THREADED JOINT FOR OIL WELL PIPE

WIPO Patent Application WO/2014/199619

A1

As a result of a case in which contact occurs at a stabbing flank surface (31B) being assumed in the prior art, it is not possible to reduce the action of a high concentrated load when the high concentrated load acts on a load flank surface (30P) of a threaded section on a pin pipe end side. Provided is a thread joint for an oil well pipe comprising a premium joint wherein a female thread pitch (20B) has the same value as a male thread pitch (20P) from a thread end section of the end side of a box (1) to a pitch change position (PCP) that is more to the central side of the box than a position that is one half the total length of the threaded section. The pitch changes at the pitch change position (PCP) to a value that is less than the male thread pitch so that a thread gap (10) gradually decreases from the pitch change position (PCP) to the thread end section of the central side of the box. As a result of the pitch change, the thread gap (10) reaches a final value of 0.2-0.8 times the value thereof prior to said pitch change.

WO/2022/039131	METAL PIPE FOR OIL WELL AND METHOD OF MANUFACTURING METAL PIPE FOR OIL WELL
JPH0712272	PIPING MEMBER
JP5097083	Synthetic resin tube

KAWAI TAKAMASA (JP)
TAKAHASHI KAZUNARI (JP)
CHIKATSUNE HIROSHI (JP)
YOSHIKAWA MASAKI (JP)
TAKANO JUN (JP)
NAGAHAMA TAKUYA (JP)
UETA MASATERU (JP)
SATO HIDEO (JP)
SEKI HARUHIKO (JP)
YONEYAMA TSUYOSHI (JP)

PCT/JP2014/003055

December 18, 2014

June 09, 2014

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JFE STEEL CORP (JP)

F16L15/04

JPH09126367A	1997-05-13
JPH0243948B2	1990-10-02
JPS62196488A	1987-08-29
JPS62196486A	1987-08-29
JP2001021072A	2001-01-26
US20060006647A1	2006-01-12
JP2001021072A	2001-01-26

See also references of EP 3009725A4

KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)

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