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EM-guided drilling relative to an existing borehole

  • US 9,732,559 B2
  • Filed: 01/18/2008
  • Issued: 08/15/2017
  • Est. Priority Date: 01/18/2008
  • Status: Active Grant
First Claim
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1. A parallel drilling method that comprises:

  • gathering azimuthally-sensitive measurements of electromagnetic signals while drilling a new borehole near an existing borehole, said measurements being indicative of a formation resistivity; and

    steering a drill string along a path at a substantially constant distance from the existing borehole, wherein the drill string includes both transmit and receive antennas for making the azimuthally-sensitive measurements, and determining the substantially constant distance based at least in part on the formation resistivity measurements.

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