Abstract
Drill ship is a ship-shaped structure with a drilling unit at its center and with oil compartments, which is moored and kept in position using anchors. These ships should be capable of working in deep sea for a long time, hence affected by harsh ocean environment. Drill units are said to have greater heave motion, and the height of the derrick influences the vessel’s stability. MARPOL Oil Outflow Analysis is performed for damaged crude oil carriers or tankers and Mobile offshore drilling units (MODU) in damaged condition. In the present study, probabilistic analysis is performed on drill ship to understand its stability behavior under damaged condition. Stability assessments are carried out by considering single and multiple damage locations. Oil outflow analysis is carried out for different damage cases of oil tank. Probabilistic damage assessment is done for load cases up to 50% flooding, to obtain stability charts. These charts will be useful to understand variations in stability parameters under damaged conditions.
Highlights
Drill ships are designed for drilling of oil reservoirs to extract oil and natural gas in deep sea
The present study aims to prepare the stability chart for the damage condition of the drill ship, which will be an effective tool to evaluate the final stability and serviceability of the ship in probable damage cases
The probabilistic damage stability analysis was done to predict the effect of tanks and compartmental arrangement on stability
Summary
Drill ships are designed for drilling of oil reservoirs to extract oil and natural gas in deep sea They have drilling platform, derrick, and moon-pools on hull to drill up to a depth of 3,200 m. Risers, and strings are used to keep the drilling platform stable Their response and stability parameters are highly critical in these ships. Drill ships have mud carrier tanks, oil tanks and brine tanks which affect its stability under intact and damaged condition. The oil carrying containers are designed in such a way that the external pressure is lower than internal pressure This helps to prevent water ingress from the sea, but it promotes oil outflow. The present study aims to prepare the stability chart for the damage condition of the drill ship, which will be an effective tool to evaluate the final stability and serviceability of the ship in probable damage cases
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