Device for steering drilling tools

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/06 (2006.01)

Patent

CA 2647397

The invention relates to a device for steering drilling tools, characterized in that it comprises, in succession from upstream to downstream, a main body (1) and a steerable housing (2) which are respectively connected, by at least one connection of the pivot, sliding pivot, ball joint or annular linear type, forming a first bearing (4), and at least one pivot connection, forming a second bearing (5), to a bendable or flexible transmission shaft (3) which passes through them longitudinally, whereas a connection of the pivot, sliding pivot, annular linear or ball joint type, forming a third bearing (6), between said transmission shaft and the main body (1) is arranged in the vicinity of that end of said main body situated in the direction of said steerable housing, and whereas the steering is performed by way of means acting as a deflection system (7) for the essentially radial relative movement of the main body (1) with respect to the steerable housing (2) in the vicinity of their interface, said main body being optionally equipped over its periphery with bearing pads (9) having a diameter less than or equal to the diameter of the drilling tool/bit (16), and said steerable housing being optionally equipped over its periphery with bearing pads (10a) having a diameter less than or equal to the diameter of the drilling tool/bit (16), towards its end situated in the direction of said drilling tool/bit, and with fixed or expansible pads or crampons towards its end situated in the direction of the main body (1). The device can be applied to drilling operations requiring course control.

L'invention concerne un dispositif pour l'orientation des outils de forage, caractérisé en ce qu'il comporte, consécutivement de l'amont vers l'aval, un corps principal (1) et un boîtier orientable (2), liés respectivement par au moins une liaison de type pivot, pivot glissant, rotule ou linéaire annulaire formant un premier palier (4) et au moins une liaison pivot formant un deuxième palier (5), à un arbre de transmission (3) incurvable ou flexible, qui les traverse longitudinalement, tandis qu'une liaison de type pivot, pivot glissant, linéaire annulaire ou rotule formant un troisième palier (6) entre ledit arbre de transmission et le corps principal (1) est agencée à proximité de l'extrémité du dit corps principal située du côté du dit boîtier orientable, et tandis que l'orientation est réalisée grâce à des moyens agissant comme système de déflexion (7) pour le déplacement relatif essentiellement radial du corps principal (1) par rapport au boîtier orientable (2) à proximité de leur interface, ledit corps principal étant en option équipé sur sa périphérie de patins d'appui (9) d'un diamètre inférieur ou égal au diamètre de l'outil de forage/mèche (16), et ledit boîtier orientable étant en option équipé sur sa périphérie de patins d'appui (10a) d'un diamètre inférieur ou égal au diamètre de l'outil de forage/mèche (16) vers son extrémité située du côté du dit outil de forage/mèche, et de patins ou crampons fixes ou expansibles vers son extrémité située du côté du corps principal (1). Application aux forages nécessitant un contrôle de trajectoire.

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