High temperature permanently installed down-hole data acquisition system is the supplementary data monitoring system of electric submersible oil pump, to achieve real-time monitoring of oil well production; it is significant for predicting the faults, improving the operating efficiency of electric submersible oil pump, and optimizing the production plan. In order to make the data acquisition system can be used in down-hole high temperature environment to ensure good reliability, and the electronic devices can be operated with long-term reliability, the advanced high temperature electronic components at home and abroad are selected for designing the hardware circuitry. By using the conditioning circuit, the voltage ranges of collected signals are conditioned to the range that the circuitry design requests. In order to detect multiple parameters of down hole, through programmable control of single chip computer, the sampling signals are output by analog multiplexer in time sequencing, and the voltages are converted into current signals by V/A conversion circuit, and transmitted to the ground by 3-phase cables, thus the underground environment temperature, pressure, outlet pressure of the pumps, and the motor winding temperature, etc., can be monitored in real time on the ground. By comparing and analyzing the signal waveforms collected from down-hole and on the ground, it is found that the data on the ground can reflect the changes of data of down hole. The simulation experiments and field applications show that the system designed meets the requirements of real-time monitoring of submersible oil pumps.%高温永置式井下数据采集系统是潜油电泵配套井下数据监测系统,能够实现对油井生产状态的实时监测,对采油系统的故障预测、提高潜油电泵运行效率、优化采油方案具有重要意义.为了使数据采集系统能够在井下高温环境中具备良好的可靠性,保证电子器件能够长期可靠运行,选用了高温电子元器件进行硬件电路设计,利用调理电路将采集信号调理为电路设计所需要的电压范围.为了实现井下多参数的检测,通过高温单片机程序控制模拟多路开关分时输出采样信号,并将信号通过电压电流转换电路转换成电流信号,利用三相电缆传输到地面,实现了地面对井下环境压力、环境温度、泵出口压力以及潜油电机绕组温度等参数的实时监测.通过对比分析井下、井上信号采集波形,井上采集的信号,得到井下采集数据的变化情况.模拟试验及现场应用表明,所设计系统能够满足潜油电泵实时监测相应数据的要求.
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