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Electrically conductive non-aqueous wellbore fluids

  • US 6,770,603 B1
  • Filed: 02/05/2002
  • Issued: 08/03/2004
  • Est. Priority Date: 01/16/1999
  • Status: Expired due to Term
First Claim
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1. An electrically conductive invert emulsion wellbore fluid comprising:

  • i) from about 0.2% to about 10% by volume of carbon black particles, and ii) one or more emulsifying surfactant(s) selected from the group consisting of;

    nonionic emulsifiers of Hydrophilic-Lipophilic Balance (HLB) less than about 12, and anionic surfactants wherein the counter-ion is any of alkali metal, ammonium, or hydrogen ions, and wherein the wellbore fluid is substantially free of polyvalent metal cations and wherein the wellbore fluid has conductivity of at least 104 μ

    S/m.

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