METAL PIPE FOR OIL WELL - NIPPON STEEL CORP

Title:

METAL PIPE FOR OIL WELL

Document Type and Number:

WIPO Patent Application WO/2022/045209

Kind Code:

A1

Abstract:

Provided is a metal pipe for an oil well capable of achieving compatibility between a high yield torque and an excellent seize resistance. The metal pipe for an oil well according to the present disclosure comprises a pipe main body. The pipe main body includes a pin (40) formed at a first end portion (10A) and a box formed at a second end portion. A plated layer is formed on a first contact surface being one of a pin contact surface (400) of the pin (40) and a box contact surface of the box, and a solid lubricant layer is formed on the plated layer. A second contact surface being the other of the pin contact surface (400) and the box contact surface has an arithmetic mean roughness Ra of 0.5-10.0 μm, and a rust-preventive coating film (80) in a semi-solid state or a liquid state is formed on the second contact surface.

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Inventors:

BENIYA YUKI (JP)
NAKAMURA KEIICHI (JP)
KURANISHI TAKAO (JP)

Application Number:

PCT/JP2021/031212

Publication Date:

March 03, 2022

Filing Date:

August 25, 2021

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)

International Classes:

F16L15/04; E21B17/042

Domestic Patent References:

WO2018216416A1	2018-11-29
WO2019074103A1	2019-04-18
WO2009072486A1	2009-06-11

Foreign References:

JP2002257270A	2002-09-11
JP2003042354A	2003-02-13

Other References: