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Microemulsions to convert OBM filter cakes to WBM filter cakes having filtration control

  • US 7,838,467 B2
  • Filed: 05/04/2010
  • Issued: 11/23/2010
  • Est. Priority Date: 09/03/2004
  • Status: Active Grant
First Claim
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1. A thermodynamically stable, macroscopically homogeneous, single phase microemulsion (SPME) comprising:

  • a polar phase;

    a nonpolar phase;

    a surfactant; and

    a water-soluble filtration control additive selected from the group consisting of solid particulates, polymers and mixtures thereof.

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