More Realistic Four-Phase Stability and Phase Splitting Calculations for Canadian Heavy Oil and Bitumen Reservoirs Using Solvent Injection Processes

Seyed Ali Feizabadi
Supervisors: Jalal Abedi, Zhangxin Chen
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Abstract

Due to some of the limitations for thermal processes such as heat loss and environmental deficiencies, and in order to improve these thermal-based processes, the implementation of solvents in the exploitation of heavy oil reservoirs is attracting more and more attention.

Formation of a second liquid phase (Solvent-Rich Phase) in such a process, within a certain range of pressures and temperatures, has been acknowledged in the literature. Available commercial simulators such as STARS (CMG) can handle only two hydrocarbon phases in equilibrium, oil and gas. Thus, a compositional model with three hydrocarbon phases in equilibrium is necessary. In this modeling, the bitumen-rich phase L1 and the solvent-rich phase L2 are used. A four-phase flash calculation which can handle three hydrocarbon phases in equilibrium are developed, and evaluated using available numerical/experimental data and a commercial simulator. The results of the equilibrium constant calculation using the Mehrotra-Svrcek empirical correlation is a good substitution for complicated equation of state calculations.