# US 11,078,576 B2 · Corrosion inhibitor, well, pipeline, and method for forming anticorrosion film

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- Number: US 11,078,576 B2
- Document ID: US11078576B2
- Status: Granted
- Kind: B2
- Application number: 16/326,879
- Filed: 2017-08-22
- Published: 2019-07-04
- Granted: 2021-08-03
- Earliest claimed: 2016-08-23
- Assignees: Inpex Corporation; Japan Oil, Gas and Metals National Corporation
- Applicants: Inpex Corporation; Japan Oil, Gas and Metals National Corporation
- Inventors: Yasuyoshi Tomoe
- Web page: https://patentgrep.com/patent/US11078576B2

## CPC

- C23F 11/10: using organic inhibitors
- C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells
- E21B 17/1007: {for the internal surface of a pipe, e.g. wear bushings for underwater well-heads}
- F16L 58/04: Coatings characterised by the materials used (F16L58/16 takes precedence)
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

This corrosion inhibitor can satisfactorily prevent corrosion of the inner surface of a well or pipeline, and contains an inhibitor (A) having a hydrophobic group and a polar group capable of donating an electron pair to a metal surface, an aromatic solvent (B), and hydrophobic nanoparticles (C).

## Claims

### Claim 1

A corrosion inhibitor comprising:
an inhibitor (A) which is N-dodecanoylsarcosinate, oleic imidazoline, or a combination thereof;
an aromatic solvent (B); and
hydrophobic nanoparticles (C).

### Claim 2 (depends on 1)

The corrosion inhibitor according to claim 1, wherein a boiling point of the aromatic solvent (B) is from 60 to 200° C.

### Claim 3 (depends on 2)

The corrosion inhibitor according to claim 2, wherein the hydrophobic nanoparticles (C) are carbon nanotubes.

### Claim 4 (depends on 3)

The corrosion inhibitor according to claim 3, wherein the carbon nanotubes are cup-stacked carbon nanotubes.

### Claim 5 (depends on 1)

The corrosion inhibitor according to claim 1, wherein the hydrophobic nanoparticles (C) are carbon nanotubes.

### Claim 6 (depends on 5)

The corrosion inhibitor according to claim 5, wherein the carbon nanotubes are cup-stacked carbon nanotubes.

### Claim 7 (depends on 1)

A well comprising tubing having an anticorrosion film formed on an inner surface of the tubing by the corrosion inhibitor according to claim 1.

### Claim 8 (depends on 1)

A pipeline comprising transport piping having an anticorrosion film formed on an inner surface of the transport piping by the corrosion inhibitor according to claim 1.

### Claim 9 (depends on 1)

A method for forming an anticorrosion film, the method comprising:
forming an anticorrosion film on an inner surface of a pipe by adding the corrosion inhibitor according to claim 1 to a hydrocarbon oil or production fluid inside the pipe.

### Claim 10 (depends on 7)

The method for forming an anticorrosion film according to claim 7, wherein the pipe is tubing installed in a well, or transport piping in a pipeline.