6_mogi_gilio_presentation stage 2009 thin oil rim development
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oil rim development presentationTRANSCRIPT
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Thin Oil Rim Development
Author: Francesco Gilio
San Donato Milanese 20-21-22 October 2009
Master in Petroleum Engineering 2008-09
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Stage SubjectThin Oil Rim Development
San Donato Milanese 20-21-22 October 2009
Author
Ing. Francesco Gilio
Division Exploration & Production
Dept. MOGI/IPET
Company Tutors
Ing. Carlo Monico
Dott. Alberto Cominelli
University Tutor
Prof. Ing. Francesca Verga
Master in Petroleum Engineering 2008-09
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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Project Scope
Investigation on the use of horizontal well to develop a thin oil
rim in an actual field through numerical simulation
The purpose was to optimize the horizontal well by means of
sensitivity analysis, considering different development
scenarios
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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Reservoir Description - General information
E4
E2
W
G
O
• Off shore condition
• Two culminations (E2 and E4)
• Carbonate sequence with different formation characteristics
• Huge gas cap (very rich condensate fluid)
• Strong aquifer
• Saturated oil (34 °API) forming thin oil rims
• 17 m oil column
Development fluids scenarios:
• oil – only
• oil – gas
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Reservoir Description - Simulation Modeling
Full-field black oil model had been devised to study both culminations
A sector model was defined in a representative area of E2
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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Oil Well Definition
Sensitivities
- Depth
- Location
- Length
- Oil Rate
- Direction
Horizontal
Well bore diameter: 0.625 ft
Cased hole completion
Tubing: 3” 1/2
Production constraints
- Control ⇨ Oil rate
- WC max ⇨ 70 %
- Q gas max ⇨ 40x106 scf/d
- Q liquid max ⇨ 4500 stb/d
- THP min ⇨ 600 psia
- Q oil min ⇨ 100 stb/d
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Gas Well Definition
Vertical
Well bore diameter: 0.625 ft
Open hole completion
Tubing: 4”1/2
Production constraints
- Control THP ⇨ 600 psia
- WGR max ⇨ 0,2 stb/103scf
- Q gas max ⇨ 40x106 scf/d
- Q gas min ⇨ 5x106 scf/d
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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W
G
O
Local Grid Refinement - Simulation Grid Size Investigation
Different local grid refinements (LGR) sensitivities around a generic
horizontal well
• Horizontal 200 X 200 m
• Vertical 2 ÷ 10 m
Original grid size:
• Horizontal 2, 4, 5
• Vertical 2, 4, 6
LGR splits
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Local Grid Refinement Choice
0
60
120
180
240
200X200 100X100 - Z/2 50X50 - Z/2 50X50 - Z/4 40X40 - Z/4 40X40 - Z/6
LGR split type
CP
U t
ime
200X200
100X100 - Z/2
50X50 - Z/2
50X50 - Z/4
40X40 - Z/4
40X40 - Z/6
LGR Split Type
CPU
Tim
e h
ours
Local Grid Refinement
100X100
50X50
40X40
200X200Z/2
Z/4
Z/6
Z/4
Z/2
0
4
Local Grid Refinement - Choice Of Best LGR
Based on simulation results & CPU time
LGR ⇨ 50 X 50 m & z/2
200X200 finer grids 100X100
0 20
3
Years
10
6 S
tb
Cumulative Oil Production
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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Scenario 1 / Oil Development – Well Direction
Well A
Well B
Well C
W
G
O
Well dedicated LGRs
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Scenario 1 – Well A Depth Sensitivities
W
G
O
0.9
1
8350 8360 8370 8380
Depth (ft)
RF /
RF m
ax
Recovery Comparison
G
O
W
Years
10
6 S
tb
0 20
3 Cumulative Oil Production
optimal depth ⇨ 8370 ft
oil recovery ⇨ 2,5 x 106 Stb
Increasing Depth
Ranking based on recovery factors
normalised to maximum values
through the ratio RF/RFmax
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0
1
-1200 -600 0 600
Shift (m)
RF /
RF m
ax
Recovery Comparison
G
O
W
Scenario 1 – Well A Location Sensitivities
W
G
O
optimal location ⇨ 600 m SW
oil recovery ⇨ 3,7 x 106 Stb
4
Years
10
6 S
tb
0 20
Cumulative Oil Production
peripheral
original
crestal
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0.3
1
0 500 1000 1500 2000
Length (m)
Recovery Comparison
RF /
RF m
ax
G
O
W
Scenario 1 – Well A Length Sensitivities
5
Years
10
6 S
tb
0 20
Cumulative Oil Production
W
G
O
Range ⇨ 200 ÷ 2000 m
optimal length ⇨ 1000 m
oil recovery ⇨ 4,0 x 106 Stb
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0
1
2
3
4
5
0 1000 2000 3000 4000
10
6 S
tb
Rate (Stb/d)
Total Oil Recovery
Scenario 1 – Well A Oil Rate Sensitivities
optimal range ⇨ 1500 ÷ 2000 (Stb/d)
5
Years
10
6 S
tb
0 20
Cumulative Oil Production
Increasing Rate
Rate ⇨ 500 ÷ 4000 Stb/d
