METHOD FOR FORMATION WELL BORE ZONE TREATMENT Russian patent published in 2012 - IPC E21B43/25 

FIELD: mining.

SUBSTANCE: method for treatment of formation well bore zone involves fluid pumping to borehole cavity, formation of depression pressure drop between formation well bore zone and borehole cavity by creating periodic pressure pulses in perforation zone in the form of a wave moving along borehole cavity. Wave is formed during periodic opening on mouth of borehole cavity which is under pressure and its closing using fluid drain and filling valves. Well pressure is increased by periodic opening. Valve opening is performed at the intervals providing its mass shaking. At that, pumping pressure and flow of pumped liquid is measured. Pumping is performed with gradual pressure increase during the time period which is enough for formation crack opening. Filling valve is closed and drain valve is opened after complete increase in pumping pressure and interruption of increase in fluid flow.

EFFECT: improving formation permeability.