Wells – Processes – Distinct – separate injection and producing wells
Patent
1988-12-02
1990-02-27
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166252, 166303, 166902, E21B 4324, E21B 4700, E21B 4706
Patent
active
049037692
ABSTRACT:
A method for inhibiting permeability damage of a hydrocarbon formation containing clay minerals in the vicinity of a well penetrating the formation. It comprises: injecting a wet steam that includes (a) an amount of ammonia in the vapor phase of the wet steam to produce a concentration of ammonium ions in the vapor phase condensate of the wet steam effective to inhibit permeability damage of the formation in the vicinity of the vapor phase, and (b) an amount of a bicarbonate salt of the alkali metals, or mixtures thereof, effective to raise the liquid phase pH of the wet steam to within the range of about 7.5 to about 10.5.
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Hsueh Liming
Reed Marion G.
Chevron Research Company
Keeling Edward J.
Suchfield George A.
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