高含水油藏“二三结合”关键技术研究进展

中国陆上老油田大多数已经进入高含水期,面临迫近经济极限产量的危机,亟需转变传统开发模式。在汲取二次开发“重构地下认识体系,重建井网结构,重组地面工艺流程”,即三大重构的成功开发理念与经验的基础上,“二三结合”开发理念应运而生。“二三结合”是指将二次开发精细水驱采油与三次采油层系井网协同优化部署,立足当前水驱方式精细挖潜,适时转入三次采油,追求精细水驱与三次采油衔接最优化、各类油层转换有序化,实现总体采收率最大化和经济效益的最优化。以“二三结合”开发理念作指导,条件各异类型多样的不同油藏,具有相对应的开发模式,既有针对性也有普遍性。“二三结合”技术主要在于油藏适应性评价,立体井网层系重构,以及转化时机技术的研究。高含水油藏“二三结合”关键技术,为油田实现经济有效开发提供有力技术支撑。

Research Progress on Key Technologies of Secondary-Tertiary Combination in High Water Cut Reservoir

Most of the onshore brown oilfields in China have entered a period of high water cut, facing a crisis near the economic limit production, and need to change the traditional development model. Based on the successful redevelopment concept and drawing on experience of the three reconstructions of "reconstructing the underground understanding system, rebuilding the well pattern, reorganizing the ground process flow", the concept of "Secondary-Tertiary Combination" development came into being. "Secondary-Tertiary Combination" refers to the secondary development of fine waterflooding and tertiary oil recovery to optimize the deployment of well pattern and strata series, based on the current water flooding to tap the potential, timely transfer into the tertiary oil recovery, the pursuit of fine water drive and tertiary oil recovery optimization and all kinds of oil layer arranged conversion to maximize the overall oil recovery and economic benefits. With the guidance of "Secondary-Tertiary Combination" development concept, different types of reservoirs different conditions yield the corresponding development model, both targeted and universal. The main keys of "Secondary-Tertiary Combination" are the evaluation of reservoir adaptability, the reconstruction of well pattern and strata series, and the optimization of transfer timing technology. The key technologies of "Secondary-Tertiary Combination" technologies provide strong technical support for brown oilfields to achieve economic and effective development.