THREADED JOINT FOR OIL WELL PIPE

WIPO Patent Application WO/2018/163829

A1

Provided is a threaded joint which is used in a thick-walled oil pipe and of which the joint efficiency is less than 1, wherein high sealing performance is ensured. A threaded joint (10) links oil pipes (1) together. The threaded joint (10) is provided with two pin parts (11) and a pipe-shaped coupling. Each of the pin parts (11) is provided at an end of the oil pipe (1) and is formed as a continuation of a pipe body (12), which has a wall thickness of 12 mm or more. A coupling (2) includes two box parts (21) and a recess part (22). The box parts (21) are provided to both ends of the coupling (2). The recess part (22) has a length of 10 mm or more. The joint efficiency of the threaded joint (10) is less than one. When T and L are defined by formulas (1) and (2), tpipe being the wall thickness of the pipe body (12), t1 and 2×L1 being the wall thickness and length of the recess part (22), and L2 being the length of the box parts (21), T and L satisfy formula (3).

JP5704191	Threaded joints for oil country tubular goods with excellent seizure resistance
JPH08226583	PIPE CONNECTOR
JP4087798	Screw-coupled structures, especially for radialally expandable conduits

INOSE KEITA (JP)
SUGINO MASAAKI (JP)
OKADA TAKASHI (JP)

PCT/JP2018/006296

September 13, 2018

February 21, 2018

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

F16L15/04; E21B17/042; F16L15/00

JPS50129402A	1975-10-13
JPH09119565A	1997-05-06
JPH10318455A	1998-12-04
JP2015132285A	2015-07-23
JPH0280886A	1990-03-20
JP3726302B2	2005-12-14

See also references of EP 3594548A4

UEBA, Hidetoshi (JP)

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