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US 5,398,759 AGranted
Set retarded ultra fine cement compositions and methods
AssigneeHalliburton Company
InventorsKlein A. Rodrigues, Donald W. Lindsey
Life of this patent
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Abstract
Set retarded ultra fine cement compositions which remain pumpable for a predictable period of time at temperatures up to about 400.degree. F. are provided. The compositions are basically comprised of an ultra fine hydraulic cement, sufficient water to form a pumpable slurry and a set retarder comprised of a water soluble aliphatic compound containing at least three carbon atoms and at least one phosphonic acid or phosphonate group.
Claims8
A method of cementing a subterranean zone penetrated by a wellbore at a temperature in the range of from about 40.degree. F. to about 400.degree. F. comprising the steps of:
- pumping a set retarded ultra fine cement composition into said zone, said cement composition consisting essentially of,
- an ultra fine hydraulic cement having a particle size no greater than about 30 microns and a Blaine Fineness no less than about 6000 square centimeters per gram.
- sufficient water to form a pumpable slurry, and
- a set retarder comprised of a water soluble aliphatic compound containing at least three carbon atoms and at least one phosphonic acid or phosphonate group present in said slurry in an amount in the range from about 0.01 to about 5.0 pounds per 100 pounds of dry cement therein.
1 more element
Dependencies are inferred from the claim text.