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Sea Nova MFP

SEA NOVA MINIMUM FACILITIES PLATFORMS

Ocean’s Sea Nova Minimum Facilities Platform (MFP) Systems are a patented and evolved concept for the provision of shallow water offshore platforms. It has a fully developed safety case and has the lowest through-life costs of any comparable platform. In a recent Technology Readiness Level Assessment conducted by Petronas Caragali Sdn. Bdh. Sea Nova scored TRL 7 out of 7 to API 17N.


Sea Nova offers infrastructure production costs around US$ 5 per bbl giving real profits even at current oil prices.


Sea Nova is a production vehicle, not an expensive production monument!

SEA NOVA

Infrastructure Production Cost – around US$ 5 per barrel! *

Sea Nova is flexible and effective over the full range of water depths in which a typical drilling jack-up might operate.

It typically incorporates a cellular concrete gravity base providing an integral and rigid foundation for four tubular steel un-braced column legs.

The columns in turn support a conventional trussed rectangular topside structure, which supports process equipment, wellheads, control room, helideck, accommodation etc.

The base, columns and topside form an extremely rigid portal frame arrangement eliminating the need for a complex bracing arrangement.

Specifically Sea Nova has the following attributes essential in the current (and future) commercial climate:

  • Self-Installing and Easily Relocatable 
  • Spacious Flat Equipment Layout (with low bulk pipework and cabling)
  • Low Maintenance Costs (20% of conventional platform)
  • Accommodates poor seabed conditions (low seabed loading)
  • Generally no seabed preparation
  • Accommodates high topside loading
  • Maximum Water Depth - 120 metres
  • Maximum Number of Drilling Slots - 12
  • Maximum Topside Weight typically 6000 Te
  • On-Board Drilling is Feasible
  • Accommodates pre or post drilled wells
  • Can incorporate Oil/Fluid Storage up to 300,000 bbls

For very poor seabed conditions, Sea Nova's foundation system and installation procedure can be adapted to use conventional piles or suction piles depending upon ground conditions.  Our geotechnics team can help you assess what foundation will work best on your seabed based on your soils data.


You can view two applications of Sea Nova in the video's here.  The first one shows a self- installed Sea Nova with a jack-up drill rig completing drilling through the platform. It will be noted that storage can be provided with any Sea Nova option. The second shows Sea Nova being used for on-platform drilling with support provided by a second Sea Nova, subsequently re-deployed.  On-platform drilling support might equally be provided by a support vessel.



Sea Novas under construction, installation and operation

SELF INSTALLING

Ocean’s Sea Nova Platform System is a self-installing jack-up structure. It differs from conventional drilling jack-ups in that moment support is provided at both the upper and lower ends of the un-braced column legs, hence the legs are subject to lower stresses. Furthermore, the jacking system is attached during installation only. There are no high fatigue areas such as exist in a conventional jack-up and the locking system is both simple and low-stressed.

Sea Nova can be fully commissioned onshore with only minimal tie-in and pressure testing on location. 


LOW COST MAINTENANCE

As the Sea Nova structure is a simple un-braced 4-legged structure, it has no complicated K-joints or nodes to inspect. The exposed area of steel in the splash zone or beneath Mean Sea Level (MSL) is less than for a similar performance conventional platform hence corrosion and marine growth are less problematic. The column legs are dry to the seabed and thickness checks can be conducted from the inside by platform personnel (i.e. no diving or ROV inspection required). Cleaning marine growth is a relatively easy operation and because of this and the simpler inspection regime, maintenance costs are considerably reduced.

Note the platform stiffness is comparable with a conventional braced structure.

RE-USABLE

A significant advantage of the design is Sea Nova’s ability to be easily removed and re-used. This obviates high decommissioning provision and is particularly attractive to the sequential development of multiple fields or areas.

The design fully conforms with all relevant codes and standards normally applicable to offshore structures worldwide and Sea Nova  will withstand the severe wave regime existing in the North Sea and can, therefore, be located anywhere.

