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DOWN-HOLE TRANSMITTER SYSTEM, METHOD OF INDUCING A TRANSIENT ELECTROMAGNETIC FIELD IN AN EARTH FORMATION, METHOD OF OBTAINING A TRANSIENT ELECTROMAGNETIC RESPONSE SIGNAL, AND METHOD OF PRODUCING A HYDROCARBON FLUID

  • US 20110036569A1
  • Filed: 07/01/2008
  • Published: 02/17/2011
  • Est. Priority Date: 07/03/2007
  • Status: Active Grant
First Claim
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1. A down-hole tool comprising a transmitter system for inducing a transient electromagnetic field in an earth formation, comprisingan induction coil with a number of windings to generate essentially a magnetic dipole field, which number of windings is divided into two or more groups of windings arranged to cooperatively generate the essentially magnetic dipole field when energized;

  • andswitching means arranged to essentially simultaneously terminate the energizing of the groups of windings;

    wherein the groups of windings are electrically isolated from each other or connected in parallel to each other, at least when the energizing is terminated.

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