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Cement compositions with improved mechanical properties and associated methods are provided, which are useful in conjunction with subterranean well operations. In certain embodiments, the cement compositions comprise carbon fibers, rubber particles, a hydraulic cement material, sufficient water to f

Cement compositions with improved mechanical properties and associated methods are provided, which are useful in conjunction with subterranean well operations. In certain embodiments, the cement compositions comprise carbon fibers, rubber particles, a hydraulic cement material, sufficient water to form a pumpable slurry, and optionally other ingredients including a dispersant, a weighting agent, a retarding or accelerating agent, or the like.

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What is claimed is: 1. A well bore cement composition for use in a subterranean formation comprising: a hydraulic cement; water; rubber particles; and carbon fibers, the carbon fibers having a mean length of about 100 microns to about 500 microns. 2. The well bore cement composition of claim 1 w

What is claimed is: 1. A well bore cement composition for use in a subterranean formation comprising: a hydraulic cement; water; rubber particles; and carbon fibers, the carbon fibers having a mean length of about 100 microns to about 500 microns. 2. The well bore cement composition of claim 1 wherein the cement composition has a tensile strength greater than 60 psi. 3. The well bore cement composition of claim 1 wherein the carbon fibers are present in an amount of about 1% to about 15% by weight of a cement component of the cement composition. 4. The well bore cement composition of claim 1 wherein the rubber particles have a mean length of about �� inch or less. 5. The well bore cement composition of claim 1 wherein the rubber particles are present in an amount of about 5% to about 50% by weight of a cement component of the cement composition. 6. The well bore cement composition of claim 1 wherein the hydraulic cement is a Portland cement, a pozzolana cements, a gypsum cement, a high alumina content cement, a silica cement, a high alkalinity cement, a calcium phosphate cements, or a mixture thereof. 7. The well bore cement composition of claim 1 further comprising an additive wherein the additive is a dispersant, a fluid loss agent, weighting materials, an accelerant, a retardant, or a mixture thereof. 8. The well bore cement composition of claim 1 wherein the cement composition has a tensile strength greater than 60 psi. 9. A well bore cement composition for use in a subterranean formation comprising: a hydraulic cement; water; rubber particles wherein the rubber particles have a mean length of about �� inch or less; and carbon fibers, the carbon fibers having a mean length of about 100 microns to about 500 microns. 10. The well bore cement composition of claim 9 wherein the rubber particles are present in an amount of about 5% to about 50% by weight of a cement component of the cement composition. 11. The well bore cement composition of claim 9 wherein the cement composition has a tensile strength greater than 60 psi. 12. A well bore cement composition for use in a subterranean formation comprising: a hydraulic cement wherein the hydraulic cement is a calcium phosphate cement; water; rubber particles; and carbon fibers, the carbon fibers having a mean length of about 100 microns to about 500 microns. 13. The well bore cement composition of claim 12 wherein the carbon fibers have a mean length of about 100 microns to about 200 microns. 14. The well bore cement composition of claim 12 wherein the carbon fibers are present in an amount of about 1% to about 15% by weight of a cement component of the cement composition. 15. The well bore cement composition of claim 12 wherein the rubber particles are present in an amount of about 5% to about 50% by weight of a cement component of the cement composition. 16. The well bore cement composition of claim 12 wherein the cement composition has a tensile strength greater than 60 psi.