DOI: 10.11799/ce202508009
Dynamic directional drilling test for advance pressure relief in strong outburst soft coal seams
GUAN Qiangsheng
Abstract：In gas control in strong outburst soft coal seams,there are serious problems of hole block and methane accumulation and serious orifice and gas overflow frequently.In order to ensure the safety of regional gas control,through match the full spiral pneumatic directional drilling tool,research on technical parameters of pneumatic directional hole forming and coal unstuffing discharge technology of soft coal seam with pressure relief,a set of pneumatic directional drilling supporting coal unstuffing pressure relief technology is formed to carry out advance pressure relief,the field tests were carried out in Jiulishan Mine.The result shows that the use of pneumatic directional drilling technology in advance pressure relief drilling can effectively solve the problem of plugging and blowout in soft coal seam,and no obvious blowout was found during the test.Through a variety of coal unstuffing technology combination application,the dry weight of coal per meter is more than 0.1 t,effectively increases the pressure relief space and improves the gas extraction effect.In the first three months of the monitoring period,the net volume of gas extraction in a single hole exceeded 22000 square meters,the theoretical gas pre-pumping rate of the control range was 37.97.The technolgy has provided a safety guarantee for the subsequent regional gas control.
Keywords：strong outburstsoft coal seamdynamic directional drillingcoal unstuffing techniqueadvance pressure relief
Publication Date：2025-08-20
Online Publishing Date：2025-09-10(First online date of this platform, not the publication date of the document)
Pages：7( 57-63 )