CN102312666B - Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir - Google Patents
Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir Download PDFInfo
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- CN102312666B CN102312666B CN201010227128.3A CN201010227128A CN102312666B CN 102312666 B CN102312666 B CN 102312666B CN 201010227128 A CN201010227128 A CN 201010227128A CN 102312666 B CN102312666 B CN 102312666B
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Abstract
The invention relates to a method for improving the oil-water displacement recovery ratio of a low-permeable oil reservoir, which comprises the following steps of: preparing a mixed aqueous solution containing 400-4000mg/L of surfactant and 200-2000mg/L of foam stabilizer from the surfactant, the foam stabilizer and water; and mixing the mixed aqueous solution and a gas according to a volume ratio of the solution to the gas of 1: (0.1-2), and injecting into the oil reservoir through a water injection well, wherein the injection time is 90-120 days. The surfactant is selected from one or two of branched sodium alkybenzenesulfonate, alkyl polyoxyethylene ether sodium sulfate, alkyl polyoxyethylene ether sodium carboxylate, fatty alcohol ether sodium sulfate and cocoamido propyl hydroxy sulfobetaine; the foam stabilizer is sodium carboxymethylcellulose; and the gas is air. According to the invention, after the water content of the extracted solution reaches 60 percent, the oil displacement efficiency is improved by 20 percent compared with waterflooding, and the water content is reduced by 13-27 percent.
Description
Technical field:
The present invention relates to a kind of extra-low permeability (permeability 1～10 * 10
-3um
2) the steady oil control of high water-cut stage water (or oil increasing precipitation) in waterflooding oil field, improve water drive oil effect, improve the method for waterflood recovery efficiency factor.
Background technology
Extra-low permeability low pressure reservoirs permeability is low by (1～10 * 10
-3um
2), formation pressure low (pressure coefficient 0.7 left and right), adopts waterflooding extraction mode.Enter high water-cut development after date in oil field, around how improving water drive oil effect, raising well yield, steady oil control water (or oil increasing precipitation), improving reservoir water drive recovery ratio, be the problem that oil field development technician studies tackling key problem always.
The existing waterflooding extraction mode of extra-low permeability waterflooding reservoir, waterflood recovery efficiency factor, below 25%, still has a large amount of oils in place cannot be converted into crude output, causes the huge waste of petroleum resources.Polymer flooding is at present comparatively advanced raising recovery efficiency technique, can improve recovery ratio more than 10%, but still have a large amount of crude oil stay underground cannot extraction, and it can only be greater than 50 * 10 for permeability
-3um
2medium to high permeable oil reservoir, be not suitable for extra-low permeability oil reservoirs, how improving extra-low permeability waterflooding reservoir water drive oil effect, improving reservoir water drive recovery ratio is a very difficult job, in the urgent need to researching and developing new technical method.
Summary of the invention
The object of this invention is to provide a kind of injection good, stability is good, the composite air foam that surface-active is high, high water-cut stage in extra-low permeability waterflooding oil field, it is injected to oil reservoir from water injection well, effectively improve the method for the raising extra-low permeability oil reservoirs water drive oil recovery ratio of water drive oil effect, steady oil control water (or oil increasing precipitation).
The method of raising oil-water displacement recovery ratio of low-permeable oil reservoir of the present invention, is characterized in that:
A. first surfactant, foam stabiliser and water are mixed with to the mixed aqueous solution containing surfactant 400～4000mg/L, foam stabiliser 200～2000mg/L.
B. by mixed aqueous solution according to liquid: gas=1: the ratio of (0.1～2) (subsurface volume) is mixed by water injection well and injected oil reservoir simultaneously, injection length is 90～120 days.
C. the described surfactant of this invention is one or both in sodium branched alkyl benzene sulfonate, alkyl polyoxyethylene ether sodium sulphate, Alkyl ethoxy carboxylate acid sodium, fatty alcohol-ether sodium sulfate, coconut oil amido propyl hydroxyl sulphur betaine.The described foam stabiliser of this invention is that one or both and other foam stabilizing additive in sanlose, polyacrylamide forms.
D. the described gas of this invention is air.
Effect of the present invention is to show in the laboratory core displacement experiment result of carrying out, and the moisture 60% rear water drive that reaches of production fluid proceeds to after compound air gas drive foam, and oil displacement efficiency improves 20% compared with filled drive, moisture content decline 13-27%.The individual well that has carried out 1 mouthful of well injects field trial, the corresponding oil well rate 73.6% that takes effect, individual well day produce oil by 1.3t, rise to 3.5t, moisturely drop to 63.4% by 79.8%, on-the-spot application has obtained obvious effect.
The specific embodiment
Embodiment 1
A. alkyl polyoxyethylene ether sodium sulphate, sanlose, coconut oil amido propyl hydroxyl sulphur betaine and water are mixed with to the mixed aqueous solution containing alkyl polyoxyethylene ether sodium sulphate 2000mg/L, coconut oil amido propyl hydroxyl sulphur betaine 1000mg/L, sanlose 2000mg/L.
