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Permeability modifying composition for use in oil recovery

  • US 5,654,261 A
  • Filed: 07/26/1996
  • Issued: 08/05/1997
  • Est. Priority Date: 11/16/1994
  • Status: Expired due to Term
First Claim
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1. A permeability-modifying composition in dry form comprising a mixture of a water-soluble polymer capable of cross linking in the presence of water and aluminum ions, and an aluminum citrate preparation having at least about 7 percent aluminum by weight, at least about 1.1 percent chloride by weight, and a molar ratio of aluminum to citrate of between about 0.5:

  • 1 and about 2.2;

    1 in an amount sufficient to enhance cross linking of said polymer.

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