TURBODRILL Russian patent published in 2009 - IPC E21B4/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas well drilling equipment and namely turbodrills used as a drive for a rock destruction tool. The turbodrill includes housing (1) with turbine stators (3) mounted in series therein, a shaft with turbine rotors (4) installed in series on its top, radial bearings (5), as well as a support (7) and channels installed at the bottom of shaft (2) with an internal cylindrical cavity (d) where the channels provide hydraulic connection between turbine outlet chamber (g) and internal cylindrical cavity (d) of the shaft and are placed in groups located in various cross sections of the shaft.

EFFECT: improved reliability of the turbodrill when used in drilling intervals at increased rates of penetration and with large amounts of sand in flushing fluid.

5 cl, 4 dwg