Emergency Disconnect |
 
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Emergency Disconnect |
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This portion of the example simulates an emergency disconnect scenario, following failure of the dynamic positioning system on the drillship. In such situations, the riser is quickly disconnected from the wellhead to prevent any potential damage. Simulation of riser recoil is achieved by initially modelling the riser in the connected mode, before suddenly removing the boundary conditions at the base of the riser. This allows the BOP and the LMRP to move freely in all degrees of freedom. The main objective of this analysis is to compute the motion of the base of the riser immediately following disconnect.
Note: Although Flexcom can provide an approximate simulation of the disconnect event and subsequent riser recoil, a more comprehensive simulation may be performed using our DeepRiser software, which specialises in the analysis of top-tensioned risers. DeepRiser provides a detailed hydro-pneumatic tensioner, which models all the major hydraulic and pneumatic components. It can model each tensioning cylinder independently, and can simulate the behaviour of the anti-recoil control system.
