FLUSH JOINT OF DRILLING RODS Russian patent published in 2010 - IPC E21B17/46 

FIELD: oil and gas industry.

SUBSTANCE: flush joint of drilling rods includes connection elements - nipple and coupling, which interact with their end surfaces at feed force transfer in drilling mode. At that, when removing the drilling structure from well, they interact by means of one or several cylindrical rollers in parallel transverse planes. Outer slots are made on cylindrical surface of nipple. On end surface of coupling there are end protrusions - teeth which enter slots and interact with them with their straight-sided profiles at transmission of torque moment.

EFFECT: improving reliability and life time of connection of drilling rods, providing the possibility of reversal of drilling member of the machine, simplifying the drilling structure assembly and disassembly operations.

3 dwg