石油地质与工程2026，Vol.40Issue(1)：109-114,6.DOI:10.26976/j.cnki.sydz.202601016
川南筇竹寺组超深层页岩气水平井油层套管固井关键技术
Key technology for cementing casing in ultra deep shale gas horizontal wells of ChuannanQiongzhusi Formation
摘要
Abstract
The Cambrian Qiongzhusi Formation in southern Sichuan is the most favorable shale gas exploration and development layer after the Silurian Longmaxi Formation.The target layer,Qiongzhusi Formation,is buried at a depth of 4 000-4 500 meters,with developed geological fractures,well leakage,and gas invasion coexisting,and a narrow safe density window.The cementing construction of oil reservoir casing faces technical challenges such as difficulty in safely inserting the casing,difficulty in maintaining stable pressure and preventing leakage and gas channeling in the horizontal section,and difficulty in flushing the oil-based drilling fluid,which affects the quality of cement bonding.To this end,by establishing a risk classification evaluation standard for the safe insertion of shale gas horizontal well oil casing,scientifically guiding the technical measures for well opening,strengthening the technical measures for well opening,and adopting the rotating casing process to ensure the safe insertion of oil casing,optimizing the dual setting dual density anti gas channeling toughness cement slurry system to achieve leak prevention and pressure stability,and using oil displacement type anti pollution flushing isolation fluid to improve displacement efficiency and cement bonding quality.This series of supporting technologies has been applied on-site in 5 wells,with an excellent cementing quality rate of 94.06％for oil casing,providing technical reference for similar deep shale gas horizontal wells.关键词
川南地区/筇竹寺组/油层套管/防气窜韧性水泥浆/旋转下套管/驱油冲洗液Key words
Southern Sichuan region/Qiongzhusi Formation/oil reservoir casing/anti gas channeling tough cement slurry/rotating casing/oil displacement flushing fluid分类
能源科技引用本文复制引用
李涛,杨哲,周焱,徐志凯,刘宇航,谭宇龙,杨慎福..川南筇竹寺组超深层页岩气水平井油层套管固井关键技术[J].石油地质与工程,2026,40(1):109-114,6.基金项目
中国石油西南油气田分公司科技项目"钻井故障复杂智能预警系列技术—基于大数据分析的卡钻智能预警技术研究"(2024D102-01-07). （2024D102-01-07）
