Method and composition for breaking crosslinked gels
AssigneeHalliburton Company
InventorsPhillip C. Harris, Stanley J. Heath
Life of this patent
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Abstract
Compositions and methods are provided which provide improved viscosity reduction of crosslinked hydratable polymer treating fluids in the presence of uncured resin-coated proppants. The uncured resins are generally uncured phenolic or furan resins. The breaker comprises an oxidizing agent to which is added a sequestering agent comprising a copolymer of vinylpyrrolidone and acrylic acid to sequester at least a portion of any phenolic extracts from said resin that may be present in said treating fluid from contact with the uncured resin.
Claims12
A composition comprising:
- a crosslinked gel comprising an aqueous fluid hydrated polymer and a crosslinking agent;
- a curable resin coated upon a particulate comprising an at least partially uncured phenolic resin or uncured furan resin;
- a crosslinked gel breaker comprising an oxidizing agent;
- and
- a sequestering agent comprising a copolymer of vinylpyrrolidone and acrylic acid.
A method of reducing the viscosity of a hydrated polymer gel containing a particulate comprising:
- providing a hydrated polymer gel containing a particulate having an at least partially uncured coating of a phenolic or furan resin thereon;
- admixing an oxidizing breaker with said gel;
- and
- admixing a sequestering agent with said gel comprising a copolymer of vinylpyrrolidone and acrylic acid to sequester at least a portion of any phenolic extracts in said gel from said particulate coating.
Dependencies are inferred from the claim text.