Improvement of resistance to fatigue of a threaded tubular...

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

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

Patent

CA 2547056

Radial interference between the male (3b) and female (4b) threadings operates between stabbing flanks (31, 36) inclined at about 27~ with respect to the axis of the threadings, wherein the mutual contacting surfaces are radially spaced from the root of the male threading (32), which is defined by a concave rounded portion. Thus micro~-cracks caused by friction between these surfaces during relative movements of the male and female threaded elements are not affected by tensile stresses moving along the, envelope (E) of the male thread root (32), improving the fatigue resistance of the connection. Application to hydrocarbon wells connected to offshore platforms.

Une interférence radiale entre des filetages mâle (3b) et femelle (4b) fonctionne entre des bords de guidage (31, 36) inclinés à environ 27?·¿ par rapport à un axe de filetage, les surfaces de contact mutuel étant radialement espacées du fond de filet mâle (32) qui est défini par une partie arrondie concave. En conséquence, les micro-fissures entraînées par la friction entre ces deux surfaces pendant des déplacements relatifs des éléments filetés mâle et femelle ne sont pas affectés par les contraintes de traction entre lesdites surfaces pendant lesdits déplacements relatifs des éléments filetés mâle et femelle le long de l'enveloppe (E) de fond de filet mâle (32), ce qui permet d'améliorer la résistance à la fatigue du raccord tubulaire. Cette invention s'applique à des puits d'hydrocarbures connectés à des plates-formes offshore.

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