Integrated reinforced coal seam gas extraction system and extraction method

A coal seam gas and drainage technology, which is applied in the field of integrated enhanced coal seam gas drainage system, can solve the problems of small crack expansion range, small drainage radius, and inability to desorb gas

Active Publication Date: 2021-05-11
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when hydraulic fracturing is used alone, the depth of the slit is limited, resulting in a small drainage radius. Only a large number of drilled holes can effectively drain the gas. However, hydraulic fracturing alone cannot control the crack initiation position and the cra

Method used

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  • Integrated reinforced coal seam gas extraction system and extraction method
  • Integrated reinforced coal seam gas extraction system and extraction method
  • Integrated reinforced coal seam gas extraction system and extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1, please refer to the attached figure 1 , an integrated enhanced coal seam gas drainage system, including a pulse hydraulic system and a pulse microwave generation system, the pulse hydraulic system mainly includes a pulse control system 1, a water storage tank 6, and a high-pressure water pump 7, and the pulse microwave generation system mainly includes A pulse control system 1, a microwave source 2, and a waveguide 3. The pulse control system 1 is respectively connected to the high-pressure water pump 7 and the microwave source 2 through wires 10, so as to control the pulse hydraulic system and the pulse microwave generation system. The forward pulse output of the pulse control system 1 is the action time of hydraulic measures, and the reverse pulse output is the microwave action time. The waveguide converter of the microwave system has a resonant waveguide slot antenna array. The pulse hydraulic system is connected with the expansion drill pipe 14 through th...

Embodiment 2

[0044] Example 2 is used as a comparison scheme, alternately using hydraulic measures and microwaves to act on the coal body according to the pulse direction, and the existence of microwaves can reduce the output pressure of high-pressure water in hydraulic measures by about 10 MPa, so Example 2 is abandoned.

[0045] figure 2 Shown is the pulse waveform periodogram, image 3 The schematic diagram of the waveguide converter is shown. This method can expand the original pores and fissures, add new fissures, and form more pore and fissure network maps, which is beneficial to gas desorption, increases the gas permeability of the coal seam, and increases the gas extraction volume of the coal seam.

[0046] A pulse microwave-hydraulic slotting-fracturing integrated coal seam permeability enhancement method, through the combination of microwave and pulse hydraulic measures, can generate more micro-cracks in the coal body. The role of microwaves reduces the hardness of the coal sea...

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Abstract

The invention discloses an integrated reinforced coal seam gas extraction system and an extraction method. A pulse microwave generation system and a pulse hydraulic system are combined, the tensile strength of coal rock can be reduced through microwave radiation, the depth of a seam groove for pulse hydraulic cutting is increased, the seam cutting speed is increased, and the crack propagation direction generated by hydraulic fracturing is controlled to a certain extent due to the seam groove; meanwhile, cracks generated by coal body reaming and crack forming and cracks generated by hydraulic fracturing under the guiding effect of the seam groove can be mutually expanded and communicated through microwave radiation, the gas permeability of a coal seam is improved, and the coal seam gas extraction amount is increased; along with the change of the pulse direction, hydraulic measures and microwaves alternately act on a coal body, the crack propagation range is wider, and damage to a drill bit due to continuous repeated hydraulic seam cutting is avoided; and a small amount of high-pressure water acts each time, so that microwave heating is faster, and the coal seam water locking effect caused by the high-pressure water is avoided to a greater extent.

Description

technical field [0001] The invention belongs to the field of coal mine gas prevention and utilization, is applied to high gas, low permeability and hard coal seams, and is specifically an integrated enhanced coal seam gas drainage system and a drainage method. Background technique [0002] Gas drainage is the most effective way to control gas disasters, but the gas permeability of coal seams restricts the gas drainage rate of coal seams. The main feature of most coal seams in my country is low gas permeability. With the increase of mining depth, the gas permeability of coal seams becomes worse and worse, which seriously affects the gas drainage effect. In order to improve the gas extraction rate, the more commonly used method is to increase the gas permeability of the coal seam to increase the amount of gas extraction. The main hydraulic measures used include hydraulic cutting and hydraulic fracturing. However, when hydraulic fracturing is used alone, the depth of the slit ...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/24E21B7/00E21B7/18
CPCE21B43/006E21B43/26E21B43/24E21B7/00E21B7/18
Inventor 林柏泉钟玉婷刘统王一涵曹轩王正白海鑫钟璐斌
Owner CHINA UNIV OF MINING & TECH
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