Definition - What does Flexible Riser mean?
A Flexible Riser is a flexible pipe that transfers materials from the seafloor to the drilling and production facilities and from the facilities to the seafloor as well. It is a hybrid that is capable of accommodating a wide number of different situations that withstand both horizontal and vertical movement; hence it is ideal for use with floating facilities. Flexible Risers were originally used to connect the production equipment embarked on a floating facility to export and produce risers.
There are a variety of configurations for the Flexible Risers which includes lazy S and steep S that use anchored buoyancy modules. They also use lazy wave and steep wave which incorporate buoyancy modules.
Petropedia explains Flexible Riser
Flexible Risers are flexible pipes that have been a successful solution for shallow and deep flowline systems worldwide. These are the subsea risers that are developed to carry out this type of vertical transportation. They serve as import or export and production vehicles connected between the drilling and production facilities and the subsea field development. Like pipelines, the risers also transport the produced hydrocarbons, control fluids, injection fluids and gas lift.
They are the enabling technologies used for floating production in harsh environmental conditions. They encompass a layered structure with various materials having different functions like withstanding internal and external pressure, preventing leaks of hydrocarbons, coping with tensile forces and protection against the seawater.