A numerical simulation study was undertaken to determine the best completion scheme for the sidewell in an inverted nine-spot pattern. Simulation results showed that completing the sidewell across the bottom 20% (1/5) of the target interval produces the largest cumulative oil at the lowest cumulative steam-oil ratio. This completion scheme was found to be best regardless of the pattern size (2.5 or 5.0 acres) and the initial reservoir temperature (90 or 200°F).

If an intermediate shale lense is present in the sand, the oil additionally recovered by partially completing the sidewell over that by fully completing it decreases with a decrease in vertical permeability of the shale lense. This results because the effects of steam override and gravity drainage diminish with decreasing vertical permeability.

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