CN113214815B - Nanometer microemulsion oil displacement agent and preparation method thereof - Google Patents
Nanometer microemulsion oil displacement agent and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the field of chemical oil displacement for improving the recovery ratio of crude oil, and in particular relates to a nano microemulsion oil displacement agent which consists of water, oil, a surfactant, isopropanol and sodium chloride; wherein the volume ratio of the oil to the water is 0.8-0.9:1, the concentration of the surfactant is 2.0-2.5 wt.% based on the total weight of the oil and water, the concentration of the isopropanol is 3.0-8.0 wt.%, and the concentration of the sodium chloride is 2.0-5.5 wt.%; the surfactant is a combination of polyoxyethylene ether nonionic surfactant (Triton X) and sulfonated saponin. The nano microemulsion oil displacement agent of the invention belongs to medium phase microemulsion, the particle size is small, the droplet size is about 20-50 nm, and the interfacial tension between the nano microemulsion oil displacement agent and oil-water two phases can be reduced to 1.0 multiplied by 10 ‑4 mN/m below, and can improve the recovery ratio of crude oil by at least 10 percent compared with water flooding.
Description
Technical Field
The invention belongs to the field of chemical oil displacement for improving the recovery ratio of crude oil, and particularly relates to a nano microemulsion oil displacement agent and a preparation method thereof.
Background
With the continuous progress of oil exploitation, many regions of the world have been put into high water content and very high water content stages in the later stages of development. In order to improve the recovery ratio of the old oil field and increase the recoverable reserves, a tertiary oil recovery method is currently adopted to improve the recovery ratio of crude oil after water flooding, which is also called an Enhanced Oil Recovery (EOR) method, and is generally used for improving the mutual performances of oil, gas, water and rock by injecting chemical agents, heat, mixed solvents and the like after secondary oil recovery so as to recover more petroleum.
Four major technical families of tertiary oil recovery, namely chemical flooding, gas flooding, thermal flooding and microbial oil recovery, are now formed in the world. The chemical flooding comprises polymer flooding, surfactant flooding, alkaline water flooding and compound flooding technologies.
The polymer can greatly increase the viscosity of the displacement fluid, improve the oil-water fluidity ratio and block the hypertonic layer, so the polymer is often used for oil displacement to enhance the oil extraction effect. However, the existing chemical flooding technology including polymer flooding is mainly used for medium-high permeability reservoirs with high permeability and large pore-throat radius, and is hardly applied to medium-low permeability reservoirs, mainly because the medium-low permeability reservoirs have the characteristics of low permeability, small pore-throat radius, large seepage resistance, and easy blockage and the like in geology, so that the technical problems of 'no injection and no production' exist on site, and the problems also limit the application of the traditional chemical flooding, and cause the serious low utilization degree and development effect of the medium-low permeability reservoirs.
In recent years, microemulsion displacement is used as a newer displacement method, so that the displacement efficiency and sweep coefficient can be maximized, breakthrough results are obtained in tertiary oil recovery of low-permeability reservoirs, and the crude oil recovery is greatly improved. Microemulsions are transparent or translucent dispersions of oil and water that spontaneously form under certain conditions, under the action of surfactants and cosurfactants, with thermodynamically stable, isotropic, low viscosity. The particle size of the microemulsion is generally 10-100 nm, and the particle size is far smaller than the pore throat radius of the low-permeability oil reservoir, so that the phenomenon of blocking the throat can not occur. The microemulsion solution can be mixed with oil and water, and the interfacial tension of oil and water is greatly reduced. Compared with the upper phase microemulsion and the lower phase microemulsion, the middle phase microemulsion has more obvious capability of reducing the oil-water interfacial tension, and the interfacial tension can reach 10 -2 ～10 -5 mN/m. The microemulsion has important application value in tertiary oil recovery, and the crude oil recovery efficiency is generally improved by 10 percentAbove the point.
