Drill stem connection

E - Fixed Constructions – 21 – B

Patent

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E21B 17/042 (2006.01)

Patent

CA 2602473

A double shoulder drill stem connection for high torque applications includes a thread taper within a range between about 1.0 and 1.2 inch per foot. The thread form is characterized by a stab angle between about 35 and 42 degrees and a load angle between about 25 and 34 degrees and by a short thread height with elliptical roots and with crests having an angle which slopes in an opposite direction with respect to the joint centerline from the thread taper. A drill string includes a tool joint having different inner diameters for a substantial axial length to provide enhanced strength in the threaded portion of the joint.

Raccordement de masse-tige à double épaule pour applications à couple élevé, comprenant un filetage conique dans une gamme comprise entre environ 1 pouce et 1,2 pouce par pied. La forme du filetage est caractérisée par un angle d'attaque compris entre environ 35 et 42 degrés et un angle de charge compris entre environ 25 et 34 degrés et par une faible hauteur de filetage avec des racines elliptiques et des crêtes dont l'angle est en inclinaison opposée à l'axe central du raccord s'étendant depuis le filetage conique. On décrit un train de tiges qui comprend un raccord de tige à différents diamètres internes pour une longueur axiale substantielle, permettant d'augmenter la résistance dans la partie filetée du raccord.

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