FIELD: oil and gas industry.
SUBSTANCE: method includes pumping of flush fluid into the well through tubular annulus to borehole pump and back through tubing to the surface; at that flush fluid represents aqueous solution of surfactants mixture. Before aqueous solution of surfactants mixture is pumped design volume of hydrophobic emulsion is pumped. Used hydrophobic emulsion has density higher than density of formation fluid and flush fluid has density lower than density of hydrophobic emulsion.
EFFECT: higher efficiency of flushing.
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