Hydrodynamic processes in chambers of electrical discharge facilities for treatment of oil boreholes

Summary form only given. A theoretical investigation of hydrodynamic processes in chambers of electrical discharge facilities which are applied to pulse oil borehole walls treatment to increase their permeability has been carried out. The system of equations describing the processes in chambers consists of hydrodynamics equations for an ideal compressible liquid supplemented with boundary conditions on the chamber and the electrical discharge channel surfaces. The connection of the electric circuit parameters with discharge channel characteristics is given through the equation for energy balance in the channel. The shape and dimensions of calculated fields correspond to constructions of real electrical discharge facilities. It allows analysis of the influence of not only energetic parameters of the facilities but their design peculiarities on hydrodynamic processes. Application of numerical methods based on the use of moving non-orthogonal grids allows observation of the channel surface motion and calculation of field shape changes with the necessary precision of the obtained results. The influence of stored electrical energy, discharge duration, hydrostatic pressure, dimensions of chamber constructive elements on the hydrodynamic processes in discharge chambers is studied. The profiles of pressure waves effecting on the borehole walls are determined.