darley and george gray gulf publishing company 1988 the contents of which are hereby incorporated by reference various surfactants and wetting agents conventionally used in invert emulsion fluids may optionally be incorporated in the fluids of this invention such surfactants are for example fatty acids soaps of fatty acids amido amines polyamides polyamines oleate esters imidazoline derivatives oxidized crude tall oil organic phosphate esters alkyl aromatic sulfates and sulfonates as well as mixtures of the above generally such surfactants are employed in an amount which does not interfere with the fluids of this invention being used as drilling fluids viscosifying agents for example organophilic clays may optionally be employed in the invert drilling fluid compositions of the present invention usually other viscosifying agents such as oil soluble polymers polyamide resins polycarboxylic acids and fatty acid soaps may also be employed the amount of viscosifying agent used in the composition will necessarily vary depending upon the end use of the composition usually such viscosifying agents are employed in an amount which is at least about 0 1 preferably at least about 2 more preferably at least about 5 percent by weight of the total fluid vg 69 u2122 and vg plus u2122 are organoclay materials and versa hrp u2122 is a polyamide resin material manufactured.