海洋钻井平台PPT课件.pptx

Classes of offshore rigs
2 classes
Bottom Supported
Floating
Bottom Moored
Dynamically Positioned
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Bottom Supported Rigs
Submersibles
Barge design
Column design
Jack-ups
Mat supported
Independent leg
Slot type
Cantilever type
Platforms
Steel jacket
Gravity structure
Hybrid structure
Compliant tower
Tension leg platform
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Floating Rigs
Bottom Moored
Drilling tender
Drilling barge
Drill ship
Conventionally moored
Turret moored
Semi-submersible
Spar/Truss
Dynamically Positioned
Drill ship
Semi-submersible
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Submersible: Barge
6m water
Sits on bottom
Used in still waters (not rivers)
Derrick can be levelled
Deck may sit on posts above barge to allow barge to be fully submersed
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Submersible: Island
Floats in
Ballasts to sit on seabed
Inside is filled to give artificial ground level
Designed for ice conditions
Supplied by ice-breaker ships
. Sakhalin, Caspian Sea
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Submersible: Column design
25m water
Cantilevered derrick
Triangular or square deck
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Jack-up: Mat supported
3m minimum water depth
Carries it’s own foundation
Needs flat seabed
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