Back to results
US 6,729,405 B2Granted
High temperature flexible cementing compositions and methods for using same
AssigneeBJ Services Company
InventorsGino A. DiLullo, Philip J. Rae
Life of this patent
Estimating the term…
Abstract
Natural fiber-containing cement compositions for cementing wellbores in high stress and high temperature environments. The cement compositions may contain natural mineral fiber materials such as wollastonite in an amount of greater than about 10% and in an amount selected to be effective to achieve ratios of flexural strength to compressive strength of cured cement that are greater than about 0.35 at downhole temperatures of greater than about 180° F.
Claims19
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising a hydraulic cement base and a natural mineral fiber into said wellbore;
- and
- allowing said cement slurry to cure within said wellbore to form a hardened cement composition within said wellbore;
- wherein a temperature of at least a first portion of said well bore is greater than about 180° F.;
- wherein said natural mineral fiber is present in said cement slurry in an amount greater than about 10% by weight of cement, and is also present in said cement slurry in an amount selected to be effective to result in at least a portion of said cured cement composition having a ratio of flexural strength to compressive strength that is greater than or equal to about 0.35 at said temperature of said at least a first portion of said well bore that is greater than about 180° F.;
- and
- wherein said natural mineral fiber comprises at least one calcium silicate natural mineral fiber.
4 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising a hydraulic cement base and wollastonite into said wellbore;
- and
- allowing said cement slurry to cure within said wellbore to form a hardened cement composition within said wellbore;
- wherein a temperature of at least a first portion of said well bore is greater than about 180° F.;
- wherein said wollastonite is present in said cement slurry in an amount greater than about 10% by weight of cement, and is also present in said cement slurry in an amount selected to be effective to result in at least a portion of said cured cement composition having a ratio of flexural strength to compressive strength that is greater than or equal to about 0.35 at said temperature of said at least a first portion of said well bore that is greater than about 180° F.
2 more elements
Dependencies are inferred from the claim text.