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US 6,846,357 B2Granted
Methods of cementing high temperature wells and cement compositions therefor
AssigneeHalliburton Energy Services, Inc.
InventorsBaireddy R. Reddy, Lance E. Brothers, Anthony V. Palmer
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Abstract
The present invention light weight high temperature well cement compositions and methods. The compositions are basically comprised of calcium aluminate, ASTM class F fly ash, sodium polyphosphate, a cationic derivatized starch fluid loss control additive and water.
Claims36
A cement composition comprising:
- calcium aluminate;
- fly ash;
- sodium polyphosphate;
- a cationic derivatized starch fluid loss control additive;
- and
- water.
3 more elements
A cement composition comprising:
- calcium aluminate present in an amount in the range of from about 15% to about 50% by weight of the composition;
- fly ash present in an amount in the range of from about 15% to about 50% by weight of the composition;
- sodium polyphosphate present in an amount sufficient to combine with the calcium aluminate to form calcium phosphate;
- a cationic derivatized starch fluid loss control additive present in an amount sufficient to prevent fluid loss from the composition;
- and
- water present in an amount sufficient to form a pumpable slurry.
3 more elements
A cement composition comprising:
- calcium aluminate present in an amount in the range of from about 15% to about 50% by weight of the composition;
- fly ash present in an amount in the range of from about 15% to about 50% by weight of the composition;
- sodium polyphosphate present in an amount in the range of from about 2% to about 13% by weight of the composition;
- a fluid loss control additive comprises a cationic derivatized starch present in an amount in the range of from about 0.5% to about 2% by weight of the composition;
- and
- sufficient water to form a pumpable slurry.
3 more elements
A cement composition comprising:
- calcium aluminate present in an amount of about 30.4% by weight of the composition;
- fly ash present in an amount of about 30.4% by weight of the composition;
- sodium polyphosphate present in an amount of about 3.2% by weight of the composition;
- a fluid loss control additive comprising a cationic derivatized starch present in an amount of about 1.1% by weight of the composition;
- and
- water present in an amount of about 33.7% by weight of the composition.
3 more elements
Dependencies are inferred from the claim text.