CN110847870A - Method for improving oil displacement efficiency of oil field with medium and low water content - Google Patents
Method for improving oil displacement efficiency of oil field with medium and low water content Download PDFInfo
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- CN110847870A CN110847870A CN201911078412.6A CN201911078412A CN110847870A CN 110847870 A CN110847870 A CN 110847870A CN 201911078412 A CN201911078412 A CN 201911078412A CN 110847870 A CN110847870 A CN 110847870A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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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- 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
- C09K8/588—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 polymers
Abstract
The invention provides a method for improving the oil displacement efficiency of a low-and-medium-water-content oil field, wherein crude oil in the low-and-medium-water-content oil field is subjected to oil displacement and recovery by using cocamidopropyl betaine solution, and the method for the low-and-medium-water-content oil field comprises the following steps: step one, preparing cocamidopropyl betaine solution; step two, preparing before injecting the cocamidopropyl betaine solution into the oil well; injecting the cocamidopropyl betaine solution into an oil well; step four, injecting clear water in a positive direction, driving and covering the cocamidopropyl betaine solution to an oil displacement area, closing a well and waiting for coagulation; step five, injecting clean water in a forward direction and a reverse direction alternately, and backwashing the oil drive well after a plurality of cycles to ensure that the water quality of an inlet and an outlet is consistent; step six, testing the water absorption section of the oil well; and seventhly, repeating the second step to the sixth step in sequence, and circulating for multiple times until the crude oil recovery in the oil well is finished. The oil extraction method can reduce the water injection pressure of the oil field with medium and low water content, improve the yield of crude oil and further improve the oil displacement efficiency.
Description
Technical Field
The invention relates to the technical field of crude oil recovery, in particular to a method for improving the oil displacement efficiency of a medium and low water-cut oil field, which is more suitable for oil recovery of a long 4+5, a long 6 and a long 8 oil reservoir area of a three-stacked system.
Background
Crude oil, i.e., petroleum, also known as "black gold", is conventionally referred to as crude oil produced directly from an oil well as raw petroleum, which is a dark brown or dark green viscous liquid or semi-solid combustible substance composed of various hydrocarbons.
In the development stage of oil field in China, water injection and oil displacement are carried out, and after long-time water injection, the oil field is basically produced in three exploitation stages of high water content, ultrahigh water content and medium-low water content at present, and in order to excavate the residual oil in the three stages, a technical method for improving the recovery ratio of crude oil is often adopted.
The level of recovery is related to many factors, not only to the natural conditions of reservoir lithology, physical properties, heterogeneity, fluid properties, and drive type, but also to the development scheme adopted in developing the oil field. The crude oil recovery method mainly aims at improving sweep efficiency and oil displacement efficiency, but the conventional profile control of a water injection well aims at improving the sweep efficiency of injected water and increasing the yield of an oil well, but the profile control is only suitable for water injection oil fields with high water content and ultrahigh water content, the effect of improving the yield of crude oil in the oil fields with medium and low water content is poor, and the profile control increases the water injection pressure, so that the subsequent water injection is difficult, the requirement of water injection cannot be met, the short injection is caused, and the residual crude oil cannot be effectively displaced.
Therefore, a method for improving the oil displacement efficiency of the oil field with medium and low water content is needed.
Disclosure of Invention
The invention aims to provide a method for improving the oil displacement efficiency of a medium and low water-cut oil field, which can reduce the water injection pressure of the medium and low water-cut oil field, improve the yield of crude oil and further improve the oil displacement efficiency.
The technical scheme for realizing the purpose of the invention is as follows: a method for improving the oil displacement efficiency of a low-and-medium-water-content oil field is characterized in that crude oil in the low-and-medium-water-content oil field is subjected to oil displacement and recovery by using cocamidopropyl betaine solution. The cocamidopropyl betaine is a zwitterionic surfactant, has excellent stability under acidic and alkaline conditions, presents positive and negative ions respectively, has good compatibility, small irritation, is easy to dissolve in water, is stable to acid and alkali, and soaks, permeates and peels crude oil in oil-containing mud by utilizing the surface activity of the cocamidopropyl betaine, so that the recovery ratio of three-recovery is improved.
