摘要
为研究煤层顶板裂隙带发育高度,优选L型采动水平井井位,以寺河煤矿东区工作面为研究对象,利用RFPA-2D软件平台,数值模拟回采后上覆岩层的变形特征和垮落情况,采用钻井液消耗法验证裂隙带高度模拟结果。结果显示,裂隙带发育高度为75.0 m。钻孔实测隙裂带高度为72.5 m,模拟结果与实测结果接近。将L型采动水平井水平段布置在距离煤层顶板47.0~59.0 m的细粒砂岩层中,当工作面回采接近采动水平井时,运行地面抽采设备,可有效缓解井下瓦斯抽放压力。
This paper aims to study the development height of seam roof fracture zone and optimize the L-type horizontal mining well location.The study performs numerical simulation of the deformation characteristics and collapse of the overlying strata after mining using RFPA-2D software platform and based on the case of the working face of the east district of Sihe Coal Mine.The results show that the development height of fracture zone is 75.0 m;drilling fluid consumption method is used to validate the simulation result;the fracture zone height in borehole measures 72.5 m,suggesting that the simulation result is close to the measured result;and the arrangement of the horizontal section of L-type mining horizontal well in a fine sandstone layer 47.0-59.0 m away from the roof of the coal seam could provide an effective relief for the underground gas drainage pressure,due to the operation of surface extraction equipment in the presence of the working face close to the mining horizontal well.
作者
姜伟
Jiang Wei(Shanxi Research Institute of Coal Geological Survey, Taiyuan 030001, China)
出处
《黑龙江科技大学学报》
CAS
2020年第5期476-480,共5页
Journal of Heilongjiang University of Science And Technology
基金
大型油气田及煤层气开发项目(2016ZX05067)。
关键词
裂隙带
发育高度
数值模拟
钻井液消耗法
L型采动水平井
fracture zone
developmental height
numerical simulation
drilling fluid consumption method
L-type mining horizontal well
