川西气田雷口坡组气藏超深大斜度井钻井关键技术

The key drilling technology of ultra-deep highly deviated well in Leikoupo gas reservior, western Sichuan Basin

王汉卿 胡大梁 黄河淳 刘伟 郑义 田明刚4

中国石化西南石油工程公司重庆钻井分公司，重庆 400042 中国石化西南油气分公司石油工程技术研究院，四川 德阳 618000 中国石化西南油气分公司，四川 成都 610041 中国石化西南石油工程公司临盘钻井分公司，山东 临沂 251507

针对川西气田雷口坡组气藏钻井面临的地层压力体系复杂、上部地层易发生井斜超标、须家河组—小塘子组可钻性差、雷口坡组地层破碎等技术难题，根据地层三压力剖面和井壁稳定性特征，优化必封点设置，形成三开制井身结构设计方案；根据预弯曲动力学原理优化易斜地层钻具组合设计，基于地层可钻性特征开展钻头个性化设计和高效钻头优选，优化形成破碎地层滑动导向轨迹控制技术。将上述技术集成应用于PZ3￣5D井，该井完钻井深7 339 m，平均机械钻速4.28 m/h，钻井周期238.4 d。现场应用表明，超深大斜度井钻井关键技术能够有效保障钻井安全，实现提速提效，为后续大斜度开发井的实施提供技术支撑。

The Leikoupo reservoir in western Sichuan Basin has several drilling difficulties such as complex formation pressures, extra well deviation in upper strata, poor drill ability of Xujiahe-Xiaotangzi strata, and broken strata of Leikoupo etc. Based on the three-pressure profiles and wellbore stability characteristics, the setting positions were optimized to propose the three spud casing program design. The bottom hole assembly were designed by pre-bending dynamics theory to keep borehole vertical, and high efficiency drill bits were designed and selected based on rock drillability. The researchers developed the downhole motor slide-steering trajectory control technology for directional well section. Those techniques were applied to well PZ3-5D which has the total depth of 7339m, average penetration rate of 4.28m/h and drilling operation time of 238.4d. The field application shows that the key drilling technology of ultra-deep highly deviated well can effectively ensure drilling safety, improve penetration rate, and provide important technical supports for subsequent highly deviated wells.

10.6056/dkyqt202004022