Wells – Processes – Cementing – plugging or consolidating
Patent
1993-03-26
1994-06-21
Suchfield, George A.
Wells
Processes
Cementing, plugging or consolidating
166300, 166309, E21B 33138
Patent
active
053221257
ABSTRACT:
A process is provided for reducing the inhibiting effect of gas coning on liquid hydrocarbon production at a production wellbore penetrating a subterranean reservoir having a gas cap overlying a liquid hydrocarbon producing zone in fluid communication with the gas cap across vertical flowpaths of gas-permeable matrix. A foamed gel containing a crosslinkable polymer, a crosslinking agent, an aqueous solvent, a surfactant, and a gas is injected through the production wellbore into gas-permeable matrix between the gas cap and wellbore, thereby effectively blocking or reducing the downward flow of gas from the gas cap to the production wellbore and enabling the more desirable liquid hydrocarbons to enter the wellbore for production to the surface.
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Hanssen, J. E., et al., "Foams for Effective Gas Blockage in the Presence of Crude Oil", SPE/DOE Paper No. 20193, Apr. 22, 1990.
Persoff, P., et al., "Aqueous Foams for Control of Gas Migration and Water Coning in Aquifer Gas Storage", Energy Sources, 1990.
Marathon Oil Company
Suchfield George A.
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