METHOD OF COMPLEX ACTION ON FACE ZONE OF WELL Russian patent published in 2002 - IPC

FIELD: oil industry, treatment of face zone of well. SUBSTANCE: method of complex action on face zone of well includes extraction of down-hole pumping equipment, running of tubing string into well to face. Well is filled with solvent of asphalt-resin-paraffin deposits. Solvent is pushed through by forcing fluid into face zone of pool. Heater is sunk. Solvent is heated in perforation interval. Heater is removed and well is put into operation. Aqueous solution of 10% concentration of sodium bisulfate, of 10% concentration of sodium carbamide and of 0.5% concentration of sulphanol in volume of 1.0 cu. m/1 m of effective thickness of pool is used as solvent of asphalt-resin-paraffin deposits. Solvent is heated after it is forced through to face zone of pool. Interpipe clearance is sealed before forcing of solvent. EFFECT: enhanced efficiency of treatment of face zone and increased productivity of well. 4 tbl