Multi-step solvent extraction process for heavy oil reservoirs

摘要: There is disclosed a multi-step in situ extraction process for heavy oil reservoirs using solvent having various steps, including, removing, from areas contact with said oil, blockers to create voids and increase an interfacial area of unextracted contactable by injecting vapour form into the raise reservoir pressure until sufficient present liquid fill increased oil. Next shut period time permit diffuse across filled ripening step reduced viscosity blend one or more characteristics measured confirm extent dilution that has occurred reservoir. Then gravity drainage based production started once low enough drain through well.