| A new metal seal assembly is needed to be designed in order to replace the original unstable rubber seal assembly because of the problem that the downhole condition has the tough features of high temperature and high pressure and highly corrosive environment with the substantial increase of oil exploitation depth. By referring to the relevant literature and data, this new metal seal assembly has been designed. The process of deformation and sealing is studied by using Abaqus software. Then size optimization of the metal seal assembly is carried out by using Isight software. The reference of the optimization result is verified by setting test. Mainly as follows:(1)The material of the metal seal assembly is chosen by the tough downhole condition. Then two different metal seal sleeve structure are designed. Main structure feature of these two sleeves and the sealing principle are introduced briefly. The structure that has a bigger radial deformation is better.(2) The deformation and stress of the seal assembly constrained by the outer casing are calculated by using finite element method. By using this method, the deformed shape of the sealing sleeve, the relationship between required applied load and surface contact stresses are determined. python language is used to make a secondary development of abaqus to establish a parameter model of the metal seal assembly, By using this method, the relationship between the seven structure sizes of the model and surface contact stresses?max PEEQ are determined.(3)Isight provided multi-objective optimization algorithm to optimize the important size of the metal seal sleeve. The structure that has been optimized is analyzed by using abaqus software and then make the setting test on this base. Test results show that a consistence between the relationship of applied load and pushing displacement and the simulation results is obtained,verifying the exactness of the parameters used in simulation. That verifies the feasibility of this structure elementarily. |
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