Agents for enhanced degradation of controlled electrolytic material

Patent metadata

Field	Value
Publication number	US-10059867-B2
Application number	US-201715412162-A
Country	US
Kind code	B2
Filing date	Jan 23, 2017
Priority date	Nov 11, 2011
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A method for degrading a downhole article includes exposing the downhole article comprising a controlled electrolytic material to a composition that comprises a reducing agent. The method also includes contacting the downhole article with the reducing agent to degrade the downhole article. Additionally, a composition for degrading a downhole article includes water, chelant, metal ions, and a reducing agent that includes ascorbic acid, erythorbic acid, a derivative thereof, a salt thereof, or a combination thereof.

First claim

What is claimed is:

1. A downhole maintenance system comprising:
a composition comprising a reducing agent of formula 1

wherein R 1 and R 2 are:
independently a functional group from R 3 ; or
a ring formed by joining R 1 and R 2 , which are independently a group from R 4 ,
wherein R 3 is a functional group selected from hydrogen, hydroxyl, alkyl, alkoxy, fluoroalkyl, cycloalkyl, heterocycloalkyl, cycloalkyloxy, aryl, aralkyl, aryloxy, aralkyloxy, heteroaryl, heteroaralkyl, alkenyl, alkynyl, NH 2 , amine, alkyleneamine, aryleneamine, or alkenyleneamine, and
R 4 is a group selected from a single bond, oxygen (—O—), alkylene, alkyleneoxy, fluoroalkylene, cycloalkylene, heterocycloalkylene, arylene, aralkylene, aryleneoxy, heteroarylene, heteroaralkylene, alkenylene, alkynylene, amide, or any of the foregoing groups substituted by a functional group from R 3 ; and

an additive comprising one or more of the following: a biocide; a breaker; a clay stabilizer; a corrosion inhibitor; a crosslinker; a friction reducer; a gelling agent; an iron control agent; a scale inhibitor; or a surfactant,
wherein the composition is free of acid except for the reducing agent, an acid produced from the reducing agent, or a combination thereof.

2. The downhole maintenance system of claim 1 , wherein the reducing agent is ascorbic acid, erythorbic acid, a derivative thereof, a salt thereof, or a combination thereof.

3. The downhole maintenance system of claim 1 , wherein the additive is one or more of the following: glutaraldehyde; 2,2-dibromo-3-nitrilopropionamide; peroxodisulfate; tetramethylammonium chloride; methanol; potassium hydroxide; sodium acrylate; polyacrylamide; guar gum; ethylene glycol; polyacrylate; or isopropanol.

4. The downhole maintenance system of claim 1 , wherein the system has a viscosity of about 1 centipoise to about 1000 centipoises as measured by a Brookfield viscometer.

5. The downhole maintenance system of claim 1 , wherein the system has a viscosity of about 1 centipoise to about 100 centipoises as measured by a Brookfield viscometer.

6. The downhole maintenance system of claim 1 , wherein the system is effective to remove a metal from a downhole article to degrade the downhole article.

7. The downhole maintenance system of claim 6 , wherein the metal is selected from Group 2, Group 6, Group 7, Group 8, Group 12 of the periodic table, an alloy thereof, or a combination thereof.

8. The downhole maintenance system of claim 6 , wherein the metal is one or more of the following: magnesium; iron; aluminum; nickel; molybdenum; manganese; tungsten; zinc; zirconium; or an alloy thereof.

9. The downhole maintenance system of claim 1 , further comprising metal ions that are one or more of the following: Fe 2+ ; Fe 3+ ; Co 3+ ; Mn 2+ ; Ni 2+ ; Cu + ; Cu 2+ ; Cr 3+ ; Cr 2+ ; or Zn 2+ .

10. The downhole maintenance system of claim 9 , wherein the metal ions are present in the composition from about 0.001 wt. % to about 1 wt. % based on the weight of the composition.

11. The downhole maintenance system of claim 1 , wherein the composition further comprises a brine.

12. The downhole maintenance system of claim 11 , wherein the brine is seawater, produced water, completion brine, or a combination thereof.

13. The downhole maintenance system of claim 11 , wherein a salt is present in the brine in an amount from about 0.5 wt. % to about 50 wt. % based on the weight of the composition.

14. The downhole maintenance system of claim 1 , wherein the reducing agent is present in the composition in an amount from about 0.1 wt. % to about 40 wt. %, based on the weight of the composition.

15. The downhole maintenance system of claim 1 , wherein the reducing agent is present in the composition in an amount from about 0.2 wt. % to about 30 wt. %, based on the weight of the composition.

16. The downhole maintenance system of claim 1 , further comprising a salt of an aminocarboxylic acid.

17. The downhole maintenance system of claim 16 , wherein the salt is one or more of the following: Na 4 EDTA; (NH 4 )H 2 EDTA; Na 3 NTA; Na 3 HEDTA; or K 5 DTPA.

18. The downhole maintenance system of claim 1 , wherein the additive is one or more of the following: glutaraldehyde; 2,2-dibromo-3-nitrilopropionamide; peroxodisulfate; tetramethylammonium chloride; potassium hydroxide; sodium acrylate; polyacrylamide; guar gum; polyacrylate; or isopropanol.

Assignees

• Crews James B
• Baker Hughes A Ge Co Llc

Inventors

• Crews James B

Classifications

• C09K2208/26

  Gel breakers other than bacteria or enzymes · CPC title

• C09K2208/28

  Friction or drag reducing additives · CPC title

• E21B29/00 Primary

  Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground · CPC title

• C09K8/00 Primary

  Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title