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Method for extracting coal seam gas by underground heat injection

A technology for coal seam gas and coal seam, which is applied in the field of underground coal seam gas extraction, can solve problems such as inability to implement and construction difficulties, and achieve the effects of effective extraction, increasing coal seam gas pressure, and increasing gas flow rate

Inactive Publication Date: 2010-09-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above two methods, to provide a method for underground heat injection and extraction of coal seam gas, which solves the problem that existing mining methods need to drill holes from the ground, which brings great difficulties to construction and cannot be used in special areas. implementation issues, and also provides a method for effectively extracting coal seam gas from low permeability coal seams

Method used

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  • Method for extracting coal seam gas by underground heat injection
  • Method for extracting coal seam gas by underground heat injection
  • Method for extracting coal seam gas by underground heat injection

Examples

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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, a method for downhole heat injection and drainage of coal seam gas is to construct a long-distance deep borehole in the center of a 200m-long coal seam 3, and this borehole is used as a heat injection borehole 5, and the depth of the borehole is lower than that of the working face. The strike length is 70m shorter. On both sides of the heat injection borehole 5, two gas drainage boreholes 4 with the same depth as the heat injection borehole are constructed. The distance between the drainage borehole and the heat injection borehole is 70m. The distance from the roadway 2 of the working face on the left and right sides is 30m. The heat injection drilling 5 is sealed with a hollow heat insulating tube 7, and the length of the sealing tube is 70m. The space between the hollow heat-insulating pipe 7 and the heat-injection borehole 5 is filled with high-temperature-resistant cement grouting. Drainage borehole 4 is sealed with organic material pipe...

Embodiment 2

[0027] Such as figure 2 As shown, a method of downhole heat injection and drainage of coal seam gas is to construct two groups from both ends of the working face under the technical conditions that the working face has a long strike length or the drilling technology is backward, and deep directional drilling cannot be carried out. Heat injection borehole 5 and extraction borehole 4. The two sets of boreholes may be butt-jointed, or at least less than 30m apart. The distance between the drainage borehole 4 and the heat injection borehole 5 is 70m, and the distance from the working face roadway 2 on the left and right sides is 30m. The heat injection drilling 5 is sealed with a hollow heat insulating tube 7, and the length of the sealing tube is 70m. The space between the hollow heat-insulating pipe 7 and the heat-injection borehole 5 is filled with high-temperature-resistant cement grouting. Drainage borehole 4 is sealed with organic material pipe 6, and the length of the s...

Embodiment 3

[0029] Such as image 3 As shown, a method for underground heat injection and drainage of coal seam gas, when the working face length is too long, a transverse roadway 8 connecting two working face roadways 2 is constructed in the middle of the coal seam 3 . Then heat injection borehole 5 and extraction borehole 4 are respectively constructed in mining area roadway 1 , cross roadway 8 , and working face roadway 2 . The two groups of boreholes on both sides of the transverse roadway 8 can be butted, or the distance between them is less than 30m. The distance between the drainage borehole 4 and the heat injection borehole 5 is 70m, and the distance from the working face roadway 2 on the left and right sides is 30m. The heat injection drilling 5 is sealed with a hollow heat insulating tube 7, and the length of the sealing tube is 70m. The space between the hollow heat-insulating pipe 7 and the heat-injection borehole 5 is filled with high-temperature-resistant cement grouting. ...

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Abstract

The invention discloses a method for extracting coal seam gas by underground heat injection, which relates to a method for extracting gas. The method solves the problems that the conventional exploitation method needs to drill holes from the ground so as to bring great difficulty to construction and cannot be implemented in special regions. The method is characterized by comprising the following steps of: constructing mutually spaced heat injection boreholes and extraction boreholes to a coal seam from a mining area tunnel or a working face tunnel under a coal mine, injecting high-temperature steam or superheated water of 80 to 300 DEG C to the coal seam from the heat injection boreholes to heat the coal seam, displacing gas by using the steam and the water to the extraction boreholes, and discharging the gas to an underground gas drainage pipeline after the gas and the water are separated. The invention provides the convenient method for effectively extracting the coal seam gas for the low-permeability coal seam.

Description

technical field [0001] The invention relates to a gas (or called coal bed methane) extraction method, in particular to a method for underground extraction of coal bed gas (coal bed methane) in a low-permeability coal seam. Background technique [0002] Coal mine gas is a flammable gas. It is not only a precious resource, but also the biggest hidden danger that threatens the safe production of coal mines. During the mining process, gas diffuses from the coal seam and gushes out into the tunnel of the mine. When the gas concentration in the tunnel reaches the explosion limit and encounters an open flame, a coal mine gas explosion accident will occur. Underground gas pre-drainage in the coal seam or adjacent coal seams is an effective method to reduce mine gas emission and prevent coal mine gas disasters. At present, the known coal seam gas extraction methods mainly include drilling drainage in the local coal seam, cross-bed drilling drainage in adjacent coal seams, combined ...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/24
Inventor 冯增朝赵阳升赵东吕兆兴康志勤
Owner TAIYUAN UNIV OF TECH
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