摘要
下漏上喷一直是钻井界感到棘手的问题 ,特别是溶洞、裂缝性的恶性井漏 ,上喷介质又为高含H2 S的天然气时 ,更增加了处理井漏的难度和风险。位于四川盆地同福场潜伏构造的同福 6井就是一口典型的这类井 ,该井在钻至井深 82 7m(T1j41)出现井涌 ,压井平稳后钻进至井深 94 7.4 0m(T1j3 1)时出现恶性井漏 ,随后出现下漏上喷的复杂情况 ,多次使用桥塞物泥浆堵漏无效 ,最后演变成了钻具氢脆断裂的险情。文章介绍了该井险情发生的过程 ,分析了处理的难点以及成功使用胶质水泥浆在前减缓漏速 。
The bottom-hole circulation loss and top-hole blowout have been always the difficult problems to drilling circles. Especially, the severe circulation lost caused by solution cavities and fractures and the ejected high-sulphur natural gas have even increased the difficulty and risk of treatment. Well Tongfu-6 being located at Tongfuchang buried structure in Sichuan Basin is a typical high-sulphur natural gas dangerous situation well. The kick occurred in the well when drilled to the depth of 827 m(T1j14); then the severe circulation loss existed in the well when drilled to the depth of 947. 4 m (T1j13) after killing; and then the complicated circumstances of the bottom-hole circulation loss and top-hole blowout occurred. The plugging-up work failed although the bridging material mud was applied for many times, and the dangerous situation of the sulfide stress corrosion cracking of drill string happened finally. The course of dangerou situation occurrence in the well, the analysis of the difficulty in treating, and the technique of applying successfully the gel cement slurry ahead to retard leak-off velocity and the rapid-curing slurry behind to plug up lost circulation zones and high-sulphur gas reservoirs through solidifying quickly are introduced in the paper.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第12期57-58,共2页
Natural Gas Industry
