A comparative analysis of 21 inch and 16 inch drilling riser for deepwater application
MetadataShow full item record
When offshore drilling needs to be conducted in deepwater and ultra-deepwater area, a significant increase of weight to be accommodated by the drilling rig due to more riser joints and larger drilling mud volume becomes a challenge that has to be carefully looked after. However, with the growing technology of semisubmersible drilling rigs, drilling systems and methods, subsea and downhole systems, and so on, the deepwater and ultra-deepwater drilling operation has been more enabled than ever. This is supported by the fact that the world record for drilling depth has exceeded 10000 ft (3048 m) today. With more and more weight to be handled as the water depth goes deeper, and especially when heavy density drilling fluid needs to be used as well, drilling rig may arrive at a level where its capacities also need to be increased. Otherwise, it will not be adequate to fulfill the required parameters as stated by the regulating standards. A smart concept for drilling riser was then introduced with main objective to reduce the excessive weight resulted from deepwater application by replacing the conventional 21 inch diameter drilling riser with the slim 16 inch diameter drilling riser. As the weight and requirements related to this will be reduced, there is a possibility that the slim riser can be utilized further to even deeper water area without modifying existing capacities of the drilling rig, or even by using smaller capacity rigs.
Master's thesis in Offshore technology