Carbon dioxide-resistant Portland based cement composition
AssigneeHalliburton Energy Services, Inc.
InventorsAshok K. Santra, David Kulakofsky
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Abstract
The invention provides a carbon dioxide-resistant hydraulic cement composition. The inventive composition comprises a Portland cement, Class C fly ash and water. The Class C fly ash is present in the composition in an amount in the range of from about 5% to less than about 30% by weight based on the total weight of the cementitious components in the composition. In another aspect, the invention provides a method of cementing in a carbon dioxide environment. In yet another aspect, the invention provides a method of enhancing the recovery of a hydrocarbon fluid from a subterranean formation.
Claims11
A method of cementing in a carbon dioxide environment, comprising:
- preparing a carbon dioxide-resistant hydraulic cement composition, said carbon dioxide-resistant hydraulic cement composition including:
- a Portland cement;
- Class C fly ash present in an amount in a range of from 5% to less than 30% by weight based on the total weight the cementitious components in said composition;
- and
- water present in an amount sufficient to form a slurry;
- placing said carbon dioxide-resistant hydraulic cement composition in said carbon dioxide environment;
- and
- allowing said carbon dioxide-resistant hydraulic cement composition to set.
A method of enhancing the recovery of a hydrocarbon from a subterranean formation, comprising:
- placing one or more injection wells into said subterranean formation, said injection well including a casing cemented into place using a hydraulic cement composition;
- placing one or more production wells into said subterranean formation, said production well(s) including a casing cemented into place using a hydraulic cement composition;
- injecting a flooding composition including carbon dioxide and water through one or more of said injection wells into said subterranean formation in order to pressurize said subterranean formation and drive said hydrocarbon toward said production well(s), wherein said hydraulic cement composition utilized to cement the casing into place in at least one of said injection well(s) and said production well(s) is a carbon dioxide corrosion-resistant hydraulic cement composition that includes:
- a Portland cement;
- Class C fly ash present in an amount in a range of from 5% to less than 30% by weight based on the total weight the cementitious components in said composition;
- and
- water present in an amount sufficient to form a slurry.
Dependencies are inferred from the claim text.