CN111019624A - Preparation and application of nano microemulsion for oil displacement - Google Patents
Preparation and application of nano microemulsion for oil displacement Download PDFInfo
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Abstract
The invention relates to the technical field of oil displacement in oilfield exploitation, in particular to preparation and application of nano microemulsion for oil displacement, which comprises the following raw materials in parts by weight: 30-65 parts of an organic silicon surfactant; 25-45 parts of deionized water; 5-15 parts of one or more alcohols with 1-8 carbon atoms; 3-8 parts of carboxylate composite emulsifier; 2-6 parts of an emulsification aid; 1-5 parts of water-soluble temperature-resistant salt-resistant agent. The preparation process comprises the steps of oil phase preparation, water phase preparation, mixing of the oil phase and the water phase and the like. The nano microemulsion for oil displacement can form ultralow interfacial tension with crude oil, so that the recovery ratio of petroleum is greatly improved; in addition, the oil displacement agent is not easy to be adsorbed and eluted in the oil displacement process, and the loss of the surfactant is low, so that the oil extraction cost is favorably reduced.
Description
Technical Field
The invention relates to the technical field of oil displacement in oilfield exploitation, in particular to preparation and application of nano microemulsion for oil displacement.
Background
Petroleum is a cheap, efficient and non-renewable natural resource, and plays an irreplaceable role in the aspects of energy, chemical raw materials, national defense strategic materials and the like. The recovery ratio of developed oil fields in China is about 32 percent at present, wherein the average recovery ratio of the oil fields in the east of China on land is relatively high and reaches 35 percent; while the average recovery rate of western oil fields is only about 25 percent, which is far lower than the average water flooding recovery rate level of foreign oil fields. The data show that China still has a large amount of geological reserves remained underground after water flooding and is not developed, and particularly for a large amount of geological reserves in a low seepage or ultra-low seepage oil layer, the method has important industrial value and strategic significance for improving the recovery ratio of the residual oil after water flooding to the maximum extent and effectively developing low-permeability oil fields.
Generally, the process of oil recovery and oil field development can be divided into three distinct phases, ー oil recovery, secondary oil recovery and tertiary oil recovery. Both primary and secondary oil recovery are oil recovery techniques that utilize physical methods. Of these, ー times are self-injection production relying entirely on the natural energy of the formation, typically with an average recovery rate of less than 15%. ニ times of recovery refers to that after the primary oil recovery is finished, namely after the stratum energy is released, the oil recovery rate is about 30% -40%, the water content of the oil field produced liquid is correspondingly gradually increased as the secondary oil recovery approaches the later stage, and the economic benefit of the crude oil recovery is greatly reduced. After secondary Oil Recovery, people adopt different methods to further improve the crude Oil Recovery efficiency, and the adopted new technology is collectively called tertiary Oil Recovery technology, also called Enhanced Oil Recovery (EOR) technology.
Tertiary oil recovery is a new technology of secondary recovery after secondary oil recovery. The tertiary oil recovery technology further improves the recovery ratio by utilizing physical, chemical, biological and other technologies and reduces the saturation of residual oil. Tertiary oil recovery techniques include chemical flooding, gas flooding, thermal flooding, microbial flooding, and the like; wherein, the chemical flooding improves the recovery ratio by injecting chemical agents, and comprises polymer flooding, surfactant flooding, alkali water flooding, ternary combination flooding and the like; the gas flooding comprises mixed-phase or partially-mixed-phase CO2 flooding, nitrogen flooding, natural gas flooding, flue gas flooding and the like; the thermal drive comprises steam drive, steam huff and puff, hot water drive, in-situ combustion and the like; microbial oil recovery includes microbial profile control or microbial oil displacement.
The surfactant oil displacement can make the interfacial tension reach a lower value, thereby greatly improving the recovery ratio of petroleum. However, the surfactant is used in a large amount, and adsorption loss in the formation is large, thereby increasing oil recovery costs and having low economic benefits.
