Methods for determining reactive index for cementitious components, associated compositions, and methods of use

Patent metadata

Field	Value
Publication number	US-10294154-B2
Application number	US-201514657060-A
Country	US
Kind code	B2
Filing date	Mar 13, 2015
Priority date	Oct 26, 2012
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A variety of methods and compositions are disclosed, including, in one embodiment, a settable composition comprising: water; and a cementitious component having a calculated reactive index.

First claim

What is claimed is:

1. A method of wellbore cementing, the method comprising:
determining a target value of a parameter of a blended cementitious component, the blended cementitious component comprising a first cementitious component and a second cementitious component, wherein the parameter is compressive strength, Young's Modulus, fluid loss, thickening time, volume average apparent viscosity, plastic viscosity, yield point, or free water, and wherein the target value of the parameter is determined by a wellbore design specification;
calculating a reactive index for the first cementitious component;
calculating a reactive index for the second cementitious component;
calculating a mass fraction for the first cementitious component and a mass fraction for the second cementitious component based on the reactive index such that a measured value of the parameter of the blended cementitious component is greater than or equal to the target value of the parameter; and
preparing the blended cementitious component by blending the first cementitious component and the second cementitious according to the calculated mass fraction;
preparing a settable composition comprising the blended cementitious component and water;
introducing the settable composition into the wellbore annulus.

2. The method of claim 1 further comprising adjusting the particle size of at least one of the cementitious component to adjust the calculated reactive index of the cementitious component.

3. The method of claim 2 wherein the adjusting comprises grinding the cementitious component.

4. The method of claim 2 wherein the adjusting comprises reducing the particle size of the cementitious component to a mean particle of about 15 microns or less.

5. 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, and wherein the water is present in an amount sufficient to form a pumpable slurry, and wherein the cementitious components comprise at least one component selected from the group consisting of Portland cement, calcium aluminate, gypsum, a pozzolanic material, kiln dust, and any combination thereof.

6. The method of claim 1 wherein the first cementitious component and the second cementitious component have different reactive indexes.

7. The method of claim 6 wherein the first cementitious component and the second cementitious component have reactive indexes that vary by a factor of at least about 2:1.

8. The method of claim 1 wherein the blended cementitious component comprises a set of n cementitious components, wherein n is an integer, wherein the set of cementitious components comprises the cementitious components, and wherein the step of calculating a mass fraction uses the following equation:

EP
blend

=

∑

i
=
1

n

⁢

⁢

(

RI
i

)

⁢

(

SSA
i

)

⁢

(

f
i

)

m

wherein EP blend is the target value of the parameter for the blended cementitious component, i is an individual cementitious component from the set of cementitious components 1 to n, 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.

9. The method of claim 1 wherein the reactive index for each cementitious component is calculated using at least the following equation:
RI=MP/SSA
wherein RI is the reactive index, MP is a measured parameter of the cementitious component, and SSA is the specific surface area of the cementitious component.

10. A method of preparing a settable composition comprising:
determining a target value of a parameter of a blended cementitious component wherein the parameter is compressive strength, Young's Modulus, fluid loss, thickening time, volume average apparent viscosity, plastic viscosity, yield point, or free water, wherein the blended cementitious component comprises Portland cement, a first cement kiln dust, and a second cement kiln dust and wherein the target value of the parameter is determined by a wellbore design specification;
calculating a reactive index of the Portland cement, the first cement kiln dust, and the second cement kiln dust;
calculating a mass fraction for the Portland cement, the first cement kiln dust, and the second cement kiln dust, based on the reactive index, such that a measured value of the parameter of the blended cementitious component is greater than or equal to the target value of the parameter;
preparing the blended cementitious component by blending the Portland cement, the first cement kiln dust, and the second cement kiln dust according to the calculated mass fraction;
preparing a settable composition comprising the blended cementitious component and water;
introducing the settable composition into the wellbore annulus.

11. The method of claim 10 further comprising adjusting a particle size of at least one of the first cement kiln dust or the second cement kiln dust to adjust the calculated reactive index.

12. The method of claim 11 wherein the adjusting comprises grinding.

13. The method of claim 10 wherein the settable composition has a density in a range of about 4 pounds per gallon to about 20 pounds per gallon, and wherein the water is present in an amount sufficient to form a pumpable slurry.

14. The method of claim 10 wherein the settable composition comprises a blended cementitious component comprising a set of n cementitious components, wherein n is an integer, wherein the set of cementitious components comprises the cementitious components, and wherein the step of calculating a mass fraction uses the following equation:

CS
blend

=

∑

i
=
1

n

⁢

⁢

(

RI
i

)

⁢

(

SSA
i

)

Assignees

• Halliburton Energy Services Inc

Inventors

• Morgan Ronnie G
• Brenneis D Chad
• Roddy Craig W

Classifications

• G01N33/388

  Ceramics · CPC title

• A61P35/00

  Antineoplastic agents · CPC title

• C09K8/428

  for squeeze cementing, e.g. for repairing · CPC title

• C04B28/021

  Ash cements, e.g. fly ash cements (fly ash as filler C04B18/08); Cements based on incineration residues, e.g. alkali-activated slags from waste incineration (alkali-activated combustion residues as such C04B7/243; mixtures of the lime-pozzuolane type C04B28/18); Kiln dust cements · CPC title

• C04B28/14

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title