| Popis: |
In order to enhance the sealing performance of rubber core in ram blowout preventer, this paper designed a new structure of the rubber core which embedded a half-PTFE ring in the central of rubber core based on the characteristics of failure mode on the contact surface. Through carrying out the experiment on the rubber under different temperature and pressure to determine the constitutive relation of the rubber core, this paper has established the 3D model of rubber core and drill pipe, accomplished the contact finite element analysis under 20MPa and compared with the general rubber core. The results show that in the contact surface between the new rubber core and the drill pipe, the whole rubber core is in stress concentration area, and the contact stress is bigger than the values of normal core with the drill pipe. When the well blowout occurred, it will have a greater sealing pressure between the PTFE ring and the drill pipe, which plays a greater role in blowout control. For the small friction coefficient between PTFE ring and drill pipe, the scuffing is reduced from the drill pipe and the service life of rubber core is extende |
