Methods and systems for protecting acid-reactive substances

Patent metadata

Field	Value
Publication number	US-9809716-B2
Application number	US-201514889150-A
Country	US
Kind code	B2
Filing date	Jan 14, 2015
Priority date	Jan 14, 2015
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Inadvertent or unavoidable contact of an acid with an acid-reactive substance may preclude the acid's use in another location where its reactivity is more desired. Excessive reactivity of acids toward acid-reactive substances may lead to undesired effects such as surface erosion, matrix deconsolidation, scaling, and the like. Methods for protecting an acid-reactive surface from excessive reaction may comprise: depositing a protective coating comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface; and contacting a mineral acid or an organic acid with the protective coating without substantially reacting the acid-reactive surface.

First claim

The invention claimed is:

1. A method comprising:
depositing a protective coating comprising an
N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface comprising an acid-reactive substance selected from the group consisting of a metal, a metal salt, a mineral, a carbonate mineral, and an acid-degradable polymer; and
contacting a mineral acid or an organic acid with the protective coating without substantially reacting the acid-reactive surface where the protective coating is present for a time period when the pH of the mineral acid or organic acid in contact with the protective coating is about 3 or lower.

2. The method of claim 1 , wherein the protective coating is deposited onto the acid-reactive surface before the mineral acid or the organic acid is contacted with the acid-reactive surface.

3. The method of claim 1 , wherein the mineral acid or the organic acid comprises an acid selected from the group consisting of hydrochloric acid, hydrobromic acid, methanesulfonic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, formic acid, acetic acid, and any combination thereof.

4. The method of claim 1 , wherein the acid-reactive surface is present in a wellbore penetrating a subterranean formation.

5. The method of claim 4 , wherein the acid-reactive surface comprises a matrix comprising the subterranean formation, at least a portion of a particulate pack, or at least a portion of a metal tool that is present in the wellbore.

6. The method of claim 5 , wherein the matrix comprises a mineral selected from the group consisting of calcite, dolomite, and any combination thereof.

7. The method of claim 4 , wherein the protective coating diverts the mineral acid or the organic acid from a first location in the wellbore where the protective coating is deposited to a second location in the wellbore.

8. The method of claim 1 , wherein the protective coating is deposited from a gelled fluid comprising the N-(phosphonoalkyl)iminodiacetic acid or any salt thereof.

9. The method of claim 1 , wherein the protective coating is deposited from a fluid phase comprising a suspension of the N-(phosphonoalkyl)iminodiacetic acid or any salt thereof.

10. The method of claim 1 , further comprising:
removing the protective coating from the acid-reactive surface by contacting the protective coating with an aqueous fluid having a pH of about 5 or greater.

11. The method of claim 1 , wherein the N-(phosphonoalkyl)iminodiacetic acid has a structure of

wherein n is an integer ranging between 1 and about 20.

12. The method of claim 11 , wherein the N-(phosphonoalkyl)iminodiacetic acid comprises N-(phosphonomethyl)iminodiacetic acid.

13. A method comprising:
introducing a treatment fluid comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof into a wellbore penetrating a subterranean formation;
depositing a protective coating comprising the N-(phosphonoalkyl)iminodiacetic acid or any salt thereof onto an acid-reactive surface in the wellbore;
wherein the acid-reactive surface comprises an acid-reactive substance selected from the group consisting of a metal, a metal salt, a mineral, a carbonate mineral, and an acid-degradable polymer;

contacting a mineral acid or an organic acid with the protective coating without etching substantially reacting the acid-reactive surface where the protective coating is present for a time period when the pH of the mineral acid or organic acid in contact with the protective coating is about 3 or lower; and
diverting the mineral acid or the organic acid from a first location in the wellbore where the protective coating is deposited to a second location in the wellbore.

14. The method of claim 13 , further comprising:
reacting the mineral acid or the organic acid with an acid-reactive substance at the second location.

15. The method of claim 13 , wherein the acid-reactive surface comprises a matrix comprising the subterranean formation, at least a portion of a particulate pack, or at least a portion of a metal tool that is present in the wellbore.

16. The method of claim 15 , wherein the matrix comprises a mineral selected from the group consisting of calcite, dolomite, and any combination thereof.

17. The method of claim 13 , wherein the subterranean formation comprises a carbonate mineral.

18. The method of claim 13 , wherein the N-(phosphonoalkyl)iminodiacetic acid or any salt thereof is suspended in the treatment fluid.

19. The method of claim 13 , wherein the mineral acid or the organic acid comprises an acid selected from the group consisting of hydrochloric acid, hydrobromic acid, methanesulfonic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, formic acid, acetic acid, and any combination thereof.

20. The method of claim 13 , further comprising:
removing the protective coating from the acid-reactive surface by contacting the protective coating with an aqueous fluid having a pH of about 5 or greater.

21. The method of claim 13 , wherein the mineral acid or the organic acid is introduced into the wellbore after depositing the protective coating.

22. The method of claim 13 , wherein a concentration of the N-(phosphonoalkyl)iminodiacetic acid or any salt thereof in the treatment fluid ranges between about 1.5 wt. % and about 15 wt. %.

23. The method of claim 13 , wherein the N-(phosphonoalkyl)iminodiacetic acid has a structure of

wherein n is an integer ranging between 1 and about 20.

24. The method of claim 23 , wherein the N-(phosphonoalkyl)iminodiacetic acid comprises N-(phosphonomethyl)iminodiacetic acid.

Assignees

• Halliburton Energy Services Inc

Inventors

• Beuterbaugh Aaron Michael
• Reyes Enrique Antonio
• Lablanc Alyssa Lynn

Classifications

• C09K8/03 Primary

  Specific additives for general use in well-drilling compositions · CPC title

• C09K8/74

  combined with additives added for specific purposes · CPC title

• C09K8/54

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title

• E21B43/25

  Methods for stimulating production {(by vibrating earth formations E21B43/003)} · CPC title

• C09D5/086 Primary

  Organic or non-macromolecular compounds · CPC title