干法固井的技术难点和对策研究　　

Solutions to technological difficulty of dry wellbore cementing

朱忠喜 杨海平 刘彪 潘丽娟

ZHU Zhongxi YANG Haiping LIU Biao PAN Lijuan

长江大学石油工程学院，湖北武汉　430100 江汉石油管理局，湖北潜江　433124 中石化西北油田分公司工程技术研究院钻井所，新疆乌鲁木齐　830011

Petroleum Engineering College of Yangtze University, Wuhan 430100, China Jianghan Petroleum Administration Bureau, Qianjiang 433124, China Institute of Engineering Technology of Sinopec Northwest Oilfield Branch, Urumqi 830011, China

随着国内干法固井现场试验实例的增多，逐渐暴露出一些问题。结合国内外文献资料和现场施工资料对干法固井技术进行了分析，归纳了干法固井技术优势和技术难点，针对干法固井中存在薄弱地层易塌、漏的难点，提出了正注反灌、插入式固井、双级固井等注水泥浆方案，针对注水泥过程中的强自流效应问题，提出了应用井下节流浮箍的解决方案，降低水泥浆自由下落速度，避免水泥浆上返速度过快带来的井下复杂问题。

With increasing domestic in-situ experiment about dry wellbore cementing, some shortcomings are also gradually exposed. Combined literatures at home and abroad with field construction information and data about dry wellbore cementing, the technical superiority and technical difficulties are summarized in this paper. Aiming at the existing difficulties of collapse and lost circulation of cementing in weak formation for dry wellbore, the technology measures are put forward, including positive injecting and negative infusing cement slurry in empty hole, insert type cementing technique, two-stage primary cement, etc. The downhole throttling floating hoop is suggested to apply to manage the strong gravity effects in the process of cementing for dry wellbore, which can slow the cement slurry free falling speed, and avoid complex downhole problems resulted from excessive high cement slurry flowback speed.