TURBODRILL Russian patent published in 2010 - IPC E21B4/02 

FIELD: oil and gas production.

SUBSTANCE: invention relates to technical means for drilling and repair of oil and gas wells, namely to turbodrills to drive rock cutting tool. Turbodrill comprises body with serially fixed stators of turbine and bushing of body, shaft, upper portion of which comprises serially installed turbine rotors, radial supports that align shaft in body, and lower part comprises axial and radial supports, spacer bush of shaft with radial channels arranged over axial support, and at the same time lower part of shaft includes internal cylindrical cavity and radial channels, besides radial channels of spacer bush in cross section match shaft channels. An axial channel is arranged on outer surface of spacer bush of shaft at the entry area of each radial channel.

EFFECT: invention provides for high indices of turbodrill reliability at drilling intervals with increased speeds of tunnelling with high content of sand (or another abrasive substance) in drilling fluid.

5 cl, 3 dwg