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Gas extraction equipment and method based on alternation thought

A technology of gas drainage and gas, applied in the field of gas drainage equipment and drainage based on the concept of rotation, can solve the problems of low gas drainage efficiency and no consideration of the step-by-step displacement of gas, and improve the efficiency of gas drainage. Efficiency, good sealing, and convenient data collection

Inactive Publication Date: 2016-03-30
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
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  • Application Information

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Problems solved by technology

Most of the coal fracturing and drainage equipment in the past only considered fracturing and permeability enhancement, but did not consider the step-by-step displacement of gas in the coal body, and the gas drainage efficiency was low

Method used

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  • Gas extraction equipment and method based on alternation thought
  • Gas extraction equipment and method based on alternation thought
  • Gas extraction equipment and method based on alternation thought

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Embodiment Construction

[0031] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] Such as Figures 1 to 3 As shown, a gas drainage equipment based on the concept of rotation includes a sealed cavity 7, a loading mechanism, a gas supply and control system, a gas rotation and control system, a gas flow dynamic monitoring system, and a data acquisition computer; There is a circular hole in the center of the sealing cover 14 at the upper end of the cavity 7, and the loading column 16 passes through the circular hole to apply load to the coal and rock mass inside the cavity; the gas rotation and control system includes a negative pressure drainage subsystem and a fracturing flooding system. Replacement subsystem, negative pressure drainage subsystem includes gas drainage pump 21, fracturing displacement subsystem includes high pressure water pump 20, aeration tank 4B and fracturing displacement scre...

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Abstract

The invention discloses gas extraction equipment and method based on an alternation thought. The equipment comprises a sealing cavity, a loading mechanism, a gas supplying-controlling system, a gas alternating-controlling system, a gas flow dynamic monitoring system and a data acquiring computer, wherein a circular hole is formed in the center of a sealing cover at the upper end of the sealing cavity; a loading column passes through the circular hole to apply a load to coal-rock mass inside the cavity; the gas alternating-controlling system comprises a negative pressure extraction sub-system and a cracking displacement sub-system; the negative-pressure extraction sub-system comprises a gas extraction pump; the cracking displacement sub-system comprises a high-pressure water pump, an aeration tank and cracking displacement screen pipes; the high-pressure water pump, the aeration tank and the gas extraction pump are connected with the cracking displacement screen pipes of different lengths inside the coal-rock mass through pipelines; the gas supplying-controlling system and the gas flow monitoring system are connected with an aeration pipeline and an extraction pipeline respectively. By adopting the gas extraction equipment and method, hydraulic fracturing permeability improvement of coal mass and alternate gas extraction are realized, and the gas extraction efficiency is increased effectively.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a gas drainage device and a gas drainage method based on the concept of rotation. Background technique [0002] my country's gas-bearing coal seams generally have the characteristics of "two lows and one high", that is, the gas pressure of coal seams is low, the air permeability of coal seams is low, and the adsorption capacity of coal seams for gas is high, which has caused difficulties in underground gas control in coal mines and coal seam gas The extraction efficiency is low. At present, the technologies of coal seam water injection to prevent coal and gas outburst and high-pressure hydraulic fracturing to improve coal seam permeability are being widely used in many mines. The existence of water in coal has a great influence on the amount of gas adsorption. The force between water molecules and coal surface is stronger than that of methane molecules. After water injection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/16E21B43/20E21B43/08E21F7/00F16J15/32
CPCE21B43/006E21B43/08E21B43/168E21B43/20E21F7/00F16J15/3248
Inventor 赵洪宝张欢胡桂林李伟陈磊王飞虎琚楠松郭旭阳
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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