Threaded thin-walled drill tube joint

Details Threaded thin-walled drill tube joint Threaded thin-walled drill tube joint

E - Fixed Constructions

21

B

E21B 17/042 (2006.01)

Patent

CA 2756220

A member (1) of a joint for a thin-walled drill tube presents a central axis (A) and comprises a thread (4) for forming a screw joint. The thread presents a thread bottom (6), a thread top (7), a pressure flank (8) and a clearance flank (9). The pressure flank (8) presents a portion having a negative angle (21) less than 7.5, but at least 0, relative to a direction perpendicular to the central axis (A).

Un élément (1) d'un joint pour un tube de forage à faible épaisseur de paroi présente un axe central (A) et comprend un filetage (4) pour former un joint à vis. Le filetage présente une partie inférieure de filet (6), une partie supérieure de filet (7), un flanc de pression (8) et un flanc de dégagement (9). Le flanc de pression (8) présente une partie comprenant un angle négatif (21) inférieur à 7,5 o , mais au moins égal à 0 o , par rapport à une direction perpendiculaire à l'axe central (A).

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