METAL PIPE FOR OIL WELLS

WIPO Patent Application WO/2023/063384

A1

The present invention provides a metal pipe for oil wells, the metal pipe being able to be fastened with high torque. A metal pipe (1) for oil wells according to the present disclosure is provided with a resin film (100) on or above at least one of a pin contact surface (400) and a box contact surface (500). The resin film (100) contains, in mass%, 40.0% to 97.0% of an epoxy resin, 3.0% to 50.0% of a hydrated magnesium silicate powder, 0% to 10.0% of TiO2, 0% to 10.0% of a wax, 0% to 20.0% of a fluorine-based additive and 0% to 10.0% of graphite, while satisfying formula (1).　(1): (CW + CF + CG)/(CMg + CTiO2 + CSi) ≤ 0.28 In formula (1), the content of the wax expressed in mass% is assigned to CW; the content of the fluorine-based additive expressed in mass% is assigned to CF; the content of the graphite expressed in mass% is assigned to CG; the content of the hydrated magnesium silicate powder expressed in mass% is assigned to CMg; the content of TiO2 expressed in mass% is assigned to CTiO2; and the content of a silane coupling agent expressed in mass% is assigned to CSi.

JPS63120983	METHOD OF MACHINING SEAL RING GROOVE OF OIL WELL PIPE SCREW JOINT
JPH03288087	TUBE JOINT

ABE TOMOKA (JP)
TOMIYASU KEN (JP)
MATSUMOTO KEISHI (JP)
OCHIAI MAMORU (JP)
IWAKI YUICHI (JP)

PCT/JP2022/038193

April 20, 2023

October 13, 2022

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

F16L15/04; C23C26/00

WO2018216416A1	2018-11-29
WO2006104251A1	2006-10-05

JP2008069883A	2008-03-27
JPS61117286A	1986-06-04
CN103270146A	2013-08-28
JP2003021278A	2003-01-24

ASCEND IP LAW FIRM (JP)

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