The method for improving the oil displacement rate of the oil field with medium and low water content comprises the following steps:
preparing cocamidopropyl betaine solution with the concentration a and the concentration b;
step two, preparing work before the cocamidopropyl betaine solution is injected into the oil well, wherein the work comprises testing, well flushing, pressure testing and test injection of clear water;
step three, sequentially and continuously injecting the cocamidopropyl betaine solution into the oil well in the order of concentration a-concentration b-concentration a;
step four, injecting clear water in a positive direction, driving and covering the cocamidopropyl betaine solution injected into the oil well to an oil displacement area, closing the well and waiting for coagulation;
step five, injecting clean water in a forward direction and a reverse direction alternately, and backwashing the oil well after a plurality of cycles to ensure that the water quality of an inlet and an outlet is consistent;
step six, testing the water absorption section of the oil well;
and seventhly, repeating the second step to the sixth step in sequence, and circulating for multiple times until the crude oil recovery in the oil well is finished.
In the second step, the concentration of b = a concentration-0.1% through test verification.
The test proves that the concentration a is 0.3-1.0%, and when the concentration (namely the concentration a and the concentration b) of the cocamidopropyl betaine solution reaches 0.2-1.0%, the tension of an oil-water interface can be effectively reduced, and the oil recovery rate is improved.
The principle of improving the recovery ratio of the low-water-bearing oil in the invention is as follows: by adding a natural plant surfactant solution (i.e., cocamidopropyl betaine solution), the plant surfactant solution is able to reduce the interfacial tension between the oil phase and the displacement water phase, forming an ultra-low interfacial tension as the plant surfactant solution diffuses in the displacement water phase and reaches the oil-water interface. When the interfacial tension is low enough, the capillary force of oil drops or residual oil blocks formed by capturing the crude oil in the pore gaps is weakened, and the oil drops can flow under the action of viscous force and gravity, so that the saturation of the residual oil is reduced, and the purpose of oil displacement is achieved; when the residual crude oil is carried out along with the plant surfactant solution, the water injection pressure of the middle-low water-containing oil field is reduced simultaneously.
Further, the cocamidopropyl betaine solution is an aqueous solution of cocamidopropyl dimethylamine caprolactone. Cocoamidopropyl dimethylamine caprolactone with molecular formula of [ RCONH (CH)2)3N+(CH3)2CH2COO- "is from plant, is a complex polymer organic matter, and has the advantages of high viscosity, no irritation, no adverse side effect, high safety, easy biodegradation, and good compatibility.
As an improvement of the invention, the cocamidopropyl betaine solution also contains polyethylene glycol, and the cocamidopropyl betaine and the polyethylene glycol form a binary system oil displacement agent of crude oil. Polyethylene glycol (PEG) is non-toxic and non-irritant, and has good compatibility with many organic substances. The polyethylene glycol does not react with the cocamidopropyl betaine, and the binary system oil displacement agent formed by the cocamidopropyl betaine can further reduce the finger of the cocamidopropyl betaine and further improve the oil displacement rate.
Preferably, in order to effectively control the oil extraction cost and the oil displacement rate, the concentration of the polyethylene glycol in the binary system oil displacement agent is 0.2-0.7%. When 0.2-0.7% of polyethylene glycol is added into the cocamidopropyl betaine solution, the fingering of the polyethylene glycol in the cocamidopropyl betaine is reduced, so that the input-output ratio in oil extraction is more than 1: 2.
As another improvement of the invention, the cocamidopropyl betaine has good compatibility, and when microspheres or polymers are added into the cocamidopropyl betaine solution, the cocamidopropyl betaine and the microspheres or polymers form a binary system oil displacement agent of the crude oil. Microspheres refer to a dispersion of microparticles in which a drug is dispersed or adsorbed in a polymeric or polymeric matrix.
Compared with the prior art, the beneficial effects of the invention are as follows: the method for improving the oil displacement efficiency of the crude oil is suitable for the oil reservoir areas with the length of 4+5, the length of 6 and the length of 8 of a three-fold system and the areas with effective water injection, and the temperature is lower than 90 ℃. The botanical surfactant of cocamidopropyl dimethylamine caprolactone can form ultra-low interfacial tension on an oil-water interface, so that residual crude oil can be effectively displaced.
Detailed Description
The present invention is described in detail with reference to the following embodiments, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functional, method, or structural equivalents of these embodiments or substitutions may be made without departing from the scope of the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The specific embodiment provides a method for improving the oil displacement efficiency of a low-and-medium-water-content oil field, wherein crude oil in the low-and-medium-water-content oil field is subjected to oil displacement and recovery by using cocamidopropyl betaine solution. The cocamidopropyl betaine is a zwitterionic surfactant, has excellent stability under acidic and alkaline conditions, presents positive and negative ions respectively, has good compatibility, small irritation, is easy to dissolve in water, is stable to acid and alkali, and soaks, permeates and peels crude oil in oil-containing mud by utilizing the surface activity of the cocamidopropyl betaine, so that the recovery ratio of three-recovery is improved.
