Abstract
The paper presents results of design, development, manufacturing technologies, and experimental studies of prototypes of the multilayer tubing with thermal insulation from short basalt fibers and an outer shell of wound glass fiber. New multilayer tube was designed with hardening of the composite outer layer in the section exposed to hydraulic tongs impact during installation and tubes’ lowering into the oil wells. It was demonstrated that high-temperature and low-density thermal insulation of the tubes could be provided with the short basalt superthin fibers by grinding and cleaning them from impurities using the liquid method. Thermal and strength tests of the tube samples with the shortened regular part were made on the certified equipment and showed permissible temperature on the coating outer surface with more than twice higher safety margin of the fiberglass shell regarding tension and torsion.
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