A thread joint, a male portion and a female portion

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/042 (2006.01)

Patent

CA 2391158

The present invention relates to a male portion a thread joint and a male portion for percussive drilling. The threaded joint includes at least one generally cylindrical external thread (14) and one generally cylindrical internal thread (15). The external thread (14) is provided on a spigot intended to constitute an integral part of a first drill string component (10A, 10B). The threads comprise thread ends provided in connection with associated full profile threads. The threads (14, 15) comprise end areas where each thread in a longitudinal section has its smallest radius. Conical guiding surfaces (25-28) are provided axially at each side of the threads (14, 15). The outer and inner ends of the spigot include conical guiding surfaces (25, 26) for cooperation with the conical guiding surfaces (27, 28) axially on each side of the internal thread (15). The imaginary cone apices of the conical guiding surfaces (25-28) are directed in an impact direction (F) and form an angle (.alpha.) with the centerline (CL) of the thread joint (10), said angle (.alpha.) being in the interval of 1-20°.

L'invention concerne un joint fileté à partie mâle et à partie femelle pour perforation pneumatique à percussion. Le joint fileté comprend au moins un filet externe généralement cylindrique (14) et un filet interne généralement cylindrique (15). Le filet externe (14) est établi sur un ergot conçu pour faire partie intégrante d'un premier train de sonde (10A, 10B). Les filets (14, 15) comportent des extrémités filetées établies en correspondance avec des filets associés à profil complet. Les filets (14, 15) comportent des zones d'extrémité sur lesquelles chaque filet pris dans une section longitudinale présente son plus petit rayon. Des surfaces de guidage coniques (25-28) sont établies axialement de chaque côté des filets (14, 15). Les extrémités externe et interne de l'ergot comprennent des surfaces de guidage coniques (25, 26) pour assurer la coopération avec les surfaces de guidage coniques (27, 28) axialement de chaque côté du filet interne (15). Les sommets de cône virtuels des surfaces de guidage coniques (25-28) sont orientés dans une direction d'impact (F) et forment un angle ( alpha ) avec la ligne centrale (CL) du joint fileté (10), et cet angle est compris entre 1 et 20 DEG .

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