TREATMENT AND CLEANUP METHOD OF BOTTOM-HOLE ZONE, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2015 - IPC E21B37/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: method includes creation of compressive pressure drop between bottomhole zone of stratum and cavity of tubing string by fluid injection, pressure release at motion of fluid from bottomhole zone to day surface, generation of periodic pressure pulses in bottomhole zone of stratum, repetition of pressure release stages and pressure pulse generation stages; control over these stages. Pressure drop is generated by fluid injection into the well at the preset pressure created in the first receiver during injection subperiod, while pressure release up to the preset value is made at opening of control valve during pressure release subperiod through the first receiver. Pressure is controlled against wellhead pressure sensor and bottomhole zone pressure sensor. When maximum flow rate is attained for permanent fluid flow in annular space during injection subperiod, a submersible flow shutoff device is actuated. When maximum pressure is obtained during injection period at bottomhole zone of stratum, the second receiver is switched on.

EFFECT: higher efficiency and stability of the well operation.

2 cl, 3 dwg