高温井下测井仪热管理系统数值仿真分析

Numerical Simulation Analysis of Thermal Management Systemof High Temperature Well Logging Tool

测井仪常用于勘探深层地底下的油气资源分布,面临着高温的作业环境,其内部的电子器件在高温下往往失效烧毁。因此,石油行业需要对测井仪进行热管理设计。以往研究大多通过实验的方法探究测井仪的热管理效果,难以获得影响测井仪内部电子器件温度的关键因素。文章利用数值仿真方法得到测井仪热管理系统的温度分布,与实验结果对比,仿真的最大误差不超过5%,说明模型比较准确。随后利用控制变量法研究相变材料质量、电子器件功率和井下环境温度对电子器件温度的影响,研究结果表明,相变材料质量与电子器件温度呈负相关,电子器件功率与电子器件温度呈正相关,而井下环境温度对电子器件温度的影响相对较小。

Well logging tools are often used to explore the distribution of oil and gas resources in deep underground.Faced with high temperature operating environment,the electronic devices in the tool often fail and burn out under high temperature.Therefore the thermal management of logging tools is needed to be designed in the petroleum industries.Most of the previous researches explored the thermal management effect of logging instrument were basically through experimental methods,but it was difficult to obtain the key factors affecting the temperature of electronic devices inside the logging instrument.In this paper,we use the numerical simulation method to get the temperature distribution of the thermal management system of the logging tool.Compared with the experimental results,the maximum error of simulation is less than 5%,indicating that the model is accurate.Then the control variable method is used to study the influence of the quality of phase change materials,electronics power and downhole temperature on the temperature of electronic devices.The research results show that the phase changed material quality and the temperature of electronic devices were negatively correlated,electronic device power and electronics temperature were positively correlated,and the downhole temperature had relatively little influence on the temperature of electronic devices.