Beaver Creek Madison Reservoir Management and Conformance

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1 Beaver Creek Madison Reservoir Management and Conformance Veronica Chodur Devon Energy Corporation Presented at the 5 th Annual Wyoming EORI CO 2 Conference July 13-14, 2011 Casper, WY

2 Presentation Outline General Field Info and History Performance & Reservoir Management Conformance NYSE: DVN page 2

3 Basin Outline and Field Location Wyoming Wind River Basin Beaver Creek area NYSE: DVN page 3

4 Madison Reservoir Characteristics Geologic Characteristics Limestone/Dolomite Matrix Approx. Prod. Area = 974 Acres Approx. Oil Column Height = 820 Avg. Net Pay Thickness = 212 Avg. Depth to Madison Top = 11,100 Reservoir Characteristics Porosity = 10% Permeability = 9 md Reservoir Temp = 234 o F BHPi = 5301 psia GORi = 288 scf/bbl Bubble Pt. = 673 psia Swi = 10% Oil Gravity = 39.5 o API NYSE: DVN page 4

5 Stratigraphic Column and Typelog Madison is subdivided into 4 zones, with the D zone being the primary producing zone Madison Ls NYSE: DVN page 5

6 Monthly Volumes BPD / (Bpd, MCFD Mcfd) Beaver Creek Madison Production History Beaver Creek Madison Unit Production History 100,000 10,000 1,000 Oil Gas Water WINJ First Production 1955 Peak Rate 8500 bopd Waterflood initiated in 1962 OOIP = 109 MMbo Cum Oil (prim + sec) = 42.5 MMbo Remaining Reserves (WF) = 2.6 MMbo Jan-50 Jan-60 Jan-70 Jan-80 Jan-90 Dec-99 Dec-09 NYSE: DVN page 6

7 BPD / MCFD IWR Madison CO 2 Flood Production Results Initiated CO 2 Injection 7/3/08 Pre-Flood 300 Bopd Current Avg Rate 4200 Bopd NYSE: DVN page 7

8 Madison CO 2 Flood Current Oil & Water Rates by Well Oil Rates (bopd) Gas Rates (Mcfd) NYSE: DVN page 8

9 Madison CO 2 Flood Current GOR & GLR Rates by Well NYSE: DVN page 9

10 Madison CO 2 Flood Current CO 2 & Water Injection Rates by Well NYSE: DVN page 10

11 Actual vs. Modeled Oil Production MMBO Net Reserves Anticipated NYSE: DVN page 11

12 Major Regions 3 Region 1: (Up-dip Continuous CO 2 Front) Region 2: (Central & Down-dip WAG) 2 1 Region 3: (Down-dip WAG ) 4 Region 4: (Lower Block) page 12

13 IWR BPD / MCFD Region 1 1 NYSE: DVN page 13

14 Reservoir Pressure Observation Well NYSE: DVN page 14

15 IWR BPD / MCFD Region 2 2 NYSE: DVN page 15

16 IWR BPD / MCFD Region 3 3 NYSE: DVN page 16

17 Madison CO 2 flood Reservoir Management Simulation Updates - History match actual CO 2 flood performance Optimize Flood Performance - Improved rate and reserve forecasting - Optimize reservoir and operating pressures - Forecast Impact of Various Operating Scenarios (Well Placement, WAG Ratio, Slug Size, CO 2 Utilization, Conformance) NYSE: DVN page 17

18 Cumulative CO 2 Purchase Utilization vs Time NYSE: DVN page 18

19 Injection Profiles vs Time (BCU 40) NYSE: DVN page 19 H2O CO2

20 Zone A NYSE: DVN page 20

21 Zone B NYSE: DVN page 21

22 Zone C NYSE: DVN page 22

23 Zone D NYSE: DVN page 23

24 Madison CO 2 Flood Reservoir Management Unexpected production response in the BCU #124 Re-evaluated Seismic & Geo-Model NYSE: DVN page 24

25 Beaver Creek Seismic Coverage Riverton, Wyoming 3D survey outline Riverton Dome Beaver Creek Seismic Line A A NYSE: DVN page 25

26 Original 3D vs. Reprocessed 3D Seismic Line A-A Fault was previously un-defined on seismic Fault separates upper Madison block from lower Madison block. Primary objective (Madison LS) Primary backthrust fault Original Vector processing NYSE: DVN page 26 Excel processing using DMI PSTM

27 NYSE: DVN page 27

28 NYSE: DVN page 28

29 Well 124 responds to CO 2 injection well 139 BCU #139 injector BCU #124 producer NYSE: DVN page 29

30 The Madison CO 2 zone is in the lower SE plate at both wells Area of Overlap BCU #139 injector BCU #124 producer NYSE: DVN page 30

31 IWR BPD / MCFD Region 4 4 NYSE: DVN page 31

32 Thank You.