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Wellhead Platform Fabrication & Maintenance

Pipelines, facilities & platforms. EPC projects on flowlines and pipelines, the facilities they feed, and the wellhead platforms at the end of them: built, maintained and kept in service.

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The service

Wellhead platforms, fabricated, installed and kept in service.

This is the work around the wells and flow stations: wellhead platforms fabricated and set over the creek, platform decks and drain platforms, piled foundations, manifolds, skids, and the piping that connects them to production. Winsko also maintains platforms already in service: repairs, refurbishment, replacement and hook-up.

Most of it is fabricated in Winsko's own workshop under a 50-ton overhead crane, then loaded onto its own barges at the Trans-Woji jetty and carried to swamp and creek locations, where crane barges and swamp buggies set it in place.

On a live field the installation is only half the job. Tie-ins, modifications and hook-ups are planned with the operator around production, so that new equipment goes in without an unplanned shutdown.

Worker on the steel frame of a wellhead platform being installed over the creek, its reflection in the water
Wellhead platform installationPhotograph

Where it sits in the project lifecycle

  1. 01Engineering / Design
  2. 02Procurement & Logistics
  3. 03Fabrication
  4. 04Construction / Roads / Erection / Installation
  5. 05Testing / Pre-Commissioning
  6. 06Commissioning
  7. 07Operation, Maintenance & Handover

By the numbers

50 t
Workshop overhead crane
Fabrication under cover, at the Trans-Woji base
80 t
Track crane
Crawler crane for lifting platforms and skids
1,200 t
Largest barge
Dump barge; the fleet also has two lay barges of 600 t and 500 t
2014
First platform installation on record
Installation and demob of a platform at Diebu Creek flow station

Scope of work · 06 work packages

What the work covers.

  • 01

    Wellhead platforms

    Fabrication, installation and hook-up of wellhead platforms in swamp and creek locations.

  • 02

    Platform decks

    Deck works, drain platforms, utility house platforms, walkways and helipad structures.

  • 03

    Piling and foundations

    Piled foundations for platforms and flow station equipment.

  • 04

    Manifolds and skids

    Production and gas-lift manifolds, metering skids and their associated piping.

  • 05

    Facility modifications

    Piping changes, strainers and new connections on operating flow stations.

  • 06

    Platform maintenance

    Repairs, refurbishment and replacement of wellhead platforms and their hook-up arms, with scaffolding and safety mesh.

Method · 06 stages

From the workshop floor to the wellhead.

How a platform or skid is built and set, with the checks that close each stage.

  1. 01

    Fabrication

    Steelwork and piping are cut, fitted and welded in the workshop to the approved drawings and welding procedures, then blasted and painted under cover.

    • Dimensions checked against the drawing
    • Welds inspected and logged
    • Coating thickness checked
    Fabrication workshop with a yellow overhead crane spanning the bay
    Fabrication workshopPhotograph
  2. 02

    Load-out

    Finished structures are lifted onto Winsko's barges at the jetty, sea-fastened and towed to site.

    • Lift plan for every heavy lift
    • Sea-fastening checked before sail-away
    • Marine crew briefed
    Two cranes lifting steel onto a barge at the jetty
    Load-out at the jettyPhotograph
  3. 03

    Piling and foundations

    Piles are driven to the design depth or refusal and cut to level, giving the platform or skid a firm, level base in soft swamp ground.

    • Pile positions set out
    • Driving record for every pile
    • Cut-off levels checked
    Two welders in orange coveralls working on the steel jacket under a platform deck, just above the water
    Welding on a platform jacketPhotograph
  4. 04

    Setting and levelling

    The crane barge sets the jacket, deck or skid on its foundation; it is levelled, aligned and welded or bolted down.

    • Level and orientation checked
    • Connections completed and inspected
    • Temporary works removed
    Worker on the steel frame of a wellhead platform being installed over the creek
    Platform installationPhotograph
  5. 05

    Tie-in and hook-up

    Piping is connected to the wellhead, manifold or flow station at the agreed points under the operator's permit to work.

    • Isolation agreed with the operator
    • Closing welds fully inspected
    • Bolted joints torqued and tagged
    Crew member at the wellhead on the new platform
    Wellhead hook-upPhotograph
  6. 06

    Testing and hand-over

    New piping is flushed and pressure-tested, the installation is checked against the punch list, and the as-built records go to the operator.

    • Pressure test witnessed
    • Punch list closed out
    • As-built drawings handed over
    Crew in red coveralls and life jackets on a black and yellow wellhead platform over a wide river
    Crew on a wellhead platformPhotograph

Plant and equipment

Lift it, carry it, set it, with our own plant.

Heavy lifts over water need cranes, barges and tugs on the same plan. These come from Winsko's own register.

Workshop overhead crane
50 t
Track crane
80 t, crawler
Tyre cranes
3 × 22 t and 1 × 50 t
Self-loader truck
10 t, HIAB
Barges
Lay, ramp and dump, 400 t to 1,200 t
Hydraulic shop press
75 t
Low beds
35 t and 40 t
Blasting and painting
Atlas Copco, Basfer, Graco
Crawler cranes and swamp buggies on the yard
Crawler cranesPhotograph
Fabrication workshop bay with overhead crane and welding generators
WorkshopPhotograph
Coated line pipe on the barge deck
Barge deckPhotograph

From the record

Wellhead platform, Cawthorne Channel 1

A new wellhead platform installed over the creek at Well 16, with hook-up of the replaced 1.6 km flowline. The platform and pipe went out from the Trans-Woji jetty by barge.

