Electrokinetic enhanced hydrocarbon recovery from oil shale
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-043/00
E21B-043/16
E21B-043/24
출원번호
US-0335907
(2011-12-22)
등록번호
US-9033033
(2015-05-19)
발명자
/ 주소
Thomas, David Glynn
Wigand, Marcus O.
출원인 / 주소
Chevron U.S.A. Inc.
인용정보
피인용 횟수 :
1인용 특허 :
219
초록▼
Disclosed herein are methods for extracting a kerogen-based product from subsurface (oil) shale formations. These methods rely on chemically modifying the shale-bound kerogen using a chemical oxidant so as to render it mobile. The oxidant is provided to a formation fluid in contact with the kerogen
Disclosed herein are methods for extracting a kerogen-based product from subsurface (oil) shale formations. These methods rely on chemically modifying the shale-bound kerogen using a chemical oxidant so as to render it mobile. The oxidant is provided to a formation fluid in contact with the kerogen in the subsurface shale utilizing electrokinetic-induced migration. An electric field is generated through at least a portion of the kerogen rich zone to induce electrokinetic migration of the oxidant. A mobile kerogen-based product, that includes reaction products of kerogen conversion, is urged toward a production well utilizing electrokinetic-induced migration, and withdrawn from the subsurface shale formation. An electric field generated through at least a portion of the kerogen rich zone can also be utilized to induce migration of catalysts or catalyst precursors.
대표청구항▼
1. A process for extracting a kerogen-based product from a subsurface shale formation comprising a kerogen rich zone, the process comprising: providing an injection well and a production well that extend into a subsurface shale formation and are in fluid communication therewith;injecting an oxidant
1. A process for extracting a kerogen-based product from a subsurface shale formation comprising a kerogen rich zone, the process comprising: providing an injection well and a production well that extend into a subsurface shale formation and are in fluid communication therewith;injecting an oxidant into the subsurface shale formation through the injection well;generating an electric field through at least a portion of the subsurface shale formation to induce electrokinetic migration of the oxidant, wherein the electric field is generated by placing one or more electrodes in communication with the injection well for creating a direct current having a voltage of less than about 50 volts per meter (V/m);contacting the kerogen in the subsurface shale formation with the oxidant at a temperature in the range of between 0° C. and 200° C. to form organic acids, wherein no external heating is provided for the contact; andmobilizing at least a portion of the organic acids from the subsurface shale formation through the production well to produce a mobile kerogen-based product. 2. The process according to claim 1, wherein the oxidant is injected into the subsurface shale formation combined with an aqueous carrier fluid. 3. The process according to claim 2, wherein the carrier fluid contains in the range from 0.1 wt. % to 40 wt. % of the oxidant. 4. The process according to claim 2, wherein the carrier fluid has a pH in the range from 7 to 14. 5. The process according to claim 1, wherein the oxidant is a permanganate oxidant. 6. The process according to claim 5, wherein the permanganate oxidant is selected from the group consisting of ammonium permanganate, NH4MnO4; calcium permanganate, Ca(MnO4)2; potassium permanganate, KMnO4; and sodium permanganate, NaMnO4. 7. The process according to claim 2, wherein the carrier fluid further comprises a surfactant. 8. The process according to claim 1, further comprising contacting the kerogen in the subsurface shale formation with the oxidant at a pH in the range from 7 to 14 to form organic acids. 9. The process according to claim 8, further comprising maintaining the pH in the range from 7 to 14 by supplying an alkaline material selected from the group consisting of a carbonate, a bicarbonate, an oxide and a hydroxide to the kerogen. 10. The process according to claim 9, further comprising contacting the kerogen in the subsurface shale formation with the oxidant at a pH in the range from 7 to 9. 11. The process according to claim 1, further comprising providing a reactive fluid to the kerogen, the reactive fluid comprising from 0.1 wt. % to 40 wt. % of the oxidant in a carrier fluid selected from the group consisting of an aqueous fluid, an ethanol fluid or combinations thereof. 12. The process according to claim 11, wherein the reactive fluid further comprises a sufficient amount of an alkaline material to yield a reactive fluid having a pH in a range from 7 to 9. 13. The process according to claim 11, wherein the reactive fluid further comprises in the range from 2 wt. % to 10 wt. % of a surfactant. 14. The process according to claim 13, wherein the surfactant comprises organic acids. 15. The process according to claim 11, further comprising generating an electric field through at least a portion of the subsurface shale formation to induce electrokinetic migration of the reactive fluid. 16. The process according to claim 1, wherein the electric field is generated by emitting a direct current between a pair of electrodes having opposite charges and being spaced apart from one another within the kerogen rich zone. 17. The process according to claim 1, wherein the electric field is generated by emitting a direct current between a first electrode coupled to the injection well and a second electrode within the kerogen rich zone. 18. The process according to claim 1, wherein the electric field is generated by emitting a direct current having a voltage of less than about 20 volts per meter between a pair of electrodes. 