| 摘要 |
A direction drilling adjusting tool (102), such as a bent sub, comprises a first housing part (116), and a second housing part (118) which selectively pivots relative to the first housing part. A first actuator (162) moves relative to the first housing part between a first position and a second position to cause pivoting of the second housing part. A second actuator (146) additionally moves relative to the first housing part in response to a pressure differential between drilling fluid inside and outside of the housing between at a first position and a second position allowing the first actuator to move to the second position. The tool is therefore controlled more easily and reliably than by means of pressure drop generated within the tool housing. |
