Rotary torque and rpm indicator for oil well drilling rigs

Details Rotary torque and rpm indicator for oil well drilling rigs Rotary torque and rpm indicator for oil well drilling rigs

1979-11-23

1981-08-25

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

340539, E21B 4700

Patent

active

042852366

ABSTRACT:
Monitoring the torque applied by the rotary table to the drill string and the RPM of the drill string is provided. An intermediate adapter is positioned between the drill Kelly and the rotary table. A strain gauge is attached to the intermediate adapter to measure torsional deformation and provide an indication of rotary torque. Transmission of torque data is accomplished by radio frequency transmission utilizing a transmitter on the intermediate adapter. A receiver is mounted to the side of the drill rig floor to receive and demodulate the torque signal. The intermediate adapter is rotating at the same rate as the drill string. Detection of the revolutions utilizing the changing R.F. field strength is accomplished at the edge of the drill rig platform or elsewhere with a stationary sensor which doubles as the torque receiver. A highly directional torque transmitter antenna mounted on the adapter is used with the major lobe lying parallel to the rig floor and perpendicular to the pipe. By detecting the envelope of the radio frequency field strength, each rotation is marked by a peak. This enables continuous torque and RPM monitoring.

REFERENCES:
patent: Re28436 (1975-06-01), Vitter, Jr. et al.
patent: 3664184 (1972-05-01), Dyer
patent: 3691825 (1972-09-01), Dyer

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