Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carbohydrate or derivative as a reactant
Patent
1993-06-16
1994-04-19
Griffin, Ronald W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carbohydrate or derivative as a reactant
527312, 523130, 523131, 166278, 166308, 1663051, 252 8551, C09K 700, E21B 4304, E21B 4325, E21B 4326
Patent
active
053046200
ABSTRACT:
The present invention provides a method of treating of subterranean formation using a gel of a graft copolymer of a hydroxyalkyl cellulose, guar or hydroxypropyl guar prepared by a redox reaction with vinyl phosphonic acid. The gel is formed by hydrating the graft copolymer in an aqueous liquid containing at least a trace amount of at least one divalent cation. The gel is crosslinked by the addition of a Lewis base or Bronsted-Lowry base, which is substantially free of polyvalent metal ions, to the gel in an amount sufficient to effect crosslinking of the graft copolymer.
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Clark Murray G.
Holtmyer Marlin D.
Hunt Charles V.
Laramay Mary A. H.
Rahimi Alireza B.
Griffin Ronald W.
Halliburton Company
Kent Robert A.
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