Field test of a wideband downhole EM transmitter

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Description

A viable large bandwidth TEM transmitter can be constructed using very conventional means although in the present case the effective magnetic permeability of the solenoid core was lower than expected. Only a small number of turns can be used too maintain reasonably low inductance. This has to be compensated with the use of large currents. In this case, good ventilation must be provided to avoid overheating the electronics. In our case the most temperature sensitive element was the optic fiber transmitter which usually failed after about an hour of operation. Care must also be taken to guarantee balance between the ... continued below

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16 p.

Creation Information

Becker, Alex; Lee, Ki Ha & Reginato, Lou July 1, 1999.

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Description

A viable large bandwidth TEM transmitter can be constructed using very conventional means although in the present case the effective magnetic permeability of the solenoid core was lower than expected. Only a small number of turns can be used too maintain reasonably low inductance. This has to be compensated with the use of large currents. In this case, good ventilation must be provided to avoid overheating the electronics. In our case the most temperature sensitive element was the optic fiber transmitter which usually failed after about an hour of operation. Care must also be taken to guarantee balance between the negative and positive pulses as this improves the signal/noise ratio. Finally, we reiterate the need to review the origin and nature of the trigger pulse so that consistent properly clocked data can be acquired. In spite of the unlimited nature of the RFS tests which prevented us from acquiring data suitable for a direct demonstration of the wavefield transform, we did secure high quality wideband data that confirmed the proper performance of the prototype transmitter. We are certain that this equipment can now be used in an oil-field environment to acquire data suitable for a practical verification of the wavefield transform.

Physical Description

16 p.

Notes

OSTI as DE00760332

Medium: P; Size: 16 pages

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  • Other Information: PBD: 1 Jul 1999

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  • Report No.: LBNL--43762
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/760332 | External Link
  • Office of Scientific & Technical Information Report Number: 760332
  • Archival Resource Key: ark:/67531/metadc717650

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1999

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 7, 2017, 3:16 p.m.

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Becker, Alex; Lee, Ki Ha & Reginato, Lou. Field test of a wideband downhole EM transmitter, report, July 1, 1999; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc717650/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.