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钻孔实施到位是煤矿防突工作的基础。但在湖南袁家矿区松软煤层施钻时,由于喷孔导致钻孔缩颈堵孔卡钻,电煤钻孔深一般只能达到6～7 m,而大功率液压钻则只能达到4～5 m。针对这一问题,研制出拖动式下套方式,采用在严重喷孔区段施钻的套管跟进成孔法。其特点是套管与钻杆同时钻进。以黄牛岭矿业有限公司应用为例,分别阐述(钻进、下套钻进和退钻留套)3道工序操作要点及其应用效果。
Borehole implementation in place is the basis for coal mine outbreak work. However, when the soft coal seam in Yuanjia Mining Area of Hunan Province is drilled, the hole drilled in the borehole leads to the constriction of the borehole, which can only reach 6 ~ 7 m deep, while the high-power hydraulic drill can only reach 4 ~ 5 m. In response to this problem, developed a drag-under way, with a serious hole in the drill section of the casing to follow the hole into the law. It is characterized by casing and drill pipe drilling at the same time. Taking Huangniuling Mining Co., Ltd. as an example, the main points of operation of the three processes (drilling, jacketing and reworking) are described separately and their application effects.