Pipe -in-Pipe Steel Catenary Riser Design for King Subsea Tie-Back to Marlin Tension Leg Platform.

摘要

This paper presents the steel catenary riser (SCR) design for the bp King development, a subsearntieback to the Marlin Tension Leg Platform (TLP), located in the Gulf of Mexico in Viosca Knoll Blockrn915. The water depth at the Marlin TLP is approximately 3,250 ft. (991 meter) and the subsea wellsrnare located approximately 17 miles (27 Km) south of the TLP in water depths ranging from 5,000 ft.rn(1,525 meter) to 5,500 ft (1,678 meter). Oil production from King will flow via dual, pipe-in-pipern(PIP) flowlines to PIP steel catenary risers (SCR) at Marlin TLP. Due to flow assurancernconsiderations, flowlines are actively heated with heated fluid circulating in the annulus and externalrninsulation for heat retention. The SCRs consist of an 8.625-inch (219-mm) OD flowline and 12.75-inchrn(324-mm) OD jacket pipe, and utilize titanium stress joints for a structural interface to the TLP. Thernflow path from piping on the TLP to the SCR annulus is through flexible jumper hoses clamped to thernstress joints. In the SCR, centralizers are installed to center the flowline in the jacket pipe as well as tornmitigate flowline helical buckling. Installation is scheduled in August 2001.rnOnce installed, this flowline will be one of only two hot-water heated flowline systems in the world andrnwill have the first PIP SCR in the offshore industry. This paper discusses the issues and challengesrnencountered in the PIP SCR design for this project, includingrn1. Constraints caused by using an existing SCR porch designrn2. Buoyancy requirements to limit hang-off loadrn3. Installation issues and use of centralizers to prevent helical buckling in the flowline pipern4. Numerical prediction of the dynamic response of the interface between the pipes in the PIPrn5. Wear between the flowline centralizers and the jacket pipes.