US 12,474,010 B2
Oil-well metal pipe
Tomoka Abe, Tokyo (JP); Koji Akioka, Tokyo (JP); Tomoya Matsuyama, Tokyo (JP); and Takao Kuranishi, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP); and VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries (FR)
Appl. No. 18/730,044
Filed by NIPPON STEEL CORPORATION, Tokyo (JP); and VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries (FR)
PCT Filed Jan. 31, 2023, PCT No. PCT/JP2023/003051
§ 371(c)(1), (2) Date Dec. 18, 2024,
PCT Pub. No. WO2023/153274, PCT Pub. Date Aug. 17, 2023.
Claims priority of application No. 2022-019788 (JP), filed on Feb. 10, 2022.
Prior Publication US 2025/0116357 A1, Apr. 10, 2025
Int. Cl. F16L 58/04 (2006.01); F16L 15/08 (2006.01); E21B 17/042 (2006.01)
CPC F16L 58/04 (2013.01) [F16L 15/08 (2013.01); E21B 17/042 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An oil-well metal pipe comprising:
a pipe main body including a first end portion and a second end portion, the pipe main body including:
a pin formed at the first end portion; and
a box formed at the second end portion,
wherein:
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 further comprising:
a zirconium oxide coating formed on one of the pin contact surface and the box contact surface,
a first resin coating formed on or above the zirconium oxide coating,
a plating layer formed on or above the other of the pin contact surface and the box contact surface, and
a second resin coating formed on or above the plating layer.