A method to realize coalbed surface gas wetting reversal and improve production of coalbed methane wells

A wetting reversal and coal seam technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as expansion, cleat porosity and permeability decrease, so as to prevent clogging and improve Yield, effect of preventing expansion of matrix

Inactive Publication Date: 2016-01-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, methods used for conventional natural gas reservoirs are not applicable to coalbed methane reservoirs
[0004] In addition, some studies have proposed to use polymers to change the surface gas wetting of coal seams, but since coal seams are media with strong adsorption capacity, the adsorption of polymers will cause blockage of coal seam pores and expansion of matrix, and the total cleat pores of coal seams The degree of cleat porosity and permeability is only 1% to 2%. Even if the adsorption of the polymer causes a slight expansion of the matrix, the cleat porosity and permeability will decrease relatively, and the expansion of this matrix is ​​irreversible.

Method used

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  • A method to realize coalbed surface gas wetting reversal and improve production of coalbed methane wells
  • A method to realize coalbed surface gas wetting reversal and improve production of coalbed methane wells
  • A method to realize coalbed surface gas wetting reversal and improve production of coalbed methane wells

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The gas wetting inversion treatment agent is a methanol solution composed of Pingpinga O-10 and fluorocarbon surfactant perfluorooctyl sulfonamide propyl amine oxide, Pingpinga O-10 and perfluorooctyl sulfonamide propyl The amine mass ratio is 3:7, and the solution concentration is 0.1%.

[0038] Coal seam surface gas wetting reversal test method: Firstly, the surface of the coal sample is polished smooth, and then cleaned with ethanol and acetone. Soak in the air-wetting inversion treatment agent, treat at 25°C for 3 hours, and then dry at room temperature.

[0039] In this embodiment, the surface contact angle of the coal sample after the treatment is measured, and the contact angle of the water\air\coal sample system is 103°, such as image 3 As shown, the contact angle of n-decane\air\coal sample system is 94°, such as Figure 4 shown.

Embodiment 2

[0041] As described in Example 1, the difference is that the concentration of the gas-wetting inversion treatment agent solution is 0.2%.

[0042] This embodiment measures the surface contact angle of the coal sample after treatment, and the contact angle of the water\air\coal sample system is 106°, such as Figure 5 As shown, the contact angle of n-decane\air\coal sample system is 98°, such as Figure 6 shown.

Embodiment 3

[0044] As described in Example 1, the difference is that the concentration of the gas-wetting inversion treatment agent solution is 0.3%.

[0045] In this embodiment, the surface contact angle of the treated coal sample is measured, the contact angle of the water\air\coal sample system is 102°, and the contact angle of the n-decane\air\coal sample system is 91°.

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Abstract

The invention relates to a method for improving the yield of a coal-bed gas well by achieving coal-bed surface gas reverse wetting. The method includes the steps of adding a gas reverse wetting treating agent composed of perfluorooctanesulfonamide propyl amine oxide and a leveling agent O to a methyl alcohol solvent or an alcohol solvent to prepare a solution, or adding the gas reverse wetting treating agent to other fluid which enters the well, and pumping the solution into a coal bed. The coal-bed surface is thoroughly soaked into the solution containing the gas reverse wetting treating agent, and therefore liquid wetting property of the coal-bed surface can be effectively converted into gas wetting property, the method is easy and convenient to operate, coal-bed holes can be prevented from being blocked, the matrix can be prevented from being expanded, and the yield of the coal-bed gas well can be remarkably improved.

Description

technical field [0001] The invention relates to a method for realizing the wetting reversal of coal seam surface gas and improving the output of coal seam gas wells, and belongs to the technical field of coal seam gas exploitation. Background technique [0002] Although oil and natural gas account for a large proportion in my country's energy consumption, coal is still the largest energy source in my country. Coal is a fossil fuel, and its mining has considerable risks and safety issues. Coal Industry Since the world's first recorded gas (that is, coal bed methane) outburst occurred in the Issac Mine in France in 1834, gas outbursts to varying degrees have occurred in major coal mining countries in the world. Gas outburst disasters in my country are also very serious. Compared with the major coal-producing countries, my country's coal storage conditions are poor, mainly relying on underground mining. In recent years, with the increase of mining depth, the gas content of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22C09K8/584
Inventor 刘鹏程
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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