METHOD FOR MOBILE VIBRATORY-CHEMICAL BOTTOMHOLE FORMATION ZONE CLEANING PLANT OPERATION Russian patent published in 2008 - IPC E21B43/27 

FIELD: oil production, particularly means to apply action to bottomhole formation zone.

SUBSTANCE: method involves supplying chemically active liquid into under-packer zone via flow string with the use of power unit of centrifugal pump by means of flow switching system with jet device nozzle by-passing. Liquid is supplied by means of hydraulic impacts created by pressure accumulator. Intake capacity change is recorded by flow meter installed in injection line. After that flow is switched for liquid supply from replenishing vessel to centrifugal pump inlet for liquid delivering to jet devices installed over packer. Liquid to be ejected has volume controlled by flow meter and is discharged via flow strings to surface into replenishing vessel.

EFFECT: increased differential pressure drawdown and provision of reaction product removal.

2 cl, 2 dwg