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我们在东南岔矿区施工中,遇到了井壁掉块、井内涌水和冲洗液漏失等问题.该地区岩层复杂,破碎带多,岩石节理发育,裂隙较大,地下含水层丰富.例如ZK 7号孔在43米深时,孔内发生涌水,稀释泥浆,影响钻进,虽加大泥浆粘度与比重,但难于制止涌水.钻进至78米时,孔内又突然发生漏失,孔口不见返水.增大泥浆粘度达50秒以上仍不见效.投入大量粘泥球堵抹亦无效.后决定灌注水泥,一次灌入400公斤水泥(水泥标号400,水灰比0.4),候凝24小时后,下钻具试钻,孔内无水泥柱,水泥堵漏又告失败.在这种情况下,我们对该孔的地质情况再次进行了分析.该孔地质、水文情况复杂,仅90余米深就穿过了四层破碎带,已揭
In the construction of the Southeast Nancha mining area, we encountered some problems such as block-off in the well wall, gushing water in the well and leakage of washing liquid, etc. The area is characterized by complex rock layers, broken zones, large rock joints, large fissures and rich aquifers, such as ZK 7 Hole at 43 meters deep, the hole gushing water, dilute the mud, affecting drilling, although increasing the viscosity and specific gravity of mud, but difficult to stop the flooding.When drilling to 78 meters, the hole and a sudden loss occurred, the orifice back and forth Increasing the viscosity of the mud for more than 50 seconds is still not effective. Put a lot of sticky mud ball blockage also invalid. After the decision to pour cement, a poured 400 kg of cement (cement 400, water-cement ratio 0.4), wait coagulation 24 hours After the drill test drill, hole without cement column, cement plugging failed again in this case, we again analyzed the geological conditions of the hole.The hole geology and hydrology is complex, only 90 Deep through the four-meter broken belt, has been exposed