CN105018064A - Foam oil-displacing agent for high salinity and ultra-low permeability or tight oil reservoirs - Google Patents
Foam oil-displacing agent for high salinity and ultra-low permeability or tight oil reservoirs Download PDFInfo
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- CN105018064A CN105018064A CN201510374805.7A CN201510374805A CN105018064A CN 105018064 A CN105018064 A CN 105018064A CN 201510374805 A CN201510374805 A CN 201510374805A CN 105018064 A CN105018064 A CN 105018064A
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- oil
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- displacing agent
- formation water
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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Abstract
The invention relates to a foam oil-displacing agent for high salinity and ultra-low permeability or tight oil reservoirs in oil field foam flooding of petroleum enterprises. The foam oil-displacing agent can overcome the circumstance of poor salt resistance of existing surfactant flooding systems. According to a technical proposal, the raw materials for preparation of the foam oil-displacing agent include, by mass, 0.2-0.3g of sodium lauryl diphenyl ether disulfonate serving as the surfactant 1, 0.1-0.2g of alkylphenol ethoxylates or fatty alcohol-polyoxyethylene ether serving as the surfactant 2, 0.4-0.6g of anhydrous ethanol serving as the assistant, and 99.0-99.2g of simulated formation water or oilfield formation water. The preparation method includes: firstly adding the high salinity simulated formation water or oilfield formation water into a beaker, under a stirring state, adding the surfactant 1 and surfactant 2, and finally adding anhydrous ethanol, and conducting dissolving stirring for 30min to obtain the transparent foam oil-displacing agent. The oil-displacing agent is alkali-free, avoids destruction to the oil layer, is conducive to improving the foaming performance and foam stabilization performance of the surfactants, has very strong salt resistance, and can be used for chemical-flooding oil production of oil products.
Description
Technical field
The present invention relates to the foam flooding finish for high salinity Oil in Super-low Permeability or compact oil reservoir in a kind of oil play oil field foam flooding, belong to the chemical processing agent that oil field uses.
Background technology
Oil, as a kind of strategic resource, occupies vital role in the national economic development.At present, the workable reserve of high permeable cement greatly reduces, and the exploitation of Oil in Super-low Permeability or compact oil reservoir obtains the attention of people.China's ultra-low penetration or distributed areas, fine and close oil field are wide, and Oil Reservoir Types is many, and oil-containing is many, in explored reserves, ultra-low penetration or compact oil reservoir reserves proportion very high, potentiality to be exploited is huge.(salinity is 4 ~ 8 × 10 to there is a large amount of hypersalinity Oil in Super-low Permeabilities or compact oil reservoir for Changqing oilfields and Yanchang Oilfield
4between mg/L and rate of permeation 0.01 ~ 1 × 10
-3μm
2between), some oily district has arrived and has had to take the method improving recovery ratio to improve crude production rate.The method of usual raising oil recovery factor has the chemical flooding methods such as polymer flooding, caustic waterflooding, surfactant flooding, and foam flooding is that one extremely effectively exploits means for ultra-low penetration or fine and close oil field.In foam flooding system, the pore forming material existed is generally tensio-active agent, it has hydrophilic and hydrophobic molecular structure, the interfacial tension of the aqueous solution and the crude oil injected is reduced, increase displacement efficiency, and foam there are high resistance coefficient and low residual resistance factor, has significant transfer drive ability, improve sweep efficiency, thus reach the effect promoting oil displacement efficiency.General not with suds-stabilizing agent in Oil in Super-low Permeability or fine and close oil field foam flooding, mainly because suds-stabilizing agent is generally polymkeric substance or inorganic powder particle material, all may block submicron and the nano level pore throat of Oil in Super-low Permeability or compact oil reservoir, make follow-up injection working fluid difficulty.
Be 4 ~ 8 × 10 for salinity
4mg/L and rate of permeation are 0.01 ~ 1 × 10
-3μm
2high salinity Oil in Super-low Permeability or compact oil reservoir, conventional chemical flooding is difficult to the condition meeting high salinity Oil in Super-low Permeability or the compact oil reservoir displacement of reservoir oil.In order to solve the problem, have studied the foam flooding flooding system of applicable high salinity Oil in Super-low Permeability or compact oil reservoir, provide solution for improving oil recovery rate, there are good economic benefits.The tensio-active agent now commercially existed is more, as mainly anionic sulphonate and the carboxylate salt of the displacement of reservoir oil, and nonionogenic tenside etc.Anion surfactant interfacial activity is high, and temperature tolerance is good, but salt tolerance is poor, and nonionogenic tenside salt resistance is good, but poor stability in the earth formation, and not heatproof, meanwhile, single special surface promoting agent does not reach the requirement needed for oilfield exploitation yet, and expensive.Therefore, need one or more can under high salinity ultra-low penetration or compact oil reservoir environment, all on sale in market and the relative low price of each component, whipability is good, and rock absorption is few, good stability, synergy obviously, obviously can reduce the oil-displacing agent of oil water interfacial tension and increase oil displacement efficiency.
