Phase Behavior Analysis of Multicomponent Diluent and Bitumen Mixtures: Applications in In-Situ Extraction and Pipeline Transportation

Abstract

This research investigates the phase behavior of multicomponent diluent and bitumen mixtures, providing experimental data essential for bitumen recovery and pipeline transportation. Using a custom-made experimental setup, including a high-pressure and high-temperature rocking PVT cell, densitometer, viscometer, and data acquisition system, the study analyzes homogenous mixtures and liquid-liquid equilibrium (LLE). Thermophysical properties, such as viscosity and density, are measured. The results reveal that a critical volume fraction of 0.7 of the multicomponent solvent studied leads to a phase transition from homogeneity (single-phase liquid) to two distinct liquid phases. Liquid-liquid equilibrium analysis at different solvent concentrations and temperatures demonstrates the significant impact of diluent on bitumen properties. This study addresses a gap in existing experimental data, offering crucial insights into solvent-aided bitumen recovery and pipeline transportation. It contributes to fostering more efficient and sustainable practices in the oil and bitumen industries.