Clay stabilizer and preparation method thereof

A clay stabilizer and initiator technology, applied in the field of clay stabilizer and its preparation, can solve the problems of short validity period, poor anti-swelling effect, blockage of pore roars, etc., and achieve the effect of low molecular weight and good anti-swelling effect.

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the organoclay stabilizers currently used are straight-chain type. When the molecular weight is large, it is easy to block the pores of medium and low permeability formations. When the molecular weight is small, the anti-swelling effect is poor and the validity period is short.
[0007] Although the existing clay stabilizers have a certain ability to stabilize clay to a certain extent, they are insufficient in terms of long-term effect and use in medium and low permeability reservoirs

Method used

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  • Clay stabilizer and preparation method thereof
  • Clay stabilizer and preparation method thereof
  • Clay stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 60.0g of epichlorohydrin to the reactor, and control the temperature of the reactor at 20°C, add 52.5g of dimethylamine aqueous solution with a mass fraction of 40%, 4.0g of allyltrimethylammonium chloride, 6.0g of γ- (Methacryloyloxy)propyltrimethoxysilane, 1.0g diethylene glycol butyl ether, 59.5g water, add 0.55g of sodium bisulfite after 30min into the reactor, add 1.35g after 3min Ammonium persulfate is reacted at a temperature of 40° C. for 2 to 8 hours. After the reaction is completed, a clay stabilizer is obtained, and the molecular weight of the clay stabilizer is 5,000.

Embodiment 2

[0024] Add 65.0g epichlorohydrin to the reactor, the reactor temperature is controlled at 20°C, add 60.0g dimethylamine aqueous solution with a mass fraction of 40%, 6.0g allyltrimethylammonium chloride, 2.0g γ- (Methacryloyloxy)propyltrimethoxysilane, 1.2g diethylene glycol butyl ether, 206.5g water, add 0.55g sodium bisulfite after 30min into the reactor, add 1.35g after 3min Ammonium persulfate is reacted at a temperature of 40° C. for 2 to 8 hours. After the reaction is completed, a clay stabilizer is obtained, and the molecular weight of the clay stabilizer is 8,000.

Embodiment 3

[0026] Add 70.0g of epichlorohydrin to the reactor, the temperature of the reactor is controlled at 20°C, add 95.0g of dimethylamine aqueous solution with a mass fraction of 40%, 4.0g of allyltrimethylammonium chloride, 2.0g of γ- (Methacryloyloxy)propyltrimethoxysilane, 1.2g diethylene glycol butyl ether, 57.0g water, add 0.99g of sodium bisulfite after 30min into the reactor, add 2.43g after 3min Ammonium persulfate is reacted at a temperature of 40° C. for 2 to 8 hours. After the reaction is completed, a clay stabilizer is obtained, and the molecular weight of the clay stabilizer is 12,000.

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Abstract

The invention relates to a clay stabilizer and a preparation method thereof. Epichlorohydrin, dimethylamine, allyltrimethylammonium chloride and gamma-(methacryloyloxy)propyltrimethoxysilane undergo a reaction under action of an initiator and a hydrolysis inhibitor for hydrolysis inhibition to produce the clay stabilizer. The clay stabilizer is injected into a stratum and then undergoes a hydrolysis reaction to produce a silicon hydroxyl group for a condensation reaction with stratum clay so that clay hydration expansion and dispersion transfer are controlled, anti-swelling effects are good and molecular weight is low. The clay stabilizer is suitable for a low permeability reservoir.

Description

technical field [0001] The invention relates to a clay stabilizer and a preparation method thereof. The clay stabilizer prepared by the invention is suitable for the fields of oil field water injection and anti-swelling. Background technique [0002] The formation contains a certain amount of clay minerals, mainly kaolinite, montmorillonite, illite and chlorite, etc., when these clays encounter external water or water-based substances during oilfield development (water injection, acidification, fracturing) Swelling, dispersion, migration, and plugging of pore channels will occur, resulting in a decrease in formation permeability, and more serious damage to low-permeability reservoirs. In order to reduce the damage to the reservoir, clay stabilizers are often added in oilfields to improve the hydration expansion and dispersion migration of clay. [0003] According to different chemical structures, clay stabilizers can be divided into: inorganic salts, inorganic multi-core po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F226/02C08F230/08C09K8/60C09K8/88
CPCC08F283/00C09K8/607C09K8/882C09K2208/12C08F226/02C08F230/08
Inventor 封心领袁俊秀逯贵广
Owner CHINA PETROLEUM & CHEM CORP
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