Molecular Simulation of Dissolution of Non-condensate Gas in Oil and Oil Pores
With the continuous exploitation of oil,the reserves of light crude oil are decreasing,and the crude oil with high molecular weight and viscosity has become the main object of exploitation.In this paper,different crude oil,such as C6 and mixed heavy oil,are constructed,and the molecular dynamics method is used to explore the microscopic process of dissolution of non-condensable gases(N2,CO2 and mixed gas)in crude oil pores.The dissolution mechanism of non-condensate gases in different crude oil and nanoscale pores is revealed,and the effect of temperature and pressure is explored.The results demonstrate that with the addition of macromolecular asphaltene and resin,the dissolution process of gas is inhibited,and the light components of heavy oil could be extracted by gas.The solubility of CO2 in crude oil and the peeling ability of crude oil on the wall are stronger than that of N2.And N2 forms a gas channel in the middle of the pore.In addition,increasing temperature and pressure can improve the effect of gas on crude oil swelling and crude oil propulsion in pores.
Non-condensate gaspore of crude oilmolecular dynamics simulationDissolution
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