing. 17. The method of claim 14, further comprising corroding the first article in the electrolyte. 18. A downhole assembly, comprising: a first article comprising a first material and acting as an anode, anda second article comprising a second material having a lower reactivity than the first material and acting as a cathode,the first and second articles being electrically connected by a conductive element to form a circuit,wherein in the presence of an electrolyte, the downhole assembly produces an electrical potential, and at least a portion of the first article is corroded; andwherein the first material comprises a magnesium alloy having less than or equal to about 0.5 weight percent of nickel. 19. The article of claim 18, wherein the second material comprises steel, tungsten, chromium, nickel, cobalt copper, iron, aluminum, zinc, alloys thereof, or a combination comprising at least one of the foregoing. 20. The article of claim 18, wherein the first article is a ball, and the second article is a ball seat. 21. A method of removing a downhole assembly, comprising: contacting, in the presence of an electrolyte,a first article comprising a first material and acting as an anode, anda second article comprising a second material having a lower reactivity than the first material and acting as a cathode,the downhole assembly comprising the first article in electrical contact with the second article, wherein at least a portion of the first article is corroded in the electrolyte; andwherein the first article has a non-metallic coating comprising magnesium hydroxide on a surface thereof.
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