静33─侧平71套管侧钻短半径水平井钻井工艺技术

静33─侧平71套管侧钻短半径水平井,是"九五"国家重点科技攻关项目。为开发低渗低产高凝原油,在原静33-71井φ177.8mm套管中,从2060.20m段铣至2067.93m,长度7.73m。打水泥塞后,采用国产工具和仪器从2061.00m定向侧钻短半径水平井,完钻井深2354.82m,垂深2121.36m,水平位移262.32m,水平段长211.05m,曲率半径35~49m,入靶点井斜角89.4°,各项指标全部达到设计要求。试采平均日产原油7.78t,效益显著。文中重点介绍该井的主要施工技术和施工中存在的主要问题。

TECHNOLOGY OF SHORT RADIUM CASING SIDE-TRACKING HORIZONTAL DRILLING IN J-33 SP 71 WELL

This project was one of the key projects included in the 9-th National Five-year Scientific Research Program. In order to exploit low permeability, low potential, high condensation point bearing formations, a side-track operation on 177.8 mm casing in interval of 2060.20~2067.93 m in J-33-71 well was conducted. After the cement plug was drilled out, a short radium horizontal well with start point of 2061.00 m was drilled using domestic tools and instruments. The well had its true final depth of 2354.82 m, vertical depth of 2121.36 m, displacement of 262.32 m, length of horizontal section of 211.05 m, radium of curvature of 35~49 m and inclination at the target point of 89.4°. All the indexes have met the designed requirements. A 7.78 t/d average output of crude oil was obtained at the production test. The main operational cautions and problems in rig-site engineering practices were also described.