穿越多采空区地面钻井抽采试验及井身破断特性分析  

Drainage Test of Surface Drilling Crossing Multi-gobs and Characteristics Analysis of Well Breakdown

作　　者：张占国[1] 李海鉴[2] 刘应科[2] 崔光磊[2] 

机构地区：[1]神华集团有限责任公司安全监察局,北京100000 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》2013年第11期152-154,共3页Safety in Coal Mines

摘　　要：地面钻井是一种高效的瓦斯抽采技术。针对五虎山煤矿开采煤层上方存在多个老采空区的情况,成功应用了偏心钻头配合管靴的跟管钻进工艺,有效解决了钻井穿越采空区的卡钻、埋钻问题,顺利完成钻井施工。地面钻井共抽采瓦斯9 d,累计抽采纯瓦斯2.31×104m3,由于抽采效果不佳而被迫停抽。运用ABAQUS有限元软件研究了采动作用下套管的受力特性,结果表明上覆老采空区位置钻井套管的应力较大,是钻井破断的关键位置。Coalbed methane can be extracted by surface drilling efficiently. According to the situation that there are multiple gobs above the mining seam in Wuhushan Coal Mine, pipe -follow drilling technology using eccentric bit combined with pipe shoe was ap- plied to solve the problems effectively of drill sticking or burying when borehole passed through gob. Based on the pipe - follow drilling technology, surface drilling operation was successfully completed. During the longwall face mining, the surface drilling extracted gas for 9 days, and the accumulated drainage amount of pure gas was 2.31 ~ 104 m3. Due to the poor drainage effect, drainage was forced to stop. The forced characteristics of casing under the action of mining disturbance were researched by using ABAQUS finite element softwaro. The results show that the stress of drilling casing in the position of overlying gob was greater, and this was the key position for the drilling breaking.

关 键 词：采空区瓦斯 地面钻井 跟管钻进 井身破断 

分 类 号：TD712[矿业工程—矿井通风与安全]