Directional drilling apparatus

E - Fixed Constructions – 21 – B

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Details

E21B 7/06 (2006.01) F16H 49/00 (2006.01)

Patent

CA 2435380

Directional drilling apparatus having a non-rotating mass rotatably mounted on a mandrel and with a centre-of-gravity spaced form the mandrel axis. An offsetting arrangement is coupled to the mass, and has an outer profile defining an offset relative to the mandrel axis, and a bearing portion rotatably mounted on the offsetting portion. The apparatus is run on a string, and the offsetting portion is oriented relative to the mass. When the string is rotated the mass tends towards an orientation with its centre-of-gravity positioned towards the low side of the bore and tends to maintain the offsetting portion in a desired relative orientation.

La présente invention concerne un appareil de forage directionnel dont la masse non tournante est montée rotative sur un mandrin, le centre de gravité étant décalé par rapport à l'axe du mandrin. Une structure de déport couplée à la masse présente un profile externe définissant un déport par rapport à l'axe du mandrin et une partie de palier montée rotative sur la structure de déport. L'appareil circule sur un train de tiges, la structure de déport s'orientant par rapport à la masse. Lorsque le train de tiges entre en rotation, la masse a tendance à prendre une orientation par laquelle son centre de gravité se tourne vers le bas du trou, tout en ayant tendance à maintenir la structure de déport dans une orientation relative voulue.

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