Conduits to transfer materials from the seafloor to production and going facilities atop the water's surface, along with from the facility to the seafloor, subsea risers are a type of pipeline designed for this sort of vertical transportation. Whether serving as creation or import/export vehicles, risers are the connection between the subsea field developments and creation and drilling facilities. Just like pipelines or perhaps flowlines, risers transport made hydrocarbons, along with production materials, such as treatment fluids, control fluids and gas lift up. Usually protected to withstand seafloor temperatures, risers can be either rigid or perhaps flexible.

Types Of Risers

There are a number of types of risers, which include attached risers, pull tube risers, metallic catenary risers, top-tensioned risers, riser podiums and flexible riser configurations, along with drilling risers.

The first type of riser to be produced, attached risers are used on fixed platforms, compliant towers and concrete gravity structures. Attached risers will be clamped to the side of the fixed facilities, linking the seabed to the production facility above. Usually fabricated in parts, the riser section nearest to the seafloor is merged with a flowline or foreign trade pipeline, and clamped aside of the service. The next areas rise up the side of the facility, until the best riser section is merged with the control equipment on top of the facility.

Also used on fixed set ups, pull conduit risers will be pipelines or flowlines that are threaded in the center from the facility. To get pull tube risers, a pull tube with a diameter wider than the riser can be preinstalled on the facility. Then, a wire rope is definitely attached to a pipeline or perhaps flowline around the seafloor. The queue is then ripped through the pull tube for the topsides, using the pipe along with that.

Building on the catenary formula that has helped to create connections across the world, steel catenary risers use this shape...