G - Physics – 01 – V
Patent
G - Physics
01
V
324/9
G01V 3/18 (2006.01) G01V 3/28 (2006.01) G01V 3/38 (2006.01)
Patent
CA 1284674
Abstract of the Disclosure 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 induc- tion logging purposes. The sonde also includes an antenna array for detecting secondary induced fields in the forma- tion 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 trans- mitted to the host computer/controller at the earth's sur- face. 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 conduc- tivity and/or dielectric values irrespective of adverse formation-borehole effects.
568766
Brink Keith O.
Gill Stephen P.
Watson John D.
Mpi
Smart & Biggar
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