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
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[0024] Example 1:
[0025] Such as figure 1 As shown, a method for underground gas injection and extraction of coal seams is to construct a long-distance deep borehole in the center of a 200m long coal seam 3. The borehole is used as a heat injection borehole 5. The depth of the borehole is greater than that of the working face. The strike length is shorter than 70m. 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 working face roadway 2 on the left and right sides is 30m. The heat injection drilling hole 5 is sealed with a hollow heat-insulating tube 7 with a length of 70m. The hollow insulation pipe 7 and the heat injection borehole 5 are filled with high temperature resistant cement grouting. The extraction hole 4 is sealed with an organic material tube 6 with a length of 70m. ...
Example Embodiment
[0026] Example 2:
[0027] Such as figure 2 As shown, a method of underground coal seam gas injection and thermal drainage is to construct two sets of gas from both ends of the working face under the technical condition that the strike length of the working face is large or the drilling technology is backward, and the deep directional drilling cannot be constructed. Heat injection hole 5 and drainage hole 4. The two sets of drilling holes can be butted, or at least separated by 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 hole 5 is sealed with a hollow heat-insulating tube 7 with a length of 70m. The hollow insulation pipe 7 and the heat injection borehole 5 are filled with high temperature resistant cement grouting. The extraction hole 4 is sealed with an organic material tube 6 with a length of 70m. The or...
Example Embodiment
[0028] Example 3:
[0029] Such as image 3 As shown, a method for underground coal seam gas injection and thermal extraction, when the strike length of the working face is too long, a horizontal roadway 8 connecting two working face roadways 2 is constructed in the middle of the coal seam 3. Then, heat injection borehole 5 and drainage borehole 4 are constructed in mining area roadway 1, horizontal roadway 8, and working face roadway 2, respectively. The two sets of boreholes on both sides of the horizontal roadway 8 can be butted or separated by 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 hole 5 is sealed with a hollow heat-insulating tube 7 with a length of 70m. The hollow insulation pipe 7 and the heat injection borehole 5 are filled with high temperature resistant cement grouting. The extraction hole 4 i...
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