The method for improving the oil displacement efficiency of the oil field with medium and low water content comprises the following steps:
preparing cocamidopropyl betaine solution with the concentration a and the concentration b;
step two, preparing work before the cocamidopropyl betaine solution is injected into the oil well, wherein the work comprises testing, well flushing, pressure testing and test injection of clear water;
step three, sequentially and continuously injecting the cocamidopropyl betaine solution into the oil well in the order of concentration a-concentration b-concentration a;
step four, injecting clear water in a positive direction, driving and covering the cocamidopropyl betaine solution injected into the oil well to an oil displacement area, closing the well and waiting for coagulation;
step five, injecting clean water in a forward direction and a reverse direction alternately, and backwashing the oil well after a plurality of cycles to ensure that the water quality of an inlet and an outlet is consistent;
step six, testing the water absorption section of the oil well;
and seventhly, repeating the second step to the sixth step in sequence, and circulating for multiple times until the crude oil recovery in the oil well is finished.
In the second step, the concentration of b = a concentration-0.1% through test verification.
The method for improving the oil displacement rate is described in detail by the following specific embodiments:
example 1:
the embodiment introduces a long 6 oil whitening 217-3 well group example of a white leopard oil field, and the method for improving the oil displacement efficiency of the oil field with medium and low water content comprises the following steps:
the method comprises the following steps: an aqueous solution of cocamidopropyl dimethylamine glycolide with a concentration =0.5% was prepared, and an aqueous solution of cocamidopropyl dimethylamine glycolide with a concentration =0.4% was prepared.
Step two: preparing the cocamidopropyl dimethylamine caprolactone solution in the first step before injecting into the oil well, wherein the preparation comprises testing, well flushing, pressure testing and test injection of clean water; wherein, the test is to record the data of a water absorption indicating curve, a pressure drop curve and the like before construction; the well washing is to stop injection one day before construction and to reversely wash the well until the water quality of an inlet and an outlet is consistent; the pressure test is to connect the ground pipeline, the pressure test is 25MPa, the pressure is stabilized for 5 minutes, and no puncture and no leakage are qualified; and the clean water injection test is to observe the change of the pump pressure and determine the water absorption condition of the stratum.
Step three: injecting the cocoamidopropyl dimethylamine ethyl lactone aqueous solution with the concentration a and the concentration b into the position of a perforation section of an oil well by a plunger pump in a three-plunger type (namely, injecting the cocoamidopropyl dimethylamine ethyl lactone aqueous solution with the concentration a-b-a sequentially and continuously in the sequence of the concentration a-b-a) during injectionThe injection amount of the lactone aqueous solution was 600m each3、1500m3、200m3。
Step four: clean water is injected into the tank in a forward direction for 60m3And (3) driving and covering the cocoamidopropyl dimethylamine ethyl lactone aqueous solution injected into the oil well to a driving area, closing the well and waiting for coagulation for 3 days.
Step five: the clear water is injected into the chamber in the forward direction and the reverse direction alternately for 30m3And after a plurality of cycles (the total time is about 1 month), backwashing the oil well by using clean water to ensure that the water quality of the inlet and the outlet is consistent.
Step six: testing the water absorption profile of the oil well;
step seven: and repeating the second step to the sixth step, and circulating for multiple times until the original recovery in the oil well is finished.
In the embodiment, after the white 217-3 well group of the long 6 oil reservoir of the white leopard oil field is subjected to oil displacement and oil extraction through the steps, the average daily production fluid of a single well at the initial stage of production is 4.0m33.0t of daily oil production of a single well, and 13.4 percent of comprehensive water content; average daily liquid production per well of 2.0m after production3The daily oil production of a single well is 0.9t, the comprehensive water content is 43.1 percent, the working fluid surface is 1686m, and the salt content is 51870 mg/L. After oil displacement by a cocamidopropyl dimethylamine ethyl lactone aqueous solution, the daily production liquid of a white 217-3 well group is 10.5m3Increase of/d to 12.0m3And d, increasing the daily oil yield to 4.5t/d, reducing the water content to 55.0 percent by 60.4 percent, and increasing the oil content by 127t cumulatively in the month.
Example 2:
the embodiment introduces a white 216-4 well group example of a long 8 oil reservoir of a white leopard oil field, and the method for improving the oil displacement efficiency of the oil field with medium and low water cut comprises the following steps:
the method comprises the following steps: an aqueous solution of cocamidopropyl dimethylamine lactone with a concentration =0.8% and an aqueous solution of cocamidopropyl dimethylamine lactone with a concentration =0.7% were prepared, and polyethylene glycol was added to the aqueous solutions of cocamidopropyl dimethylamine lactone with a concentration and a concentration b so that the concentration of polyethylene glycol was 0.5% ± 0.1%.
