涪陵焦石坝区块页岩气水平井钻井完井技术

针对涪陵焦石坝区块地质条件复杂、各向异性大,易导致发生井下故障、钻速慢、钻井周期长及成本居高不下的问题,在分析该区块页岩气钻井完井技术难点的基础上,进行了页岩气水平井钻井工程技术适应性评价,通过对丛式井布井方案、井身结构、井眼轨道设计、优快钻井技术、钻井液技术及页岩气层长水平段固井技术等进行优选及进一步优化,提出了涪陵焦石坝区块页岩气水平井钻井完井技术方案。该技术方案在焦页 1-2HF 井等17口井进行了现场实践及应用,初步形成了涪陵焦石坝区块页岩气水平井钻井完井技术。应用表明,该技术可显著提高机械钻速、缩短钻井周期,可为涪陵焦石坝区块页岩气规模开发提供技术支持。 

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.