Current paper describes the work carried out on a layered reservoir in order to understand the miscible flood efficiency by controlling the velocity field in the individual layers of the heterogeneous reservoir. Heterogeneity in the reservoir can cause the early breakthrough of the solvent, and channelling through least resistance paths. Furthermore, the heterogeneity can be responsible for wider mixing zone between displacing and displaced fluid causing the loss of miscibility in the system, and wider dispersion of the solvent, this reduces the pore scale displacement efficiency of the reservoir.

The major forces involved in the displacement efficiency of the miscible floods such as, viscous, gravity, cross flow and capillary need to be accounted as well to properly model the sweep efficiencies in the system as they are directly responsible for reduced performance caused by viscous fingering, gravity tonguing, and dispersion.

Numerical reservoir simulation is intended to provide the insight into work done on the layered reservoir model where by controlling the injection rates of the solvent into the layers it is deemed to control the velocity fields inside the reservoir since mixing, capillary and gravity forces are all rate dependent, through this, more controlled injected solvent fronts can be produced, which to some extent are capable of increasing the sweep efficiency of the reservoir and prolong the breakthrough time. This is carried out by considering the selective smart injection/production of the solvent in the layers which is more kind of mechanical method of flood profile control although use of smart completions in miscible floods has not been discussed before in the literature. Use of smart completion is thus in current study is applied to the injectors also which is provided to give analysis on reservoir sweep efficiencies under the different microscopic and macroscopic driving forces. This can be significant in existing or potential EOR fields where smart completions already exist and can be utilized much effectively for the purposes of EOR operations.

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