WHAT - Subsea All Electric Systems

8/10/2019 WHAT - Subsea All Electric Systems

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stallation of an eSCM

FMC’s electric subsea technology utilisesexisting low-power umbilical and connectortechnology, which provides a safer operatingenvironment and prevents corrosion fromstray high-voltage currents.

This technology reduces costs for topsidepower generation, transformer equipment

and umbilicals, and components are adaptableto upgrade existing systems.

The technology uses standard subsea cablesand connectors along with rechargeablesubsea batteries to power valve and actuatoroperations, so no high-power/ high-voltage cabfrom the surface is needed.

Li-Ion Technology

Li-ion batteries are largely produced for high-tech professional and consumer applicationsand are easily integrated due to their smallsize. Their proven reliability ensures a lowrate of failure in service, no sudden death, orperformance deviations. Li-ion batteries provideexceptionally long life cycles and maintenance-free technology allowing for low life-cycle cost.

FMC have developed a Battery ManagementSystem (BMS) dedicated to the application.Features in this system allow users to manage:power flow in the systems; charging strategies;monitoring of voltage, current and temperaturecell balancing and redundancy switching with aCAN interface.

Electric Subsea Technology

tilisation of Electric Subsea Technology will grow in the future due tohe inherent environmental and functional advantages – zero dischargend significant system simplifications result from elimination ofydraulics.

Without the use of hydraulic fluids, electric

subsea developments are environmentallysafe. FMC Technologies leads the industry insubsea all-electric technology, with field provensubsea experience operating multiple chokeson installed production wells since 2001.

Electric technology is well suited for a largenumber of subsea applications:

Long distance tiebacks

Water injection wells

Chokes

Manifold valves

Valve actuator retrofits

Process control valves for subsea separation

Anti-surge valves for subsea gas

compression

FMC Technologies’ Low-Voltage Approach

Separate eSCMs for full redundancy

Electric Subsea ControlModule (eSCM)

The electric Subsea Control Module(eSCM) governs the electric control system.It comprises traditional SEM technologyas in ordinary SCMs for communication,power conditioning and data acquisition.It also houses the Li-Ion Battery Packs andthe Battery Management System (BMS).



www.fmctechnologies.com/su

ectric XT valves

he XT valve actuators utilize the same core technolgy as theanifold and choke actuators, and fail safe battery operatedtuators are alredy in operation subsea. Redundancy and 3rd partyrtification according to IEC 61508 Safety Integrity Levels (SIL) isplied to ensure safe operation. Mechanical fail safe actuators are

so available.Electrical ActuatorLi-Ion cells battery

Base case fail safe option



Failsafe Electric Actuator Standard electric actuator

Reference Projects

Further development ofelectric subsea technology

FMC’s demonstrated and qualifiedtechnology offers a solid platform for furtherdevelopment and is suitable for a range ofother applications, including:

Ultra-long distance tiebacks

Water injection wells

Manifold valves

Retrofit hydraulic actuators

Retrofit manual valves and chokes to add

remote actuation

Process control valves for subsea

separation

Anti-surge valves for subsea gas

compression

lectric manifold valves

tuator systems also can be used to operateanifold and pipeline sled valves. Electricanifold valve control is especially attractivesystems where control modules can beminated from the manifold. The technologyfers precise position control and can beplied subsea without a hydraulic umbilical,oviding huge cost-saving potential.

sing the system on local energy storage withchargeable batteries enables cost-efficienttrofit scenarios like those of Statoil’s Norne

system in the North Sea. In the Nornesystem, electrical operation replacesmanually and hydraulically operated valvesand chokes.

This modification results in betterresponse times for the chokes, enables freerouting of existing and new infield wellsand liberates hydraulic lines in an existingumbilical. Capital expenditures for the fieldextension are reduced significantly.

oke actuator

lectric Choke Actuator

electric choke actuator system, consistingelectric choke controls and a sand detection

stem, was retrofitted to Statoil’s Statfjordoject in 2001. Due to the success of thisstem, the technology for electrical actuatorswered by rechargeable batteries has beenoven in the field

e system was developed for easy integrationto existing subsea control systemchitectures, with no impact on communication

quality and a minor increase in powerconsumption. To avoid loss of production,the new system was designed so it couldbe installed without having to retrievethe SCMs (Subsea Control Modules) orchoke bridges. All subsea equipment wasdesigned for installation with ROV support.The choke actuators are easy to adapt toany ROV interface.

FMC Technologies’ subsea electrictechnology powered by rechargeablebatteries has been proven in the field.FMC will continue to work with itscustomers to meet their needs and willgo on conducting field installations toensure that FMC’s products and systemsare dependable, reliable and safe.

Statfjord Satellites StatoilHydro 2001

Norne Retrofit StatoilHydro 2006

Åsgaard StatoilHydro 2006

RLWI Mk2 StatoilHydro 2008

RLWI Mk2 BP 2008

Albacora Petrobras 2008

Gjøa StatoilHydro 2008

Pluto Woodside 2008

Choke Control

PROJECT OPERATOR YEAR

Manifold and choke control

Intervention

Water injection control

Pig valve control



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h n ol o gi e s | 3 D i l l u s t r a t i on s b yI n d u s t r i el l D ok um en t a s j on

FMC Technologies1777 Gears RoadHouston TX 77067

USAPhone: +1 281 591 4000www.fmctechnologies.com/subsea

FMC TechnologiesP.O. Box 1012NO-3601 Kongsberg

NorwayPhone: +47 3228 6700

WHAT - Subsea All Electric Systems

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