| 摘要 |
<p>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).</p> |
