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US 5,346,012 AGranted
Fine particle size cement compositions and methods
AssigneeHalliburton Company
InventorsJames F. Heathman, Ronald J. Crook
Life of this patent
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Abstract
Fine particle size cement compositions and methods of using such compositions for cementing in a subterranean zone penetrated by a well bore are provided. The compositions are basically comprised of a fine particle size hydraulic cement, a fine particle size pozzolanic material and sufficient water to form a pumpable slurry.
Claims15
A method of cementing in a subterranean zone penetrated by a well bore comprising the steps of:
- pumping a fine particle size cement composition into said zone, said cement composition comprising:
- a fine particle size hydraulic cement wherein the particles are of a size no greater than about 30 microns and have a Blaine Fineness no less than about 6000 square centimeters per gram;
- a fine particle size pozzolanic material characterized by a low calcium hydroxide content whereby it does not chemically react at ordinary temperatures in the presence of water to form a cementitious compound without the addition of calcium hydroxide thereto and which in the presence of water combines with calcium hydroxide released by the hydration of said hydraulic cement wherein the particles are of a size no greater than about 30 microns and have a Blaine Fineness no less than about 5,000 square centimeters per gram, said pozzolanic material being present in said composition in an amount in the range of from about 20% to about 90% by weight of cement therein;
- sufficient water to form a pumpable slurry;
- and
- allowing said cement composition to set into a hard substantially impermeable mass in said zone.
3 more elements
A method of cementing in a subterranean zone penetrated by a well bore comprising the steps of:
- pumping a fine particle size cement composition into said zone, said cement composition comprising:
- a fine particle size hydraulic cement wherein the particles are of a size no greater than about 30 microns and have a Blaine Fineness no less than about 6000 square centimeters per gram;
- a fine particle size pozzolanic material which in the presence of water combines with calcium hydroxide released by the hydration of said hydraulic cement wherein the particles are of a size no greater than about 30 microns and have a Blaine Fineness no less than about 5,000 square centimeters per gram, said pozzolanic material being ASTM Class F fine particle size fly ash and present in said composition in an amount in the range of from about 20% to about 90% by weight of cement therein;
- sufficient water to form a pumpable slurry;
- and
- allowing said cement composition to set into a hard substantially impermeable mass in said zone.
3 more elements
Dependencies are inferred from the claim text.