[특허]Solvent assisted oil recovery

Solvent assisted oil recovery 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C09K-008/524 C09K-008/64 C09K-008/594
출원번호	US-0988867 (2009-04-23)
등록번호	US-8846582 (2014-09-30)
우선권정보	GB-0807386.8 (2008-04-23)
국제출원번호	PCT/GB2009/001059 (2009-04-23)
§371/§102 date	20110216 (20110216)
국제공개번호	WO2009/130482 (2009-10-29)
발명자 / 주소	Hughes, Trevor Tustin, Gary Wilson, Alexander Abad, Carlos
출원인 / 주소	Schlumberger Technology Corporation
인용정보	피인용 횟수 : 1 인용 특허 : 50

초록 ▼

The recovery of oil from a reservoir is assisted by injecting a diluent into the reservoir formation to reduce the viscosity of the crude oil. This diluent is a mixture of a material which is an asphaltene precipitant, especially supercritical carbon dioxide, and a more polar material which comprises at least one aliphatic compound which includes at least one of a cycloaliphatic ring, an olefinic unsaturation, an ester or ether group. The inclusion of such an aliphatic compound which is more polar than the asphaltene precipitant reduces asphaltene precipitation and can enhance the efficiency of oil recovery when the precipitant is by supercritical carbon dioxide.

대표청구항 ▼

1. A method of recovering oil from a reservoir, comprising injecting a viscosity reducing diluent into the reservoir via an injection well to assist oil recovery via a production well spaced from the injection well, wherein the diluent comprises an asphaltene precipitant which comprises carbon dioxide which is in supercritical state when injected into the reservoir and wherein the method also comprises injecting into the reservoir a further viscosity reducing diluent substance which is more polar than the asphaltene precipitant and which reduces asphaltene precipitation, wherein-said further viscosity reducing diluent substance comprises at least one aliphatic compound which consists of carbon, hydrogen and oxygen atoms only, contains from 4 to 70 carbon atoms and includes at least one of the following: a cycloaliphatic ring;an olefinic unsaturation; andan ester or ether group; with any oxygen atom being present within a said ester or ether group. 2. A method according to claim 1 wherein the said further viscosity reducing diluent substance has a Hildebrand solubility parameter in the range from 16 to 21 MPa1/2. 3. A method according to claim 1 wherein the said further viscosity reducing diluent substance has Hansen solubility parameters in the ranges: δd 14.5-19.6 MPa1/2 δp 0-8.2 MPa1/2 δh 0-6.8 MPa1/2. 4. A method according to claim 1 wherein the said further viscosity reducing diluent substance comprises at least one hydrocarbon containing 5 to 20 carbon atoms and having at least one cycloaliphatic ring and/or at least one olefinic unsaturation. 5. A method according to claim 1 wherein the said further viscosity reducing diluent substance comprises at least one aliphatic ester containing at least one a saturated or unsaturated aliphatic chain of 6 to 22 carbon atoms. 6. A method according to claim 5 wherein the said further viscosity reducing diluent substance comprises at least one ester of the general formula R1—COO—R2 where R1 and R2 are straight or branched aliphatic hydrocarbon chains optionally including olefinic unsaturation and having a length of 1 to 22 carbon atoms and where R1 and R2 together contain 12 to 44 carbon atoms. 7. A method according to claim 6 wherein R1 comprises a straight or branched aliphatic hydrocarbon chain optionally including olefinic unsaturation and having a length of 11 to 18 carbon atoms and where R2 comprises methyl, ethyl, propyl and/or butyl. 8. A method according to claim 5 wherein the said further viscosity reducing diluent substance comprises diesters of formula R1—Z1—R3—Z2—R2 where Z1 and Z2 each represent COO or OCO, R1, R2 and R3 are straight or branched aliphatic hydrocarbon chains optionally including olefinic unsaturation and each having a length of 1 to 22 carbon atoms, and R1, R2 and R3 together contain from 12 to 66 carbon atoms. 9. A method according to claim 5 wherein the said further viscosity reducing diluent substance comprises triglycerides of formula R1COO—CH2—CH(OCOR4)—CH2—OCOR2 where R1, R2 and R4 are straight or branched aliphatic hydrocarbon chains optionally including olefinic unsaturation and each having a length of 1 to 22 carbon atoms, and R1, R2 and R4 together contain from 12 to 66 carbon atoms. 10. A method according to claim 9 wherein R1, R2 and R4 each contain from 11 to 21 carbon atoms. 11. A method according to claim 1 wherein the said further viscosity reducing diluent substance comprises a mixture of at least one hydrocarbon containing 5 to 20 carbon atoms and having at least one cycloaliphatic ring and/or at least one olefinic unsaturation andat least one aliphatic ester containing at least one a saturated or unsaturated aliphatic chain of 6 to 22 carbon atoms. 12. A method according to claim 1 wherein both the carbon dioxide and the more polar further viscosity reducing diluent substance are injected into the reservoir via the same injection wellbore, with the carbon dioxide in a supercritical state and the further viscosity reducing diluent substance in solution in the supercritical carbon dioxide. 13. A method according to claim 1 wherein the said more polar further viscosity reducing diluent substance which reduces asphaltene precipitation is injected via a production wellbore into the region of the reservoir adjacent to that wellbore. 14. A method according to claim 1 wherein the asphaltene precipitant comprises hydrocarbon mixed with carbon dioxide which is in supercritical state when injected into the reservoir. 15. A method according to claim 2 wherein the further viscosity reducing diluent substance has a Hildebrand solubility parameter less than 18.2 MPa1/2.

이 특허에 인용된 특허 (50)

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이 특허를 인용한 특허 (1)

Ovalles, Cesar; Rogel, Estrella, Process for in situ upgrading of a heavy hydrocarbon using asphaltene precipitant additives.
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A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Solvent assisted oil recovery 원문보기

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Solvent assisted oil recovery 원문보기

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연구과제 타임라인

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이 특허에 인용된 특허 (50)

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