Use of radiation-induced polymers in cement slurries
AssigneeHercules Incorporated
InventorsBruce L. Knight, John S. Rhudy, William B. Gogarty
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Abstract
Water loss from cement slurries is reduced by incorporating within a cement slurry a polymer obtained as a product of radiation-induced polymerization of acrylamide and/or methacrylamide and acrylic acid, methacrylic acid, and/or alkali metal salts thereof. The polymerization is preferably carried out in 10-60% aqueous monomer solution with gamma radiation. The aqueous monomer solution preferably contains 25-99% acrylamide and 75-1% sodium acrylate. The polymer can be present in concentration of about 0.001 to about 3.0 weight percent, based on the aqueous phase of the slurry.
Claims17
A cement slurry comprised of a water phase containing a polymer obtained as a product of high energy ionization radiation polymerization of at least one monomer selected from the group consisting of acrylamide and methacrylamide and at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate in concentrations of about 10% to about 60% by weight dissolved monomer in an aqueous medium, the radiation intensity being about 250 to about 1,000,000 rads and the radiation dose being about 500 rads to about 300,000 rads.
A cement slurry comprised of a water phase containing a polymer obtained as a product of radiation copolymerization of an aqueous solution comprised of about 10 to about 60% of a mixture of about 25% to about 99% of acrylamide and about 75% to about 1% of sodium acrylate, the radiation intensity being within the range of about 250 to about 1,000,000 rads/hr and the radiation dose being about 500 rads to about 300,000 rads.
Dependencies are inferred from the claim text.