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Subsea wellhead systems
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Subsea wellheadsystems
The next generation inAker Solutions wellhead family
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Subsea wellhead systems
Illustration of a subsea wellhead
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Subsea wellhead systems
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Aker Solutions is a global leading supplier of engineering,
manufacturing, installation and life-of-field support of
subsea wellheads to the oil and gas industry worldwide.
We pride ourselves on delivering leading edge technology
and solutions to our customers.
Aker Solutions, in co-operation with our customers, develop
solutions that focus not only on cost efficient products and
tools, but also on optimisation of wellhead designs, drilling
and operational cost.
Aker Solutions views quality, simplicity and reliability in
design as fundamentals to the success of our business.
Our products and services include:
Wellheads
Hangers
Pac-offs
Tooling
Drilling connectors
Products and
services
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Subsea wellhead systems
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Subsea wellheads
Advanced wel lhead
technology
Aker Solutions is a world
leader in the design andmanufacture of subsea
wellhead systems
Key accreditations
Aker Solu tions holds
certificates of accreditation
for the use of American
Petroleum Institute 6A, 16Aand 17D, ISO 9001:2000and ISO 14001:2004.
Aker Solutions wellhead system is unique
amongst its peers.
It has an innovative hanger system which makes
it suitable for exploration and production in the
most extreme conditions and water depths.
The standard H4 prole wellhead complete with aVX/HX Inconel 625 gasket seal area, offers a fast,reliable well installation with exceptional load
carrying characteristics.
System features
High load capacity
Each casing load transferred directly to housingnot through single lower shoulder
Each pack-off can transfer 5.0 M.lbs loaddirectly into the housing
Total load capacity 10.7 M.lbs, the highest load capacity in the industry
Preferred load path method greatly reducesstack-up tolerances
System gives positive hanger lock down, essentialfor high temperature and production wells
Metal to metal annulus sealing system
High pressure capacity (15 000 psi)
Gas tight sealing
Does not rely on elastomer seal
Positive indication that seal is set prior to tool recovery
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Oceanuswellhead system(ultra rapid system)
The Oceanus wellhead system is based on
Aker Solutions standard field-proven design.
This system offers sufficient flexibility to
accommodate many specific needs and
applications regardless of pressure rating,
capacity and casing programmes. It utilises
pre-configured components and standard
rental tooling package.
Oceanus is specically designed for all explorationwells in water depth applications of around 80 to800 metres (2 625 feet).
The Oceanus fast-track wellhead is suitable for themost robust drilling programmes for both exploration,
appraisal and production turn-key developments.
Oceanus is supported by a dedicated manufacturingstocking programme, which means lead times and
project risks are reduced.
Key advantages
Short delivery time (8 weeks) as
part of the RapidSolutionTM
stocking programme
Dedicated manufacturing slots
Field-proven technology
Competitively priced
Supported with global rental tools
Oceanus
rapid
Nereus
deepsocket
Triton
RLD
Pontus
drill thru
Aegir
annulus B
18 18 18 13 18
Working Pressure rating, H2S trim 15,000 psi 15,000 psi 15,000 psi 15,000 psi 15,000 psi
Gasket profile VX/HX VX/HX VX/HX VX/HX VX/HX VX/HX
Temperature rating 250F / 35F 250F / 35F 250F / 35F 250F / 35F 250F / 35F
Bending capacity* 4MM ft-lbs 4MM ft-lbs 6.7MM ft-lbs 5.5MM ft-lbs 4MM ft-lbs
M to M sealing Yes Yes Yes Yes Yes
Mandrel H4-27size H4-27size H4-27"size H4-27size H4-27"size
Single hanger load 1MMlbs 1MMlbs 1MMlbs 1MMlbs 1MMlbs
Number of hanger slots 3-4 3-4 3-5 1 3
Conductor OD size 30 36" 36" 36 30
Conductor pressure rating 2000 psi 2000 psi 2000 psi 2000 psi 2000 psi
Conductor return flow-by 26in 30.6in 133.8in & shut-off 30.6in 26in
Pre-load wellhead to conductor none none 2,000,000lbs none none
Total load capacity 10.7 MMlbs 10.7 MMlbs 10.7 MMlbs 7.4MMLBS 7.4MMLBS
Oceanus was
the god of the
world-ocean
*Note: The bending capacity limited to the actual capacity of the blow-out prevention (BOP) connector
Wellhead comparison table
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Subsea wellhead systems
Nereus wellhead system
Nereus is a deep socket wellhead system.
