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A microemulsion for releasing water lock damage in low-permeability reservoirs

A technology of microemulsion and oil seepage, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems affecting oil field economic development, water lock pollution, low production of oil wells, etc., to prevent and release water lock damage, protect Oil and gas reservoirs, the effect of high oil-water miscibility

Active Publication Date: 2022-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once external water invades the oil well under a certain pressure during the production operation, causing water lock pollution in the near well area, it is difficult to recover through natural energy, resulting in low production and low liquid of the oil well, which seriously affects the economic development of the oil field
The current release system is mainly aimed at medium-high permeability reservoirs, and the release effect is not ideal for low-permeability reservoirs. Therefore, it is urgent to develop a water lock damage release system suitable for low-permeability reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Preparation of microemulsion for release of water lock damage in low permeability reservoirs

[0018] Component composition and consumption are as follows: 10g nonionic surfactant nonylphenol polyoxyethylene ether, 10g sodium dodecylbenzene sulfonate, 8g alkyl dimethyl betaine (alkyl refers to the alkane that carbon number is 12 Base), 6g ethanol, 8g light diesel oil, 58g water.

[0019] The preparation method is: at room temperature, add the additive into water, stir evenly, and the stirring speed is 20r / min; then, add the nonionic surfactant, stir evenly, the stirring speed is 5r / min; add the anionic surfactant, stir evenly, Stirring speed 5r / min; add stabilizer, stir evenly, stirring speed 5r / min; finally add diesel oil, stir evenly, stirring speed 30r / min, that is a uniform transparent agent, after testing, its performance parameters are as follows: at 20 ℃ , the dissolving ability of colloid is 21mg / L, the oil phase permeability recovery rate of low perm...

Embodiment 2

[0020] Example 2 Preparation of microemulsion for release of water lock damage in low permeability reservoirs

[0021] Component composition and consumption are as follows: 15g nonionic surfactant nonylphenol polyoxyethylene ether, 12g sodium dodecylbenzene sulfonate, 10g alkyl dimethyl betaine (alkyl refers to the alkane that carbon number is 12 Base, that is: dodecyl dimethyl betaine), 8g ethanol, 8g light diesel oil, 47g water.

[0022] The preparation method is: mixing and stirring at room temperature to obtain a uniform transparent agent, which is a microemulsion. After testing, its performance parameters are as follows: at 20°C, the dissolving ability for colloids is 28mg / L, and it is suitable for low-permeability reservoirs after water invasion. The oil phase permeability recovery rate is ≥92%, and the salinity resistance is 25000mg / L.

Embodiment 3

[0023] Example 3 Preparation of microemulsion for release of water lock damage in low permeability reservoirs

[0024] Component composition and consumption are as follows: 20g nonionic surfactant nonylphenol polyoxyethylene ether, 15g sodium dodecylbenzene sulfonate, 15g alkyl dimethyl betaine (alkyl refers to the alkane that carbon number is 12 Base), 10g ethanol, 8g light diesel oil, 32g water.

[0025] The preparation method is: mixing and stirring at room temperature to obtain a uniform transparent agent, which is a microemulsion. After testing, its performance parameters are as follows: at 20°C, the dissolving ability for colloids is 31mg / L, and it is suitable for low-permeability reservoirs after water invasion. The oil phase permeability recovery rate is ≥95%, and the salinity resistance is 20000mg / L.

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Abstract

The invention discloses a microemulsion for releasing water lock damage in low-permeability oil reservoirs, which consists of the following components in weight percentage: 10%-20% non-ionic surfactant, 10%-15% anionic surfactant , 8% ~ 15% stabilizer, 6% ~ 10% additives, 8% diesel, 32% ~ 58% water. The microemulsion used for releasing water lock damage in low-permeability reservoirs of the present invention has high oil-water miscibility, no oil-water two-phase interfacial tension, and can effectively treat low-permeability reservoir near-wellbore water damage and oil phase penetration Recovery rate ≥ 90%. It has high salinity tolerance, and the salinity tolerance is above 20000mg / L. In addition to being able to relieve water invasion damage, it can also dissolve colloidal asphaltenes precipitated near the wellbore, with a dissolution rate of more than 20mg / L. The microemulsion used for releasing water-locking damage in low-permeability oil reservoirs of the present invention can effectively prevent and remove water-locking damage and protect oil and gas formations to the greatest extent.

Description

technical field [0001] The invention relates to a microemulsion used for releasing water lock damage in low-permeability reservoirs, and belongs to the field of low-permeability reservoir exploitation operations. Background technique [0002] With the large-scale development of petroleum, the water content of medium and high permeability reservoirs is gradually increasing. The comprehensive water content of high permeability reservoirs in China is above 92%, and the focus of oil development has shifted to low permeability reservoirs. Due to the small diameter of pore throats in low-permeability reservoirs, the reservoir capillary force is stronger, and there is an order of magnitude gap compared with medium-high permeability reservoirs. Once external water invades the oil well under a certain pressure during the production operation, causing water lock pollution in the near-well area, it is difficult to recover through natural energy, resulting in low production and liquid o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/524
CPCC09K8/524C09K8/584C09K8/602
Inventor 汪庐山刘希明李建兵党娟华张金秋宋志东张君杨景辉李强宋欣
Owner CHINA PETROLEUM & CHEM CORP