Abstract: The present disclosure includes the use of grids composed solely or in part of a set of contiguous cells having six or more principal flow directions within a single layer is disclosed for use in numerical simulation. The grids are particularly well-adapted for use in modeling flow in hydrocarbon-bearing reservoirs where fingering or channeling is experienced. Methods of constructing a bisected periodic grid and a substantially constant width radial grid in connection with the present disclosure are also provided. The problem of grid orientation effects is lessened by providing grids with an increased number of principal flow directions, typically six or more. The improved grids may be used in many preexisting simulators.

Abstract: A method of operating a cyclic solvent-dominated recovery process (CSDRP) for recovering viscous oil from a subterranean reservoir of the viscous oil. The cyclic solvent process involves using an injection well to inject a viscosity-reducing solvent into a subterranean viscous oil reservoir. Reduced viscosity oil is produced to the surface using the same well used to inject solvent. The process of alternately injecting solvent and producing a solvent/viscous oil blend through the same wellbore continues in a series of cycles until additional cycles are no longer economical. Aspects of the invention relate to the particular volume of solvent injected in each cycle, when to switch from production to injection, the injection pressure to be used, the production pressure to be used, and to middle and late life operation.

Abstract: The present disclosure includes the use of grids composed solely or in part of a set of contiguous cells having six or more principal flow directions within a single layer is disclosed for use in numerical simulation. The grids are particularly well-adapted for use in modeling flow in hydrocarbon-bearing reservoirs where fingering or channeling is experienced. Methods of constructing a bisected periodic grid and a substantially constant width radial grid in connection with the present disclosure are also provided. The problem of grid orientation effects is lessened by providing grids with an increased number of principal flow directions, typically six or more. The improved grids may be used in many preexisting simulators.