低渗透油藏渗吸采油机理及技术进展

Progress in Mechanism and Technology of Imbibition Recovery in Low Permeability Reservoirs

渗吸作用是国内绝大数低渗透油藏的主要采油机理。渗吸采油的效果受诸多因素的影响:储层特征、采油制度、表面活性剂的物理化学性质等,其作用机理也有待进一步的研究。本文首先回顾了渗吸作用的机理,包括毛细管渗吸的力学分析;接着介绍了有关渗吸实验方法的技术进展;并总结了影响渗吸作用的控制因素,包括岩心和流体的性质以及温度和压力的影响。着重介绍了渗吸剂属性对渗吸提高采收率的影响,对渗吸用表面活性剂的优化筛选起到一定的指导作用,指出了渗吸采油存在的问题和对未来研究方向的展望。

Imbibition is the main oil recovery mechanism in most low permeability reservoirs in China.The effect of imbibition oil recovery is affected by many factors,such as reservoir characteristics,oil production system,physical and chemical properties of surfactants,etc.Its mechanism of action also need to be further studied.In this paper,the mechanism of imbibition including the mechanical analysis of capillary imbibition was reviewed.The technical progress of imbibition test method was introduced.The controlling factors affecting imbibition,including rock and fluid properties,temperature and pressure,were summarized.The influence of properties of imbibition agent on enhanced oil recovery by imbibition was emphatically introduced,which played a guiding role in optimizing the selection of surfactant used for imbibition,and the existing problems in oil recovery by imbibition and the prospect of future research direction was put forward.