摘要
多组分化学复合驱过程中色谱分离现象普遍存在,导致化学剂在地层运移过程中的质量浓度比例与实验室优化的质量浓度比例存在差异,影响最佳的驱油效果。采用格子玻尔兹曼方法,考虑多组分化学剂在多孔介质中渗流的路径运移差异、扩散运移差异、竞争吸附等机制特征,建立孔隙尺度的化学驱模拟方法,研究化学驱中的色谱分离问题。基于二维多孔介质刻蚀模型,以两种表面活性剂为例,定义无因次突破时间、无因次质量浓度分布区间、无因次质量浓度峰值和无因次质量浓度峰值时刻4个指标对色谱分离规律和机制进行研究。结果表明:扩散运移差异是色谱分离现象的主要成因,扩散系数和注入速度是无因次突破时间差异的主控因素,最大吸附量和扩散系数是化学剂质量浓度峰值差异的主控因素。
Chromatographic separation is prevalent in the process of chemical flooding using multi-component of chemicals, which can result in a significant difference between the mass concentration ratio of the chemical agents appeared in the reservoir with that optimized in the laboratory, and affect the efficiency of oil displacement. In this study, a Lattice Boltzmann method was applied to establish a numerical simulation model of chromatography separation during chemical flooding, in which the migration paths, the diffusive transport difference and the competitive adsorption of the chemicals agents in porous media were considered. A porous medium model was established based on the two-dimensional image of an etching model. Taking two kinds of surfactants for a case study, four dimensionless indicators were defined, including breakthrough time, mass concentration distribution interval, mass concentration peak and mass concentration peak time, in order to reveal the effects and mechanisms of the chromatographic separation. The simulation results show that the diffusive transport difference is the main cause of the chromatographic separation phenomenon. The diffusion coefficient of the chemicals and their injection rates are the main controlling factors of their breakthrough time. The maximum adsorption capacity and diffusion coefficient are the main controlling factors of the peak value difference of the chemical agents.
作者
杨圣贤
郭振海
张广福
王惠宇
杜庆军
YANG Shengxian;GUO Zhenhai;ZHANG Guangfu;WANG Huiyu;DU Qingjun(Shengli Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying 257051,China;School of Petroleum Engineering in China University of Petroleum (East China),Qingdao 266580,China;Key Laboratory of Unconventional Oil & Gas Development,Ministry of Education,Qingdao 266580,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第4期119-126,共8页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家科技重大专项(2016ZX05011003-008)
关键词
色谱分离
格子玻尔兹曼方法
化学驱
竞争吸附
扩散
chromatographic separation
Lattice Boltzmann method
chemical flooding
competitive adsorption
diffusion
