Method for designing low portland liquid cement with long shelf life

Patent metadata

Field	Value
Publication number	US-11447425-B2
Application number	US-202016923864-A
Country	US
Kind code	B2
Filing date	Jul 8, 2020
Priority date	Jul 8, 2020
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A method may include: defining engineering parameter of a proposed cement slurry, the engineering parameters comprising at least a compressive strength requirement, a density requirement, a storage time requirement, and a thickening time requirement; selecting, based at least in part on a model of compressive strength, a model of storage time, and the density requirement, at least a cement and mass fraction thereof, at least one supplementary cementitious material and mass fraction thereof, and a water and mass fraction thereof, such that a cement slurry formed from the cement, the at least one supplementary cementitious material, and the water meets the compressive strength requirement and the density requirement; selecting, based at least in part on a model of thickening time, an accelerator and mass fraction thereof; selecting, based at least in part on a model of activator thickening time, an activator and mass fraction thereof; and preparing a cement slurry comprising the cement and mass fraction thereof, the at least one supplementary cementitious material and mass fraction thereof, the water and mass fraction thereof, and the cement retarder and mass fraction thereof.

First claim

What is claimed is:

1. A method of preparing a cement comprising:
(a) defining engineering parameters of a proposed cement slurry, wherein the engineering parameters comprise at least a density requirement, a compressive strength requirement, and a storage time requirement;
(b) selecting at least a cement and mass fraction thereof, at least one supplementary cementitious material and mass fraction thereof, and a water and mass fraction thereof, such that a cement slurry formed from the cement, the at least one supplementary cementitious material, and the water meet or exceed the density requirement;
(c) calculating a compressive strength of the cement slurry;
(d) comparing the compressive strength of the cement slurry to the compressive strength requirement and repeating steps (b)-(d) if the compressive strength does not meet or exceed the compressive strength requirement, or performing step(e) if the compressive strength meets or exceeds the required compressive strength;
(e) selecting a cement retarder and mass fraction thereof based at least in part on a thickening time model, the storage time requirement, an estimated daily high temperature, and an estimated daily low temperature; and
(f) preparing the cement slurry comprising the cement and mass fraction thereof, the at least one supplementary cementitious material and mass fraction thereof, the water and mass fraction thereof, and the cement retarder and mass fraction thereof.

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.

4. The method of claim 1 wherein the engineering parameters further comprise wellbore temperature, a lime to silica ratio requirement, and wherein the step of selecting a cement and mass fraction thereof and at least one supplementary cementitious material and mass fraction thereof comprises:
selecting a first cement based at least in part on the wellbore temperature and a cement reactivity trend, wherein the cement reactivity trend comprises a correlation of cement reactivity with temperature;
selecting at least a first supplementary cementitious material based at least in part on wellbore temperature, supplementary cementitious material reactivity, temperature sensitivity of reactivity, and water requirement of supplementary cementitious material; and
calculating a silica content and a lime content for each of the first cement and the at least the first supplementary cementitious material and determining an additional amount of lime required to meet the lime to silica ratio requirement.

5. The method of claim 1 wherein the engineering parameters further comprise temperature, and wherein the thickening time model comprises the following integral equation:

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Assignees

• Halliburton Energy Services Inc

Inventors

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

Classifications

• E21B33/13

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B40/0032

  Controlling the process of mixing, e.g. adding ingredients in a quantity depending on a measured or desired value (B28C7/00 takes precedence) · CPC title

• C04B28/14

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

• C04B28/04 Primary

  Portland cements · CPC title