PROCESS OF TREATMENT OF FACE ZONE OF OIL WELL Russian patent published in 2003 - IPC

FIELD: oil and gas production, intensification of output of oil from flooded formations. SUBSTANCE: process of treatment of face zone of oil well includes successive injection of aqueous solution of polymer under pulse mode, then under mode of constant pressure. In process of injection of polymer solution under pulse mode there is used solution of following compositions, per cent by weight: polymer 0.001-0.005; polyglycol 5.0-15.0; water being the balance. Technological curing in this case lasts not less than 24 h, then circulation is carried out through circuit : " pumping unit-tubing string-pulsatorhole clearance-pumping unit ". After this injection is conducted under mode of constant pressure. Now polymer solution of following composition, per cent by weight, is utilized: polymer 1.5-10.0; polyglycol 10.0-30.0; oil being the balance. EFFECT: intensified oil output thanks to increased efficiency of reagent action on face zone of pool, formation of insulating screen most stable in time. 1 dwg, 1 tbl