Title:
THREADED JOINT FOR STEEL PIPES
Document Type and Number:
WIPO Patent Application WO/2018/135266
Kind Code:
A1
Abstract:
Provided is a threaded joint for steel pipes, the threaded joint being configured so that high sealing performance can be ensured after the completion of tightening and so that the seizure of each seal surface during tightening can be prevented. A pin (10) has a nose section (112) including a pin tapered guide surface (112a), and also has a pin seal surface (113) including a tapered surface (113a). A box (20) has: a nose receiving section (22) including a box tapered guide surface (22a); a box seal surface (23) including a tapered surface (23a); and a buffer surface (24). The tapered surfaces (113a, 23a) have a second taper angle greater than the taper angle of each of the tapered guide surfaces (112a, 22a). A threaded joint (1) is configured to satisfy the relationships Dp2 > Db2 > Dp1 and Lb2 > Lp2. A buffer surface (24) located between the box tapered guide surface (22a) and the tapered surface (23a) has a length of 0.75 mm or greater and is disposed radially outside an imaginary plane (V).
Inventors:
SUGINO MASAAKI (JP)
UGAI SHIN (JP)
UGAI SHIN (JP)
Application Number:
PCT/JP2017/046878
Publication Date:
July 26, 2018
Filing Date:
December 27, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04; E21B17/042
Domestic Patent References:
| WO2009060552A1 | 2009-05-14 |
Foreign References:
| JPH08247351A | 1996-09-27 | |||
| US4538840A | 1985-09-03 | |||
| JPS60501322A | 1985-08-15 | |||
| JP2012506000A | 2012-03-08 | |||
| JP2012506000A | 2012-03-08 | |||
| JP2013524116A | 2013-06-17 |
Other References:
See also references of EP 3572702A4
Attorney, Agent or Firm:
UEBA, Hidetoshi (JP)
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