DEVICE FOR PRODUCING AN ELECTROHYDRAULIC EFFECT ON A WELL BOTTOM-HOLE ZONE

摘要

The invention can be used for restoring and increasing the flow rate of oil, gas and water wells, repairing casing strings and carrying out high-resolution seismic exploration. The technical result is that of reducing energy losses in a geophysical cable and ensuring that apparatus is capable of functioning when the length of the geophysical cable is greater than 5-6 km. The proposed device comprises a ground-level power source and a borehole electrical discharge apparatus that are connected by means of a geophysical cable, said borehole electrical discharge apparatus including the following components in the form of individual modules: a charging unit, a capacitor energy storage, a switch and an electrode system, the charging unit comprising an oil-filled metal housing with a low-voltage input mounted on one end thereof and a high-voltage output at the other end. A step-up transformer, a high-voltage rectifier and a protective choke are accommodated inside the housing, wherein one end of the secondary winding of the step-up transformer is connected via the high-voltage rectifier and protective choke to the high-voltage output and the other end of the secondary winding of the step-up transformer is connected to the housing. A discharge resistor and a capacitance-resistance network for measuring purposes are incorporated in parallel between the high-voltage output and the housing. The time constant of the capacitance-resistance network is selected so that it is less than the discharge time of the capacitor storage. The ground-level power source is in the form of a dc power supply. The charging unit additionally includes a capacitor filter, a transistorized bridge invertor and an invertor control circuit, wherein the capacitor filter, one of the diagonals of the bridge invertor and the input of the invertor control circuit are connected in parallel to the low-voltage input, the second diagonal of the bridge invertor is connected via a resonance capacitor to the primary winding of the step-up transformer and the output of the invertor control circuit is connected to the transistor control electrodes.