F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 15/00 (2006.01) E21B 17/042 (2006.01)
Patent
CA 2400820
The invention concerns a threaded tubular element (2) having a bevel such as a groove (30) produced in the material beneath the thread (4), to decrease the stiffness of the wall at the first engaged threads (22). The groove (30) enables to avoid additional tensile load at the first engaged threads (22) of the threaded element (2) whereon it is produced and the corresponding last engaged threads of the conjugated threaded element to which it is to be assembled to form a threaded tubular joint. The improved load transfer limits the risk of initial cracking due to fatigue on threaded tubular joints subjected to cyclic load without reducing their static performance.
L'élément fileté tubulaire (2) présente un délardement tel qu'une gorge (30) réalisée dans la matière sous le filetage (4), pour diminuer la raideur de la paroi au niveau des premiers filets en prise (22). La gorge (30) permet d'éviter un surcroît de transfert de charge de traction au niveau des premiers filets en prise (22) de l'élément fileté (2) sur laquelle elle est réalisée et des derniers filets en prise correspondants de l'élément fileté conjugué destiné à lui être assemblé pour réaliser un joint fileté tubulaire. Cette amélioration sur le transfert de charge limite les risques d'initiation de fissure de fatigue sur les joints filetés tubulaires soumis à un chargement cyclique sans réduire leurs performances statiques. Image
Robic
Sumitomo Metal Industries Ltd.
Vallourec Mannesmann Oil & Gas France
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