CN109943312B - Oil displacement agent and preparation method thereof - Google Patents
Oil displacement agent and preparation method thereof Download PDFInfo
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- CN109943312B CN109943312B CN201910210070.2A CN201910210070A CN109943312B CN 109943312 B CN109943312 B CN 109943312B CN 201910210070 A CN201910210070 A CN 201910210070A CN 109943312 B CN109943312 B CN 109943312B
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Abstract
An oil displacement agent and a preparation method thereof. The oil displacement agent comprises 3-30 wt% of alcohol ether carboxylate, 10-40 wt% of fatty alcohol-polyoxyethylene ether, 20-65 wt% of quaternary ammonium salt, 0-21 wt% of fatty alcohol-polyoxyethylene ether sodium sulfate, 0-36 wt% of ester sodium salt, 5-25 wt% of sophorolipid and 0-15 wt% of isopropanol. The method comprises the following steps: under the condition of stirring, optionally adding the isopropanol into a container, adding the alcohol ether carboxylate, the fatty alcohol-polyoxyethylene ether, the quaternary ammonium salt, the sophorolipid, the fatty alcohol-polyoxyethylene ether sulfonate, and optionally the fatty alcohol-polyoxyethylene ether sodium sulfate and the ester sodium salt into the container, and stirring until the mixture is colorless and transparent to obtain the oil displacement agent. The oil displacement agent can improve the oil recovery rate of an oil reservoir, and is high-temperature resistant, high-salinity resistant and thick oil resistant.
Description
Technical Field
The application relates to a chemical flooding technology, in particular to an oil displacement agent and a preparation method thereof.
Background
The oil extraction process is divided into three stages: the production process whereby crude oil is pressed out of the surface by the action of the formation pressure is called primary recovery; the exploitation process of improving the formation pressure by gas injection or water injection is called secondary oil recovery; after secondary recovery, a large amount of crude oil remains in the ground and needs to be recovered by physical, chemical and other techniques, which is called tertiary recovery. The tertiary oil recovery is an effective measure for slowing down the aging speed of the oil field and maintaining the stable yield of the crude oil. Chemical flooding has long been recognized as the most suitable method for enhanced recovery of oil fields in the late stages of water flooding development. Chemical flooding is a method for increasing the recovery ratio by adding chemical oil-displacing agents such as polymers, surfactants, alkalis and the like into injected water to change the properties between a displacement fluid and an oil reservoir fluid. However, the existing chemical flooding technology has the characteristics of high medicament cost, poor oil washing effect and low input-output ratio.
Disclosure of Invention
In order to solve the technical problems, the application provides the oil displacement agent which can improve the oil recovery rate of an oil reservoir, and is low in price, stable in performance, high in biodegradation rate and simple in production process.
Specifically, the application provides an oil displacement agent, which comprises the following components in percentage by weight:
in an embodiment of the application, the oil displacement agent may include the following components in percentage by weight:
in embodiments herein, the alcohol ether carboxylate may be selected from any one or more of an alcohol phenol ether carboxylate, a fatty alcohol ether carboxylate, and an isomeric alcohol ether carboxylate.
In embodiments herein, the alcoholic phenol ether carboxylate may include: octyl phenol polyoxyethylene ether (3) carboxylate, octyl phenol polyoxyethylene ether (5) carboxylate, octyl phenol polyoxyethylene ether (7) carboxylate, octyl phenol polyoxyethylene ether (9) carboxylate, octyl phenol polyoxyethylene ether (10) carboxylate, nonylphenol polyoxyethylene ether (3) carboxylate, nonylphenol polyoxyethylene ether (5) carboxylate, nonylphenol polyoxyethylene ether (7) carboxylate, nonylphenol polyoxyethylene ether (9) carboxylate and nonylphenol polyoxyethylene ether (10) carboxylate.
In embodiments herein, the fatty alcohol ether carboxylate may include: dodecyl/tetradecyl alcohol-polyoxyethylene ether (7) carboxylate, dodecyl/tetradecyl alcohol-polyoxyethylene ether (9) carboxylate, hexadecyl/octadecyl alcohol-polyoxyethylene ether (7) carboxylate, hexadecyl/octadecyl alcohol-polyoxyethylene ether (9) carboxylate, octadecyl/hexadecyl alcohol-polyoxyethylene ether (7) carboxylate and octadecyl/hexadecyl alcohol-polyoxyethylene ether (9) carboxylate.
