地质钻探完全漏失地层处理方式探讨

Discussion on treatment of completely leak strata for geological drilling

地质钻探遇到完全漏失地层时经常采用顶漏钻进和水泥堵漏。提出顶漏钻进可采用孔口长流水、倾倒高稠度浆液、倾倒制泡浆液、钻杆涂抹润滑脂(膏)等干孔段应对措施,水泥堵漏添加抗分散剂、促凝早强剂、缓凝剂、水泥球胶合剂等应对措施。研发了钻孔堵漏小球,从结构特点、操作流程及原理特征进行了说明和探讨,拟解决传统惰性堵漏材料“大颗粒易架桥但不易进裂缝,小颗粒易进裂缝但难承压”的矛盾。

Leakage drilling and cement plugging are often used when geological drilling encounters completely leak formation.It is suggested that the dry hole section measures can be taken for leakage drilling such as long running water at hole opening,pouring high consistency grout,pouring foam slurry and applying grease on drill pipe.While for the cementing plugging,adding anti‑dispersant,hardening accelerating and flash setting agent,retarding agent and cement ball cemedin can be used.The drill hole plugging ball is developed,and the structural characteristics,operation process and principle are explained and discussed,which is intended to solve the contradiction of“arge particles are easy to bridge but hard to enter the crack while small particles are easy to enter the crack but difficult to bear pressure”for the traditional inert plugging material.