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内蒙古锡林浩特市北部胜利煤田的5、6煤组普遍存在漏失现象,尤其是红旗露天矿北侧的部分钻孔,漏失严重,给施工带来很大困难。1983年施工的149~#孔,由于漏失严重,钻孔穿过6煤组后,被迫停钻,没有达到设计深度。1985年我队与东煤地质局哈尔滨科研所联合成立堵漏攻关课题组,在198~#孔试验低比重泥浆,取得明显效果。1986年又在泡沫泥浆中加入惰性材料,进行不停钻堵漏,共封堵4个孔的6层煤,成功率达
In the northern part of Xilinhot, Inner Mongolia, the coal-bearing formations in the coalfield of Shengli Coalfield are generally missing. In particular, some of the northern part of the Hongqi open-pit mine has a large number of boreholes that cause serious leakage and cause great difficulties in construction. In the construction of # 149 ~ # hole in 1983, due to serious loss, drilling through the 6 coal group was forced to stop drilling, did not reach the design depth. In 1985, our team and the Harbin Institute of Science of East China Coal Geology Bureau jointly set up a task team to tackle the problem of plugging, and tested the low specific gravity mud in 198 ~ # holes to achieve remarkable results. In 1986, the inert material was added to the foam mud, which was stopped and plugged. A total of 6 layers of coal with 4 holes were blocked, and the success rate reached