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Riser
The riser is a pipe that extends from the drilling platform down to the seafloor. Drilling mud and cuttings from the borehole are returned to the surface through the riser. The top of the riser is attached to the drillship, while its bottom is secured at the seafloor. A blowout preventer (BOP) placed at the seafloor between the wellhead and the riser provides protection against overpressured formations and sudden release of gas. The riser pipe diameter of up to 21 in. [53.3 cm] is large enough to allow the drillpipe, logging tools and multiple casing strings to pass through.
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