| 摘要 |
<p>The present invention is for a roller for use with a roller stabiliser used in boreholes. The roller includes an outer symmetrical to its axis of rotation. A first surface of the outer surface is generally parallel to said axis of rotation whilst a second surface or part of the second surface converges towards the axis of rotation. The first surface includes a plurality of hard inserts whilst the said second surface includes a plurality of cutters. Typically the roller is positioned in the reaming stabiliser so that the second surface leads the first in the direction that the roller stabiliser is moving when drilling in a borehole. However, where the roller ends are identical, that is, they have converging surfaces, then the roller assists in cutting through formation both when drilling into the borehole or being moved out of it.</p> |
