Emulsion shear bond enhanced cement

Patent metadata

Field	Value
Publication number	US-11739247-B1
Application number	US-202217650804-A
Country	US
Kind code	B1
Filing date	Feb 11, 2022
Priority date	Feb 11, 2022
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A precursor cement slurry includes a cement powder, water, and an additive. The additive includes a cement bond enhancer and a non-aqueous fluid additive. The non-aqueous fluid additive is an internal phase and the cement bond enhancer stabilizes the non-aqueous fluid additive in the form of a Pickering emulsion within the precursor cement slurry. The cement bond enhancer is comprised of the reaction product of graphene oxide with an anchoring functionality. A method of forming the precursor cement slurry and a method of cementing an annular space within a wellbore are also provided.

First claim

What is claimed:

1. A precursor cement slurry, comprising:
a cement powder;
water; and
an additive, where the additive includes a cement bond enhancer and a non-aqueous fluid additive;
where the non-aqueous fluid additive is an internal phase and the cement bond enhancer stabilizes the non-aqueous fluid additive in the form of a Pickering emulsion within the precursor cement slurry, and where the cement bond enhancer is comprised of the reaction product of graphene oxide with an anchoring functionality.

2. The precursor cement slurry of claim 1 where the additive further comprises a polymer.

3. The precursor cement slurry of claim 1 where the additive further comprises a superplasticizer.

4. The precursor cement slurry of claim 1 where the non-aqueous fluid additive comprises a hydrocarbon solvent.

5. The precursor cement slurry of claim 1 where the cement powder comprises Saudi Class G Portland Cement.

6. The precursor cement slurry of claim 1 , wherein the cement bond enhancer is mono-facial.

7. The precursor cement slurry of claim 1 , wherein the cement bond enhancer is bi-facial.

8. The precursor cement slurry of claim 1 , wherein the cement bond enhancer is a reaction product of graphene oxide and (3-aminopropyl)triethoxysilane.

9. The precursor cement slurry of claim 1 , wherein the cement bond enhancer is a reaction product of graphene oxide and (3-glycidyloxypropyl)trimethoxysilane.

10. A method of forming a precursor cement slurry, comprising:
introducing into a cement powder a dry additive that is not a cement bond enhancer such that a dry mixture forms;
introducing a water-soluble fluid additive and the cement bond enhancer into a water such that a wet suspension forms, where the cement bond enhancer is comprised of the reaction product of graphene oxide with an anchoring functionality;
introducing a non-aqueous fluid additive into the wet suspension such that a Pickering emulsion forms, where the non-aqueous fluid additive is an internal phase and the cement bond enhancer stabilizes the non-aqueous fluid additive and; and
introducing the dry mixture into the Pickering emulsion such that the precursor cement slurry forms.

11. The method of claim 10 where the dry additive that is not a cement bond enhancer includes a polymer.

12. The method of claim 10 where the water-soluble additive that is liquid includes a superplasticizer.

13. The method of claim 10 , wherein the cement bond enhancer is mono-facial.

14. The method of claim 10 , wherein the cement bond enhancer is bi-facial.

15. The method of claim 10 , wherein the cement bond enhancer is a reaction product of graphene oxide and (3-aminopropyl)triethoxysilane.

16. The method of claim 10 , wherein the cement bond enhancer is a reaction product of graphene oxide and (3-glycidyloxypropyl)trimethoxysilane.

17. A method for cementing an annular space within a wellbore: comprising:
introducing a precursor cement slurry into the wellbore such that it is positioned in the annular space in the wellbore; and
maintaining the wellbore such that the precursor cement slurry cures into a product cement in the annular space,
where the precursor cement slurry comprises:
a cement powder;
water; and
an additive, where the additive includes a cement bond enhancer and a hydrocarbon solvent;
where the hydrocarbon solvent is an internal phase and the cement bond enhancer stabilizes the hydrocarbon solvent in the form of a Pickering emulsion within the precursor cement slurry and where the cement bond enhancer is comprised of the reaction product of graphene oxide with an anchoring functionality.

18. The method of claim 17 where the precursor cement slurry is positioned in the annular space formed between a wellbore wall and a casing.

19. The method of claim 17 where the precursor cement slurry is positioned in the annular space formed between a first casing and a second casing.

20. The method of claim 17 where the precursor cement slurry is positioned in the annular space formed between a production tube and a casing.

21. The method of claim 17 , wherein the cement bond enhancer is mono-facial.

22. The method of claim 17 , wherein the cement bond enhancer is bi-facial.

23. The method of claim 17 , wherein the cement bond enhancer is a reaction product of graphene oxide and (3-aminopropyl)triethoxysilane.

24. The method of claim 17 , wherein the cement bond enhancer is a reaction product of graphene oxide and (3-glycidyloxypropyl)trimethoxysilane.

Assignees

• Aramco Services Co
• Saudi Arabian Oil Co

Inventors

• Boul Peter

Classifications

• E21B33/14

  for cementing casings into boreholes · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B24/425

  Organo-modified inorganic compounds, e.g. organo-clays · CPC title

• C04B40/0046

  characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures · CPC title