| 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 crosslinked polymer gel in the treatment region preceded by surface preparation of a gelation solution which is the gel precursor. The gelation solution containing a crosslinkable polymer and chromium(III)/carboxylate complex crosslinking agent is prepared by preforming the crosslinking agent in isolation from the polymer and thereafter combining the crosslinking agent and polymer in solution. The starting materials for the complex crosslinking agent are an organic chromium(III) salt and a selected polycarboxylate or alpha-hydroxy carboxylate anion. The gel is placed in the treatment region by injecting the gelation solution into the formation, displacing it into the desired treatment region and gelling the solution to completion forming the permeability-reducing gel in situ.</p> |