Based on the nano microemulsion, the invention provides the nano microemulsion for oil displacement, and aims to solve the problems in the prior art.
Disclosure of Invention
The invention provides a preparation method and application of nano microemulsion for oil displacement, and the nano microemulsion for oil displacement can form ultralow interfacial tension with crude oil, so that the recovery ratio of petroleum is greatly improved; in addition, the oil displacement agent is not easy to be adsorbed and eluted in the oil displacement process, and the loss of the surfactant is low, so that the oil extraction cost is favorably reduced.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of nano microemulsion for oil displacement, which comprises the following raw materials in parts by weight:
A) 30-65 parts of an organic silicon surfactant;
B) 25-45 parts of deionized water;
C) 5-15 parts of one or more alcohols with 1-8 carbon atoms;
D) 3-8 parts of carboxylate composite emulsifier;
E) 2-6 parts of an emulsification aid;
F) 1-5 parts of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding the alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 0.5-1.5h at the normal temperature and the rotation speed of 500-;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: adding the prepared water phase into the oil phase, stirring for 3-5h at the temperature of 60-90 ℃ and the rotating speed of 800-1200r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
In a further embodiment of the invention, the nano microemulsion for oil displacement comprises the following raw materials in parts by weight:
A) 48 parts of silicone surfactant;
B) 35 parts of deionized water;
C) 10 parts of one or more alcohols with 1-8 carbon atoms;
D) 5.5 parts of carboxylate compound emulsifier;
E) 4 parts of an emulsification aid;
F) 3 parts of water-soluble temperature-resistant salt-resistant agent.
In a further embodiment of the present invention, the silicone surfactant is silicone surfactant FY-S.
In a further embodiment of the invention, the alcohol is a C2-C5 linear or branched alkyl alcohol.
In a further embodiment of the invention, the carboxylate composite emulsifier is composed of a carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant, OP-9 and Span60 is 6:2: 1.
In a further embodiment of the invention, the emulsifying aid is Tween80 and/or sodium dodecyl sulfate.
In a further embodiment of the invention, the HLB value of the emulsification aid is 5-9.
In a further embodiment of the invention, the water-soluble temperature and salt tolerant agent is selected from N-vinyl pyrrolidone.
The invention provides nano microemulsion for oil displacement in a second aspect, which is prepared by any one of the preparation methods.
In addition, the invention also provides application of the nano microemulsion for oil displacement in oil exploitation. Specifically, the nano microemulsion for oil displacement can be used in tertiary oil recovery.
Compared with the prior art, the invention has the following beneficial effects:
(1) the nano microemulsion for oil displacement has a synergistic interaction effect among the components, and can form ultralow interfacial tension with crude oil through the cooperation of an organic silicon surfactant, alcohol, a carboxylate composite emulsifier, an emulsifying aid and a water-soluble temperature-resistant salt-resistant agent, so that the recovery ratio of petroleum is greatly improved; in addition, the nano microemulsion is not easy to be adsorbed and eluted in the oil displacement process, and the loss of the surfactant is low, so that the oil extraction cost is favorably reduced;
(2) according to the invention, the oil-based organic silicon surfactant, the carboxylate composite emulsifier, the alcohol, the water-based emulsification aid and the water-soluble temperature-resistant salt-resistant agent are mutually matched, so that the oil-water interfacial tension and the surface tension can be effectively reduced, the emulsification performance is improved, the adsorption quantity of the surfactant in an oil layer is reduced, and the crude oil recovery rate can be further improved;
(3) according to the invention, the problems of poor temperature resistance and salt resistance and low oil displacement efficiency of the conventional microemulsion for oil displacement under the conditions of high temperature and high salt can be solved by adding the water-soluble temperature-resistant salt-resistant agent, so that the oil displacement efficiency is further improved, the crude oil recovery rate is improved, and the aqueous solution of the microemulsion can form ultralow interfacial tension with the crude oil through the ultrahigh interfacial activity of the water-soluble temperature-resistant salt-resistant agent, so that the cohesion among the crude oils is effectively overcome, the outflow of the crude oil is facilitated, and the oil displacement efficiency is greatly improved;
(4) according to the invention, the organic silicon surfactant and the carboxylate compound emulsifier are compounded, so that the surface tension of oil is lowered, the interfacial tension is reduced, the emulsifying property is enhanced, the crude oil adhered to rock stratum sandstone can be further washed down, and the crude oil recovery rate is improved.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the examples are not intended to limit the present invention.
