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Surfactant for changing surface wettability of compact sandstone as well as preparation method and application of surfactant

A surfactant and tight sandstone technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing the relative permeability of hydrocarbons in rocks, low temperature resistance, poor salt resistance, etc., to reduce oil and water The interfacial tension, the preparation method is simple and easy, and the effect of improving the recovery degree

Inactive Publication Date: 2017-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, quaternary ammonium salt surfactants (such as CTAB) will make the reservoir wet by oil, thereby reducing the relative permeability of hydrocarbons in rocks; anions (such as petroleum sulfonate) have poor salt resistance and high critical micelle concentration. The interaction with multivalent ions in the formation causes more losses; non-ionic surfactants have poor stability in the formation, are not resistant to high temperatures, and are expensive

Method used

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  • Surfactant for changing surface wettability of compact sandstone as well as preparation method and application of surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Mix 1 weight part of monoglyceride laurate with 32 weight parts of white oil to make an oil phase solvent, then add 5 parts by weight of sodium sulfomethylated lignosulfonate to prepare an oil phase mixed solution;

[0031] 2) Add 23 parts by weight of amidopolyoxyethylene ether magnesium disulfate and 8 parts by weight of methyl polyoxyethylene ether to 51 parts by weight of water, stir and dissolve, adjust the pH value to 9.2, and prepare an aqueous phase solution;

[0032] 3) Add the water phase solution into the oil phase mixed solution, add 0.13 parts by weight of azobisisoheptanonitrile to carry out polymerization reaction, stir and heat up to 70°C, and react at this temperature for 17 hours to obtain a polymer Polymer; wherein, the mass ratio of the aqueous phase solution to the oil phase mixed solution is 1:2.2;

[0033] 4) Mix 50 parts by weight of 3-trimeric epoxyhexafluoropropanemidopropyl (2-sulfurous acid) ethyl dimethyl ammonium and 17 parts by weight o...

Embodiment 2

[0036] 1) 3 parts by weight of propylene glycol fatty acid ester and 31 parts by weight of isopropanol are mixed to make an oil phase solvent, and then 5 parts by weight of hydroxymethylated calcium lignosulfonate are added to obtain an oil phase mixed solution;

[0037] 2) Add 18 parts by weight of sodium octylphenol polyoxyethylene ether sulfate and 9 parts by weight of polyoxyethyl glyceryl ether to 58 parts by weight of water, stir and dissolve, adjust the pH value to 8.8, and prepare an aqueous phase solution;

[0038] 3) Add the water phase solution into the oil phase mixed solution, add 0.10 parts by weight of benzoyl peroxide to carry out polymerization reaction, stir and heat up to 60°C, and react at this temperature for 15 hours to obtain a polymer polymer matter; wherein, the mass ratio of the aqueous phase solution to the oil phase mixed solution is 1:2.5;

[0039] 4) Mixing 38 parts by weight of 3-trimeric epoxyhexafluoropropaneamidopropyl (2-sulfurous acid) ethyl...

Embodiment 3

[0042] 1) Mix 2 parts by weight of monoglyceride laurate with 40 parts by weight of naphtha to make an oil phase solvent, then add 8 parts by weight of hydroxymethylated calcium lignosulfonate to prepare an oil phase mixed solution;

[0043] 2) Add 16 parts by weight of sodium lauryl alcohol polyoxyethylene ether disulfate and 7 parts by weight of polyoxypropylene glyceryl ether to 55 parts by weight of water, stir and dissolve, adjust the pH value to 8.5, and prepare an aqueous phase solution ;

[0044] 3) Add the aqueous phase solution into the oil phase mixed solution, add 0.15 parts by weight of benzoyl tert-butyl peroxide for polymerization reaction, stir and heat up to 65°C, and react at this temperature for 18 hours to obtain High molecular polymer; wherein, the mass ratio of the aqueous phase solution to the oil phase mixed solution is 1:2;

[0045] 4) mixing 45 parts by weight of sodium perfluoropropyl alkyl sulfonate and 20 parts by weight of rhamnolipid to prepare ...

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Abstract

The invention relates to a surfactant for changing surface wettability of compact sandstone as well as a preparation method and an application of the surfactant. An oil phase solution is added to a water phase solution, and a dispersed and uniform phase is realized after 1-2 h under the action of an emulsifier. An initiator is added, the mixture is stirred and heated to 60-75 DEG C and reacts at the temperature for 12-18 h, and a colorless and clear liquid, namely, a high-molecular polymer, is prepared. A fluorocarbon surfactant and a biosurfactant are added at the room temperature, the mixture is stirred continuously for 4 h, and the surfactant for changing surface wettability of the compact sandstone is obtained. By the aid of the surfactant, the oil-water interface tension can be reduced, an oil wetted surface can be changed into a water wetted surface, the adhesion of oil drops on sandstone surfaces can be reduced, the flowability of crude oil in an original stratum can be improved, and the recovery percent of low-permeability oil reservoirs can be increased.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a surfactant for changing the surface wettability of tight sandstone and its preparation method and application. Background technique [0002] my country is rich in tight oil and gas resources. With the continuous progress of exploration and development technology, especially the breakthrough of horizontal well volume fracturing technology, pilot tests of tight oil development have been carried out in Changqing Oilfield, Daqing Oilfield and Tuha Oilfield. Horizontal wells and volume fracturing have become the core technologies for the development of tight reservoirs, but the production degree of the reservoirs is still limited. According to geological analysis, the wettability of rocks in tight reservoirs is generally neutral-slightly oil-wet reservoirs. Rock wettability is one of the important factors controlling the distribution, quantity and flow displacement mechanism o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/68C09K8/90
CPCC09K8/584C09K8/68C09K8/905C09K8/88C09K8/604C09K8/36C09K2208/30
Inventor 郭钢李忠兴慕立俊赵振峰张矿生薛小佳吴江李楷范华波刘锦周晓群鲜晟
Owner PETROCHINA CO LTD
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