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Invert emulsion based drilling fluid and methods of using same

  • US 10,683,447 B2
  • Filed: 06/02/2017
  • Issued: 06/16/2020
  • Est. Priority Date: 02/03/2017
  • Status: Active Grant
First Claim
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1. A drilling fluid composition comprising:

  • a base fluid, where the base fluid is an invert emulsion comprising oil and water;

    one or more additives chosen from an emulsifier, a weighting material, a fluid-loss control additive, or an alkaline compound; and

    a viscosifier package, the viscosifier package comprising;

    a fatty acid having 6 or more carbon atoms; and

    an aliphatic polyester,the drilling fluid composition having a yield point of from 30 lbf/100 ft2 to 100 lbf/100 ft2 measured according to API recommended practice 13-B2 in accordance with;


    yield point=[2×

    (300 rpm reading)]−

    (600 rpm reading)and a low shear yield point of from 10 lbf/100 ft2 to 40 lbf/100 ft2 measured in accordance with;


    low shear yield point=[2×

    (3 rpm reading)]−

    (6 rpm reading),where the drilling fluid composition comprises from 0.33 lb/bbl to 20 lb/bbl of the viscosifier package.

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