耐高温热示踪流速测量仪设计

Design of High-temperature Heat Tracing Flow Rate Measuring Instrument

油田进入开采中后期,流体黏度增大并携带砂砾易造成涡轮流量计卡轮,热示踪法是解决此问题的有效方法。但随着勘探技术的发展,井内温度不断递增,现有热示踪流速测量仪不能满足高温工况下测量要求。针对此问题,提出一种耐高温热示踪流速测量仪设计方法。采用遗传算法优化元器件空间热布局,增设管外流体及翅片散热器进行电路散热,开展耐高温热示踪流速测量仪仿真性能验证并制作样机。仿真结果表明,在125℃的工况下,电路布局优化后的最高温度由222.19℃降至196.09℃,利用管外流体与翅片散热器进行散热后,电路最高温度进一步降至133.53℃,降幅总计高达39.91%。高温测试平台试验表明,高温试验前后流速最大相对偏差仅为1.7%,测量精度基本无变化,故该热示踪流速测量仪可在125℃工况下工作。

When the oil field enters the middle and late stage of exploitation,the fluid viscosity increases and the carried sand can easily cause turbine flowmeter jamming.Heat tracing is an effective method to solve this problem.However,with the development of exploration technology,the temperature in the well is increasing,and the existing heat tracer flow rate measurement instruments cannot meet the requirements of high-temperature measurement.Aiming at this problem,a high-temperature heat tracer flow velocity measurement design method is proposed.It is conducted using genetic algorithms to optimize the spatial heat layout of components,adding fluid outside the tube and fin radiators to dissipate heat from the circuit,conducting simulation performance verification of high temperature resistant heat tracer flow velocity meters,and making a prototype.The simulation results show that under the operating condition of 125℃,the maximum temperature after circuit layout optimization decreases from 222.19℃ to 196.09℃.After using the fluid outside the tube and the fin radiator for heat dissipation,the maximum temperature of the circuit further decreases to 133.53℃,with a total decrease of 39.91%.The high temperature test platform experiment shows that the maximum relative deviation of the flow rate before and after the high temperature experiment is only 1.7%,and the measurement accuracy is basically unchanged.Therefore,the heat tracer velocity measuring instrument can work in 125℃conditions.