Set retarded cement compositions and methods for well cementing
AssigneeHalliburton Company
InventorsLance E. Brothers, Donald W. Lindsey, Dralen T. Terry
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Abstract
Set retarded cement compositions for cementing across a zone or zones in a well having enhanced compressive strength and rapid gel strength development after placement. The cement compositions are comprised of hydraulic cement, sufficient fresh water to form a pumpable slurry, a set retarder comprising a copolymer of 2-acrylamido, 2-methylpropane sulfonic acid and acrylic acid having an average molecular weight below about 5000 and any other desired additives. Methods of cementing utilizing the cement composition also are provided.
Claims12
A method of cementing a subterranean zone penetrated by a wellbore comprising the steps of:
- forming a pumpable set retarded cement slurry comprising hydraulic cement, fresh water, a set retarder comprising a copolymer consisting essentially of 2-acrylamide, 2-methylpropane sulfonic acid (AMPS) and acrylic acid having an average molecular weight below about 5000 and comprising from about 40 to about 60 mole percent AMPS and a fluid loss additive;
- pumping said cement slurry into said zone by way of said wellbore;
- and
- allowing said cement slurry to set therein.
A method of cementing a zone in a subterranean formation penetrated by a wellbore comprising the steps of:
- forming a pumpable set retarded cement slurry comprising hydraulic cement, fresh water, particulate silica having a particle size in the range of from about 0.02 to about 0.5 micron and a set retarder comprising a copolymer consisting essentially of 2-acrylamido, 2-methylpropane sulfonic acid (AMPS) and acrylic acid having an average molecular weight below about 5000 and comprising from about 40 to about 60 mole percent AMPS;
- pumping said cement slurry into said zone by way of said wellbore, and
- allowing said cement slurry to set therein.
Dependencies are inferred from the claim text.