Sulfide stress cracking inhibitors

Patent metadata

Field	Value
Publication number	US-9587157-B2
Application number	US-201414777580-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Jul 30, 2014
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

The invention provides a method, composition, and system for inhibiting sulfide stress cracking of metal that is exposed to aqueous sulfide and aqueous acid, and optionally brine, where the composition comprises a thietane compound, a thiirane compound, or a combination thereof.

First claim

We claim:

1. A method of inhibiting sulfide stress cracking of metal in a subterranean formation, the method comprising contacting a metal with a composition comprising a compound of formula I:

a compound of formula II:

or a combination thereof, wherein
each of R 1 -R 10 is independently selected from the group consisting of H and an optionally substituted C 1 -C 10 hydrocarbyl group; and
the metal is exposed to an aqueous sulfide and an aqueous acid.

2. The method according to claim 1 , wherein the sulfide is present as hydrogen sulfide.

3. The method according to claim 2 , wherein the composition comprises a thiirane of formula I, wherein each of R 1 -R 4 is H.

4. The method according to claim 1 , wherein the composition comprises the aqueous acid.

5. The method according to claim 1 , wherein the metal is additionally exposed to an aqueous brine.

6. The method according to claim 1 , wherein the contacting occurs before the metal is exposed to the aqueous sulfide and the aqueous acid.

7. The method according to claim 1 , wherein the contacting occurs at least partially simultaneously with the exposure of the metal to the aqueous acid.

8. The method according to claim 7 , wherein the contacting occurs before the metal is exposed to the aqueous sulfide.

9. The method according to claim 1 , wherein the metal is exposed to the aqueous sulfide and the aqueous acid in a subterranean formation.

10. The method according to claim 1 , wherein the aqueous acid is selected from the group consisting of mineral acids, carboxylic acids, hydroxyl carboxylic acids, amino carboxylic acids, and combinations thereof.

11. The method according to claim 10 , wherein the acid is a mineral acid is selected from the group consisting of hydrochloric acid, hydrofluoric acid, and combinations thereof.

12. The method according to claim 10 , wherein the acid is a carboxylic acid selected from the group consisting of acetic acid, formic acid, and combinations thereof.

13. The method according to claim 10 , wherein the acid is a hydroxyl carboxylic acid selected from the group consisting of citric acid, lactic acid, glycolic acid, 3-hydroxypropionic acid, carbonic acid, and combinations thereof.

14. The method according to claim 10 , wherein the acid is a hydroxyl carboxylic acid selected from the group consisting of ethylenediamine tetracetic acid, glutamic acid diacetic acid, methylglycine diacetic acid, and combinations thereof.

15. The method according to claim 1 , wherein the aqueous acid is present in an amount of about 1% to about 40% (w/w).

16. The method according to claim 15 , wherein the aqueous acid is present in an amount of about 5% to about 20% (w/w).

17. The method according to claim 16 , wherein the aqueous acid is present in an amount of about 15% (w/w).

18. The method according to claim 1 , wherein
the sulfide is present as hydrogen sulfide downhole in an oilfield;
the composition comprises a compound of formula I, wherein each of R 1 -R 4 is H;
the composition comprises the aqueous acid; and
the contacting occurs simultaneously with the exposure of the metal to the aqueous acid,
and before the metal is exposed to the aqueous sulfide.

Assignees

• Halliburton Energy Services Inc

Inventors

• Chen Gong
• Cassidy Juanita
• Lane Jim L

Classifications

• C09K8/035 Primary

  Organic additives · CPC title

• E21B17/00

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• C09K8/54

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

• C09K2208/32

  Anticorrosion additives · CPC title

• C09K2208/22

  Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers · CPC title