Example 1
The preparation of the nano microemulsion for oil displacement according to the embodiment is based on the nano microemulsion for oil displacement, and comprises the following raw materials in parts by weight:
A) 30 parts of silicone surfactant;
B) 25 parts of deionized water;
C) 5 parts of one or more alcohols with 1-8 carbon atoms;
D) 3 parts of carboxylate compound emulsifier;
E) 2 parts of an emulsification aid;
F) 1 part of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 0.5h at normal temperature and at the rotating speed of 500r/min to obtain an oil phase;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: adding the prepared water phase into the oil phase, stirring for 3h at the temperature of 60 ℃ and the rotating speed of 800r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
Wherein the organic silicon surfactant is an organic silicon surfactant FY-S.
Wherein the alcohol is n-hexanol.
The carboxylate compound emulsifier consists of a carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant to the OP-9 to the Span60 is 6:2: 1.
Wherein the emulsifying aid is Tween 80.
Wherein the HLB value of the emulsifying aid is 5-9.
Wherein the water-soluble temperature-resistant salt-resistant agent is selected from N-vinyl pyrrolidone.
Example 2
The preparation of the nano microemulsion for oil displacement according to the embodiment is based on the nano microemulsion for oil displacement, and comprises the following raw materials in parts by weight:
A) 65 parts of a silicone surfactant;
B) 45 parts of deionized water;
C) 15 parts of one or more alcohols with 1-8 carbon atoms;
D) 8 parts of carboxylate compound emulsifier;
E) 6 parts of an emulsification aid;
F) 5 parts of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 1.5h at normal temperature and at the rotating speed of 800r/min to obtain an oil phase;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: and adding the prepared water phase into the oil phase, stirring for 5 hours at the temperature of 90 ℃ and the rotating speed of 1200r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
Wherein the organic silicon surfactant is an organic silicon surfactant FY-S.
Wherein the alcohol is ethanol.
The carboxylate compound emulsifier consists of a carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant to the OP-9 to the Span60 is 6:2: 1.
Wherein the emulsifying aid is sodium dodecyl sulfate.
Wherein the HLB value of the emulsifying aid is 5-9.
Wherein the water-soluble temperature-resistant salt-resistant agent is selected from N-vinyl pyrrolidone.
Example 3
The preparation of the nano microemulsion for oil displacement according to the embodiment is based on the nano microemulsion for oil displacement, and comprises the following raw materials in parts by weight:
A) 48 parts of silicone surfactant;
B) 35 parts of deionized water;
C) 10 parts of one or more alcohols with 1-8 carbon atoms;
D) 5.5 parts of carboxylate compound emulsifier;
E) 4 parts of an emulsification aid;
F) 3 parts of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 1h at normal temperature and the rotation speed of 650r/min to obtain an oil phase;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: and adding the prepared water phase into the oil phase, stirring for 4 hours at the temperature of 75 ℃ and the rotating speed of 1000r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
Wherein the organic silicon surfactant is an organic silicon surfactant FY-S.
Wherein the alcohol is methanol.
The carboxylate compound emulsifier consists of a carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant to the OP-9 to the Span60 is 6:2: 1.
Wherein the emulsifying aid is Tween80 and sodium dodecyl sulfate.
Wherein the HLB value of the emulsifying aid is 5-9.
Wherein the water-soluble temperature-resistant salt-resistant agent is selected from N-vinyl pyrrolidone.
