ELECTROHYDROPULSING DOWNHOLE DEVICE Russian patent published in 2002 - IPC

FIELD: equipment for stimulation of bottom-hole zones of oil-gas-water bearing wells and grouting slurry for forcing into well annulus. SUBSTANCE: electrohydropulsing device has a hollow body serving as negative electrode with windows covered by circular membrane and filled with working fluid. The body accommodates throttle, check valve and positive electrode with insulator. Positive electrode is electrically connected with pulse currents generator. Working surfaces of positive and negative electrodes are made with high resistance to electrochemical corrosion, for instance, from technical copper. Working fluid is used in the form of solution of salt with alkaline properties in water with pH above 10, for instance, solution of soda ash in water with concentration of 0.1-0.3 g/l. EFFECT: provided parameters of pressure pulses at initial level in producing discharges generated by electrohydropulsing device during entire cycle of well treatment. 4 cl, 3 dwg, 1 tbl