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Patent Searching and Data


Title:
THREADED JOINT FOR OIL WELL PIPE
Document Type and Number:
WIPO Patent Application WO/2018/163829
Kind Code:
A1
Abstract:
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).

Inventors:
INOSE, Keita (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
SUGINO, Masaaki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
OKADA, Takashi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/006296
Publication Date:
September 13, 2018
Filing Date:
February 21, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
VALLOUREC OIL AND GAS FRANCE (54 rue Anatole France, AULNOYE-AYMERIES, 59620, FR)
International Classes:
F16L15/04; E21B17/042; F16L15/00
Foreign References:
JPS50129402A1975-10-13
JPH09119565A1997-05-06
JPH10318455A1998-12-04
JP2015132285A2015-07-23
JPH0280886A1990-03-20
JP3726302B22005-12-14
Attorney, Agent or Firm:
UEBA, Hidetoshi (INTELIX Patent & Law Firm, Xymax Umeda-shinmichi Building 1-5, Dojima 1-chome, Kita-ku, Osaka-sh, Osaka 03, 〒5300003, JP)
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