METHOD FOR COMPLEX WELL BOTTOM ZONE TREATMENT Russian patent published in 2005 - IPC

FIELD: oil production industry, particularly for well operation, to perform stimulating works connected with cleaning casing pipe wall and filter of contaminants and for increasing yield of heavily contaminated wells, as well as for recovering injectivity of carbonate injection well reservoirs.

SUBSTANCE: method involves lowering stem assembly with ultrasound generator connected to flow string in well; exerting influence of elastic oscillations with ultrasonic frequency on well bottom zone in active process liquid and acid solution medium. The stem assembly includes packer, paired sucker-rod pump with body including upper and lower bodies connected one to another by perforated pipe and rod string with plunger. Packer isolates hole annuity parts located above and below perforation interval. Ultrasound is applied within perforation interval. Active process liquid is dissolvent solving acphalt-parafine-resinous deposits. After acid solution forcing well is left as it is to provide acid reaction. Then bed is drained to create alternating liquid flow within perforation interval and to provide depression impulses.

EFFECT: increased efficiency of bottom zone treatment.

1 ex, 1 dwg