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Method and apparatus for measuring mud resistivity

  • US 7,091,722 B2
  • Filed: 09/29/2004
  • Issued: 08/15/2006
  • Est. Priority Date: 09/29/2004
  • Status: Expired due to Fees
First Claim
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1. A sensor for measuring mud resistivity in a borehole, comprising:

  • a transmitter having a magnetic moment in a first direction; and

    a receiver having a magnetic moment in a second direction,wherein the first direction and the second direction are substantially different,wherein the transmitter and the receiver are disposed in an insulating collar of a downhole tool, andwherein the transmitter is disposed at a selected distance no more than 10 inches from the receiver along a longitudinal axis of the downhole tool.

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