渤海埕北油田大斜度井取心实践与认识

Coring practice and knowledge in high deviated well of Chengbei Oilfield in Bohai Sea

王智锋 李作会 王敏生

Wang Zhifeng Li Zuohui Wang Minsheng

中国石化集团 胜利石油管理局 钻井工艺研究院, 山东 东营 257017

Shengli Drilling Technology Research Institute, SINOPEC, Dongying 257017, China

为了解馆陶组原油产量,解决东营组产量递减引起的油田产能下降的问题,中海油在埕北油田布置了-口重点调整井——CB-A29m大斜度井。由于地层疏松,该井井斜角较大等造成取心难度大。针对取心难点,对取心筒、取心钻头、取心衬筒等取心工具进行了改进,并优化了疏松地层取心工艺技术措施,最终获得成功取心。CB-A29m大斜度井取心实践与认识为开发后期海上油田设计大位移评价井取心提供了新方法,对大位移井、大斜度井疏松地层取心作业具有借鉴意义。

In order to find out crude oil production in Guantao Formation and to solve the problem of production capacity decrease due to production in Dongying Formation, CB-A29m well, akey adjustment well, was planned by CNOOC in Chengbei Oilfield. Formations were unconsolidated and hole deviation angle was high, so it was difficult to recover cores from this well. In view of the difficulties in coring operation, the coring system including the core barrel, optimized, and the coring job was successfully finished. Coring practice and knowledge on CB-A29m well have provided new methods for coring design of offshore extended reach appraisal wells during the late development period, and are of great help to coring operation in unconsolidated formations in extended reach high deviated wells.