Method for selectively closing an intermediate zone of a near we

Details Method for selectively closing an intermediate zone of a near we Method for selectively closing an intermediate zone of a near we

1991-12-19

1993-06-01

Suchfield, George A.

Wells

Processes

Distinct, separate injection and producing wells

166272, 166302, 166295, E21B 33138, E21B 4324

Patent

active

052151476

ABSTRACT:
A method for selectively closing an intermediate zone of a near wellbore area in a formation. Initially, a drillable mechanical packer is placed into the wellbore below the intermediate zone. The wellbore area adjacent to the intermediate zone is cooled to a critical temperature between about 130.degree. to about 180.degree. F. Subsequently, a novolac or resole-type phenolformaldehyde resin containing an acid catalyst is placed into the wellbore where it forms a solid platform over the packer and intermediate zone in about 2 hours. The critical temperature is maintained in the wellbore and intermediate zone while placing a second resinous material containing an alkaline catalyst into the wellbore and intermediate zone. Thereafter, the second material forms a steam resistant solid gel in the intermediate zone, thereby closing it.

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