测井仪器外壳井下承压强度有限元分析OA

In order to ensure that the oil logging instrument shell can effectively protect the internal instrument under the condition of high temperature and high pressure in the downhole,and meet the requirements of safe use,this paper takes a single type of oil logging instrument shell as the research object,and carries out systematic test and simulation analysis.First,a comprehensive material property test is carried out on each component of the instrument shell by combining experimental test with finite element simulation.The key mechanical properties of the material under simulated downhole high temperature and high pressure environment are systematically tested,and the mechanical response characteristics and variation rules of the material under extreme working conditions are clarified.On this basis,combined with the actual working conditions of the downhole,a finite element model for the strength analysis of the casing of the logging tool is established.Through the simulation analysis system,the equivalent stress distribution characteristics of the shell of a single logging tool under the downhole high temperature and high pressure conditions are explored,and the potential weak parts of the shell are accurately located.The results show that the weak parts of the shell are concentrated in the structural geometric mutation area,where the equivalent stress level is high and there are structural safety hazards.Aiming at the weak parts,the structural local optimization design scheme is adopted to improve the structure.After optimization,the equivalent stress of the weak parts is significantly reduced to the allowable stress range of the material,the overall stress distribution uniformity of the shell is obviously improved,and the bearing capacity of the structure is effectively enhanced.It is concluded that the method of combining material test and finite element simulation adopted in this paper is feasible and effective.The obtained material performance parameters,stress distribution law and optimization scheme provide reliable theoretical basis and technical support for the structural design,strength check and optimization improvement of the shell of similar logging tools.