渤海密集丛式热采井钻完井配套技术研究

Research on drilling and completion technology of dense cluster thermal recovery well in the Bohai Sea

中海石油渤海油田稠油储量丰富,探明地质储量占渤海油田总储量的56%。由于稠油黏度高、流动性差,导致其开发难度大,动用程度低。在利用350℃高强度蒸汽吞吐密集丛式热采井有效动用稠油储量的钻完井过程中面临着诸多问题,如平台/井口空间受限、小井距防碰风险高、低成本井身结构设计难、防砂有效期短、多轮次注采安全控制难等。通过攻关研究,初步形成了包括国产随钻陀螺仪主动轨迹调控、高造斜率过程井身剖面优化、工程地质一体化过断层安全钻进、蒸汽吞吐固井、全生命周期管材选型、注采一体化井口、防砂有效性综合评价及耐高温长效防砂管柱和关键工具研发等为一体的渤海密集丛式热采井钻、完井配套技术。研究成果有助于渤海稠油规模化效益开发。

CNOOC Bohai Oilfield boasts abundant heavy oil reserves,with proven geological reserves accounting for 56% of the total in the Bohai Oilfield.Due to the high viscosity and poor fluidity of heavy oil,its development is challenging and its utilization is low.Addressing the issues encountered during the drilling and completion of 350 ℃ high-intensity steam huff and puff dense cluster thermal production well,such as limited platform/ wellhead space,high collision risk due to small well spacing,difficulty in designing low-cost well structure,short sand control effectiveness period,and safety control in multi-round injection and production,etc.,through research,a series of supporting technologies for drilling and completion of dense cluster thermal recovery wells in the Bohai Sea have been initially developed.These includes domestic gyroscope-based active trajectory control,well profile optimization in the process of high build-up rate,engineering geology integrated safe drilling through faults,cementing,pipe selection,integrated injection and production wellhead,comprehensive evaluation of sand control effectiveness,and the development of high-temperature and long-term sand control pipe string and key tools.This ensures the large-scale and cost-effective development of heavy oil in Bohai Sea.