The design features discussed below give Sea Nova the lowest infrastructure cost per barrel  of any structure (fixed or floating) of comparable performance!

FLEXIBLE OPEN LAYOUT

Ocean’s Sea Nova Platform System is flexible providing a large deck area.

As the Sea Nova Platform design is driven by lateral (environmental) loading, it can carry a very significant payload without increase in the steel member sizes or weight. The topside structure comprises a flat-trussed structure with two or more large pancake decks facilitating maintenance-friendly equipment layouts.

The Sea Nova topside structure is supported by four tubular columns extending from one of the foundation options specified above.

It can accommodate:

          ■  dry trees, 
          ■  process equipment,
          ■  power generation,
          ■  control systems,
          ■  helideck,
          ■  accommodation
          ■  all associated facilities.


INTEGRATED HELIDECK

Sea Nova typically incorporates an integrated helideck that can accommodate a large service (S76 or equivalent) helicopter. The design allows helicopter operations to continue during all offshore activities including wireline, coil tubing and workover operations during which a lubricator mast can be erected at any well position.

The helideck can be integral or separate and  Sea Nova will support a crane, cantilevered vent or flare or other associated facilities.

A boat landing option is also available and this can be retractable with remote controlled lowering and raising.  This was used on our MOD platforms so is a proven alternative.

OPTIMISED FOUNDATION

In its normal (and most economical) configuration Sea Nova is fitted with a concrete gravity base structure (GBS). The GBS typically comprises a rectangular hollow reinforced concrete structure of proven design. It is self-floating and when deballasted its inherent buoyancy is used to aid towage and installation. No specialised vessels or heavy-lift facilities are required during installation hence reducing costs whilst increasing project flexibility.

The base can be fitted with detachable footpads that are tailored to meet a specific site’s characteristics in relation to level, need for skirts etc. The use of these footpads simplifies later removal of the platform at the end of its field life. New footpads can subsequently be fitted to suit a later deployment at a new field with different seabed conditions.

The steel tubular legs are cast into the GBS enclosed inside a circular reinforced concrete sleeve that spans between the upper and lower horizontal slabs of the base itself. In addition to this a large steel collar located above the upper reinforced concrete slab is used to transfer applied loads into the gravity base at relatively low stress levels. A system of ballast pipework is fitted to allow differential ballasting or de-ballasting of the base structure.

Real Experience,Real Expertise,Proven Technology

We've been there, We've done It!

SEA NOVA with
ASSOCIATED STORAGE

InfraStructure Production Cost – below US$ 5 per barrel!  *

Marginal Oil or Gas Fields need to be developed at the lowest possible cost/barrel consistent with a safe and sustainable operation. Oil and Gas will remain part of our energy future for most if not all of this century but its profitability, certainly in the short term, will be subject to an uncertain selling price and will require the most cost-efficient production system in both Capex and Opex terms.

Sea Nova with Associated Storage will achieve a typical infrastructure production cost of less than around US$ 5 per barrel for fields with:

  • Water depths up to 120 metres
  • Production Rates of 30,000 bbls/day of produced oil **
  • Topside Equipment Loads typically 500 to 5,000 tonnes or higher
  • Shuttle Tanker Off-take from 200,000 to 300,000 bbls storage 

Sea Nova with Associated Storage competes directly with an FPSO solution at a fraction of its through-life costs. Even basic FPSO solutions have an operating cost in the region of US$ 13 per barrel and may be more expensive due to complex subsea maintenance operations.

Notes:

* Drilling Costs excluded.

** Larger or smaller production rates can be accommodated. 30,000 bbls/day is used to calculate typical pricing.



Sea Nova with Associated Storage

What is Sea Nova with Associated Storage?

The system comprises a subsea pre-stressed, self-installing and re-locatable reinforced concrete Storage Tank positioned directly over the well positions with a Minimum Facilities Platform, Sea Nova, located on top.

