Downhole Acoustic Signal Simulator for Self Inspection of Dynamic Liquid Level Measuring Instruments
In the development and testing process of the downhole dynamic liquid surface gauge by acoustic wave method,the acoustic wave experiment of the instrument generally needs to be completed at the oil extraction site,and the process consumes a lot of manpower and material resources,which leads to the problems of long research and development cycle of the gauge,and low efficiency of self-test.Therefore,an editable acoustic signal simulator was designed to replace the acoustic source and acoustic sig-nal channel in the pumping wellbore,so as to achieve the purpose of off-site testing or self-testing of gauges.The time-domain characteristics of acoustic wave propagation in the downhole annulus were analyzed by COMSOL modeling simulation,which was used as the basis for editing the excitation waveforms of the simulator for the gauge.The simulator adopted direct digital frequency synthesis technology,and the edited sound signal was output through the loudspeaker to stimulate the microphone in the gauge to achieve its self-test purpose.Comparing the waveforms obtained from the indoor test of the measuring instrument and the wave-forms designed by the simulator,the time-domain parameters of the two are basically the same,and the above results verify that the simulator can meet the demand of off-site self-test of the measuring instrument.
万方数据
维普
