Integrated Reservoir Study for Designing CO 2 -Foam EOR Field Pilot

Transcription

1 Integrated Reservoir Study for Designing CO 2 -Foam EOR Field Pilot Universitetet i Stavanger uis.no M. Sharma*, Z. P. Alcorn #, S. Fredriksen # M. Fernø # and A. Graue # * The National IOR Centre of Norway, University of Stavanger # Department of Physics and Technology, University of Bergen

2 Outline Pilot Program Field Overview Laboratory Studies Reservoir Modelling & Simulation Conclusion 2

3 Pilot Program OBJECTIVE Cost-effective roadmap for mobility control CO 2 EOR implementation on Norwegian Continental Shelf through onshore field trials in Texas, USA Foam for Mobility Control Gravity segregation Reservoir heterogeneity Viscous instability 3

4 Multi-scale Approach 4

5 Outline Pilot Program Field Overview Laboratory Studies Reservoir Modelling & Simulation Conclusion 5

6 Field Overview Mature carbonate reservoir Remaining oil saturation: 30 40% Water Injection Infill Drilling CO 2 Injection CO 2 breakthrough 6 Primary Secondary Tertiary

7 Pilot Site Focus on well pair I1 P5 Part of 40-acre pattern Short interwell distance Representative geology CO 2 breaks through within a year 7

8 Outline Pilot Program Field Overview Laboratory Studies Reservoir Modelling & Simulation Conclusion 8

9 Gas velocity Laboratory Studies Steady-state foam rheology V gas Foam quality, f g = V gas + V liquid High quality (nearly) Newtonian Pressure gradient (psi/ft) Gas Liquid L dp Low quality Shear thinning Liquid velocity Ref: Alvarez, J. M., Rivas, H. J., and Rossen, W. R. Unified Model for Steady-State Foam Behavior at High and Low Foam Qualities. SPE Journal, 6: ,

10 Gas velocity Laboratory Studies Foam quality scan Pressure gradient (psi/ft) Fixed Total velocity, Varying Foam quality Low quality High quality Liquid velocity 10

11 Foam Model Empirical model Gas permeability in presence of foam Gas permeability in absence of foam k f rg = k nf rg FM Mobility Reduction Factor FM = 1 + fmmmob arctan epdry(s w fmdry π 1 11

12 Foam Model Parameters for pilot-scale simulation fmmob : 180 fmdry : 0.4 epdry :

13 Outline Pilot Program Field Overview Laboratory Studies Reservoir Modelling & Simulation Conclusion 13

14 150 ft Reservoir Characterization Available data Petrophysical well logs RCA (porosity, permeability, Sw) Core photo (for 1 well in pilot area) Cyclical sequence of carbonate rocks Consists dolostones, packstones and grainstones Geologic framework based on flow zones and cyclicity I1 P5 14

15 Geologic Model Spatial distribution of petrophysical properties using stochastic simulation 85,000 active cells 50 ft x 50 ft areally Permeability 15

16 Swelling Test* Viscosity * Differential Liberation Expansion* PVT Model PR EoS (8 components) tuned for available PVT data *Circle represents Measured data, Line represents EoS calculation 16

17 Simulation Model PVT Model Relative Permeability Geomodel Foam Model Local Grid Refinement Well Inflow 17

18 Historical Water Injection hist q WI1 4 WI1 P1 WI2 hist q WI2 2 WI3 hist q WI3 2 P5 P3 I1 (P6) P4 hist q WI4 4 WI4 WI5 WI6 hist q WI5 2 q WI6 hist 4 BO Model (Includes peripheral injectors) Focus on updating volumes, and interwell permeability

19 Waterflood Match: Cum Oil Produced Base HM Observed 19

20 CO 2 Injection Simulation 4 years of CO 2 injection Gas b/t in all pilot producers hist q GI1 4 GI1 P1 WI1 hist q WI1 2 Compositional model Composition based on PVT report GI2 hist q GI2 2 P5 P3 I1 P4 Initialization from HMed waterflood Pressure and Saturation (O/W) hist q WI2 4 WI2 GI3 WI3 hist q GI3 2 q WI3 hist 4 History matching in progress 20

21 Outline Pilot Program Field Overview Laboratory Studies Reservoir Modelling & Simulation Conclusion 21

22 Summary Foam behaviour at core scale captured using fit-for-purpose lab studies and models An integrated approach for reservoir modelling and simulation allows to incorporate all available data Looking ahead Calibrate model for CO 2 injection period Baseline survey Optimal injection strategy 22

23 Acknowledgements We acknowledge the Research Council of Norway CLIMIT program for financial support under grant number CO 2 Storage from Lab to On-Shore Field Pilots Using CO 2 -Foam for Mobility Control in CCUS and the industry partners; Shell E&P, TOTAL E&P and Statoil Petroleum AS. We acknowledge the Research Council of Norway and the industry partners; ConocoPhillips Skandinavia AS, Aker BP ASA, Eni Norge AS, Maersk Oil Norway AS, DONG Energy A/S, Denmark, Statoil Petroleum AS, ENGIE E&P NORGE AS, Lundin Norway AS, Halliburton AS, Schlumberger Norge AS, Wintershall Norge AS of The National IOR Centre of Norway for support. We also acknowledge the Norwegian Metacentre for High Performance Computing (NOTUR) for support to perform this work on the Abel Cluster, University of Oslo. 23

24 Integrated Reservoir Study for Designing CO 2 -Foam EOR Field Pilot Universitetet i Stavanger uis.no M. Sharma*, Z. P. Alcorn #, S. Fredriksen # M. Fernø # and A. Graue # * The National IOR Centre of Norway, University of Stavanger # Department of Physics and Technology, University of Bergen

25 25

26 Waterflood Match: Water-cut Base HM Observed 26

27 Waterflood Match: Permeability change Layer - 4 Layer - 7 Layer - 8 Base PermX PermX Change 27

28 Waterflood Match: Permeability change Layer - 10 Layer - 16 Layer - 19 Base PermX PermX Change 28

29 Reservoir Pressure on higher side! 29

30 Reservoir Setup 2 zones because of structural tilting / seal breach event: MPZ (Main Pay Zone) Primary & Secondary recovery Original oil accumulation ROZ (Residual Oil Zone) Large amount of immobile oil (20-40%) Effects of structural tilting / seal breach Zones differ in fluid composition 30

31 Well Connectivity 2-3 MMscf/d 4 months *