FIELD: drilling equipment.
SUBSTANCE: device has mast, hoisting mechanism, rotor, swivel with sub, leading pipe with spring-loaded stops, drilling pipes, mounted inside leading pipe and driving connection of leading and drilling pipe. Driving connection of leading and drilling pipes is made by intermediate sleeve, made with profiled outer surface, mounted moveably in leading pipe, made with profiled inner surface, length of which is less than length of drilling pipe, and connected to nipple portion of drilling pipe.
EFFECT: higher efficiency.
5 cl, 1 dwg
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