现代欠平衡钻井技术

欠平衡钻井是国际上９０年代初再次兴起的提高勘探开发效益的钻井新技术。我国在总结以往经验教训的基础上，近几年来在油、气田勘探开发方面已有一些单位进行了技术研究和现场试验，并取得了显著的效益。文中介绍了欠平衡钻井的基本概念、条件、优点；实现欠平衡钻井的主要方法、关键技术；欠平衡钻井主要装备及其作用；国内外欠平衡井现状和技术水平；并对四川油气田发展欠平衡钻井技术提出了几点建议。

Recent underbalanced drilling technology

Underbalanced drilling is a new drilling technology to increase exploration and development benefit.On the basis of summarizing past drilling experience in China,in recent years,some technical research and field testing are done in oil/gas field exploration and development respect,and outstanding economic benefit is obtained.The paper presents basic concept,condition and advantage of underbalanced drilling;methods and key techniques of realizing underbalanced drilling;discusses main equipment of underbalanced drilling and its action.Meanwhile,status quo and state-of -art of underbalanced drilling are also introduced abroad.Some suggestions are proposed on developing underbalanced drilling technology in Sichuan oil/gas field.