F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 15/00 (2006.01) B24C 1/04 (2006.01) B24C 1/10 (2006.01)
Patent
CA 2555442
A screw joint for oil well pipe obtained by improving a conventional screw joint for oil well pipe to secure a sufficient fatigue breaking strength; and a method of producing the same. It is arranged that the axial residual stress in the thread bottom measured by X-ray stress analysis be 400 MPa or less for a depth of 40µm from the surface.
Joint à vis pour tube de puits de forage de pétrole obtenu en améliorant un joint à vis conventionnel pour tube de puits de forage de pétrole pour assurer une résistance suffisante aux fractures de fatigue ; et procédé de fabrication dudit joint. Il est prévu que la contrainte résiduelle axiale au bas du filet mesurée par analyse des contraintes aux rayons X soit inférieure ou égale à 400 MPa à une profondeur de 40µm de la surface.
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
Vallourec Mannesmann Oil & Gas France
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