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US 6,182,758 B2Granted
Dispersant and fluid loss control additives for well cements, well cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorJan Pieter Vijn
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Abstract
Biodegradable dispersing and fluid loss control additives for well cements, well cement compositions including the additives and methods of using the well cement compositions are provided. The well cement compositions are basically comprised of a hydraulic cement, water in an amount sufficient to form a slurry and a dispersing and fluid loss control additive comprised of casein. A second agent which also provides fluid loss control can optionally be included in the additive.
Claims11
A method of cementing a subterranean zone penetrated by a well bore comprising the steps of:
- (a) preparing a cement composition comprising a hydraulic cement, sufficient water to form a pumpable slurry and a dispersing and fluid loss control additive comprised of casein;
- (b) placing said cement composition in said zone to be cemented;
- and
- (c) allowing said cement composition to set into an impermeable solid mass therein.
1 more element
Dependencies are inferred from the claim text.