Methods and apparatus for moving equipment along a borehole

摘要

A method of moving equipment along a borehole, comprises positioning the equipment in the borehole; and moving the equipment along the borehole by operation of a downhole driving tool connected to the equipment, operation of the driving tool comprising accumulating energy in the driving tool and releasing the energy to force a moveable member (76) against an impact surface (82) in the tool to provide a driving force which is applied to the equipment to move it along the borehole. A downhole tool for moving equipment along a borehole, comprises a tool body (80) having a first impact surface (82); a moveable member (76) having a second impact surface (78), mounted on the tool body and moveable between a first position distant from the first impact surface and a second position with the impact surfaces in contact; and a release mechanism for releasing the moveable member such that the energy in the accumulator creates a force on the moveable member and drives it from the first position to the second position; wherein an energy accumulator is connected to the moveable member; and the tool further comprises a system for energising the accumulator.