... Abstract On a floating vessel or rig, heave can cause severe disturbances in the returning mud flow from the marine riser into the Flow Line. This effect is due to the changing height of the outflow point of the marine riser with respect to the sea bed. Thus the heave can be considered...

... and thruster pack and a 3 urface heave compensated handling system 3 . The complete package was first operated in a land test well at Livingston, Scotland. It was then deployed onto a dummy wellhead in the North Sea, beneath the North Sea Pioneer in 385 ft (126.3 m) of water without the use of guidewires...