三山岛海上金矿勘查工程ZK3410孔坍塌原因与处理

钻探施工中出现的孔内事故，绝大多数与人的主观因素有关，纯自然事故比较少见。针对三山岛海上金矿勘查工程ZK3410钻孔发生的一起严重孔壁坍塌事故，对其事故原因进行了详细的分析，并采取了一系列的处理措施，增大冲洗液浓度，增强护壁效果；扫孔和清除孔内坍塌物，采用特殊钻具捞取沉淀物，直至孔壁稳定，孔底清洁，钻进正常。实践证明，操作人员的主观意识对预防孔内事故的发生是至关重要的。

Analysis on the Collapse Causes of ZK3410 Hole in Sanshandao Offshore Gold Exploration Project and the Treatment

Most of the hole accidents in drilling construction are related to the human factors, pure natural accident is rela-tively rare.The detail analysis was made on the a serious wall collapse accident in ZK3410 hole of Sanshandao offshore gold exploration project, and a series of measures were taken to deal with the accident.The flushing fluid concentration was in-creased to improve the wall protection effects and hole cleaning was done by dredging the sediment with special drilling tool, until normal drilling operation was returned.The practice proves that the subjective consciousness of the operators is crucial to the hole accidents prevention.