摘要
弥散是混溶驱替过程中一种重要的传质方式,在一定程度上决定着体积波及效率,然而很多混溶驱替模拟过程均未考虑弥散的影响。为此,根据随机建模方法来构建体中心网络模型,利用Kirchoff定律和有限差分方法对模型压力场和浓度场进行耦合求解,开展混溶驱的动态网络模拟,分析孔隙结构特征参数与流体流动参数对混溶驱的影响。结果表明:与不考虑弥散的混溶驱相比,考虑弥散的混溶驱体积波及效率更高,驱替流体突破时间更晚,前缘突破时的采出程度更高;对于考虑弥散的混溶驱,孔隙非均质性越强(或孔隙连通性越低或黏度比越大或驱替流量越大),黏性指进现象越明显,体积波及效率越低,前缘突破时间越早,采出程度越低;前缘突破时的采出程度与孔隙非均质性(或孔隙连通性)呈线性关系,与黏度比(或驱替流量)呈乘幂关系。该研究成果对于弄清溶质运移规律和提高驱替流体的体积波及效率具有重要意义。
Dispersion is an important mass transfer method in miscible displacement process,which determines volume sweep efficiency to a certain extent.However,dispersion is not considered in many miscible displacement processes.Therefore,the body center network model was built according to the stochastic modeling method.Kirchoff's law and finite difference method were used to solve the coupling of pressure field and concentration field of the model.The dynamic network simulation of miscible displacement was carried out,and the influences of pore structure characteristic parameters and fluid flow parameters on miscible displacement were analyzed.The results show that compared with miscible displacement without dispersion,miscible displacement with dispersion has larger volume sweep efficiency,later breakthrough time of displacement fluid and higher recovery degree corresponding to breakthrough. For the miscible displacement with dispersion,the stronger the heterogeneityof pores(or the lower the connectivity of pores,or the larger the viscosity ratio,or the larger the displacementflow),the more obvious the fingering phenomenon,the lower the volume sweep efficiency,the earlier thebreakthrough time of front,and the lower the recovery degree. At the same time,the recovery degree correspondingto the breakthrough is linearly related to the heterogeneity of pores(or the connectivity of pores),and is exponentiallyrelated to the viscosity ratio(or displacement velocity). The results are of great significance to clarifythe solute transport law and expand the volume sweep efficiency of displacement fluid.
作者
戚涛
胡勇
李骞
赵梓寒
张春
李滔
QI Tao;HU Yong;LI Qian;ZHAO Zihan;ZHANG Chun;LI Tao(Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu 610041,China;PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China)
出处
《岩性油气藏》
CSCD
北大核心
2020年第5期161-169,共9页
Lithologic Reservoirs
基金
“十三五”国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(编号:2016ZX05052-002)
中国石油天然气股份有限公司重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”(编号:2016E-0605)联合资助。
关键词
弥散
混溶驱
网络模拟
孔隙非均质性
孔隙连通性
黏度比
驱替流量
dispersion
miscible displacement
network simulation
pore heterogeneity
pore connectivity
viscosity ratio
displacing velocity
