DEVICE FOR REMOVAL OF DEPOSIT FROM WELL BOTTOM Russian patent published in 2002 - IPC

FIELD: oil producing industry, particularly, technology of well cleaning from deposits. SUBSTANCE: device includes supply pipe and tubing located in flow string. Mixing unit in tubing is made in the form of Venturi tube with capillary-porous throat between diffuser and contraction. Venturi tube together with tubing forms annular chamber. Supply pipe is communicated with annular chamber. Tubing has check valve in its lower part and is provided with perforation holes located above valve, at an angle to its wall. Diffuser has curved helical grooves on its internal surface. Tangentially connected to tubing, above check valve, are nozzles with internal curved helical grooves. Pressure regular is provided on discharge line. Supplied to annular chamber through supply pipe is working flotation reagent in aerosol state. EFFECT: higher efficiency of device operation and reduced power consumption for removal of deposits from well bottoms. 3 dwg