E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/042 (2006.01) F16L 15/06 (2006.01)
Patent
CA 2473126
According to the present invention a thread joint of steel for percussive drilling where flushing water is used, comprises members having at least one external thread (16) or an internal thread (12). The thread (16) comprises thread flanks (21, 22) and thread bottoms (23) and thread crests (24) provided between flanks. Said members (19) consist of at least two different materials. The member is formed as a compound component (15). The thread bottoms (23) consist of stainless steel while the thread crests (24) consist of low alloyed steel. The invention further relates to a method for manufacturing a drill member.
L'invention un raccord fileté en acier pour forage par percussion utilisant de l'eau de rinçage. Ledit raccord comprend au moins un filetage externe (14) et un filetage interne (12). Le filetage (16) comprend des flancs (21, 22) des fonds (23) et des crêtes (24) situées entre lesdits flancs. Un élément (19) est composé d'au moins deux matières différentes. Cet élément est exécuté dans un composant composite (15). Les fonds (23) sont en acier inoxydable tandis que les crêtes (24) sont constituées d'acier faiblement allié. L'invention concerne également un procédé de fabrication dudit élément de forage.
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
LandOfFree
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