In embodiments herein, the isomeric alcohol ether carboxylate may comprise: isomeric decyl alcohol polyoxyethylene ether (5) carboxylate, isomeric decyl alcohol polyoxyethylene ether (7) carboxylate, isomeric decyl alcohol polyoxyethylene ether (9) carboxylate, isomeric tridecyl alcohol polyoxyethylene ether (5) carboxylate, isomeric tridecyl alcohol polyoxyethylene ether (7) carboxylate and isomeric tridecyl alcohol polyoxyethylene ether (9) carboxylate.
It will be understood by those skilled in the art that the numbers in parentheses in the chemical name of the alcohol ether carboxylate represent the average number of polyoxyethylene ethers and the "/" in the chemical name of the alcohol ether carboxylate represents a mixed carbon, for example, a dodeca/tetradecanolipolyoxyethylene (7) carboxylate represents a fatty alcohol ether carboxylate made from a dodecanoic fatty alcohol, a tetradecanoic fatty alcohol, and 7 polyoxyethylene ethers.
In the embodiment of the present application, the fatty alcohol-polyoxyethylene ether may be a fatty alcohol-polyoxyethylene ether having a polymerization degree of 2 to 9, for example, twelve/fourteen fatty alcohol-polyoxyethylene ether (5), twelve/fourteen fatty alcohol-polyoxyethylene ether (7), twelve/fourteen fatty alcohol-polyoxyethylene ether (9), or the like. It will be understood by those skilled in the art that the numbers in parentheses in the chemical name of fatty alcohol-polyoxyethylene ether indicate the degree of polymerization of polyoxyethylene ether and "/" in the chemical name of fatty alcohol-polyoxyethylene ether indicates mixed carbons, for example, twelve/fourteen fatty alcohol-polyoxyethylene ether (9) fatty alcohol-polyoxyethylene ether made from twelve carbon fatty alcohols, fourteen carbon fatty alcohols, and 9 polyoxyethylene ethers.
In an embodiment of the present application, the quaternary ammonium salt may be a gemini quaternary ammonium salt.
In an embodiment of the present application, the quaternary ammonium salt may be selected from any one or more of propylene-based bis [ (dodecylhydroxyethylmethyl) ammonium chloride ], propylene-based bis [ (dodecyltetradecyldimethyl) ammonium chloride ], propylene-based bis [ (hexadecyldimethyl) ammonium chloride ], ethylene-based bis [ (octadecyldimethyl) ammonium chloride ], ethylene-based bis [ (hexadecylamidodimethyl) ammonium chloride ]. It will be understood by those skilled in the art that the "/" in the chemical name of a quaternary ammonium salt denotes a mixed carbon, for example, the "/" in the ethylene-based bis [ (hexadecyl/octadecyl dimethyl) ammonium chloride ] denotes an alkyl group which is a mixed alkyl group of hexadecyl and octadecyl groups.
In the examples of the present application, the sodium alcohol ether sulfate may be selected from any one or more of sodium lauryl/myristyl alcohol ether (2) sulfate, sodium lauryl/myristyl alcohol ether (3) sulfate, sodium lauryl/myristyl alcohol ether (5) sulfate, sodium lauryl/myristyl alcohol ether (7) sulfate, and sodium lauryl/myristyl alcohol ether (9) sulfate. It will be understood by those skilled in the art that the numbers in parentheses in the chemical name of sodium alcohol ether sulphate represent the average number of polyoxyethylene ethers and the "/" in the chemical name of sodium alcohol ether sulphate represents mixed carbons, for example, sodium lauryl/myristyl alcohol polyoxyethylene ether (2) sulphate represents sodium alcohol ether sulphate made from lauryl fatty alcohol, myristyl fatty alcohol and 2 polyoxyethylene ethers.
In the examples of the present application, the ester sodium salt may be selected from any one or more of docusate sodium (dioctyl sodium sulfosuccinate), disodium laureth sulfosuccinate, and sodium diisooctyl sulfosuccinate.
The application also provides a preparation method of the oil displacement agent, which comprises the following steps: under the condition of stirring, optionally adding the isopropanol into a container, adding the alcohol ether carboxylate, the fatty alcohol-polyoxyethylene ether, the quaternary ammonium salt, the sophorolipid, the fatty alcohol-polyoxyethylene ether sulfonate, and optionally the fatty alcohol-polyoxyethylene ether sodium sulfate and the ester sodium salt into the container, and stirring until the mixture is colorless and transparent to obtain the oil displacement agent.
In the examples of the present application, the components may be stirred at a temperature of 25 to 50 ℃ to be colorless and transparent.
