TURBODRILL Russian patent published in 1997 - IPC

FIELD: well drilling. SUBSTANCE: turbodrill includes a body provided with a nipple installed in its lower portion. There is a shaft installed in the body and rested on the step of higher diameter, turbines, axial and radial bearings. The turbodrill is provided with a sleeve with internal ledge, sleeve put on the shaft to rest on the ledge. A mean is provided on lower shaft end to connect a switch to drill bit. A ledge is made on the external surface of the sleeve. External diameter of the ledge is more than the least internal diameter of the lower nipple. EFFECT: higher efficiency. 1 dwg