OTC 2010 X-pert Center - Siemens Energy Sector · PDF fileKey trends & drivers for Subsea Power Longer step-outs Marginal and dispersed fields Deeper waters Heavier oil. O&G reserves

Copyright © Siemens AG 2010. All rights reserved

OTC 2010 X-pert Center

Subsea Power Grid

Bjørn Einar Brath



Major innovationsMajor R&D investments

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CT with fastest imaging and lowest radiation dosage

Efficient power transport (HVDC): the new 800-kV high-voltage, direct- current transmission system minimizes power losses

Arvedi endless strip steel production: new plant delivers energy savings of 45 percent and steel of superior quality

€3.9 billion in fiscal 2009, or 5.1% of revenue

31,800 R&D employees worldwide 17,000 software engineers 176 R&D locations in over

30 countries around the world 7,700 inventions in FY2009 More than 56,000 active patents

Innovation is our lifeblood


Subsea: Increasing need for power as reserves become more difficult to extract

Key trends & drivers for Subsea Power Longer step-outs

Marginal and dispersed fields

Deeper waters

Heavier oil

O&G reserves increasingly difficult to extract

Boosting & ESP

Water injection

Compression

Separation

Processing equipment moving from topside to subsea

Source: Quest, Infield

# of subsea wells 1980 – 2015

MV power cables integrated into umbilical

Transformers Switchgear Converters & VSDs Connectors & Penetrators Control systems

Power grid needed

Power at Sea HVDC

Game changers from Siemens


Offshore Global Organization

BC USA, Houston

BC Brazil

BC China

BC Singapore

BC Netherlands

RussiaCanada

Middle EastMexico India

AustraliaSouth Africa

Business CentersE O CS Headquarters Engineering CentersRegional Company

HQ Norway

Subsea Center of Competences


Risers

Manifold

Subsea TreesControls

Flowlines

Umbilicals

Transformer& Switchgears Step down power to suitable

voltage Distribute

power within field

VSD To control/run subsea

engines, e.g. pumps, compressors, water injection

Power Cables / Umbilicals Supply necessary control,

chemicals and power to subsea equipment

Pumps & ESPs Artificial lift / Multiphase Boosting, tie-back & gas

injection Water injection

Compressor Wet-gas

compression

Control systems Subsea power management Subsea

processing

Siemens target offering: Power distribution and consumers

Siemens subsea power distribution and power management – for boosting applications



Subsea Power Grid Subsea Control & Condition monitoring Subsea Compression HVDC for long step outs

Enabling subsea processing further



Subsea step down transformer General arrangement

Total Length - Width – Height (Included compensators and LV connectors) mm: 4500 x 2400 x 2840 Total weight 23 000 kg , fluid 9 600 kg Weight submerged: 10 100 kg


Subsea step down transformer Design data

Water Depth 3050 m (10,000 ft )Design Primary Voltage (ph-ph) 22 kV Design Secondary Voltage (ph-ph) 6.6 kV Design Life 30 Years Operational Frequency Range 33 to 66 Hz Winding Configuration Delta – High Resistance Ground Seawater Temperature 4 °C Design Temperature Range -5 °C to 40 °C (Storage and transport) Cooling Type Natural Circulation Source Power Type Topside VFD Input Load Type Pump Motor Max Power at Motor Shaft 3000 kW Total Harmonic Distortion < 5%Housing Double shell design


Subsea step down transformer Transformer components


36 kV Subsea switchgear Design data

Switchgear

30 mile

10 0

00 ft

36 kV

10 MVA

Possible configuration for more than 4 users

Switchgear with Additional Connectors

(Option)

2 end. Switchgear module

MV Jumper

The total load is limited by umbilical size and connectors

30 -50 MVA


36 kV Subsea switchgear Switchgear module mechanical design overview

Basis:

Two standard SF6 insulated vacuum breakers with it’s normal 1.5 bar pressure mounted inside pressure resistant canisters.



MV Penetrators

Special penetrators for electrical feed through bottom of each canister towards a fluid filled base.



Base module

A pressure compensated fluid filled, hermetically sealed base structure containing MV busbars, connectors and auxiliary equipment.



Truss work cages

Vacuum breakers



Control

Control system and protective relays are kept in a separate container, which can be located inside the canister,

or in the base module

as a retrievable unit outside,



Connectors

36 kV 800 A Inlet

36 kV 200 A Outlet

Instrument and auxiliary power

Optional 36 kV 800 A outlet to a second switchgear module



Handling arrangement

Lifting

Guide funnels

ROV Grabber bar


36 kV Subsea switchgear System components overview

Control system andProtection relays

Internal instruments

Current transformers

Voltage transformers

Pressure compensator for storage and installation

Pressure compensator for operation


36 kV Subsea switchgear Design data

Water Depth 3050m (10,000 ft) Design Primary Voltage (ph-ph and ph-gnd) 36 kV Number of Outputs 4 Max Power per Outputs 10 MWDesign Life 30 Years Operational Frequency Range 33 to 66 Hz Grounding Configuration Low Resistance Ground at topsideSeawater Temperature 4°C Design Temperature Range -5°C to 40°C Storage and handling Source Power Type Topside transformer Short circuit current (max.) 15 kA rms

Copyright © Siemens AG 2010. All rights reservedSlide 20

Subsea VSD Enclosure

TransformerThree 3-phase transformers.In the same enclosure as the VSD. Reducing weight and the # of connectors and penetrators.

