Drilling fluids having reduced sag potential and related methods

  • US 8,476,201 B2
  • Filed: 12/23/2010
  • Issued: 07/02/2013
  • Est. Priority Date: 12/23/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • providing a drilling fluid that comprises;

    an invert emulsion, the invert emulsion comprising an oleaginous fluid continuous phase, an aqueous fluid internal phase, and a surfactant;

    a weighting agent; and

    a plurality of colloidal particles, the colloidal particles comprising fibrous colloidal particles and at least one other type of colloidal particle;

    wherein at least a portion of the plurality of colloidal particles interact with the surfactant to form an associative supporting structure that inhibits sag of the weighting agent; and

    placing the drilling fluid in a subterranean formation via a wellbore penetrating the subterranean formation, wherein the weighting agent comprises barite particles and wherein the barite particles are less than about 45 microns in size.

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