The oil displacement agent of this application can gather on oil water interface fast after getting into the oil reservoir along with injected water, because the oil displacement agent of this application has superstrong interfacial activity, and it forms one deck dispersion with oil, water under the stratum condition, and this dispersion distributes between oil phase and aqueous phase, has oil, the two-phase nature of water concurrently, and oil, water and oil displacement agent inside the dispersion all are nanometer liquid drop. The dispersion can be mutually soluble with oil or water in any proportion, and is only distributed on an oil-water interface under the condition of coexistence of oil and water, so that the interfacial tension between the dispersion and the oil or the water can be reduced to be close to zero by the property between the oil and the water, the difference of capillary force is greatly reduced, the non-uniformity in the displacement process is reduced, the swept surface of the displacement water is increased, and the displacement efficiency is improved.
The oil displacement agent can improve the oil recovery rate of an oil reservoir, and is resistant to high temperature (for example, 85-90 ℃), high salt and heavy oil.
The oil displacement agent has the advantages of low price, stable performance, easy biodegradation of all components, high biodegradation rate of 95 percent and simple production process.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification, claims, and drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a diagram of the results of a blank experiment water sample without an oil displacement agent for core displacement.
Fig. 2 is an experimental result diagram of core displacement performed by using an experimental water sample containing 1% of the oil displacement agent in embodiment 1 of the present application.
FIG. 3 is a diagram of the results of a core displacement experiment using a blank water sample without an oil displacement agent.
Fig. 4 is an experimental result diagram of core displacement performed by using an experimental water sample containing 1% of a common oil displacement agent.
Fig. 5 is an experimental result diagram of core displacement performed by using an experimental water sample containing 1% of the oil displacement agent in embodiment 2 of the present application.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The raw materials and reagents used in the following examples are all common commercial products unless otherwise specified.
The following examples are given to prepare 100kg of an oil-displacing agent.
Example 1
Starting stirring of the stirring reaction kettle, firstly adding 6kg of isopropanol into the stirring reaction kettle, then adding 30kg of nonylphenol polyoxyethylene ether (9) carboxylate, 15kg of dodecyl/tetradecyl alcohol polyoxyethylene ether (9), 20kg of propylidene bis [ (dodecyl hydroxyethyl methyl) ammonium chloride ], 11kg of dodecyl/tetradecyl alcohol polyoxyethylene ether (2) sodium sulfate, 10kg of docusate sodium and 8kg of sophorolipid into the stirring reaction kettle, maintaining the temperature of the stirring reaction kettle at 30 ℃, and stirring the raw materials until the raw materials are colorless and transparent to obtain the oil displacement agent.
Example 2
Starting stirring of the stirring reaction kettle, firstly adding 6kg of isopropanol into the stirring reaction kettle, then adding 15kg of dodecyl/tetradecyl alcohol polyoxyethylene ether (9) carboxylate, 10kg of dodecyl/tetradecyl alcohol polyoxyethylene ether (5), 50kg of ethylene-based bis [ (octadecyl dimethyl) ammonium chloride ], 6kg of dodecyl/tetradecyl alcohol polyoxyethylene ether (3) sodium sulfate, 8kg of docusate sodium and 5kg of sophorolipid into the stirring reaction kettle, maintaining the temperature of the stirring reaction kettle at 35 ℃, and stirring the raw materials until the raw materials are colorless and transparent to obtain the oil displacement agent.
Example 3
Starting stirring of the stirring reaction kettle, firstly adding 8kg of isopropanol into the stirring reaction kettle, then adding 19kg of isomeric tridecanol polyoxyethylene ether (9) carboxylate, 11kg of dodecyl/tetradecanol polyoxyethylene ether (7), 32kg of ethylene bis [ (hexadecyl amido dimethyl) ammonium chloride ], 5kg of dodecyl/tetradecanol polyoxyethylene ether (2) sodium sulfate, 12kg of disodium lauryl polyoxyethylene ether sulfosuccinate and 13kg of sophorolipid into the stirring reaction kettle, maintaining the temperature of the stirring reaction kettle at 40 ℃, and stirring the raw materials until the raw materials are colorless and transparent to obtain the oil displacement agent.
