FIELD: mining.
SUBSTANCE: group of inventions relates to round-trip systems, methods of lowering pipe string in well and lifting of said string from well by means of said handling system, as well as to methods of assembly or disassembly of pipe string by means of said handling system. Pipe-handling system comprises at least two pipe-handling units, arranged in a vertically displaceable manner along respective guide tracks of, respectively, first and second tower columns arranged in a tower. Pipe-handling unit includes lower and upper rotary units spaced apart vertically on a chassis, and each of rotary units comprises a rotary tong and a hanging-off device.
EFFECT: continuous movement of pipe string during lowering, lifting or drilling.
11 cl, 8 dwg
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