ELECTRODE SYSTEM FOR DOWNHOLE ELECTRIC HYDRAULIC DEVICE Russian patent published in 2008 - IPC E21B43/24 

FIELD: oil production, particularly for oil or gas well bottom zone treatment and for well output increase, as well as for high resolution seismic well logging.

SUBSTANCE: electrode system comprises coaxial positive electrode and negative electrode arranged in metal body provided with windows so that the windows are opposite to space defined by positive and negative electrodes. Electrode system has positive electrode current distributor insulation means. Negative electrode is connected to body bottom. Positive electrode is shaped as cone directed so that electrode apex faces negative electrode. Insulation covering is applied to positive electrode cone side and base surfaces. Body may support positive electrode cone base. Besides, positive electrode cone side and base surfaces may be formed as corrugated members. Insulation covering of the cone may be produced of elastic material. Transversal positive electrode dimensions and mass may be an order greater than that of current distributor. Blind hole may be formed in positive electrode cone apex or cone apes has tip made of erosion-resistant material.

EFFECT: increased electrode system resistant to hydrostatic and pulsed hydrodynamic pressure action and increased service life of electrode system.

6 cl, 3 dwg