METHOD AND DEVICE FOR WELL BOTTOM ZONE DEVELOPMENT AND CLEANING BY IMPULSE DRAINAGE Russian patent published in 2006 - IPC E21B43/25 

FIELD: oil production industry, particularly to develop and clean well bottom zone of production oil-field wells.

SUBSTANCE: method involves injecting fluid in well to provide pressure drop between well bottom zone and production string interior; releasing pressure along with fluid movement from bottom zone to day surface; forming periodical pressure pulses in bottomhole reservoir zone; repeating above pressure release and pressure impulse forming operations along with performing control of above operations at each stage with the same fluid injection rate. Above pressure drop and periodical impulses are provided by injecting fluid in tubing string along with pressure increase in receiver during time period T₁. Pressure release to predetermined pressure value is carried out by control valve opening for time period T₂ trough receiver and hole annuity. Pressure is controlled by well head sensor and bottom zone pressure sensor.

EFFECT: increased efficiency and operational stability along with reservoir structure retaining.

2 cl, 6 dwg