Effect of Middle Tension on Dynamic Behavior of Marin Risers

Abstract

Oil extraction in deep waters requires the use of specialized equipment and tools that enable safe activity in the deep. Amongst this specialized equipment is the semi-submersible platform, which is held still in the desired position through the use of cable and chain mooring. Another important component is the riser, which is a cylindrical beam used to connect the wellhead to the platform. This study includes the mathematical modeling of a typical riser and an analysis of its vibration in two planes due to platform motion, waves and current. In addition, the effects of middle tension and variation in mechanical and environmental parameters on the dynamic behavior are considered.