Assembly for directional drilling of boreholes.

摘要

A directional drilling assembly comprises a downhole drilling motor and stabilizing means which stabilize the assembly in such a manner in the borehole that the bit driven by the output shaft of the motor has a tilted orientation in the hole. The stabilizing means comprise a lowermost stabilizer which is connected to the output shaft of the motor so as to suppress any sticking tendency of said stabilizer to the boreholewall.