The Sooner Unit produces a volatile crude oil from a low permeability Cretaceous sandstone reservoir. Primary production resulted in a gas saturation estimated to exceed 20% of pore volume.

Modelling studies, analysis of similar reservoirs, and Sooner Unit production history have demonstrated a need to repressure the reservoir prior to displacement under "steady state" conditions. The principal benefit to displacement at high pressure is derived from the ability to manage gas saturation and reservoir voidage and prevent early water breakthrough. The effect of reduced oil viscosity and lower mobility ratio at high pressure is of minor significance.

Repressurization of the reservoir has been accelerated recently by the initiation of gas injection.

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