顺层瓦斯抽采长钻孔气举排渣模拟试验研究  

Numerical simulation and experimental study on gas lift slag removal in long borehole for bedding gas drainage

作　　者：汪义龙 蔡峰[2] 赵清全 王宗超 WANG Yilong;CAI Feng;ZHAO Qingquan;WANG Zongchao(Huaneng Coal Technology Research Co.,Ltd.,Beijing 100071,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China;Yuwang Coal Mine No.1 Well of Yunnan Diandong Yuwang Energy Co.,Ltd.,Qujing 655500,China)

机构地区：[1]华能煤炭技术研究有限公司,北京100071 [2]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [3]云南滇东雨汪能源有限公司雨汪煤矿一井,云南曲靖655500

出　　处：《煤矿安全》2022年第10期184-190,共7页Safety in Coal Mines

基　　金：华能集团总部科技资助项目(HNKJ21-HF07)。

摘　　要：气举排渣困难及其导致的卡钻、抱钻甚至喷孔事故一直是困扰顺层长钻孔瓦斯抽采技术的重要因素;利用数值仿真与现场试验相结合的方法,对顺层瓦斯抽采长钻孔气举排渣进行了系统研究。研究发现:煤屑粒径较小时,风量和产屑量是煤屑沉积的最主要因素,而对于当煤屑粒径较大时,煤屑沉积受到风量、钻杆转、产屑量3个方面的影响;当风量为500 m^(3)/h时,钻杆转速需要超过80 r/min才能保证有效排渣,而当风量分别为400、300 m^(3)/h时,钻杆的转速需要超过120、200 r/min才能保证有效排渣;为了有效排渣,钻杆的转速应保持在80~120 r/min,且风量应在400 m^(3)/h以上。The difficulties of gas lift slag removal and the accidents caused by sticking drill,holding drill and even jet hole are always the important factors that baffle gas extraction technology of long boreholes along the bedding.In this paper,the numerical simulation and field test are used to study the numerical simulation test of gas lift slag removal in long borehole of bedding gas drainage.It is found that when the particle size of coal cuttings is small,the air volume and chip production are the main factors of coal cuttings deposition,while when the particle size of coal cuttings is large,the coal cuttings deposition is affected by air volume,drill pipe speed and chip production;when the air volume is 500 m^(3)/h,the rotating speed of the drill pipe needs to exceed 80 r/min to ensure effective slag removal,while when the air volume is 400 m^(3)/h and 300 m^(3)/h respectively,the rotating speed of the drill pipe needs to exceed 120 r/min and 200 r/min to ensure effective slag removal;in order to effectively discharge slag,the rotating speed of drill pipe should be kept at 80-120 r/min and the air volume should be more than 400 m^(3)/h.

关 键 词：气举排渣 瓦斯抽采 顺层长钻孔 煤屑沉积 数值模拟 

分 类 号：TD712.63[矿业工程—矿井通风与安全]