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在钻探施工中,常遇到绿泥滑石片岩、滑镁岩、纤维蛇纹岩、绢云母千枚岩、炭质板岩及粘土页岩等水敏岩层.这些岩层一般较松软,亲水性强,吸水膨胀,易造成钻孔缩径和层层脱落形成空膛.钻杆易在空膛处折断.有时因此导致孔段报废,不仅造成经济损失,也耽误了工期. 为防止水敏性岩层的危害,1978年开始研究沥青泥浆.近来室内外试验已取得较好效果.试验证明沥青泥浆具有孔壁造膜、低失水量、低固相、润滑性好等特点,对降低井故,提高台效有显著作用;还
In the drilling, chlorite talc, magmatic rocks, fibrous serpentinite, sericite phyllite, carbonaceous slate and clay shale and other water-sensitive rock formations are often encountered. These rock formations are generally relatively soft and hydrophilic Strong, water swelling, easy to cause the drill hole diameter and the layers off to form a hollow bore pipe easily broken at the empty Department, and sometimes lead to hole scrap, not only cause economic losses, but also delayed the construction period To prevent water sensitivity Rock layer, began to study the asphalt slurry in 1978. Recently indoor and outdoor tests have achieved good results.Experimental results show that the asphalt slurry has pore wall filming, low water loss, low solid phase, good lubricity and other characteristics, to reduce the well, Improve the Taiwan effect has a significant role; also