friday 2 nd of march 2012
DESCRIPTION
Photo courtesy of Howard Johnson. Wytch Farm Field Development Project. Friday 2 nd of March 2012. TEAM B. Mohammed Alshawaf , Lanray Hammed Bakare , Francsico J. Barroso Viseras , Aristeidis Karamessinis , Ha Nguyen and Shi Su. Introduction. Cultural information - PowerPoint PPT PresentationTRANSCRIPT
Friday 2nd of March 2012
Photo courtesy of Howard Johnson
Wytch Farm Field Development Project
TEAM BMohammed Alshawaf , Lanray Hammed Bakare, Francsico J. Barroso Viseras, Aristeidis Karamessinis,Ha Nguyen and Shi Su
2
Introduction
11.8km
Wytch Farm Field
Google Earth, 2011
Cultural information• Location Dorset, Wessex Basin (50°69’,-1°98’)
44 km2, onshore and offshore• Environment outstanding beauty, tourism,
wild life
Geological overview• Reservoir Sherwood Sandstone• Seal Mercia Mudstone• Source Lias Formation• Play type Tilted fault blocks
Underhill & Stoneley, 1988Source
SealReservoir
Cultural information• Location Dorset, Wessex Basin (50°69’,-1°98’)
44 km2, onshore and offshore• Environment outstanding beauty, tourism,
wild life
Field appraisal
Depth 1585 mPressure 2400 psig
Oil column thickness 39 mAreal extend 40 km2
API gravity 38.1° @ 15°CGOR 320 scf/stb
P90 P50 P10
STOIIP (MMbbl) 580 795 1040
Reserves (MMbbl) 215 290 385
Geological overview• Reservoir Sherwood Sandstone.• Seal Mercia Mudstone• Source Lias Formation• Play type Tilted fault blocks
• Producers 1X-02, 1D-02• Appraisal wells 3• 3D seismic survey
Wytch Farm - Development phase - Team B
Aims and Objectives
Develop the geological model
Investigate viable development options
Assess associated static and dynamic uncertainties
Propose a development and production plan
Justify additional data acquisition requirements
3
Wytch Farm - Development phase - Team B
Drive mechanism determination
• Limitations of material balance
• Oil expansion and aquifer drive are the most plausible• No assumption can be validated
4
0 20,000 40,000 60,000 80,000 100,0000
200
400
600
800
1000
1200
f(x) = 0.0040445729247098 x + 644.549764938038
Aquifer and solution gas
ΔP/Eo [psi.stb/rb]
F/Eo
[10^
6 st
b]
0 0.001 0.002 0.003 0.004 0.005 0.006 0.0070
500,000
1,000,000
1,500,000
2,000,000
2,500,000
f(x) = 276813886.39531 x + 340856.777006015
Solution gas and compaction drive
Eo + Ef [rb/stB]
F [r
b]
N=300 MMBblN=645 MMBbl
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Wytch Farm - Development phase - Team B
Recovery mechanism
Primary recovery• Low primary recovery: 4.6%
=> secondary recovery methodsSecondary recovery• Water injection preferred• Gas injection not advised: under-saturated oil and low GOR
Possibility of using artificial lift
5
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Building the simulation model
• Main assumptions
– Input Fine model (2.5M cells)– Upscaled properties Φ, facies, Kh and Kv
– Fluid model Dead oil, relative permeabilities Capillary pressure neglected for simplification purposes– Output coarse model (82,000 cells, 8 faults)
6Coarse horizontal permeability model within Flooding event 1Fine horizontal permeability model within Flooding event 1
Fine hor. permeability model - Sector Coarse hor. permeability model - Sector
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Wytch Farm - Development phase - Team B
Upscaled model consistency
7
Static properties
Geology
Volumetrics
Upscaled properties
kh, kv
Φ
Facies
Dynamic properties
Cumulative production
Bottom-hole pressure
Oil saturations
Sweep efficiency
Water cut
Coning water
Numerical diffusion
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Coarse model consistency(history match)
• Oil rates: good match• Water rates: calibrate the model
• Limits: well history, no flow controlWytch Farm - Development phase - Team B 8
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Development strategy
Parameter Constraint Solution
Drilling strategy
Number of wells Recovery factor vs economics
25 producers / 10 injectors
Schedule Rates and rigs 2 wells/m
Well location Geology and oil distribution Uniform
Production strategy
Plateau Maximise recovery & 5% recovery 3-year plateau
Water injection Pressure maintenance After 15 m
Production time Lease 25 years
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Wytch Farm - Development phase - Team B
10
Development strategy results
• 3-year plateau• Injection starts after 15
months• 345 MMBbl recoverable• 43% recovery factor
based on P50
STOIIP 795 MMBblRecovered 345 MMBbl
STOIIP (MMBbl)
Recovered (MMBbl)
Recovery factor
P90 580 239 41%
P50 795 345 43%
P10 1 040 452 43%
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Sweep efficiency analysis
11
Water breakthroughStart of water injection
• Injection after 15 months• 89% sweep efficiency achievable over 25 years
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Wytch Farm - Development phase - Team B
Uncertainty analysis
12
• Approach combines both static and dynamic parameters
• Parameters considered
