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我队为山西太原市西山矿务局白家庄煤矿打成了一大口径降压孔,钻孔的目的是将采煤区地下水放到深部奥陶纪灰岩层中去,借以降低采煤区地下水压力,使采区不致淹没,工人生产安全. 按地质设计要求,该降压孔井深625m,开孔口径426mm,终孔口径219mm,井斜每100m不超过1°,下两套井壁管. 我们选用的设备为PS-600型水井钻机及BW850/30型泥浆泵.冲洗液用低固相PHP泥浆. 为了保证钻探施工顺利进行,在开孔前用人工挖一个φ1000mm、深7m的大孔,埋下φ425mm井口
Our team built a large-diameter buck hole for Baijiazhuang Coal Mine in Xishan Mining Bureau, Taiyuan, Shanxi Province. The purpose of drilling is to divert the groundwater in the coal mining area to the deep Ordovician limestone layer to reduce the coal mining area According to geological design requirements, the depressurized hole has a depth of 625m, an opening hole diameter of 426mm, a final hole diameter of 219mm and a deviation of not more than 1 ° per 100m of shaft hole, and the next two sets of shaft wall tubes . We chose the equipment for the PS-600-type well drilling rig and BW850 / 30 type mud pump. Low flushing liquid mud with mud. In order to ensure the smooth construction of drilling, digging in the hole before a φ1000mm, deep 7m large Hole, buried φ425mm wellhead