Screw joint for oil well piping

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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F16L 15/04 (2006.01) E21B 17/042 (2006.01) F16L 15/06 (2006.01)

Patent

CA 2293795

A screw joint for oil well piping excellent in sealing property, wherein a load flank 8l meets specified requirements, such a form that the inclined surfaces of a trapezoidal screw on both sides are brought into contact simultaneously when the screw joint is tightened so that an interference .DELTA. of at least 0.12 % of the outer diameter and with 0.8 % or less of the outer diameter in hoop stress is given is provided to a screw part, a clearance formed between the crest and root of the trapezoidal screw is reduced to 0.2 mm or less, and dimensional tolerances of the screw width and screw crest height meet specified requirements.

L'invention concerne un joint à vis pour tuyauterie de puits de pétrole possédant d'excellentes propriétés d'étanchéité, dans lequel un flanc de charge theta 1 répond à des exigences spécifiées. Le joint présente une forme telle que les surfaces inclinées des deux côtés d'une vis trapézoïdale sont mises en contact simultanément lorsqu'on serre le joint à vis, de sorte qu'une partie de la vis présente une surmesure DELTA d d'au moins 0,12 % du diamètre extérieur et une contrainte périphérique égale ou inférieure à 0,8 % du diamètre extérieur; un écartement formé entre le sommet et le fond de la vis trapézoïdale est réduit à 0,2 mm ou moins; et des tolérances dimensionnelles de largeur de vis et de hauteur de sommet de vis répondent à des exigences spécifiées.

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