The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2021
Filed:
Feb. 21, 2018
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Abstract
High sealing performance is provided in a threaded connection used for pipes for oil wells with large wall thickness and with a connection efficiency smaller than 1. A threaded connection () connects pipes for oil wells (). The threaded connection () includes two pins () and a tubular coupling. Each of the pins () is provided on an end of the pipe for oil wells () and is in continuity with the pipe body (), which has a wall thickness not smaller than 12 mm. The coupling () includes two boxes () and a recess portion (). The box () is provided on both ends of the coupling (). The recess portion () has a length not smaller than 10 mm. The threaded connection () has a connection efficiency smaller than 1. When the wall thickness of the pipe body () is expressed as t, the wall thickness and length of the recess portion () are expressed as tand 2×L, respectively, and the length of each of the boxes () is expressed as L, and if the following expressions (1) and (2) define T and L, then, T and L satisfy the following expression (3):