FIELD: oil-and-gas industry.
SUBSTANCE: proposed device comprises barrel rigidly secured at flow string and provided with holes made in its wall and perforated casing pipe section-case. Said flow string can displace up and down with working elements secured thereat along the case. Said barrel has opposite upper and lower working elements composed by fixed swirler case, swirler and swirler guide cone that make a circular slot. Inner spaces of working elements are aligned with the barrel wall holes. Additionally, said barrel is provided with bypass channel of directed overflow to communicate annulus under lower working element and that above it. Resilient shutter is arranged at the barrel lower end.
EFFECT: higher reliability and quality of cleaning, swabbing effect.
2 dwg
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