The big boost for subsea gas fields Knut Nyborg - VP …€¦ · Subsea compression ... Avoid water accumulation in flowline by boosting flow ... connectors & Jumpers Pump motor penetrator

part of Aker

© 2008 Aker Solutions

Subsea compression

The big boost for subsea gas fields

Knut Nyborg - VP Power & Process/Presented by Morten R Pedersen

© 2008 Aker Solutions part of Aker to edit this text Slide 2

Topics

■ Rationale of subsea processing and subsea compression

■ The journey to industrialize subsea gas compression

● From Kvaerner Booster Statoil to Ormen Pilot

■ Åsgard – the first subsea gas compression system

■ Compact wetgas compression system for smaller gas fields

■ Åsgard SCS – the movie


Summary

■ Aker Solutions and its clients have industrialised subsea compression for long step-out, deep water (3000 ft) and large volumes (25 – 60 MW)

■ The Ormen Pilot is the single largest development and qualification programme in the subsea industry and is now nearing its completion

■ The Åsgard SCS will be the worlds first subsea compression system when it is installed in 2014

■ The business case for subsea compression looks promising for most large subsea gas fields

■ Aker Solutions is now focusing on the development of a more compact and smaller subsea compression system for medium and small gas fields


Topics








Extend field life/ Increased oil recovery (IOR)

■ Reduce/overcome back pressure ● Single/multiphase boosting

● Subsea separation

● Gas compression

■ Cost effective pressure support ● Seawater injection

Gap in recovery from

subsea fields

Platform fields Subsea fields

Gap 30-

40%

Normal, Unboostedproduction

Enhanced Production, Early Boosting

ReducedOPEX

BoostedProduction

Rate

[bpd

]

Time [years]

Normal, Unboostedproduction

Enhanced Production, Early Boosting

ReducedOPEX

BoostedProduction

Rate

[bpd

]

Time [years]


Benefits of subsea compression

■ Cost effective development solution (CAPEX and OPEX)

■ Increased production

■ Enhanced reservoir recovery

■ Safer operation due to unmanned operation

■ Avoid water accumulation in flowline by boosting flow

Longer plateau and increased recovery

at Ormen Lange (Courtesy of StatoilHydro)

Ormen Lange Subsea

Compression 2015 -

Åsgard Subsea

Compression 2014 -

@ StatoilHydro @ StatoilHydro

0

10

20

30

40

50

60

70

1 4 7

10

13

16

19

22

25

28

31

34

Calender year after startup(1 = Jan 1 2008, 2 = Jan 1 2009 etc)

Ga

s p

rod

uc

tio

n a

nd

sa

le (

e6

Sm

3/d

ay

)

wo compression:

294e9 Sm3

GIIP=528e9 Sm3

w compression:

+97e9Sm3 = 391e9 Sm3

0

10

20

30

40

50

60

70

1 4 7

10

13

16

19

22

25

28

31

34

Calender year after startup(1 = Jan 1 2008, 2 = Jan 1 2009 etc)

Ga

s p

rod

uc

tio

n a

nd

sa

le (

e6

Sm

3/d

ay

)

wo compression:

294e9 Sm3

GIIP=528e9 Sm3

w compression:

+97e9Sm3 = 391e9 Sm3


Increased production and enhanced reservoir recovery

Well

(size and depth)

Riser

(size and

Waterdepth)

Flowline (size and Step-out)


Phase 1: Natural production (depletion)

Well

(size and depth)

Riser

(size and

Waterdepth)



Phase 2, Alt 1: Topside compression

Well

(size and depth)

Riser

(size and

Waterdepth)


c m


Phase 2, Alt 2: Riserbase compression

Well

(size and depth)

Riser

(size and

Waterdepth)

Flowline (size and Step-out) c m


Phase 2, Alt 3: Subsea compression close to the wells

Well

(size and depth)

Riser

(size and

Waterdepth)

Flowline (size and Step-out) c m

Get close to wellhead by

using subsea compressors !


Topics








1987

Idea to Subsea compressor/pump

station 1985

KBS 1993

We started in the 80’s !


