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US 6,681,856 B1Granted
Methods of cementing in subterranean zones penetrated by well bores using biodegradable dispersants
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, D. Chad Brenneis, Roger S. Cromwell
Life of this patent
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Abstract
The present invention provides methods of cementing subterranean zones penetrated by well bores using biodegradable dispersants. A cement composition of the invention comprises a hydraulic cement, sufficient water to form a slurry and a water soluble biodegradable cement dispersant comprising a polyamide graft copolymer containing at least o e side chain formed from aldehydes and sulfur-containing acids or their salts.
Claims32
A method of cementing a subterranean zone penetrated by a well bore comprising the steps of:
- (a) preparing or providing a cement composition that comprises a hydraulic cement, sufficient water to form a slurry and a water soluble biodegradable cement dispersant comprising a polyamide graft copolymer containing at least one side chain formed from aldehydes and sulfur-containing acids or their salts, said polyamide component of said graft copolylmer being a natural polyamide selected from the group consisting of casein, gelatin, soy protein, polyaspartic acid, collagens, bone binders, blood albumins, and their degradation products;
- (b) placing said cement compositions in said subterranean zone to be cemented;
- and
- (c) allowing said cement composition to set into a solid mass therein.
1 more element
A well cement composition comprising:
- a hydraulic cement;
- sufficient water to form a slurry;
- and
- a water soluble biodegradable cement dispersant comprising a polyamide graft copolymer containing at least one side chain formed from aldehydes and sulfur containing acids or their salts, said polyamide component of said graft copolymer being a natural polyamide selected from the group consisting of casein, gelatin, soy protein, polyaspartic acid, collagens, bone binders, blood albumins, and their degradation products.
1 more element
Dependencies are inferred from the claim text.