FIELD: oil-and-gas production.
SUBSTANCE: device includes overlapping device consisting of sections of profiled pipes, connected by profile butts by means of welding with cylindrical sections at ends connected by thread, expander with expanding head, located over profiled pipe and allowing unit for connection with drilling pipes in the top and overlapping device in the bottom. At the bottom end of overlapping device it is located bottom with return valve. Rolling head from the bottom is outfitted by head with cutting elements. Bottom section of profiled pipes is outfitted from the bottom by profiled section with increased perimetre and internal diametre at expansion equal to external diametre of expansion of the rest profiled pipes. At the bottom edge of overlapping device by its perimetre there are implemented longitudinal samples.
EFFECT: there are increased technological properties, increases safety and fail-safety.
2 dwg
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