Example 4
The preparation of the nano microemulsion for oil displacement according to the embodiment is based on the nano microemulsion for oil displacement, and comprises the following raw materials in parts by weight:
A) 35 parts of silicone surfactant;
B) 30 parts of deionized water;
C) 8 parts of one or more alcohols with 1-8 carbon atoms;
D) 4 parts of carboxylate compound emulsifier;
E) 3 parts of an emulsification aid;
F) 2 parts of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 0.8h at the normal temperature and the rotation speed of 600r/min to obtain an oil phase;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: adding the prepared water phase into the oil phase, stirring for 3.5h at the temperature of 70 ℃ and the rotating speed of 900r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
Wherein the organic silicon surfactant is an organic silicon surfactant FY-S.
Wherein the alcohol is n-heptanol.
The carboxylate compound emulsifier consists of a carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant to the OP-9 to the Span60 is 6:2: 1.
Wherein the emulsifying aid is Tween 80.
Wherein the HLB value of the emulsifying aid is 5-9.
Wherein the water-soluble temperature-resistant salt-resistant agent is selected from N-vinyl pyrrolidone.
Example 5
The preparation of the nano microemulsion for oil displacement according to the embodiment is based on the nano microemulsion for oil displacement, and comprises the following raw materials in parts by weight:
A) 60 parts of silicone surfactant;
B) 40 parts of deionized water;
C) 12 parts of one or more alcohols with 1-8 carbon atoms;
D) 7 parts of carboxylate compound emulsifier;
E) 5 parts of an emulsification aid;
F) 4 parts of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 1.2h at the normal temperature and the rotation speed of 750r/min to obtain an oil phase;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: adding the prepared water phase into the oil phase, stirring for 4.5h at the temperature of 80 ℃ and the rotating speed of 1100r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
Wherein the organic silicon surfactant is an organic silicon surfactant FY-S.
Wherein the alcohol is n-hexanol.
The carboxylate compound emulsifier consists of a carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant to the OP-9 to the Span60 is 6:2: 1.
Wherein the emulsifying aid is sodium dodecyl sulfate.
Wherein the HLB value of the emulsifying aid is 5-9.
Wherein the water-soluble temperature-resistant salt-resistant agent is selected from N-vinyl pyrrolidone.
Comparative example 1
The nano microemulsion for oil displacement is prepared according to the same method as the embodiment 3, except that: the formula is free of organic silicon surfactant, free of carboxylate compound emulsifier, and comprises 48 parts of organic silicon surfactant, 35 parts of deionized water, 10 parts of one or more of alcohols with carbon numbers of 1-8, 5.5 parts of carboxylate compound emulsifier, 4 parts of emulsifying aid and 3 parts of water-soluble temperature-resistant salt-resistant agent.
Comparative example 2
The nano microemulsion for oil displacement is prepared according to the same method as the embodiment 3, except that: the formula is free of carboxylate compound emulsifier, and the formula comprises 48 parts of organic silicon surfactant, 35 parts of deionized water, 10 parts of one or more alcohols with the carbon number of 1-8, 5.5 parts of carboxylate compound emulsifier, 4 parts of emulsifying aid and 3 parts of water-soluble temperature-resistant salt-resistant agent.
Comparative example 3
A water-based drilling fluid lubricant was prepared in the same manner as in example 3, except that: the formula is free of a water-soluble temperature-resistant salt-resistant agent, the formula is free of a carboxylate compound emulsifier, and the formula comprises 48 parts of an organic silicon surfactant, 35 parts of deionized water, 10 parts of one or more of alcohols with the carbon number of 1-8, 5.5 parts of a carboxylate compound emulsifier, 4 parts of an emulsifying aid and 3 parts of a water-soluble temperature-resistant salt-resistant agent.
Experimental example 1
The nano microemulsion for oil displacement prepared in the examples 1 to 5 and the comparative examples 1 to 3 was subjected to a yield test, and specific results are shown in table 1.
