TREATMENT METHOD OF BOTTOM-HOLE ZONE Russian patent published in 2013 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: treatment method of bottom-hole zone with high gas factor involves pumping of liquid to the well cavity. At that, there formed is depression pressure drop between bottom-hole zone and cavity of the well by creating periodic pressure pulses in perforation zone in the form of a wave moving along the well cavity. Wave is formed at periodic opening at the head of well cavity that is under pressure, and its closing by means of valves, one of which is gas-liquid mixture (GLM) drain valve, and the other one is liquid refilling valve. Drain valve connects the well cavity to drain tank and opens the well cavity for displacement of GLM and formation of depression impact wave. Liquid refilling valve connects the well cavity to source of liquid under pressure. Pressure is increased in the well by periodic opening. Valve opening is performed at the intervals providing pumping of GLM mass and formation of depression impact wave at its outflow. At that, during liquid refilling GLM pressure is increased in the well to the value that is higher than saturation pressure. When outflow is in progress, drain valve is closed at reduction of GLM outflow rate and the well cavity is kept in closed position till the drain valve opens during the time specified with process conditions.

EFFECT: strengthening hydrodynamic action on bottom-hole zone of the well.