Oil-well metal pipe, and method for producing oil-well metal pipe

Patent metadata

Field	Value
Publication number	US-12104085-B2
Application number	US-202118041829-A
Country	US
Kind code	B2
Filing date	Aug 16, 2021
Priority date	Aug 20, 2020
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

An oil-well metal pipe according to the present disclosure has a pipe main body including a first end portion and a second end portion. The pipe main body includes a pin formed at the first end portion, and a box formed at the second end portion. The pin includes a pin contact surface including an external thread part, and the box includes a box contact surface including an internal thread part. The oil-well metal pipe according to the present disclosure also includes a resin coating containing a resin, a solid lubricant powder, and copper phthalocyanine on or above at least one of the pin contact surface and the box contact surface.

First claim

The invention claimed is:

1. An oil-well metal pipe, comprising:
a pipe main body including a first end portion and a second end portion;
wherein:
the pipe main body includes:
a pin formed at the first end portion, and
a box formed at the second end portion;
the pin includes:
a pin contact surface including an external thread part;
the box includes:
a box contact surface including an internal thread part;
the oil-well metal pipe further comprising:
a resin coating containing a resin, a solid lubricant powder and copper phthalocyanine on or above at least one of the pin contact surface and the box contact surface.

2. The oil-well metal pipe according to claim 1 , wherein:
the resin coating contains 0.2 to 30.0 mass % of copper phthalocyanine.

3. The oil-well metal pipe according to claim 2 , wherein:
the resin coating contains:
0.2 to 30.0 mass % of copper phthalocyanine,
60 to 90 mass % of the resin, and
1 to 30 mass % of the solid lubricant powder.

4. The oil-well metal pipe according to claim 2 , wherein:
the resin coating contains 0.2 to 9.0 mass % of copper phthalocyanine.

5. The oil-well metal pipe according to claim 1 , further comprising:
a plating layer between at least one of the pin contact surface and the box contact surface, and the resin coating.

6. The oil-well metal pipe according to claim 1 , further comprising:
a chemical conversion treatment layer between at least one of the pin contact surface and the box contact surface, and the resin coating.

7. The oil-well metal pipe according to claim 5 , further comprising:
a chemical conversion treatment layer between the plating layer and the resin coating.

8. The oil-well metal pipe according to claim 1 , wherein:
the resin coating further containing a rust preventive pigment.

9. The oil-well metal pipe according to claim 1 , wherein:
at least one of the pin contact surface and the box contact surface is a surface that is subjected to one or more types of treatment selected from the group consisting of a blasting treatment and pickling.

10. The oil-well metal pipe according to claim 1 , wherein:
the resin is one or more types selected from the group consisting of epoxy resin, phenol resin, acrylic resin, urethane resin, polyester resin, polyamide-imide resin, polyamide resin, polyimide resin and polyether ether ketone resin.

11. The oil-well metal pipe according to claim 1 , wherein:
the solid lubricant powder is one or more types selected from the group consisting of graphite, zinc oxide, boron nitride, talc, molybdenum disulfide, tungsten disulfide, graphite fluoride, tin sulfide, bismuth sulfide, organic molybdenum, thiosulfate compounds, and polytetrafluoroethylene.

12. The oil-well metal pipe according to claim 1 , wherein:
the pin contact surface further includes a pin sealing surface and a pin shoulder surface, and
the box contact surface further includes a box sealing surface and a box shoulder surface.

13. A method for producing the oil-well metal pipe according to claim 1 , the method comprising the steps of:
preparing an oil-well metal pipe comprising a pipe main body that includes a pin including a pin contact surface that includes an external thread part, and a box including a box contact surface that includes an internal thread part;
applying a composition containing a resin, a solid lubricant powder and copper phthalocyanine onto at least one of the pin contact surface and the box contact surface; and
hardening the composition that is applied to form a resin coating.

Assignees

• Nippon Steel Corp
• Vallourec Oil & Gas France

Inventors

• Abe Tomoka
• Tomiyasu Ken
• Matsumoto Keishi
• Ochiai Mamoru

Classifications

• F16L15/04

  with additional sealings · CPC title

• C10N2040/02

  Bearings · CPC title

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title

• C10N2010/04

  Groups 2 or 12 · CPC title

• C10M2213/0623

  used as base material · CPC title