Enhanced electrolytic degradation of controlled electrolytic material

Patent metadata

Field	Value
Publication number	US-9938451-B2
Application number	US-201514862310-A
Country	US
Kind code	B2
Filing date	Sep 23, 2015
Priority date	Nov 8, 2011
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A method for degrading a downhole article includes exposing the downhole article to a composition comprising a corrosive agent selected from an ester, aminocarboxylic acid, or a combination thereof. The method also includes contacting the downhole article with the corrosive agent to degrade the downhole article. Additionally, a composition for degrading a downhole article includes water, salt, and a corrosive agent selected from a reducing sugar, ester, aminocarboxylic acid, or a combination thereof.

First claim

What is claimed is:

1. A method for degrading a downhole article, comprising:
exposing the downhole article to a composition comprising a corrosive agent selected from an ester or a combination of the ester with an aminocarboxylic acid, the downhole article comprising a magnesium alloy, the magnesium alloy comprising magnesium alloyed with one or more of the following: cadmium; silver; zinc; copper; cobalt; iron; nickel; strontium; or manganese;
hydrolyzing the ester to an organic acid;
adjusting, with the organic acid, the pH of the borehole proximate to the downhole article to a pH of about 4 to about 8; and
contacting the downhole article with the organic acid to degrade the downhole article,
wherein the composition is substantially free of acids other than the organic acid.

2. The method of claim 1 , wherein degrading the downhole article comprises reducing magnesium in the downhole article by the corrosive agent or a product of the corrosive agent.

3. The method of claim 2 , wherein the corrosive agent is the ester.

4. The method of claim 1 ,
further comprising oxidizing the organic acid.

5. The method of claim 4 , wherein the ester is a C2 to C32 ester.

6. The method of claim 5 , wherein the C2 to C32 ester is selected from methyl formate, methyl trichloroacetate, methyl dichloroacetate, methyl chloroacetate, methyl acetate, ethyl formate, dimethyl carbonate, vinyl acetate, methyl acrylate, propylene carbonate, dimethyl oxalate, 2-bromoethyl acetate, ethyl chloroacetate, methyl 2-chloroacetate, ethyl acetate, isopropyl formate, methyl propanoate, propyl formate, ethyl acrylate, methyl methacrylate, vinyl propanoate, dimethyl malonate, methyl 4-chlorobutyrate, butyl formate, ethyl propanoate, isopropyl acetate, methyl butyrate, methyl isobutyrate, 2-methylpropyl formate, propyl acetate, diethyl carbonate, 2-methoxyethyl acetate, 2-ethoxyethyl acetate, dimethyl maleate, 1-methyl-2 propenyl acetate, ethyl acetoacetate, diethyl oxalate, dimethyl succinate, 1,1-ethanediol diacetate, 1,2-ethanediol diacetate, butyl acetate, sec-butyl acetate, tert-butyl acetate, ethyl butyrate, ethyl isobutyrate, isobutyl acetate, isopentyl formate, methyl trimethylacetate, methyl valerate, pentyl formate, propyl propanoate, 2-ethoxyethanol acetate, butyl propanoate, ethyl isovalerate, ethyl 2-methylbutyrate, ethyl trimethylacetate, ethyl valerate, formic acid hexyl ester, isobutyl propanoate, isopentyl acetate, isopropyl butyrate, 1-methylbutyl acetate, methyl hexanoate, pentyl acetate, propyl butyrate, butyl lactate, 3-methoxybutyl acetate, benzyl formate, methyl benzoate, phenyl acetate, methyl salicylate, diethyl maleate, butyl methacrylate, cyclohexyl acetate, isobutyl methacrylate, 2,3-butanediol diacetate, diethyl methylmalonate, diethyl succinate, dimethyl adipate, butyl butyrate, butyl isobutyrate, ethylbutyl acetate, ethyl hexanoate, heptyl formate, 2-hexanol acetate, hexyl acetate, sec-hexyl acetate, isobutyl isobutyrate, isopentyl propanoate, methyl heptanoate, pentyl propanoate, benzyl acetate, ethyl benzoate, ethyl salicylate, 1,2,3-propanetriol triacetate, cyclohexyl propionate, diethyl glutarate, butyl valerate, ethyl heptylate, heptyl acetate, hexyl propanoate, isopentyl butanoate, methyl caprylate, octyl formate, pentyl butyrate, methyl dibutylphosphinate, dibutyl methylphosphonate, triethylcitrate, dimethyl phthalate, cyclohexyl butyrate, diethyl adipate, ethylene glycol dibutyrate, ethyl caprylate, 2-ethylhexyl acetate, hexyl butyrate, hexyl isobutyrate, nonyl formate, methyl nonanoate, octyl acetate, butoxyethoxyethyl acetate, ethyl dibutylphosphinate, butyl dipropylphosphinate, dibutyl ethylphosphonate, diethyl heptanedioate, ethyl nonanoate, heptyl butyrate, isononyl acetate, methyl decanoate, propyl dibutylphosphinate, dibutyl propylphosphonate, diethyl phthalate, diethyl phthalate, diethyl suberate, ethyl decanoate, butyl dibutylphosphinate, dibutyl butylphosphonate, tributyl phosphate, phenyl salicylate, diethyl nonanedioate, dipropyl phthalate, diallyl phthalate, diethyl decanedioate, dibutyl phthalate, diisobutyl phthalate, dipentyl phthalate, butyl benzyl phthalate, diphenyl phthalate, di(2-ethylhexyl) isophthalate phthalate, butyl octyl phthalate, 1-ascorbyl palmitate, di(2-ethylhexyl) phthalate, dinonyl phthalate, quinine salicylate, di-n-decyl phthalate, didodecyl phthalate, a derivative thereof, or a combination thereof.

