ROLLING DRILLING BIT Russian patent published in 2011 - IPC E21B10/24 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to rolling bits for well drilling with cleaning of bottom hole with gaseous agent. Bit includes legs with mounted bits and channels for supply of lubricating and cooling agents to supports of bits, central air jet nozzle with bush installed in it with two diametrically opposite side openings and cone-shaped reflector. Return valve made from elastic material is installed inside the bush for covering its side openings. The peculiar feature of the bit is that return valve is made in the form of hollow cylinder with inner partition diametrically located throughout its height; at that, longitudinal axis of partition is combined with the plane passing through the middle part of side openings. At that, return valve is fixed inside the bush throughout its height with its side sections located perpendicular to longitudinal axis of partition.

EFFECT: increasing operating efficiency of the bit owing to improving operating reliability of return valve by balancing and decreasing the stresses appearing in its material.

2 cl, 2 dwg