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-

1994-01-03

1995-06-06

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166300, 507903, 523130, E21B 33138

Patent

active

054214114

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., "A New Gelation Technology For In-Depth Placement of Cr.sup.3+ /Polymer Gels In High-Temperature Reservoirs," SPE/DOE 24194, Apr. 1992.
Lockhart et al., "Gelation-Delaying Additives For Cr.sup.3+ /Polymer Gels", SPE 25221, Mar. 1993.

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