FIELD: construction.
SUBSTANCE: invention relates to design of tubing with heat-insulating coating (HIC) and can be used in construction of heat-insulated strings with depth of up to 5,000 meters from jointed tubing, in oil and gas industry and geothermal power engineering. Tubing comprises pipe, on outer surface of which there is a heat-insulating coating, closed from above with a protective casing, two heat-insulated gripping areas, intended for gripping pipe with a hydraulic key or a slider during installation and dismantling of tubing, as well as connecting elements arranged at pipe ends, intended for pipes connection during their assembly into column. Each grip zone is formed by a disc, put on the pipe and attached to it, a ring enclosing the pipe and attached to the disc, as well as plates attached to outer surface of pipe and inner surface of ring, protective casing is attached to rings of gripping zones and is equipped with corrugated section for compensation of thermal deformations, and each connecting element of pipe is made in form of sleeve, fixed on outer surface of pipe at its end and equipped with levers, having possibility of contact with tightening coupling.
EFFECT: creation of tubing with HIC, having high heat-insulating properties, reliable and tight connection under conditions of action of simultaneously high temperatures and pressure and long service life.
6 cl, 3 dwg
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