Date post: | 30-Jul-2015 |
Category: |
Business |
Upload: | informa-australia |
View: | 100 times |
Download: | 0 times |
Offshore Support vessels
A Historical Perspective, Trends and Developments
Capt. Bruce Dann
What are they? And what do they do?
An Offshore Support Vessel can be defined as any vessel that floats and provides support services to the Offshore Industry.They can be any size, shape, conversion or purpose built.
The Beginnings of drilling off the shore
Beach at Summerland California early last century
Early Drilling Louisiana
Early drilling Offshore Ohio
Vessels in use at the Start of the Offshore Industry
SubmersiblesFirst purpose built MODU 1954Submersible ‘Mister Charlie’
Drilling RigsEarly Semi Submersibles
Drillships
First Semi ‘Bluewater 1 converted from a submersible in 1961
Gus 1 first real Jackup 1954Rated for 100 feet
Supply Vessels
M.V. ‘Ebb Tide’ 1956 first purpose built supply vessel
EBB TIDE and the vessels that followed were notable for a number of specialised capabilities and fit out some of which remain today.
• Bridge and accommodation far forward allowing a long after deck for Drill pipe.
• Low aft funnels allowing good visibility for the ship handler and for the cargo to be swung over the deck.
• Twin Propellors
• Powerful Engines (For the day) allowing good manoeuvrability and speed to the rig.
• Open Cargo deck allowing easy cargo stowage.
Derrick Barges
MacDermott DB17DB George R. Brown
Main Types of Offshore Support Vessels in use today and their Development
AHTS (Anchor Handling Tug Supply)
PSV (Platform Supply Vessel)
MODU (Mobile Offshore Drilling Units )
-Jackups (Self Elevating Platforms)
-Semi Submersibles or Semi Subs
-Drillships
Derrick Barges and Heavy Lift Construction vessels
Heavy lift Semi Submersible Transport Vessels
Pipelay Vessels-Rigid Pipe Lay-Flexible Pipe Lay
Specialised Offshore Support Vessels-DSV (Dive Support Vessels)-Multi Purpose Offshore Support Vessels-Seismic Survey Vessels-Floatels (Floating Accommodation Vessels)
Main Types of Offshore Support Vessels in use today and their Development
AHTS
Development stages of AHTS
First Generation
Second Generation
Second Generation
Ulstein 704 (late 70’s)
AHTS continued
Third Generation AHTS
AHTS continued
AHTS continued
Fourth Generation Vessels
New VesselsMost new Vessels have a layout similar to thisNote:
Engine room forwardDrop down bow thruster.Very large winchRail CranesDP2 ClassClean classComfort ClassStern ThrustersHigh Efficiency RuddersTwin sets tow pins and stoppersSplit RollerGirding Hooks right aft360 degree wheelhouse
AHTS continued
Examples of new high capacity AHTSOften over 200 tonnes B.P.Over 20,000 B.H.P.
AHTS continued
PSV
First generation PSV
This vessel was fitted with the original Kongsberg DP System
Second Generation PSV
Late 70s and early 80s
PSV continued
Third Generation PSV
PSV continued
PSV continued
New PSV’s
Jack Up drilling Rigs
Semi Submersible Drilling Rigs Development
The ‘Ocean Digger’ was built in Whyalla in 1967
The ocean Endeavour was built in Perth in 1975
‘The Ocean Epoch’ was built in Mobile Alabama in 1976
These are examples of earlier semi-subs the following slides show the development of this type
Earlier models (upgraded) above
Modern form below
Semi Submersible Drilling Rigs
Modern Semi-subs in Service Today
Semi Submersible Drilling Rigs
DRILLSHIP DEVELOPMENT
The ‘Regional Endeavour’ at left was converted in Newcastle N.S.W. in the mid 1970’s from the Bulk Carrier ‘Mount Kembla’
The ‘Jack Ryan’, left, is a fully DP controlled deep water unit
DRILLSHIP DEVELOPMENT
DRILLSHIP DEVELOPMENT
New Drillships
Heavy Lift Semisubmersible Transport Vessels
MacDermott DB 101 is a mono hull semi with Crane S.W.L. of 2,500 Tons (above)
Heerema’s Hermod (1976) is a catamaran semi with twin crane S.W.L. of 9,000 Tonnes.
Derrick Barges and Heavy Lift Construction Vessels
The Saipem 7000 (left) is the largest of these vessels currently in service with 2 x 7,000 tonne S.W.L. cranes.
Derrick Barges and Heavy Lift Construction Vessels
Pipe Lay Vessels: Rigid steel Pipe
Reel Vessel Apache built 1970’s still operating
Saipem Semi sub pipe lay vessel
D.B. 29
‘Solitaire’ Large Deep Water rigid pipe laying vessel
‘Casterone’ Largest and most modern Rigid pipelaying vessel
Pipe Lay Vessels: Rigid steel Pipe
Casterone the largest rigid pipelayer
Flexible Pipe Lay
Flexible Pipe Lay
FPSO (Floating Production, Storage and Offloading )
SPECIALISED OFFSHORE SUPPORT VESSELS AND THEIR DEVELOPMENT
Purpose built DSV’s began to appear in the early 1980’s
Dive Support Vessels (DSV)
Both these vessels were converted from DSV’s
Both were built in the early 1980’s and still operate today.
Multipurpose Offshore Support Vessels
Modern multipurpose offshore support vessels
‘Far Samson’ currently the highest power and bollard pull Offshore Support vessel.
Bollard pull >430 tonnes continuous
Almost 50,000 horsepower
Modern multipurpose offshore support vessels
Seismic Survey Vessels
Floatels (Floating Accommodation Vessels)
Summary
Offshore Vessel Types
It can be seen from the previous slides that almost all types commenced service as conversions from older units.
Except: submersibles and Jack ups
After conversions proved their worth the various types began to be purpose built and therefore more suited to the task at hand.
Today there are almost no conversions.
Development Requirements for Increasing Water Depth and Harsh Environments
• Diver-less Engineering increasingly necessary
• Increasing ROV Capability
• Even Larger and more powerful vessels than are in use now
• Further development of DP Capabilities
• Almost exclusive use of Sub-sea Production Facilities
• Greater reliance on large PSV’s for supply services
Future Directions
Ship Handling simulator
Arctic FPSO concept
Even Greater Investment in Safety of Personnel, the Environment and Equipment
Future Directions
Dismantling of Old Offshore StructuresFuture Directions
The vessel below is currently under construction as a purpose built vessel to undertake this important work
Concept Vessels for future deploymentFuture Directions
Future Directions
TROLL A PLATFORM The “Troll” platform is the tallest Concrete Gravity Structure (CGS)
so far constructed for use in the offshore industry.
The platform consists of the gravity base structure with 19 base cells, from which 4 shafts extend to support the deck structure. The
overall dimensions are:
DECK Length 176.2m
Width 54m
Weight Approx 22,500 tonnes
Height 81m (to top of drill tower)
BASE Length 161.0m
Width 143.9m
HEIGHT CGS (from top of skirts)
369.4m
Deck Structure 81m
Total Height 450.4m
TOWING DRAFT Inshore 227m
Offshore 227 – 278m
DISPLACEMENT Total 1,027,500 tonnes
THANK YOU FOR YOUR ATTENTION