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US 6,610,140 B2Granted
Delayed thixotropic cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJan Pieter Vijn, Bach Dao
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Abstract
Delayed thixotropic cement compositions and methods of cementing in subterranean zones penetrated by well bores are provided. The novel cement compositions are basically comprised of a hydraulic cement, sufficient water to form a slurry and a water soluble delayed thixotropy imparting additive selected from the group consisting of carbonic acid and alkali metal carbonates.
Claims27
A delayed thixotropic cementing composition comprising:
- a hydraulic cement;
- sufficient water to form a slurry;
- and
- a water soluble delayed thixotropy imparting additive selected from the group consisting of carbonic acid and carbonates, wherein thixotropic properties of said cement composition are delayed for a period of time after said cement composition is formed.
1 more element
A delayed thixotropic well cementing composition comprising:
- Portland cement;
- sufficient water to form a slurry;
- and
- a water soluble delayed thixotropic imparting additive comprised of sodium carbonate present in an amount in the range of from about 0.1% to about 8% by weight of said cement in said composition, wherein thixotropic properties of said cement composition are delayed for a period of time after said cement composition is formed.
1 more element
Dependencies are inferred from the claim text.