HOISTING PLANT Russian patent published in 2017 - IPC B66B15/00 B66B17/04 

FIELD: transportation.

SUBSTANCE: hoisting plant comprises a hoisting machine with friction multi-grooved drive friction pulleys mounted on the surface, and lifting vessels moving by means of ropes. The plant is additionally equipped with a hoisting machine installed at the design depth of a wellbore and a guide friction multi-grooved idler pulley located in the middle of the wellbore. The lifting vessels are equipped with a tooth comb fixed on their side walls, and on the branches of the same side-by-side ropes, wire-rope clamps are mounted with a pitch equal to the pitch of the comb teeth. The ropes of the hoisting machine installed on the surface bypass the guide friction multi-grooved idler pulley from below, and the ropes of the hoisting machine installed at the design depth of a wellbore bypass it from above.

EFFECT: increasing the load hoisting depth, the hoisting plant can provide a hoisting depth of more than 3,200 metres.

4 dwg