Self-locking threaded connection partially in non-locking engagement
AssigneesVallourec Oil and Gas France, Nippon Steel Corporation
InventorsWesley Ott, Logan Van Gorp, Scott Granger
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Abstract
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.
Claims19
A threaded connection comprising:
- a first tubular component including a first pipe body and a male member, the male member being arranged at a distal end of the first pipe body, an external peripheral surface of the male member comprising at least one male threaded zone, said at least one male threaded zone being arranged along a longitudinal axis of the threaded connection between the first pipe body and a male terminal surface;
- and
- a second tubular component comprising a second pipe body and a female member, the female member being arranged at a distal end of the second pipe body, an internal peripheral surface of the female member comprising at least one female threaded zone, said at least one female threaded zone being arranged along the longitudinal axis of the threaded connection between the second pipe body and a female terminal surface,
- wherein the male threaded zone having a first male threaded portion and a second male threaded portion, the first male threaded portion being arranged along the longitudinal axis of the threaded connection between the second male threaded portion and the first pipe body, a width of the thread roots (WRp1) of the first male threaded portion decreasing in a direction oriented from the male terminal surface towards the first pipe body, a width of the thread roots (WRp2) of the second male threaded portion being constant, said width of the thread roots (WRp2) of the second male threaded portion presenting a minimum root width of the male threaded zone, a male thread closest to the male terminal surface presenting a maximum root width value of the male threaded zone,
- wherein the female threaded zone comprising a first female threaded portion and a second female threaded portion, the first female threaded portion being arranged along the longitudinal axis of the threaded connection between the second female threaded portion and the second pipe body, a width of the thread roots (WRb1) of the first female threaded portion decreasing along a direction oriented from the female terminal surface towards the second pipe body, a width of the thread roots (WRb2) of the second female threaded portion being constant, said width of the thread roots (WRb2) of the second female threaded portion presenting a minimum root width of the female threaded zone, a female thread closest to the female terminal surface presenting a maximum root width value of the female threaded zone,
- wherein the first male treaded portion and the first female threaded portion are partially made up in a self-locking arrangement in order to provide a locking region in the threaded connection and wherein the threaded connection is a flush connection, and
- wherein the locking region is located between a first non-locking region and a second non-locking region.
Dependencies are inferred from the claim text.