Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1987-06-08
1989-07-18
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
G01V 328
Patent
active
048496995
ABSTRACT:
In accordance with the present invention, a pulsed induction logging system is provided which includes a logging sonde for traversing a borehole and having downhole microprocessor/controller circuitry in operative contact with a separate host computer/controller at the earth's surface. The host computer/controller and two downhole microprocessor/controllers constitute a network of digital computers and generate a digital pulsed logging code for periodically permitting a radiation coil to be driven by an oscillating current having high peak power. A powerful primary pulse of electromagnetic (EM) energy is periodically generated for irradiating the adjacent formation for induction logging purposes. The sonde also includes an antenna array for detecting secondary induced fields in the formation around the borehole. The array preferably includes a series of grouped, paired coils axially spaced along the borehole. Each group of paired coils independently detects the secondary field. Thereafter each detected signal per group of paired coils, is digitized, reformatted and transmitted to the host computer/controller at the earth's surface. The serially transmitted digital data is highly accurate and capable of frequency domain transformation in situ. After additional processing in the frequency domain, final displays are accurate indications of formation conductivity and/or dielectric values irrespective of adverse formation-borehole effects.
REFERENCES:
patent: 3034042 (1962-05-01), Slack et al.
patent: 3317744 (1967-05-01), Geleynse
patent: 4481472 (1984-11-01), Glanzero
Brink Keith O.
Gill Stephen P.
Watson John D.
Eisenzopf Reinhard J.
MPI, Inc.
Snow Walter E.
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