Methods for determining reactive index for cementitious components, associated compositions, and methods of use
A variety of methods and compositions are included, without limitation, a method of cementing includes providing a settable composition comprising water and a cementitious component having a determined reactive index; and allowing the settable composition to set to form a hardened mass.
1. A method of cementing comprising:
providing a settable composition comprising water and a cementitious component having a determined reactive index; wherein the particle size of the cementitious component has been adjusted to adjust the determined reactive index; and
allowing the settable composition to set to form a hardened mass.
2. The method of claim 1 wherein the settable composition has a density in a range of about 4 pounds per gallon to about 20 pounds per gallon.
3. The method of claim 1 wherein the water is present in an amount sufficient to form a pumpable slurry.
4. The method of claim 1 wherein the cementitious component comprises at least one component selected from the group consisting of Portland cement, calcium aluminate, gypsum, a pozzolanic material, kiln dust, and any combination thereof.
5. The method of claim 1 wherein the settable composition further comprises a second cementitious component, wherein the cementitious component and the second cementitious component have different reactive indexes.
6. The method of claim 5 wherein the cementitious component and the second cementitious component have reactive indexes that vary by a factor of at least about 2:1.
7. The method of claim 5 wherein the cementitious component and the second cementitious component have reactive indexes that vary by a factor of at least about 100:1.
8. A method of cementing comprising:
providing a settable composition comprising water and a cementitious component having a determined reactive index; wherein the particle size of the cementitious component has been reduced by way of grinding to adjust the determined reactive index; and
allowing the settable composition to set to form a hardened mass.
9. A method of cementing comprising:
providing a settable composition comprising water and a cementitious component having a determined reactive index; wherein the determined reactive index is a measured parameter of the cementitious component divided by the specific surface area of the cementitious component; and
allowing the settable composition to set to form a hardened mass.
10. The method of claim 9 wherein the measured parameter is compressive strength, Young's modulus, fluid loss, thickening time, a rheological value, free water, or any combination thereof.
11. The method of claim 1 wherein the settable composition comprises a blended cementitious component, the blended cementitious component comprising the cementitious component.
12. The method of claim 11 further comprising estimating performance of the settable composition using the following equation:
EP
blend
=
∑
i
=
1
n
(
RI
i
)
(
SSA
i
)
(
f
i
)
m
wherein EP blend is an estimated parameter for the blended cementitious component, i is the individual cementitious component from a set of cementitious components 1 to n, n is an integer, RI i is the reactive index for cementitious component i, SSA i is the specific surface area for cementitious component i, f i is the mass fraction of the cementitious component i, and m is a value from 1 to 10.
13. The method of claim 1 further comprising placing the settable composition into a subterranean formation penetrated by a well bore.
14. The method of claim 13 wherein settable composition is used in primary cementing in the well bore.
15. The method of claim 13 wherein the settable composition is used remedial cementing in the well bore.
16. A method of measuring reactivity of a cementitious component comprising:
measuring a parameter of the cementitious component, the cementitious component having a specific surface area; and
dividing the measured parameter by the specific surface area of the cementitious component to obtain a reactive index for the cementitious component.
17. The method of claim 16 further comprising preparing a settable composition comprising the cementitious component, and using the reactive index to adjust an amount of the cementitious component in the settable composition.
18. The method of claim 16 wherein the measured parameter is compressive strength, Young's modulus, fluid loss, thickening time, a rheological value, free water, or any combination thereof.
19. The method of claim 9 wherein the cementitious component comprises at least one component selected from the group consisting of Portland cement, calcium aluminate, gypsum, a pozzolanic material, kiln dust, and any combination thereof.
20. The method of claim 9 wherein the settable composition further comprises a second cementitious component, wherein the cementitious component and the second cementitious component have different reactive indexes.
21. The method of claim 20 wherein the cementitious component and the second cementitious component have reactive indexes that vary by a factor of at least about 2:1.
22. The method of claim 20 wherein the cementitious component and the second cementitious component have reactive indexes that vary by a factor of at least about 100:1.
23. The method of claim 9 wherein the settable composition comprises a blended cementitious component, the blended cementitious component comprising the cementitious component.
24. The method of claim 23 further comprising estimating performance of the settable composition using the following equation:
EP
blend
=
∑
i
=
1
n
(
RI
i
)
(
SSA
i
)
(
f
i
)
m
wherein EP blend is an estimated parameter for the blended cementitious component, i is the individual cementitious component from a set of cementitious components 1 to n, n is an integer, RI i is the reactive index for cementitious component i, SSA i is the specific surface area for cementitious component i, f i is the mass fraction of the cementitious component i, and m is a value from 1 to 10.