Length ⇨ 600, 1000 & 1400 m
600 m
1000 m
1400 m
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Scenario 1 – Well B
depth ⇨ 8365 ft
location ⇨ optimized
length ⇨ 600 m
oil rate ⇨ 1500 ÷ 2000 Stb/d
oil recovery ⇨ 3,3 x 106 Stb
Same workflow was applied to well B ⇨ orthogonal direction
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Scenario 1 – Well C
depth ⇨ 8365 ft
location ⇨ optimized
length ⇨ 1000 m
oil rate ⇨ 1500 ÷ 2000 Stb/d
oil recovery ⇨ 4,2 x 106 Stb
Same workflow was applied to well C ⇨ diagonal direction
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2
3
4
5
0 500 1000 1500 2000
Scenario 1 – Direction & Length Comparison
Length (m)
Total Oil Recovery
10
6 S
tb
Well A
Well C
Well B
Well C
Well B
Well A
• Highest recovery for any length
• Less length sensitive
Well C
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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Scenario 2 / Oil + Gas Development
gas well ⇨ fixed
oil well ⇨ same workflow
as scenario 1
Sensitivities
• Depth
• Location
• Length
• Oil Rate
• Direction
horizontal oil well
vertical gas well
Well A
Well C
Well B
W
G
O
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10
6 S
tb
0 20
2Cumulative Oil Production
10
Scenario 2 – Well A Depth Sensitivities
Years
Increasing Depth
Well Shut-in
0.8
1
8350 8360 8370 8380
RF /
RF m
ax
Recovery ComparisonG
O
W
Depth (ft)
optimal depth ⇨ 8370 ft
oil recovery ⇨ 1,7 x 106 Stb
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Scenario 2 – Well A Location Sensitivities
Years
10
6 S
tb
0 20
3 Cumulative Oil Production
0
1
-1200 -600 0 600Shift (m)
RF /
RF m
ax
Recovery Comparison
G
O
W
optimal location ⇨ 600 m SW
oil recovery ⇨ 2,3 x 106 Stb
peripheral
original
crestal
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0
1
0 500 1000 1500 2000Length (m)
Recovery Comparison
RF /
RF m
ax
G
O
W
Scenario 2 – Well A Length Sensitivities
Years
10
6 S
tb
0 20
3Cumulative Oil Production
Length ⇨ 200 ÷ 2000 m
optimal length range ⇨ 1200 – 1600 m
oil recovery ⇨ 2,3 – 2,5 x 106 Stb
1400 m
1200 m
1600 m
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Scenario 2 – Well A Oil Rate Sensitivities
Rate ⇨ 500 ÷ 4000 Stb/d
Length ⇨ 1200, 1400 & 1600 m
1
2
3
0 1000 2000 3000 4000
10
6 S
tb
Rate (Stb/d)
Total Oil Recovery
1600 m
1200 m
1400 m
0
0.2
0.4
0.6
0.8
1
0 1000 2000 3000 4000
Total Oil Recovery / Time
10
3 S
tb
Rate (Stb/d)
0
0.8
1.6
2.4
0 1000 2000 3000 4000
10
9 S
tb
Rate (Stb/d)
(Total Oil Recovery)2 / Time
highest recovery
slow recovery less performing
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Scenario 2 – Well B
depth ⇨ 8365 ft
location ⇨ optimized
length ⇨ 800 m
oil rate ⇨ 1500 ÷ 2000 (Stb/d)
oil recovery ⇨ 1,8 x 106 Stb
Same workflow was applied to well B ⇨ orthogonal direction
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Scenario 2 – Well C
depth ⇨ 8365 ft
location ⇨ optimized
length ⇨ 2000 m
oil rate ⇨ 1500 ÷ 2000 (Stb/d)
oil recovery ⇨ 2,5 x 106 Stb
Same workflow was applied to well C ⇨ diagonal direction
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1
2
3
0 1000 2000 3000
10
6 S
tb
Oil Rim Recovery
Length (m)
Scenario 2 – Direction & Length Comparison
Well C
Well B
Well A
Well A
Well C
Well B
Max Technical Length
• Well A gives higher recovery than C in the range 1200 – 1600 m
• Highest recovery at 2000 m for well C and 1600 m for well A
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List of Content
Stage SubjectThin Oil Rim Development
Project Scope
Reservoir Description
Wells Definition
Local Grid Refinement
Scenario 1
Scenario 2
Conclusions
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Conclusions
• Thin oil rim exploitation through horizontal well was studied considering two development scenarios: oil-only and oil + gas
• Sensitivities were performed with reservoir sector model on direction, depth, location, length and oil rate
• Oil recovery increases with distance of well from gas cap
• Locations close to WOC or too peripheral lead to reduction in oil recovery due to high water production
• Simultaneous gas and oil development leads to earlier shut-in due to faster depletion, aquifer reaction and consequent water arrival
• Oil only scenario gives 70-80% more recovery and requires shorter horizontal intervals for all directions
• Diagonal direction allows oil recovery being less length sensitive in case of oil only development
• Optimal position minimizes gas production and limits water arrival
• Maximum oil recovery obtained in case of oil only development through diagonally oriented 1000 m horizontal interval and 1500-2000 Stb/d oil rate
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Acknowledgements
I would thank Eni E&P Division Management for
permission to present this work and related results
and MOGI colleagues for the technical support and
needed assistance
San Donato Milanese 20-21-22 October 2009