Cement composition and its relation with compressive strength

Patent metadata

Field	Value
Publication number	US-12241333-B2
Application number	US-201916632462-A
Country	US
Kind code	B2
Filing date	Apr 5, 2019
Priority date	Apr 5, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

A method for designing a cement composition may include: providing a target compressive strength and a target composition density; selecting at least one cementitious material from a plurality of cementitious materials; calculating a required amount of water to produce a cement composition with the target composition density, the cement composition comprising the water and the at least one cementitious material; calculating a compressive strength of the cement composition based at least in part on a model of compressive strength; comparing the calculated compressive strength to the target compressive strength; and preparing the cement composition with the calculated compressive strength.

First claim

What is claimed is:

1. A method for designing a cement composition comprising:
providing a target compressive strength and a target composition density;
selecting at least one cementitious material from a plurality of cementitious materials;
calculating a required amount of water to produce a cement composition with the target composition density, the cement composition comprising the water and the at least one cementitious material;
calculating a compressive strength of the cement composition based at least in part on a model of compressive strength wherein the model of compressive strength includes a component of reactivity index for each cementitious material in the cement composition;
comparing the calculated compressive strength to the target compressive strength; and
preparing the cement composition with the calculated compressive strength.

2. The method of claim 1 further comprising:
adjusting a concentration of the at least one cementitious material in the cement composition after the step of comparing; and
recalculating the compressive strength of the cement composition.

3. The method of claim 2 wherein the step of adjusting comprises at least one of:
i. increasing a concentration of at least one cementitious material with a relatively higher reactivity index as compared to other cementitious materials if the calculated compressive strength is lower than the target compressive strength,
ii. increasing a concentration of at least one cementitious material with a relatively lower specific gravity as compared to other cementitious materials if the calculated compressive strength is lower than the target compressive strength,
iii. increasing a concentration of at least one cementitious material with a relatively lower reactivity index as compared to other cementitious materials if the calculated compressive strength is greater than the target compressive strength, or
iv. increasing a concentration of at least one cementitious material with a relatively higher specific gravity as compared to other cementitious materials if the calculated compressive strength is greater than the target compressive strength.

4. The method of claim 1 wherein the model of compressive strength comprises at least one correlation between compressive strength and concentration of cementitious material.

5. The method of claim 1 wherein the model of compressive strength comprises a model with the form of:

ln
⁡

(
CS
)

=

ln
⁡

(
A
)

-

1.5
*

ln
⁡

(
B
)

*

1
-

ρ
S

ρ
D

ρ
S

ρ
W

-
1

where CS is compressive strength, A and B are constants dependent on concentrations of cementitious materials in the cement composition calculated by a regression model, ρ s is density of the cement composition,

d is density of a dry blend comprising the cementitious materials, and ρ w is a density of water.

6. The method of claim 1 wherein the model of compressive strength comprises a model with the form of:
where:

CS
=

CS
0

⁡

(

w

c
eff

)

n

where
⁢

:

⁢

⁢

c
eff

=

c
cement

+

Σ
⁢

⁢

α
i

⁢

c
i

and where c cement is the mass fraction of Portland cement in a dry blend comprising the cementitious materials, α i is a reactivity index of component i in a dry blend comprising the cementitious materials, c i is the mass fraction of cementitious component i in the dry blend, w/c eff is water-to-cement ratio, CS is compressive strength, CS 0 is a compressive strength of a Portland cement composition where a water to cement ratio is 1, and n is a constant.

7. The method of claim 6 wherein the reactivity index is calculated based at least in part on a correlation comprising constants, wherein the correlation has the general form of:
reactivity index=Π f (p i )

where p i is a measurable physicochemical property of the cementitious component.

8. The method of claim 1 wherein the model of compressive strength comprises a model with the form of:
CS=ΣCS i ;
where CS i is a compressive strength contribution of component I in a dry blend comprising the cementitious materials.

9. A system comprising:
a predictive model database comprising at least one model of compressive strength for a plurality of cementitious materials wherein the model of compressive strength includes a component of reactivity index for each cementitious material; and
a computer system configured to:
accept an input of compressive strength and composition density;
query the predictive model database and select a model;
generate a cement composition, based at least in part on the selected model, compressive strength, and composition density; and
display the cement composition to a user.

10. The system of claim 9 wherein the at least one model of compressive strength correlates concentration of cementitious material to compressiv

Assignees

• Halliburton Energy Services Inc

Inventors

• Singh John Paul Bir
• Pang Xueyu
• Yerubandi Krishna Babu
• Pisklak Thomas Jason
• Morgan Ronnie Glen
• Jandhyala Siva Rama Krishna

Classifications

• C09K8/42 Primary

  Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells (compositions for plastering C09K8/50) · CPC title

• C04B2201/52

  High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC] · CPC title

• C04B7/02

  Portland cement · CPC title

• C04B2201/50

  for the mechanical strength · CPC title

• C04B2201/20

  for the density · CPC title