In one aspect, this invention relates to the use of thermoset nanocomposite particles as components of drilling fluid, drill-in fluid, completion fluid, and workover fluid additive packages to reduce fluid losses to a formation and/or to enhance a wellbore strength In another aspect, this invention relates to the use particles of specific gravity ranging from about 0 75 to about 1 75 as components of drilling fluid, drill-ιn fluid, completion fluid, and workover fluid additive packages to reduce fluid losses to a formation and/or to enhance a wellbore strength Using embodiments of the invention, reduction of fluid loss and/or enhancement of wellbore strength may be achieved while working with water-based, oil-based, invert emulsion, or synthetic drilling muds The currently most preferred embodiments of the invention use substantially spherical thermoset nanocomposite particles.
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