低渗透油藏CO_2混相驱对储层改造作用的实验研究  

Experimental Research on Formation Modification of CO_2 Miscible Flooding in Low Permeability Reservoir

作　　者：李隆新[1] 吴锋[1] 张烈辉[1] 

机构地区：[1]西南石油大学油气藏地质与开发国家重点实验室,成都610500

出　　处：《科学技术与工程》2013年第13期3588-3591,3608,共5页Science Technology and Engineering

基　　金：国家973项目(2006CB705808)资助

摘　　要：研究注入CO2对低渗透储层的改造作用,对于理解CO2驱混相体系的渗流特征以及完善混相驱数值模拟方法都具有重要的意义。以取自吉林大情字井油田的天然岩心为研究对象,开展混相条件下的CO2驱替实验,分析驱替实验前后岩心成分和物性参数的变化。研究结果表明,CO2注入低渗透储层后会引起储层孔渗的改变,改变主要来自于长石和碳酸盐胶结物的溶解和微粒的运移,且多发生在能量汇集较高的喉道内壁处。这些改变将最终影响气体突破的时间和CO2驱的驱替效率,是发展CO2驱数值模拟模型应当考虑的因素。Studying the effects of C02 injection on formation of low permeability reservoir is essential to the un- derstanding of the seepage characteristics of miscible system and modification of C02 miscible flooding model. Based on natural cores from Daqingzi 0ilfield, displacement tests were conducted under miscible condition and analysis of the core components and physical parameters changes were performed. The results show that the injec- tion of C02 induces changes of physical properties in low permeability formation. These changes were mainly caused by the dissolution and the particles migration of feldspar and carbonate cement where higher energy is collected. The changes of reservoir physical properties can affect the breakthrough and recovery and must be taken into ac- count in the development of C02 flooding numerical simulation model.

关 键 词：低渗透油藏 CO2驱油 储层物性 改造作用 实验方法 

分 类 号：TE357.49[石油与天然气工程—油气田开发工程]