The anion-cation pair nanoemulsion oil displacement agent for medium-low permeability reservoir oil displacement disclosed in Chinese patent CN 110527503A has an average particle size of less than 100nm and comprises the following components in percentage by mass: 0.01% -10% of disperse phase, 20% -50% of anionic-cationic system surfactant, 10% -30% of zwitterionic surfactant, 0.5% -15% of low-carbon alcohol and the balance of water. The cation-anion pair nano emulsion oil displacement agent has the advantages of high surface activity, strong temperature resistance and salt resistance, low adsorption loss, low use concentration and the like, and can effectively improve the recovery ratio of medium-low permeability oil reservoirs by more than 15 percent. However, the content of the surfactant in the composition is up to 80%, so that the production cost and the final use cost are obviously too high, and the economic benefit is low.
The homogeneous microemulsion oil displacement agent for improving the recovery ratio of crude oil applied to a low-permeability oilfield and a preparation method thereof are disclosed in Chinese patent CN 105331348A, wherein the formulation of the homogeneous microemulsion oil displacement agent comprises the following components: the volume ratio of the oil to the water is 1:1, the concentration of each component is represented by the mass percentage concentration of each component accounting for the total amount of the oil and the water, the concentration of the compound surfactant is 2% -3.5%, the concentration of the cosurfactant is 4.5% -11%, and the concentration of the electrolyte is 2.5% -8.5%. The oil-displacing agent has good thermodynamic stability, strong water and oil solubilizing capacity and ultralow interfacial tension (10) -3 mN/m), but the performance of reducing the oil-water interfacial tension is still to be further improved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is how to provide the nano microemulsion oil displacement agent which has low production cost, can obviously reduce the oil-water interfacial tension, effectively reduce the capillary force, improve the fluidity of crude oil in rock pores, and further can obviously improve the recovery ratio.
In order to solve the technical problems, the inventor of the present invention has found a nano microemulsion oil displacement agent with specific composition, which can reduce the oil-water interfacial tension to 1.0X10 -4 mN/m below, and further can improve the recovery ratio of crude oil by at least 10 percent compared with water flooding.
The technical scheme of the invention is as follows:
a nanometer microemulsion oil displacement agent comprises water, oil, surfactant, isopropanol and sodium chloride; wherein the volume ratio of the oil to the water is 0.8-0.9:1, the concentration of the surfactant is 2.0-2.5 wt.% based on the total weight of the oil and water, the concentration of the isopropanol is 3.0-8.0 wt.%, and the concentration of the sodium chloride is 2.0-5.5 wt.%; the surfactant is a combination of polyoxyethylene ether nonionic surfactant (Triton X) and sulfonated saponin.
The oil is oil field crude oil, or crude oil diluted with light oil, or C 6 -C 18 Can be selected based on the rule of equivalent alkane carbon atoms of crude oil, such as n-heptane, n-octane, n-nonane, butylcyclohexane, etc., preferably n-heptane.
In order to further enhance the deblocking effect, the oil may contain an optional limonene solvent, preferably in an amount of 10-30% by volume of the oil.
The polyoxyethylene ether nonionic surfactant is preferably Triton X-100.
The sulfonated saponin is prepared by the following method:
firstly, enabling saponin to contact fuming sulfuric acid for sulfonation reaction, wherein the sulfonation reagent is 3-6h; then washing with deionized water and absolute ethyl alcohol alternately for 1-2 times, and finally drying; the drying temperature is 50-80 ℃ and the drying time is 1-3h.
Wherein, the mass ratio of Triton X to sulfonated saponin is 5-8: 1, preferably 6 to 7:1, most preferably 6:1.
the concentration of the surfactant is preferably 2.2wt.%.
The concentration of isopropyl alcohol is preferably 4.0 to 7.0wt.%, more preferably 5wt.%.
The concentration of sodium chloride is preferably 3.0 to 5.0wt.%, more preferably 3.5wt.%.
The preparation method of the nano microemulsion oil displacement agent comprises the following steps:
1) Preparing an emulsion: according to the metering ratio, firstly mixing and stirring oil and water, then adding a surfactant and sodium chloride, and uniformly stirring to obtain emulsion;
2) Preparing a microemulsion: adding isopropanol according to the metering ratio, stirring uniformly, and standing to obtain the homogeneous microemulsion.
