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Research Progress on Solvent Gas Diffusion Coefficient of Vapor Extraction Technique
Zhao Fajun, Wen Zixiang, Kan Changxuan, He Lei, Shi Man, Sun Lanjia
Since R.M.Butler developed the vapor extraction of heavy oil and bitumen (VAPEX) technology,the VAPEX has been found many advantages such as low energy consumption and costeffective. In addition, the VAPEX can also avoid the production of greenhouse gases and upgrade the crude oil. In brief, the VAPEX has become a promising and practical technology. In order to evaluate the oil recovery rate in different steps and optimize the field operation condition, solvent gas diffusion of the VAPEX has been attracted more and more attentions. This paper analyzes molecular diffusion and dispersion of solvent gas in heavy oil and bitumen, provides an important mathematical relation, and achieves an mathematical model for improving yield of heavy oil and bitumen, providing theoretical support for exploration of VAPEX, and could also predict the processes of VAPEX in efficient way in the meantime.The prospective of VAPEX technology has been raised in this paper.
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