| 摘要 |
A downhole tool comprising: an axial drive unit ( 10 ) having a connection for an electric power cable extending up the borehole, and including an anchoring mechanism ( 12, 16 ) operable in the borehole between a first configuration in which the anchoring mechanism resists rotational and axial movement of the unit, and a second configuration in which the anchoring mechanism is moveable axially in the borehole, an axial drive mechanism that moves the anchoring mechanism axially down the borehole when in the second configuration; a motor ( 28 ) mounted on the drive unit at the downhole end thereof; an hydraulic pump ( 30 ) connected to the motor, the pump providing a source of hydraulic power; and a functional unit connected below the hydraulic pump and powered thereby, operation of the axial drive mechanism acting to move the functional unit axially down the borehole. |
