Additives for oil-based drilling fluids

Additives for oil-based drilling fluids

  • CN 105,189,694 B
  • Filed: 03/18/2014
  • Issued: 10/27/2020
  • Est. Priority Date: 05/08/2013
  • Status: Active Grant
First Claim
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1. An additive for an oil-based wellbore treatment fluid, the additive comprisingA ground sulfonated asphalt compound comprising particles having a particle size distribution of D10, D50, and D90 as determined by standard particle size measurements, wherein:

  • the D10 particle size is less than 30 microns,the D50 particle size is less than 50 microns, anThe D90 particle size is less than 215 microns;

    wherein the ground sulfonated asphalt is present in the wellbore treatment fluid in an amount of from 0.1lbs/bbl to 15lbs/bbl such that the wellbore treatment fluid with the additive has 1lb/100ft2To 50lb/100ft2The yield point of (a).

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