Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent
1994-02-28
1998-02-03
Bagnell, David J.
Boring or penetrating the earth
Automatic control
Of advance or applied tool weight
173 4, 254273, E21B 4400, E21B 1908
Patent
active
057134227
ABSTRACT:
The present invention provides a drilling system for drilling a borehole. A motor continuously coupled to the drawworks may be utilized to raise and lower a drill stem to continuously control the weight on bit at a desired value. A second motor rotates the drill stem. A control circuit is coupled to both the motors and receives information from various sensors which includes information about the rate of penetration, weight on bit; hook load, and rotational speed of the drill bit. The control circuit controls the drawworks motor to control the drill stem motion in both directions. In one mode the a desired rate of penetration is maintained by controlling the weight on bit. In another mode, the control circuit causes the drilling to start at an initial rate of penetration and then it starts to vary the rate of penetration according to programmed instructions to optimize the drilling efficiency. Yet, in another mode the control circuit causes the drilling to start at initial rotary speed and the weight on bit values and then varies the weight on bit and/or the rotary speed to obtain the combination of these parameters that yields the most efficient drilling of the borehole. If a mud motor is used to drill a borehole, the control circuit may be programmed to control drilling as a function of the differential pressure across the mud motor.
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