Compositions and methods for corrosion inhibitor monitoring

Patent metadata

Field	Value
Publication number	US-2017355902-A1
Application number	US-201715617559-A
Country	US
Kind code	A1
Filing date	Jun 8, 2017
Priority date	Jun 10, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

Graphene quantum dots are functionalized by covalently bonding a corrosion inhibitor molecule thereto. In a useful method, a corrosion inhibitor compound is blended with a graphene quantum dot-tagged corrosion inhibitor compound, and the blend is applied to a metal surface, such as the interior of a carbon steel pipe. The blend inhibits corrosion arising from contact with produced water generated by hydrocarbon recovery from one or more subterranean reservoirs. The produced water having the blend dispersed therein is irradiated with a source of light having a selected first range of wavelengths, and the luminescent emission of the graphene quantum dot-tagged corrosion inhibitor is measured at a selected second range of wavelengths, thereby providing for real-time measurement of corrosion inhibitor concentration within the pipe.

First claim

What is claimed is:

1 . A composition comprising a graphene quantum dot having a particle size of about 2 nm to 20 nm; and a residue of a corrosion inhibiting compound covalently bonded to the graphene quantum dot, wherein the corrosion inhibiting compound is effective for inhibiting corrosion of a metal surface contacted with produced water.

2 . The composition of claim 1 wherein the corrosion inhibiting compound comprises one or more imidazoline, ammonium, alkylpyridine, phosphate ester, or thiol groups.

3 . The composition of claim 1 wherein the corrosion inhibiting compound is mercaptoethanol.

4 . The composition of claim 1 wherein the covalent bonding comprises a carboxyl or carboxamide group bonded to the graphene quantum dot and the corrosion inhibitor residue.

5 . The composition of claim 1 wherein the composition luminesces at a wavelength of about 600 nm to 700 nm when excited by light having a wavelength of about 500 nm.

6 . The composition of claim 1 wherein the particle size is about 2 nm to 10 nm.

7 . The composition of claim 1 wherein the metal surface is a carbon steel pipe interior surface.

8 . A composition comprising
a corrosion inhibiting compound effective for inhibiting corrosion of a metal surface contacted with produced water; and a graphene quantum dot having a particle size of about 2 nm to 20 nm and having a residue of the corrosion inhibiting compound covalently bonded thereto.

9 . The composition of claim 8 further comprising a solvent.

10 . A composition comprising
a produced water; a corrosion inhibiting compound effective for inhibiting corrosion of a metal surface contacted with produced water; and a graphene quantum dot having a particle size of about 2 nm to 20 nm and having a residue of the corrosion inhibiting compound covalently bonded thereto, wherein the total concentration of the corrosion inhibiting compound plus the graphene quantum dot is about 5 ppm to 5000 ppm by weight.

11 . The composition of claim 10 wherein the produced water comprises about 0.001 wt % to 95 wt % entrained hydrocarbon.

12 . A method of monitoring corrosion inhibitor concentration, the method comprising
applying a corrosion inhibiting composition to a produced water to form a tagged water source, the corrosion inhibiting composition comprising: a corrosion inhibiting compound effective for inhibiting corrosion of a metal surface contacted with produced water; and a graphene quantum dot having a particle size of about 2 nm to 20 nm and having a residue of the corrosion inhibiting compound covalently bonded thereto, wherein the concentration of the graphene quantum dot in the tagged water source is at least 0.1 ppb by weight and the total concentration of the corrosion inhibiting compound and the graphene quantum dot in the tagged water source is about 5 ppm to 5000 ppm by weight; irradiating the tagged water source with a source of light having a selected first range of wavelengths; and measuring the luminescent emission of the tagged water source at a selected second range of wavelengths, wherein the measuring is carried out substantially contemporaneously with the irradiating.

13 . The method of claim 12 wherein the second range of wavelengths is between about 600 nm and 700 nm.

14 . The method of claim 12 wherein the second range of wavelengths is substantially a single wavelength.

15 . The method of claim 14 wherein the wavelength is about 600 nm.

16 . The method of claim 12 wherein the first range of wavelengths is substantially a single wavelength.

17 . The method of claim 16 wherein the single wavelength is about 500 nm.

Assignees

• Ecolab Usa Inc

Inventors

• Moloney Jeremy
• Kundu Kousik

Classifications

• C23F11/08

  in other liquids · CPC title

• F16L58/1009

  the coating being placed inside the pipe · CPC title

• C09K11/07 Primary

  having chemically-interreactive components, e.g. reactive chemiluminescent compositions · CPC title

• G01J3/46

  Measurement of colour; Colour measuring devices, e.g. colorimeters (measuring colour temperature G01J5/60) · CPC title

• C23F11/162

  Thioaldehydes; Thioketones · CPC title