Research on forced gas draining from coal seams by surface well drilling  

作　　者：Wu Dongmei Wang Haifeng Ge Chungui An Fenghua 

机构地区：[1]National Engineering Research Center of Coal Gas Control, China University of Mining ＆ Technology. Xuzhou 221008, China [2]School of Safety Ensineerins. China University of Mining ＆ Technology, Xuzhou, Jiangsu 221008. China [3]Huaibei Mining Group, Huaibei 234113, China

出　　处：《Mining Science and Technology》2011年第2期229-232,共4页矿业科学技术（英文版）

基　　金：supported by the Key Project of the Natural Science Foundation of China(No.70533050 and 51004106);the Fundamental Research Funds for the Central Universities (No.2010QNB02)

摘　　要：Surface drilling was performed at the Luling Coal Mine,in Huaibei,to shorten the period required for gas draining.The experimental study was designed to reduce the cost of gas control by efficiently draining gas from the upper protected layer.The structural arraignment and technical principles of pressure relief via surface drilling are discussed.Results from the trial showed that gas drained from the surface system over a period of 10 months.The total amount of collected gas was 248.4 million m^3.The gas draining occurred in three stages：a growth period;a period of maximum gas production;and an attenuation period.The period of maximum gas production lasted for 4 months.During this time the methane concentration ranged from 60%to 90%and the average draining rate was 10.6 m^3/min.Combined with other methods of draining it was possible to drain 70.6%of the gas from middle coal seam groups.The amount of residual gas dropped to 5.2 m^3/ton,and the pressure of the residual gas fell to 0.53 MPa, thereby eliminating the outburst danger in the middle coal seam groups.The factors affecting pressure relief gas draining by surface drilling were analysed.表面钻在 Luling 煤矿被执行，在 Huaibei，到弄短为煤气的排干要求的时期。试验性的学习被设计由高效地从上面的保护的层排干气体减少煤气的控制的费用。结构的提讯和经由表面钻的压力地势的技术原则被讨论。从试用的结果显示出在 10 个月的一个时期上从表面系统排干的那气体。全部的数量镇定气体是 2.484 亿 m3。排干的气体发生在三个阶段：一个生长时期；最大的煤气的生产的一个时期；并且一个变细时期。最大的煤气的生产的时期持续了 4 个月。在期间这次，甲烷集中从 60% ～ 90%，平均排干率是 10.6 m3/min。与排干它的另外的方法结合了是可能的从中间的煤缝接组排干 70.6% 气体。掉到 5.2 m3/ton 的剩余气体的数量，和剩余气体的压力掉到 0.53 MPa，从而在中间的煤缝接消除爆发危险组织。影响由表面钻排干的压力消除气体的因素被分析。

关 键 词：Surface drilling Pressure relief gas Gas drainage Affecting factors 

分 类 号：TD163.1[矿业工程—矿山地质测量] TJ760.332[兵器科学与技术—武器系统与运用工程]