Boring or penetrating the earth – Automatic control
Patent
1993-09-27
1994-10-25
Novosad, Stephen J.
Boring or penetrating the earth
Automatic control
175 40, 175 27, 73151, 364422, E21B 4400
Patent
active
053580583
ABSTRACT:
A rotary blasthole drilling apparatus comprises a rotary blasthole drill and a drill automation control system. The apparatus includes a pull-down motor and a drill motor. The pull-down motor is driven by a pump to provide a pull-down force to a drill string, and the drill motor is used to provide rotary force to rotate a drill bit of the drill string. The drill automation control system includes a number of functional components including a user interface. Through the user interface, an operator sets a rotary torque set point that determines an amount of torque applied to the drill bit by the drill motor. The control system further includes a detector, for detecting pressure in the pump during a drilling operation, and a processor, which is operative under the control of a program stored therein and responsive to the rotary torque set point and signals from the pull-down pressure sensor for generating an error signal. The error signal is applied to a proportional control valve for modulating the pull-down pressure to provide a substantially constant torque to the system. The rotary torque set point may be varied as a function of one or more of the following external factors: excessive mast vibration, bit air pressure or bit plunge.
REFERENCES:
patent: 4606415 (1986-08-01), Gray et al.
patent: 4760735 (1988-08-01), Sheppard et al.
patent: 5237540 (1993-08-01), Malone
patent: 5249161 (1993-09-01), Jones et al.
Kennedy, "Computer drilling System can provide optimizatiion, rig control", The Oil & Gas Journal, May 10, 1971, 4 pages.
Edlund Hans F.
Haines Marvin L.
Judson David H.
Novosad Stephen J.
Reedrill Inc.
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