ELECTRODE SYSTEM OF ELECTROHYDRAULIC DOWNHOLE DEVICE (VERSIONS) Russian patent published in 2011 - IPC E21B43/24 H01T9/00 

FIELD: electricity.

SUBSTANCE: electrode system contains positive and negative electrodes arranged coaxially opposite each other in metal housing with openings located opposite interelectrode gap, current lead to positive electrode; at that, negative electrode is connected to the housing bottom; positive electrode is made in the form of massive cone directed with its top to negative electrode; in the cone top there fixed is a tip from erosion resistant metal; insulating coating is applied to side surface and bottom of cone of positive electrode and current lead to it; housing is made so that cone bottom of positive electrode can be borne against it. As per the first version of the proposed device the negative electrode is made in the form of a rod; side surface of negative electrode, which faces the housing, is coated with insulating material; at that, diameter of projecting part of negative electrode is equal to or is less than tip diameter of positive electrode. As per the second version of the proposed device the negative electrode is made in the form of a cone or semi-sphere, the tope or pole of which faces the positive electrode; the whole surface of negative electrode, which faces positive electrode, is coated with insulating material; tip of positive electrode is located near or touches the insulator of negative electrode.

EFFECT: increasing the amplitude of blast wave and its stabilisation.

5 cl, 4 dwg