B. according to mixed aqueous solution: air=1: the ratio mixing of 1 (subsurface volume) is injected oil reservoir by water injection well simultaneously.
C. total injection rate of mixed aqueous solution and air (subsurface volume) is 5000m
3, injection length is 90～120 days, also can inject continuously.Recovery water filling after injection completes, after general water filling well group takes effect, the corresponding average individual well amount of increase in production of producing well is 30%, and period of validity was over 6 months.
The method of raising oil-water displacement recovery ratio of low-permeable oil reservoir of the present invention, is applicable to Reservoir Permeability 1～10 * 10
-3um
2, reservoir temperature is not higher than 70 ℃, and formation water salinity is lower than 60000mg/L, and calcium ions and magnesium ions concentration is lower than 10000mg/L, and oil viscosity is lower than the oil reservoir of 10mPa.s.During use, according to the analysis to oilfield reservoir feature, characteristic of fluid, water flooding feature, by laboratory test, adjust composite air foam solution: the ratio of gas and total injection rate.
Embodiment 2
A. Alkyl ethoxy carboxylate acid sodium, sanlose, coconut oil amido propyl hydroxyl sulphur betaine and water are mixed with to the mixed aqueous solution containing Alkyl ethoxy carboxylate acid sodium 2000mg/L, coconut oil amido propyl hydroxyl sulphur betaine 1000mg/L, polyacrylamide 1500mg/L.
B. according to mixed aqueous solution: air=1: the ratio mixing of 0.5 (subsurface volume) is injected oil reservoir by water injection well simultaneously.
C. total injection rate of mixed aqueous solution and air (subsurface volume) is 5000m
3, injection length is 120 days, injects continuously.Recovery water filling after injection completes, after general water filling well group takes effect, the corresponding average individual well amount of increase in production of producing well is 30%, and period of validity was over 6 months.
The method of raising oil-water displacement recovery ratio of low-permeable oil reservoir of the present invention, is applicable to Reservoir Permeability 1～10 * 10
-3um
2, reservoir temperature is not higher than 70 ℃, and formation water salinity is lower than 60000mg/L, and calcium ions and magnesium ions concentration is lower than 10000mg/L, and oil viscosity is lower than the oil reservoir of 10mPa.s.During use, according to the analysis to oilfield reservoir feature, characteristic of fluid, water flooding feature, by laboratory test, adjust composite air foam solution: the ratio of gas and total injection rate.
Embodiment 3
A. fatty alcohol-ether sodium sulfate, sanlose, coconut oil amido propyl hydroxyl sulphur betaine and water are mixed with to the mixed aqueous solution of fatty alcohol ether sodium sulfate 2000mg/L, coconut oil amido propyl hydroxyl sulphur betaine 1000mg/L, polyacrylamide 1500mg/L.
B. according to mixed aqueous solution: air=1: the ratio mixing of 0.1 (subsurface volume) is injected oil reservoir by water injection well simultaneously.
C. total injection rate of mixed aqueous solution and air (subsurface volume) is 5000m
3, injection length is 90～120 days, also can inject continuously.Recovery water filling after injection completes, after general water filling well group takes effect, the corresponding average individual well amount of increase in production of producing well is 30%, and period of validity was over 6 months.
The method of raising oil-water displacement recovery ratio of low-permeable oil reservoir of the present invention, is applicable to Reservoir Permeability 1～10 * 10
-3um
2, reservoir temperature is not higher than 70 ℃, and formation water salinity is lower than 60000mg/L, and calcium ions and magnesium ions concentration is lower than 10000mg/L, and oil viscosity is lower than the oil reservoir of 10mPa.s.During use, according to the analysis to oilfield reservoir feature, characteristic of fluid, water flooding feature, by laboratory test, adjust composite air foam solution: the ratio of gas and total injection rate.
Embodiment 4
A. sodium branched alkyl benzene sulfonate, sanlose, coconut oil amido propyl hydroxyl sulphur betaine and water are mixed with to the mixed aqueous solution containing alkyl polyoxyethylene ether sodium sulphate 2000mg/L, coconut oil amido propyl hydroxyl sulphur betaine 1000mg/L, polyacrylamide 1250mg/L.
B. according to mixed aqueous solution: air=1: the ratio mixing of 1.5 (subsurface volumes) is injected oil reservoir by water injection well simultaneously.
C. total injection rate of mixed aqueous solution and air (subsurface volume) is 5000m
3, injection length is 90～120 days, also can inject continuously.Recovery water filling after injection completes, after general water filling well group takes effect, the corresponding average individual well amount of increase in production of producing well is 30%, and period of validity was over 6 months.
