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 forming depression pressure drop between well bore zone and well interior; creating periodic pressure pulses in well bore zone, wherein the pressure pulses are generated as wave moving through well interior. The 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 when well fluid movement rate reaches value enough for hydraulic impact generation. The well is provided with hydroimpulsive device comprising hydropneumatic accumulator and quick-response valve. The valve is responsible to well head opening and communicates hydropneumatic accumulator with well interior. Hydropneumatic accumulator is connected with pressure source. To recover pressure liquid is pumped in hydropneumatic accumulator during wave propagation to well bottom and wave return to well head. Periodic pressure pulses in well bore zone are created by well head closing simultaneously with applying action of wave reflected from well bottom to well head. Impulse impact is created by valve opening along with wave power increase by hydropneumatic accumulator discharge.

EFFECT: creation of undamped wave having power enough to apply action to well bore zone.