| abstract |
polymersnthe selectednare from the group of olefin polymers, hydrogenated polyisoprenes,nhydrogenated copolymers of butadiene and isoprene and / or hydrogenatednCopolymers of butadiene, isoprene and styrene, optionally in a mixturenwith a non-aqueousnSolvent,na dispersant and emulsifiers are suitable as thickenersnin drilling fluids,nat least 70% by weight of a nonaqueous oil, a weighting agentnand a water-soluble onenSalt and optionally emulsifiers, fluid loss additives, alkali reserve,nWetting agents, biocides, thinnersnand / or corrosion inhibitors. |