Method and composition for reducing the permeability of a high-p

Details Method and composition for reducing the permeability of a high-p Method and composition for reducing the permeability of a high-p

1991-01-17

1992-07-21

Suchfield, George A.

Compositions

Leather or fur treating

166281, 166295, 166300, 2523154, 523130, E21B 33138, E21B 4322

Patent

active

051320290

ABSTRACT:
A method for reducing the permeability of a high-permeability zone in a high-temperature oil reservoir comprises:
preparing a gellable polymeric aqueous solution, operating on the surface under controlled conditions;
injecting said gellable solution into the oil reservoir through a well;
moving the solution through the reservoir until it reaches and substantially fills the high-permeability zone to be treated; and
gelling the solution in situ with consequent lowering of the permeability in said high-permeability zone, and is essentially characterized in that the gellable solution is an aqueous solution containing a Cr(III) ion cross-linking agent and a water-soluble organic polymer cross-linkable by the effect of said cross-linking agent, said solution being free or substantially free of ligands for the cross-linking agent and having a pH adjusted to a value within the range of 1.5 to 5.5, depending on the desired gelling time.

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