The inventors of the present application have found that by using the preparation process of the present invention, the interfacial tension of the oil and water can be significantly reduced relative to the Shah process, i.e., by first formulating an emulsion system of oil, surfactant and isopropyl alcohol, and then adding water to obtain a microemulsion.
The invention also provides application of the nano microemulsion oil displacement agent in improving the recovery ratio of a low-permeability oil reservoir.
Compared with the prior art, the invention has the following beneficial effects:
1. the nano microemulsion oil displacement agent effectively utilizes the synergistic effect of the components by selecting the surfactant with specific composition and taking the isopropyl alcohol as the cosurfactant, thereby reducing the oil-water interfacial tension to 1.0 multiplied by 10 -4 mN/m or less; and further, the oil displacement efficiency can be effectively improved, so that the oil recovery ratio of the crude oil is improved by at least 50% compared with that of water flooding.
2. The nano microemulsion oil displacement agent of the invention belongs to medium phase microemulsion, and the interfacial tension between the oil phase and the oil-water phase can be reduced to 1.0 multiplied by 10 -4 mN/m or less, thereby significantly increasing the number of capillary; compared with the traditional upper-phase or lower-phase microemulsion, the oil displacement effect is optimal.
3. The nano microemulsion oil displacement agent has great solubilization capacity, and the solubilization capacity to crude oil can be up to more than 70%.
4. The nano microemulsion oil displacement agent has small particle size, the droplet size is about 20-50 nm, and the nano microemulsion oil displacement agent can permeate into micro pores of a low-permeability reservoir layer, enter into nano-scale fine throats and micro throats, can communicate channels, improves the fluidity of crude oil, and can effectively realize the purposes of displacement, acidification, blockage removal, injection increase and the like.
5. The nano microemulsion oil displacement agent can effectively reduce capillary force, and compared with a conventional surfactant, the nano microemulsion oil displacement agent can reduce capillary force by at least 50%; and can reduce or eliminate capillary end effects.
6. The nano microemulsion oil displacement agent can improve the flowback rate of fracturing fluid.
7. The nano microemulsion oil displacement agent has small adsorption capacity to the solid phase surface, and can reach all areas of liquid wave; compared with the conventional surfactant, the adsorption of rock can be effectively reduced, and the low interfacial tension can be maintained, so that the flow pressure of liquid can be reduced.
8. The nano microemulsion oil displacement agent has simple preparation process, is environment-friendly in preparation process and does not cause environmental pollution.
9. The nano microemulsion oil displacement agent has the advantages of easily available raw materials and wide sources, so that the production cost and the use cost of the product are extremely low.
Additional advantages will be set forth in part in the description which follows, and in part will be apparent from the description. The following advantages are realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive.
Supplemental definition
The materials, compounds, compositions and components described herein may be used in, or in combination with, the methods and compositions described herein or may be used to practice and prepare the compositions or as products obtained by the methods. It is to be understood that when combinations, subsets, interactions, groups, etc. of these materials are disclosed that while specific reference of each and every one of these compounds may not be explicitly contemplated and described herein. For example, if an extraction aid component is disclosed and discussed, and a number of alternative solid state forms of the component are discussed, each combination and permutation of the aid component and the solid state forms that are possible are specifically contemplated unless specifically indicated to the contrary. This concept applies to all aspects of the invention including, but not limited to, steps in methods of making and using the disclosed compositions. Thus, if there are a plurality of additional steps that can be performed, it should be understood that each of these additional steps can be performed by any specific embodiment or combination of embodiments of the disclosed methods, and that each such combination is specifically contemplated as being disclosed.
In this specification and the claims which follow, reference will be made to a number of terms which shall be defined to have the following meanings:
it must be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include both a reference and a plurality of references (i.e., more than two, including two) unless the context clearly dictates otherwise. Thus, for example, reference to "the base" can include a single base, or a mixture of two or more bases, and so forth.
