CONNECTION OF RODS OF DRILLING STRUCTURE Russian patent published in 2010 - IPC E21B17/02 

FIELD: oil and gas industry.

SUBSTANCE: connection of rods of drilling structure includes nipple and coupling, which interact during well drilling with their end surfaces, as well as with surfaces forming closed circuit, of which one surface is enclosed on nipple and the other one is enclosing on coupling. When removing the drilling structure from well, nipple and coupling interact by means of one or several cylindrical rollers in parallel transverse planes, which are located in through holes of coupling, the missing middle part of which is added with peripheral groove on external cylindrical surface of nipple projection. At that, safety of rollers located in holes is provided with spring locking ring placed in outer groove on coupling. Several slots are made on coupling to remove the locking ring from groove at disassembly of rods.

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

3 dwg