THREADED LOCKING CONICAL CONNECTION OF DRILLING PIPES AND METHOD OF INCREASING ITS CARRYING CAPACITY AND SERVICE LIFE Russian patent published in 2020 - IPC E21B17/42 

FIELD: mining; oil industry.

SUBSTANCE: invention relates to products of oil machine building and can be used in drilling of deep oil and gas wells, including with horizontal sections of their shafts. Threaded locking conical drill pipe joint includes a nipple and coupling parts combined with a matching axis of rotation, the pipe nipple part has a section with an external conical thread of a triangular profile and a thrust end near the base of the larger cone, and smaller cone of nipple part is equipped with threadless extender, coupling part of pipe has thrust end and is made with mating internal conical thread and bore for extension of nipple part. Threadless nipple extender is conical, and in coupling part there is a mating counter-thread with coaxial bore congruent with threadless cone of nipple extension, and end faces of nipple and coupling parts of threaded connection are made with negative taper.

EFFECT: technical result consists in increasing service life of threaded joint of drill pipes and bearing capacity of threaded connection in conditions of wells with complex spatial parameters, high sealing capacity of threaded joint.

3 cl, 1 tbl, 7 dwg