DUDIN'S GEARED TURBODRILL Russian patent published in 2009 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to drilling of inclined and horizontal holes. Geared turbodrill includes turbine, reduction gear with gearing, spindle, their housings being rigidly interjointed and furnished with shafts arranged in common oil-filled chamber with hydraulic lines to communicate with diaphragm lubricator inner chamber. Birotary turbine has its inner and outer rotors fitted coaxially on coaxial shafts. Note that inner rotor vanes enter the outer rotor vane space to get in contact with the outer rotor inner cylindrical surface. Note also that the outer rotor vanes enter the inner rotor vane space to get, also, in contact with the inner rotor outer cylindrical surface. Mind that both rotors can revolve relative to each other through preset angle, forced by drill fluid that fills the rotors vane space through slide valves arranged on the turbine outer rotor.

EFFECT: spindly shaft increased torque due to higher efficiency of using drill fluid flow energy.

5 dwg