FIELD: mining.
SUBSTANCE: downhole tool includes a coupling for placement on the body of a tubular article, and which is configured to change the structure from the first diameter configuration, in which the coupling is configured to move along the body of the tubular article in the configuration with the second the smaller diameter in which the coupling is configured to hold the tubular article on the body. The coupling or a portion of the coupling is configured for plastic deformation to change structure of the coupling from configuration with the first diameter into configuration with the second diameter, the coupling is mounted for rotation on the body of the tubular article in the second configuration.
EFFECT: reduced torque or friction of the rotating units.
19 cl, 20 dwg
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