Light weight high temperature well cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsLance E. Brothers, Susan M. Turkett, Barry B. Ekstrand, D. Chad Brenneis, Jerry D. Childs
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Abstract
The present invention provides methods of cementing subterranean zones using cement compositions comprising calcium aluminate, fly ash, sodium polyphosphate and water.
Claims49
A method of cementing a subterranean zone comprising the steps of:
- preparing a well cementing composition comprising calcium aluminate, fly ash, sodium polyphosphate, sufficient water to form a pumpable slurry, and a set retarder for lengthening the amount of time it takes said slurry to thicken and set;
- pumping said well cementing composition into the subterranean zone;
- and
- allowing said well cementing composition to set into a hard impermeable mass therein.
A method of cementing a subterranean zone comprising the steps of:
- preparing a well cementing composition comprising calcium aluminate, ASTM class F fly ash, sodium polyphosphate present in an amount in the range of from about 5% to about 20% by weight of the composition, sufficient water selected from the group consisting of fresh water and saltwater to form a pumpable slurry, and a set retarder for lengthening the amount of time it takes said slurry to thicken and set;
- pumping said well cementing composition into the subterranean zone;
- and
- allowing said well cementing composition to set into a hard impermeable mass therein.
A method of cementing a subterranean zone comprising the steps of:
- preparing a well cementing composition comprising calcium aluminate, fly ash, sodium hexametaphosphate, sufficient water to form a pumpable slurry, and a set retarder for lengthening the amount of time it takes said slurry to thicken and set;
- pumping said well cementing composition into the subterranean zone;
- and
- allowing said well cementing composition to set into a hard impermeable mass therein.
A method of cementing a subterranean zone comprising the steps of:
- preparing a well cementing composition comprising calcium aluminate, fly ash, sodium polyphosphate present in an amount in the range of from about 5% to about 20% by weight of the composition, sufficient water to form a pumpable slurry, and a set retarder for lengthening the amount of time it takes said slurry to thicken and set;
- pumping said well cementing composition into the subterranean zone;
- and
- allowing said well cementing composition to set into a hard impermeable mass therein.
A method of cementing a subterranean zone comprising the steps of:
- preparing a well cementing composition comprising calcium aluminate, fly ash, sodium phosphate selected from the group consisting of sodium polyphosphate, sodium hexametaphosphate, sodium triphosphate and vitreous sodium phosphate, sufficient water to form a pumpable slurry, and a set retarder for lengthening the amount of time it takes said slurry to thicken and set;
- pumping said well cementing composition into the subterranean zone;
- and
- allowing said well cementing composition to set into a hard impermeable mass therein.
The method of claim wherein said subterranean zone is a high temperature subterranean zone containing carbon dioxide.
Dependencies are inferred from the claim text.