7. The method of claim 1 , wherein degrading the downhole article comprises leaching magnesium from the downhole article by the corrosive agent or a product of the corrosive agent.

8. The method of claim 7 , wherein the corrosive agent is the combination of the ester and the aminocarboxylic acid.

9. The method of claim 8 , wherein the magnesium which is leached from the downhole article is chelated by the aminocarboxylic acid.

10. The method of claim 9 , wherein the aminocarboxylic acid is a C1 to C35 and N1 to N10 aminocarboxylic acid.

11. The method of claim 10 , wherein the aminocarboxylic acid is selected from alanine; 1,2-bis(o-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid; 1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid; 1,4,7,10,-tetraazacyclododecane-N,N′,N″-triacetic acid; 2,2′,2″,2′″-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetic acid; diethylenetriaminepentaacetic acid; ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid); ethylenediaminetetraacetic acid; ethylene-bis(oxyethylenenitrilo)tetraacetic acid; 2-{6-[bis(carboxymethyl)amino]-5-(2-{2-[bis(carboxymethyl)amino]-5-methylphenoxy}ethoxy)-1-benzofuran-2-yl}-1,3-oxazole-5-carboxylic acid; N,N′-di(2-hydroxybenzyl)ethylenediamine-N,N′-diacetic acid; (hydroxyethyl)ethylenediaminetriacetic acid; 1,4,7-tris(carboxymethyl)-10-(2′-hydroxy)propyl)-1,4,7,10-tetraazocyclodecane; iminodiacetic acid; 2-[4-(bis(carboxymethyl)amino)-3-[2-[2-(bis(carboxymethyl)amino)-5-methylphenoxy]ethoxy]phenyl]-1H-indole-6-carboxylic acid; (methylimino)diacetic acid; 2,2′,2″-(1,4,7-triazanonane-1,4,7-triyl)triacetic acid; nitrilotriacetic acid; 2,2′,2″,2′″-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetraacetic acid; 3,6,9,12-tetrakis(carboxymethyl)-3,6,9,12-tetra-azatetradecanedioic acid; a derivative thereof; a salt thereof; or a combination thereof.

12. A method for degrading a downhole article, comprising:
introducing a composition comprising an ester or a combination of the ester with the aminocarboxylic acid into a borehole; the downhole article comprising a magnesium alloy, the magnesium comprising magnesium alloyed with one or more of the following: cadmium; silver; zinc; copper; cobalt; iron; nickel; strontium; or manganese;
hydrolyzing the ester to an organic acid;
adjusting, with the organic acid, the pH of the borehole proximate to the downhole article to a pH of about 4 to about 8; and
removing, by the organic acid, magnesium from the downhole article to degrade the downhole article,
wherein the composition is substantially free of acids other than the organic acid.

13. The method of claim 12 , wherein removing the magnesium from the downhole article comprises:
leaching magnesium from the downhole article by the organic acid; and
chelating magnesium by the organic acid.

14. The method of claim 1 , wherein the downhole article and the corrosive agent are selected such that the downhole article is degraded at a faster rate in the presence of the corrosive agent as compared to a brine without the corrosive agent; and further
the downhole article is degraded at a slower rate in the presence of the corrosive agent as compared to a mineral acid.

15. The method of claim 1 , wherein the downhole article is a packer ele

Assignees

• Crews James B
• Baker Hughes A Ge Co Llc

Inventors

• Crews James B

Classifications

• C09K8/52 Primary

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

• E21B29/00

  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

• C09K8/72 Primary

  Eroding chemicals, e.g. acids · CPC title