Theory and technology of enhanced coal seam gas production by integrated drilling,hydraulic punching and fracturing in coal mine:Part 2 technology
Shiyao Yu1
Xianbo Su2
Jinxing Song3
Qian Wang4
Zhenjiang You5
1.Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China;Coking Coal Clean Utilization Laboratory Branch of Shanxi Coking Coal Group Co.,Ltd.,Taiyuan 030024,China;Shanxi Provincial Key Laboratory of Intelligent Evaluation and Efficient Utilization of Coking Coal,Taiyuan,030024,China2.Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China;Unconventional Nature Gas Research Institute,Henan Polytechnic University,Jiaozuo 454000,China;School of Energy Resources,China University of Geosciences,Wuhan 430074,China3.School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China4.Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China5.Center for Sustainable Energy and Resources,Edith Cowan University,Joondalup 6027,Australia
摘要：To enhance the efficiency and cost-effectiveness of coal seam gas extraction in coal mines,this study introduces an inte-grated approach combining drilling,hydraulic punching,and fracturing technologies.This method optimizes drilling media tailored to specific coal seams and fine-tunes technical parameters during drilling and permeability improvement processes.Furthermore,it clarifies the relationships among the coal breaking rate,discharge of drill cuttings,jet velocity,rotation speed,and displacement.This ensures precise and effective permeability improvement in both soft and hard coal formations.To implement this technology,a set of high-performance drilling tool with a large inner diameter,high pressure resistance,and superior sealing capabilities has been developed.Consisting of a water braid,drill pipe and hydraulic ejector,this tool meets the requirements of substantial displacement and high pump pressure.Field test results demonstrate remarkable enhancements in borehole formation,coal breaking and slagging efficiency.Specifically,the operation time is reduced by 60％-80％,the coal output is increased by 1-1.5 times,the pure coal seam gas extraction yield is increased by 1-2 times,and the extraction radius expands by more than 100％.These results highlight significant advancements in operational efficiency and perme-ability improvement effects,paving the way for efficient and economical coal seam gas extraction practices.
机标关键词：technologyintegratedproductionpunchingpartseamminecoal
论文发表日期：2025-08-31
在线出版日期：2026-01-30（本平台首次上网日期，不代表文献的发表时间）
页数：12( 121-132 )
英文信息