Abstract:

The paper presents a mechanical-pulse generator, which is connected to the coupling. By the pressure drop of the cementing, the generator converts the liquid kinetic energy into the pressure pulsation, flow field disturbance, sound wave field, and so on. It results in changing the downhole flow field and flow status when the energy field passes through the liquid and attenuates, and it improves the displacement efficiency. Making use of the signal software, we did the waveform and spectral analysis for the results of the pulse experiment of the mechanical -pulse generator in laboratory, and tested the dynamic pressure of its axis center by the pressure transducer and data collecting system. It was proved that the pulse efficiency of the mechanical-pulse generator is remarkable.

Key words: pulse generator, spectral analysis, cementing quality, flow field