# US 2015/0147495 A1 · Scale-inhibiting coating

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- Number: US 2015/0147495 A1
- Document ID: US20150147495A1
- Status: Published application
- Kind: A1
- Application number: 14/090,070
- Filed: 2013-11-26
- Published: 2015-05-28
- Earliest claimed: 2013-11-26
- Assignees: Baker Hughes Incorporated
- Inventors: Deepak Kumar; Zhiyue Xu
- Web page: https://patentgrep.com/patent/US20150147495A1

## CPC

- E21B 41/02: in situ inhibition of corrosion in boreholes or wells
- B32B 1/00: Layered products having a non-planar shape
- B32B 1/08: Tubular products
- C09K 8/528: inorganic depositions, e.g. sulfates or carbonates
- E21B 17/00: Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; {Cables;} Casings; Tubings
- E21B 17/10: Wear protectors; Centralising devices {, e.g. stabilisers}
- C09K 2208/32: Anticorrosion additives
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1317: Multilayer [continuous layer]
- Y10T 428/1393: Multilayer [continuous layer]
- Y10T 428/30: Self-sustaining carbon mass or layer with impregnant or other layer
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a coating for inhibiting the formation of scales on one or more surfaces of a component used in the production of subsurface fluids. The coating comprises a diamond-like carbon structure doped with a dopant, such as silicon, titanium, fluorine, oxygen, or chromium. The dopant comprises between about 10% and about 40% of the coating by atom.

## Claims

### Claim 1

An article having a scale-inhibiting coating, comprising:
an article used in the production of subsurface fluids; and
a coating applied to at least one surface of the article, the coating comprising a diamond-like carbon structure doped with a dopant, the coating comprising the dopant at a concentration of between about 10 and about 40 atomic percent.

### Claim 2 (depends on 1)

The article of claim 1, wherein the dopant comprises silicon, titanium, chromium, fluorine, oxygen, or a mixture containing one or more of silicon, titanium, chromium, fluorine, and oxygen,.

### Claim 3 (depends on 2)

The article of claim 2, the diamond-like carbon structure comprising the dopant at a concentration of about 30 atomic percent.

### Claim 4 (depends on 1)

The article of claim 1, having a thickness of less than or equal to about 15 microns.

### Claim 5 (depends on 1)

The article of claim 1, the diamond-like carbon structure having a contact angle hysteresis of less than or equal to about 10 degrees.

### Claim 6 (depends on 1)

The article of claim 1, wherein the diamond-like carbon structure is formed using physical vapor deposition, chemical vapor deposition, plasma-enhanced chemical vapor deposition, primary ion beam deposition, or closed field unbalanced magnetron sputtering.

### Claim 7 (depends on 1)

The article of claim 1, wherein the surface of the article is a metallic surface or a ceramic surface.

### Claim 8 (depends on 1)

The article of claim 1, wherein the subsurface fluid is a hydrocarbon or brine.

### Claim 9 (depends on 8)

The article of claim 8, the article being a component used in the production of a subsurface fluid, comprising a seal or a sealing device component, a plug, a screen, a tubular, a coupling or coupling device component, a slip, a restraint, a chamber disc, a seal bore protector, a whipstock or a component thereof, a centralizer, a pin or set screw, a flapper, a biasing member, a gas generator, a milling device or associated component, a cutting device or component thereof, a packing or zone isolation device, or a valve.

### Claim 10 (depends on 1)

The article of claim 1, wherein the diamond-like carbon structure contains between about 60 percent and about 90 percent of sp2 bonded carbon.

### Claim 11 (depends on 1)

The article of claim 1, wherein the component comprises a subsurface component.

### Claim 12

An apparatus for production of a subsurface fluid, comprising:
one or more components configured to contact a subsurface fluid; and
a scale-inhibiting coating deposited on one or more surfaces of the one or more components, the coating comprising a diamond-like carbon structure doped with a dopant, the coating comprising the dopant at a concentration of between about 10 and about 40 atomic percent.

### Claim 13 (depends on 12)

The apparatus of claim 12, wherein the dopant comprises silicon, titanium, chromium, fluorine, or a mixture containing one or more of silicon, titanium, chromium, and fluorine.

### Claim 14 (depends on 12)

The apparatus of claim 12, wherein the coating has a thickness of less than or equal to about 15 microns.

### Claim 15 (depends on 12)

The apparatus of claim 12, wherein the component is disposed in a well.

### Claim 16 (depends on 12)

The apparatus of claim 12, wherein the component is a subsurface safety valve, a flow control valve, a production tubing, a biasing member, or a sleeve.

### Claim 17 (depends on 12)

The apparatus of claim 12, wherein the subsurface fluid is a hydrocarbon.

### Claim 18 (depends on 12)

The apparatus of claim 12, wherein the diamond-like carbon structure contains between about 60 percent and about 90 percent of sp2 bonded carbon.