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Derived from the results of experimental modeling of physicochemical processes of solvent extraction of extra-viscous oil (EVO) from the reservoir model, the composition, which provides a 96% extraction of the oil from Ashal?chinskoe deposit, has been chosen. The composition represents the mixture of large-capacity petrochemical products. It includes the fraction of light aliphatic hydrocarbons, ethylbenzene distillation residue, and the mixture of aromatic hydrocarbons at a 0.50:0.25:0.25 ratio. The latter inhibi...