低渗透油藏渗吸采油技术进展与展望

Development and Prospect of the Imbibition Oil Recovery Technology in Low Permeability Reservoirs

低渗透油藏存在着非均质性严重、注采困难、注入压力过高等问题,很难实现高效开发利用。与常规注水注气驱替开发方式不同,渗吸采油技术利用地层流体的密度差和储层毛细管的油水置换能力,逐渐成了低渗透油藏提高采收率重要手段之一。从低渗透油藏特征、渗吸作用机理及其影响因素、渗吸体系发展现状、渗吸采油与储层改造联合技术效果等4个方面,对渗吸采油技术的研究进展进行总结,并指出了存在的问题和后续研究方向。

Low permeability reservoir has the problems of serious heterogeneity, difficult injection-production and high injection pressure, which makes it difficult to realize efficient development and utilization. Being different from the conventional water injection and gas displacement development, the imbibition oil recovery technology makes use of the density difference of the formation fluid and the displacement capacity of the capillary of the reservoir, which has become one of the important means to improve the oil recovery in low permeability reservoirs. In this paper, the research progress of imbibition oil recovery technology was reviewed from four aspects of reservoir characteristics of low permeability reservoirs, mechanism of imbibition, research status of imbibition agents, and influence of fracture system, and the related problems and future research directions of the technology were pointed out.