| 摘要 |
A process and composition are provided for permeability reduction in a hydrocarb on-bearing formation to improve hydrocarbon recovery therefrom. The process includes placement of a cross-linked polymer gel in the treatment region preceded by surface preparation of a gelation solution which is the gel precursor. The gelation solution contain s a cross-linkable polymer, a chromium(III)/carboxylate complex cross-linking agent, an inorganic fluoride salt stabilizing agent and an aqueous solvent containing hard salts. The gel is placed in the treatment region by injecting the gelation solution into a well bore in flui d communication with the formation, displacing the gelation solution into the desired treatment region and gelling the solution to completio n forming the permeability-reducing gel in situ. The inorganic fluoride salt stabilizing agent promotes the long-term stability of the gel in t he treatment region, particularly at high temperature.
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