| 摘要 |
<p>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 cross-linked polymer gel in the treatment region preceded by surface preparation of a gelation solution which is the gel precursor. The gelation solution contains 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 fluid communication with the formation, displacing the gelation solution into the desired treatment region and gelling the solution to completion forming the permeability-reducing gel in situ. The inorganic fluoride salt stabilizing agent promotes the long-term stability of the gel in the treatment region, particularly at high temperatures.</p> |
