Molecular simulation of the effect of crude oil component polarity on the wettability of the sandstone oil reservoirs
In order to investigate the influence of the polarity of the crude oil components on the surface wettability of minerals in sandstone reservoirs.From a microscopic molecular perspective,α-quartz crystal surface model is constructed,and different polarity crude oil components and water molecules are selected to form a three-phase model that conforms to the real oil reservoir.The effects of crude oil components on the wettability of sandstone reservoirs are studied by molecular dynamics simulation method through relative concentration distribution function and surface energy.The results show that in the process of accumulation,the crude oil component with stronger polarity has a peak relative concentration distribution close to the quartz surface,the adsorption energy with the quartz surface is also greater,and the ability to pass through the water film and adsorb on the mineral surface is stronger,which can be the formation of oil film on the oil surface to realize wetting reversal.This law has guiding significance for sandstone reservoirs development.
NETL
NSTL
万方数据
