左伟芹, 李运强, 刘彦伟,等.下向钻孔水渣输运机制与高效抽采试验研究[J].河南理工大学学报（自然科学版）,2023,42(2):19-26.

ZUO W Q, LI Y Q, LIU Y W,et al.Experimental study on water and slag transportation mechanism and high-efficiency extraction in downward boreholes[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):19-26.

下向钻孔水渣输运机制与高效抽采试验研究

左伟芹1,2, 李运强1,2, 刘彦伟1,2, 韩红凯1,2, 贾浩杰1,2

1.河南理工大学 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地，河南 焦作  454000；2.河南理工大学 安全科学与工程学院，河南 焦作  454000

摘要:为了解决煤矿下向钻孔水渣积存导致瓦斯抽采效果差的问题，基于水力排渣、压风排水的分步输运方式，提出下向钻孔高效循环排水排渣新思路，计算水渣输运关键参数，研发下向钻孔水渣输运抽采一体化装备，并在义安煤矿开展现场试验。结果表明：下向钻孔水渣输运抽采一体化装备能有效排出粒径8 mm以内的煤岩屑，无外来水补充10 min内可排净孔内积水；经过排水排渣作业后，抽采单孔瓦斯体积分数由0提高到60%~85%；钻孔内有外来水源补充时，可采用不定期排水排渣，延长钻孔高效抽采时间，通过长时间效果考察可知，抽采体积分数提高了2.8~12.6倍。研究表明，下向钻孔水渣输运抽采一体化装备能够高效排出下向钻孔内的水渣，完成排渣、排水、抽采3种作业状态的快速切换和循环作业，提高下向钻孔抽采效率，为下向孔水力化增透技术和瓦斯高效抽采提供技术保障。

关键词:瓦斯抽采;下向钻孔;水渣输运;抽采效果

doi:10.16186/j.cnki.1673-9787.2021080064

基金项目:国家自然科学基金资助项目（51774119，52174173）；河南省高等学校重点科研项目（19zx003）

收稿日期:2021/08/18

修回日期:2021/11/16

出版日期:2023/03/25

Experimental study on water and slag transportation mechanism and high-efficiency extraction in downward boreholes

ZUO Weiqin1,2, LI Yunqiang1,2, LIU Yanwei1,2, HAN Hongkai1,2, JIA Haojie1,2

1.State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Henan Polytechnic University，Jiaozuo  454000，Henan，China；2.School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:In order to solve the problems of water and slag accumulation and poor effect of gas drainage in downward boreholes，based on step-by-step transportation mode of“water injection slag，pressure air drainage”way，a transportation mechanism of high-efficient circulating water and slag drainage in downhole drilling was put forward.An integrative equipment of downhole drainage and slag extraction was developed，and field tests were carried out in Yian Coal Mine.The results showed that the cuttings with size 8 mm or less could be discharged effectively.The drainage operation could be completed in 10 min without external water supply.After the drainage and slag discharge operation，the concentration of single boreholes was increased from 0 to 60%~85%.When there was additional water source in the borehole，the time of high efficient extraction could be prolonged by using irregular drainage and slag discharge.A long examination of the effects showed that the gas drainage concentration was increased by 2.8~12.6 times.Studies have shown that，the equipment could effectively discharge the water slag accumulated at the bottom of the borehole and the fissure water flowing into the borehole in the process of extraction，and could realize the rapid switching and circulation operation of three working states of slag discharge，water discharge and gas drainage，improve the pumping efficiency of the downhole drilling.This provided technical guarantee for hydraulic anti-permeability technology of down-hole and high-efficiency gas extraction.

Key words:gas drainage;downward borehole;water and slag transportation;effect of gas drainage

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