Summary of the invention
The object of the invention is: for the situation that usual foam system anti-salt property is poor, spy provides a kind of foam flooding finish for high salinity Oil in Super-low Permeability or compact oil reservoir.This oil-displacing agent reaches 4 ~ 8 × 10 in salinity
4the oil reservoir of mg/L, and under alkali-free condition, foam volume is greater than 630mL, half foam life period is greater than 360s, good with local water compatibleness, and the aqueous solution obtaining oil-displacing agent is transparent, without precipitation.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of foam flooding finish for high salinity Oil in Super-low Permeability or compact oil reservoir, is characterized in that: preparing the raw materials used and each component concentration of this foam flooding finish is, the unit of its quality is gram,
Tensio-active agent 1: be with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate 0.2 ~ 0.3;
Tensio-active agent 2: be the one 0.1 ~ 0.2 by alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether;
Auxiliary agent: dehydrated alcohol 0.4 ~ 0.6;
Simulated formation water or oil field stratum water 99.0 ~ 99.2;
Tensio-active agent 1 is with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, its alkyl is the straight chained alkyl of 12 carbonatomss, tensio-active agent 2 is by the one in alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether, the ethoxy group numbers of described tensio-active agent 2 is between 9 ~ 20, alkyl in alkylphenol is nonyl or octyl group, and the carbonatoms of the fat alkane chain of fatty alcohol-polyoxyethylene ether is the one of 10 or 12 or 14 or 16.
Its preparation method is: first add in beaker by simulated formation water or oil field stratum water 99.0 ~ 99.2g, under the state stirred, add 0.2 ~ 0.3g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate again, then the one of 0.1 ~ 0.2g alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether is added, finally add 0.4 ~ 0.6g dehydrated alcohol, dissolve this foam flooding finish obtained transparent after stirring 30min.First the present invention has obtained the composite oil-displacing agent being suitable for high salinity ultra-low penetration or compact oil reservoir, has following beneficial effect: 1, this oil-displacing agent system is without the need to any alkali, avoids the destruction of alkali to oil field stratum and oil well; 2, in this oil-displacing agent system due to the existence of oxyethylene group group, contribute to tensio-active agent foam performance and foam stability can raising; The existence of sulfonate radical, makes it have very strong saline-alkaline tolerance and heat resistance; 3, the compatibleness of the local water of this oil-displacing agent and high salinity is good, and foaming properties is unaffected, good stability, shop experiment, and bubble volume is greater than 630mL, and the transformation period is greater than 360s.
The foam volume of oil-displacing agent of the present invention, transformation period, oil displacement efficiency measuring method are as follows:
The oil-displacing agent system prepared is prepared foam with 4000r/min rapid stirring 60s on high speed foaming instrument, then the foam obtained is poured into rapidly in graduated cylinder, read lather volume, be foam volume; Start timing simultaneously, when the lather volume in graduated cylinder is a half of initial foam value, record the time consumed, be the transformation period of this flooding system foam.
Single core experiment and two core experiment oil displacement efficiency test procedure: 1, with simulated formation water, rock core is saturated, record import and export terminal pressure, until pressure reduction is stablized.2, inject Simulation of Crude Oil until anhydrously to displace, make crude oil fully saturated, record aquifer yield.3, simulated formation water displace crude oil is injected, until water saturation reaches 98%, record water drive oil mass.4, inject 0.5PV foaming liquid, then inject 10PV simulated formation water, foam color fades to white by black, record oil pump capacity.The back pressure that above-mentioned flowing experiment process is set up is 5.6MPa.Calculate the oil displacement efficiency of foam flooding.
Embodiment
Below by example 1 ~ 5, the present invention is described, but content of the present invention is not only confined to the following examples.
