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| Application analysis of coal seam gas extraction drilling and sealing technology |
| Li Jianfeng |
| Sima Coal Industry Corporation Ltd., Shanxi Lu'an Mining Group, Changzhi 047500, China |
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Abstract In order to solve the technical problems of large attenuation coefficient and low purity of drilling gas extraction in the 1208 working face of Shanxi Lu'an Mining Group Sima Coal Industry Company, the effect and problems of drilling gas extraction in the downstream coal seam were analyzed and the "two blocking and one injection" drilling closure through technical research was optimized. Through the application effect analysis, it was found that the optimized single-hole gas extraction concentration was 1.0 ~ 1.7 times of the original borehole sealing process, and the pure amount of extraction was 2.2 times of the original borehole sealing process, with significant application results.
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