GAS-DYNAMIC OIL-GAS WELL SWABBING METHOD Russian patent published in 2007 - IPC E21B43/263 

FIELD: oil production, particularly to stimulate oil and gas inflow from contaminated differently-directed wells and for oil well recovery including that drilled in highly-viscous oil deposit.

SUBSTANCE: method involves lowering flow string in well; arranging packer in hole annuity over well bore zone; creating pressure drop in well and in neighboring well bore zone with the use of device provided with high-energy material, wherein the device comprises shell and solid-fuel charge. Pressure drop is provided on ground surface at well head having equipment with wellhead production tree and adapted to seal upper well section. Device with solid-fuel charge provides pressure drop on ground surface at well head. The device is secured to pedestal or vehicle, which prevents device displacement during solid-fuel charge combustion under the action of traction force created during device operation. Device with solid-fuel charge, as well as nozzle assembly, are arranged inside heat-resistant pipe case connected with flow string through sub, intermediate pipe and wellhead equipment from the first pipe case end. Nozzle assembly providing corresponding directional combustion product flow is directed opposite to sub. Another end of heat-resistant pipe case is secured to outlet pipe fastened to metering vessel. Liquid component supply control valve is installed at well head or included in intermediate pipe. Heat-resistant pipe case has means to change space between heat-resistant pipe case and nozzle assembly and outside nozzle assembly. Check valve is installed in flow string.

EFFECT: increased well bore zone swabbing efficiency along with following increased hydrocarbon product output due to possibility to use effects of high-energy material combustion at well head and due to simplified well cleaning technology.

1 ex, 1 dwg