CO2在饱和稠油岩心中的扩散及仿真模拟  

Research on the diffusion of CO2 in porous media saturated by heavy oil and simulation for its diffusion process

作　　者：杜林 王仕莉[2] 袁京素 马剑坤 孙来喜[1] DU Lin;WANG Shili;YUAN Jingsu;MA Jiankun;SUN Laixi(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Exploration and Development Research Institute,Xinjiang Oilfield Company of China Petroleum,Karamay 834000,China;No.8 Oil Production Plant of Changqing Oilfield Company,PetroChina,Xi an 710018,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [3]中国石油长庆油田分公司第八采油厂,西安710018

出　　处：《成都理工大学学报（自然科学版）》2019年第6期697-703,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05023-001)

摘　　要：探讨CO2在稠油油藏中的扩散传质规律及影响因素。通过分析CO2在饱和稠油岩心中的扩散过程,建立了物理模型及数学模型;并将其与CO2状态方程进行耦合,建立了求解扩散系数的压降模型,利用该模型拟合实验数据,求得扩散系数;利用该结果及实验条件,进行扩散过程的仿真模拟。结果表明,CO2在饱和稠油岩心中扩散系数的数量级为10-10,契合已有研究结果;此外,孔隙直径、稠油与CO2的接触面积等因素影响CO2在饱和稠油岩心中的扩散特征。利用压降模型拟合实验数据的方法可有效求取CO2在饱和稠油岩心中的扩散系数,且仿真模拟可实现扩散过程的可视化及因素分析。The mass transfer of CO2 in heavy oil reservoirs plays an important role in CO2 injection enhanced oil recovery(EOR)and this paper mainly deals with the influence factors and regularity of mass transfer of CO2 in heavy oil reservoirs.On the basis of analysis of diffusion process of CO2 in heavy oil cores,a physical and mathematical model is established and coupled with the CO2 equation of state so as to set up the pressure drop model for solving diffusion coefficient.The established model is used to fit the experimental data and obtain the diffusion coefficient;and the obtained result and experimental conditions are applied to the analogue simulation of diffusion process.It shows that the magnitude of diffusion coefficient of CO2 in porous media saturated by heavy oil is 10-10,which matches with the results of previous study.Also,the size of pores and contact area between CO2 and heavy oil play a role in affecting the diffusion characteristics of CO2 in porous media saturated by heavy oil.It proves that the method of fitting experimental data with pressure decay model can effectively calculate the diffusion coefficient of CO2 in porous media saturated by heavy oil and the analogue simulation can achieve the purposes of visualization of diffusion process and factor analysis.

关 键 词：CO2 稠油 多孔介质 扩散系数 仿真模拟 

分 类 号：TE345[石油与天然气工程—油气田开发工程]