砂岩油藏高倍数水驱物性及驱替特征变化规律研究进展

Research progress of high multiple water displacement properties and displacement characteristics in sandstone reservoirs

采用注水开发的砂岩油藏一般在进入到高含水阶段后,务必会经过长期的注水开发,水驱倍数一般较高,高倍水驱后储层的驱替特征会发生显著变化,从而会影响油田的驱油效率和最终的采收率。针对储层孔隙结构、渗透率、孔隙度、矿物组成、润湿性等参数,总结了各种参数的研究方法和技术手段,归纳了高倍水驱后储层微观孔隙参数和宏观参数的变化规律,阐述了研究过程中可能存在的问题,为后续的储层时变研究提供技术指导。

The sandstone reservoirs developed by waterflooding generally require long-term develop-ment after reaching the high water cut stage,resulting in a higher water drive ratio.The displacement characteristics of the reservoir will significantly change after high water drive,impacting the oil displace-ment efficiency and final recovery efficiency of the oilfield.This paper summarizes research methods and technical means for various parameters such as reservoir pore structure,permeability,porosity,mineral composition,and wettability.It also discusses the changes in micro-pore parameters and macro-parame-ters of the reservoir after high-power water flooding,as well as potential issues in the research process to provide technical guidance for subsequent time-varying reservoir studies.