An equipment for stimulating increased oil recovery is described. The complex is most suitable for operations in wells where natural flow and gas-lift recovery methods are used, and also for combined treatment of bottom-hole formation zones together with acoustic (ultrasonic) emitters. The complex consists of two main parts: a surface power supply and control unit, and a downhole electro-hydraulic instrument consisting of a boosting inverter unit a capacitor unit and a plasma discharger. Said instrument has a diameter less than 52 mm, allowing the instrument to pass freely through all existing production tubing. The instrument has a modular structure, making it possible to build up the power of the plasma discharge from 0.5 to 3 kJ. The plasma discharger is designed to be easily disassembled for replacement of electrodes and installation of a new spool with a wire, the discharger having a mechanical drive of a wire feeding unit, set in motion by a piston mechanism that is powered by a high pressure pulse produced by the discharger itself. Using the equipment for increase in efficiency and cost-effectiveness of oil recovery enhancement operations when working through tubing.