Method for improving downhole heating coal seam gas extraction amount

A technology for coal seam gas and extraction volume, which is applied in the field of gas extraction in high-gas and low-permeability inclined coal seams, can solve the problems of complex operation process, poor safety and high cost, and achieves simple operation process, easy acquisition and low cost. Effect

Active Publication Date: 2015-08-26
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, these methods are suitable for the ground, difficult to use in coal mines, and the operation process is complicated and the cost is high
If used in coal mines, the safety is poor

Method used

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  • Method for improving downhole heating coal seam gas extraction amount

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Embodiment Construction

[0018] An example of the present invention will be further described below in conjunction with accompanying drawing:

[0019] As shown in the figure, firstly, a borehole 2 is constructed in the middle of the coal seam 1 with a diameter of Ф90-120mm. Then insert the grouting pipe 3, the grouting pipe 4 and the extraction pipe 5 in sequence into the borehole 2, wherein the front end of the grouting pipe 4 is 3~5m away from the front end of the grouting pipe 3, so as to avoid excessive grouting, and the front end of the extraction pipe 5 0.5 ~ 1.5m away from the front end of the slurry return pipe 4, which can save pipe material. Then inject polyurethane sealing agent 8 into the drill hole 2 where the grouting pipe 3, grout return pipe 4, and extraction pipe 5 are inserted, and pay attention to make the front end of the grouting pipe 3 exceed the front end of the polyurethane 8 by 10~30cm, so that the grout can be easily returned. The polyurethane sealing agent 8 is fully expand...

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Abstract

The invention provides a method for improving the downhole heating coal seam gas extraction amount. The method is particularly applicable to high-gas low-permeability inclined coal seam drilling gas extraction. A drilled hole is formed along the coal seam in an inclined mode. A slurry injection pipe, a slurry returning pipe and an extraction pipe are sequentially inserted into the drilled hole, and the hole orifice is sealed polyurethane; quick lime slurry is injected into the drilled hole through the slurry injection pipe, and slurry injection is not stopped until quick lime slurry flows out of the slurry returning pipe; when the temperature inside the drilled hole is increased to a certain degree, gas inside the coil body on the periphery of the drilled hole is greatly desorbed, at the moment, the quick lime slurry in the hole is discharged through the slurry injection pipe, and the coal seam gas starts to be extracted; when the temperature of the coil body on the periphery of the drilled hole is decreased to cause that the flow of gas inside the extraction pipe is greatly reduced, quick lime slurry is injected into the hole repeatedly, the coal body is heated, the coal seam gas is greatly desorbed, and therefore the gas extraction flow is increased. According to the method for improving the downhole heating coal seam gas extraction amount, the coal seam drilling gas extraction flow can be greatly improved, the coal seal gas extraction standard time is shortened, the slurry sources are wide, the cost is low, the technology is simple, and operation is convenient.

Description

technical field [0001] The invention relates to a method for increasing the gas extraction volume of underground heating coal seams, and is especially suitable for drilling gas drainage in inclined coal seams with high gas and low permeability. Background technique [0002] The gas permeability of coal seams in my country is generally low, which makes it difficult for underground coal seam gas to desorb and enter the coal seam gas drainage boreholes, resulting in low borehole drainage flow rate, which seriously affects the efficiency of coal seam gas drainage in my country. Chinese Invention Patent (Application No. 201210419162.X) discloses a method for improving gas recovery by injecting hot carbon dioxide into coal seams. The method is to inject hot carbon dioxide into coal seams through the ground. A new method of coalbed methane mining, which injects high-temperature nitrogen into the coal seam. The Chinese invention patent (application number 201310032766.3) discloses ...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/24E21F7/00
CPCE21B43/16E21B43/24E21F7/00
Inventor 胡胜勇陈少林冯国瑞付浪张奡高磊崔东林高嫱张钰亭
Owner TAIYUAN UNIV OF TECH
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