Anti-swelling clay stabilizer for water injection in low-permeability reservoirs and preparation method thereof

A clay stabilizer and low-permeability technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as difficulty in using low-permeability oil fields, and achieve the effects of good compatibility, simple synthesis process and low cost

Active Publication Date: 2021-11-16
胜利油田金岛石油工程技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this stabilizer is difficult to use in low permeability oil fields

Method used

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  • Anti-swelling clay stabilizer for water injection in low-permeability reservoirs and preparation method thereof
  • Anti-swelling clay stabilizer for water injection in low-permeability reservoirs and preparation method thereof
  • Anti-swelling clay stabilizer for water injection in low-permeability reservoirs and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: anti-swelling clay stabilizer E 1 and its preparation method

[0032] (1) Anti-swelling clay stabilizer E 1 The composition and components are as follows:

[0033]

[0034] According to existing literature, the synthetic route of described soybean oil modified surfactant is as follows:

[0035]

[0036]

[0037] Among them: R″ is C n h 2n+1 , 0≤n≤15; R' is C m h 2m+1 , 0≤m≤15.

[0038] (2) Anti-swelling clay stabilizer E 1 The preparation method is as follows:

[0039] ①Put 50 parts of water in a beaker and heat it in a constant temperature water bath at 40°C; add 0.1 part of tartaric acid at a stirring rate of 300 rpm, and continue stirring for 10 minutes to obtain a mixed solution;

[0040] ② Adjust the temperature of the above mixed solution to 25°C, slowly add 0.01 part of potassium hydroxide at a stirring rate of 200rpm, and continue to stir for 30 minutes after it is completely added; then raise the temperature to 60°C, and keep the...

Embodiment 2

[0042] Embodiment 2: anti-swelling clay stabilizer E 2 and its preparation method

[0043] (1) Anti-swelling clay stabilizer E 2 The composition and components are as follows:

[0044]

[0045] According to existing literature, the synthetic route of described soybean oil modified surfactant is as follows:

[0046]

[0047]

[0048] Among them: R″ is C n h 2n+1 , 0≤n≤15; R' is C m h 2m+1 , 0≤m≤15.

[0049] (2) Anti-swelling clay stabilizer E 2 The preparation method is as follows:

[0050] ①Put 80 parts of water in a beaker and heat it in a constant temperature water bath at 45°C; add 0.5 parts of tartaric acid at a stirring rate of 320 rpm, and continue stirring for 12 minutes to obtain a mixed solution;

[0051] ② Adjust the temperature of the above mixed solution to 28°C, slowly add 0.08 parts of potassium hydroxide at a stirring rate of 250rpm, and continue stirring for 40 minutes after it is completely added; then raise the temperature to 65°C, and keep ...

Embodiment 3

[0053] Embodiment 3: anti-swelling clay stabilizer E 3 and its preparation method

[0054] (1) Anti-swelling clay stabilizer E 3 The composition and components are as follows:

[0055]

[0056] According to existing literature, the synthetic route of described soybean oil modified surfactant is as follows:

[0057]

[0058]

[0059] Among them: R″ is C n h 2n+1 , 0≤n≤15; R' is C m h 2m+1 , 0≤m≤15.

[0060] (2) Anti-swelling clay stabilizer E 3 The preparation method is as follows:

[0061] ①Put 150 parts of water in a beaker and heat it in a constant temperature water bath at 55°C; add 1.0 part of tartaric acid at a stirring rate of 330 rpm, and continue stirring for 15 minutes to obtain a mixed solution;

[0062] ② Adjust the temperature of the above mixed solution to 26°C, slowly add 0.05 parts of potassium hydroxide at a stirring rate of 220rpm, and continue stirring for 45 minutes after the addition is complete; then raise the temperature to 70°C, and kee...

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Abstract

The invention belongs to the technical field of oil field development, and in particular relates to an anti-swelling clay stabilizer for water injection in low-permeability oil reservoirs and a preparation method thereof. The anti-swelling clay stabilizer is composed of soybean oil modified surfactant, tartaric acid, potassium hydroxide and water It is compounded; wherein, the soybean oil modified surfactant is a quaternary ammonium salt surfactant with a long carbon chain alkyl group and a quaternary ammonium cation. The anti-swelling clay stabilizer of the present invention has the characteristics of wide source of raw materials, simple synthesis process, less dosage, and strong adaptability to oil reservoirs; meanwhile, it has good temperature and salt resistance, can withstand temperatures up to 290°C, and resists salinity up to 220,000mg / L, and has good compatibility with formation water, high anti-swelling rate, and the anti-swelling rate reaches more than 98.0%. Therefore, the present invention can be widely applied to the technical field of oil field exploitation.

Description

technical field [0001] The invention belongs to the technical field of oil field exploitation, and in particular relates to an anti-swelling clay stabilizer for water injection in low-permeability oil reservoirs and a preparation method thereof. Background technique [0002] Improving the development effect of water flooding is one of the key technologies to enhance the recovery of low permeability reservoirs. Clay minerals in low-permeability water-sensitive reservoirs are easy to hydrate and expand, disperse and migrate, and block throats. In low-permeability reservoirs, the reservoir damage caused by water sensitivity will greatly reduce the permeability and make injection difficult. Compared with medium and high permeability reservoirs, the water sensitivity of low and ultra-low permeability reservoirs has a more prominent impact on the development process. Therefore, in the waterflooding development process of low and ultra-low permeability water-sensitive reservoirs,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
CPCC09K8/035C09K2208/12
Inventor 郭卫东冯平亮牛晶晶张静
Owner 胜利油田金岛石油工程技术有限责任公司
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