FIELD: oil and gas industry.
SUBSTANCE: invention relates to operation and underground repair of oil and gas wells using long-length flush-joint pipes, and namely to mechanisms for supply of coil tubing units. Traction chain of coil tubing unit supplying mechanism has shoe with shaped surface for pipe and fasteners for pivot joint of shoes to each other. Each shoe is made of shaped shoe and strap with shaped surface for pipe, attached to each other. Said shoe is configured to mount and remove pads with shaped surface for pipes of different diameters. Split surface between the shoe and pad is stepped and comprises peripheral and central parts disposed relative to each other in parallel planes. Central part of the split surface on the shoe case is made in the form of an internal slot in the shoe case, and the central part of the pad detachment surface is made in the form of a protrusion interacting with the above slot in the shoe case.
EFFECT: reduced time during re-adjustment of coil tubing unit chain from one tube size to another.
4 cl, 7 dwg
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