IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0167512
(2008-07-03)
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등록번호 |
US-7726402
(2010-06-22)
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발명자
/ 주소 |
- Ramakrishnan, Terizhandur S.
- Loubens, Romain De
- Altundas, Yusuf Bilgin
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출원인 / 주소 |
- Schlumberger Technology Corporation
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
9 인용 특허 :
1 |
초록
▼
Carbon dioxide is sequestered in a formation using a dual completion and injection method that reduces or eliminates upward leak rates of the sequestered carbon dioxide. The dual completion and injection method involves the injection of a benign fluid such as brine (water) into a permeable layer of
Carbon dioxide is sequestered in a formation using a dual completion and injection method that reduces or eliminates upward leak rates of the sequestered carbon dioxide. The dual completion and injection method involves the injection of a benign fluid such as brine (water) into a permeable layer of the formation located above the sequestration layer and which is separated form the sequestration layer by a nearly impermeable layer. The water is preferably injected at the same time the carbon dioxide is injected.
대표청구항
▼
What is claimed is: 1. A method for sequestration of carbon dioxide in a formation traversed by a cased wellbore, comprising: a) finding a location in the formation having a first permeable layer directly overlain by a nearly impermeable layer, which in turn is overlain by a second permeable layer;
What is claimed is: 1. A method for sequestration of carbon dioxide in a formation traversed by a cased wellbore, comprising: a) finding a location in the formation having a first permeable layer directly overlain by a nearly impermeable layer, which in turn is overlain by a second permeable layer; b) completing the wellbore as a dual completion wellbore and with perforations in the casing for the purpose of injecting carbon dioxide into the first permeable layer and injecting water into the second permeable layer; and c) injecting carbon dioxide and water into their respective layers simultaneously, with the nearly impermeable layer therebetween, where the water is injected at a pressure of at least p w i = p g i - ρ g g ( z 0 - z m 0 ) + ρ w g ( z 0 - z m 2 ) - C γ ϕ 1 k 1 , where pwi is the water injection pressure, pgi is the carbon dioxide injection pressure, g is the acceleration due to gravity, ρg and ρw are the densities of the carbon dioxide and water respectively, zm0 is the measurement point for pressure in said first permeable layer, zm2 is the measurement point for pressure in said second permeable layer, z0 is the depth at the top of the first permeable layer, γ is the interfacial tension between said carbon dioxide and said water, φ1 and k1 are the porosity and the permeability of said nearly impermeable layer, and C is a constant. 2. A method according to claim 1, wherein: said water is injected at a pressure less than or equal to pwi=pgi−ρgg(z0−zm0)+ρwg(z0−zm2). 3. A method according to claim 2, wherein: said water is injected at a pressure approximately equal to p w i = ( p g i - ρ g g ( z 0 - z m 0 ) + ρ w g ( z 0 - z m 2 ) ) - 1 2 C γ ϕ 1 k 1 . 4. A method according to claim 3, wherein: C has a value between 0.1 and 0.3. 5. A method according to claim 1, wherein: said finding comprises reviewing logs of the formation, said logs including indications of a plurality of layers in the formation including said first permeable layer, said nearly impermeable layer and said second permeable layer, and indications of permeability of said plurality of layers in the formation. 6. A method according to claim 1, wherein: said completing comprises perforating the casing adjacent the second permeable layer at a lower portion of said second permeable layer adjacent said nearly impermeable layer. 7. A method according to claim 1, wherein: said completing comprises perforating the casing adjacent the second permeable layer along a lower bottom half of said second permeable layer. 8. A method according to claim 1, wherein: said completing comprises perforating the casing adjacent the second permeable layer along the entire second permeable layer. 9. A method according to claim 1, further comprising: conducting simulations of the formation with different assumptions of length of perforation along said second permeable layer and which provide resultant indications of expected carbon dioxide leakage from the first permeable layer based on said assumptions, and based on results of said conducting simulations, selecting a length of the casing adjacent said second permeable layer for perforation. 10. A method according to claim 9, wherein: said selecting comprises selecting a minimum length where expected carbon dioxide leakage is negligible. 11. A method for sequestration of carbon dioxide in a formation traversed by a cased wellbore, comprising: a) finding a location in the formation having a first permeable layer directly overlain by a nearly impermeable layer, which in turn is overlain by a second permeable layer; b) running simulations of the formation assuming injection of carbon dioxide into the first permeable layer and injection of water along different lengths of the second permeable layer in order to find a length which provides desired results concerning leakage of carbon dioxide from the first permeable layer; b) completing the wellbore as a dual completion wellbore and with perforations in the casing along said first permeable layer for the purpose of injecting carbon dioxide into the first permeable layer and with second perforations in the casing along said length which provides desired results for the purpose of injecting water into the second permeable layer; and c) injecting carbon dioxide and water into their respective layers simultaneously, with the nearly impermeable layer therebetween, where the water is injected at a pressure at least equal to the carbon dioxide injection pressure minus an entry capillary pressure of the carbon dioxide into the said nearly impermeable layer, plus a gravitational head correction for the water and carbon dioxide. 12. A method according to claim 11, wherein: said water is injected at a pressure at or below said carbon dioxide injection pressure plus said gravitational head correction. 13. A system for sequestration of carbon dioxide in a formation having a surface and thereunder a first permeable layer directly overlain by a nearly impermeable layer, which in turn is overlain by a second permeable layer, the formation being traversed by a cased wellbore, comprising: a) a first pump coupled to a source of carbon dioxide; b) a second pump coupled to a source of water; c) a dual completion of the cased wellbore, said dual completion coupled to said first pump and to said second pump and providing independent communication between the surface and the first permeable layer and between the surface and the second permeable layer, wherein said first pump pumps the carbon dioxide down the dual completion and into the first permeable layer at a first injection pressure, and simultaneously the second pump pumps the water down the dual completion and into the second permeable layer at a second injection pressure, said second injection pressure at least equal to said first injection pressure plus a gravitational head correction for the water and carbon dioxide minus an entry capillary pressure of the carbon dioxide into the nearly impermeable layer. 14. A system according to claim 13, wherein: said second injection pressure is less than or equal to said first injection pressure plus said gravitational head correction. 15. A system according to claim 14, wherein: said injection pressure is approximately equal to said first injection pressure plus said gravitational head correction minus one-half said entry capillary pressure. 16. A system according to claim 13, further comprising: a first pressure sensor in the dual completion, said first pressure sensor sensing said first injection pressure, and a second pressure sensor in the dual completion, said second pressure sensor sensing said second injection pressure. 17. A system according to claim 16, further comprising: a controller coupled to said first pressure sensor, said second pressure sensor, said first pump and said second pump.
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