Physical modeling of the composite solvent injection to improve the ultra-viscous oil recovery efficiency steam-assisted gravity drainage

The experiments carried out on a physical model of reservoir of ultra-viscous oil have revealed features of oil displacement in various variants of the composite solvent and steam injection. In order to avoid precipitation of asphaltenes, the employment of inhibitors has been rationalized and their minimum fraction in displacement fluid has been determined. The effect of the sequence of solvent and vapor injection on the dynamics of ultra-viscous oil recovery has been investigated. The effect of clay and water in the rock on the rate of oil displacement and the ultimate oil recovery factor has been evaluated.