Scope
Wellhead platform installation and hook-up
Line
4-inch Schedule 40 flowline, 1.6 km
Setting
Creek location, Cawthorne Channel, Rivers State
Spread
Crane barge, swamp buggy, tug boats, house boat
Worker on the steel frame of the wellhead platform during installationPhotograph
Platform installation
Cranes loading steel onto a barge at the jettyPhotograph
Load-out
Crew at the wellhead on the finished platformPhotograph
Crew at the wellhead
Crew member at the wellhead on the new platformPhotograph
Hook-up

Track record

Platforms, manifolds and modifications on record.

A selection from the list of jobs in the company profile.

  1. 2024Wellhead platform installation and hook-up, Well 16Cawthorne Channel 1
  2. 2022Piping modifications at the flow station for crude barging to a process bargeAlakiri flow station
  3. 2019Wellhead platform construction and installation, PMMO-1Akaso
  4. 2019Platform repairs, Well 7LSAlakiri
  5. 2018Wellhead platform refurbishment and hook-up, Well 24Cawthorne Channel
  6. 2017–18Manifold platform modification and bulk production manifoldOrubiri
  7. 2017Utility house platform with structural and piping rehabilitationKrakama flow station
  8. 2016Wellhead platform replacement, Well 11TAlakiri
  9. 2014FLKO and PDV drain platform deck works, platform installation and piling foundationsDiebu Creek flow station

Inspection and testing

Built to the drawing, proven on site.

Each structure carries its records from the workshop to the field: material certificates, weld and coating inspections, piling logs and the final test.

01Material certificatesSteel, pipe and fittings match the specificationWhenOn receiptRecordMill certificates, heat numbers
02Dimensional checkThe structure matches the drawing before it leaves the yardWhenAfter fabricationRecordDimensional report
03Weld inspectionNo rejectable defects in structural and piping weldsWhenDuring fabricationRecordWeld map, NDT reports
04Coating inspectionSurface preparation and paint thickness meet the specificationWhenBefore load-outRecordCoating report
05Piling recordEach pile reached its design depth or refusalWhenDuring pilingRecordDriving logs
06Pressure testNew piping holds its test pressureWhenBefore hand-overRecordTest certificate

Codes commonly specified for this work

  • API RP 2AFixed platforms
  • AWS D1.1Structural welding
  • ASME B31.3Process piping
  • ASME IXWelding qualifications
  • ISO 12944Protective paint systems
  • API 6AWellhead equipment

Health, safety and environment

Heavy lifts, over water, next to live wells.

Installation stacks the hazards: big lifts from barges, work over water, piling noise and vibration, and tie-ins on producing fields.

  • 01

    Heavy lifts

    An engineered lift plan for each heavy lift, certified rigging, one banksman, and nobody under the load.

  • 02

    Work over water

    Life jackets, edge protection on decks and a rescue boat on standby.

  • 03

    Piling

    Exclusion zone around the hammer, hearing protection and checks of the pile and leader alignment.

  • 04

    Live wells

    Simultaneous operations planned with the operator, permit to work and continuous gas monitoring.

  • 05

    Hot work

    Hot work permits, fire watch and extinguishers; no hot work near live equipment without gas clearance.

  • 06

    Towing and mooring

    Tow plan, weather check before sail-away, and mooring lines kept clear of the crew.

Our HSE approach

FAQ · 05 questions

Questions, answered.

Short answers about wellhead platform fabrication & maintenance at Winsko, from the company profile.

01

What wellhead platform work does Winsko do?

Fabrication, installation, hook-up, repair, refurbishment and replacement of wellhead platforms in swamp and creek locations, together with platform decks, drain and utility house platforms, piled foundations, manifolds and skids.

02

Where are the platforms fabricated?

Most of the steelwork is fabricated in Winsko's own covered workshop in Port Harcourt, under a 50-ton overhead crane, then loaded onto its own barges at the Trans-Woji jetty and set in place on site by crane barge and swamp buggy.

03

Does Winsko maintain platforms that are already in service?

Yes. Winsko has repaired platforms at Alakiri, refurbished and hooked up a wellhead platform at Cawthorne Channel (Well 24, 2018) and replaced a wellhead platform at Alakiri (2016).

04

Can installation be done on a producing field?

Yes. Tie-ins, modifications and hook-ups are planned with the operator around production, so new equipment goes in without an unplanned shutdown.

05

What lifting capacity does Winsko have?

An 80-ton track crane, tyre cranes from 22 to 50 tons and a 50-ton overhead crane in the workshop, with lay barges of 600 and 500 tons and barges up to 1,200 tons to carry the loads.

Also in the scope

07Start a project

Winsko Serves Limited

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Operational base / jettyElshcon Close, Trans-Woji (Slaughter), Port Harcourt, Rivers State

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