Computor-controlled oil drilling rig having drawworks motor...

Details Computor-controlled oil drilling rig having drawworks motor... Computor-controlled oil drilling rig having drawworks motor...

E - Fixed Constructions

21

B

341/91

E21B 44/00 (2006.01) E21B 15/00 (2006.01) G05B 15/02 (2006.01)

Patent

CA 1136733

COMPUTER-CONTROLLED OIL DRILLING RIG HAVING DRAWWORKS MOTOR AND BRAKE CONTROL ARRANGEMENT ABSTRACT OF THE INVENTION An oil drilling rig includes a racker, a power tongs, a drawworks having a motor and a brake, and a general purpose programmable digital computer associated with each to sequentially initiate the operation thereof. Closed-loop control systems for the drawworks motor and drawworks brake are included to provide control signals to a motor drive and to a brake actuator.

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