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.
Claims44
A method of cementing in a subterranean zone comprising the steps of:
- preparing a lightweight cement composition comprising a coarse particulate hydraulic cement, an ultrafine particulate hydraulic cement mixture of slag cement and a Portland or equivalent cement, fly ash, fumed silica, hollow glass spheres and sufficient water to form a slurry;
- placing said cement composition in said subterranean zone;
- and
- allowing said cement composition to set.
A method of cementing in a subterranean zone comprising the steps of:
- preparing a cement composition comprising:
- a coarse particulate hydraulic cement,
- an ultrafine particulate hydraulic cement mixture comprising 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;
- placing said cement composition in said subterranean formation;
- and
- allowing said cement composition to set.
Dependencies are inferred from the claim text.