SPE Annual Technical Conference and Exhibition · 1994 · 16 citations · 7 references
EngineeringPetroleum EngineeringReservoir EngineeringReservoir SimulationSubsurface Fluid FlowFluid-flow In Porous MediaMultiphase Flow In ReservoirsPermeability CharacterizationRock-fluid InteractionsTight Oil ReservoirsWater-alternating-gas InjectionFlow Through Porous RockGas PermeabilityOil SwellingOil Swelling EffectsPorous MediaPressure RegulationRelative Permeability HysteresisResidual Oil Saturation
ABSTRACT Dry gas/water injections were performed under immiscible conditions in a water-wet 80 cm long sandstone, to analyse unidimensional aspects of water alternating gas (WAG) process in porous media. Experiments were conducted under tertiary conditions at constant flow-rate, with a continuous pressure regulation in the gas injected cell, maintained at the pressure reached during each imbibition step, prior to any drainage period. Residual oil was a crude saturated or not with methane to determine the influence of swelling. A modelling of several of these laboratory experiments is also presented, taking into account oil swelling and gas relative permeability hysteresis. The typical mechanisms of WAG flow in porous medium are highlighted and the simulations are shown to reproduce these features as well as extra oil production.
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