Embodiment 1
First add in beaker by simulated formation water or oil field stratum water 99.0g, its total mineralization is 4 × 10
4mg/L (sodium-chlor 2.5 × 10
4mg/L+ Repone K 1.2 × 10
4mg/L+ calcium chloride 0.3 × 10
4mg/L).Under the state stirred, then add 0.2g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, then add 0.2g polyoxyethylene octylphenol ether, finally add 0.6g dehydrated alcohol, dissolve after stirring 30min, obtained transparent, nothing precipitation foam flooding finish, measuring its foam volume is 665mL, and the transformation period is 360s.Be 80 DEG C in temperature, salinity 4 × 10
4mg/L, drill core permeability rate is 0.986 × 10
-3μm
2condition under, adopt single core oil displacement experiment, foam flooding oil displacement efficiency is 14.9%.
Embodiment 2
First add in beaker by simulated formation water or oil field stratum water 99.0g, its total mineralization is 8 × 10
4mg/L (sodium-chlor 5 × 10
4mg/L+ Repone K 2.5 × 10
4mg/L+ calcium chloride 0.5 × 10
4mg/L).Under the state stirred, then add 0.2g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, then add 0.2g polyoxyethylene octylphenol ether, finally add 0.6g dehydrated alcohol, dissolve after stirring 30min, obtained transparent, nothing precipitation foam flooding finish, measuring its foam volume is 641mL, and the transformation period is 401s.Be 65 DEG C in temperature, salinity 8 × 10
4mg/L, drill core permeability rate is 0.012 × 10
-3μm
2under condition, adopt single core oil displacement experiment, foam flooding oil displacement efficiency is 17.1%.
Embodiment 3
First add in beaker by simulated formation water or oil field stratum water 99.0g, its total mineralization is 6 × 10
4mg/L (sodium-chlor 4 × 10
4mg/L+ Repone K 1.5 × 10
4mg/L+ calcium chloride 0.5 × 10
4mg/L).Under the state stirred, then add 0.25g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, then add 0.15g Dodecyl Polyoxyethylene Ether, finally add 0.6g dehydrated alcohol, dissolve after stirring 30min, obtained transparent, nothing precipitation foam flooding finish, measuring its foam volume is 630mL, and the transformation period is 362s.Be 50 DEG C in temperature, salinity 6 × 10
4mg/L, drill core permeability rate are 0.114 × 10
-3μm
2under condition, adopt single core oil displacement experiment, foam flooding oil displacement efficiency is 15.8%.
Embodiment 4
First add in beaker by simulated formation water or oil field stratum water 99.0g, its total mineralization is 4 × 10
4mg/L (sodium-chlor 2.5 × 10
4mg/L+ Repone K 1.2 × 10
4mg/L+ calcium chloride 0.3 × 10
4mg/L).Under the state stirred, then add 0.3g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, then add 0.1g Dodecyl Polyoxyethylene Ether, finally add 0.6g dehydrated alcohol, dissolve after stirring 30min, obtained transparent, nothing precipitation foam flooding finish, measuring its foam volume is 695mL, and the transformation period is 421s.Be 50 DEG C in temperature, salinity 4 × 10
4mg/L, adopt two core flooding experiment, the saturating rate of infiltration that height oozes core is 0.905 × 10
-3μm
2, the rate of permeation of Low-permeable Cores is 0.021 × 10
-3μm
2, rate of permeation extreme difference reaches 43.1 times, and two core foam flooding oil displacement efficiency is 18.3%.
Embodiment 5
First add in beaker by simulated formation water or oil field stratum water 99.0g, its total mineralization is 8 × 10
4mg/L (sodium-chlor 5 × 10
4mg/L+ Repone K 2.5 × 10
4mg/L+ calcium chloride 0.5 × 10
4mg/L).Under the state stirred, then add 0.3g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, then add 0.1g Dodecyl Polyoxyethylene Ether, finally add 0.6g dehydrated alcohol, dissolve after stirring 30min, obtained transparent, nothing precipitation foam flooding finish, measuring its foam volume is 650mL, and the transformation period is 415s.Be 80 DEG C in temperature, salinity 8 × 10
4mg/L, adopt two core flooding experiment, the rate of permeation that height oozes core is 0.642 × 10
-3μm
2, the rate of permeation of Low-permeable Cores is 0.0618 × 10
-3μm
2, rate of permeation extreme difference 10.4 times, two core foam flooding oil displacement efficiency is 17.3%.
