This paper summarizes results from gas gravity drainage experiments at different water saturations. The initial water saturation was varied from zero to very high water saturations where water starts to segregate during gravity drainage. The fluid distribution detected by in-situ saturation measurements along the core was compared to effluent production.

The results show that oil recovery by gas gravity drainage depends on the connate water saturation. A maximum in the oil recovery was observed at intermediate high water saturation. The total residual liquid phase (sum of oil and brine) increased at high initial water saturation.

The experimental results show that water-oil capillary forces influence the total liquid production by gravity drainage. The oil relative permeability increased with connate water present.

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