A thread joint and a male portion

E - Fixed Constructions – 21 – B

Patent

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Details

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

Patent

CA 2392411

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 (12) intended to constitute an integral part of a first drill string component (10A, 10B). The threads comprise thread ends (21-24) 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 (R). The generally cylindrical external thread (14) has a first axial length (L1) and the generally cylindrical internal thread (15) has a second axial length (L2), wherein the first axial length (L1) is shorter than the second axial length (L2) such that the both end areas (23, 24) of the cylindrical internal thread (15) do not contact the cylindrical external thread (14).

Cette invention un joint fileté et à un élément mâle de forage par percussion. Ce joint fileté comporte au moins un filetage extérieur généralement cylindrique (14) et un filetage intérieur généralement cylindrique (15). Le filetage extérieur (14), se trouve sur un goujon (12), conçu pour constituer une partie intégrante d'un premier élément de train de forage (10A, 10B). Les filetages possèdent des extrémités de filet (21-24) reliées à des filetages associés à profil droit. Ces filetages (14, 15) possèdent des zones terminales, la section longitudinale de chacun des filetages étant d'un diamètre (R) très restreint. Le filetage extérieur généralement cylindrique (14) est d'une première longueur axiale (L1) et le filetage intérieur généralement cylindrique (15) est d'une seconde longueur axiale (L2), la première longueur axiale (1) étant inférieure à la seconde (L2), de sorte que les deux zones terminales (23, 24)du filetage intérieur cylindrique (15) n'entrent pas en contact avec le filetage extérieur cylindrique (14).

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