E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/042 (2006.01)
Patent
CA 2397154
The present invention relates to a thread joint and a drill element for percussive drilling wherein flushing water is used, comprising at least one substantially cylindrical external thread as well as a substantially cylindrical internal thread (12). The external thread is provided on a spigot (13) intended to constitute an integral part of a first drill string component. The threads (12) comprise thread flanks (16, 17; 18, 19) and thread roots (20; 21) provided between the flanks. The thread roots (20) of the cylindrical external thread is provided substantially distant from associated crests (22) of the cylindrical internal thread (12). By coating the thread roots (20) of the cylindrical external thread with at least one layer of a material of higher electrode potential than the underlying steel such as nickel, chromium, copper, tin, cobalt, titanium or alloys thereof an increased life length for the threaded connection is obtained.
L'invention concerne un joint fileté et un élément de perforation pour le forage par percussion dans lequel de l'eau de rinçage est utilisée. Ledit joint fileté comprend au moins un filet externe sensiblement cylindrique ainsi qu'un filet interne (12) sensiblement cylindrique. Le filet externe est prévu sur un bout mâle (13) destiné à faire partie intégrante d'un premier composant de train de forage. Les filets (12) comportent des flancs (16, 17, 18, 19) et des fonds (20, 21) entre les flancs. Les fonds (20) du filet externe cylindrique se trouvent à une certaine distance des sommets associés du filet interne cylindrique (12). L'enduction des fonds (20) du filet externe cylindrique d'au moins une couche de matériau à potentiel d'électrode supérieur à celui de l'acier sous-jacent, tel que du nickel, du chrome, du cuivre, de l'étain, du cobalt, du titane ou des alliages de ceux-ci, permet la prolongation de la durée de vie du joint fileté.
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
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