This paper discusses the design and results of extensive prototype testing of an all metal sealing, weight set, 18-3/4"-15,000 psi subsea wellhead system. This system (Figure 1) has been developed to meet industry requirements of higher pressure and higher temperature in critical applications.
Since the all metal-to-metal sealing packoff is critical to the reliability of the system, emphasis is given to its design and testing. Seal energization and retrieval forces are minimized by the unique seal design. Additionally, the development of an alternative elastomer packoff for use when all metal sealing is not required is discussed. The computer optimized hanger design addresses the need for increased system capacity.