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Cement compositions having enhanced mechanical properties and comprising microspheres and carbon fibers are provided herein. Methods are provided herein for cementing in a subterranean formation using such cement compositions. The cement compositions comprise a cement material, carbon fibers, micros

Cement compositions having enhanced mechanical properties and comprising microspheres and carbon fibers are provided herein. Methods are provided herein for cementing in a subterranean formation using such cement compositions. The cement compositions comprise a cement material, carbon fibers, microspheres, sufficient water to form a slurry, and optionally other ingredients including an accelerant, a retardant, a surfactant, or the like.

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1. A method of cementing in a subterranean formation comprising the steps of:preparing a cement composition comprising a hydraulic cement, water, microspheres, and carbon fibers, wherein the carbon fibers are present in the cement composition in an amount in the range of from about 1% to about 15% b

1. A method of cementing in a subterranean formation comprising the steps of:preparing a cement composition comprising a hydraulic cement, water, microspheres, and carbon fibers, wherein the carbon fibers are present in the cement composition in an amount in the range of from about 1% to about 15% by weight of cement; placing the cement composition in the subterranean formation; and allowing the cement composition to set therein. 2. The method of claim 1 wherein the hydraulic cement comprises at least one of the following: Portland cements, pozzolana cements, gypsum cements, high alumina content cements, calcium phosphate cements, silica cements and high alkalinity cements.3. The method of claim 1 wherein the carbon fibers have a mean length of about 150 microns.4. The method of claim 1 wherein the cement composition further comprises at least one of the following: a dispersant, a retardant, an accelerant, a surfactant, a fluid loss agent, bentonite, fumed silica, fiber, mica, and a salt.5. The method of claim 1 wherein the cement composition has a tensile strength greater than about 183 psi.6. The method of claim 1 wherein the microspheres are present in the cement composition in an amount in the range of from about 10% to about 390% by weight of cement.7. The method of claim 1 wherein the water is present in the cement composition in an amount in the range of from about 50% to about 350% by weight of cement.8. The method of claim 1 wherein the density of the cement composition is in the range of from about 5 pounds per gallon to about 15 pounds per gallon.9. The method of claim 1 wherein the density of the cement composition is in the range of from about 6 pounds per gallon to about 14 pounds per gallon, wherein the water is present in the cement composition in the range of from about 60% to about 200% by weight of cement, wherein the carbon fibers have a mean length of about 150 microns, and wherein the microspheres are present in the cement composition in an amount in the range of from about 20% to about 100% by weight of cement.10. A method of increasing the tensile strength of a subterranean formation cement composition comprising a hydraulic cement, microspheres and water, comprising the step of adding carbon fibers to the cement composition, wherein the carbon fibers are added to the cement composition in an amount in the range of from about 1% to about 15% by weight of cement.11. The method of claim 10 wherein the cement composition comprises at least one of the following: Portland cements, pozzolana cements, gypsum cements, high alumina content cements, calcium phosphate cements, silica cements and high alkalinity cements.12. The method of claim 10 wherein the carbon fibers have a mean length of about 150 microns.13. The method of claim 10 wherein the cement composition further comprises at least one of the following: a dispersant, a surfactant or mixture of surfactants, a retardant, an accelerant, a fluid loss agent, bentonite, fumed silica, mica, fiber, and a salt.14. The method of claim 10 wherein the cement composition has a tensile strength greater than about 183 psi.15. The method of claim 10 wherein the microspheres are present in the cement composition in an amount in the range of from about 10% to about 390% by weight of cement.16. The method of claim 10 wherein the water is present in the cement composition in an amount in the range of from about 50% to about 350% by weight of cement.17. The method of claim 10 wherein the density of the cement composition is in the range of from about 5 pounds per gallon to about 15 pounds per gallon.18. The method of claim 10 wherein the density of the cement composition is in the range of from about 6 pounds per gallon to about 14 pounds per gallon, wherein the water is present in the cement composition in an amount in the range of from about 60% to about 200% by weight of cement, wherein the carbon fibers have a mean length of about 150 microns, and wherein the microspheres are present in the cement composition in an amount in the range of from about 20% to about 100% by weight of cement.