FIELD: drilling equipment, particularly drilling strings.
SUBSTANCE: drilling string has at least two driving stems displaceable one relative another. The driving stems are provided with means, which transmit rotational moment from one driving stem to adjacent one. At least one of the driving stems consists of two sections formed of different materials.
EFFECT: optimization of operational and structural driving stem characteristics, reduced consumption of expensive high-strength material.
11 cl, 2 dwg
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