王坡煤矿碎软煤层高压氮气定向钻进试验研究
Experimental study on directional drilling with high pressure nitrogen in soft-fragmentized coal seam of Wangpo Coal Mine
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摘要: 针对王坡煤矿煤层胶结性差、破碎特点，开展了碎软煤层高压氮气排渣气动定向钻进试验研究，针对钻进装备选型、气动定向工艺、深孔高风压钻进参数等进行研究；在王坡煤矿3306工作面试验完成4个碎软煤层定向钻孔，其中成功试验气动定向开分支2次，平均日进尺达到82.3 m，最大单班进尺72 m，最大孔深437 m，创造软煤气动定向施工孔深记录。试验效果表明：气动定向钻进技术满足王坡矿碎软煤层顺层定向施工要求，钻孔轨迹精准可控，煤层钻遇率高，钻进深度大，钻孔成孔性好，钻进效率高。Abstract: Aiming at the characteristics of poor cementation and broken seam in Wangpo Coal Mine, the pneumatic directional drilling test of soft-fragmentized coal seam with high-pressure nitrogen slag discharge was carried out. Drilling equipment selection, pneumatic directional technology, deep hole and high wind pressure drilling parameters are studied. In the 3306 working face test of Wangpo Coal Mine, four directional drilling holes of broken soft coal seam were completed, in which the pneumatic directional branch was successfully tested for two times. The average daily footage reached 82.3 m, the maximum single shift footage was 72 m, and the maximum hole depth was 437 m, creating the record of hole depth for soft gas dynamic directional construction. The test results show that the pneumatic directional drilling technology meets the requirements of directional construction along the broken soft coal seam in Wangpo Mine, and the drilling trajectory is accurate and controllable. The coal seam drilling rate is high, the drilling depth is large, the drilling performance is good, and the drilling efficiency is high.
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