等井径钻井技术概述

Overview of monohole drilling technology

徐丙贵 吕明杰 黄翠英 尹洪伟

XU Binggui LV Mingjie HUANG Cuiying YIN Hongwei

中国石油集团钻井工程技术研究院钻井机械所，北京　100095 北京控股磁悬浮技术发展有限公司，北京　100036

Drilling Mechanical Department CNPC Drilling Research Institute, Beijing 100195, China

等井径钻井技术可解决深井、超深井及复杂井的钻遇问题，在不损失井眼尺寸和不影响后续钻井作业的情况下，可降低钻遇风险并改善井身结构，同时能确保目的层的顺利钻达。阐述了等井径钻井技术的最新发展动态，国外已成功实施的现场先导性试验及其施工工艺、配套工具，国内已开展了相关技术研发并完成了关键工具的室内台架试验；介绍了该技术的关键在于膨胀管管材及连接方式的研究、施工工艺及配套工具的研发；分析了该技术在节约钻井成本、提高钻井作业安全可靠性、保护资源和环境等方面的技术优势和较好的市场应用前景；指出该技术与大位移钻井（ERD）技术联合应用，将会大幅度地加快钻井工程的发展进程。

The monohole drilling technique is used to solve the issues of drilling deep, ultra-deep, and complex wells. Since it would not decrease the wellbore radius nor impact the follow-up drilling operation, the technique could decrease the drilling risk and improve wellbore scheme, what is more, ensure reaching the objective formation smoothly. The proceeding of monohole drilling technology was illustrated. The pilot test has been successfully carried out overseas, including the use of operation technology, and drilling tools. Domestically, the related technology RD have been carried out and finished the indoor experiment of key tools. The key of the technique are the expanding tube material, the connection type, operation technology and drilling tools. The advantages of the technique were illustrated, such as saving drilling cost, improving the safety reliance of drilling operation, and protecting environment. It was pointed out that the hybrid of monohole drilling and ERD would significantly quicken the drilling engineering development.