Cold set cement composition and method
AssigneeHughes Tool Company
InventorsBenton L. Dibrell, Richard G. Gandy
Life of this patent
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Abstract
A cement composition is shown for use in preparing a pumpable slurry capable of setting and developing compressive strength at low temperatures. The cement composition includes a hydraulic cement, gypsum, calcium chloride and a setting time retarding agent. The cement composition also includes an additive blend comprising sodium metasilicate, lime and hydroxyethyl cellulose. The cement slurries of the invention are prepared by adding mixing water to the dry cement composition in an amount ranging from about 8 to about 13 gallons of water per 89 pounds of dry cement composition.
Claims12
A cement composition made up of dry solids for use in preparing a pumpable slurry capable of setting and developing compressive strength at low temperatures, comprising:
- a hydraulic cement, gypsum, a divalent chloride salt, and a setting time retarding agent;
- and
- an additive blend comprising lime, sodium metasilicate, and hydroxyethyl cellulose.
A process for cementing pipe in a well which penetrates a low temperature earth formation comprising the steps of depositing in the space between said pipe and said formation an aqueous slurry of a cement composition and thereafter allowing said slurry to set, wherein said slurry comprises:
- a hydraulic cement, gypsum, a divalent chloride salt, and a setting time retarding agent;
- an additive blend comprising lime, sodium metasilicate and hydroxyethyl cellulose;
- and
- water in an amount to form a pumpable slurry capable of setting and developing adequate compressive strength at low temperatures.
A process of preparing a pumpable cement slurry for cementing pipe in wells drilled through low temperature earth formations, comprising the steps of:
- mixing together in water a blend of hydraulic cement, gypsum, a divalent chloride salt, a setting time retarding agent, lime, sodium metasilicate and hydroxyethyl cellulose;
- and
- said water being added in an amount to form a pumpable slurry capable of setting and developing compressive strength at low temperatures.
Dependencies are inferred from the claim text.