| 摘要 |
<p>An apparatus for selectively orienting a bit (156) at the end of a drill string (135) in a wellbore (133), said apparatus connectable to a motive apparatus (127) for rotating said drill string (135) and said bit (156), said apparatus comprising: a control member apparatus comprising a control member (31) movable to effect a change in orientation of the bit (156) in the wellbore, and a signal apparatus (30) for producing a movement signal indicative of movement of said control member (31), and a controller (60) for communication with said motive apparatus (127) and said control member (31), the controller (60) for translating said movement signal from the control member apparatus into a command signal for the motive apparatus (127), the arrangement being such that, in use, the command signal commands the motive apparatus (127) to rotate the drill string (135) and the bit (156) substantially in correspondence with the movement of said control member (31).</p> |
