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Gas wettability reverse processing agent composition and rock surface wettability reversal method

A gas-moisture reversal and reversal treatment technology, applied in the field of gas reservoirs, can solve problems such as inconvenient use and formation damage, and achieve the effects of avoiding pollution, improving production, and alleviating the effect of liquid lock

Active Publication Date: 2014-09-03
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The surfactants used in the above methods are not effective in converting the core surface to the ideal preferential gas-wet surface, are inconvenient to use, and can cause damage to the formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) Core pretreatment

[0079] The core was sliced ​​with a thickness of 1 cm, and then polished with sandpaper until the surface was smooth.

[0080] (2) Preprocessing steps

[0081] Put the rock core into the pretreatment agent to age for 12 hours; wherein, the pretreatment agent includes 0.2wt% FG10 sodium chloride aqueous solution; the concentration of the sodium chloride aqueous solution is 200000mg / L.

[0082] (3) Wetting reversal step

[0083]Dry the pretreated rock core at 100°C, then put it into the inversion treatment agent for 24 hours; wherein, the inversion treatment agent includes 0.2wt% FG40 ethanol-sodium chloride aqueous solution, the mass of ethanol and sodium chloride aqueous solution The ratio is 1:1, the concentration of sodium chloride aqueous solution is 200000mg / L, and the treated core is obtained.

Embodiment 2

[0085] (1) Core pretreatment

[0086] The core was sliced ​​with a thickness of 1 cm, and then polished with sandpaper until the surface was smooth.

[0087] (2) Preprocessing steps

[0088] Put the rock core into the pretreatment agent to age for 12 hours; wherein, the pretreatment agent includes 0.2wt% FG10 magnesium chloride aqueous solution; the concentration of the magnesium chloride aqueous solution is 200000 mg / L.

[0089] (3) Wetting reversal step

[0090] The pretreated rock core was dried at 100°C, and then placed in an inversion treatment agent for 24 hours; wherein, the inversion treatment agent included ethanol-magnesium chloride aqueous solution of 0.3wt% FG40, and the mass ratio of ethanol and magnesium chloride aqueous solution was 1: 1. The concentration of the magnesium chloride aqueous solution is 200000mg / L, and the treated rock core is obtained.

Embodiment 3

[0092] (1) Core pretreatment

[0093] The core was sliced ​​with a thickness of 1 cm, and then polished with sandpaper until the surface was smooth.

[0094] (2) Preprocessing steps

[0095] Putting the core into a pretreatment agent to age for 10 hours; wherein, the pretreatment agent includes an aqueous solution of 0.1 wt % FG10.

[0096] (3) Wetting reversal step

[0097] Dry the pretreated rock core at 100°C, and then put it into the inversion treatment agent for 20 hours; wherein, the inversion treatment agent includes 0.1wt% FG10 ethanol-water solution, and the mass ratio of ethanol and water is 3:7, Get the processed rock core.

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Abstract

The invention provides a gas wettability reverse processing agent composition and a rock surface wettability reversal method. The gas wettability reverse processing agent composition comprises a water solution of alkylphenol polyoxyethylene ether as a pretreating agent, and an ethanol-water solution of perfluoro ethyl acrylate as a reverse processing agent. By adopting the gas wettability reverse processing agent composition, the gas wettability reversing of the rock surface can be achieved, and the sandstone surface can be effectively converted into gas wettability from liquid wettability.

Description

technical field [0001] The invention relates to the field of gas reservoirs, in particular to a gas-moisture inversion treatment agent composition and a use method thereof, which can improve the output of condensate gas reservoirs and protect oil and gas layers. Background technique [0002] In condensate gas reservoirs, when the pressure near the wellbore is lower than the dew point pressure, the liquid phase will condense near the wellbore, resulting in a severe drop in gas well productivity. Some scholars suggest that the condensate near the wellbore can be removed by injecting carbon dioxide and propane into the area near the wellbore, but this method can only temporarily alleviate the problem and cannot fundamentally solve the problem. Therefore, if the wettability of the area near the wellbore can be changed to gas-wet or neutral gas-humidity to achieve wettability reversal, the productivity of condensate gas reservoirs can be improved. [0003] In 2000, Li, Tang et a...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584E21B43/22
CPCC09K8/58C09K8/584
Inventor 王雷魏新勇王彦玲吴文明王永康李亮廖冲春何星武鹏欧阳冬王瑞金家峰王倩丁保东郭娜马淑芬伍亚军
Owner CHINA PETROLEUM & CHEM CORP
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