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Subsea wellhead systems

Subsea wellhead systems The next generation in Aker Solutions’ wellhead family Wellhead brochure_dp.indd 1

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Subsea wellhead systems

Illustration of a subsea wellhead

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Subsea wellhead systems

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 • Pack-offs • Tooling • Drilling connectors

Products and services Wellhead brochure_dp.indd 3

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Subsea wellhead systems

Subsea wellheads

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 profile wellhead complete with a VX/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 housing not through single lower shoulder • Each pack-off can transfer 5.0 M.lbs load directly into the housing • Total load capacity 10.7 M.lbs, the highest load capacity in the industry

Key accreditations Aker Solutions holds certificates of accreditation for the use of American Petroleum Institute 6A, 16A and 17D, ISO 9001:2000 and ISO 14001:2004.

• Preferred load path method greatly reduces stack-up tolerances • System gives positive hanger lock down, essential for 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

Advanced wellhead technology Aker Solutions is a world leader in the design and manufacture of subsea wellhead systems

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Subsea wellhead systems

‘Oceanus was the god of the world-ocean’ 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 wellhead system (ultra rapid system)

Oceanus is specifically designed for all exploration wells in water depth applications of around 80 to 800 metres (2 625 feet). The Oceanus fast-track wellhead is suitable for the most robust drilling programmes for both exploration, appraisal and production turn-key developments. Oceanus is supported by a dedicated manufacturing stocking 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

18¾”

18¾”

18¾”

135 8 ”

18¾”

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

H4-27”size

H4-27”size

H4-27"size

H4-27”size

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

26in²

30.6in²

133.8in² & shut-off

30.6in²

26in²

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

Wellhead comparison table

*Note: The bending capacity limited to the actual capacity of the blow-out prevention (BOP) connector

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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 the external bending loads to the 36” conductor pipe. Rigid lock down for the 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 arrangement between the 36” housing and the 18¾” wellhead housing. Nereus is capable of installing the jetting base, 36” conductor housing and conductor pipe in a single trip.

‘Nereus was the old man of the sea, and the god of the sea’s rich bounty of harvest’

Triton wellhead system Triton wellhead system is a rigid lock down (RLD) system. The RLD system is the most robust wellhead system within the Aker Solutions portfolio. Wellhead is pre-loaded to connector with 2 000 000 lbs RLD. The 36” conductor housing joint provides the structural foundation for the 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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Subsea wellhead systems

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 95 8 ” casing section. Guideline-less and suitable for deep water application where water depth is between 914 to 2 286 metres (3 000 to 7 500 ft). The drill through 10¾” / 9 8” 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 the pack-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 installed seals in the wellhead • Emergency seal assembly is available in case a seal cannot be established in the wellhead

‘Pontos (or Pontus) was the divinity of the sea, one of the first born gods’

Aegir wellhead system Aegir wellhead system to monitor B-annulus. This is achieved by the porting configuration through the 18¾” wellhead body into the B-annulus section between the 13 8” and 9 5 8” casing hangers and pack off seals. Flow is controlled through this porting by a 1” gate valve assembly which is housed integrally to the wellhead body. This valve would be operated by an ROV. The porting continues up through the wellhead body and back into the bore in a location above the 10¾” 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 cavity when the 1” valve is opened. Bleed down of the B-annulus section could also be carried out using this route.

‘Aegir is the king of the sea in Norse mythology’

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Subsea wellhead systems

Standard casing hangers P13 8” / 9 5 8” casing hanger. The casing hanger centralises and suspends a casing string inside the 18¾” wellhead housing. It also provides a sealing surface 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 flow-by • Maximum particle size 0.750” (19.05mm)

Optional casing hangers 13 8” / 9 5 8” piggyback hanger. The piggyback hanger is used when the 13 2” pack-off is unable to seal due 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 following design 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, 250ºF / 35ºF (121ºC / 1ºC)

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Subsea wellhead systems

Wellhead system tooling A complete range of tools is available for all the Aker Solutions’ wellhead systems, covering requirements for shipping, installation, test and retrieval. These tools have been developed to provide maximum 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 hand rotation 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 by the tool. There is a wash-out facility within the tool, all the sealing areas can 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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Subsea wellhead systems

Additional products

18¾” wellhead drilling and subsea tree connector The 18¾” H4 wellhead HPHT (high pressure/high temperature) connector is field proven with a high bending load capacity design, hydraulically operated, metal to metal sealing VX/HX gasket profile. It is extensively used to rigidly fasten the BOP stack and the subsea production subsea tree 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 profile • NORSOK compliant

18¾” wellhead drilling and subsea tree connector

Facilities worldwide We are present in all major oil and gas regions around the world,ensuring timely, efficient and effective product and service delivery. Sales/engineering centre Manufacturing and assembly Service base

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Subsea wellhead systems

‘to be the preferred partner for solutions in the energy and process industries...’ Our vision

‘to be the preferred partner for solutions in the energy and process industries...’

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Subsea wellhead systems

Contact Aker Solutions: Headquarters Snarøyveien 36, 1364 Fornebu P.O. Box 94, 1325 Lysaker Norway Tel: +47 67 82 60 00 Fax: +47 67 82 64 00

North America 3600 Briarpark drive, Houston Texas 77042 USA Tel: +1 713 685 5700 Fax: +1 713 685 5707

Asia Pacific Level 20, Menara HLA No. 3 Jalan Kia Peng 50450 Kuala Lumpar Malaysia Tel: +6 (0) 3 2381 8388 Fax: +6 (0) 3 2381 3560

United Kingdom Howe Moss Ave. Kirkhill Industrial Estate, Dyce Aberdeen AB21 0NA UK Tel: +44 (0)1224 255 000 Fax: +44 (0)1224 255 100

South America Rua da Ajuda, 35-21° andar, Centro Rio de Janeiro - RJ CEP 20.040-915 Brazil Tel: +55 (21) 2122 44 01 Fax: +55 (41) 2122 44 02

Australia 4-6 Anderson Place Perth Airport, Western Australia 6105 Tel: +61 (0)8 9262 9300

© 2008 Aker Solutions All rights reserved. Photo by Pål Laukli www.akersolutions.com/subsea

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Africa SONILS OSC Rua 6 - I.L., Boavista, Luanda Angola Tel: +47 51 88 87 00 Fax: +47 67 82 64 00

September 2008

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