天然气勘探与开发2025，Vol.48Issue(3)：105-112,8.DOI:10.12055/gaskk.issn.1673-3177.2025.03.011
四川盆地深层页岩气钻井复杂情况处置技术
Techniques for handling drilling complexities in deep shale gas reservoirs of Sichuan Basin:A case study of the Weidong 204 wellblock
摘要
Abstract
In order to efficiently develop the deep shale gas resources in the Sichuan Basin and solve the engineering complexities such as lost circulation,pipe sticking,and wellbore collapse caused by complex geological conditions during drilling process,two wells,A and B,in the Weidong 204 wellblock are taken as research objects.The factors that may induce drilling complexities are analyzed,including the developed formation fractures,weak formation support,and abnormal formation pressure coefficients.Some techniques are adopted:the key parts of tools that are prone to fatigue and damage are inspected and the bottomhole assembly(BHA)is optimized to avoid tool damage;for the issue of fish disposal,it is recommended to maintain a certain distance to flush the sand on the fish head and closely observe changes in suspending weight,pump pressure,and torque parameters;drilling fluid performance is optimized and water loss is controlled to prevent the formation of false mud cakes;in case of lost circulation,the drilling tool should be promptly lifted and the vibrating screen and liquid level be observed closely to quickly take control measures.The research results indicate that,(i)inspection of key parts and correct use of tools can effectively avoid damage and greatly improve durability and safety;(ii)flushing and parameter observation during fish disposal are helpful for timely response to and rapid handling of downhole complexities;(iii)optimization of drilling fluid performance is crucial for maintaining wellbore stability and providing a guarantee for safe drilling;and(iv)in case of lost circulation,timely lifting of drilling tool and strictly monitoring of vibrating screen and liquid level provide strong support for quickly taking control measures and avoiding well control risks.It is concluded that the handling techniques adopted for the two wells provide effective technical means and preventive measures against downhole complexities during subsequent fast shale gas well drilling in the study area,thus facilitating efficient development of deep shale gas resources in the Sichuan Basin.关键词
四川盆地/深层页岩气/威东204井区/压力系数/工程复杂/井漏/卡钻/快速钻井Key words
Sichuan Basin/Deep shale gas/Weidong 204 wellblock/Pressure coefficient/Engineering complexity/Lost circulation/Pipe sticking/Fast drilling引用本文复制引用
宋东东,尹珩,陈杨,郑儒民,黄淼羚,严军..四川盆地深层页岩气钻井复杂情况处置技术[J].天然气勘探与开发,2025,48(3):105-112,8.基金项目
中国石油天然气集团公司重大应用攻关型专项(编号:2023ZZ20)、中国石油集团川庆钻探工程有限公司项目(CQ2024B-12-10-3-F). （编号:2023ZZ20）
