Non-reducing stabilization complexant for acidizing compositions and associated methods

Patent metadata

Field	Value
Publication number	US-10190034-B2
Application number	US-201415308937-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Methods for reducing viscosifying tendencies of crude oil in subterranean formations using solid acid chelating agents are described. The methods include combining a solid acid chelating agent and an aqueous acid solution to form a treatment fluid, and introducing the treatment fluid into the subterranean formation. The solid acid chelating agent includes at least one aminopolycarboxylic acid functional group and at least one phosphonic acid functional group.

First claim

What is claimed is:

1. A method of reducing viscosifying tendencies of crude oil in a subterranean formation comprising:
combining an effective amount of a solid acid chelating agent and an aqueous acid solution to form a treatment fluid, wherein the solid acid chelating agent comprises N-phosphonomethyl iminodiacetic acid (PMIDA);
introducing the treatment fluid into the subterranean formation, wherein the subterranean formation has a bottomhole temperature in excess of 350° F.;
contacting the crude oil with the treatment fluid; and
preventing an increase in viscosity of the crude oil.

2. The method of claim 1 , wherein the treatment fluid does not comprise an emulsion.

3. The method of claim 1 , wherein the treatment fluid has a viscosity substantially similar to water.

4. The method of claim 1 , wherein the aqueous acid solution comprises about 15 weight percent hydrochloric acid.

5. The method of claim 1 , wherein the solid acid chelating agent is present in an amount of about 0.5 to about 40 pounds per thousand gallons (PPT) of the treatment fluid.

6. The method of claim 1 , wherein preventing the increase in viscosity of the crude oil is part of an acidizing or scale control operation.

7. The method of claim 1 , wherein the solid acid chelating agent, when ionized, forms a complex with ferric cations.

8. The method of claim 1 , wherein the treatment fluid has a pH of less than about 6.

9. The method of claim 1 , wherein the treatment fluid has a pH of less than about 3.5.

10. The method of claim 1 , wherein the solid acid chelating agent is in solid form when the treatment fluid is introduced into the subterranean formation.

11. The method of claim 1 , wherein the crude oil comprises asphaltenes.

12. The method of claim 1 , wherein the treatment fluid comprises about 5 percent to about 35 percent (w/v) of the solid acid chelating agent.

Assignees

• Halliburton Energy Services Inc

Inventors

• Lablanc Benjamin Edward
• Reyes Enrique Antonio
• Smith Alyssa Lynn
• Beuterbaugh Aaron Michael

Classifications

• C09K8/72

  Eroding chemicals, e.g. acids · CPC title

• C09K8/86

  containing organic compounds · CPC title

• C09K8/524 Primary

  organic depositions, e.g. paraffins or asphaltenes · CPC title

• C09K8/528

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C09K8/56

  Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof (compositions for plastering borehole walls C09K8/50; {Soil-conditioning materials or soil-stabilising materials in general C09K17/00}) · CPC title