Abstract In this study, the mechanism of CO2 extracting hydrocarbon with reservoir depressurization was investigated through molecular dynamic simulations. First, the effects of different depressurization rates (ΔP/0.1, 0.5, 1.0 and… Click to show full abstract
Abstract In this study, the mechanism of CO2 extracting hydrocarbon with reservoir depressurization was investigated through molecular dynamic simulations. First, the effects of different depressurization rates (ΔP/0.1, 0.5, 1.0 and 2.0 ns) on the extraction results were explored to ascertain the most efficient rate. Subsequently, the depressurizing rate with ΔP/1.0 ns was taken to characterize the extraction process, and then the association between the energy release of the system and the phase separation was verified to be vital to improve tight oil recovery. Next, an Arrhenius relationship between the number of extracted C10 and temperature before and after depressurization was found, and the activation energies were exploited to predict the production, suggesting that the effect of temperature on the extraction results is more significant when the system is in a non-equilibrium state. This simulation study provides microscopic insights into the implication of depressurization.
               
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