FIELD: mining.
SUBSTANCE: column comprises shoe, pipes and connecting couplings. Outer diametre of lower pipe end at the length of 40·10-3 m from thread runout is by 1.5·10-3 m less than outer diametre of remaining part of pipes, and a ring is placed on it with a clearance of 0.5·10-3 m along diametre with heoght of 30·10-3 m from steel with high impact strength. Outer diametre of ring is equal to outer diametre of coupling, ends of ring and upper end of coupling are flat, without side slants.
EFFECT: improved reliability of column operation.
3 dwg
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