Block position sensor

Details Block position sensor Block position sensor

1987-02-12

1990-08-28

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4500

Patent

active

049515055

ABSTRACT:
A block position sensor which is responsive to rotation of a drawworks drum for indicating change in position of a traveling block in a drilling rig is disclosed. The sensor includes elements for providing a first output having a fixed relationship to the rotation of the drum, the sensor having a rotatable component reflecting the output, the first output capable of driving an adjustable drive unit for providing a second output having an adjustable relationship to the rotation of the drum; and sensor elements adapted to detect angular rotation of the rotatable component of the sensor for providing a first output and to provide a signal corresponding to amount of rotation of the rotatable component.

REFERENCES:
patent: 2565951 (1951-08-01), Crookston et al.
patent: 4419886 (1983-12-01), Peterson
patent: 4616321 (1986-10-01), Chan

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