TABLE 1 yield of each oil displacing nano-microemulsion
| Sample name | Yield of |
| Example 1 | 95.6% |
| Example 2 | 97.3% |
| Example 3 | 98.4% |
| Example 4 | 95.7% |
| Example 5 | 95.9% |
| Comparative example 1 | 86.8% |
| Comparative example 2 | 88.5% |
| Comparative example 3 | 90.9% |
As can be seen from Table 1, the yield of the nano microemulsion for oil displacement prepared by the invention is more than 95%, and as can be seen from comparative examples 1-3, adding the organic silicon surfactant, the carboxylate composite emulsifier and the water-soluble temperature-resistant salt-resistant agent into the microemulsion is helpful for improving the yield.
Experimental example 2
Oil displacement test:
and taking 8 cores, numbering 1-8, and respectively injecting crude oil into the cores 1-8.
Firstly, respectively adopting clear water to displace the rock cores 1-8 injected with crude oil, and calculating the water-flooding efficiency according to the mass of the displaced crude oil; then, on the basis of water flooding, the nano microemulsion for oil displacement prepared in the above examples 1 to 5 and the nano microemulsion for oil displacement prepared in the comparative examples 1 to 3 are respectively adopted for displacement, and the oil displacement efficiency of each oil displacement agent on each core is calculated according to the mass of the displaced crude oil, and the results are shown in table 4.
TABLE 4 oil-displacing efficiency of each oil-displacing agent
| Sample name | Rock numbering | Water drive recovery ratio (%) | Ultimate recovery ratio (%) | Recovery ratio increase amplitude (%) |
| Example 1 | 1 | 46.1 | 71.4 | 25.3 |
| Example 2 | 2 | 46.7 | 73.5 | 26.8 |
| Example 3 | 3 | 47.1 | 74.8 | 27.7 |
| Example 4 | 4 | 45.8 | 72.8 | 27.0 |
| Example 5 | 5 | 46.2 | 72.7 | 26.5 |
| Comparative example 1 | 6 | 45.5 | 65.3 | 19.8 |
| Comparative example 2 | 7 | 45.8 | 67.9 | 22.1 |
| Comparative example 3 | 8 | 45.1 | 68.7 | 23.6 |
As can be seen from Table 2, the nano microemulsion for oil displacement of the embodiments of the invention has high oil displacement efficiency on oil, and the oil recovery rate can be improved by 25%, thereby being beneficial to reducing the oil recovery cost, and the comparative examples 1-3 show that the addition of the silicone surfactant, the carboxylate compound emulsifier and the water-soluble temperature-resistant salt-resistant agent in the microemulsion is beneficial to improving the oil displacement efficiency and improving the oil recovery rate of the invention.
In conclusion, the main innovation points of the nano microemulsion for oil displacement are as follows:
1. the nano microemulsion for oil displacement has a synergistic interaction effect among the components, and can form ultralow interfacial tension with crude oil through the cooperation of an organic silicon surfactant, alcohol, a carboxylate composite emulsifier, an emulsifying aid and a water-soluble temperature-resistant salt-resistant agent, so that the recovery ratio of petroleum is greatly improved; in addition, the nano microemulsion is not easy to be adsorbed and eluted in the oil displacement process, and the loss of the surfactant is low, so that the oil extraction cost is favorably reduced;
2. according to the invention, the oil-based organic silicon surfactant, the carboxylate composite emulsifier, the alcohol, the water-based emulsification aid and the water-soluble temperature-resistant salt-resistant agent are mutually matched, so that the oil-water interfacial tension and the surface tension can be effectively reduced, the emulsification performance is improved, the adsorption quantity of the surfactant in an oil layer is reduced, and the crude oil recovery rate can be further improved;
3. according to the invention, the problems of poor temperature resistance and salt resistance and low oil displacement efficiency of the conventional microemulsion for oil displacement under the conditions of high temperature and high salt can be solved by adding the water-soluble temperature-resistant salt-resistant agent, so that the oil displacement efficiency is further improved, the crude oil recovery rate is improved, and the aqueous solution of the microemulsion can form ultralow interfacial tension with the crude oil through the ultrahigh interfacial activity of the water-soluble temperature-resistant salt-resistant agent, so that the cohesion among the crude oils is effectively overcome, the outflow of the crude oil is facilitated, and the oil displacement efficiency is greatly improved;
