王洼103-1号水文地质钻孔极其复杂事故的处理

Treatment method for extremely complex accident at the No. 103-1 hydrogeological borehole in Wangwa Coalmine

摘要:

王洼103-1号水文地质钻孔施工过程中出现沉砂卡钻，在处理卡钻事故过程中又使套铣筒也被卡在钻孔内，强力起拔套铣筒，造成断裂，且断口不平整、倾斜靠边，形成了极其复杂的孔内事故。事故原因是泥浆中含沙量过大所致。另外处理钻铤卡钻时下入的表层套管直径偏小，也给后期处理事故造成了很大困难。根据孔内事故特点，制定了先起拔表层套管，更换大直径表套，再套反套铣筒、钻铤的处理方案。为此专门设计制作了起拔表层套管钻进的主动钻进钻杆、钻头；设计加工了加长套铣筒、扶正事故套铣筒的扶正工具等，及时成功处理好了本次超复杂卡钻事故。本文详细论述了钻孔事故的处理过程及措施，总结了事故教训和处理经验，对于处理类似卡钻事故具有指导和借鉴意义。

Abstract:

The No. 103-1 hydrogeological borehole in Wangwa Coalmine happend a sand jamming accident in the drilling operation. In the process of dealing with the subsequent jamming accident， the casing milling barrel was also jammed in the borehole， and the casing milling barrel broke immediately after being pulled out. The fracture was not even and tilted to the edge， which formed a very complex accident in the borehole.First of all， there was too much sand in the mud. Second， the diameter of the surface casing was too small when the drill collar stuck， which made it difficult to deal with the accident.According to the characteristics of the accident in the hole， this paper introduces the treatment scheme of pulling out the surface casing first， replacing the large diameter surface casing， and then setting back the milling barrel and drill collar.In addition， the active drilling pipe， drill bit， extended casing milling barrel， and centralizing tool for casing milling accident were specially designed and processed， which could deal with the complicated stuck pipe accident successfully in time.This paper discusses in detail the processing process and measures of drilling accidents， summarizes the lessons and experience of the accident， which has a guiding and reference significance for dealing with similar stuck drilling accidents.