TWO-ROTOR TURBODRILL Russian patent published in 2008 - IPC E21B4/02 

FIELD: engines.

SUBSTANCE: invention relates to the field of drilling equipment, particularly, to downhole motors, namely, to turbodrills. Turbodrill consists of spindle assembly, turbine sections assembly and power converter assembly connected consequently. Bodies of the mentioned assemblies form one rotor, their shafts form another rotor. The power converter assembly includes a separator, rigidly fixed to the lower end of drill column and connected with the power converter's body and shaft by means of rolling bodies and/or satellites of planetary gearing which is located in the separator and have ability to accordingly interact with casing and/or central wheels of planetary gearing, fixed in the body and at the shaft of the power converter assembly.

EFFECT: reduction of chisel rotation frequency by 1.5-1.8 times comparing to the serial turbodrills with simultaneous increase of torque at chisel.

4 cl, 5 dwg