| 摘要 |
A roll control and deflection device for a drilling apparatus which may include a hydraulic drive mechanism, an instrumentation unit, a drill motor, and a drill bit. The deflection unit is mounted between the drill motor and the drill bit and includes a foot which is extendible against the drill hole wall, forcing the drill to deflect from the previous drilling axis. A roll control apparatus is coupled between the drive mechanism and the mounting for the deflection unit and will roll the deflection unit to any angular position about the axis of the drill unit. |
