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A method for extracting mine gas from low-permeability coal seams containing faults

A low-permeability and fault technology, applied in mining equipment, gas discharge, mining fluids, etc., can solve the problems of difficulty in obtaining gas drainage, insignificant hydraulic fracturing effect, and low coal seam permeability, reducing costs, The effect of rapid extraction and efficient extraction

Active Publication Date: 2022-07-29
山西潞安环保能源开发股份有限公司常村煤矿
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Problems solved by technology

However, due to the low permeability of the coal seam, the effect of hydraulic fracturing is not obvious, and it is difficult to obtain the ideal gas drainage volume.

Method used

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  • A method for extracting mine gas from low-permeability coal seams containing faults
  • A method for extracting mine gas from low-permeability coal seams containing faults
  • A method for extracting mine gas from low-permeability coal seams containing faults

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Embodiment Construction

[0019] like figure 2 As shown, a method for extracting mine gas from a low-permeability coal seam containing a fault, the steps are as follows:

[0020] 1. Carry out vertical drilling from the ground, arrange the well pattern, the depth of the drilled vertical well reaches the fault zone 2 of the coal seam 1, and the vertical well is connected to the fault zone 2 in the coal seam 1;

[0021] 2. At least two vertical wells shall be constructed, one of which shall be arranged in the descending wall 3 of the fault zone 2, and cemented with sulfoaluminate cement and steel pipe as the heat injection well 5, and the other wells shall be arranged in the rising wall 4 of the fault zone. , using conventional cementing methods as production well C; the distance between heat injection well H and production well C is 60m~500m, heat injection well 5 is connected to any existing high-temperature steam system, and the high-temperature steam system adjusts the water temperature. regulation;...

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Abstract

The invention discloses a coalbed methane thermal mining method in a fault mode. The steps are: constructing a vertical well to a fault zone in the coal seam, so that the vertical well and the natural fault form a U-shaped connection; the vertical well in the descending plate is a heat injection well , using double-speed cement and steel pipe cementing, the vertical well in the rising plate is a extraction well, and cementing by ordinary methods; inject 200 ℃ ~ 400 ℃ high temperature water vapor into the coal seam from the heat injection well to heat the coal seam; Water until the coal seam is heated above 80℃~200℃; CBM and groundwater are extracted from production wells. The invention solves the technical problem that the existing coalbed methane extraction method has low extraction rate and cannot effectively perform coalbed methane extraction.

Description

technical field [0001] The invention belongs to the field of mine gas extraction, in particular to a method for extracting mine gas from a fault-containing low-permeability coal seam. Background technique [0002] Coal mine gas is a flammable gas. It is not only a precious non-renewable resource, but also a major hidden danger that threatens the safety of coal mine production. At present, there are various methods for gas drainage, and the known main drainage methods include: drilling drainage method implemented in underground coal mine tunnels, multi-lateral horizontal well drainage method implemented on the ground, and surface heat injection drainage method and displacement methods. However, since most of the coal fields in our country belong to low permeability coal seams, the gas flow rate is slow, and the conventional gas drainage method is almost ineffective for low permeability coal seams. [0003] In order to increase the permeability of gas in the coal seam, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21F7/00
CPCE21B43/24E21F7/00
Inventor 范红斌王凯白璐李敏邢萌白志鹏杨亮煜李瑞强李任重张超华翟连连
Owner 山西潞安环保能源开发股份有限公司常村煤矿
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