Step two: preparing the cocamidopropyl dimethylamine caprolactone solution in the first step before injecting into the oil well, wherein the preparation comprises testing, well flushing, pressure testing and test injection of clean water; wherein, the test is to record the data of a water absorption indicating curve, a pressure drop curve and the like before construction; the well washing is to stop injection one day before construction and to reversely wash the well until the water quality of an inlet and an outlet is consistent; the pressure test is to connect the ground pipeline, the pressure test is 25MPa, the pressure is stabilized for 5 minutes, and no puncture and no leakage are qualified; and the clean water injection test is to observe the change of the pump pressure and determine the water absorption condition of the stratum.
Step three: injecting the cocoamidopropyl dimethylamine glycolide aqueous solution with the concentration a and the concentration b into the perforation section layer of the oil well by a plunger pump in a three-plunger type (namely, injecting the cocoamidopropyl dimethylamine glycolide aqueous solution with the concentration a-b-a sequentially and continuously in the sequence of the concentration a-concentration b-concentration a), wherein the injection amount of the cocoamidopropyl dimethylamine glycolide aqueous solution with the concentration a and the concentration b is 600m respectively during injection3、1500m3、200m3。
Step four: clean water is injected into the tank in a forward direction for 60m3And (3) driving and covering the cocoamidopropyl dimethylamine ethyl lactone aqueous solution injected into the oil well to a driving area, closing the well and waiting for coagulation for 4 days.
Step five: the clear water is injected into the chamber in the forward direction and the reverse direction alternately for 30m3And after a plurality of cycles (the total time is about 1 month), backwashing the oil well by using clean water to ensure that the water quality of the inlet and the outlet is consistent.
Step six: testing the water absorption profile of the oil well;
step seven: and repeating the second step to the sixth step, and circulating for multiple times until the original recovery in the oil well is finished.
In the embodiment, after the white 216-4 well groups of the long 8 oil reservoirs of the white leopard oil fields are subjected to oil displacement and oil extraction through the steps, the average daily production liquid of a single well at the initial stage of production is 4.2m33.1t of daily oil production of a single well, and 13.4 percent of comprehensive water content; average daily liquid production per well of 2.5m after production31.1t of daily oil production of a single well, 43.1 percent of comprehensive water content, 1696m of working fluid level and 51877mg/L of salt. After oil displacement by a cocamidopropyl dimethylamine ethyl lactone aqueous solution, the daily production liquid of a white 216-4 well group is 10.6m3Increase of/d to 12.5m3And d, increasing the daily oil yield to 4.47t/d from 3.4t/d, reducing the water content to 54.3 percent from 59.4 percent, and increasing the oil content to 137t in a monthly accumulated way.
Example 3:
the embodiment introduces a white 206-1 well group example of a long 4+5 oil reservoir of a white leopard oil field, and the method for improving the oil displacement efficiency of the oil field with medium and low water content comprises the following steps:
the method comprises the following steps: preparing an aqueous solution of cocamidopropyl dimethylamine glycolide with a concentration =0.4%, preparing an aqueous solution of cocamidopropyl dimethylamine glycolide with b concentration =0.3%, and adding microspheres or polymers into the aqueous solution of cocamidopropyl dimethylamine glycolide with a concentration and b concentration to make the concentration of the microspheres or polymers be 0.6% + -0.1%.
Step two: preparing the cocamidopropyl dimethylamine caprolactone solution in the first step before injecting into the oil well, wherein the preparation comprises testing, well flushing, pressure testing and test injection of clean water; wherein, the test is to record the data of a water absorption indicating curve, a pressure drop curve and the like before construction; the well washing is to stop injection one day before construction and to reversely wash the well until the water quality of an inlet and an outlet is consistent; the pressure test is to connect the ground pipeline, the pressure test is 25MPa, the pressure is stabilized for 5 minutes, and no puncture and no leakage are qualified; and the clean water injection test is to observe the change of the pump pressure and determine the water absorption condition of the stratum.
Step three: injecting the cocoamidopropyl dimethylamine glycolide aqueous solution with the concentration a and the concentration b into the perforation section layer of the oil well by a plunger pump in a three-plunger type (namely, injecting the cocoamidopropyl dimethylamine glycolide aqueous solution with the concentration a-b-a sequentially and continuously in the sequence of the concentration a-concentration b-concentration a), wherein the injection amount of the cocoamidopropyl dimethylamine glycolide aqueous solution with the concentration a and the concentration b is 600m respectively during injection3、1500m3、200m3。
Step four: clean water is injected into the tank in a forward direction for 60m3And (3) driving and covering the cocoamidopropyl dimethylamine ethyl lactone aqueous solution injected into the oil well to a driving area, closing the well and waiting for coagulation for 4 days.