Claims (3)
1., for a foam flooding finish for high salinity Oil in Super-low Permeability or compact oil reservoir, it is characterized in that: prepare this oil-displacing agent raw material used and each component concentration as follows, wherein the unit of quality is gram,
Tensio-active agent 1: be with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate 0.2 ~ 0.3;
Tensio-active agent 2: be the one 0.1 ~ 0.2 by alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether;
Auxiliary agent: dehydrated alcohol 0.4 ~ 0.6;
Simulated formation water or oil field stratum water: 99.0 ~ 99.2;
Its preparation method is: first add in beaker by simulated formation water or oil field stratum water 99.0 ~ 99.2g, under the state stirred, add 0.2 ~ 0.3g disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate again, then the one of 0.1 ~ 0.2g alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether is added, finally add 0.4 ~ 0.6g dehydrated alcohol, dissolve this foam flooding finish obtained transparent after stirring 30min.
2. foam flooding finish according to claim 1, is characterized in that: described tensio-active agent 1 is that its atomic number of alkyl carbon is the straight chained alkyl of 12 with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate.
3. foam flooding finish according to claim 1, is characterized in that: described tensio-active agent 2 is by the one in alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether, and the ethoxy group numbers of its tensio-active agent 2 selected is between 9 ~ 20; Alkyl in alkylphenol is nonyl or octyl group; The carbonatoms of the fat alkane chain of fatty alcohol-polyoxyethylene ether is the one of 10 or 12 or 14 or 16.
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Cited By (8)
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|---|---|---|---|---|
| CN108485631A (en) * | 2018-05-14 | 2018-09-04 | 中国日用化学研究院有限公司 | A kind of non-base oil-displacing agent and preparation method of high temperature resistant and high salinity |
| CN109415621A (en) * | 2016-07-12 | 2019-03-01 | 陶氏环球技术有限责任公司 | The foaming and molding composition of oil recycling is assisted for steam |
| CN110818208A (en) * | 2019-10-31 | 2020-02-21 | 麦王环境技术股份有限公司 | Oil-water-solid three-phase separation cleaning agent for oily sludge and preparation method thereof |
| CN111204941A (en) * | 2020-01-14 | 2020-05-29 | 麦王环境技术股份有限公司 | Treatment process of bagged high-viscosity oily sludge |
| CN112877051A (en) * | 2021-02-09 | 2021-06-01 | 山东达维石油技术有限公司 | Compact oil reservoir phase-permeation profile control agent and preparation method thereof |
| CN114641553A (en) * | 2019-10-10 | 2022-06-17 | 陶氏环球技术有限责任公司 | Method and composition for enhanced oil recovery |
| CN115895635A (en) * | 2023-02-13 | 2023-04-04 | 河北工业职业技术学院 | Fracturing fluid oil displacement agent and fracturing fluid |
| CN116948618A (en) * | 2022-04-20 | 2023-10-27 | 中国石油化工集团有限公司 | Sand washing composition and sand washing liquid |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109415621A (en) * | 2016-07-12 | 2019-03-01 | 陶氏环球技术有限责任公司 | The foaming and molding composition of oil recycling is assisted for steam |
| CN108485631A (en) * | 2018-05-14 | 2018-09-04 | 中国日用化学研究院有限公司 | A kind of non-base oil-displacing agent and preparation method of high temperature resistant and high salinity |
| CN114641553A (en) * | 2019-10-10 | 2022-06-17 | 陶氏环球技术有限责任公司 | Method and composition for enhanced oil recovery |
| CN114641553B (en) * | 2019-10-10 | 2023-11-28 | 陶氏环球技术有限责任公司 | Methods and compositions for enhanced oil recovery |
| CN110818208A (en) * | 2019-10-31 | 2020-02-21 | 麦王环境技术股份有限公司 | Oil-water-solid three-phase separation cleaning agent for oily sludge and preparation method thereof |
| CN110818208B (en) * | 2019-10-31 | 2022-02-25 | 麦王环境技术股份有限公司 | Oil-water-solid three-phase separation cleaning agent for oily sludge and preparation method thereof |
| CN111204941A (en) * | 2020-01-14 | 2020-05-29 | 麦王环境技术股份有限公司 | Treatment process of bagged high-viscosity oily sludge |
| CN112877051A (en) * | 2021-02-09 | 2021-06-01 | 山东达维石油技术有限公司 | Compact oil reservoir phase-permeation profile control agent and preparation method thereof |
| CN112877051B (en) * | 2021-02-09 | 2022-09-02 | 山东达维石油技术有限公司 | Compact oil reservoir phase-permeation profile control agent and preparation method thereof |
| CN116948618A (en) * | 2022-04-20 | 2023-10-27 | 中国石油化工集团有限公司 | Sand washing composition and sand washing liquid |
| CN115895635A (en) * | 2023-02-13 | 2023-04-04 | 河北工业职业技术学院 | Fracturing fluid oil displacement agent and fracturing fluid |
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Application publication date: 20151104 |