| 摘要 |
A device for use downhole comprises a body housing: a power source arranged to supply power to a driver; and a hydraulic system including a piston sealed in a chamber and an outlet provided at each opposing end of the chamberwherein each outlet is in communication with a respective reservoir, the driver being actuable to drive the piston in a first direction, such that fluid is driven out of the chamber through one outlet and simultaneously fluid is drawn into the chamber through the other outlet at the opposing end. |
