METHOD FOR OIL-PRODUCING WELL CLEANING Russian patent published in 2007 - IPC E21B37/00 

FIELD: oil production equipment, particularly methods or apparatus for cleaning boreholes or wells.

SUBSTANCE: method involves cleaning well of solid particles present in reservoir fluid by electrohydraulic solid particle milling to obtain colloids, suspensions or emulsions and removing obtained colloids, suspensions or emulsions from well. The particles are milled by applying hydraulic impact waves thereto. The hydraulic impact waves are generated by electric discharges in liquid created by discharge of capacitor connected to discharge electrodes. The discharge electrodes are placed in parabolic reflector for directional reflection of hydraulic impact waves. Electrodes are arranged so that discharge occurs in parabolic deflector focus. Directional hydraulic impact wave deflection is formed so that hydraulic impact wave energy is mainly used for solid particle milling.

EFFECT: possibility of method use in different wells irrespective of well output, well bore curvature and producing depth, as well as decreased power inputs.

4 cl, 1 dwg