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Single 5-Spot, (or More) Pattern
Lab Core Flood Evaluation
• 3-6 Months Work• Scale; PV < 250 milliliters (0.001 bbls)• Cost ~ $200K• Justification: Essential Screening Step
• 3-5 Years Work• Scale; PV ~ 500,000 bbls• Cost ~ $10MM-$20MM• Justification: Oil in Tank
In-Situ TestReduce Further Risk
• 5-15 Years Work• Scale; PV ~ 10MM to >100MM bbls• Risk ~ $100MM-$400MM• Justification: Additional OOIP Recovery
TYPICAL EOR IMPLEMENTATION APPROACH
Field Wide or Expanded Flood Pattern
Single 5-Spot, (or More) Pattern
Lab Core Flood Evaluation
• 3-6 Months Work• Scale; PV < 250 milliliters (0.001 bbls)• Cost ~ $200K• Justification: Essential Screening Step
• One Month of Work• Scale; PV ~ 1,000 bbls• Cost ~ $150-200K• Justification: Establish EOR Target Oil
EOR Injectivity TestIn-Situ DemonstrationReduce Further Risk
BETTER EOR IMPLEMENTATION APPROACH
Field Wide or Expanded Flood Pattern
20-feet
H
Porosity = 0.25
Oil
EO
R S
LU
G
SWCT One-Spot-Pilot
00
Un-reactedEsterTracer
Volume Produced (bbls)
Product AlcoholTracer
Single Well Chemical Tracer Test Production Profile
0
200
400
600
800
1000
1200
1400
1600
1800
2000
0 500 1000 1500 20000
50
100
150
200
250
300C
once
ntra
tion
Trac
ers
(ppm
)
Con
cent
ratio
n Tr
acer
s (p
pm)
Qbß=
Qa
(1-Sor)Ki Sor
Ki= Ci(oil)/Ci(water)
Sor =
QaQb
= 1+ ß
(ß+ Ki)ß
Volume Produced (bbls)
Sor = Zero Case
ProductAlcoholTracer
Un-reactedEsterTracer
Con
cent
ratio
n Tr
acer
s (p
pm)
Con
cent
ratio
n Tr
acer
s (p
pm)
Volume Produced (bbls)
Sor = 0.10 Case(K= 5.0)
ProductAlcoholTracer
Un-reactedEsterTracer
Con
cent
ratio
n Tr
acer
s (p
pm)
Con
cent
ratio
n Tr
acer
s (p
pm)
Volume Produced (bbls)
Sor = 0.30 Case(K= 5.0)
ProductAlcoholTracer
Un-reactedEsterTracer
Con
cent
ratio
n Tr
acer
s (p
pm)
Con
cent
ratio
n Tr
acer
s (p
pm)
Pore Volume (PV)Calculation Basis
PV=πr2hΦ
Example: PV = (3.14)·(20 ft)2·(14.9 ft)·(0.30) = 5,614 ft3·0.1781 bbls/ft3 = 1,000 bblsπ r2 h Φ
h
r = 20 ft
Φ (porosity)
SWCT One-Spot Pilots Have Successfully Evaluated:
• ASP (12)
• Lignin-Surfactant-Polymer (2)
• Surfactant-Polymer (9)
• Lo-Sal Water Flood (62)
• Miscible Hydrocarbon / WAG (5)
• Carbon Dioxide (6)