DEVEX 9th May 2012 · 19952000 1996 1997 1998 Shell/Esso discovered Falcon with 210/25a-9...
Transcript of DEVEX 9th May 2012 · 19952000 1996 1997 1998 Shell/Esso discovered Falcon with 210/25a-9...
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How fast can a falcon fly?
DEVEX
9th May 2012
Peter Brand
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• Overview
• Timeline
• Appraisal
• Development
• Performance
• Potential
• Summary / Conclusions
Overview
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Overview - Location
Shetland
Islands
Tern
Kestrel
Falcon
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Overview
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Overview – ‘Tern North’
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1995 1996 1997 1998 2000 Shell/Esso discovered Falcon with 210/25a-9 exploration well
Timeline
1979 Shell/Esso licensed the area (P296)
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1999
2001 2002 2003 2004 2005 2006 2007 2008 TAQA bought the Tern field
•TAQA bought
the area
containing
Falcon
•Drill 210/25a-10
(explore ‘H’ block)
•Complete
project
•First oil •Drill 210/25a-10Z
(appraise Falcon)
•Run
completion
•Commence
subsea
development
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• Fallow acreage initiative?
• Field redetermination on economic grounds
– Possible to carve-out from the Tern PRT area
– IF Falcon had proved connected to Tern
• Small Fields Allowance
Timeline – Regulatory Enablers
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• Seismic section
• Well logs
• RFTs
• Faulting
• Appraisal plan
• Results
Appraisal
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Appraisal - Seismic section
Kimmeridge Clay
Heather
Base Mid Ness Shale
Cormorant 1
Paleosol
Basement
G Block H Block I Block Falcon
Abercromby
Tern Main
Field
NE SW
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Appraisal – Well Logs
TA05S1
ODT
8105 ft
TVDSS
210/25a-9
OWC
8500 ft
TVDSS
Plotted in TVD and hung on Base Mid-Ness Shale for thickness comparison
Upper
Ness
Lower
Ness
/Etive
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Appraisal - RFT data
25a-10z May10
Simulation model
provides reasonably
good match to depletion
data
Solid = measured
Open = simulated
E1 Dec97
P2 Jul01
TA05S1 Jan94
25a-9 May00 Pinit
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Appraisal - Tern and Tern North faulting
F G H
I
Main Tern Field
IOWC 8258’
Internal faults can seal up to
1200psi ΔP on production
Initial oil fill - Partially sealing fault compartments
filled down past their individual spill points – fill and spill
Partial sealing becomes evident during production
Tern initial seal requirement is 120psi
(1450’column, ΔP oil/water 0.08pis/ft)
Tern North
220’ column - seal requirement 18psi
G Block
IOWC
8117’
Falcon
IOWC 8500’
F-G and I-Falcon are major sealing faults,
with Brent/Brent but no ‘good res’ connection
G-H and H-I faults are lesser faults, with minor
‘good res’ juxtaposition towards their crests
Juxtaposition caused by anticlinal flexure
towards fault block crests
8120’
8500’
8258’
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• Updip targets from old well with indications of
oil in Upper Ness
– First branch to H block, upside location
– Second branch to NE of old well, with higher
CoS, planned as keeper
• Fast Track ‘Appraise while developing’
• Avoids winter working
• Fast track procurement, based on delivery
• Significant pre-sanction commitments
• Approval cycle discussed with DECC
Environmental
• Deliveries discussed with key suppliers
Appraisal - Plan
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• H-block well wet
• Falcon N well
– (210/25a-10Z)
– 23’ shallow to prognosis
– 20’ more net reservoir
– Slightly higher porosity
• so higher permeability
– 5’ deeper OWC
Appraisal - Results
Falcon S Falcon N
Plotted in TVD and hung on Base Mid-Ness Shale for thickness comparison
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• Modelling
• Schematic
• Development plan
• Lessons
Development
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• New seismic interpretation
• 2 new wells
• Structurally quite complex – 79 faults
• Property modelling relatively simple
• 100m x 100m x 20 layers for simulation
• Primary purpose: Falcon development plan
• Secondary purposes: Kestrel and G-block development planning
Development - Modelling
Falcon South
Falcon North
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Development - Modelling
• Oil in place: Falcon South 13 mmbbl Falcon North 18 mmbbl
Kestrel
G BlockFalcon
H I
Kestrel
G BlockFalcon
H I
Preliminary initialization
of new reservoir model
(oil saturation)
North
Tern Main ‘L’
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Development - Schematic
• Also considered:
