Accelerated cement compositions and methods for top-job cementing of a wellbore to reduce corrosion

Patent metadata

Field	Value
Publication number	US-11485894-B2
Application number	US-202016995069-A
Country	US
Kind code	B2
Filing date	Aug 17, 2020
Priority date	Aug 17, 2020
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

A method of reducing corrosion in tubular strings installed in wellbores includes dispensing an accelerated cement composition into a wellbore annulus, a casing-casing annulus, or both, the accelerated cement composition comprising a cement composition and an accelerant composition, where: the cement composition comprises a cement precursor and water; the accelerant composition comprises triethanolamine; and a concentration of the triethanolamine in the accelerated cement composition is greater than or equal to 10,000 parts per million by weight; allowing the accelerated cement composition to cure in the annulus to form a cured cement, where the triethanolamine reacts with a metal of the tubular string, the reaction forming a protective layer on the surfaces of the tubular string that inhibits dissolution of iron from the metal of the tubular string.

First claim

What is claimed is:

1. A method for reducing corrosion in tubular strings installed in wellbores, the method comprising:
dispensing an accelerated cement composition into a wellbore annulus, a casing-casing annulus, or both, the accelerated cement composition comprising a cement composition and an accelerant composition, where:
the cement composition comprises water and from 10 weight percent (wt. %) to 70 wt. % API Class G cement;
the accelerant composition comprises triethanolamine; and
a concentration of the triethanolamine in the accelerated cement composition is greater than or equal to 10,000 parts per million by weight; and

allowing the accelerated cement composition to cure in the annulus to form a cured cement, where the triethanolamine reacts with a metal of the tubular string, the reaction forming a protective layer on the surfaces of the tubular string that inhibits dissolution of iron from the metal of the tubular string.

2. The method of claim 1 , further comprising:
preparing the cement composition; and
adding the accelerant composition to the cement composition to produce the accelerated cement composition.

3. The method of claim 1 , in which dispensing the accelerated cement composition into the annulus comprises pumping the accelerated cement composition directly into a top opening of the wellbore annulus or casing-casing annulus so that the accelerated cement composition flows downward into the wellbore annulus, the casing-casing annulus, or both.

4. The method of claim 1 , in which:
the cement composition comprises
from 5 wt. % to 70 wt. % water based on the total weight of the cement composition, and

the accelerated cement composition comprises from 0.1 percent (%) to 60% by weight of cement triethanolamine.

5. The method of claim 1 , in which the accelerant composition includes:
from 5 wt. % to 10 wt. % triethanolamine based on the total weight of the accelerant composition; and
from 10 wt. % to 30 wt. % aluminum sulphate based on the total weight of the accelerant composition.

6. The method of claim 1 , in which the cement composition includes from 10% to 150% by weight of cement weighting agent comprising hematite, hausmanite, or both.

7. A method for reducing corrosion in tubular strings installed in wellbores, the method comprising:
injecting a cement composition into a wellbore annulus, a casing-casing annulus, or both, for primary cementing, where primary cementing results in incomplete cementing of the wellbore annulus, the casing-casing annulus, or both;
injecting an accelerated cement composition into a top opening of the wellbore annulus, the casing-casing annulus, or both, the accelerated cement composition comprising the cement composition and an accelerant composition, where:
the cement composition comprises water and from 10 weight percent to 70 weight percent API Class G cement;
the accelerant composition comprises triethanolamine; and
a concentration of the triethanolamine in the accelerated cement composition is greater than or equal to 10,000 parts per million by weight; and

allowing the accelerated cement composition to cure in the annulus to form a cured cement, where the triethanolamine reacts with a metal of the tubular string, the reaction forming a protective layer on the surfaces of the tubular string that inhibits dissolution of iron from the metal of the tubular string.

8. The method of claim 7 , further comprising:
preparing the cement composition; and
adding the accelerant composition to the cement composition to produce the accelerated cement composition.

9. The method of claim 7 , further comprising pumping a first cement composition into the center of the tubular string and pumping a displacement fluid into the wellbore to force a first cement composition into the wellbore annulus.

10. The method of claim 7 , further comprising identifying a lost circulation zone encountered during cementing, wherein the lost circulation zone is characterized by loss of a first cement composition to the lost circulation zone, preventing the first cement composition from filling the entire wellbore annulus.

11. The method of claim 7 , in which dispensing the accelerated cement composition into the annulus comprises pumping the accelerated cement composition directly into a top opening of the wellbore annulus or casing-casing annulus so that the accelerated cement composition flows downward into the wellbore annulus, the casing-casing annulus, or both.

12. The method of claim 7 , in which:
the cement composition comprises
from 5 wt. % to 70 wt. % water based on the total weight of the cement composition, and

the accelerated cement composition comprises from 0.1 percent (%) to 60% by weight of cement triethanolamine.

13. The method of claim 7 , in which the accelerant composition includes:
from 5 wt. % to 10 wt. % triethanolamine based on the total weight of the accelerant composition; and
from 10 wt. % to 30 wt. % aluminum sulphate based on the total weight of the accelerant composition.

14. The method of claim 7 , in which the cement composition includes from 10% to 150% by weight of cement weighting agent comprising hematite, hausmanite, or both.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alkhalaf Sara A
• Al-Yami Abdullah S
• Wagle Vikrant
• Al-Harthi Mohammad Abdullah

Classifications

• C04B40/0039

  Premixtures of ingredients · CPC title

• C04B28/04

  Portland cements · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B22/148

  Aluminium-sulfate · CPC title

• C04B24/122

  Hydroxy amines · CPC title