Composition and methods for reducing the permeability of undergr

Details Composition and methods for reducing the permeability of undergr Composition and methods for reducing the permeability of undergr

1988-05-09

1989-06-06

Ivy, C. Warren

Wells

Processes

Cementing, plugging or consolidating

252 8551, E02B 312

Patent

active

048362859

ABSTRACT:
The invention provides a method for the enhanced recovery of oil from an oil-bearing stratum having a zone of high fluid permeability through plugging of this zone by introducing into the stratum a gelable solution which, in the case of use under moderately high operating temperatures in the stratum, comprises a polyphenolic lignin extract, a formaldehyde source and sufficient alkaline material to give a solution having a pH of at least 9.0 and which, in the case of higher operating temperatures, comprises a lignosulfonate and a source of formaldehyde or tannin in aqueous solution.

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