Step five: the clear water is injected into the chamber in the forward direction and the reverse direction alternately for 30m3And after a plurality of cycles (the total time is about 1 month), backwashing the oil well by using clean water to ensure that the water quality of the inlet and the outlet is consistent.
Step six: testing the water absorption profile of the oil well;
step seven: and repeating the second step to the sixth step, and circulating for multiple times until the original recovery in the oil well is finished.
In the embodiment, after the long 4+5 oil-white 206-1 well group of the white leopard oil field is subjected to oil displacement and oil extraction through the steps, the average daily production fluid of a single well at the initial stage of production is 3.2m33.7t of daily oil production of a single well, and 15.4 percent of comprehensive water content; average after productionDaily liquid production of single well 2.9m3The daily oil production of a single well is 0.95t, the comprehensive water content is 42.7 percent, the working fluid surface is 1596m, and the salt content is 51679 mg/L. After oil displacement by a cocamidopropyl dimethylamine ethyl lactone aqueous solution, the daily production liquid of a 206-1 well group is 11.6m3Increase of/d to 13.7m3And d, increasing the daily oil yield to 4.24t/d from 3.0t/d, reducing the water content to 53.0 percent from 57.4 percent, and increasing the oil content to 142t cumulatively in the month.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A method for improving the oil displacement efficiency of a medium-low water-cut oil field is characterized by comprising the following steps: the method for carrying out oil displacement recovery on crude oil in the low and medium water-containing oil field by using the cocamidopropyl betaine solution to improve the oil displacement rate of the low and medium water-containing oil field comprises the following steps:
preparing cocamidopropyl betaine solution with the concentration a and the concentration b;
step two, preparing work before the cocamidopropyl betaine solution is injected into the oil well, wherein the work comprises testing, well flushing, pressure testing and test injection of clear water;
step three, sequentially and continuously injecting the cocamidopropyl betaine solution into the oil well in the order of concentration a-concentration b-concentration a;
step four, injecting clear water in a positive direction, driving and covering the cocamidopropyl betaine solution injected into the oil well to an oil displacement area, closing the well and waiting for coagulation;
step five, injecting clean water in a forward direction and a reverse direction alternately, and backwashing the oil well after a plurality of cycles to ensure that the water quality of an inlet and an outlet is consistent;
step six, testing the water absorption section of the oil well;
step seven, repeating the step two to the step six in sequence, and circulating for multiple times until the crude oil in the oil well is completely recovered;
wherein, in the second step, the concentration of b = the concentration of a-0.1%.
2. The method for improving the oil displacement efficiency of the middle-low water-cut oil field according to claim 1, characterized in that: the concentration of the alpha is 0.3-1.0%.
3. The method for improving the oil displacement efficiency of the middle-low water-cut oil field according to claim 2, characterized in that: the cocamidopropyl betaine solution is a cocamidopropyl dimethylamine ethylene lactone aqueous solution.
4. The method for improving the oil displacement efficiency of the middle-low water-cut oil field according to any one of claims 1 to 3, characterized by comprising the following steps: polyethylene glycol is also added in the cocamidopropyl betaine solution, and the cocamidopropyl betaine and the polyethylene glycol form a binary system oil displacement agent of crude oil.
5. The method for improving the oil displacement efficiency of the middle-low water-cut oil field according to claim 4, characterized in that: the concentration of the polyethylene glycol in the binary system oil displacement agent is 0.2-0.7%.
6. The method for improving the oil displacement efficiency of the middle-low water-cut oil field according to any one of claims 1 to 3, characterized by comprising the following steps: microspheres or polymers are also added in the cocamidopropyl betaine solution, and the cocamidopropyl betaine and the microspheres or the polymers form a binary system oil displacement agent of the crude oil.
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| CN111350498A (en) * | 2020-04-13 | 2020-06-30 | 西南石油大学 | Method for describing weak flooding distribution characteristics of medium-high permeability oil reservoir in ultra-high water content development period |
| CN112443301A (en) * | 2020-12-02 | 2021-03-05 | 西安石油大油气科技有限公司 | Method for improving crude oil recovery ratio by integrating oil displacement and pressure reduction |
| CN112538343A (en) * | 2020-12-02 | 2021-03-23 | 西安石油大油气科技有限公司 | Preparation method of oil displacement and pressure reduction type betaine surfactant |
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