来源：期刊VIP网 时间：
作者：YANG Daoyong;LI Yunlong ;HUANG Desheng;
单位：Energy Systems Engineering, Faculty of Engineering and Applied Science, University of Regina;
摘要：The hybrid steam-solvent injection has been considered as a promising technique for enhancing heavy oil/bitumen recov‐ery,while its main mechanisms including the heat transferred and dissolution of solvents (e.g.,CH_4,C_2H_6,C_3H_8,C_4H_(10),CO_2,N_2,and DME) into heavy oil/bitumen to reduce its viscosity and swell it are closely related to the phase behaviour of the solvents/water/heavy oil systems.To allow the seamless integration with the existing reservoir simulators,the traditional cubic equations of state (i.e.,SRK EOS and PR EOS) have been modified and improved to accurately quantify the phase behaviour and physical prop‐erties of the aforementioned systems under equilibrium and nonequilibrium conditions.Firstly,a huge database has been built to de‐velop the corresponding alpha functions by minimizing the deviation between the measured and calculated vapour pressures for wa‐ter as well as non-hydrocarbon and hydrocarbon compounds available from the public domain.Such obtained alpha functions are fur‐ther validated with enthalpy of vaporization for pure substances,and then the reduced temperature has been optimized and the ec‐centric factor has been redefined.Finally,a pressure-implicit strategy has been developed to optimize the binary interaction param‐eters (BIPs) by treating heavy oil as one pseudocomponent (PC) or multiple PCs.Also,the contributions of each solvent to the aforementioned systems have been compared and analyzed within a consistent and unified framework.In addition to new alpha func‐tions for hydrocarbons and water,respectively,the reduced temperature is found to have its optimum value of 0.59 for the two equa‐tions of state (EOSs),while 0.60 is recommended for practical use.Such improved EOSs have been further employed to reproduce the experimentally measured multiphase boundaries (or pseudo-bubble-point pressures),density,viscosity,(mutual) solubility,and preferential mass transfer for the aforementioned mixtures under equilibrium and nonequilibrium conditions.The swelling effect for the heavy oil can be enhanced due to the addition of C_3H_8 and/or C_4H_(10) or their mixtures into the CO_2 stream.Due to the exis‐tence of water,isenthalpic flash leads to more accurate quantification of multiphase boundaries and physical properties for the hy‐brid solvent-thermal processes.Each component of a binary or ternary gas mixture is found to diffuse preferentially into heavy oil at high pressures and elevated temperatures in the absence and presence of porous media,while each of them is found to exsolve dif‐ferently from gas-saturated heavy oil under nonequilibrium conditions.
基金资助：financial support from EHR Enhanced Hydrocarbon Recovery Inc. and Thermal Recovery Technologies Inc