Possible 2012-2015

Subsea Compression roadmap History & possible future

2001-03

Demo 2000

Project

Ormen Lange

Subsea

Compression

Station

Ormen Lange

Subsea

Compression Pilot

2006-2010

Ormen Lange

critical component

qualification program

2004-06

KBS Project

1989-93

Pilot testing

2010-2012


Ormen Lange Subsea Compression Pilot project

Option: 2012-1015

Subsea Compression Station

■ 4 compression trains

■ Tie-back 120 km

■ Design water depth 900 m

■ 70 MSm3/sd of gas production

■ 58 MW total electrical power

2006 – 2011

Subsea Compression Pilot

■ Identical to one of the 4 trains for OL subsea compression station

■ 12,5 MW compressor unit

■ 400 kW pump unit

■ 2 year testing at Nyhamna

■ Objective: Mature and qualify a viable subsea compression alternative to the base case platform


Fabrication, assembly and testing at Aker Egersund

Integration work

Module assembly

Fabrication


Integration of HV power equipment (Compressor VSD)


Completing system integration test (SIT)


Subsea modules and equipment

Separator module

Compressor

module

VSD module

Pump module

UPS modules Circuit breaker

module

Cooler module

Subsea control

system

Main suppliers: Aker Solutions (Aberdeen, Tranby), Converteam, GE Oil&Gas, Aker Midsund, Poseidon, Ifokus, ConSepT,

ABB, Deutsch, Tronic, Ifokus

C:/Data/Business Development/London Technology day/Sept2010 London Technology Day/Master_wSound_720p_.wmv


Topics








Åsgard subsea compression system (SCS)

Åsgard Subsea Compression System (SCS) comprises:

Subsea compressor station (SCSt)

Subsea compressor manifold station (SCMS)

Subsea transformer station

Topside power and control system

Subsea compression station w/ 2 identical ”compression trains”, each comprising:

Multiphase gas coolers

Separator / scrubber

Compressor

Subsea power and control units

Pump


Åsgard Field Layout


25

Åsgard - Ormen Lange Comparison

Stjødal Trondhei

m Kristiansund

Molde Ålesund

PL208

ICELAND

DENMARK

SCOTLAND

~200 km

Midgard

Smørbukk

Smørbukk

South

• Shut in pressure 220 bar

• High power – 2 x 10 MW

• Flow rate 21 MSm3/d

• 2 compressors

• 50 km, 250 m water depth

• Topside frequency converter

• Shut in pressure 255 bar

• High power – 4 x 12,5 MW

• Flow rate 60 MSm3/d

• 4 compressor

• 120 km, 850 m water depth

• Subsea frequency converter


Gas

veloc

ity

Time for minimum flow

Year

Lower limit for stable flow

Gas velocity = f(pressure and flow rate)

Corrective measures

To maintain stable flow in a multiphase production system, the system needs to be operated in a way in that accumulation of liquids is not causing a dynamic problem, i.e. the flow velocity has to be maintained above a minimum.

Minimum Flow Remediation


Overall Schedule

FEED

K-lab upgrade

TQP

EPC

Pilot testing

2010

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

2011 2012 2013 2014

DG2 DG3 DG4

Topside Modification

PUD

Testing


Åsgard – Subsea scope

SCMS: Subsea Compression Station Manifold

SCtS: Subsea Compression Station

RTM: Riserbase Transformer Module


Scope of supply - Compressor system

11 kV50 Hz

Topside VSDs

Subsea Compressors and

pumps

Topsides Subsea

Step-down

transformerFrequency

Converter

Sine

filter

Step-up

transformer

Platform

Switchboard Power umbilical

Combined in

one umbilical

Subsea Step-down

transformer

M P

12MW/6.6kV

Compressor

500kW/2.8kV

Liquid pump

HV cable

termination

Transformer

penetrator Transformer

penetrator

Compressor

penetrator

HV cable

termination

CM

If required

If required

cable spliceEarth switch

Wet mate

connectors

& Jumpers

Pump motor

penetrator

PZT01

A

PZT01

B

PT01

A

PT01

B

PCS

SEMA

B

A

B

A

B

A

B

Topside Controller

PCS

Topside Controller

PSD

PSD

SEM

PCS / PSD CM system

segregated subsea

(sensors)

