doc id © chevron 2007 chemical eor implementation for the captain field, uk 30 th iea eor symposium...
TRANSCRIPT
DOC ID© Chevron 2007
Chemical EOR Implementation for the Captain Field, UK
30th IEA EOR Symposium and WorkshopSeptember 2009Anette Poulsen, Chevron Upstream Europe, Aberdeen, Scotland
September 2009
Outline
1. Background
2. Project Definition
3. Strategy
4. Pilot Objectives and Deliverables
3
Location:Block 13/22a, UK North Sea.
First Oil 1997: 12 years production history
Current gross oil production: 40,000 bbls/ day.
Equity:
85%
15%
Captain Field Location
Captain Development Discovered 1977
Early development challenges
Multiple platforms and over 300 vertical wells!
Early 1990ies technology advances
Horizontal drilling and ESP development
Successful EWT – 1993
1997 installed WPP & FPSO, first oil
2000 expansion project: BLP and subsea Area B template installed
2006 Captain Area C - further 2 subsea well development 4km east of Area B template
Polymer injection facilities installed as part of original development
Captain Infrastructure
OWC -3028
OWC -3251
OWC -2921OWC -2982
GOC -2799 GOC -2723
UCSUCSUCS
LCS LCS LCS
Wick
S-UCS
-3500’
-2500’
-3000’
Ross CentralRoss Central
Lower Captain Sandstone Lower Captain Sandstone
OWC -2992
Area AArea A
Captain Ridge
0 2km
Ross
Devonian
Upper Captain SandstoneUpper Captain Sandstone
West RossWest Ross
Southern
Terrace
Southern
TerraceGas CapGas Cap
Ross SandstoneRoss Sandstone
LCS EastLCS East
Area A WPPArea A WPP Area B TemplateArea B Template
Ross EastRoss East
Far EastFar East
BurnsBurns
Area C ManifoldArea C Manifold
Eastern ExtensionEastern Extension
Captain Reservoir X-Section
Upper Captain Sandstone : Sheet-like deepwater sandstone,
Lower Captain Sandstone : Channelised deepwater sandstone,
Ross/Burns Sandstone : Fluvial/ shallow marine sandstone.
Captain Waterflood Performance
Volumetric sweep
Injection water slumps down, under-running oil column
Water cones up to producers from OWC or under-running water
Significant hydrocarbon volumes by-passed
Microscopic sweep
Poor SCAL data (unconsolidated rock)
Large uncertainty in ROS and Sorw
Outline
1. Background
2. Project Definition
3. Strategy
4. Pilot Objectives and Deliverables
Captain Long Term Development Project
Long Term Development Sub-Projects – Chemical EOR
Positives
Exceptionally high permeability
Low temperature, moderate salinity
Medium to high oil acidity
Challenges
Heavy/viscous oil
High hardness (Ca, Mg ions in formation water)
Offshore (impact on facilities, brown field modifications)
Key Issues
Incremental sweep
Chemical compatibility and chemical performance
Offshore space/weight/POB constraints
Existing equipment suitability/conditions
Project Definition
Opportunity Statement:
To develop an integrated Chemical EOR Field and Reservoir strategy and timely implementation plans to increase ultimate recovery in order to develop P4–
P6 resources into the proved developed reserves category.
Success Vision:
Economically implement chemical EOR in Captain to achieve at least 50% recovery factor in all reservoirs
where chemical EOR will be applied
Impact on Life of Field
Polymer Flood EOR Potential for Upper Captain Sand
0
20
40
60
80
2000 2005 2010 2015 2020 2025
Oil
Pro
du
ctio
n (
Mbo
pd)
EOR likely to extend Captain
field life
UCS MAIN
UCSPOLYMER FLD
ADDITIONALDEVELOPMENT& EXPANSION
Polymer Flood EOR Potential for Upper Captain Sand
0
20
40
60
80
2000 2005 2010 2015 2020 2025
Oil
Pro
du
ctio
n (
Mbo
pd)
EOR likely to extend Captain
field life
UCS MAIN
UCSPOLYMER FLD
ADDITIONALDEVELOPMENT& EXPANSION
Outline
1. Background
2. Project Definition
3. Strategy
4. Pilot Objectives and Deliverables
EOR Strategy
Evaluate suitable chemicals (polymer and ASP) for Captain
Implement pilot polymer flood project using existing equipment on the Captain facilities
Follow by ASP flood if viable
Develop reliable forecasting tools and evaluate full field implementation
Implement EOR scheme on Captain
Outline
1. Background
2. Project Definition
3. Strategy
4. Pilot Objectives and Deliverables
Pilot Objectives
Demonstrate polymer flood technical feasibility in Captain field
Early identification of potential showstoppers
Provide data to evaluate economic viability for further expansion
Reduce range on key uncertainties
Meet above objectives within desired timeframe
Key Uncertainties
Ability to ship, mix, filter and inject polymer offshore, in the North Sea
Well injectivity
Increase in sweep efficiency, oil cut and oil production rate
Chemical usage
Impact on production efficiency
Operability of facility
Pilot Strategy Table
2x2x
1 No pilots, only injectivity tests2 No pilots, no injectivity tests, start full field engineering now3 Single pilot with multiple injectivity tests4 Resolution of all key reservoir uncertainties5 Resolution of all key reservoir uncertainties in an aggressive time frame6 Resolution of top two key reservoir uncertainties
UCS
5
6
1
2
3
4
2
0Fastest but high risk
Addressing Key Uncertainties
Injectivity Tests
1 SUCS
Shortest lead time to full field expansion decision (only one key reservoir uncertainty addressed)
Just do full field expansion now
Maximum Information - Minimum Lead Time
Maximum Information - Minimum Risk
ReservoirPilot Timing
n/a
Ross
LCS
none
Pilots
1
0
4
Simultaneous Pilots
Overlapping series of Pilots
contained oil
none
aquifer
variation in deposition, rock
and fluid properties
Key Reservoir Features
gas cap3 or more
2
Sequential series of Pilots
3
Project Milestones
Water injectionbaseline 4Q09
The Last Slide