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US 2004/0221990 A1Published application
Methods and compositions for compensating for cement hydration volume reduction
OwnerJames F. Heathman, Krishna M. Raviinventors
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Abstract
A method and cementing composition that includes gas generating additives for compensating for or offsetting hydration volume shrinkage of the cementing compositions. The method comprises placing the cementing composition in a subterranean zone and allowing the cement composition to set into a solid mass therein.
Claims62
A method of cementing a subterranean zone, comprising:
- preparing a cement slurry;
- preparing a liquid composition comprising an active gas generating additive selected from the group consisting of aluminum powder and azodicarbonamide, wherein the active gas generating additive is coated or encapsulated with a surfactant and the surfactant is a fatty acid ester of sorbitan, glycerol or pentaerythritol;
- pumping the cement slurry into the subterranean zone;
- injecting the liquid composition into the cement slurry to form a cementing composition as the cement slurry is being pumped into the subterranean zone;
- and
- allowing the cementing composition to set in the subterranean zone.
3 more elements
A method of cementing a subterranean zone, comprising:
- preparing a cement slurry;
- preparing a liquid composition comprising from about 0.3 to about 5.0 percent of an active gas generating additive by weight of the cement wherein the active gas generating additive is selected from the group consisting of aluminum powder and azodicarbonamide;
- pumping the cement slurry into the subterranean zone;
- injecting the liquid composition into the cement slurry to form a cementing composition as the cement slurry is being pumped into the subterranean zone;
- and
- allowing the cementing composition to set in the subterranean zone.
3 more elements
A method of cementing a subterranean zone, comprising:
- preparing a cement slurry;
- preparing a liquid composition comprising greater than about 2.0 percent of an active gas generating additive by weight of the cement wherein the active gas generating additive is selected from the group consisting of aluminum powder and azodicarbonamide;
- pumping the cement slurry into the subterranean zone;
- injecting the liquid composition into the cement slurry to form a cementing composition as the cement slurry is being pumped into the subterranean zone;
- and
- allowing the cementing composition to set in the subterranean zone.
3 more elements
A cementing composition comprising:
- cement and a liquid composition comprising an active gas generating additive selected from the group consisting of aluminum powder and azodicarbonamide, wherein the active gas generating additive is coated or encapsulated with a surfactant and the surfactant is a fatty acid ester of sorbitan, glycerol or pentaerythritol.
A cementing composition comprising:
- cement and a liquid composition comprising from about 0.3 to about 5.0 percent of an active gas generating additive by weight of the cement wherein the active gas generating additive is selected from the group consisting of aluminum powder and azodicarbonamide.
A cementing composition comprising:
- cement and a liquid composition comprising greater than about 2.0 percent of an active gas generating additive by weight of the cement wherein the active gas generating additive is selected from the group consisting of aluminum powder and azodicarbonamide.
Dependencies are inferred from the claim text.