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Method for improving yield of coal-bed gas well by achieving coal-bed surface gas reverse wetting

A wetting reversal and coal seam technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as cleat porosity and permeability decline, expansion, etc., to improve production, prevent Clogging, the effect of increasing production capacity

Inactive Publication Date: 2014-01-08
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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  • Method for improving yield of coal-bed gas well by achieving coal-bed surface gas reverse wetting
  • Method for improving yield of coal-bed gas well by achieving coal-bed surface gas reverse wetting
  • Method for improving yield of coal-bed gas well by achieving coal-bed surface gas reverse wetting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0038] The experiment method of coal seam surface gas wetting reversal: first polish the surface of the coal sample smoothly, and then clean it with ethanol and acetone. Soak in the gas wetting reversal 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. 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 reversal treatment agent solution is 0.2%.

[0042] In this example, the surface contact angle of the treated coal sample is measured. The contact angle of the water\air\coal sample system is 106°, such as Figure 5 As shown, the contact angle of the n-decane\air\coal sample system is 98°, such as Image 6 Shown.

Embodiment 3

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

[0045] In this example, the surface contact angle of the coal sample after the treatment was measured. The contact angle of the water\air\coal sample system was 102°, and the contact angle of the n-decane\air\coal sample system was 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 coalbed methane gas to increase the output of a coalbed methane well, and belongs to the technical field of coalbed methane mining. Background technique [0002] Although oil and natural gas account for a large proportion of my country's energy consumption, coal is still my country's largest energy source. Coal is a fossil energy source, and its mining has considerable risks and safety issues. Coal industry Since the world’s first recorded gas (ie, coalbed methane) outburst occurred in the French Isaac Mine in 1834, all major coal mining countries in the world have experienced gas outbursts of varying degrees. The gas outburst disaster in my country is also very serious. Compared with the major coal-producing countries, my country’s coal storage conditions are poor and mainly rely on well mining. In recent years, with the increase of mining depth, coal seam gas content has gradually i...

Claims

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Application Information

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