采动区远程卸压煤层气地面直井抽采机理分析  

Analysis on Drainage Mechanism of Remote Pressure Released Coal Bed Methane from Surface Vertical Well in Mining Active Area

作　　者：黄华州[1] 桑树勋[1] 李国君[2] 徐宏杰[1] 杨欣超[1] 武杰[1] 吴国代[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008 [2]铁法煤业(集团)有限责任公司,辽宁铁法112700

出　　处：《煤炭科学技术》2010年第3期62-66,共5页Coal Science and Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA06Z220);教育部重大科学技术资助项目(307014)

摘　　要：以淮南矿区为实例,以实现远程卸压煤层气地面直井高效抽采为目的,研究了远距离保护层开采对被保护层的卸压增透作用及远程卸压煤层气解吸、渗流、运移及富集机理。结果表明研究区位于弯曲下沉带内远程卸压煤层气主要来自被保护层中的充分卸压区及部分卸压区,采动造成的层外卸压作用使吸附于煤层中煤层气得到解吸,同时通过采动增加裂隙和减小有效应力的双重作用大幅增加了被保护层渗透性。卸压煤层气采动初期富集于采空区中部的上覆被保护层中;采动后期富集于采空区四周由采动影响线和压实线确定的"O"形圈内。In order to have a high drainage of the remote pressure released coal bed methane from the surface vertical well and taking the Huainan Mining Area as the practice case, the paper studied the pressure released permeability improved function of the protected seam and the desorption, influent, migration and rich collection mechanism of the remote pressure released coal bed methane affected by the re- mote protective seam mining. The results showed that the remote pressure released coal bed methane within the bending subsidence zone of the study area would mainly come from the pressure fully released zone and the pressure partially released zone in the protective seam, the pressure released function caused by the mining activities could make the desorption of the coal bed methane from the seam, the double functions of the cracks increased by the mining and the effective stress reduced by the mining could improve the permeability of the protective seam. The pressure released coal bed methane would be richly located in the protected seam above the goal at the initial mining period. After the mining activities, the pressure released methane would be richly located around the goal within the ＂O＂ ring set by the mining influence line and the compacted line.

关 键 词：卸压煤层气 地面直井 抽采机理 采动区 

分 类 号：TD712.62[矿业工程—矿井通风与安全]