Settable compositions comprising wollastonite and pumice and methods of use
Methods and compositions are provided that relate to cementing operations, including a method of cementing that may comprise providing a settable composition that may comprise wollastonite, pumice, a calcium-ion source, and water, wherein the wollastonite may be present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice, and wherein the pumice may present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice. Embodiments of the method further may comprise allowing the settable composition to set.
1. A settable composition comprising:
wollastonite;
pumice;
a calcium-ion source in an amount in a range of from about 0.1% to about 25% by combined weight of the wollastonite and pumice; and
water in an amount sufficient to form a pumpable slurry and present in a range of from about 40% to about 200% by combined weight of the wollastonite and pumice;
wherein the wollastonite is present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice; and
wherein the pumice is present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice, and
wherein the settable composition is free of an additional cementitious components or comprises the additional cementitious components in an amount of about 1% or less by combined weight of the wollastonite and pumice.
2. The composition of claim 1 , wherein the settable composition has a density in a range of from about 12 pounds per gallon to about 20 pounds per gallon.
3. The composition of claim 1 , wherein the water is present in an amount in a range of from about 40% to about 150% by combined weight of the wollastonite and pumice.
4. The composition of claim 1 , wherein the calcium-ion source comprises lime.
5. The composition of claim 1 , wherein the calcium-ion source is present in an amount in a range of from about 1% to about 10% by combined weight of the wollastonite and pumice.
6. The composition of claim 1 , wherein the settable composition further comprises an additive selected from the group consisting of a dispersant, a strength-retrogression additive, a set accelerator, a set retarder, a weighting agent, a lightweight additive, a gas-generating additive, a mechanical property enhancing additive, a lost-circulation material, a filtration-control additive, a fluid loss control additive, a foaming additive, a defoaming additive, a thixotropic additive, and any combination thereof.
7. The composition of claim 1 , wherein the settable composition further comprises an additive selected from the group consisting of crystalline silica, amorphous silica, fumed silica, salts, fibers, hydratable clays, calcined shale, vitrified shale, microspheres, fly ash, diatomaceous earth, metakaolin, ground perlite, rice husk ash, natural pozzolan, zeolite, cement kiln dust, resins, any combination thereof.
8. The composition of claim 1 , wherein the settable composition is free of Portland cement.
9. The composition of claim 1 , wherein the wollastonite has a mean particle size of about 1 micron to about 200 microns.
10. The composition of claim 1 , wherein the pumice has a mean particle size of about 1 micron to about 50 microns.
11. A settable composition comprising:
a cementitious component, wherein the cementitious comprises wollastonite and pumice;
lime; and
water;
wherein the settable composition is free of any additional cementitious components or comprises the additional cementitious components in an amount about 1% or less by weight of the cementitious component.
12. The composition of claim 11 , wherein the lime is present in the settable composition in an amount in a range of from about 0.1% to about 25% by combined weight of the wollastonite and pumice.
13. The composition of claim 11 , wherein the settable composition has a density in a range of from about 12 pounds per gallon to about 20 pounds per gallon.
14. The composition of claim 11 , wherein the settable composition further comprises an additive selected from the group consisting of a dispersant, a strength-retrogression additive, a set accelerator, a set retarder, a weighting agent, a lightweight additive, a gas-generating additive, a mechanical property enhancing additive, a lost-circulation material, a filtration-control additive, a fluid loss control additive, a foaming additive, a defoaming additive, a thixotropic additive, and any combination thereof.
15. The composition of claim 11 , wherein the settable composition further comprises an additive selected from the group consisting of crystalline silica, amorphous silica, fumed silica, salts, fibers, hydratable clays, calcined shale, vitrified shale, microspheres, fly ash, diatomaceous earth, metakaolin, ground perlite, rice husk ash, natural pozzolan, zeolite, cement kiln dust, resins, any combination thereof.
16. The composition of claim 11 , wherein the water is present in an amount in a range of from about 40% to about 200% by combined weight of the wollastonite and pumice.
17. The composition of claim 11 , wherein the wollastonite is present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice; and wherein the pumice is present in an amount in a range from about 25% to about 75% by combined weight of the wollastonite and pumice.
18. The composition of claim 11 , wherein the wollastonite has a mean particle size of about 1 micron to about 200 microns.
19. The composition of claim 11 , wherein the pumice has a mean particle size of about 1 micron to about 50 microns.
20. The composition of claim 1 , wherein the calcium-ion source is calcium oxide, calcium hydroxide, or a combination thereof.