Large-Diameter Annular Blowout Preventer Packer Sealing Performance Analysis and Design
Conventional packer for annular blowout preventer(BOP)is often folded or torn during well con-trol.A packer suitable for large-diameter annular BOPs was designed.Based on the principle of virtual work and the constitutive equation of the Blatz-Ko material hyper-elastic model,a finite element model of spherical packer was established to simulate the process of packer deformation-sealing(incl.initial deformation,large deformation,and sealing contact)driven by the piston and thus clarify the sealing performance of the packer under different shear moduli and piston strokes.Moreover,the spherical packer was verified through tests subject to GB/T 20174-2019 and API 16A.The results show that the sealing performance of the spherical packer is greatly affect-ed by the shear modulus.As the shear modulus increases,the contact stress increases and then decreases,and the deformation decreases.In terms of the BOP structural parameters,with the increase of piston stroke,the con-tact stress and deformation of the packer increase.No leakage was observed at the seal during test,proving the qualified sealing performance of the spherical packer.The research method and results proposed in this paper pro-vide reference for designing BOP packer and improving its sealing performance.
annular blowout preventerspherical packersealing performanceprinciple of virtual workcontact stressfinite element simulation
NETL
NSTL
万方数据
