Wells – Processes – Distinct – separate injection and producing wells
Patent
1982-09-29
1984-12-18
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166273, 166295, 166300, E21B 4322, E21B 33138
Patent
active
044886012
ABSTRACT:
A method and fluid for selectively reducing the permeability of an oil-bearing subterranean formation is disclosed, wherein a cross-linkable polymer, a cross-linking agent and a spacer fluid are alternately injected. The spacer, such as sodium citrate, permits repeated injection cycles of the polymer and cross-linking agents without excessive polymer retention at or near the formation face. Such retention filters out polymers and inhibits polymer propagation throughout the formation. The present invention also permits controlled deep penetration of the cross-linked polymer into the formation to increase oil recovery.
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Suchfield George A.
The Standard Oil Company
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