The wells may be pre-drilled or post-drilled either by jack-up or by on-platform drilling. In the former case the system can mate with a pre-drilled template.

The Storage Tank comprises a conventionally-shaped structure approximately 48 metres in diameter and 28 metres high. It is installed in advance of the platform unit. It is designed to ensure low seabed loading and provides an “artificial seabed” which can accept the installation of the  Sea Nova platform unit on top.

In most cases no seabed preparation is required. In shallow water the storage unit can be deployed alongside the well position and platform deployment location.

SYSTEM DESCRIPTION


The system is based entirely on well proven and fully verified components. Specifically:

  1. Sea Nova MFP Platform Component. This is a well-proven platform having been deployed in both the UK and Dutch sectors (Southern North Sea and Irish Sea) for both oil industry and defence applications. It has been fully certified for water depths up to 46 metres and wave heights of 15 metres. It has been studied (and verified) by BP, Kvaerner, Petronas, etc. in various studies to water depths of 120 metres and for on-platform drilling with derrick loads of 1000 Te.

    Sea Nova has a combined operational experience of around 50 operational years and can be fitted with a gravity base or suction piles. It has been both post-drilled by jack-up and has been set down on suspended wells. The post-drilling operation used drilling sleeves as offered herein.

  2. The Associated Storage is based both upon Ocean's experience and expertise in the design, installation and operation of various Condeep concrete offshore platforms where integral oil storage is provided in similar concrete storage tanks operating on precisely similar principles and on Ocean's experience and expertise in the design, construction and installation of cellular concrete structures up to 25,000 tonnes in water depths up to 150 metres. Ocean has also designed subsea fluid storage systems for chemicals storage up to 1000 Te. Again all these systems have been variously certified/verified for oil industry applications.

The advantages of a concrete storage tank as compare with steel include:

  • It is relatively low cost
  • It has greater heat insulation to preserve stored oil temperature
  • It is robust and not susceptible to accidental damage
  • It is not subject to corrosion

OPERATING MODE

Produced fluid is imported via dry trees located on the platform lower deck.   Production conductors run from the drilling slots to pre-installed sleeves in both the platform gravity base and the subsea storage unit.

The produced fluid is processed for export by conventional production equipment located as required on the platform topside. Once stabilised for tanker export it is transferred by the production riser to the subsea storage tank where it displaces seawater ballast to a settling cell within the structure. The settling cell has a long residence time and oily water settles at the top of the cell from where it is drawn off and returned to the platform for further clean-up prior to discharge. Ballast water could be expected to be discharged with contamination levels less than 20 ppm. 

The stored produced fluid displaces the ballast water until the cell is fully loaded. At this point it must either be exported by shuttle tanker or production must halt. If the stored fluid is heavy (viscous) it can be heated to maintain temperature with a heating medium being pumped and re-circulated through the storage volume from the platform. Export to shuttle tanker can be achieved through a conventional CALM Buoy or, in certain circumstances, via a reel system on the platform itself. 

Why is the System Cheaper than an FPSO?

The FPSO Tanker is eliminated thus removing the most expensive system component in terms of both Capex and Opex costs. No mooring, no manning, no excessive HSE costs, no fuel costs, no expensive maintenance! Relocation costs are similar for both systems though platform and storage reinstatement will be considerably lower than for the FPSO.

Next Steps:

Contact us to see how Sea Nova with Associated Storage can provide you with a robust and cost-effective development plan using Ocean's proven technology!

HEAD OFFICE
Castlegate Business Park
Portskewett
Monmouthshire
NP26 5AD
Wales

SOUTH EAST ASIA OFFICE
15th Floor, West Block 
Wisma Selangor Dredging
142C, Jalan Ampang 
50450 Kuala Lumpur
Malaysia

LINKS


CONTACT DETAILS

Email: info@oceanresource.co.uk

Head Office Phone: +44 (0) 1291 408088

Malaysia Office Phone: +60 13 439 3114

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