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.
出处
《科学技术与工程》
北大核心
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
关键词
低渗透油藏
CO2驱油
储层物性
改造作用
实验方法
low permeability formation C02 flooding physical property of rock modification ex- perimental methods
作者简介
李隆新（1984-），男，四川成都人，西南石油大学油气藏地质及开发工程国家重点实验室在读博士，研究方向：油气田开发
通信作者简介：张烈辉（1967-），男，四川仁寿人，博士，西南石油大学油气藏地质及开发工程国家重点实验室教授，博士生导师，研究方向：油气田开发。
