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DRILLING FLUID AND METHOD FOR DRILLING IN COAL-CONTAINING FORMATIONS

  • US 20130206479A1
  • Filed: 08/26/2011
  • Published: 08/15/2013
  • Est. Priority Date: 08/26/2010
  • Status: Active Grant
First Claim
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1. A method for drilling in a coal containing formation, the method comprising:

  • providing a mixed metal-viscosified drilling fluid at least 0.05% (w/v) calcium sulfate;

    circulating the drilling fluid through the well; and

    drilling into the coal seam.

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