The wettability of Berea and chalk samples for gas-oil and gas-water fluids were altered from strong liquid-wetting to intermediate gas-wetting. Two polymers. FC-722 and FC-759, were used to alter the wettability. FC-759 is soluble in water and some 20 times less expensive than FC-722.Gas and liquid relative permeabilities were measured before and after wettability alteration. The results demonstrated a significant increase in lqiuid-phase relative permeability. Gas-phase relative permeability for a fixed saturation may increase or decrease. Howeve,r because of the very high lqiuid mobility and reduced limiqud saturation, the gas mobility also increased for a fixed pressure drop.
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