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Gas extraction method using phase change material to assist liquid nitrogen to crack and extraction system

A phase change material and gas extraction technology, applied in gas discharge, mining equipment, mining fluid, etc., can solve the problems of hindering gas extraction, slow melting of coal seam ice, etc., to achieve smooth and efficient discharge, smooth efficiency, and ingenious and reasonable design Effect

Inactive Publication Date: 2019-05-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the extremely low temperature of liquid nitrogen used in the prior art, it will seriously inhibit the gas desorption, and it will cause the ice in the coal seam to melt slowly, forming a water lock effect and hindering the problem of gas extraction

Method used

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  • Gas extraction method using phase change material to assist liquid nitrogen to crack and extraction system

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Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 A gas extraction method using phase change materials to assist liquid nitrogen fracturing is shown, which is characterized in that it includes the following steps:

[0029] 1) drilling a drainage hole 2 in the coal seam 3;

[0030] 2) To establish a drainage system, first extend the steel pipe 6 for inputting the phase change material into the extraction hole 2, then extend the liquid nitrogen pipe 7 for inputting liquid nitrogen into the extraction hole 2, and then insert the The gas drainage pipe 8 extends into the interior of the drainage hole 2; after the steel pipe 6, the liquid nitrogen pipe 7 and the gas drainage pipe 8 are connected, the drainage hole 2 is finally sealed with a hole sealer 5;

[0031] 3) Coal seam fracturing Turn on the liquid nitrogen pump 13, inject liquid nitrogen into the extraction hole 2, and use the low-temperature liquid nitrogen to freeze the coal seam 3 and cause fracturing;

[0032] 4) To heat the coal seam, turn on...

Embodiment 2

[0044] A drainage system for gas extraction from coal seams assisted by liquid nitrogen fracturing with phase change materials, comprising a drainage hole 2 arranged on a coal seam 3, a hole sealing device 5 is arranged in the drainage hole 2, and a steel pipe is additionally arranged 6. The liquid nitrogen pipe 7 and the gas extraction pipe 8 pass through the hole sealer 5 and extend into the extraction hole 2. The outer end of the steel pipe 6 is connected to the storage bin 11, and the outer end of the liquid nitrogen pipe 7 is connected to the Liquid nitrogen tank14.

[0045] In the specific implementation process, after the steel pipe 6, the liquid nitrogen pipe 7 and the gas extraction pipe 8 are inserted into the extraction hole 2 in advance, a hole sealing device 5 is installed outside the extraction hole 2 to seal the hole. Simultaneously, the inner ends of the steel pipe 6, the liquid nitrogen pipe 7 and the gas extraction pipe 8 are arranged in the extraction hole 2...

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Abstract

The invention discloses a gas extraction method using a phase change material to assist liquid nitrogen to crack and an extraction system, wherein the method comprises the following steps of: 1) drilling a hole; 2) establishing the gas extraction system; 3) cracking a coal seam; 4) heating the coal seam; 5) extracting gas. The extraction system comprises a coal bed, wherein an extraction hole is formed in the coal bed; a hole sealing device is arranged in the extraction hole; a steel pipe, a liquid nitrogen pipe and a gas extraction pipe, which penetrate through the hole sealing device, are additionally arranged and extend into the extraction hole; the outer end of the steel pipe is communicated with a storage bin; and the outer end of the liquid nitrogen pipe is communicated with a liquidnitrogen tank. The device has novel conception and ingenious and reasonable design; according to the technical scheme, after the coal bed is cracked through cooling with liquid nitrogen, the coal bedcan be further cracked by heating with a phase change material under the condition of alternate temperature treatment of cold and heat, and the dissociation of the gas can be accelerated, so that thegas is discharged from the coal seam more smoothly and efficiently, and the whole pumping work is safer and more reliable, convenient to operate, smooth and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of gas mining, and in particular relates to a gas drainage method and a drainage system using phase change materials to assist liquid nitrogen fracturing. Background technique [0002] Coal is the main energy source in our country, and the gas disaster associated with coal mining has always been a major problem restricting the safe production of coal mines. With the continuous increase of mining depth and mining intensity, the amount of underground gas gushing out is increasing, the gas exceeding the limit is frequent, and the danger of gas outburst and gas explosion is becoming more and more serious. Efficient extraction of coal seam gas is the fundamental way to prevent and control gas disasters. The national department also puts the gas drainage in the first place, and has formulated the coal mine gas control policy of "draining first, then mining, monitoring and monitoring, and determining production by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
Inventor 柳先锋聂百胜王泽鹏
Owner CHONGQING UNIV
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