致密油藏CO_(2)驱和水驱分子动力学模拟及微观机理  

Study of Microscopic Mechanism of CO_(2)/Water Flooding in Tight Oil Reservoir Based on Molecular Dynamics Simulation

作　　者：黄鑫淼 林伟 韩登林[1] 雷征东[4] 赵新礼 HUANG Xinmiao;LIN Wei;HAN Dengin;LEI Zhengdong;ZHAO Xini(School of Geosciences,Yangtze University,Wuhan,Hubei 430100,China;Research Institute of Digital Geology and Energy,Linyi University,Linyi,Shandong 276000,China;School of Resources and Environment(College of Carbon Neutrality),Linyi University,Linyi,Shandong 276000,China;Research Center of Enhanced Oil Recovery,PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;College of Petroleum Engineering,Changzhou University,Changzhou,Jiangsu 213164,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]临沂大学数字地质与能源研究院,山东临沂276000 [3]临沂大学资源环境学院(碳中和学院),山东临沂276000 [4]中国石油勘探开发研究院提高采收率研究中心,北京100083 [5]常州大学石油工程学院,江苏常州213164

出　　处：《西安石油大学学报（自然科学版）》2024年第3期72-81,共10页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金面上项目“陆相页岩油注二氧化碳吞吐提高采收率机理研究”(51974356);湖北省自然科学基金青年面上项目“盐间页岩油储层多尺度孔隙结构表征”(2021CFB182);中国石油科技创新基金项目“页岩油储层多尺度储集空间结构特征和纳米受限流体的数值模拟研究”(2022DQ02-0102)。

摘　　要：为了厘清CO_(2)驱和水驱两种驱替介质的微观驱油机理,基于分子动力学模拟方法,分别建立CO_(2)驱油模型和水驱油模型,研究不同驱替条件下亲水纳米孔隙内原油密度随驱替时间的变化规律,分析了驱油过程中烃类分子在纳米孔隙内的运移过程。研究结果表明:两种不同注入介质的驱油效率都随着注入速度的增大而增大;在CO_(2)驱油过程中,当注入速度较小时,CO_(2)膨胀发挥主要作用,随着注入速度增大,驱替逐渐发挥主导作用;在亲水纳米孔隙中,当注入水的速度较低时,渗吸发挥主要作用,此时小孔隙中的原油驱替速度比大孔隙快,随着注入速度增大,驱替逐渐发挥主导作用,大孔隙中的原油被快速驱替。In order to clarify the micro oil displacement mechanisms of CO_(2)flooding and water flooding,the CO_(2)and water oil displacement models are established respectively using molecular dynamics simulation method.The variation laws of density of crude oil in hydrophilic nanopores with displacement time under different displacement conditions were studied,and the migration process of hydrocarbon molecules in nanopores during oil displacement was analyzed.The research results indicate that as the injection rate increases,the oil displacement efficiency of both oil displacement media increases.During CO_(2)flooding,when the injection rate is low,the expansion of CO_(2)plays a major role;As the injection rate increases,displacement gradually plays a dominant role.In the process of water flooding,when the injection rate is low,imbibition plays a major role in hydrophilic nanopores.At this time,the displacement rate of crude oil in small pores is faster than that in large pores;As the injection rate increases,displacement gradually plays a dominant role,and the crude oil in the large pores is rapidly displaced.

关 键 词：CO_(2)驱油 水驱油 分子动力学 致密油藏 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]