the invention involves biopolymer / oil suspension compositions for the oil service industry , most particularly drilling and completion fluids , which provide such fluids a variety of desirable properties . biopolymers include water soluble polymers and water swellable polymers . such biopolymer / oil suspension compositions are essentially mixtures of biopolymers such as cellulosics in an oil medium with a specific anti - settling additive . the invention is particularly directed to providing enhanced anti - settling properties to such biopolymer / oil compositions ; that is , the ability of the biopolymer / oil composition to retain the biopolymers in suspension prior to the composition being introduced into drilling and completion fluids . the invention in one embodiment is described as a liquid biopolymer - in - oil additive compositions for use in aqueous - based completion fluids , containing an agent comprising : a ) one or more polyamides , and b ) hydrogenated caster oils including castorwax .