METHOD OF TREATMENT AND CLEANING OF WELLS AND BOTTOM-HOLE FORMATION ZONE Russian patent published in 1998 - IPC

FIELD: oil producing industry, particular, methods of cleaning, completion and recovery of well productivity, cleaning of bottom-hole formation zone, enhancing of producing ability of wells including inclined and horizontal ones. SUBSTANCE: method includes vibration action by hydrodynamic source which produces on bottom hole high-amplitude low-frequency elastic vibrations and gas-water foam when pumping through bottom hole of gas-water foam system - mixture of foam-generating solution and gas. Efficiency of treatment may be enhanced by addition to water of surfactant. To increase efficiency of cleaning of bottom-hole formation zone, gas-water mixture may be injected through annular space, and withdrawal of impurities with the aid of gas-water foam through tubing string. EFFECT: increased efficiency of cleaning of bottom-hole formation zone due to continuous action with intensive elastic vibrations and production in back flow of gas-water foam with regulated gas-content to ensure optimal level of depression on formation and most favorable conditions, both, for withdrawal of polluting liquid and solid particles from pore medium of reservoir and for efficient carrying of them along well bore, higher reliability of method embodiment within a wide interval of well depth values. 4 cl, 1 dwg