摘要
CO_(2)驱替是一种提高低渗透油藏开发效率的方法,通过向低渗储层注入CO_(2),可以显著增加原油的采收率,具有重要的研究价值。采用长岩心驱替实验的方法,研究了在气藏中注入CO_(2)进行增产的不同因素对CO_(2)驱气效率的影响规律。结果显示:驱替速度对CO_(2)驱替效率有显著影响,速度越低,CO_(2)突破越早,CH_(4)最终采收率越低;岩心渗透率也对CO_(2)驱替效率有重要影响,渗透率越小,在注入相同孔隙体积的CO_(2)后,CO_(2)突破时间越短,CH_(4)最终采收率越低;重力分异效应导致高位注入低位采出时,CO_(2)突破更快,CH_(4)采收率更低;束缚水的存在能够延缓CO_(2)突破时间,提高CH4采收率。此举为低渗油藏注CO_(2)的高效开发过程提供了一定的理论基础和数据支持。
CO_(2) flooding is a method to improve the development efficiency of low-permeability reservoirs.By injecting CO_(2) into low-permeability reservoirs,the recovery of crude oil can be significantly increased,which has important research value.In this paper,the method of long core displacement experiments wasused to study the influence of different factors on CO_(2) displacement efficiency by injecting CO_(2) into gas reservoirs to increase production.The experimental results showed that displacement speed hada significant impact on CO_(2) displacement efficiency.The lower the CO_(2) breakthrough,the lower the ultimate recovery of CH_(4);the core permeability also hadan important impact on the CO_(2) displacement efficiency.The lower the core permeability was,the gravitational fractionation effect led to faster CO_(2) breakthrough and lower CH_(4) recovery rate when high-level injection and low-level recovery were caused by the gravity fractionation effect;the existence of irreducible water coulddelay the CO_(2) breakthrough time and improve the CH_(4) recovery rate.This paper canprovide a certain theoretical basis and data support for the efficient development process of CO_(2) injection in low-permeability reservoirs.
作者
刘亮
杨建莉
张雪萍
石亦萱
褚海莉
王浩栋
LIU Liang;YANG Jian-li;ZHANG Xue-ping;SHI Yi-xuan;CHU Hai-li;WANG Hao-dong(Yanchang Oilfield Co.,Ltd.Dingbian Oil Production Plant,Yulin Shaanxi 718600,China;Xi'an Shiyou University,Xi'an Shaanxi 710065,China)
出处
《当代化工》
CAS
2023年第8期1903-1906,共4页
Contemporary Chemical Industry
基金
国家自然科学基金面上项目,离子水驱砂岩油藏固/液体系界面调控及残余油启动机制研究(项目编号:52174027)
陕西省青年科技新星项目,特低渗油藏CO_(2)驱油抽提作用及组分变化研究(项目编号:2015KJXX-87)。
关键词
低渗油田
CO_(2)驱
提高采收率
驱气效率
Low permeability oil field
CO_(2) flooding
Enhanced oil recovery
Gas drive efficiency
