Communications: electrical – Selective – Interrogation response
Patent
1974-09-18
1976-01-13
Wilbur, Maynard R.
Communications: electrical
Selective
Interrogation response
340 18CM, 318171, 318231, 175 40, G01V 140
Patent
active
039328368
ABSTRACT:
In a system for logging while drilling, a downhole turbine is rotated by the hydraulic power in the circulating drilling fluid to provide mechanical power that is converted to regulated DC power. The DC power is converted to two-phase AC power by a DC/AC motor drive. The frequency of the two-phase AC power output of the DC/AC motor drive is modulated by the output of a downhole transducer which monitors a selected downhole condition. A two-phase AC induction motor is driven by the DC/AC motor drive at a speed which changes with the frequency modulation of the two-phase AC power. The induction motor drives an acoustic transmitter which interrupts the circulating drilling fluid to produce an acoustic wave in the drilling fluid that is frequency modulated in response to changes in the condition being measured by the downhole transducer.
REFERENCES:
patent: 2810546 (1957-10-01), Eaton et al.
patent: 3309656 (1967-03-01), Godbey
patent: 3471763 (1969-10-01), Germann et al.
patent: 3700987 (1972-10-01), Deering
patent: 3800277 (1974-03-01), Patton et al.
patent: 3855510 (1974-12-01), Houck
Allen Wallace B.
Harrell John W.
Buczinski S. C.
Hager Jr. George W.
Huggett C. A.
Mobil Oil Corporation
Wilbur Maynard R.
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