Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1972-06-27
1976-06-01
Spar, Robert J.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
254189, 166 77, 173147, B66C 2360
Patent
active
039603601
ABSTRACT:
A workover rig for lifting or lowering oil well pipe into a well casing is disclosed. The rig has a mast structure adapted to communicate hydraulic fluid to a drive cylinder which actuates a pulley system operably connected to a pipe hoist or traveling block with remotely operable pipe engaging grips. The dynamic loading on the mast is minimized by the drive cylinder which is affixed to a cross head at the mast crown and the fluid pressure force in the mast which automatically compensates for shock and weight loads on the mast. A hydraulic control system is operative in a regenerative high speed mode to permit multiple speed operation of the hoist. The structure is adapted to be supported at the well casing to transfer the load from the oil well platform to the casing. The method includes operating the mast in conjunction with an adjustable tension winch to efficiently transfer pipe between the mast and pipe storage area.
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Elliston Thomas L.
Noland Kenneth
Spar Robert J.
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