Unless otherwise indicated, the numerical ranges in the present invention are approximate, and thus values outside the ranges may be included. The numerical ranges may be expressed herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another aspect. It will also be understood that the endpoints of each of the numerical ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
References in the specification and the claims to parts by weight of a particular element or component in a composition or article refer to the relationship by weight between that element or component and any other element or component in the composition or article. Thus, in a composition comprising 2 parts by weight of component X and 5 parts by weight of component Y, X and Y are present in a weight ratio of 2:5, and are present in that ratio whether or not additional components are included in the composition.
All fractions and percentages mentioned in the present invention are by weight, unless specifically indicated to the contrary, or implied by the context of the context or conventional manner in the art, and the weight percentages of the components are based on the total weight of the composition or product comprising the components.
References to "comprising," "including," "having," and similar terms in this invention are not intended to exclude the presence of any optional components, steps or procedures, whether or not any optional components, steps or procedures are specifically disclosed. For the avoidance of any doubt, unless stated to the contrary, all methods claimed through use of the term "comprising" may include one or more additional steps, apparatus parts or components and/or materials. In contrast, the term "consisting of … …" excludes any component, step or procedure not specifically recited or enumerated. The term "or" refers to members recited individually as well as in any combination unless otherwise specified.
Furthermore, the contents of any of the referenced patent documents or non-patent documents in the present invention are incorporated by reference in their entirety, especially with respect to the definitions and general knowledge disclosed in the art (in case of not inconsistent with any definitions specifically provided by the present invention).
Detailed Description
The following examples are put forth so as to provide those of ordinary skill in the art with a complete disclosure and description of how the compounds, compositions, articles, devices, and/or methods described and claimed herein are made and evaluated, and are intended to be merely illustrative and are not intended to limit the scope of what applicants regard as their invention. Efforts have been made to ensure accuracy with respect to numbers (e.g., amounts, temperature, etc.), but some errors and deviations should be accounted for. Unless otherwise indicated, parts are parts by weight, temperatures are expressed in degrees celsius or at ambient temperature, and pressures are at or near atmospheric. There are numerous variations and combinations of reaction conditions (e.g., component concentrations, solvents needed, solvent mixtures, temperatures, pressures, and other reaction ranges) and conditions that can be used to optimize the purity and yield of the product obtained by the process. Only reasonable routine experimentation will be required to optimize such process conditions.
The instruments, reagents, materials, etc. used in the following examples are conventional instruments, reagents, materials, etc. existing in the prior art, and are commercially available in a normal manner unless otherwise specified. The experimental methods, detection methods, and the like in the following examples are conventional experimental methods, detection methods, and the like, which are known in the art, unless otherwise specified.
Example 1:
a nanometer microemulsion oil displacement agent comprises water, oil, surfactant, isopropanol and sodium chloride; wherein the volume ratio of oil to water is 0.8:1, the concentration of the surfactant is 2.2wt.%, the concentration of isopropanol is 5.0wt.%, and the concentration of sodium chloride is 3.5wt.%, based on the total weight of the oil and water; the surfactant is the combination of Triton X-100 and sulfonated saponin, and the mass ratio of the Triton X-100 to the sulfonated saponin is 6:1, a step of; the oil is n-heptane.
The preparation process is as follows:
1) Preparing sulfonated saponin: firstly, enabling saponin to contact fuming sulfuric acid for sulfonation reaction, wherein the sulfonation reagent is 5 hours; then washing for 1 time by deionized water and absolute ethyl alcohol alternately, and finally drying; the drying temperature is 60 ℃ and the drying time is 2 hours.
2) Preparing an emulsion: according to the metering ratio, firstly mixing and stirring oil and water, then adding a surfactant and sodium chloride, and stirring uniformly to obtain emulsion.
3) Preparing a microemulsion: adding isopropanol according to the metering ratio, stirring uniformly, and standing to obtain the homogeneous microemulsion.
