Directional boring

Details Directional boring Directional boring

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2248024

A directional boring apparatus is disclosed where the apparatus is controlled through a method which includes deviating a drill head (16) from a straight path into a desired direction angled away from the straight path. The deviation is achieved by applying an axial force to the drill head (16) when a drill head cutting member (18) is positioned within an arc of rotation through which the desired direction passes. The drill head (16) is retracted when the cutting member (18) is outside of the arc of rotation.

L'appareil de forage directionnel de la présente invention est commandé selon un procédé consistant à faire dévier la tête de forage (16) du trajet rectiligne pour qu'elle prenne un sens recherché formant un angle par rapport au trajet rectiligne. Pour réaliser cette déviation on applique à la tête de forage (16) une force axiale lorsqu'un élément de coupe (18) de la tête de forage vient s'inscrire dans un arc de rotation coïncidant avec le sens recherché, la tête de forage (16) subissant un retrait dès que l'élément de coupe (18) sort de l'arc de rotation.

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