Structural Design and Evaluation of High Strength Thread of Mandrel Hanger
In order to prevent failure accident caused by the insufficient strength of the connecting thread at the lower end of the mandrel,the mechanical property experiment of the mandrel material is carried out by using the design and calculation method of high temperature and high pressure of casing string,finite element numerical simulation and experimental means,and a high-strength thread structure for the mandrel hanger is developed,and the finite element calculation of three-dimensional of the thread is carried out under the ultimate composite load.The compression load has a great influence on the stress of the first tooth of the internal shoulder of the internal thread,and the rest of the internal and external thread is relatively safe.The tensile load alleviates the influence of makeup torque on the shoulder of internal and external threads to a certain extent.From the calculation results,it is concluded that the overall stress of the internal and external threads is less than the allowable yield limit of the material,and the contact pressure of the threaded joint is greater than the external fluid pressure,which can form an effective seal.The research results provide a theoretical basis for the selection and use of the threaded structure of the mandrel hanger.
mandrelthreadhigh strengthcomposite loadfinite element
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