Example 2
A nanometer microemulsion oil displacement agent comprises water, oil, surfactant, isopropanol and sodium chloride; wherein the volume ratio of oil to water is 0.9:1, the concentration of the surfactant is 2.0wt.%, the concentration of isopropanol is 6.0wt.%, and the concentration of sodium chloride is 4.0wt.%, based on the total weight of the oil and water; the surfactant is the combination of Triton X-100 and sulfonated saponin, and the mass ratio of the Triton X-100 to the sulfonated saponin is 7:1, a step of; the oil is n-heptane.
The preparation method is the same as in example 1.
Comparative example 1
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the volume ratio of oil to water was 1:1.
The preparation method is the same as in example 1.
Comparative example 2
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the concentration of surfactant was 3.0wt.%.
The preparation method is the same as in example 1.
Comparative example 3
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the mass ratio of Triton X-100 to sulfonated saponin is 4:1.
the preparation method is the same as in example 1.
Comparative example 4
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the mass ratio of Triton X-100 to sulfonated saponin is 9:1.
the preparation method is the same as in example 1.
Comparative example 5
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the concentration of isopropanol was 10.0wt.%.
The preparation method is the same as in example 1.
Comparative example 6
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the surfactant is Triton X-45 in combination with sulfonated saponin.
The preparation method is the same as in example 1.
Comparative example 7
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: n-butanol was used as a cosurfactant instead of isopropanol.
The preparation method is the same as in example 1.
Comparative example 8
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the surfactant is Triton X-100 in combination with saponin.
The preparation method is basically the same as that of example 1, and the step of sulfonating the saponin and adding sulfonated saponin is omitted.
Comparative example 9
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the surfactant was Triton X-100 only.
The preparation method is basically the same as in example 1, and the step of adding sulfonated saponin is omitted.
Comparative example 10
The composition of the nano microemulsion oil displacement agent is basically the same as that of the example 1, and the difference is that: the surfactant is only sulfonated saponin.
The preparation method is basically the same as in example 1, and the step of adding Triton X-100 is omitted.
The particle size of the prepared nano microemulsion oil displacement agent, interfacial tension between oil and water are examined according to the following method, and the crude oil recovery capability is improved.
1. Particle size measurement: and (5) scanning electron microscopy is carried out on the homogeneous microemulsion system, and the particle size is observed.
2. Measuring interfacial tension between the nano microemulsion oil displacement agent and oil and water: the test temperature is 75 ℃, the water sample is Daqing oilfield formation water, the oil sample is Daqing oilfield wellhead crude oil, the concentration of the nano microemulsion oil displacement agent is 0.2wt.%, and the measuring instrument is a American rotary drop interfacial tensiometer 500 type.
3. Enhanced oil recovery capability measurement: firstly, pumping out saturated water from the bailey core, saturating crude oil, respectively injecting water and water into a slug 0.3PV of a nano microemulsion oil displacement agent aqueous solution (the nano microemulsion oil displacement agent is diluted into 0.5% aqueous solution by water), driving to continuously contain more than 98% of water, stopping the test, and respectively recording the water drive recovery ratio and the recovery ratio achieved by injecting the nano microemulsion oil displacement agent.
The test results are shown in Table 1.
TABLE 1 Performance test results of nanoemulsion displacement agent
From the test results of the examples 1-2, it can be seen that the nano microemulsion oil displacement agent produced by the invention has smaller particle diameter, the minimum can be 20-30nm, and can pass through nano fine throats and micro throats well; the interfacial tension with oil and water can be reduced to 1.0X10 -4 An ultralow oil-water interfacial tension is realized under mN/m; thereby improving the recovery ratio of crude oil by more than 10 percent, and improving the recovery ratio by at least 52 percent compared with water flooding.
Comparing example 1 with the test results of comparative examples 1 to 5, it was found that the content of each component constituting the nanoemulsion oil-displacing agent had a significant effect on the performance of the nanoemulsion oil-displacing agent. The present invention, by means of a smart choice of the content of the individual components, which is also one of the smart contributions of the present invention, has surprisingly found that the technical problem to be solved by the present invention is only solved by microemulsions within the defined content range of the present invention. And adopts the conventional proportion in the field, such as the volume ratio of oil to water is 1:1, or even if the dosages of the surfactant and the cosurfactant are increased, at the cost of increasing the production cost and the use cost, the oil displacement performance equivalent to that of the nano microemulsion oil displacement agent with low production cost cannot be obtained.
