Process for reducing the production of water in oil wells
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-033/138
E21B-043/22
E21B-043/16
출원번호
US-0474319
(2002-05-13)
우선권정보
IT-MI2001A1113(2001-05-25)
국제출원번호
PCT/EP02/005233
(2002-05-13)
§371/§102 date
20031007
(20031007)
국제공개번호
WO02/097236
(2002-12-05)
발명자
/ 주소
Chiappa,Luisa
Andrei,Maria
Lockhart,Thomas Paul
Burrafato,Giovanni
Maddinelli,Giuseppe
출원인 / 주소
Eni S.p.A.
Enitecnologie S.p.A.
대리인 / 주소
Oblon, Spivak, McClelland, Maier &
인용정보
피인용 횟수 :
2인용 특허 :
6
초록▼
A process is described for reducing the production of water in oil wells, with temperatures of up to (90째 C.), which comprises the injection in the formation around the well of an aqueous solution of one or more polymers selected from those having general formula (I) wherein: n ranges from (0. 40)
A process is described for reducing the production of water in oil wells, with temperatures of up to (90째 C.), which comprises the injection in the formation around the well of an aqueous solution of one or more polymers selected from those having general formula (I) wherein: n ranges from (0. 40) to (0.70), preferably from (0.5) to (0.65); m ranges from (0.15) to (0.65), preferably from (0.3) to (0.5); p ranges from (0. 02) to (0.20), preferably from (0.05) to (0.10); n+m+p=1; x1 is selected from H and CH3; R1, R2 the same or different, are selected from C1-C10 monofunctional hydrocarbyl groups
대표청구항▼
The invention claimed is: 1. A process for reducing the production of water in an oil well, comprising: injecting into a formation around the well an aqueous solution of one or more polymers of formula (I): wherein n is from 0.40 to 0.70; m is from 0.15 to 0.65; p is from 0.02 to 0.20; n+m+p =1;
The invention claimed is: 1. A process for reducing the production of water in an oil well, comprising: injecting into a formation around the well an aqueous solution of one or more polymers of formula (I): wherein n is from 0.40 to 0.70; m is from 0.15 to 0.65; p is from 0.02 to 0.20; n+m+p =1; X1 is selected from the group consisting of H and CH3; R1, R2, may be the same or different C1-10 monofunctional hydrocarbyl groups. 2. The process according to claim 1, wherein n is from 0.5 to 0.65, m is from 0.3 to 0.5, and p is from 0.5 to 0.10. 3. The process according to claim 1, wherein R1, R2, may be the same or different C1-3 monofunctional alkyl radicals. 4. The process according to claim 3, wherein R1═ R2═CH3. 5. The process according to claim 1, wherein the polymer of formula (I) has a molecular weight of from 1.5 to 12 million. 6. The process according to claim 1, wherein the concentration of the polymer of formula (I) in the aqueous solution is from 300 to 10000 ppm. 7. The process according to claim 6, wherein the concentration of the polymer of formula (I) in the aqueous solution is from 500 to 4000 ppm. 8. The process according to claim 1, wherein the polymer of formula (I) n=0.65, m=0.30, p=0.05, X1═H, and R1 ═R2═CH3. 9. The process according to claim 1, further comprising: first preflushing the formation. 10. The process according to claim 9, wherein the preflushing is carried out by injecting an aqueous solution containing a surface-active agent into the formation. 11. The process according to claim 1, further comprising: overflushing after the injecting. 12. The process according to claim 11, wherein the overflushing includes injecting at least one of a brine, a gas, and an oil, in the formation. 13. The process of claim 1, wherein the aqueous solution has a viscosity of 1.5 to 10 cP. 14. The process of claim 1, further comprising: after the injecting, closing the well to adsorb the polymer in a rock matrix. 15. The process of claim 1, wherein the temperature of the formation is up to 90째 C. 16. The process of claim 1, wherein the aqueous solution comprises a terpolymer comprising a copolymerized units of acrylamide, N-vinylpyrrolidone, and diallyldimethylammoniumchloride. 17. The process of claim 16, wherein the polymer has a molecular weigh of about 5 million. 18. The process of claim 1, further comprising: before the injecting, preflushing the well with an aqueous solution containing a surface active agent; after the injecting, overfiushing the well with at least one of a brine, a gas and an oil; and then closing the well to adsorb the polymer on the formation. 19. The process of claim 1, wherein the formation contains siliceous sand. 20. The process of claim 1, wherein the aqueous solution is injected as rapidly as possible at a pressure that is not higher than the fracture pressure of the formation.
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이 특허에 인용된 특허 (6)
Dawson Jeffrey C. ; Le Hoang V. ; Kesavan Subramanian, Compositions and methods for selective modification of subterranean formation permeability.
Pusch Gnter (Celle DEX) Ranjbar Mohammad (Clausthal-Zellerfeld DEX), Method for reducing or completely stopping the influx of water in boreholes for the extraction of oil and/or hydrocarbon.
Sherwood Nancy S. (Coraopolis PA) Costello Christine A. (Coraopolis PA) Matz Gary F. (Pitcairn PA), Use of polyampholytes to enhance oil and/or gas recovery.
Reinhard J. Oswald AT; Roman Morschhauser DE; Karl Heinz Heier DE; Aranka Tardi DE; Juergen Tonhauser DE; Christoph Kayser DE; Dan Patterson, Water-soluble copolymers and their use for exploration and production of petroleum and natural gas.
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