FIELD: oil production industry. SUBSTANCE: device has string of rods. Installed on string of rods is nozzle with calibrated orifice with diameter of 1.5-50 mm. Valve is seated in aforesaid orifice. Made in internal side of nozzle is passage for example along exponential curve. Protective housing and guide pipe are secured to rod at external side of nozzle. Application of aforesaid embodiment of device allows for cleaning passages from hardened paraffin and viscous matter for unobstructed passing of oil into well. EFFECT: higher efficiency. 1 dwg
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