Rapid Test Method and Realization of Vacuum Failure of Vacuum Flask
The logging tool is used to detect underground oil and gas resources,facing a downhole environment of up to 200℃.To prevent internal electronic devices from overheating and failure,vac-uum flasks are used to insulate them.However,due to harsh environments such as high temperature and pressure,corrosion and vibration underground,as well as the complex internal structure and limited welding strength of the vacuum layer of the vacuum flask,there is a risk of vacuum failure.Therefore,it is necessary to inspect the vacuum flask before operating in the well.In response to this issue,this paper first designed a rapid inspection device for vacuum failure of the vacuum flask,determined the judgment index P value,verified the stability of P value through numerical simu-lation,and calculated the critical value Pe of 0.351 for judging the normal and vacuum failure of vacuum flasks.Subsequently,a testing bench was built for experimental verification,and the results showed that the P-value error before and after vacuum failure did not exceed 10％,indicating good stability.Finally,the control system of the device was integrated and designed to achieve rapid and accurate judgment of vacuum failure of vacuum flask.
NETL
NSTL
万方数据
