应对成熟油田可持续开发的地质导向革新策略

Innovative Geosteering Strategies for the Sustainable Development of Mature Oilfields

基于南海东部番禺油田水平井地质导向工作的整体目标,针对地下构造、地层和流体特征的不确定性,提出了基于革新性边界探测技术和井眼成像技术的地质导向策略,可高效控制轨迹平稳着陆,并在储层内精确调整水平轨迹尽量贴顶钻进(距顶0~1 m)。不同类型油藏中的成功应用实例表明,该地质导向革新策略可提高钻井效率、节省预算,而且对于产能优化的贡献明显,油井日产量2 000~6 000桶,含水极低,油田累计产量超过预期17%。通过规避"阁楼"油和延缓油井见水时间,有效优化了油田采收率。此外,钻后地质油藏模型的更新可为后续井位部署和开发策略的优化提供有效指导。

Based on the overall goals of geosteering in horizontal wells,we have proposed an innovative strategy for geosteeringbased on boundary detection and borehole imaging techniques,to resolve uncertainties in subsurface structure,and stratum andfluid characteristics.This strategy allows highly-effective control of the bore to produce smooth bore trajectories,and accuratesteering of the bore within a stratum to allow horizontally-drilled bore trajectories to proceed as closely as possible to theceiling of a reservoir(within0–1m of the ceiling).Successful implementations of this strategy in various types of oil reservoirshave shown that this innovative geosteering strategy can improve well-drilling effectiveness,decrease costs,and contributesignificantly towards the production optimization;with this strategy,2000–6000barrels were produced a day from an oil well,with extremely low levels of water content,and the cumulative production of the oil field has exceeded initial estimates by17%.Hence,we have effectively optimized the recovery rate of oil fields by avoiding“attic”oil and postponing the use ofwaterflooding in a well.Furthermore,the updating of post-drilling geological oil reserve models may provide an effective formof guidance for the optimization of well deployment and development strategies in the future.