Organic blend additive useful for inhibiting localized corrosion of equipment used in oil and gas production

Patent metadata

Field	Value
Publication number	US-11608560-B2
Application number	US-202017124708-A
Country	US
Kind code	B2
Filing date	Dec 17, 2020
Priority date	Sep 21, 2018
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

An organic blend chemical additive comprising more than 50 wt. % organic solvent (e.g. methanol and/or ethylene glycol), less than 10 wt. % water, a nitrate salt, a maleic acid copolymer, and optionally an imidazoline may be delivered to a production well through a conduit having a stainless steel and corrosion resistant metal alloy surface, such as a capillary string or an umbilical tubing, the organic blend chemical additive being shown to be useful in inhibiting localized corrosion of and improving the repassivation of the equipment or conduit.

First claim

What is claimed is:

1. An organic chemical blend additive corrosion inhibitor comprising:
a nitrate;
a maleic acid copolymer that is a polycarboxylic acid having the following chemical description: propenoic acid, ethyl ester, polymer with ethenyl acetate and 2,5 furandione, hydrolyzed;
an organic solvent in an amount greater than 50 wt. %, based on a total amount of the organic chemical blend additive; and
less than 10 wt. % water, based on a total amount of the organic chemical blend additive.

2. The organic chemical blend additive corrosion inhibitor of claim 1 where the nitrate is in solution form and present in the organic chemical blend additive in an amount less than 2 wt. %, based on the total amount of the organic chemical blend additive.

3. The organic chemical blend additive corrosion inhibitor of claim 1 where the nitrate is selected from a group consisting of calcium nitrate, sodium nitrate, potassium nitrate, and a combination thereof.

4. The organic chemical blend additive corrosion inhibitor of claim 3 where amount of nitrate present in the blend ranges from about 0.25% of a 45% aqueous solution of nitrate salt to about 5% of a 45% aqueous solution of the nitrate salt.

5. The organic chemical blend additive corrosion inhibitor of claim 1 where the amount of maleic acid copolymer in the organic chemical blend additive ranges from about 1 wt. % to about 15 wt. %.

6. The organic chemical blend additive corrosion inhibitor of claim 1 further comprising an imidazoline.

7. The organic chemical blend additive corrosion inhibitor of claim 6 where the imidazoline has a general formula:

where R is a tall oil fatty acid and where P is selected from a group consisting of (CH 2 —CH 2 )-X, (CH 2 —CH 2 —O) n H, and CH 2 —CH 2 —(NH—CH 2 —CH 2 ) y NH—CO—R1; wherein X is NH 2 , OH, or NH—CO—R2, n is 10, and y is equal to or greater than 2.

8. The organic chemical blend additive corrosion inhibitor of claim 7 where the amount of the imidazoline in the organic chemical blend additive corrosion inhibitor may range from about 5 wt. % independently to about 30 wt. %.

9. An organic chemical blend additive corrosion inhibitor comprising:
a nitrate in solution form and present in the organic chemical blend additive in an amount less than 2 wt. %, based on the total amount of the organic chemical blend additive;
a maleic acid copolymer in an amount from about 1 wt. % to about 15 wt. %, where the maleic acid copolymer is a polycarboxylic acid having the following chemical description: propenoic acid, ethyl ester, polymer with ethenyl acetate and 2,5 furandione, hydrolyzed;
an organic solvent in an amount greater than 50 wt. %, based on a total amount of the organic chemical blend additive; and
less than 10 wt. % water, based on a total amount of the organic chemical blend additive.

10. The organic chemical blend additive corrosion inhibitor of claim 9 where the nitrate is selected from a group consisting of calcium nitrate, sodium nitrate, potassium nitrate, and a combination thereof.

11. The organic chemical blend additive corrosion inhibitor of claim 9 further comprising an imidazoline.

12. The organic chemical blend additive corrosion inhibitor of claim 11 where the amount of the imidazoline in the organic chemical blend additive corrosion inhibitor may range from about 5 wt. % independently to about 30 wt. %.

13. An organic chemical blend additive corrosion inhibitor comprising:
a nitrate selected from a group consisting of calcium nitrate, sodium nitrate, potassium nitrate, and a combination thereof;
a maleic acid copolymer is a polycarboxylic acid having the following chemical description: propenoic acid, ethyl ester, polymer with ethenyl acetate and 2,5 furandione, hydrolyzed;
an organic solvent in an amount greater than 50 wt. %, based on a total amount of the organic chemical blend additive; and
less than 10 wt. % water, based on a total amount of the organic chemical blend additive.

14. The organic chemical blend additive corrosion inhibitor of claim 13 where the nitrate is in solution form and present in the organic chemical blend additive in an amount less than 2 wt. %, based on the total amount of the organic chemical blend additive.

15. The organic chemical blend additive corrosion inhibitor of claim 14 where amount of nitrate present in the blend ranges from about 0.25% of a 45% aqueous solution of nitrate salt to about 5% of a 45% aqueous solution of the nitrate salt.

16. The organic chemical blend additive corrosion inhibitor of claim 13 where the amount of maleic acid copolymer in the organic chemical blend additive ranges from about 1 wt. % to about 15 wt. %.

17. The organic chemical blend additive corrosion inhibitor of claim 13 further comprising an imidazoline.

18. The organic chemical blend additive corrosion inhibitor of claim 17 where the amount of the imidazoline in the organic chemical blend additive corrosion inhibitor may range from about 5 wt. % independently to about 30 wt. %.

Assignees

• Baker Hughes
• Baker Hughes Holdings Llc

Inventors

• Menendez Carlos M

Classifications

• C09K8/54

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

• C23F11/124

  Carboxylic acids · CPC title

• C23F11/173

  Macromolecular compounds · CPC title

• C23F11/181

  Nitrogen containing compounds · CPC title

• C23F11/149 Primary

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title