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US 6,562,122 B2Granted
Lightweight well cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsBach Dao, Krishna M. Ravi, Jan Pieter Vijn, Christine Noik, Alain Rivereau
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Abstract
Lightweight cement compositions and methods of cementing a subterranean zone penetrated by a well bore utilizing the compositions are provided. A lightweight cement composition of the invention is basically comprised of a coarse particulate hydraulic cement, an ultrafine particulate hydraulic cement mixture comprised of slag cement and a Portland or equivalent cement, fly ash, fumed silica, hollow glass spheres and water.
Claims20
A lightweight cement composition for cementing a subterranean zone penetrated by a well bore comprising:
- a coarse particulate hydraulic cement;
- an ultrafine particulate hydraulic cement mixture comprised of slag cement and a Portland or equivalent cement present in an amount in the range of from about 50% to about 150% by weight of said coarse particulate hydraulic cement in said composition;
- fly ash present in an amount in the range of from about 50% to about 150% by weight of said coarse particulate hydraulic cement in said composition;
- fumed silica present in an amount in the range of from about 20% to about 60% by weight of said coarse particulate hydraulic cement in said composition;
- hollow glass spheres present in an amount sufficient to impart a density to said cement composition in the range of from about 9 to about 13 pounds per gallon;
- and
- water present in an amount sufficient to form a slurry.
4 more elements
Dependencies are inferred from the claim text.