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Oil and oil invert emulsion drilling fluids with improved anti-settling properties

  • US 6,339,048 B1
  • Filed: 12/23/1999
  • Issued: 01/15/2002
  • Est. Priority Date: 12/23/1999
  • Status: Expired due to Term
First Claim
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1. An oil or invert oil based drilling fluid composition comprising:

  • a) an oil or invert oil drilling fluid base formulation containing one or more organoclays and;

    b) one or more rheological additives which when free of diluent are pourable at ambient temperature comprising the condensation reaction product of;

    i) one or more polycarboxylic acids; and

    ii) a chemical selected from the group consisting of one or more liquid alkoxylated nitrogen containing compounds and polyetherdiamines which contain ≧

    2 active hydrogen groups;

    wherein the ratio of equivalents of carboxyl acids groups to the equivalents of active hydrogen groups is between 1.05 to 2.10.

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