Crack-resistant cement composition
First Claim
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1. A method of cementing in a subterranean formation comprising:
- introducing a cement composition into the subterranean formation, wherein the cement composition comprises;
(A) cement;
(B) water; and
(C) an additive comprising zirconium dioxide, wherein at least 60% of the zirconium dioxide is in a metastable tetragonal phase during the step of introducing, and wherein some or all of the zirconium dioxide that is in the metastable tetragonal phase transforms to a stable monoclinic phase after a stress is applied to the cement composition;
allowing or causing to allow the cement composition to set;
allowing or causing to allow the stress to induce a crack in the set cement composition;
wherein the stress further induces at least a portion of the zirconium dioxide that is in the metastable tetragonal phase to transform to the stable monoclinic phase;
wherein this transformation reduces the size of at least one dimension of the crack.
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Abstract
A cement composition for use in a well that penetrates a subterranean formation comprising: cement; water; and an additive comprising zirconium dioxide, wherein at least a portion of the zirconium dioxide is in a metastable tetragonal phase, and wherein some or all of the zirconium dioxide that is in the metastable tetragonal phase transforms to a stable monoclinic phase after a stress is applied to the cement composition. The additive also reduces the dimensions of a crack located within the set cement composition. A method of cementing in a subterranean formation comprising: introducing a cement composition into the subterranean formation.
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Citations
17 Claims
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1. A method of cementing in a subterranean formation comprising:
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introducing a cement composition into the subterranean formation, wherein the cement composition comprises; (A) cement; (B) water; and (C) an additive comprising zirconium dioxide, wherein at least 60% of the zirconium dioxide is in a metastable tetragonal phase during the step of introducing, and wherein some or all of the zirconium dioxide that is in the metastable tetragonal phase transforms to a stable monoclinic phase after a stress is applied to the cement composition; allowing or causing to allow the cement composition to set; allowing or causing to allow the stress to induce a crack in the set cement composition;
wherein the stress further induces at least a portion of the zirconium dioxide that is in the metastable tetragonal phase to transform to the stable monoclinic phase;
wherein this transformation reduces the size of at least one dimension of the crack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification