Measuring and testing – Borehole or drilling – Downhole test
Patent
1984-01-30
1986-01-28
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
7386103, E21B 4710
Patent
active
045663173
ABSTRACT:
Borehole fluid flow measuring apparatus is disclosed having a body member sized for passage through a wellbore. In a first embodiment of the invention, a thin metallic cross shaped disk is rotatably mounted in the body. Two solenoid coils are mounted in the body, their ends defining a plane facing the disk. The coils are each connected to separate oscillator circuits. Rotation of the disk in response to borehole fluid flow changes the amplitude of oscillation of each oscillator circuit because the impedance of each coil is changed when a metallic vane of the cross shaped disk is in line with the end of the coil. Because the disk is cross shaped, each revolution of the disk generates four pulses from separate demodulator - pulse shaping circuitry connected to the output of each oscillator circuit. One pulse train is selected as the reference train. The other pulse train leads or lags the reference train depending on the direction of rotation. Circuit means are provided for generating signals indicative of the speed of rotation of the disk and its direction. Speed of rotation of the disk is proportionally indicative of borehole fluid flow rate. Direction of rotation of the disk is indicative of fluid flow direction with respect to the body member. In a second embodiment of the invention, two light emitting diode/detector pairs are operably disposed opposite the plane of the vane presenting an optical path between the light emitting diode and the detector of a pair.
REFERENCES:
patent: 3002384 (1961-10-01), MacDonald et al.
patent: 3162042 (1964-12-01), Hart
patent: 3167958 (1965-02-01), Hollmann
patent: 3433070 (1969-03-01), Grimaldi
patent: 4088022 (1978-05-01), Kalotay
patent: 4109526 (1978-08-01), Rosso
patent: 4345480 (1982-08-01), Basham et al.
Garlewsky, P. et al., A Guide to Inductive Proximity Switches, Instruments and Control Systems, Oct. '81, pp. 49-52.
Myracle Jerry W.
Schlumberger Technology Corporation
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