Velocity control arrangement for a computer- controlled oil...

Details Velocity control arrangement for a computer- controlled oil... Velocity control arrangement for a computer- controlled oil...

E - Fixed Constructions

21

B

341/91

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

Patent

CA 1147432

ABSTRACT A computer-controlled oil drilling rig is characterized by apparatus for comparing signals representative of the actual velocity and direction of travel of a travelling block with signals representative of predetermined minimum and maximum velocities of the travelling block and a signal representative of a predetermined direction of travel of the travelling block. Output signals are generated if the actual velocity signals are greater than the maximum velocity signal or less than the minimum velocity signal and if the direction of the travelling block deviates from the predetermined direction.

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