A method and a device for directional drilling

Details A method and a device for directional drilling A method and a device for directional drilling

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 7/18 (2006.01)

Patent

CA 2216784

A method and a device for directional drilling, especially for directional drilling of holes in the crust of the earth, e.g. gas and oil wells (1), where at least one shear jet (13) works an eccentrically located part face in relation to the substantially circular working face of a rotary bit (5). A device for directional drilling where one or more shear jets (13) are rotationally disposed around a rotational axis (11) eccentrically placed in relation to the axis (6) of the bit (5), and where the hit point of the shear jets (13) is asymmetrically situated in relation to the rotational axis (11). When the bit (5) rotates around the axis (6), the hit point of the shear jets (13) keeps a predetermined orientation in relation to the rotational axis (11), whereby the shear jets (13) sweep an area eccentrically located in relation to the axis (6) of the bit (5).

L'invention porte sur un procédé et un dispositif de forage directionnel s'appliquant notamment au forage de puits (1) de pétrole ou de gaz dans l'écorce terrestre. Selon ce procédé, au moins un jet de cisaillement (13) travaille dans une zone partielle excentrique par rapport à la zone d'attaque pratiquement circulaire d'un trépan (5) pour forage rotary. Le dispositif de forage directionnel consiste en un ou plusieurs jets de cisaillement (13) fixés de façon rotative autour d'axes de rotation excentrés par rapport à l'axe de rotation (6) du trépan (5). Le point d'impact des jets de cisaillement est asymétrique par rapport à l'axe de rotation (11). Lorsque le trépan (5) tourne autour de son axe (6), le point d'impact des jets de cisaillement (13) conserve une orientation prédéterminée par rapport à l'axe de rotation (11), le jet de cisaillement (13) balayant ainsi une aire excentrée par rapport à l'axe (6) du trépan (5).

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