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Pump screw pump wells sunk must guarantee a certain depth , in order to play a better effect . When the fluid level is reduced to the pump setting depth , pump efficiency reduce serious burned stator phenomenon occurs , the problems lie well . In addition , part of the pump under watered well need to improve watered effect by controlling the fluid level . Therefore, the nominal value of the determination of dynamic solution to control the dynamic liquid level of reasonable development of oil fields , enhanced oil recovery rate is of great significance . Fluid level measurement by manual operation , the artificial signal interpretation . Its data to calculate the finishing work is tedious , error , low degree of automation , and low efficiency . This article on the shortcomings of the domestic oilfield fluid level measurement system analysis and design based on the the MSP430 MCU as the core of the closed-loop control system . The paper presents the overall design of the program , the use of mechanical the aeroelastic device as a sub-sonic signal source . The hardware circuit including the power supply circuit , motor reversing control circuit , the signal input and the filter circuit , CPU and memory circuits , touch screen and LCD module and TTL to RS232 circuit , the main achievement pinger , data acquisition, data processing and storage , interface display and remote communications . The procedures for the preparation in accordance with the completion of the design ideas , sampling and digital filtering, fast Fourier spectrum analysis , calculating the fluid level in the interactive interface , and closed-loop control functions . Signal processing aspects of using digital filtering , the choice of the method of frequency domain analysis , spectral analysis using the fast Fourier transform . Combined with the position of the liquid surface echo and the propagation velocity of acoustic waves in the tubing in the calculated level value . Obtained by determining the level value anomalies , choose a reasonable working system . By the microcontroller , the system replaces the traditional analog filters and micro- controllers , measurement data is not lost long-term preservation , programming convenience, flexible parameter settings , the use of digital signal processing . Therefore , the system is stable and reliable , and increase the degree of automation and measurement accuracy . The system uses a closed-loop control , timely reflect the unusual circumstances of the fluid level , pump systems of work and a reasonable choice . Intelligent regulation , enhanced oil recovery and reduce the purpose of lying well .
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