Example 4
Starting stirring of the stirring reaction kettle, firstly adding 5kg of isopropanol into the stirring reaction kettle, then adding 10kg of isomeric dodecyl polyoxyethylene ether (9) carboxylate, 20kg of dodecyl/tetradecyl fatty alcohol polyoxyethylene ether (9), 15kg of ethylene-based bis [ (hexadecyl dimethyl) ammonium chloride, 20kg of ethylene-based bis [ (hexadecyl amido dimethyl) ammonium chloride ], 12.5kg of sodium dodecyl/tetradecyl fatty alcohol polyoxyethylene ether (3) sulfate, 7.5kg of sodium diisooctyl succinate sulfonate and 10kg of sophorolipid into the reaction kettle, maintaining the temperature of the stirring reaction kettle at 50 ℃, and stirring the raw materials in the reaction kettle to be colorless and transparent to obtain the oil displacement agent.
Performance testing
1. According to the method for measuring the surface and interfacial tension of the oil-displacing agent, which is determined by SY/T5270-1999 surface and interfacial tension determination method of the oil and gas industry standard of the people's republic of China, the oil-water interfacial tension of a blank group without the oil-displacing agent, a common oil-displacing agent (consisting of petroleum sulfonate and fatty alcohol polyoxyethylene ether sulfate) group and the oil-displacing agent group of the embodiment of the application are tested, the adopted test equipment is Sigma 702ET, and the addition amount of the oil-displacing agent is 1 percent. The test results are shown in the following table.
It can be seen that the common oil displacement agent formed by the petroleum sulfonate and the fatty alcohol-polyoxyethylene ether sulfate can reduce the tension between oil-water interfaces, but cannot reduce the tension between the oil-water interfaces to be close to zero.
2. Core displacement experiment
The oil content and the crude oil recovery rate of the blank group containing no oil displacement agent and the oil displacement agent group containing 1 percent of the embodiment 1 are examined according to the oil and gas industry standard SY/T6540-. The experimental conditions are shown in the following table, and the experimental results are shown in fig. 1-2.
| |
50% light oil and 50% thick oil |
| Experimental water sample | Water with medium and low degree of mineralization (degree of mineralization 10,000-30,000TDS) + 0.1% polyacrylamide |
| Test temperature | Middle low temperature (58-62 degree) |
It can be seen that when medium and low salinity water containing polyacrylamide is used as injection water, the oil displacement agent of the embodiment of the application can increase the recovery rate of crude oil from about 70% to about 95%, which shows that the oil displacement agent of the embodiment of the application can significantly increase the recovery rate of crude oil.
The blank group containing no oil-displacing agent, the group containing 1% of a common oil-displacing agent (consisting of petroleum sulfonate and fatty alcohol polyoxyethylene ether sulfate), and the group containing 1% of the oil-displacing agent of example 1 were examined for oil content and crude oil recovery. The experimental conditions are shown in the following table, and the experimental results are shown in fig. 3 to 5.
| |
50% light oil and 50% thick oil |
| Experimental water sample | Medium and high salinity water (salinity 50,000-80,000TDS) + 0.4% polyacrylamide |
| Test temperature | Middle and high temperature (85-90 deg.C) |
It can be seen that when medium-high salinity water containing polyacrylamide is used as injection water, the recovery rate of crude oil can be increased from about 50% to about 70% by using a common oil displacement agent (petroleum sulfonate + fatty alcohol polyoxyethylene ether sulfate), and the recovery rate of crude oil can be increased from about 50% to about 95% by using the oil displacement agent in the embodiment of the application, which indicates that the recovery rate of crude oil can be more remarkably increased by using the oil displacement agent in the embodiment of the application.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (6)
1. An oil displacement agent comprises the following components in percentage by weight:
the quaternary ammonium salt is selected from any one or more of propylene-based bis [ (dodecyl hydroxyethyl methyl) ammonium chloride ], propylene-based bis [ (dodecyl/tetradecyl dimethyl) ammonium chloride ], propylene-based bis [ (hexadecyl dimethyl) ammonium chloride ], ethylene-based bis [ (hexadecyl/octadecyl dimethyl) ammonium chloride ], ethylene-based bis [ (hexadecyl dimethyl) ammonium chloride ], ethylene-based bis [ (octadecyl dimethyl) ammonium chloride ] and ethylene-based bis [ (hexadecyl amido dimethyl) ammonium chloride ];
the ester sodium salt is selected from one or more of docusate sodium, disodium laureth sulfosuccinate and sodium diisooctyl sulfosuccinate.
2. The oil displacement agent according to claim 1, wherein the oil displacement agent comprises the following components in percentage by weight:
3. an oil-displacing agent according to claim 1 or 2, wherein the alcohol ether carboxylate is selected from any one or more of an alcohol phenol ether carboxylate and a fatty alcohol ether carboxylate.
