A packing sealing structure suitable for heating cable blowout preventers has been proposed as a means of achieving the purpose of high-pressure blowout prevention at the wellhead.The packing ring,which forms part of the packing sealing structure,is pre-installed by compressing the pressure valve.This achieves the purpose of sealing the fluid inside the cavity.Firstly,a theoretical model of the packing seal structure was constructed,and the mechanical behaviour of the packing ring during the compression deformation stage and fluid infiltration stage was analysed.Subsequently,a two-dimensional axisymmetric model of the packing seal structure was constructed using finite element software.Finally,an analysis was conducted to determine the variation law of the packing ring under different compression loads and fluid pressures.The findings indicate that the maximum stress-strain of the packing ring increases with the rise in compression load under varying compression loads.When the load exceeds 15 MPa,the strain region begins to shift downwards.The contact stress on the sealing surface demonstrates a decreasing trend along the axial position,increasing with the increase of compressive load.As the fluid permeation load rises,the fluid gradually penetrates upwards from the sealing surface,and the contact length continuously decreases.
关键词
加热电缆/填料密封/有限元分析/流体压力渗透
Key words
heating cable/packing sealing/finite element analysis/fluid pressure permeation
维普
万方数据