Method to design for thickening time using cementitious blend composition

Patent metadata

Field	Value
Publication number	US-11629103-B2
Application number	US-202016923797-A
Country	US
Kind code	B2
Filing date	Jul 8, 2020
Priority date	Jul 8, 2020
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A method of designing a cement slurry may include: (a) selecting at least a cement and concentration thereof, water and concentration thereof, and, optionally, at least one supplementary cementitious material and a concentration thereof, such that a cement slurry comprising the cement, the water, and, if present, the at least one supplementary cementitious material, meet a density requirement; (b) calculating a thickening time of the cement slurry using a thickening time model; (c) comparing the thickening time of the cement slurry to a thickening time requirement, wherein steps (a)-(c) are repeated if the thickening time of the cement slurry does not meet or exceed the thickening time requirement, wherein the selecting comprises selecting different concentrations and/or different chemical identities for the cement and/or the supplementary cementitious material than previously selected, or step (d) is performed if the thickening time of the cement slurry meets or exceeds the thickening time requirement; and preparing the cement slurry.

First claim

What is claimed is:

1. A method of designing a cement slurry comprising:
(a) selecting at least a cement and concentration thereof, water and concentration thereof, and, optionally, at least one supplementary cementitious material and a concentration thereof, such that a cement slurry comprising the cement, the water, and, if present, the at least one supplementary cementitious material, meet a density requirement;
(b) calculating a thickening time of the cement slurry using a thickening time model, wherein the thickening time model includes a model element of sensitivity to change in water amount in the cement slurry, wherein the model element of sensitivity to change in water amount in the cement slurry comprises an exponential term, a power law term, and/or a polynomial term relating the effect of water content of the cement slurry to thickening time;
(c) comparing the thickening time of the cement slurry to a thickening time requirement, wherein steps (a)-(c) are repeated if the thickening time of the cement slurry does not meet or exceed the thickening time requirement, wherein each repeated step of selecting comprises selecting different concentrations and/or different chemical identities for the cement and/or the supplementary cementitious material than previously selected, or step (d) is performed if the thickening time of the cement slurry meets or exceeds the thickening time requirement; and
(d) preparing the cement slurry.

2. The method of claim 1 wherein the cement is selected from the group consisting of Portland cements, pozzolana cements, gypsum cements, high alumina content cements, silica cements, and combinations thereof.

3. The method of claim 1 wherein the at least one supplementary cementitious material is selected from the group consisting of fly ash, blast furnace slag, silica fume, pozzolans, kiln dust, clays, and combinations thereof, and optionally, wherein the cement slurry further comprises at least one inert material.

4. The method of claim 1 wherein the thickening time model comprises the following equation:

TT
=

TT
0

(

water
blend

)

n

⁢

∑
i

x
i

⁢

β
i

where TT is the thickening time, TT 0 is characteristic thickening time at a reference temperature, water and blend are the mass fraction of the water and blend in the cement slurry, where blend is the cement and the at least one supplementary cementitious material, if present, xi is a mass fraction of component i in the blend, β i is a reactivity of component i, and n is a measurement of sensitivity to change in water amount.

5. The method of claim 1 wherein the thickening time model comprises the following equation:

TT
=

T
⁢

T
0

⁡

(

water
blend

)

n

⁢

(

∑
i

⁢

x
i

⁢

β
i

)

+

(

∑
i

⁢

∑
j

⁢

x
i

⁢

x
j

⁢

β

i
⁢
j

)

+
…

where TT is the thickening time, TT 0 is characteristic thickening time at a reference temperature, water is the mass of the water, blend is the mass of the cement and the at least one supplementary cementitious material, if present, in the cement slurry, n is a measurement of sensitivity to change in water amount, x i is mass fraction of component i, x i is mass fraction of component j, β i is a model parameter which characterizes reactivity of component i, and β ij is a model parameter which characterizes interaction between component i and j.

6. The method of claim 1 wherein the thickening time model comprises the following equation:

TT
=

T
⁢

T
0

⁡

(

water
blend

)

n

⁢

e

∑
i

⁢

x
i

⁢

β
i

where TT is the thickening time, TT 0 is characteristic thickening time at a reference temperature, water is the mass fraction of the water, blend is the mass fraction of the cement and the at least one supplementary cementitious materi

Assignees

• Halliburton Energy Services Inc

Inventors

• Jandhyala Siva Rama Krishna
• Singh John Paul Bir
• Pisklak Thomas Jason

Classifications

• C04B28/04 Primary

  Portland cements · CPC title

• C04B2103/44

  Thickening, gelling or viscosity increasing agents · CPC title

• C04B7/26

  from raw materials containing flue dust {, i.e. fly ash (C04B7/243 takes precedence)} · CPC title

• C04B28/24

  containing alkyl, ammonium or metal silicates; containing silica sols {(reaction mixtures resulting in mineral polymers C04B28/006; polymeric reaction products of alkali metal silicates with isocyanates C08G18/3895)} · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title