METHOD FOR FORMATION WELL BORE ZONE TREATMENT Russian patent published in 2014 - IPC E21B43/25 

FIELD: mining.

SUBSTANCE: invention refers to mining and may be used for development and recovery of production wells rate reduced due to clogging of well bore zone by asphaltic-resin-paraffin buildups and mechanical impurities. Substance of the invention: method includes fluid pumping into well bore cavity, oscillations generation by depression pressure differentials formed upon well bore cavity opening on the mouth for well bore fluid leakage under pressure and upon its closing using valves, one of which (drain valve) connects tubing string to dump tank, the second one (filling valve) connects annular space to fluid source under pressure. Well bore zone is treated by low-frequency oscillations along the spread of bed upon its cracks opening. For this purpose fluid pumping through filing valve is performed continuously into well bore cavity up to technologically permissible pressure and with rate enough for use of well bore fluid mass inertia, but not interfering with creation of depression pressure differential shock wave upon drain valve opening. After a time period sufficient for clog removal from bed cracks, drain valve is closed. Fluid pumping through filing valve is performed continuously up to technologically permissible pressure, drain valve is opened and cycle of well bore zone treatment is repeated.

EFFECT: improving well bore area filtration properties due to possibility of more complete cracks opening.