– Tie-in at Kestrel SSIV (near Tern)
– New riser at Tern
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• Approvals schedule not under TAQA control
• Kestrel back-out estimation
• Cost growth due to high industry activity
• Schedule
– Drill rig availability for 2011 completion
– Tight schedule to first oil date (tree, controls, pipe, umbilical)
• Operability/Integrity
– Limitations of existing subsea umbilical for deploying chemicals for flow assurance
– Operability/integrity risks on existing Kestrel infrastructure, which had been in use
since 2001
• Additional risks
– Uncertainties on the initial flow rate and recoverable reserves
• After thorough analysis the cheapest route, via Kestrel, was selected
Development - Key project risks, May 2010
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Development - Plan
• Approach
• Keep it simple
• Minimise impact on platform
• Minimise CAPEX
• Scope
• Complete well and run subsea xmas tree
• Install new production and gas lift pipelines and an umbilical
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• Scope growth in platform modifications
• Late addition of Kestrel flexible riser replacement
• Obsolescence of Kestrel controls infrastructure identified late
• Subsea construction/installation required extra TAQA support
• Start-up was delayed by incomplete instrumentation commissioning
• Entire Appraisal-Development project under budget
• First oil < 1 month late compared to stretch target
Development - Lessons
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• Oil rate
• Water cut
• History match: pressure
Performance and forecasts
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• Has exceeded expectations so far
Performance – oil rate
oil rate
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
May
-12
Nov
-12
May
-13
Nov
-13
May
-14
Nov
-14
May
-15
Nov
-15
May
-16
Nov
-16
May
-17
Nov
-17
bo
pd
'Low' case
'Base' case
'High' case
Actual
New forecast
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• Is similar to predictions
Performance – water cut
water cut
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
Jul-1
1
Jan-
12
Jul-1
2
Jan-
13
Jul-1
3
Jan-
14
Jul-1
4
Jan-
15
Jul-1
5
Jan-
16
Jul-1
6
Jan-
17
Jul-1
7
'Low' case
'Base' case
'High' case
Actual
New Forecast
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• Matched with additional aquifer strength and internal reservoir connectivity
Performance - pressure
Well Falcon North Bottom Hole Pressures
0
500
1000
1500
2000
2500
3000
3500
Jul-11 Jul-11 Aug-11 Sep-11 Oct-11 Nov-11 Dec-11 Jan-12 Feb-12 Mar-12 Apr-12 May-12 Jun-12
Pre
ss
ure
(p
sia
)
Model
Actual
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• Plan: Drill Abercromby prospect (next fault block north)
– Risk 1 – fault seal
– Risk 2 – migration
• Option: Drill Falcon 2nd producer and/or injector
– Depending on performance
– Maintaining history matched model
Potential
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• Operability/integrity risks on existing Kestrel infrastructure,
which has been in use since 2001
• Uncertainties on the initial flow rate and recoverable reserves
Summary / Conclusions
• First oil schedule met (almost). On budget
• On reflection the schedule was very aggressive in a busy market
• This timeline would not be achievable today (longer regulatory timeframes,
even tighter services markets)
• Better than expected performance (better reservoir)
• Encouraged to explore further
• Considering further development
• Key project risks: – Approvals schedule not under TAQA control
– Kestrel back-out estimation
– Cost growth due to high industry activity
– Schedule • Drill rig availability for 2011 completion
• Tight schedule to first oil date (tree, controls, pipe, umbilical)
– Operability/Integrity • Limitations of existing subsea umbilical for deploying chemicals for flow assurance
• Operability/integrity risks on existing Kestrel infrastructure,
which has been in use since 2001
– Additional risks • Uncertainties on the initial flow rate and recoverable reserves
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• TAQA Bratani Ltd
• TAQA - project team
• ADIL - development planning support
• DECC - fast turnaround of approvals
Acknowledgements
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Bill Buchanan/USFWS
Finally, by the way
• How fast can a Falcon fly?
– RSPB: 60 mph (level flight)
– BBC: >180 mph (diving)
– National Geographic: 242 mph (diving)
– TAQA: acquisition to first oil in 22 months
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Performance – Pressure Build-up Analysis
• Kh : 36000 mDft
• K : 148 mD
• Pwsi : 2970 psia (July 2011)
• Rectangle with const. Pressure Boundary
• Rectangle Size: 2220 x 7620 ft
• Rectangle Pore volume 170 MMbbl
Well Location
Const Pressure
(Kestrel)