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Electric field borehole telemetry

  • US 6,188,223 B1
  • Filed: 07/07/1997
  • Issued: 02/13/2001
  • Est. Priority Date: 09/03/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus to measure electric fields in a borehole, comprising insulative drill collars in an electrically conductive drillstring and there being insulated wireline means which is electrically connected lengthwise across said insulated drill collars, via upper and lower electrical connections, there being generating means including pulser means to generate said electric fields, there being upper and lower instrument housings associated with said electrical connections which are in part located within said housings, said housings supported within the drill string, the upper housing projecting above at least one of the insulating drill collars, and the lower housing projecting below said one insulating collar, said pulser means located within one of the housings.

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