Drilling Completion Techniques Used in Shale Gas Horizontal Wells in Jiaoshiba Block of Fuling Area

In view of the problems of frequent downhole accidents in shale gas well drilling in Jiashiba Block of Fuling Area,slow penetration rate,long drilling cycle,and high cost caused due to complex geological conditions and strong anisotropy,the adaptability of drilling technologies used in Jiaoshiba Block was evaluated based on the analysis on the difficulties of shale gas well drilling.The technical drilling scheme for Jiaoshiba Block shale gas horizontal wells in Fuling Area was then proposed through evaluation,selection and optimization of cluster well placement,casing program,well trajectory,fast drilling techniques,drilling fluid,and cementing techniques for the long horizontal section.The technical scheme has been applied in 17 wells including Well Jiaoye1-2HF resulting in significant increase in penetration rate and drilling cycle reduction.The research provides sound technical support for shale gas’commercial development in Jiaoshiba Block of Fuling Area.