Methods of cementing subterranean zones
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Roger S. Cromwell, Bobby J. King, Dennis W. Gray, Darrell C. Brenneis
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Abstract
Improved methods of cementing in a subterranean zone penetrated by a well bore are provided. The methods are basically comprised of the steps of preparing a foamed cement composition comprised of hydraulic cement, a non-dispersing set retarder, sufficient water to form a slurry, sufficient gas to foam the slurry and a foaming and foam stabilizing surfactant mixture present in an amount sufficient to facilitate the formation of the foam and stabilize the foamed cement composition.
Claims21
An improved method of cementing in a subterranean zone penetrated by a well bore comprising the steps of:
- (a) preparing a foamed cement composition comprised of hydraulic cement, a non-dispersing set retarder comprised of a mixture of lignosulfonate, sugar acid and sulfonated lignin, sufficient water to form a slurry, sufficient gas to foam said slurry and a foaming and foam stabilizing surfactant mixture present in an amount sufficient to facilitate the formation of said foam and stabilize said foamed cement composition;
- (b) placing said foamed cement composition into said subterranean zone;
- and
- (c) allowing said foamed cement composition to set into a solid mass therein.
An improved method of cementing in a subterranean zone penetrated by a well bore comprising the steps of:
- (a) preparing a foamed cement composition comprised of Portland cement, a non-dispersing set retarder comprised of a mixture of about 59 parts by weight hardwood lignosulfonate, about 11 parts by weight xylose sugar acid and about 30 parts by weight sulfonated kraft lignin, sufficient water to foam a slurry, sufficient nitrogen gas to foam said slurry and a foaming and foam stabilizing surfactant mixture present in an amount sufficient to facilitate the formation of said foam and stabilize said foamed cement composition;
- (b) placing said foamed cement composition into said subterranean zone;
- and
- (c) allowing said foamed cement composition to set into a solid mass therein.
Dependencies are inferred from the claim text.