黑龙江宝兴沟金矿区ZK0702钻孔事故处理工艺

The Treatment Process of ZK0702 Drilling Accident in Baoxinggou Gold Mine,Heilongjiang Province

宝兴沟金矿区地层复杂,岩石普遍遭受强烈的风化和蚀变作用,因此在钻探施工过程中,地层孔壁易失稳,造成坍塌和掉块,钻孔护壁困难,经常出现夹钻和埋钻事故。以ZK0702钻孔施工为例,介绍该矿区施工过程中遇到的主要问题和施工难点,通过现场实践,采用打、反、扩、捞相结合的处理工艺,使用PAB无固相冲洗液保护孔壁,成功避免了钻孔事故,并提出预防事故的具体措施,为下一步施工提供参考。

The stratum is complex in Baoxinggou gold mine,and the rocks suffer intense weathering and alteration generally,therefore,the stratum hole wall is easy to be instability in the process of drilling construction,leading to collapse and block out,and the protection of the borehole wall is difficult,so folder and underground drilling accidents usually occur.Taking ZK0702 drilling as an example,we introduce the main problems and construction difficulties encountered in the process of construction.Through on-site practice,we adopt combined treatment process including hitting,anti,expansion and fishing,using solid-free fluid（PAB） to protect hole wall.Finally,we successfully avoid the drilling accident,and propose specific measures to resolve and prevent accidents,it can provide a reference for the next construction.