In view of the failure of the sealing structure of mandrel hanger under high pressure and extreme temperature environment, according to the sealing structure characteristics and application requirements of conventional mandrel hanger, based on the principle of the minimum sealing pressure ratio of metal sealing surface and the constitutive model of rubber material, the advantages and disadvantages of three conventional sealing structures are analyzed and compared. Based on the heat conduction theory and the energy conservation equation of thermal coupling, the transient temperature field model of the hanger seal structure is established. The heat transfer analysis and thermo-mechanical coupling calculation of the new metal seal structure are carried out at extreme temperature. The results show that the contact pressure on the double U and single U sealing rings is greater than 140 MPa at extreme temperature, which meets the principle of minimum sealing pressure ratio. The temperature distribution law of the conventional rubber structure under the temperature and pressure load is analyzed, and the reason of early failure of rubber is found. The mandrel hanger of full metal sealing structure is used in the field. The mandrel hanger of full metal have been tested for more than 20 times of gas pressure. The pressure is stable and the sealing effect is good. The test results show that this new structure has the advantages of good seal performance.

针对心轴吊架在高温高压环境下的密封结构失效，根据金属心轴密封面的最小密封压力比和最大密封压力比的原理，根据常规心轴吊架的密封结构特点和应用要求。对橡胶材料的本构模型，分析和比较了三种常规密封结构的优缺点。基于热传导理论和热耦合能量守恒方程，建立了吊架密封结构的瞬态温度场模型。在极端温度下进行了新型金属密封结构的传热分析和热力耦合计算。结果表明，在极端温度下，双U型密封圈和单U型密封圈的接触压力均大于140 MPa，符合最小密封压力比的原则。分析了常规橡胶结构在温度和压力载荷下的温度分布规律，并找出了橡胶早期失效的原因。全金属密封结构的心轴悬挂器用于该领域。经测试，全金属心轴悬挂器的气压超过20倍。压力稳定，密封效果好。测试结果表明，这种新结构具有密封性能好的优点。分析了常规橡胶结构在温度和压力载荷下的温度分布规律，并找出了橡胶早期失效的原因。全金属密封结构的心轴悬挂器用于该领域。经测试，全金属心轴悬挂器的气压超过20倍。压力稳定，密封效果好。测试结果表明，这种新结构具有密封性能好的优点。分析了常规橡胶结构在温度和压力载荷下的温度分布规律，并找出了橡胶早期失效的原因。全金属密封结构的心轴悬挂器用于该领域。经测试，全金属心轴悬挂器的气压超过20倍。压力稳定，密封效果好。测试结果表明，这种新结构具有密封性能好的优点。