1 埋钻事故的成因一是钻进中出现坍孔征兆而未被发觉,仍盲目继续钻进。二是长时间停钻未把锥头提出孔外,或正在处理孔内事故,由于处理时间长而忽视了钻孔的维护,致使坍孔埋钻。三是孔内岩粉、钻粉过多。在钻进软岩层时,由于进尺过快,产生大量岩屑,送水量不足,岩粉不能及时排出,又未能及时调整供水量,使岩粉、钻粉聚积过多,沉淀发生埋钻。四是在松散地层中钻 The causes of a buried drill accident First, there was a sign of collapse in the hole without being detected, and still blindly continue drilling. Second, prolonged drilling did not put the cone outside the hole, or is handling the hole accident, due to the long processing time and ignore the maintenance of drilling, resulting in burial collapse hole. Third, hole rock, too much diamond powder. When drilling soft rock layer, due to excessive footage, a large amount of cuttings, insufficient water supply, rock powder can not be discharged in time, but also failed to timely adjust the water supply, so that rock dust, excessive accumulation of diamond powder, sedimentation buried burial occurred. Fourth, drilling in loose formations