Experimental data on Single Pulsed Power Plasma Discharge Test for Fractures Initiation and Synchronized Diagnostics Using Electromagnetic Wave Method
The data of the researches describe experiments using 2kJ of stored energy achieved peak pressures of up 200 MPa (29,000 psi). These shockwave pressures were generated by typical plasma duration of 6-16.5 microseconds. Ionizable material aluminum was used as fusible link in the plasma discharge to introduce thermite ionic recombination reactions other than the original electrical pulse. Two groups of four cylindrical test samples were built under different conditions: water-to-cement ratio, wellbore size, and tubing perforations. Their purpose was to test the effect of the high-pressure shockwave over a range mimicking common rock properties and current completion methods. In all these experiments, the relevant electromagnetic fields were measured at some distance from the plasma. In both laboratory and near zone field applications where transient magnetic effects dominate, the techniques to measure dynamic magnetic fields are limited. Therefore flat induction search coils based on Faraday’s law were used to measure the time derivative of the magnetic fields generated. In order to compare with the experimentally measured data from the search coils the time derivatives of the simulated fields were calculated.