摘要
为了提高地面煤层气井组抽采效率,通过对煤矿井下远端水平对接钻孔的结构设计、钻孔轨迹控制技术及对接工艺技术等施工技术进行研究,利用泥浆脉冲无线随钻测量复合定向钻进技术和主动磁测距技术来实现钻孔轨迹控制、精准对接贯通。结合保德煤矿生产需要施工完成一个主孔孔深为1544 m远端水平对接钻孔,该钻孔成功与地面U型井组直井洞穴顺利连通,首次实现煤矿井下水平定向长钻孔与地面直井远端对接连通,平均日产气量超过3000 m 3。结果表明,主动磁测距技术可以有效的降低定向钻孔轨迹测量累积误差、消除靶点标定误差,实现精确中靶。井下远端水平对接钻孔与地面U型井组直井成功贯通为煤矿区井下和地面井组抽采系统构建了连通通道,降低了煤矿区域瓦斯排采成本,为井下、地面立体式联合抽采模式的应用提供了技术支持。
To improve surface CBM well group drainage efficiency,through coalmine underground distal docking horizontal borehole configuration design,trajectory control and docking technology etc studies,using mud pulse wireless measurement while drilling composite directional drilling and active magnetic ranging technologies have realized borehole trajectory control,accurate docking interpenetration.Combined with production needs of the Baode coalmine has completed a main distal docking horizontal borehole with depth 1544m.The borehole has successfully connected with surface U typed straight well caves,firstly realized coalmine underground horizontal directional long borehole with surface straight well distal docking interpenetration,average daily gas output over 3000m 3.The results have shown that the active magnetic ranging technology can effectively reduce cumulative error in directional borehole trajectory measurement,eliminate target calibration error,and realize accurate bull’s-eye hit.Successful interpenetration of underground distal docking horizontal borehole and surface U typed straight well has established connected channel between coalmine underground and surface well group drainage systems,reduced coalmine area gas drainage cost.The study can provide technological support for application of underground and surface stereo associated drainage mode.
作者
金鑫
郭辉
彭冬
Jin Xin;Guo Hui;Peng Dong(Xi’an Research Institute,China Coal Technology and Engineering Group,Xi’an,Shaanxi 710077)
出处
《中国煤炭地质》
2021年第5期61-63,75,共4页
Coal Geology of China
关键词
煤矿井下
远端水平对接钻孔
无线随钻测量
磁测距技术
复合定向钻进
coalmine underground
distal docking horizontal borehole
wireless measurement while drilling
magnetic ranging technology
composite directional drilling