4. according to the invention, the organic silicon surfactant and the carboxylate compound emulsifier are compounded, so that the surface tension of oil is lowered, the interfacial tension is reduced, the emulsifying property is enhanced, the crude oil adhered to rock stratum sandstone can be further washed down, and the crude oil recovery rate is improved.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The preparation of the nano microemulsion for oil displacement is characterized in that the nano microemulsion for oil displacement comprises the following raw materials in parts by weight:
A) 30-65 parts of an organic silicon surfactant;
B) 25-45 parts of deionized water;
C) 5-15 parts of one or more alcohols with 1-8 carbon atoms;
D) 3-8 parts of carboxylate composite emulsifier;
E) 2-6 parts of an emulsification aid;
F) 1-5 parts of water-soluble temperature-resistant salt-resistant agent;
and the preparation of the nano microemulsion for oil displacement comprises the following steps:
s1: respectively adding the alcohol and carboxylate composite emulsifier into the organic silicon surfactant, and stirring for 0.5-1.5h at the normal temperature and the rotation speed of 500-;
s2: adding an emulsification aid into deionized water, uniformly stirring to prepare a solution, adding a water-soluble temperature-resistant salt-resistant agent, and stirring until the water-soluble temperature-resistant salt-resistant agent is completely dissolved to obtain a water phase;
s3: adding the prepared water phase into the oil phase, stirring for 3-5h at the temperature of 60-90 ℃ and the rotating speed of 800-1200r/min, and cooling to room temperature to obtain the nano microemulsion for oil displacement.
2. The preparation method of the nano microemulsion for oil displacement according to claim 1, wherein the nano microemulsion for oil displacement comprises the following raw materials in parts by weight:
A) 48 parts of silicone surfactant;
B) 35 parts of deionized water;
C) 10 parts of one or more alcohols with 1-8 carbon atoms;
D) 5.5 parts of carboxylate compound emulsifier;
E) 4 parts of an emulsification aid;
F) 3 parts of water-soluble temperature-resistant salt-resistant agent.
3. The preparation of nano microemulsion for oil displacement according to claim 1, wherein the silicone surfactant is silicone surfactant FY-S.
4. The preparation of nano microemulsion for oil displacement of claim 1, wherein the alcohol is C2-C5 straight chain or branched chain alkyl alcohol.
5. The preparation of nano microemulsion for oil displacement as claimed in claim 1, wherein the carboxylate composite emulsifier is composed of carboxylate surfactant, OP-9 and Span60, and the mass ratio of the carboxylate surfactant, OP-9 and Span60 is 6:2: 1.
6. The preparation of nano microemulsion for oil displacement according to claim 1, wherein the emulsifying auxiliary agent is Tween80 and/or sodium dodecyl sulfate.
7. The preparation method of the nano microemulsion for oil displacement according to claim 6, wherein the HLB value of the emulsification aid is 5-9.
8. The preparation of nano microemulsion for oil displacement according to claim 1, wherein the water-soluble temperature-resistant salt-resistant agent is selected from N-vinyl pyrrolidone.
9. A nano microemulsion for oil displacement, which is characterized by being prepared according to the preparation method of any one of claims 1 to 8.
10. The use of the nano microemulsion for oil displacement according to claim 9 in oil exploitation.
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| CN113652219A (en) * | 2021-10-19 | 2021-11-16 | 山东德仕化工有限公司 | Carbon dioxide oil displacement method |
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| CN113652219B (en) * | 2021-10-19 | 2022-03-08 | 山东德仕化工有限公司 | Carbon dioxide oil displacement method |
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