Wells – Processes – Placing fluid into the formation
Patent
1993-01-07
1994-05-03
Novosad, Stephen J.
Wells
Processes
Placing fluid into the formation
166371, 166309, E21B 4332
Patent
active
053078780
ABSTRACT:
A process is provided for reducing the inhibiting effect of gas coning on liquid hydrocarbon production into a production wellbore penetrating a subterranean formation having a gas cap overlying a liquid hydrocarbon producing zone in fluid communication with the gas cap. A polymer enhanced foam containing a polymer, an aqueous solvent, a surfactant, and a gas is placed in gas-permeable anomalies or matrix between the production wellbore and gas cap, thereby effectively blocking the downward flow of gas from the gas cap to the production wellbore and enabling desirable liquid hydrocarbons to more readily enter the wellbore for production to the surface.
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Persoff, P., et al., "Aqueous Foams for Control of Gas Migration and Water Coning in Aquifer Gas Storage", Energy Sources, 1990.
Marathon Oil Company
Novosad Stephen J.
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