High temperature hydrophobic chemical resistant coating for downhole applications

Patent metadata

Field	Value
Publication number	US-10352133-B2
Application number	US-201514931916-A
Country	US
Kind code	B2
Filing date	Nov 4, 2015
Priority date	Nov 4, 2015
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A downhole article comprises a polymer substrate having a surface that is configured for exposure to a well fluid; the substrate comprising a thermoplastic material, an elastomer, or a combination comprising at least one of the foregoing; and a coating disposed on the surface of the polymer substrate; the coating comprising a fluorinated poly-para-xylylene.

First claim

What is claimed is:

1. A downhole article comprising
a polymer substrate having a surface that is configured for exposure to a well fluid comprising an acidic brine comprising greater than 5 ppg of a polyvalent salt, which comprise one or more of the following: zinc bromide; zinc chloride; calcium bromide; calcium chloride; or magnesium chloride, at a temperature of greater than 100° F. to less than 670° F.; and
a coating disposed on the surface of the polymer substrate,
wherein the polymer substrate comprises a crosslinked self-reinforced polyphenylene;
the coating comprises a fluorinated poly-para-xylylene and has a thickness of 10 micrometer to 0.1 millimeter; and
the article is a backup ring.

2. The article of claim 1 , wherein the coating comprises:

3. The article of claim 1 , wherein the substrate further comprises 0.1 wt % to 15 wt % of a reinforcing additive, a non-reinforcing additive, or a combination thereof.

4. The downhole article of claim 1 , wherein the substrate comprises 0.1 to 25 wt % of glass based on the total weight of the substrate.

5. The downhole article of claim 1 , wherein the substrate comprises 0.1 to 5 wt % of glass based on the total weight of the substrate.

6. A method of protecting the article of claim 1 from a downhole environment, the method comprising:
providing the downhole article of claim 1 by depositing the fluorinated poly-para-xylylene coating having a thickness of 10 micrometers to 0.1 millimeter on the surface of the polymer substrate; the surface of the polymer substrate configured for exposure to the well fluid comprising the acidic brine at a temperature of greater than 100° F. to less than 670° F.; and the polymer substrate comprising the crosslinked self-reinforced polyphenylene; and
exposing the downhole article in the acidic brine which contains greater than 5 ppg of the polyvalent salt comprising one or more of the following: zinc bromide; zinc chloride; calcium bromide; calcium chloride; or magnesium chloride at a temperature of greater than 100° F. to less than 670° F.;
wherein the article is a backup ring.

7. The method of claim 6 wherein the downhole article is exposed to the brine at a temperature of greater than 300° F. to less than 670° F.

8. The method of claim 6 , wherein the brine is acidic with a pH of less than 4 and comprises greater than 5 ppg of the polyvalent salt, which comprises zinc bromide and calcium bromide.

9. The method of claim 8 , wherein the brine comprises greater than 10 ppg of the polyvalent salt.

10. The method of claim 6 further comprising exposing the downhole article to a hydrocarbon at a temperature of greater than 100° F. to less than 670° F.

11. The method of claim 6 , wherein the coating comprises:

12. The method of claim 6 , wherein the polymer substrate further comprises a filler comprising glass.

13. The method of claim 6 , wherein the brine is acidic with a pH of less than 3 and contains greater than 10 ppg of zinc bromide; calcium bromide; or a combination thereof.

14. The method of claim 6 , wherein the substrate comprises 0.1 to 5 wt % of glass based on the total weight of the substrate.

Assignees

• Sadana Anil
• Mathur Vipul
• Goodson James Edward
• Welch John C
• Baker Hughes A Ge Co Llc

Inventors

• Sadana Anil
• Mathur Vipul
• Goodson James Edward
• Welch John C

Classifications

• C08G2261/146

  Side-chains containing halogens · CPC title

• E21B41/00 Primary

  Equipment or details not covered by groups E21B15/00 - E21B40/00 · CPC title

• C08G2261/3424

  non-conjugated, e.g. paracyclophanes or xylenes · CPC title

• C08G2261/62

  Mechanical aspects · CPC title

• C09D165/04 Primary

  Polyxylylenes · CPC title