Coal Engineering ›› 2025, Vol. 57 ›› Issue (8): 57-63.doi: 10. 11799/ ce202508009

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  • Received:2024-10-17 Revised:2025-01-14 Online:2025-08-11 Published:2025-09-11

Abstract:

Aiming at gas control in strong outburst soft coal seam, there is a serious problems of hole block and methane accumulation and serious orifice and gas overflow frequently. In order to ensure the safety of regional gas management, through match the full spiral pneumatic directional drilling tool, research on technical parameters of pneumatic directional hole forming and coal cutting technology of soft coal seam with pressure relief, a set of pneumatic directional drilling supporting coal cutting pressure relief technology is formed to carry out advanced pressure relief, the field tests have been carried out in JIU Lishan Mine. Test shows that the use of pneumatic directional drilling technology in advance pressure relief drilling can effectively solve the problem of plugging and spraying holes in soft coal seams, no obvious orifice was found during the test. Through a variety of coal cutting technology combination application, the dry weight of coal per meter is more than 0.1t, effectively increase the pressure relief space and improved the gas extraction effect. In the first three months of the monitoring period, the net volume of gas extraction in a single hole exceeded 22,000 square meters, the theoretical gas pre-pumping rate of the control range is 37.97 , it provides a safety guarantee for the subsequent regional gas control.

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