Eor Presentation Simgap
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Transcript of Eor Presentation Simgap
EOR Technique Presentation
Simultaneous Injection of Miscible Gas and Polymer to improve Oil
Recovery and Sweep Efficiency from Layered Carbonate Reservoirs
Present by Mr.Wasin Saengnumpong
SPE 129645: Shehadeh K. Masalmeh, H. Hillgartner, R. Al Mjeni, X.D. Jing (2010)
Contents
Problem assessment & motivation
Objective
Study Approach
Results & Discussion
Conclusion
Problem Assessment
Highly heterogeneous oil-wet carbonate and layered reservoir
Part of the Oman oil fields
UPPER ZONE: STOIIP = 40%
LOWER ZONE: STOIIP = 60%
KU > KL
Problem Assessment & Past studied
Masalmeh et al., 2004, 2007, 2008 : Waterflooding performance
Problem: Low sweep eff. For lower zone due to the “Water override phenomenon” is caused by capillary forces which act as a vertical barrier and counteracts gravity force in case where permeability varies between layers for mixed to oil-wet reservoirs.
Problem Assessment & Motivation
Are there any way to increase the vertical sweep eff. and consequently the total oil recovery ?
Objective
To Compare different IOR/EOR technique including
1. Water flooding
2. Gas injection
- Acid gas (75% H2S and 25% CO2)
- CO2
- Methane
3. Simultaneous injection of gas and water
- Water and Miscible gas
- Viscous water (Polymer) and Miscible gas (SIMGAP)
By Using the Numerical Reservoir Simulation
Study Approach: Reservoir Simulation
Simulation Model Description
Cut-out 3-D history matched reservoir model: 25×25×48 Blocks, 20×20 m/block
Vertical Well: Inverted 5 spot
x
y
Horizontal Well at bottom half of the lower zone
x
z
Study Approach: Reservoir & fluid properties
Properties of reservoir fluids and injected gases at res. Conditions of pressure and temperature
Pi = 4200 psi
Tres = 250 F
Formation water salinity > 200,000 ppm
Results
Part 1 Water flooding & Gas injection
Part 2 SIMGAP
Comparison of IOR/EOR technique
Result Part 1
Oil recovery factor of Upper & Lower zone
Result Part 1
Total recovery
Result Part 1
(4)
(4)
R=2 R=4 R=7
(4)
(4)
Total oil recovery factor : SWAG
Discussion Part 1
Problem : Displacing phase trend to migrate upward to Upper zone (Low pressure gradient zone)
UPPER ZONE: Low P/L
LOWER ZONE: High P/L
Discussion Part 1
Solution : Control P/L condition
UPPER ZONE: Low P/L
LOWER ZONE: High P/L
(P/L)LOWER =< (P/L)UPPER
We can increase W
Result Part 2
Part 1 Water flooding & Gas injection
Part 2 SIMGAP
Comparison of IOR/EOR technique
Introduction to SIMGAP
Pressure Gradient control
=
(P/L)LOWER =< (P/L)UPPER
First condition
Increase W by using Polymer (Viscosified Water)
Introduction to SIMGAP
Second condition : Water front must slightly move faster than gas front
=
Introduction to SIMGAP
Second condition : Water front must slightly move faster than gas front
=
Result and Discussion Part 2
Physical scale
Recovery factor : Simultaneous Injection of Acid Gas and Polymer
Result and Discussion Part 2
Physical scale
Recovery factor : Simultaneous Injection of CO2 and Polymer
Conclusion
1. Water flooding and gas injection lead to poor sweep of the lower zone for this kind
of reservoir.
2. SWAG give a little advantage over water injection, but this come with early gas
break-through, and high cost of gas handling.
3. SIMGAP shows significant sweep of the lower zone and lead to high oil recovery
compare to water flooding this method also has much lower water cut and GOR
compared to water flooding and gas injection, respectively.
4. SIMGAP method can adjust the viscosity of injected fluid and injection rate to
control sweep performance of different heterogeneity levels.
5. SIMGAP need more detail study such as chemical properties under reservoir
conditions, complexity of geological and the pilot testing before implement on real
field in order to ensure the successful of a project