Comparing example 1 with the test results of comparative examples 6-8, it can be found that the composition of the nanoemulsion oil-displacing agent has a significant effect on the performance of the nanoemulsion oil-displacing agent. The present invention, by modulating the composition of the microemulsion, which is also another intelligent contribution to the invention, has unexpectedly found that the technical problem underlying the present invention is solved only with microemulsions of the composition defined by the present invention. Even if only minor changes are made to the components constituting the microemulsion, such as the change from Triton X-100 to Triton X-45 and the change from isopropanol to n-butanol, the saponin is not sulfonated, which would obviously deteriorate the performance of the nanoemulsion oil-displacing agent, and such changes would obviously be unexpected to those skilled in the art.
Comparing example 1 with the test results of comparative examples 9-10, it was found that the synergistic effect of Triton X-100 and sulfonated saponin, which constitute the surfactant, was a further intelligent contribution of the present invention, and the absence of either resulted in a significant deterioration in the performance of the nanoemulsion displacement agent, which was not expected by those skilled in the art based on the prior art.
It should be noted that it is well known in the art that the key to preparing a microemulsion is the formulation, and that the nature of the microemulsion depends primarily on its formulation, and that a change in the nature or amount of any of the components that make up the microemulsion affects the formation and properties of the microemulsion. The inventor of the present invention has made extremely difficult and remarkable creative efforts to obtain the nano-microemulsion oil-displacing agent with the formulation as described above, thereby solving the technical problems described above.
Throughout this disclosure, various publications are referenced. The disclosures of these publications in their entireties are hereby incorporated by reference into this application in order to more fully describe the compounds, compositions and methods described herein.
Various modifications and changes may be made to the compounds, compositions and methods described herein. Other aspects of the compounds, compositions, and methods of the present invention will be apparent from consideration of the specification and practice of the disclosed compounds, compositions, and methods. It is intended that the specification and examples be considered as exemplary.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. A nanometer microemulsion oil displacement agent comprises water, oil, surfactant, isopropanol and sodium chloride; wherein the volume ratio of the oil to the water is 0.8-0.9:1, the concentration of the surfactant is 2.0-2.5 wt.% based on the total weight of the oil and water, the concentration of the isopropanol is 3.0-8.0 wt wt.%, and the concentration of the sodium chloride is 2.0-5.5 wt.%; the surfactant is a combination of polyoxyethylene ether nonionic surfactant and sulfonated saponin; the polyoxyethylene ether nonionic surfactant is Triton X-100, and the mass ratio of Triton X-100 to sulfonated saponin is 5-8: 1.
2. the nanoemulsion oil-displacing agent according to claim 1, wherein the oil is oilfield crude oil, or crude oil diluted with light oil, or C 6 -C 18 Is an alkane of (a).
3. The nanoemulsion oil displacement agent according to claim 1, wherein the oil contains an optional limonene solvent in an amount of 10-30% by volume of the oil.
4. The nanoemulsion oil-displacing agent according to claim 1, wherein the sulfonated saponin is prepared by the following method:
firstly, enabling saponin to contact fuming sulfuric acid for sulfonation reaction, wherein the sulfonation time is 3-6h; then washing with deionized water and absolute ethyl alcohol alternately for 1-2 times, and finally drying; the drying temperature is 50-80 ℃ and the drying time is 1-3h.
5. The nanoemulsion oil-displacing agent according to claim 1, wherein the concentration of the surfactant is 2.2wt.%, the concentration of the isopropyl alcohol is 4.0-7.0 wt wt.%, and the concentration of the sodium chloride is 3.0-5.0 wt.%.
6. The method for preparing the nano-microemulsion oil displacement agent according to any one of claims 1 to 5, comprising the following steps:
1) Preparing an emulsion: according to the metering ratio, firstly mixing and stirring oil and water, then adding a surfactant and sodium chloride, and uniformly stirring to obtain emulsion;
2) Preparing a microemulsion: adding isopropanol according to the metering ratio, stirring uniformly, and standing to obtain the homogeneous microemulsion.
