Measuring and testing – Borehole or drilling – Downhole test
Patent
1983-05-06
1985-05-07
Ruehl, Charles A.
Measuring and testing
Borehole or drilling
Downhole test
7386232, E21B 4700, G01L 314
Patent
active
045150117
ABSTRACT:
A downhole device which can be incorporated into the tubular drill string transmitting torque to the drilling bit and concurrently providing an indication of the torque transmitted. A telescopically interrelated housing and mandrel have their non-telescoped ends connected with the rotating power source and the drilling bit. A resilient torque transmitting mechanism, such as a helical spring, is mounted between the mandrel and the annular housing to transmit torque between such elements but at the same time produce an angular displacement of one element with respect to the other. A fluid passage is provided through the bores of the telescopically interrelated mandrel and the housing and communicating apertures are formed in the adjacent ends of such bores to produce a variable orifice whose pressure drop due to the flow changes as a function of the angular displacement of the housing and mandrel, hence as a function of the torque being transmitted.
REFERENCES:
patent: 774931 (1904-11-01), Bucknam
patent: 3154941 (1964-11-01), Westbrook
patent: 3855857 (1974-12-01), Claycomb
patent: 3864968 (1975-02-01), Anderson
patent: 3929009 (1975-12-01), Lutz et al.
Baker Oil Tools, Inc.
Ruehl Charles A.
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