Drill head steering

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/18 (2006.01) E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 15/04 (2006.01) E21B 21/02 (2006.01) E21F 7/00 (2006.01)

Patent

CA 2502698

A method of steering a fluid drilling head in an underground borehole drilling situation is provided by rotating the flexible hose through which high pressure is provided to the drilling head and providing a biasing force on the drilling head. The hose can be rotated from a remote surface mounted situation by rotating the entire surface rig (13) in a horizontal plane about a turntable (24) causing the vertically orientated portion of the hose (11) to rotate about its longitudinal axis. The biasing force can be provided in a number of different ways but typically results from the use of an asymmetrical gauging ring on the fluid drilling head.

L'invention concerne un procédé de guidage de tête de forage à fluide dans une opération de forage de trou de sonde souterrain, consiste à mouvoir en rotation le flexible par lequel une haute pression est envoyée à la tête de forage, et par l'application d'une force de sollicitation sur ladite tête. Le flexible peut être mû en rotation depuis un dispositif éloigné monté en surface, par la mise en rotation de l'intégralité de l'appareil de forage en surface (13) dans un plan horizontal autour d'une plaque tournante (24) induisant la rotation autour de son axe longitudinal de la partie du flexible (11) orientée verticalement. La force de sollicitation peut se présenter sous différentes formes, mais résulte généralement de l'utilisation d'une bague de jaugeage asymétrique prévue sur la tête de forage à fluide.

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