7. Use of the nanoemulsion oil-displacing agent according to any one of claims 1-5 or the nanoemulsion oil-displacing agent prepared by the preparation method according to claim 6 for increasing crude oil recovery ratio.
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| CN116103029A (en) * | 2021-11-10 | 2023-05-12 | 中国石油天然气集团有限公司 | Microemulsion system and preparation and application thereof |
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| CN114854383B (en) * | 2022-04-20 | 2023-10-20 | 海南粤鲁石油装备技术服务有限公司 | Insoluble scale dispersion blocking removal system and application method thereof |
| CN114854382B (en) * | 2022-04-20 | 2023-12-12 | 大庆华理生物技术股份有限公司 | Low-permeability oil reservoir bio-based microemulsion blocking removal and injection enhancement system and injection process thereof |
| CN115029121B (en) * | 2022-05-07 | 2023-08-08 | 西南石油大学 | Modified Chinese honeylocust fruit emulsifier and preparation method thereof |
| CN116410726A (en) * | 2023-04-12 | 2023-07-11 | 西南石油大学 | High-efficiency heavy oil displacement agent and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06279781A (en) * | 1993-03-29 | 1994-10-04 | Nippon Suisan Kaisha Ltd | Separation and recovery of highly unsaturated fatty acid by emulsion liquid film method |
| CN1147007A (en) * | 1996-07-23 | 1997-04-09 | 山东大学 | Oil-displacing agent and its preparing process |
| CN102925126A (en) * | 2011-08-09 | 2013-02-13 | 中国石油大学(北京) | Saponin-containing composite type hydrate anti-agglomerant |
| CN104232049A (en) * | 2014-08-29 | 2014-12-24 | 山东新港化工有限公司 | Microemulsion displacement composition for oilfields |
| CN105331348A (en) * | 2015-12-04 | 2016-02-17 | 西安石油大学 | Homogeneous-phase microemulsion oil-displacing agent applied to low-permeation oil field and preparation method of homogeneous-phase microemulsion oil-displacing agent |
| CN113480985A (en) * | 2021-07-07 | 2021-10-08 | 东营煜煌能源技术有限公司 | Preparation method and application of micro-nano expanded micelle elastic particle oil displacement emulsion |
-
2021
- 2021-05-07 CN CN202110495444.7A patent/CN113214815B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06279781A (en) * | 1993-03-29 | 1994-10-04 | Nippon Suisan Kaisha Ltd | Separation and recovery of highly unsaturated fatty acid by emulsion liquid film method |
| CN1147007A (en) * | 1996-07-23 | 1997-04-09 | 山东大学 | Oil-displacing agent and its preparing process |
| CN102925126A (en) * | 2011-08-09 | 2013-02-13 | 中国石油大学(北京) | Saponin-containing composite type hydrate anti-agglomerant |
| CN104232049A (en) * | 2014-08-29 | 2014-12-24 | 山东新港化工有限公司 | Microemulsion displacement composition for oilfields |
| CN105331348A (en) * | 2015-12-04 | 2016-02-17 | 西安石油大学 | Homogeneous-phase microemulsion oil-displacing agent applied to low-permeation oil field and preparation method of homogeneous-phase microemulsion oil-displacing agent |
| CN113480985A (en) * | 2021-07-07 | 2021-10-08 | 东营煜煌能源技术有限公司 | Preparation method and application of micro-nano expanded micelle elastic particle oil displacement emulsion |
Non-Patent Citations (2)
| Title |
|---|
| inerfacial rheology measured with a spinning drop interfacial rheometer：particularities in more realistic surfactant-oil-water systems close to optimum forum at HLDN=0;Marquez R;《Journal of surfactants and detergents》;第24卷(第4期);第587-601页 * |
| 脂肪醇聚醚表面活性剂降低CO2驱混相压力研究;王芳;《中国优秀硕士学位论文全文数据库 工程科技I辑》(第第6期期);第B019-154页 * |
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