19. A process for extracting a kerogen-based product from a subsurface shale formation comprising a kerogen rich zone, the process comprising: providing an injection well and a production well that extend into a subsurface shale formation and are in fluid communication therewith;injecting an oxidant into the subsurface shale formation through the injection well;contacting the kerogen in the subsurface shale formation with the oxidant at a temperature in the range of between 0° C. and 200° C. to form organic acids, wherein no external heating is provided for the contact; andmobilizing at least a portion of the organic acids from the subsurface shale formation through the production well to produce a mobile kerogen-based product; andgenerating an electric field through at least a portion of the subsurface shale formation to induce electrokinetic migration of the mobile kerogen-based product to a production well, wherein the electric field is generated by placing one or more electrodes in communication with the injection well for creating a direct current having a voltage of less than about 50 volts per meter (V/m). 20. The process according to claim 19, wherein the electric field is generated by emitting a direct current between a pair of electrodes having opposite charges and being spaced apart from one another within the kerogen rich zone. 21. The process according to claim 19, wherein the electric field is generated by emitting a direct current between a pair of electrodes with the first electrode coupled to the production well and a second electrode within the kerogen rich zone. 22. The process according to claim 21, wherein the direct current has a voltage of less than about 20 volts per meter. 23. The process according to claim 21, wherein the direct current is periodically pulsed. 24. The process according to claim 21, wherein polarity of the pair of electrodes is periodically reversed. 25. A process for enhancing hydrocarbon recovery in subsurface shale formations, the method comprising: providing an injection well and a production well that extend into a kerogen rich zone of a subsurface shale formation and are in fluid communication therewith;providing a plurality of electrodes interspersed within the kerogen rich zone of a subsurface shale formation for creating a direct current having a voltage of less than about 50 volts per meter (V/m) through at least a portion of the subsurface shale formation;injecting an oxidant into the kerogen rich zone through the injection well for the kerogen to be in contact with the oxidant at a temperature in the range of between 0° C. and 200° C., wherein no external heating is provided for the contact;emitting a direct current between the plurality of electrodes to induce electrokinetic migration of the oxidant;recovering hydrocarbons from the kerogen rich zone of the subsurface shale formation through the production well. 26. The process according to claim 25, further comprising: providing a reactive fluid to the kerogen rich zone and adjusting the direct current emitted between one or more of the plurality of electrodes such that the reactive fluid migrates to unswept areas of the kerogen rich zone. 27. The process according to claim 25, further comprising injecting a catalyst or catalyst precursor into the subsurface shale formation for the direct current through at least a portion of the subsurface shale formation-to induce electrokinetic migration of the catalyst or catalyst precursor. 28. The process according to claim 27, further comprising injecting a reactive fluid comprising the catalyst or catalyst precursor. 29. The process according to claim 27, wherein the catalyst or catalyst precursor is an ionic metal, a complexed metal or an encapsulated metal. 30. The process according to claim 27, wherein the catalyst or catalyst precursor is a metal selected from the group consisting of magnesium, calcium, vanadium, chromium, molybdenum, manganese, iron, cobalt, nickel, palladium, platinum, copper, zinc, aluminum, and silicon. 31. The process according to claim 27, wherein the catalyst or catalyst precursor is an ionic metal selected from the group consisting of Ni2+, Ni1+, Mo2+, Cu2+,Cu3+, Fe2+, Fe3+. 32. The process according to claim 27, wherein the catalyst or catalyst precursor is induced to be deposited on the kerogen. 33. A process for extracting a kerogen-based product from a subsurface shale formation comprising a kerogen rich zone, the process comprising: providing an injection well and a production well that extend into a subsurface shale formation and are in fluid communication therewith;injecting a catalyst or catalyst precursor into the subsurface shale formation through the injection well;generating an electric field having a voltage of less than about 50 volts per meter (V/m) through at least a portion of the subsurface shale formation to induce electrokinetic migration of the catalyst or catalyst precursor;contacting the kerogen in the subsurface shale formation with the catalyst precursor at a temperature in the range of between 0° C. and 200° C. to form kerogen conversion products, wherein no external heating is provided for the contact; andmobilizing at least a portion of the kerogen conversion products through the production well to produce a mobile kerogen-based product. 34. A process for extracting a kerogen-based product from a subsurface shale formation comprising a kerogen rich zone, the process comprising: providing an injection well and a production well that extend into a subsurface shale formation and are in fluid communication therewith;injecting a catalyst or catalyst precursor into the subsurface shale formation through the injection well;contacting the kerogen in the subsurface shale formation with the catalyst or catalyst precursor at a temperature in the range of between 0° C. and 200° C. to form kerogen conversion products, wherein no external heating is provided for the contact;mobilizing at least a portion of the kerogen conversion products from the subsurface shale formation through the production well to produce a mobile kerogen-based product; andgenerating an electric field through at least a portion of the subsurface shale formation to induce electrokinetic migration of the mobile kerogen-based product to the production well wherein the electric field is generated by placing one or more electrodes in communication with the injection well for creating a direct current having a voltage of less than about 50 volts per meter (V/m).
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이 특허에 인용된 특허 (219)
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