Deepwater drilling is under continuous development with ever evolving design requirements for rigs as a consequence. The need to drill deeper and longer wells, in always increasing water depths, and to perform well completions in always more complex wells has had its effect on the rig functional demands and has led to bigger sized and heavier equipment and consequently larger ships. These new rigs need to be ready to apply the new and advanced drilling techniques and to keep up with the growing safety standards.

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