The method of raising oil-water displacement recovery ratio of low-permeable oil reservoir of the present invention, is applicable to Reservoir Permeability 1～10 * 10
-3um
2, reservoir temperature is not higher than 70 ℃, and formation water salinity is lower than 60000mg/L, and calcium ions and magnesium ions concentration is lower than 10000mg/L, and oil viscosity is lower than the oil reservoir of 10mPa.s.During use, according to the analysis to oilfield reservoir feature, characteristic of fluid, water flooding feature, by laboratory test, adjust composite air foam solution: the ratio of gas and total injection rate.
Claims (2)
1. a method that improves oil-water displacement recovery ratio of low-permeable oil reservoir, is characterized in that:
A. alkyl polyoxyethylene ether sodium sulphate, sanlose, coconut oil amido propyl hydroxyl sulphur betaine and water are mixed with to the mixed aqueous solution containing alkyl polyoxyethylene ether sodium sulphate 2000mg/L, coconut oil amido propyl hydroxyl sulphur betaine 1000mg/L, sanlose 2000mg/L;
B. according to the ratio of subsurface volume mixed aqueous solution: air=1:1, mix and by water injection well, inject oil reservoir simultaneously;
C. total injection rate of subsurface volume mixed aqueous solution and air is 5000m
3, injection length is 90～120 days, has injected rear recovery water filling, and after general water filling well group takes effect, the corresponding average individual well amount of increase in production of producing well is 30%, and period of validity was over 6 months;
Said method is applicable to Reservoir Permeability 1～10 * 10
-3um
2reservoir temperature is not higher than 70 ℃, formation water salinity is lower than 60000mg/L, calcium ions and magnesium ions concentration is lower than 10000mg/L, oil viscosity is lower than the oil reservoir of 10mPa.s, during use, according to the analysis to oilfield reservoir feature, characteristic of fluid, water flooding feature, by laboratory test, adjust composite air foam solution: the ratio of gas and total injection rate.
2. method according to claim 1, is characterized in that: described in be injected to continuous injection.
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| CN201010227128.3A CN102312666B (en) | 2010-07-06 | 2010-07-06 | Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir |
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| CN201010227128.3A CN102312666B (en) | 2010-07-06 | 2010-07-06 | Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir |
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| CN102312666B true CN102312666B (en) | 2014-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106479470A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Improve low-tension foaming agent and the flooding method of heterogeneous reservoir oil recovery factor |
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| CN102838971A (en) * | 2012-08-17 | 2012-12-26 | 中国石油天然气股份有限公司 | Foaming agent special for huff and puff of rocket power compound heat carrier |
| CN103773351B (en) * | 2012-10-25 | 2017-10-27 | 中国石油化工股份有限公司 | High salinity reservoir gas drive foam compositions and preparation method and purposes |
| CN103965845B (en) * | 2013-02-05 | 2017-04-12 | 中国石油化工股份有限公司 | Flushing fluid for cementing of horizontal shale gas well |
| CN104099077B (en) * | 2013-10-28 | 2018-04-10 | 中国石油化工股份有限公司 | A kind of high salinity reservoirs compound oil displacement agent |
| CN103834379B (en) * | 2014-01-03 | 2016-09-07 | 中国石油大学(华东) | A kind of vermiculate glues foam system and the method improving recovery ratio with it |
| CN104893703A (en) * | 2015-05-26 | 2015-09-09 | 西南石油大学 | Low-solidifying-point foaming agent for oilfield operation |
| CN106281284B (en) * | 2015-06-08 | 2018-12-21 | 中国石油化工股份有限公司 | A kind of foam flooding foaming agent and preparation method thereof |
| CN106497534B (en) * | 2016-08-31 | 2019-06-28 | 西南石油大学 | A kind of strengthening foam system constructed by nano-cellulose |
| CN110791272A (en) * | 2018-08-02 | 2020-02-14 | 中国石油化工股份有限公司 | Temperature-resistant salt-tolerant microbial fermentation broth foam system and preparation method thereof |
| CN112943192A (en) * | 2021-02-03 | 2021-06-11 | 中国石油天然气股份有限公司 | Mining method suitable for low-permeability conglomerate oil reservoir |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4008165A (en) * | 1975-03-14 | 1977-02-15 | Texaco Inc. | Surfactant oil recovery process usable in high temperature formations having high concentrations of polyvalent ions |
| GB2205122B (en) * | 1987-05-28 | 1991-09-11 | Chevron Res | Steam or gas enhanced oil recovery method |
| CN100591742C (en) * | 2005-01-07 | 2010-02-24 | 中国石化胜利油田有限公司地质科学研究院 | Method of raising oil deposit crude petroleum recovery ratio |
| CN101493006B (en) * | 2009-02-23 | 2012-05-09 | 中国海洋石油总公司 | Method for controlling bottom water coning by foam |
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| CN106479470A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Improve low-tension foaming agent and the flooding method of heterogeneous reservoir oil recovery factor |
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