GRVPorositySw
kH, kV
Corey parametersSor, Swc, Swcr
Transmissibilities
Static properties
Dynamic properties
GRV
Oil relative permeability
Horizontal permeability
Oil residual saturation
Connate water saturation
Vertical permeability
Porosity
Water saturation
Water relative permeability
Faults transmissivity
Critical water saturation
-35% -25% -15% -5% 5% 15% 25% 35%
Tornado ChartDeviation basecase cumulative production (%) De
velo
p m
odel
Inve
stiga
te
optio
nsAs
sess
unc
erta
intie
sPr
opos
e pl
anJu
stify
dat
a ac
quisi
tion
Reducing uncertainties
Data acquisition plan Reprocess seismic data Coring of the first few wells
SCAL Logging Fluid analysis
GRV
Oil relative permeability
Horizontal permeability
Oil residual saturation
Connate water saturation
Vertical permeability
-35% -25% -15% -5% 5% 15% 25% 35%Deviation from base case (%)
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Wytch Farm - Development phase - Team B 14
Conclusions
Number of wells 25 producers / 10 injectors
Drilling schedule 2 wells/mWell location Uniform
Plateau 3-year plateau
Water injection After 15 mProduction time 25 years
High recovery factor
High sweep efficiency
Only water injection used
Good understanding of
uncertaintiesRecovered (MMBbl) Recovery factor
P90 239 41%
P50 345 43%
P10 452 43%
Wytch Farm - Development phase - Team B 15
Thank you
Any questions ?
Wytch Farm - Development phase - Team B 16
Geology and upscaled properties: facies
Fine grid Coarse grid Deve
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Wytch Farm - Development phase - Team B
Volumetrics QC
17
2.8%1.4%
0.8%
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Wytch Farm - Development phase - Team B
Upscaled properties: kh
Fine grid
18
Coarse grid
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Wytch Farm - Development phase - Team B 19
Upscaled properties: Φ
Porosity distribution: Fine vs Coarse grid
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%
Wytch Farm - Development phase - Team B 20
Cumulative production
- Fine grid
- Coarse grid
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Wytch Farm - Development phase - Team B 21
Bottom-hole pressure
- Fine grid- Coarse grid
Injectors Producers
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Wytch Farm - Development phase - Team B 22
Oil saturations
Fine grid Coarse grid
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23
0 0.1 0.2 0.3 0.4 0.5 0.6 0.70
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
Coarse Fine One to One line
tD (pore volume injected)
NpD
(por
e vo
lum
e pr
oduc
ed)
Sweep efficiency
Wytch Farm - Development phase - Team B
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Wytch Farm - Development phase - Team B
Water cut
24
- Fine grid
- Coarse grid
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Wytch Farm - Development phase - Team B 25
Coning water
Fine grid Coarse grid
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Wytch Farm - Development phase - Team B 26
Numerical diffusion
Fine grid Coarse grid
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Wytch Farm - Development phase - Team B 27
History match per well
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28
Rig #Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
Rig-1
Rig-2
WFP-19
WFP-1
To January 1, 2037
WFP-13
WFP-10
WFP-11
WFP-5
WFP-21
WFP-16
WFP-14
WFP-23
WFP-24
WFP-7
WFP-2
WFP-18
WFP-9
WFP-17
WFP-4
WFP-16
WFP-22
WFP-12
WFP-20
Dec-12
WFP-8
Jun-12 Jul-12 Aug-12 Sep-12 Oct-12 Nov-12Dec-11 Jan-12 Feb-12 Mar-12 Apr-12 May-12
Drilling schedule
Priority based on rate and rig location (two rigs: E, W)
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Wytch Farm - Development phase - Team B 29
Well location
Well positioning based on the geology and the properties (kh)
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Wytch Farm - Development phase - Team B 30
Water injection strategy
Water injection after 15 months in order to ensure pressure maintenance
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Wytch Farm - Development phase - Team B 31
Buckley-Leverett analysis
0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.80
0.10.20.30.40.50.60.70.8
Relative Permeability Graph
krwkro
Sw
Kr
0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.80
0.2
0.4
0.6
0.8
1
1.2Fractional Flow Curve
fwTangent Line
Sw
fw
0 1 2 3 4 5 60.3
0.350.4
0.450.5
0.550.6
0.650.7
0.750.8
Sw against VD
VD
Sw
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 20
0.2
0.4
0.6
0.8
1NPD Against tD
One to One Line
1-Swc-Sor
Buckley-Leverett
Simulation
tD
NPD
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Wytch Farm - Development phase - Team B 32
0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Relative permeability
Krw - Corey water:1.5Krw - Corey water: 1.8Krw - Corey water:5Kro - Corey oil/water:2Kro - Corey oil/water: 2.5Kro - Corey oil/water:5.5
Sw
Kr
Relative permeability analysis
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