FIELD: drilling of oil and gas wells. SUBSTANCE: plant includes main lines of drilling mud and water, and successively hydraulically communicated accumulation vessel, pump, reagent mixer, centrifugal apparatus and filter. Plant has static hydraulic mixer of used drilling mud and water hydraulically communicated with inlet of accumulating vessel, shelf, thin-layer clarifier installed at the pump outlet. Hydraulic mixer is communicated with plunger pump and with inlet of shelf thin-layer clarifier through reagent mixer. Centrifugal apparatus is in form of hydraulic cyclone with spiral insert. Reagent mixer is in form of ejector mixer. EFFECT: reduced expenditures and higher reliability in clarification of used drilling mud. 1 dwg
