涪陵气田立体开发地质工程一体化实践

Practice of geology and engineering integration in the stereoscopic development of Fuling Gas Field

针对涪陵页岩气田一次井网开发后剩余气储量动用不充分的问题,立体开发地质工程一体化技术是提高气藏采收率,实现对剩余储量精准动用的核心手段。通过建立页岩气地质工程一体化高效开发新模式,创新形成页岩气建模数模一体化技术进行剩余气精细研究,明确页岩剩余气分布情况;通过地质工程双甜点耦合,明确穿行黄金靶窗,建立“资源+应力+天然裂缝”三位一体分层效益组合体划分标准体系;基于剩余气差异化分布形态,建立“地质—钻井—压裂—地面协同优化”钻井与压裂优化设计流程;通过实时监测进行钻井轨迹与压裂施工的动态调整,建立一体化数据共享平台及实时决策系统。立体开发地质工程一体化技术指导焦石坝区块预期采收率从12.6%提高到23.3%,立体开发区采收率达39.2%。该技术的应用使页岩气钻采投资、10×10^(8)m^(3)产能建设投资及开发成本逐年缩减,有效指导了涪陵页岩气田提高采收率与高效开发。

In view of the insufficient utilization of residual gas reserves by primary well pattern development in Fuling Shale Gas Field,geology and engineering integrated stereoscopic development technology is the core means to improve gas recovery and achieve accurate utilization of residual gas reserves.As a result,a new high-efficiency shale gas development mode with geology and engineering integration has been established,and shale gas modeling and simulation integrated technology has been innovatively developed to conduct fine research and identify the distribution of residual shale gas;The coupling of geological and engineering double sweet spots enables to determine the gold target window of well drilling trajectory,and the classification standard system of“resource+stress+natural fracture”three-in-one layered benefit combination has been established;Based on the differential distribution pattern of residual gas,the drilling and fracturing optimization design process has been established with“geology-drilling-fracturing-surface collaborative optimization”;By using real-time monitoring,the dynamic adjustment of well drilling trajectory and fracturing construction has been conducted,and integrated data sharing platform and real-time decision system have been constructed.The geology and engineering integrated stereoscopic development technology has guided the development of Jiaoshiba block and increased estimated recovery rate from 12.6%to 23.3%,and up to 39.2%in the stereoscopic development zone.The application of this technology supports to reduce shale gas drilling and production investment,and billion square meter production capacity construction investment and development costs year by year,which effectively guides the recovery enhancement and high-efficiency development of Fuling Shale Gas Field.