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US 6,405,801 B1Granted
Environmentally acceptable well cement fluid loss control additives, compositions and methods
AssigneesHalliburton Energy Services, Inc., Hercules Incorporated
InventorsJan Pieter Vijn, Bach Dao, Mohand Melbouci
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Abstract
Environmentally acceptable well cement fluid loss control additives, cement compositions including the additives and methods of using the compositions are provided. The environmentally acceptable fluid loss control additives are comprised of ethoxylated hydroxyethylcellulose having a reduced molecular weight.
Claims9
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 an environmentally acceptable fluid loss control additive comprised of hydroxyethylcellulose having a reduced molecular weight in the range of from about 30,000 to about 90,000 ethoxylated in an amount in the range of from about 1 to about 4 moles of ethylene oxide per anhydroglucose unit;
- (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.