Process for reducing permeability in a subterranean hydrocarbon-

Details Process for reducing permeability in a subterranean hydrocarbon- Process for reducing permeability in a subterranean hydrocarbon-

1995-06-05

1997-07-22

Haley, Jacqueline

Earth boring, well treating, and oil field chemistry

Preventing contaminant deposits in petroleum oil conduits

507140, 166296, E21B 4325, E21B 33138

Patent

active

056503792

ABSTRACT:
A process and composition are provided for permeability reduction in a hydrocarbon-bearing formation to improve hydrocarbon recovery therefrom. The process includes placement of a crosslinked polymer gel in the treatment region preceded by surface preparation of a gelation solution which is the gel precursor. The gelation solution contains a crosslinkable polymer, a chromium(III)/carboxylate complex crosslinking agent, a carboxylate salt delaying agent and an aqueous solvent. The gel is placed in the treatment region by injecting the gelation solution into a well bore in fluid communication with the formation, displacing it into the desired treatment region and gelling the solution to completion forming the permeability-reducing gel in situ. The gelation rate is retarded in a controlled manner by adjusting the composition or concentration of the delaying agent in the gelation solution.

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Lockhart et al., "Gelation-Delaying Additives for Cr.sup.3+ /Polymer Gels," SPE/DOE 25221, Mar. 1993.

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