METHOD FOR WELL BOTTOM ZONE TREATMENT Russian patent published in 2007 - IPC E21B43/18 

FIELD: oil production industry, particularly to develop and operate wells, to perform well stimulation for well reworking and highly contaminated well injectivity recovery.

SUBSTANCE: method involves lowering assembly connected to flow string within well perforation interval, wherein the assembly comprises packer and paired rod pump including upper and lower bodies connected with each other by means or perforated pipe, rod stem with piston and ultrasound generator; separating tube space over perforation interval by means of packer; applying action of elastic ultrasonic vibrations in active technological liquid and acid solution on well bottom zone; removing reaction products along with washing-out treatment products; applying ultrasound action on formation; providing alternating liquid flow within perforation interval and light depression pulses. The ultrasound generator is mechanical generator, which is actuated by liquid flow passing through it in one direction. Ultrasound is applied along with liquid pumping into flow string at the forth pump operation stage.

EFFECT: increased efficiency of well and well bottom zone cleaning, improved output, simplified technology and decreased costs for well bottom treatment.

1 ex, 2 dwg