WELL BORE ZONE TREATMENT METHOD Russian patent published in 2006 - IPC E21B43/25 

FIELD: mining, particularly to develop production wells and to recover output from well having bore zone mudded with asphalt-tar-paraffin deposits and mechanical injuries.

SUBSTANCE: method involves lowering flow string in well and creating depression pressure drop between well bore zone and well interior by creating periodic pressure pulses in well bore zone, wherein the pressure pulses are generated as shock wave moving through well interior. The shock wave is created as a result of periodic well interior opening at well head to discharge pressurized well fluid into vessel due to preliminary fluid injection in well, as well as well head closing during well fluid movement. Lower flow string section is provided with profiled channel and hydroimpulsive device comprising hydropneumatic accumulator and valves to charge and discharge hydropneumatic accumulator. The valves for hydropneumatic accumulator filling are check valves, which are adapted to fill hydropneumatic accumulator chambers. The valves for hydropneumatic accumulator discharge are quick-response valves and are adapted to adjust opening threshold depending on pressure value and provide liquid displacement with compressed gas through profiled channel, which is directed for well boring. During well treatment lower end of flow string is moved along perforation height.

EFFECT: creation of substantial pressure pulses during deep well treatment and increased rate of standing wave attenuation.

1 dwg