Determination of Diffusion Coefficient and Percolation Model During CO2 Flooding
During the process of CO2 flooding, different hydrocarbon components of crude oil, water phase and CO2 with formation oil-water system form a multiphase and multicomponent system, and the state of CO2 is determined by the temperature and pressure. In addition, the intermolecular diffusion happen between injected CO2 and the formation fluids, there are also miscible and immiscible areas in different pressure conditions. In this paper, laboratory method is applied to measure the diffusion coefficients of CO2 in the porous medium under high pressure and temperature. It is found that the diffusion coefficients grow as the pressure increases;the diffusion effect of CO2 can not be ignored in the flow process. From the laws of phase equilibrium and material balance, using Darcy’s linear flow law, meanwhile considering the CO2 diffusion effect, the sectional percolation mathematical model of multi-phase and multi-component, CO2 immiscible and miscible flooding considered, can be derived. The findings nrovide basic narameters and theoretical basis for numerical simulations.
CO2 flooding diffusion coefficient miscible multi-phase and multi-component percolation mathematical model
ZHAO Fenglan HUANG Shijun HOU Jirui
EOR Center, China University of Petroleum, Beijing, P.R.China, 102249 MOE Key Laboratory of Petroleu EOR Center, China University of Petroleum, Beijing, P.R.China, 102249
国际会议
成都
英文
106-112
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）