Method to cement a wellbore in the presence of carbon dioxide
AssigneeShell Oil Company
InventorsKenneth M. Cowan, James J. W. Nahm, Arthur H. Hale
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Abstract
The present invention is a method to cement a wellbore in the presence of carbon dioxide, or when the wellbore will subsequently be exposed to carbon dioxide. The wellbore is cemented using a blast furnace slag cement slurry, and the resulting set cement is considerably less susceptible to degradation by carbon dioxide.
Claims18
A method to cement a portion of a wellbore in the presence of carbon dioxide comprising the steps of:
- providing granulated water-quenched a blast furnace slag based cement slurry;
- placing granulated water-quenched the blast furnace slag based slurry in the portion of the wellbore to be cemented in the presence of carbon dioxide;
- and
- allowing the granulated water-quenched blast furnace slag based cement to harden.
The method of claim I further comprising the step of drilling the portion of the wellbore using a drilling fluid comprising a cementitious material.
A method to cement a portion of a wellbore in the presence of carbon dioxide comprising the steps of:
- providing granulated water-quenched a blast furnace slag based cement slurry;
- placing the granulated water-quenched blast furnace slag based slurry in the portion of the wellbore to be cemented;
- allowing the granulated water-quenched blast furnace slag based cement to harden;
- and
- exposing the set cement to carbon dioxide.
Dependencies are inferred from the claim text.