A semi-analytical model for VAPEX with a two-component injection gas
« Bureau d’Etudes Industrielles »
Directed by Arjan KAMP
Abstract : Heavy oil and bitumen represent a huge natural resource and they are characterized by their high viscosity. Consequently, they are extractable with difficulty so a recovery mechanism is required by which the viscosity of the substance is lowered. The vapour extraction (VAPEX) process is an emerging technology that has recently gained considerable attention for its promising application for the recovery of heavy oils. A mixture of vaporized solvent and a commercially non-condensable gas is injected into the reservoir to reduce the viscosity. The costs of these gases per barrel of produced oil is critical for the economic viability of the process. To reduce the solvent cost, an injection of carbon dioxide (CO2 ) as a non condensable gas appears to be an attractive alternative. Analytical and experimental model has been developed by scientists in order to simulate the methane/propane mixture injection. This model can be improved and adapted to simulate CO2 / propane injection. The main objective of this work is to develop a mathematical model of the VAPEX process in the case of an injection of CO2 as a co-solvent. This mixture can provide greater reduction in oil viscosity compared to the equivalent mixture of methane/propane.