Protecting a metal surface from corrosion

Patent metadata

Field	Value
Publication number	US-9416455-B2
Application number	US-201414316170-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jul 22, 2013
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A system and methods for protecting a metal surface from corrosion are provided herein. The method includes injecting particles comprising a sacrificial anodic material into a fluid proximate to the metal surface.

First claim

What is claimed is:

1. A method for protecting a metal surface within a flow system from corrosion, comprising
providing sacrificial anodic particles;
injecting the sacrificial anodic particles into a fluid stream within an injection manifold;
protecting the metal surface from corrosion through a reaction between the sacrificial anodic particles and the metal surface;
separating the sacrificial anodic particles from the fluid stream;
recycling the sacrificial anodic particles that have been separated from the fluid stream and that are reusable; and
re-injecting the recycled and reusable sacrificial anodic particles into the fluid stream.

2. The method of claim 1 , wherein the sacrificial anodic particles settles onto the metal surface.

3. The method of claim 1 , wherein the sacrificial anodic particles are suspended in the fluid stream.

4. The method of claim 1 , comprising mixing the sacrificial anodic particles with a carrier fluid prior to injection.

5. The method of claim 1 , comprising suspending the sacrificial anodic particles in a carrier fluid with little to no agitation before injection.

6. The method of claim 5 , wherein the carrier fluid is a gel, a liquid, or a combination thereof.

7. The method of claim 1 , wherein the sacrificial anodic particles are comprised of at least one of zinc, magnesium, and aluminum.

8. The method of claim 1 , wherein the sacrificial anodic particles have a diameter in a range of about 1 μm to about 100 μm.

9. The method of claim 1 , wherein the sacrificial anodic particles have a ferromagnetic core or shell.

10. The method of claim 1 , wherein the separating step includes settling tanks, filters, or flocculant units, or any combination thereof.

11. The method of claim 1 , wherein the recycling step includes extraction vessel, recycle valves, scrubbers, or any combination thereof.

Assignees

• Sun Wei
• Turner Douglas J
• Exxonmobil Upstream Res Co

Inventors

• Sun Wei
• Turner Douglas J

Classifications

• C23F13/06

  Constructional parts, or assemblies of cathodic-protection apparatus · CPC title

• C23F2213/31

  Immersed structures, e.g. submarine structures · CPC title

• C23F13/10 Primary

  Electrodes characterised by the structure (C23F13/16 takes precedence) · CPC title

• C23F2213/32

  Pipes · CPC title