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Coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction

A gas drainage, liquid technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of reduced coal seam permeability, affecting coal seam and coalbed methane mining efficiency and safe production, and narrowing of fracture channels, etc. , to increase the probability and danger, eliminate the possibility of gas explosion, and lower the gas injection pressure

Inactive Publication Date: 2015-10-21
LIAONING TECHNICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using deep hole pre-splitting blasting and existing liquid CO 2 Exploding the coal seam to increase permeability, after blasting, it has indeed achieved a certain effect of enhancing permeability, but during the process of absorbing and desorbing methane in the coal seam, the coal body will expand and shrink and deform. , the fracture channel in the coal body shrinks or even closes, and the permeability of the coal seam is further reduced, which seriously affects the mining efficiency and safety of coal seam and coalbed methane

Method used

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  • Coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction
  • Coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction
  • Coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction

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Embodiment

[0031] The liquid CO that promotes gas extraction in this embodiment 2 The secondary permeability enhancement method of coal seam gas injection expansion after blasting is carried out according to the following steps:

[0032] (1) Blasting holes and gas drainage holes are constructed on the working face 7, with a diameter of 100mm. The blasting holes and gas drainage holes are arranged at equal intervals, and the interval between adjacent blasting holes is 7.5m. figure 2 shown;

[0033] (2) Fill the blaster with liquid CO 2 , liquid CO 2 The filling pressure is 8~10MPa, and liquid CO is installed in the blast hole 2 Blaster 9, such as image 3 As shown, the blaster is inserted into the blast hole, and reaches the working surface 7 through the connecting pipe 10, and the hole is sealed with a hole sealer 11, and the blaster is started, and the liquid CO in the main tube 3 of the blaster 2 It quickly gasifies into high-pressure gas within 40ms. When the ultimate pressure o...

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Abstract

The invention belongs to the technical field of coal mine safety, and particularly relates to a coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction. According to the method, blastholes and gas extraction holes are formed in a work face at the same time and formed at equal intervals, and liquid CO2 blasters are mounted in the blastholes to conduct liquid CO2 blasting; then, gas extraction pipes are laid in the gas extraction holes, the gas extraction holes are sealed, air of a coal mine down-hole compressed air system serves as an air source of air injection, coal seam air injection expansion secondary permeability improvement is conducted, the air injection air source is connected into the blastholes, the blastholes are sealed, an air injection and gas extraction system is started, and gas extraction is conducted. By the adoption of the method, gas extraction scalar quantity is greatly increased, and huge economical and social benefits are achieved; meanwhile, the technical process is simple, and the method has very good application and popularization prospects.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a liquid CO 2 Secondary permeability enhancement method of coal seam gas injection expansion after blasting. Background technique [0002] Coal seam anti-permeability is the key technology to improve gas drainage efficiency. Commonly used coal seam anti-permeability methods in the prior art include deep hole pre-splitting blasting, hydraulic fracturing, hydraulic punching and hydraulic slotting, etc. Since the coal seam is a compressible anisotropic dual-medium system composed of pores and fissures, during the implementation of various hydraulic measures in the underground coal seam, when the water pressure is greater than the in-situ stress of the coal seam, the coal body will be destroyed and deformed, and fissures will be generated to achieve anti-permeability Purpose, when the water is discharged from the coal seam, the cracks will be closed again, and t...

Claims

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Application Information

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IPC IPC(8): E21B43/263E21B43/16
Inventor 门金龙周西华赵海波宋东平薄其山白刚
Owner LIAONING TECHNICAL UNIVERSITY
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