METHOD OF TREATMENT OF BOTTOM-HOLE FORMATION ZONE Russian patent published in 1997 - IPC

FIELD: oil and gas producing industry; may be used in breaking stable water-oil emulsions from asphalt-resinous-paraffin accumulations in bottom-hole formation zone. SUBSTANCE: method of treatment of bottom-hole formation zone in terrigenous deposits includes injection into well of compound containing solution of alkali and surfactant of nonionic type in fresh water. Depending on the well conditions, alkali is taken in form of, either, ammonium hydroxide, or sodium, or potassium hydroxide. Compound is injected down to bottom of tubing string, and the well is left inactive. A solvent density exceeds that of formation fluid, it lowers to the lower part of wellbore and reacts with producing formation during inactive state of the well. EFFECT: higher efficiency of treatment of bottom-hole formation zone in terrigenous deposits.