Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent
1988-11-22
1992-09-22
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
367 85, 367 43, G01V 140
Patent
active
051503336
ABSTRACT:
This invention deals with a telemetering system in logging while drilling which utilizes pressure pulses in the drilling fluid circulation system. More specifically this invention deals with generation of pressure pulses in the "regime of hydraulic shock waves" as distinct from the "regime of slow variation of pressure." Both regimes have been defined in the disclosure. A means has been provided for generating hydraulic shock waves by rapidly changing the rate of flow of the circulation fluid by means of a downhole valve. The downhole information controls the actuation of the valve which generates a succession of wavelets each of which comprises two distinguishable pulses of opposite polarity. The signal received at the surface is processed by a digital filter system in order to improve the signal to noise ratio.
REFERENCES:
patent: 3309656 (1967-03-01), Godbey
patent: 3736558 (1973-05-01), Cubberly, Jr.
patent: 3742443 (1973-06-01), Foster et al.
patent: 3964556 (1976-06-01), Gearhart et al.
patent: 4866680 (1989-09-01), Scherbetskoy
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