Process for reducing permeability in a high-temperature subterra

Details Process for reducing permeability in a high-temperature subterra Process for reducing permeability in a high-temperature subterra

1994-01-03

1995-07-11

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166288, 166300, 507903, 523130, E21B 33138

Patent

active

054312264

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 from which the gel is formed. The gelation solution contains a crosslinkable polymer, a transition metal/poly-carboxylate precursor complex 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, activating the gelation solution in situ, displacing the gelation solution 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 molar ratio of the polycarboxylate to transition metal in the precursor complex of the gelation solution.

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Lockhart et al., "A New Gelatin 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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