Optimized Design of Insulation Protection Cabin for MGD Passive Magnetic Steering Tool
The solutions for normal operation of logging tools at high temperature of 175℃and above focus more on insulation.Vacuum flasks and multilayer insulation materials are usually used to isolate the entry of exter-nal heat.Scholars design vacuum flasks mainly based on theoretical formulas and empirical coefficients,and there is rare study on the temperature field of vacuum flasks by numerical simulation.In this paper,based on the struc-ture of the magnetic probe and the parameters of the vacuum flask,together with temperature field coupling,the variation of the temperature field of magnetic steering tool over time were analyzed.The results show that the probe sensor needs to work for 8-10 hours underground at around 175℃,where the lengths of the upper and lower heat insulators should be 150 mm and 50 mm respectively,and the lengths of the upper and lower heat carriers should be 150 mm simultaneously.The increase of the heat carrier volume can extend the maximum working time,and the heat carrier volume should be reasonably determined by considering the factors such as working time,suitable working temperature of the sensor and external dimension of the insulation protection cabin.The research conclu-sions provide a theoretical basis for the design of insulation protection cabin for magnetic steering tool.
logging toolpassive magnetic steeringinsulation protection cabinvacuum flasktemperature fieldnumerical simulation
万方数据
维普
