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US 7,063,738 B2Granted
Permeable cements
AssigneeSchlumberger Technology Corporation
InventorsSamuel Danican, Bruno Drochon, Simon James, Beilin Ding
Life of this patent
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Abstract
A permeable cement composition comprises an aqueous slurry of a hydraulic cement including a water-immiscible dispersed fluid phase, such as oil or gas, and a hollow particulate material, the hollow particulate material being one which breaks down in the presence of the cement so as to leave voids which together with the dispersed phase create a permeable structure in the cement.
Claims19
A permeable set cement obtained by
- a) preparing a slurry including
- i) an aqueous continuous phase;
- ii) a water-immiscible dispersed nitrogen or oil fluid phase, in an amount of from 40%–50% of the total volume of the slurry;
- iii) a blend of solid particles including hydraulic cement particles and hollow particulate material, in an amount of 10%–60% by volume of solid blend
- b) and allowing the cement to set at a temperature such that the hollow particulate material breaks down due to the chemical and thermal environment in the cement, so as to leave voids which together with the dispersed phase result in a set cement having a permeability of at least 1 Darcy.
2 more elements
Dependencies are inferred from the claim text.