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US 5,341,881 AGranted
Cement set retarding additives, compositions and methods
AssigneeHalliburton Company
InventorKlein A. Rodrigues
Life of this patent
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Abstract
Cement set retarding additives, set retarded hydraulic cement compositions and methods of using the cement compositions for cementing zones in wells are provided. The set retarding additives are copolymers containing monomer units formed from a first monomer of acrylic acid or methacrylic acid and a second monomer of acrylamide or a derivative of acrylamide.
Claims8
A method of cementing a subterranean zone penetrated by a well bore comprising the steps of:
- forming a pumpable set retarded cement composition comprised of hydraulic cement, sufficient water to form a pumpable slurry and a set retarding additive comprising a copolymer consisting essentially of monomer units formed from a first monomer selected from the group consisting of acrylic acid and methacrylic acid and a second monomer selected from the group consisting of acrylamide, methacrylamide, N,N-dimethylacrylamide, N-methyl-acrylamide, N-isopropylacrylamide and N-(hydroxymethyl) acrylamide;
- pumping said composition into said zone by way of said well bore;
- and
- allowing said cement composition to set.
1 more element
The method of claim 19 wherein said water is present in said composition in an amount in the range of from about 30% to about 60% by weight of cement therein.
Dependencies are inferred from the claim text.