Improving of the Probing Signal’s Spectral Content for Devices Nuclear Magnetic Logging

The method of nuclear magnetic logging (NML) allows to distinguish easily enough the intervals in which there are hydrocarbons and forecast their extraction. Moreover, principles measuring using this simple enough, despite difficulties processes. There were described improving spectral composition probing voltage NML device article. disadvantage is that resonance area covers all reservoir fluids. Therefore, search for a way reduce frequency spectrum extend range rather urgent task. In article stated within conducting researches necessary signals large capacity. case, it more appropriate use switch mode power converters. system multilevel inverter created on base these converters get signal simply enough. A three-level generates high-frequency pulses considered. virtual model converter constructed together with smoothing resonant filters, generate (NMR) devices, modified Carr-Purcell-Meiboom-Gill sequence. result wide voltages side harmonics, have significant influence output relative NMR tuned. analysis harmonic conducted. Calculations intermodulation distortion coefficients first two harmonics given. To quality measurement by proposed implement additional generators phase difference between initial will be half period. inductors used transformers ratio primary secondary windings 1: 1 winding has same value inductance as replaced coil was without modifications. Anti-phase connected windings. additionally implemented galvanic isolation generator main signal. As simulation such obtained an alternative After calculations comparison coefficients, shown really improves disadvantages improvement considered well. case 30 ohms load calculated. results show ~ 2.68 times. With method, possible dampen unwanted adjusting frequencies phases so always running antiphase.