VSD phase modules6 power cells in each phasemodule

9120

2720

2610

Approx. 53 Metric ton


Subsea VSD Enclosure

Pressure-CanisterThe control electronics are to be placed in two redundant pressure canisters inside the VSD, and are dimensioned for the maximum pressure.

Water detectionWater intrusion drip trays are mounted beneath the penetrators. A water detection system is installed in the drip trays.


Subsea VSD study Design data

Water Depth (m) 3050 m (10 000 ft)Max Distance to Load (km) 5

Nominal Operating Voltage (kV) 6,6

Power Output Requirement (MVA) 4,0

Cos motor, (power factor) TBD

Power Transmission 3Ø AC

Input Frequency Range (Hz) 50 – 60

Output Frequency Range (Hz) 0 – 100

Landing Speed 0.5m/s

Shock 3g

Ambient sea water temp. deg ºC 0-10Design life (Years) 30

Penetrator Specification Wetmate (Statoil Specification TD0153)


Power Management and Performance- / Condition Monitoring

To ensure and maintain the availability of the Subsea Power Grid, a dedicated Power management, performance/condition based monitoring system to be provided. Main functionality to be covered: Monitoring of Power Grid incl. equipment to facilitate cost saving, lifetime extension,

reduced maintenance and increased availability Network Control / Network monitoring (black-out prevention, load shedding/limitation, etc.)

Automated restart sequence after black out Operational key data statistics (key measurements, # of operations, peak current etc.)

Early detection of potential failures Reporting of graceful degradation of high available systems and components (typical loss of

power electronic cells in VSD etc.)

Model based prediction of remaining life (availability) of power systems and components Remote monitoring / Fault diagnosis, condition & performance reporting to topside/shore

operational center


Electric Power Control - topology

Onshore plant (or topside)

Fiber optic

SWGElectro Node

Topside

Electro Node

SCU Node

PCTA

PTPT

PT

SCM

UTH

VSD

SSU

Transf.

SCU

SWG SWG

Process system

Cable

Um

bilic

al

Power grid system

Communication and auxiliary power

Medium voltage powerDielectric fluidN2

NitrogenSF6

EPCU

Copyright © Siemens AG 2010. All rights reservedCopyright © Siemens AG 2010. All rights reserved

Electric Power Control - Concepts

Autonomous subsea electric power system

Loose coupled system - only required functional interaction between subsea process control system and subsea electric power system

Well defined standard high level interface (SIIS level 2) between subsea process control system (SCM) and subsea electric power system (EPCU)

Transparent Ethernet TCP/IP connectivity from EPCU to topside control system

Control, condition monitoring and power management functionality of subsea electric power system done by EPCU and topside electro node


No low level interfacing required - saves time and engineering cost

Standard high level interface between subsea process control system and subsea electric power system yields interoperability

Avoid unnecessary coupled system given by communication through subsea process control system (2 levels of tag mapping)

Autonomous subsea electric power system with seamless integration with Siemens topside control system yields an integrated total power management solution for the asset

Functionality in subsea electric power system may be modified in operation without involvement from subsea process control system vendor


Electric Power Control - Benefits


Subsea Standardization - InterfacesTopside

Profibus or Ethernetcommunication

Member of SIIS


Subsea Monitoring and Control Ethernet System Architecture


Well Control System Upgrade

Added functionality: Pressure Sensors Down Hole gauges Methanol injection Emergency shut down TFL position monitoring

Control system installed after XT installation

”Old” control system unchanged


Sea Bed Logging - Electromagnetic

Converters for Sea Bed LoggingSiemens have developed and built a power converter for performing offshore high accuracy electromagnetic surveys for finding hydrocarbons/oil.

Pressure exposed Power electronics

Design Requirements:- Water depth 3500m. - Endure pressure cycling- High current: 1500A

Experience:- Delivered units: 16- Survey hours: 25 170 h

(Numbers up to date 31.12.2008)


Subsea Transformer

PETROBRAS PROCAB Project

Subsea transformer in operation since 1998

- 3630 feet water depth- 750 kVA- 10.5 kV/3.5kV- For downhole consumer


Subsea Control References

Client Project Description

ABB Snorre B28 RF-subsea modems for production system communication 2000

Saga/Hydro Snorre B120 subsea control and electrical distribution units for downhole instrumentation (DIACS) 2001

Saga/ Hydro/ StatoilHydro Snorre UPA

15 subsea Well Control Units (WCU/MDU) 2000 - 2009 (Additional instrumentation brown field) From 2006 communication with 3 Mbps powerline modem

Statoil Snorre B 1 subsea Well Control Unit (WCU) 2002

Statoil Snorre B DIACS Field testing 2002/2003

Statoil Snorre UPA Control system feasibility study (WAG project) 2006

StatoilHydro Snorre B Sand monitoring Study 2008

StatoilHydro Snorre BSubsea control system for template C&D Sand monitoring of 16 wells 2009-2010

Statoil Snorre UPAReplacement of 1st generation SEMs -Feasibility Study 2009 (Class B study)

Additionally, Siemens has supplied several Master Control Stations to various projects interfacing all major subsea contractor’s systems.


We are happy to answer your questions!

Documents

OTC 2010 X-pert Center - Siemens Energy Sector · PDF fileKey trends & drivers for Subsea Power Longer step-outs Marginal and dispersed fields Deeper waters Heavier oil. O&G reserves