优快钻完井技术在古龙页岩油开发中的应用

Application of fast and efficient drilling and completion technology in Gulong shale oil

摘要:

松辽盆地古龙页岩油是我国非常规油气增储的核心接替区，具有优质烃源岩发育、纳米级孔喉网络密集、地层压力系数异常高及非均质润湿性显著等地质特征。针对其钻井过程中存在的井壁失稳风险高、轨迹调控精度要求严苛、摩阻扭矩控制难度大等工程挑战，通过优选与研制高效钻井工具，构建精细轨迹调控模型，优化钻井参数，研发适配纳米级孔缝地层的高性能强封堵油基钻井液体系，开发韧性水泥浆体系，集成优快钻完井技术体系，实现高效开发，平均钻速提高29.5%，水平段优质储层钻遇率达90.26%，固井质量优质率提高至90%，确保了页岩油水平井钻进过程中的稳定性与安全性。通过建立学习曲线及时修改完善区块提速技术模板，进一步推动古龙页岩油水平井提速，加快勘探开发进程。

Abstract:

The Gulong shale oil in the Songliao Basin is a core area for unconventional oil and gas reserve increase in China. It is characterized by well-developed high-quality source rocks， dense nanoscale pore-throat system， abnormally high formation pressure coefficients， and heterogeneous wettability. To address challenges including high wellbore instability， stringent trajectory control requirements， and high torque/drag control difficulty during drilling， we optimized and developed efficient drilling tools， built precise trajectory control models， and refined drilling parameters. We also developed a high-performance oil-based drilling fluid system with strong sealing for nano-pore and fracture formations and a resilient cement slurry system. By integrating these fast-drilling and completion technologies， we achieved efficient development. The average drilling speed increased by 29.5%， the success rate of drilling high-quality reservoirs in horizontal sections reached 90.26%， and the excellent cementing quality rate rose to 90%， ensuring stability and safety in shale oil horizontal well drilling. By establishing a learning curve to modify and improve the block-specific speed-up technical template timely， this study further promotes the speed-up of Gulong shale oil horizontal wells and accelerates the exploration and development.