PCS /PSD/CM system

segregated topside

PCS /PSD/CM system

segregated subsea

(SEM)

PCS / PSD/CM system

segregated

(communication)

PT02

Topside

CM server

CM

SEM

SCM

Topside

Subsea

45 km HV power distribution system

All electric compressor control system Subsea compressor station

-2 + 1 spare compressor trains -Coolers (inlet and export)

-Scrubber

-Compressor

-Pump

-UPS

-UTA w/step-down

transformers


2 + 1 spare Compressor trains

Inlet & Antisurge

Cooler Module

(5x9x7m – 75t)

Separator Module

( 6x7x13m – 175t)

Flexible Compressor

Module

(6x7x12m – 175t)

Pump module

(4x3x7m – 30t)

Export Cooler

Module

(5x10x5m – 40t) Train SCM

AMB SCM

AS SCM


Significant synergies between Ormen Pilot and Åsgard SCS


2+1 Compressor modules + (1 pilot Compressor unit)

■ Compressor unit ready tested from Compressor vendor including AMB electronic

■ AMBCM assembled and tested from Aker Solutions

■ HV Connection system, valves, actuators, instruments, jumpers etc. from qualified and nominated subvendors

■ Integration, assebly, module FAT at Egersund -> ready for SIT

■ Option:

● 1 compressor unit directly to testing in K-Lab (“Pilot unit”) Integration and

assembly under

controlled environment

in new Hall


Topics








Compact Compression Aker Solutions Subsea GasBooster

■ 6 MW unit

■ Minimised number of mechanical and electrical connections

■ Separately retrievable control module and actuators

■ Compact and low weight

Footprint: 4 m x 4 m

Height: 7 m

Weight: 100 tonnes


Topics








Copyright

Copyright of all published material including photographs, drawings and images in this document remains vested in Aker Solutions and third party contributors as appropriate. Accordingly, neither the whole nor any part of this document shall be reproduced in any form nor used in any manner without express prior permission and applicable acknowledgements. No trademark, copyright or other notice shall be altered or removed from any reproduction.


Disclaimer

This Presentation includes and is based, inter alia, on forward-looking information and statements that are subject to risks and uncertainties that could cause actual results to differ. These statements and this Presentation are based on current expectations, estimates and projections about global economic conditions, the economic conditions of the regions and industries that are major markets for Aker Solutions ASA and Aker Solutions ASA’s (including subsidiaries and affiliates) lines of business. These expectations, estimates and projections are generally identifiable by statements containing words such as “expects”, “believes”, “estimates” or similar expressions. Important factors that could cause actual results to differ materially from those expectations include, among others, economic and market conditions in the geographic areas and industries that are or will be major markets for Aker Solutions’ businesses, oil prices, market acceptance of new products and services, changes in governmental regulations, interest rates, fluctuations in currency exchange rates and such other factors as may be discussed from time to time in the Presentation. Although Aker Solutions ASA believes that its expectations and the Presentation are based upon reasonable assumptions, it can give no assurance that those expectations will be achieved or that the actual results will be as set out in the Presentation. Aker Solutions ASA is making no representation or warranty, expressed or implied, as to the accuracy, reliability or completeness of the Presentation, and neither Aker Solutions ASA nor any of its directors, officers or employees will have any liability to you or any other persons resulting from your use.

Aker Solutions consists of many legally independent entities, constituting their own separate identities. Aker Solutions is used as the common brand or trade mark for most of these entities. In this presentation we may sometimes use “Aker Solutions”, “we” or “us” when we refer to Aker Solutions companies in general or where no useful purpose is served by identifying any particular Aker Solutions company.

Documents

The big boost for subsea gas fields Knut Nyborg - VP …€¦ · Subsea compression ... Avoid water accumulation in flowline by boosting flow ... connectors & Jumpers Pump motor penetrator