4. The oil-displacing agent according to claim 1 or 2, wherein the sodium fatty alcohol-polyoxyethylene ether sulfate is selected from any one or more of sodium lauryl/tetradecyl fatty alcohol-polyoxyethylene ether (2) sulfate, sodium lauryl/tetradecyl fatty alcohol-polyoxyethylene ether (3) sulfate, sodium lauryl/tetradecyl fatty alcohol-polyoxyethylene ether (5) sulfate, sodium lauryl/tetradecyl fatty alcohol-polyoxyethylene ether (7) sulfate, and sodium lauryl/tetradecyl fatty alcohol-polyoxyethylene ether (9) sulfate.
5. A method of preparing an oil-displacing agent according to any one of claims 1-4, the method comprising: under the stirring condition, adding the isopropanol into a container, adding the alcohol ether carboxylate, the fatty alcohol-polyoxyethylene ether, the quaternary ammonium salt, the sophorolipid, the fatty alcohol-polyoxyethylene ether sodium sulfate and the ester sodium salt into the container, and stirring until the mixture is colorless and transparent to obtain the oil displacement agent.
6. The method according to claim 5, wherein the components are stirred at a temperature of 25-50 ℃ to a colorless and transparent state.
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| CN112708406B (en) * | 2019-10-24 | 2023-01-24 | 中国石油化工股份有限公司 | Biochemical composite blocking remover and preparation method and application thereof |
| CN111826150B (en) * | 2020-07-24 | 2022-06-14 | 山东新港化工有限公司 | High-temperature-resistant viscosity-reduction oil displacement agent for thick oil steam chemical flooding and preparation method and application thereof |
| CN114075702B (en) * | 2020-08-19 | 2023-08-08 | 中国石油化工股份有限公司 | Precursor oiling agent for polyacrylonitrile-based carbon fiber production |
| CN112280546A (en) * | 2020-12-28 | 2021-01-29 | 山东新港化工有限公司 | Low-tension foam oil washing agent and preparation method and application thereof |
| CN115873577B (en) * | 2021-08-26 | 2023-11-28 | 中国石油化工股份有限公司 | Wettability regulator composition and preparation method and application thereof |
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| CN1079486C (en) * | 1999-04-30 | 2002-02-20 | 大庆石油管理局 | Three-component composite displacement system formed from alkali, active agent and polymer and its application in tertiary oil recovery |
| DE102007041204B3 (en) * | 2007-08-31 | 2009-04-30 | Clariant International Limited | Use of composition as corrosion inhibitors containing anionic surfactants and the compositions |
| CN101705081B (en) * | 2009-11-17 | 2012-05-30 | 中国石油天然气股份有限公司 | Gemini quaternary-ammonium-salt water injection increasing agent |
| US20130112409A1 (en) * | 2011-11-08 | 2013-05-09 | Solvay Specialty Polymers Usa, Llc | Proppant particulates and methods of using such particulates in subterranean applications |
| CN103666431B (en) * | 2012-09-05 | 2016-02-10 | 中国石油化工股份有限公司 | Surfactant composition and preparation method thereof |
| CN103666430B (en) * | 2012-09-05 | 2016-04-13 | 中国石油化工股份有限公司 | For the surfactant composition and preparation method thereof of intensified oil reduction |
| CN103965851A (en) * | 2013-02-05 | 2014-08-06 | 中国石油化工股份有限公司 | Composite surfactant and preparation method thereof |
| CN103965853B (en) * | 2013-02-05 | 2016-08-24 | 中国石油化工股份有限公司 | Combined surfactant and preparation method thereof |
| CN104232044B (en) * | 2013-06-17 | 2017-08-11 | 中国石油化工股份有限公司 | Surface activator composition, preparation method and application for tertiary oil recovery |
| CN103555308B (en) * | 2013-11-05 | 2015-12-02 | 河南省科学院高新技术研究中心 | The application of sophorolipid in oil field extracted water Biologic inhibitor |
| US9683164B2 (en) * | 2014-04-21 | 2017-06-20 | Baker Hughes Incorporated | Method of using sophorolipids or mannosylerythritol lipids as acid corrosion inhibitors in well treatment operations |
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| CN106590590B (en) * | 2015-10-20 | 2021-05-11 | 中国石油化工股份有限公司 | Oil displacement composition containing polyether carboxylate surfactant and preparation method thereof |
| US10907106B2 (en) * | 2017-06-21 | 2021-02-02 | Locus Oil Ip Company, Llc | Treatment for upgrading heavy crude oil |
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