It utilises a simple two point contact arrangement combined with a
C-ring at the lower end of the housing. This provide transfer of theexternal bending loads to the 36 conductor pipe. Rigid lock down forthe system is not required as the system has been field-proven for
deep water applications and fatigue analysis.
It transfers loads from the hangers and bending loads from the
blow-out preventor (BOP) and riser into the 36 conductor housing.This is achieved by a two point close clearance socketing arrangementbetween the 36 housing and the 18 wellhead housing.
Nereus is capable of installing the jetting base, 36 conductor housingand conductor pipe in a single trip.
Nereus was the old man of the sea, and the god of the seas rich
bounty of harvest
Triton wellhead system
Triton wellhead system is a rigid lock down (RLD) system.
The LD system is the most robust Wellhead system within the Akersolutions portfolio.
Wellhead is pre-loaded to connector with 2 000 000 lbs RLD.
The 36 conductor housing joint provides the structural foundation forthe wellhead system. It allows the wellhead to be pre-loaded to the
conductor housing using the RLD mechanism on the wellhead.
Triton is a mythological Greek god, the messenger of the deep
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Pontus wellhead system
Pontus is a drill through wellhead system.
It allows the top hole section to be drilled and the subsea tree landed,
locked and tested prior to the drilling out of the production 9 casing section.
Guideline-less and suitable for deep water application where water depth isbetween 914 to 2 286 metres (3 000 to 7 500 ft). The drill through 10 / 9 casing hanger with associated pack-offs are rated for 15 000 psi (1 030 bar)working pressure.
The drill through casing hanger can be run simultaneously with thepack-off by the single trip multi-purpose tool, or it can be run
independently by the casing hanger running tool.
The drill through casing hangers are locked in place by pack-off which is energised by weight and pressure load
The pack-off has a metal-to-metal seal for all permanently installedseals in the wellhead
Emergency seal assembly is available in case a seal cannot beestablished in the wellhead
Pontos (or Pontus) was the divinity of the sea, one of the rst born gods
Aegir wellhead system
Aegir wellhead system to monitor B-annulus.
This is achieved by the porting conguration through the 18 wellheadbody into the B-annulus section between the 13 and 9 casinghangers and pack off seals.
Flow is controlled through this porting by a 1 gate valve assemblywhich is housed integrally to the wellhead body. This valve wouldbe operated by an ROV.
The porting continues up through the wellhead body and back into thebore in a location above the 10 casing hanger pack-off seal
assembly, but below the wellhead gasket.
In production mode, with the tree installed this will allow
communication directly to the B-annulus section via the VX cavitywhen the 1 valve is opened.
Bleed down of the B-annulus section could also be carried out usingthis route.
Aegir is the king of the sea in Norse mythology
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Standard casing hangers
P13 / 9 casing hanger.
The casing hanger centralises and suspends a casing stringinside the 18 wellhead housing. It also provides a sealingsurface for the pack-off assembly to isolate the casing annulus.
Features:
15 000 psi system capacity
Hanging weight capacity of minimum rated load
capacity of 3 000 000 lbs
[13 300 kN] of which 1 000 000 lbs (4 400 kN)
due to casing load
Generous ow-by
Maximum particle size 0.750 (19.05mm)
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Optional casing hangers
13 / 9 piggyback hanger.
The piggyback hanger is used when the 13 pack-off is unable to sealdue to damage to the pack-off seal surface in the wellhead.
