| 摘要 |
FIELD: mining. SUBSTANCE: device for control of drill bit is provided on the end of drill string inside well for selective drilling along the curved trajectory or along the straight trajectory. Device has the first drive unit located in well and connected with drill bit and which may rotate the drill bit to drill well. The first drive unit serves for inclination at some angle of drill bit rotation axis relative to axis of cross-section of constructed at the given moment well, and the second drive unit located in the well which connects the first drive unit with drill string and may rotate the first drive unit. Besides, device has also interlocking adapter which may selectively operate with the aim: (a) to rotate drill bit with the aid of the first drive unit at the moment when the first drive unit is kept in the preset axial orientation to perform drilling of well along the curved trajectory in direction of inclination of drill bit, and (b) to rotate bit by the first drive unit at the moment when the first drive unit is rotated by the second drive unit to drill the well along the straight trajectory. Drilling under any mode does not provide for mandatory rotation of drill string as a whole. EFFECT: higher efficiency. |
