Nippon Steel Corporation

Vallourec Oil and Gas France

Wesley Ott

Scott Granger

Steve Langford

Logan Van Gorp

Thimothé Delbosco

A flush self-locking threaded connection partially in a non-locking engagement comprises a first and a second tubular component provided respectively with male and female threaded zone at their respective ends. First portions of the male and female threaded zones with varying thread width and root cooperate along a self-locking tightening arrangement. A locking region within the threaded connection is located in the middle of non-locking regions, and radially centered to the pipe body API tolerances in order to withstand high torque and seal performances.

Self-locking threaded connection partially in non-locking engagement

A threaded connection comprising: a first tubular component () having a first male threaded portion () and a second male threaded portion (), a root width in the first male threaded portion () decreasing in a direction oriented a first pipe body (), the root width being constant in the second male threaded portion (), the second tubular component () comprising a female threaded zone () having a first female threaded portion () with a root width decreasing in a direction oriented towards a second pipe body (), the connection being partially made up in a self-locking arrangement in order to provide a locking region () and a non-locking region (), a female distal thread () of the locking region () has a width such that FDTW/TH>=125%, in which FDTW is a tooth width of the female distal thread () of the locking region and TH is the tooth height of said female distal thread ().

A self-locking threaded connection partially in a non-locking engagement includes a first and a second tubular component provided respectively with male and female threaded zone at their respective ends. First portions of the female threaded zones with varying thread width and root cooperate together along a self-locking tightening arrangement. A locking region within the threaded connection is located in the middle of non-locking, and radially centered to the pipe body API tolerances in order to withstand high torque and seal performances.

A threaded connection partially in a self-locking arrangement includes a first and a second tubular component provided respectively with male and female threaded zone at their respective ends. Only a portion of a first portion with varying thread width of the male threaded zone cooperates by self-locking tightening with only a portion of the second portion with varying thread width of the female threaded zone when made up one into the other. The connection is able to withstand high torques required for special applications such as drilling with casing or intermediate casing.

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Boulogne-Billancourt, France

Wesley Ott