PROCESS TO KEEP COLLECTOR PROPERTIES OF FACE ZONE OF POOL OF OIL PRODUCING WELL Russian patent published in 2000 - IPC

FIELD: oil industry. SUBSTANCE: process can find use for various actions on pool when well is operational, in particular, for its perforation, abandonment, etc. In agreement with process portion of water-in-oil emulsion based on hydrocarbon and water is pumped into well counter to flow. Emulsion on water base has surface-active substance and water-soluble salt of one or several types. Technological fluid based on water-soluble salt of one or several types is pumped above portion of water-in-oil emulsion. Then pool is subjected to action. Emulsion with density exceeding that of pool liquid is used as water-in-oil emulsion. It carries water-soluble surface-active substance of cation type in the amount providing for reduction of interphase tension in contact of water salt solution with hydrocarbon in shaft of well and oil in face zone. Portion of water-in-oil emulsion is prepared with relation of hydrocarbon and water base kept within (0.5-1.0)-(1.0-1.0). Density of aqueous solution of surface-active substance exceeds density of technological fluid. Technological fluid is pumped into well after holding of water-in-oil emulsion in well in the course of 12 hours as minimum. In this case hydrocarbon base of emulsion and oil are driven out of well. EFFECT: increased efficiency in keeping of collector properties of pool of oil-producing well thanks to exclusion of harmful blocking action on pool of liquids in which environment action on pool is executed, enhanced oil output. 10 cl