Methods and systems for iron control using a phosphinated carboxylic acid polymer

Patent metadata

Field	Value
Publication number	US-9890320-B2
Application number	US-201314366105-A
Country	US
Kind code	B2
Filing date	Aug 20, 2013
Priority date	Aug 20, 2013
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

The presence of iron in a subterranean formation, particularly ferric iron, can be problematic during an acidizing operation due to sludge formation that can occur. Methods for treating a subterranean formation in the presence of iron can comprise: providing a treatment fluid comprising an acid and an iron stabilization agent comprising a phosphinated carboxylic acid polymer, the treatment fluid having a pH of about 3 or below and the phosphinated carboxylic acid polymer being soluble in the treatment fluid; introducing the treatment fluid into a subterranean formation; and interacting the phosphinated carboxylic acid polymer with ferric iron in the subterranean formation.

First claim

The invention claimed is:

1. A method comprising:
providing a treatment fluid comprising an acid and an iron stabilization agent comprising a sulfonated phosphinated carboxylic acid polymer, the treatment fluid having a pH of about 3 or below and the sulfonated phosphinated carboxylic acid polymer being soluble in the treatment fluid, wherein the sulfonated phosphinated carboxylic acid polymer is a phosphino copolymer of acrylic acid and sulfonic acid;
introducing the treatment fluid into a subterranean formation; and
interacting the sulfonated phosphinated carboxylic acid polymer with dissolved ferric iron in the subterranean formation without forming a ferric iron precipitate,
wherein a concentration of the sulfonated phosphinated carboxylic acid polymer in the treatment fluid ranges between 3% to 5% of the treatment fluid by weight.

2. The method of claim 1 , wherein the acid comprises a mineral acid.

3. The method of claim 2 , wherein the treatment fluid contains about 15% to about 28% hydrochloric acid by volume.

4. The method of claim 1 , further comprising:
reacting a carbonate material in the subterranean formation with a component of the treatment fluid.

5. The method of claim 1 , wherein the treatment fluid further comprises a chelating agent selected from the group consisting of methylglycine diacetic acid, glutamic acid diacetic acid, β-alanine diacetic acid, ethylenediaminedisuccinic acid, any salt thereof, and any combination thereof.

6. The method of claim 5 , further comprising:
reacting the chelating agent with the dissolved ferric iron, a carbonate material, or any combination thereof.

7. The method of claim 1 , wherein interacting the sulfonated phosphinated carboxylic acid polymer with the dissolved ferric iron comprises decreasing an incidence of iron-containing sludge within the subterranean formation.

8. The method of claim 7 , wherein the subterranean formation also contains a sludge-forming component that forms a sludge in the presence of dissolved ferric iron, the sludge-forming component comprising a substance selected from the group consisting of an asphaltene, a maltene, a porphyrin, and any combination thereof.

9. The method of claim 7 , further comprising:
inhibiting the formation of a scale in the subterranean formation with the sulfonated phosphinated carboxylic acid polymer, the scale comprising a divalent metal ion scale.

10. A method comprising:
providing a treatment fluid comprising an acid and an iron stabilization agent comprising a sulfonated phosphinated carboxylic acid polymer, the treatment fluid having a pH of about 3 or below and the sulfonated phosphinated carboxylic acid polymer being soluble in the treatment fluid, wherein the sulfonated phosphinated carboxylic acid polymer is a phosphino copolymer of acrylic acid and sulfonic acid;
introducing the treatment fluid into a subterranean formation containing a carbonate material;
reacting the carbonate material in the subterranean formation with a component of the treatment fluid; and
interacting the sulfonated phosphinated carboxylic acid polymer with dissolved ferric iron in the subterranean formation, so as to decrease an incidence of iron-containing sludge within the subterranean formation;
wherein the sulfonated phosphinated carboxylic acid polymer interacts with the dissolved ferric iron without forming a ferric iron precipitate, and
wherein a concentration of the sulfonated phosphinated carboxylic acid polymer in the treatment fluid ranges between 3% to 5% of the treatment fluid by weight.

11. The method of claim 10 , wherein the acid comprises a mineral acid.

12. The method of claim 11 , wherein the treatment fluid contains about 15% to about 28% hydrochloric acid by volume.

13. The method of claim 10 , wherein the subterranean formation also contains a sludge-forming component that forms a sludge in the presence of dissolved ferric iron, the sludge-forming component comprising a substance selected from the group consisting of an asphaltene, a maltene, a porphyrin, and any combination thereof.

14. The method of claim 10 , wherein the treatment fluid further comprises a chelating agent selected from the group consisting of methylglycine diacetic acid, glutamic acid diacetic acid, β-alanine diacetic acid, ethylenediaminedisuccinic acid, any salt thereof, and any combination thereof.

15. The method of claim 14 , further comprising:
reacting the chelating agent with the dissolved ferric iron, the carbonate material, or any combination thereof.

16. The method of claim 10 , further comprising:
inhibiting the formation of a scale in the subterranean formation with the sulfonated phosphinated carboxylic acid polymer, the scale comprising a divalent metal ion scale.

Assignees

• Halliburton Energy Services Inc

Inventors

• Reyes Enrique Antonio
• Beuterbaugh Aaron Michael
• Smith Alyssa Lynn
• Smith Christopher Lynn

Classifications

• C09K8/74 Primary

  combined with additives added for specific purposes · CPC title

• E21B43/27

  by use of eroding chemicals, e.g. acids · CPC title

• C09K8/52 Primary

  Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning · CPC title

• E21B37/06

  using chemical means for preventing or limiting {, e.g. eliminating,} the deposition of paraffins or like substances · CPC title

• E21B43/26

  by forming crevices or fractures · CPC title