Rate of penetration sensor for oil drilling rigs

Details Rate of penetration sensor for oil drilling rigs Rate of penetration sensor for oil drilling rigs

E - Fixed Constructions

21

B

255/1

E21B 45/00 (2006.01) G01B 13/02 (2006.01)

Patent

CA 1175038

ABSTRACT OF THE DISCLOSURE Apparatus for indicating the change in position of a travelling block coupled to a wire line which is wrapped around a drum, comprising a motion pickup device responsive to the drum for providing a first shaft output having a fixed relationship to the rotation of the drum, a variable drive unit responsive to the first shaft output for provi- ding a second shaft output having a variable relationship to the rotation of the drum, a pneumatic logic circuit respon- sive to the second shaft output for providing pulses that approximately coincide with each foot and each five-foot multiple of travelling block movement, and an output unit for displaying the foot and five-foot pulses. Calibration of the apparatus is accomplished by adjusting the variable drive unit to provide an average of the correct rate of travelling block movement relative to rotary motion of the drum.

417738

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