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US 6,796,378 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 provides 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.
Claims13
A method of cementing a high temperature subterranean zone penetrated by a well bore comprising the steps of:
- (a) providing a well cement composition comprised of calcium aluminate, fly ash, sodium polyphosphate, a cationic derivatized starch fluid loss control additive and sufficient water to form a pumpable slurry;
- (b) pumping said cement composition into said subterranean zone by way of said well bore;
- and
- (c) allowing said cement composition to set into a hard impermeable mass therein.
1 more element
A method of cementing a high temperature subterranean zone penetrated by a well bore comprising the steps of:
- (a) providing a well cement composition comprised of calcium aluminate present in an amount of about 30.8% by weight of said composition, ASTM class F fly ash present in an amount of about 30.8% by weight of said composition, sodium polyphosphate present in an amount of about 3.2% by weight of said composition, a fluid loss control additive comprised of a cationic derivatized starch present in an amount of about 1.2% by weight of said composition, and water present in an amount of about 34% by weight of said composition;
- (b) pumping said cement composition into said subterranean zone by way of said well bore;
- and
- (c) allowing said cement composition to set into a hard impermeable mass therein.
1 more element
Dependencies are inferred from the claim text.