Nanoparticle contained emulsion fluid succeeded field tests in Russia applied for water shut-off and well-kill. The water shut-off fluid showed -6% water cut and +189% oil recovery using acid at an average of 10 carbonate wells. Well-kill fluid could block multi-fractured horizontal well (sand stone) which polymer has failed to do in the past. The advantages of emulsion-nano system are no clogging due to reversibility of blocking effect, high thermal stability over 140 oC, and wettability alteration. The water shut-off fluid also gives a unique property of selectivity which blocks only water zones.
