Method and apparatus for controlling the rotational torque of a

Details Method and apparatus for controlling the rotational torque of a Method and apparatus for controlling the rotational torque of a

1985-11-22

1987-04-28

Novosad, Stephen J.

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

175 27, 173 8, 173 9, E21C 500

Patent

active

046606564

ABSTRACT:
A method and apparatus for controlling the rotational torque of a drill bit powered by a downhole motor. The downhole motor is suspended from a hydraulic ram at the lower end of a string of drill pipe. A torque sensor detects the reactive torque in the downhole motor during drilling. In response to the detected torque level, pressurized drilling fluid from the downhole motor is provided to the hydraulic ram thereby varying the weight applied to the drill bit in order to maintain a constant torque level.

REFERENCES:
patent: 1935105 (1933-11-01), Wooller
patent: 3550697 (1970-12-01), Hobhouse
patent: 3593807 (1971-07-01), Klima
patent: 4165789 (1929-08-01), Rogers
patent: 4195699 (1980-04-01), Rogers et al.

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