WEIGHTED DRILL PIPE WITH DOUBLE-BEARING LOCKING THREADED JOINT Russian patent published in 2020 - IPC E21B17/42 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas production and mining industry, namely to devices intended for protection against wear of weighted drill pipes due to its high weight and load on rock-destructing tool, bit, cutters and other tools, as well as to improve tightness of threaded connection of drill pipes and increase their torque. Weighted drill pipe includes pipe body, central flushing channel, coupling and nipple with locking threaded connections. Locking threaded connection is made with two-support structure, in which locking threaded connection consists of male coupling inner surface, with two stops, upper and lower, with upper inner contact end and lower inner contact end located after the last thread turn and made in the form of a special mating groove, and male surface of nipple with external thread, with two stops, upper and lower, with upper outer contact end and lower outer contact end, which is a continuation of upper end of nipple in form of collar with formation on end of flat platform, when screwing and contacting corresponding contact ends of nipple and coupling resting against special mating groove made inside coupling.

EFFECT: technical result consists in improvement of strength and tightness of threaded joint and, as a result, reliability, service life, reduction of costs for maintenance of weighted drill pipe due to increased fatigue resistance of threaded joints by more than 2 times due to design features of proposed weighted drill pipe and increase of its torque by more than 40 %.

1 cl, 4 dwg