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Method for preparing oil displacement agent with amphiphilic surfactant

A surfactant and oil-displacing agent technology, applied in the field of oil-displacing agent preparation, can solve the problems of poor stability of the compound system, easy change of chemical structure, low oil-water interfacial tension, etc., to achieve extended maintenance cycle and service life, high efficiency The effect of anti-deposition ability, good temperature and salt resistance

Inactive Publication Date: 2016-11-09
陈建峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: the current surfactant oil displacement agent is prone to stratification or precipitation in groundwater with high salinity and high calcium and magnesium ions, and at the same time, the chemical structure is easy to change under high temperature conditions, and the compound system Poor stability, easy to produce serious chromatographic separation in the oil displacement process, resulting in poor oil displacement efficiency, provides a method to obtain esterified cellulose by esterification reaction between cellulose and maleic anhydride, so that one end It is lipophilic, and then mixed with sulfamic acid for sulfonation reaction to make the other end hydrophilic, and then the amphiphilic cellulose surfactant can be obtained, and the oil displacing agent is prepared by adding sodium carbonate, gelatin, etc.
The oil displacing agent prepared by the cellulose esterification and sulfonation reaction of the present invention contains hydrophilic and lipophilic groups, has good temperature and salt resistance performance, and is suitable for harsh underground water with high salinity and high calcium and magnesium ions. Reservoir, the chemical structure and complex system are stable at high temperature, and the oil-water interfacial tension is kept low after use, which effectively solves the problem that severe chromatographic separation is easy to occur during the oil displacement process, resulting in poor oil displacement efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First weigh 5g of cellulose and add it to a three-necked flask, mix it with maleic anhydride at a mass ratio of 1:6, disperse the mixture ultrasonically for 3 minutes, add benzyl alcohol to it after dispersing, continue ultrasonically dispersing for 5 minutes, and put In a water bath, add 3g of stannous octoate to the flask after heating to 60°C, keep stirring at this temperature for 6 hours, and take out the reactant after the reaction; then add the above reactant to toluene according to the solid-to-liquid ratio of 1:3, and stir Mix for 2 hours, stir and filter with suction to obtain the filter residue, wash the filter residue 3 times with methanol, put it in an oven after washing and dry it at 65°C for 12 hours to obtain the esterified cellulose; then the esterified fiber prepared above The element was added in the three-necked flask, and 4g of sodium chloroacetate was weighed and mixed with a 20% mass fraction of sulfamic acid solution at a solid-to-liquid ratio of 1...

example 2

[0020]First weigh 7g of cellulose and add it to a three-necked flask, mix it with maleic anhydride at a mass ratio of 1:6, disperse the mixture ultrasonically for 4 minutes, add benzyl alcohol to it after dispersing, continue ultrasonically dispersing for 7 minutes, and put In a water bath, add 7g of stannous octoate to the flask after heating to 65°C, keep stirring at this temperature for 7 hours, and take out the reactant after the reaction; then add the above reactant to toluene according to the solid-to-liquid ratio of 1:3, and stir Mix for 3 hours, stir and filter with suction to obtain the filter residue, wash the filter residue 4 times with methanol, put it in an oven after washing and dry it at 70°C for 14 hours to obtain the esterified cellulose; then the esterified fiber prepared above The element was added in the three-necked flask, and 5g of sodium chloroacetate was weighed and mixed with a 20% mass fraction of sulfamic acid solution at a solid-to-liquid ratio of 1:...

example 3

[0023] First weigh 8g of cellulose and add it to a three-necked flask, mix it with maleic anhydride at a mass ratio of 1:6, disperse the mixture ultrasonically for 5 minutes, add benzyl alcohol to it after dispersing, continue ultrasonically dispersing for 8 minutes, and put In a water bath, add 10g of stannous octoate to the flask after heating to 70°C, keep stirring at this temperature for 8 hours, and take out the reactant after the reaction; then add the above reactant to toluene according to the solid-to-liquid ratio of 1:3, and stir Mix for 3 hours, stir and filter with suction to obtain the filter residue, wash the filter residue 5 times with methanol, put it in an oven after washing and dry it at 75°C for 16 hours to obtain the esterified cellulose; then the esterified fiber prepared above The element was added in the three-necked flask, and 6g of sodium chloroacetate was weighed and mixed with a 20% mass fraction of sulfamic acid solution at a solid-to-liquid ratio of ...

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PUM

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Abstract

The invention discloses a method for preparing an oil displacement agent with an amphiphilic surfactant and belongs to the technical field of oil displacement agent preparation. The method comprises the steps that cellulose and maleic anhydride are used for carrying out an esterification reaction to obtain esterified cellulose, and one terminal of esterified cellulose is made to have a lipophilic property; then esterified cellulose is mixed with sulfamic acid to carry out a sulfonation reaction, the other terminal of esterified cellulose is made to have hydrophilicity, and the amphiphilic cellulose surfactant can be obtained; sdium carbonate, gelatin and the like are added, and the oil displacement agent is obtained. The method has the advantages that the oil displacement agent prepared through cellulose esterification reaction and the sulfonation reaction contains hydrophilic and lipophilic groups, has high temperature resistance and salt tolerance, and is suitable for underground water harsh reservoirs with high hypersalinity and high ionic calcium and magnesium, stable in chemical structure and compound system at a high temperature and capable of maintaining low oil-water interface tension after being used, and the problem that the oil displacement efficiency is poor due to serious chromatographic separation likely to occur in the oil displacement process is solved.

Description

technical field [0001] The invention relates to a method for preparing an oil-displacing agent from an amphiphilic surfactant, and belongs to the technical field of oil-displacing agent preparation. Background technique [0002] Oil displacement agent, an additive used to enhance oil recovery during oil drilling. Commonly used are polymer-based oil displacing agents. For example, ultra-high molecular weight polyacrylamide, with 0.05% aqueous solution, can penetrate into the crevices of oil layers and produce 20% to 30% more oil, roughly 10 barrels (1590L) of crude oil can be produced for every 1kg of oil displacement agent. The staged oil flooding of polymer solution and surfactant (microemulsion of petroleum sulfonate and alcohol) can displace the crude oil in the rock capillary. Water-soluble polymer oil displacement agent, when the temperature is high, the hydrolysis of PAM is serious; when the formation temperature exceeds 75°C, as the formation temperature rises, the ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08B15/06C08B3/12
CPCC09K8/584C08B3/12C08B15/06C09K8/90
Inventor 陈建峰盛海丰王统军
Owner 陈建峰
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