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barge to allow barge to be fully submersed
8 9/18/2020
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
5 9/18/2020
Bottom Supported Rigs
Submersibles Barge design Column design
Jack-ups Mat supported Independent leg
– Slot type – Cantilever type
6 9/18/2020
Evolution of Offshore Drilling Units
Instructor
ObLeabharlann Baiduectives
At the completion of this training module the engineer will: Clearly be able to define a rig type with the environment it is
– Removable if modularized
16 9/18/2020
Platform: Steel jacket
Up to 400m water depth Jacket installed by barge and
heavy lift crane Topsides installed as integrated
deck Fixed derrick Low weather downtime (cranes)
18 9/18/2020
Platform: Gravity structure
Up to 400m water depth 1,000,000 ton Floated into position – ballasted
Dynamically Positioned
Drill ship Semi-submersible
7 9/18/2020
Submersible: Barge
6m water Sits on bottom Used in still waters (not
rivers) Derrick can be levelled Deck may sit on posts above
13 9/18/2020
Jack-up: Slot
Works around a jacket Limited skid pattern Reduced deck space for
equipment Dimension of jacket critical
14 9/18/2020
Jack-up: Cantilever
i.e. Sakhalin, Caspian Sea
9 9/18/2020
Submersible: Column design
25m water Cantilevered derrick Triangular or square deck
10 9/18/2020
Jack-up: Mat supported
3m minimum water depth Carries it’s own foundation Needs flat seabed
12 9/18/2020
Jack-up: Independent leg
Up to 150m water depth Slot or cantilever designs
Platforms ▪ Steel jacket ▪ Gravity structure ▪ Hybrid structure ▪ Compliant tower ▪ Tension leg platform
Floating Rigs
Bottom Moored
Drilling tender Drilling barge Drill ship Conventionally moored Turret moored Semi-submersible Spar/Truss
best suited to List pro/cons for the many types of rig available
2 9/18/2020
Classes of offshore rigs
2 classes Bottom Supported Floating
– Bottom Moored – Dynamically Positioned
Works over jackets Rig floor elevates to clear the
top deck of the jacket Watch in Drilling office as in-fill
wells will have higher RTE
15 9/18/2020
Platforms
down Complete from float out Oil storage
19 9/18/2020
Platform: Hybrid structure
Upto 400m water depth Jack-up on top of a concrete
storage base Floated into position – ballasted
Up to 1000m water, but that is unusual Made from many materials or combinations Wells are very close to save costs Full facilities are permanent Rig has to be able to skid in 2 dimensions More than 1 derrick is possible
8 9/18/2020
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
5 9/18/2020
Bottom Supported Rigs
Submersibles Barge design Column design
Jack-ups Mat supported Independent leg
– Slot type – Cantilever type
6 9/18/2020
Evolution of Offshore Drilling Units
Instructor
ObLeabharlann Baiduectives
At the completion of this training module the engineer will: Clearly be able to define a rig type with the environment it is
– Removable if modularized
16 9/18/2020
Platform: Steel jacket
Up to 400m water depth Jacket installed by barge and
heavy lift crane Topsides installed as integrated
deck Fixed derrick Low weather downtime (cranes)
18 9/18/2020
Platform: Gravity structure
Up to 400m water depth 1,000,000 ton Floated into position – ballasted
Dynamically Positioned
Drill ship Semi-submersible
7 9/18/2020
Submersible: Barge
6m water Sits on bottom Used in still waters (not
rivers) Derrick can be levelled Deck may sit on posts above
13 9/18/2020
Jack-up: Slot
Works around a jacket Limited skid pattern Reduced deck space for
equipment Dimension of jacket critical
14 9/18/2020
Jack-up: Cantilever
i.e. Sakhalin, Caspian Sea
9 9/18/2020
Submersible: Column design
25m water Cantilevered derrick Triangular or square deck
10 9/18/2020
Jack-up: Mat supported
3m minimum water depth Carries it’s own foundation Needs flat seabed
12 9/18/2020
Jack-up: Independent leg
Up to 150m water depth Slot or cantilever designs
Platforms ▪ Steel jacket ▪ Gravity structure ▪ Hybrid structure ▪ Compliant tower ▪ Tension leg platform
Floating Rigs
Bottom Moored
Drilling tender Drilling barge Drill ship Conventionally moored Turret moored Semi-submersible Spar/Truss
best suited to List pro/cons for the many types of rig available
2 9/18/2020
Classes of offshore rigs
2 classes Bottom Supported Floating
– Bottom Moored – Dynamically Positioned
Works over jackets Rig floor elevates to clear the
top deck of the jacket Watch in Drilling office as in-fill
wells will have higher RTE
15 9/18/2020
Platforms
down Complete from float out Oil storage
19 9/18/2020
Platform: Hybrid structure
Upto 400m water depth Jack-up on top of a concrete
storage base Floated into position – ballasted
Up to 1000m water, but that is unusual Made from many materials or combinations Wells are very close to save costs Full facilities are permanent Rig has to be able to skid in 2 dimensions More than 1 derrick is possible