26, 24 and 16 sub-mud line hangers.
Used to provide additional casing string for shallow formations the
landing sub can be positioned at any position.
Casing hangers metal to metal sealing pack-off
The unique metal-to-metal pack-off has the followingdesign features:
Hydrostatic and gas testing
Forms integral part of load sharing mechanism
Gives positive lock-down for each hanger
Ensures accurate space-out for next hanger
Cannot be left in a partially set condition
All components of the pack-off can be serviced on site
Full metal-to-metal sealing
Has a lockdown capacity of 4 million lbs
Seal assembly is protected during running operations
HP/HT 15 000 psi, 250F / 35F (121C / 1C)
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Wellhead system tooling
A complete range of tools is availab le for all the Aker Solutions
wellhead systems, covering requirements for shipping, installation,
test and retrieval. These tools have been developed to providemaximum reliability while minimising the number of trips.
30 / 36 drill-ahead tool
Used to run the 36 and 30 conductor joint. The tool uses left handrotation to lock the tool in the conductor joint. Right hand turn on the
drill string will release the mandrel from the drill-ahead tool allowing the
drill string to continue with drilling operations for the 20 casing string.
The main feature is saving critical path rig time.
Single trip multi-purpose tool
Used to run, set and test the casing hangers with a pack-off in a single
trip. After the casing is cemented in place, the tool hydraulically sets the
pack-off. If the pack-off should fail to hold pressure, it can be retrieved bythe tool. There is a wash-out facility within the tool, all the sealing areascan be thoroughly washed prior to setting the seal assembly.
The main features are guaranteed sealing and saving critical path rig time.
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Facilities worldwide
We are present in allmajor oil and gas regions
around the world,ensuringtimely, efficient and
effective product and
service delivery.
Sales/engineering centre
Manufacturing and assembly
Service base
Additional products
18 wellhead drilling and
subsea tree connector
18 wellhead drilling and subsea
tree connector
The 18 H4 wellhead HPHT (high pressure/hightemperature) connector is eld proven with a highbending load capacity design, hydraulically
operated, metal to metal sealing VX/HX gasketprofile. It is extensively used to rigidly fasten the
BOP stack and the subsea production subseatree to the wellhead.
Features High load capacity
15 000 psi working pressure
3 000 psi / 5 000 psi function pressure
3.5 to 5.5 Mlbsf pre-load
11.5 Mlbsf leak tight capacity
Parallel connector
H4 prole
NORSOK compliant
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to be the preferred partner for solutions in
the energy and process industries...
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Our vision
to be the preferred partner for
solutions in the energy and process
industries...
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Contact Aker Solutions:
2008 Aker Solutions
North America
3600 Briarpark drive, HoustonTexas 77042USA
Tel: +1 713 685 5700Fax: +1 713 685 5707
South America
Rua da Ajuda, 35-21 andar, CentroRio de Janeiro - RJ CEP 20.040-915BrazilTel: +55 (21) 2122 44 01Fax: +55 (41) 2122 44 02
Headquarters
Snaryveien 36, 1364 FornebuP.O. Box 94, 1325 LysakerNorway
Tel: +47 67 82 60 00Fax: +47 67 82 64 00
United Kingdom
Howe Moss Ave.Kirkhill Industrial Estate, Dyce
Aberdeen AB21 0NAUKTel: +44 (0)1224 255 000Fax: +44 (0)1224 255 100
Africa
SONILS OSCRua 6 - I.L., Boavista, Luanda
Angola
Tel: +47 51 88 87 00Fax: +47 67 82 64 00
Asia Pacific
Level 20, Menara HLA No. 3Jalan Kia Peng 50450 Kuala LumparMalaysiaTel: +6 (0) 3 2381 8388Fax: +6 (0) 3 2381 3560
Australia
4-6 Anderson PlacePerth Airport,Western Australia 6105Tel: +61 (0)8 9262 9300