Determination of the minimum miscibility pressures of CO2 and multicomponent oil system with a novel diffusion coefficient fit line intersection methodology
关键字：VANISHING INTERFACIAL-TENSION; SLIM TUBE; SUPERCRITICAL CO2; ANALYTICAL-MODEL; INJECTION; RESERVOIR; SOLVENTS; MMP; TEMPERATURE; SIMULATION
摘要：The minimum miscibility pressure (MMP) of the CO2/oil system is a key parameter for guiding CO2 enhanced oil recovery and CCUS practices. Based on the principle that the mass transfer behavior between the two phases could reveal the thermodynamic status, the diffusion coefficient is taken as the substantial indicator of the miscibility condition of the CO2/oil system. In this study, a novel methodology based on diffusion coefficient fit line intersection (DCFLI) is proposed to determine the MMP of a CO2/paraffin oil system depending on the significant change in the diffusion coefficient under immiscible and miscible conditions. The diffusion coefficients are measured via the dynamic pendant drop volume analysis (DPDVA) method, and the MMP is determined as the pressure point where the diffusion coefficient fit lines in typical immiscible and typical miscible conditions intersect. The proposed methodology is demonstrated for predicting the MMP of CO2 and paraffin oil at 40.1, 50.2, 60.4, 70.3, and 80.5 degrees C, and the measured MMP values are compared with the simulation results obtained via the multiple mixing-cell method. The measurement results agree well with the calculation results with an average absolute deviation (AAD) of 5.3 %, which validates the accuracy and reliability of the DCFLI methodology for the prediction of the MMPs of the CO2/paraffin oil system.
卷号：385
期号：-
是否译文：否
