随钻水力造穴技术工艺模拟与应用  

Process simulation and application of hydraulic cavitation while drilling technology

作　　者：段贺明 王毅 金新 魏宏超 张金宝 DUAN Heming;WANG Yi;JIN Xin;WEI Hongchao;ZHANG Jinbao(China Coal Research Institute,Beijing 100013,China;China Coal Technology and Engineering Group Xi’an Research Institute,Xi’an 710077,China;Central South University,Changsha 410083,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团西安研究院有限公司,陕西西安710077 [3]中南大学,湖南长沙410083

出　　处：《煤矿安全》2022年第4期87-93,共7页Safety in Coal Mines

基　　金：中煤科工集团西安研究院有限公司重点资助项目(2019XAYZD10)。

摘　　要：在提高碎软低透气性煤层瓦斯抽采效率时,传统水力造穴方法需打孔、提钻、下造穴器、提钻再下筛管经行瓦斯抽采;为了解决其工序复杂、危险系数高等问题,进行了Fluent和Lsdyna仿真模拟;结合现场实验确定了适合碎软煤层的水力冲孔技术参数。结果表明:喷嘴直径2.8 mm的空化喷嘴在破煤能力上有优于普通喷嘴;造穴期间冲孔时间维持在30 min/m,将泵压保持在12~20 MPa区间、转速维持在90~110 r/min区间时破煤效果最佳;累计施工钻孔136个,通过计算可得平均冲煤量1.07 t/m,煤层透气性得到大幅度提高。In improving the efficiency of gas extraction from soft and low permeability coal seams,the traditional hydraulic punching method requires drilling,lifting the auger,lowering the hole-making device,lifting the auger and then lowering the screen pipe for gas extraction.In order to solve the problems of its complicated process and high-risk factor,the technical parameters of hydraulic punching suitable for broken soft coal seam are determined by combining simulation results with field experiments based on Fluent and Ls-dyna simulation.The results show that the cavitation nozzle with nozzle diameter of 2.8 mm has better coal breaking ability than the common nozzle;the best effect of breaking coal is achieved when the punching time is maintained at 30 min/m,the pump pressure is kept in the range of 12 MPa to 20 MPa and the rotational speed is maintained in the range of 90 r/min to 110 r/min during the hole making period.A total of 136 drill holes were constructed,and the average coal punching volume of 1.07 t/m was calculated,and the coal seam permeability was greatly improved.

关 键 词：碎软低透 仿真模拟 水力冲孔 技术参数 透气性 

分 类 号：TD713[矿业工程—矿井通风与安全]