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Wyoming EORI 3nd Annual Wyoming CO 2 Conference 6/23/09 The Beaver Creek Field Madison CO 2 Project Spring 2009 Update Chuck Peterson, PE Sr. Advisor - Reservoir Engineering Beaver Creek Field Madison CO 2 Flood Project Presentation

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Wyoming EORI 3nd Annual Wyoming CO2 Conference 6/23/09

The Beaver Creek Field Madison CO2 Project – Spring 2009 Update Chuck Peterson, PE –

  • Sr. Advisor - Reservoir Engineering
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NYS E: DVN www.devonenergy.com page 2

Beaver Creek Field Madison CO2 Flood Project Presentation Overview

Geographic S etting Geologic and Reservoir setting Field History Final Proj ect Design Proj ect Construction Flood S tatus & Response

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CO CO2

2 Floods in Wyoming

Floods in Wyoming

Merit Energy Wertz/Lost Soldier Anadarko Patrick Draw Monel Unit Anadarko Salt Creek Field Devon Beaver Creek Field

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Beaver Creek Madison Structure Beaver Creek Madison Structure

10 15 16 9

Approximate Oil - Water Contact

  • 5

7

  • 5

7 6 5

  • 3

6

  • 6

2 00 1 6

  • 1

6

  • 6
  • 6
  • 5

9 9 5

  • 8

5

  • 5

8

Active Oil Producer Active Water Injector

W

43 17 31 22 55 40 38 44 32 66 41 68 11 56 14 39-M 45 46 30 42 52 34 57 69 77 81 96 107 104 117 127 124 137 136 139 143 146 147 FEET

1,518

PETRA 12/13/2005 5:04:00 PM

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

  • F

BHPi = 5301 psia GORi = 288 scf/bbl Bubble Pt. = 673 psia Swi = 10% Oil Gravity = 39.5

  • API

Type Log

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Madison Log Section

GR/ Bulk Density

BCU #127 Well Top @ 11224’ MD Bottom @ 11723’ MD

Madison Base F Zone Top E Zone Top D Zone Top C Zone Top B Zone Top A Zone Top

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Beaver Creek Madison Unit Production History

10 100 1,000 10,000 100,000 Jan-50 Jan-60 Jan-70 Jan-80 Jan-90 Dec-99 Dec-09 Monthly Volumes (Bpd, Mcfd) Oil Gas Water WINJ

Main Block (Target) OOIP = 109 MMbo Cum Oil = 42.5 MMbo (39% OOIP) Rem Primary/Secondary = 2.6 MMbo

Beaver Creek Madison Beaver Creek Madison Pre Pre-

  • CO

CO2

2 Flood Production History

Flood Production History

Discovered January 1954 Waterflood initiated in 1959 Developed with 36 completions

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Flood Plan Peripheral CO2

  • WAG

14 Injectors: 8 WAG injectors 6 CO2 injectors 16 Producers 12 Shut-in or producing from other formation or TA

Detail: 3 well conversion (prod->Inj): 44, 146, 143 8 old producers: 11, 38, 41, 46, 68, 147, 66, 81 2 shut-in: 14, 96 6 old injectors: 40, 17, 30, 32, 45, 139 7 new producers: D, E, F, G, H, I, J, L 4 new injectors: A, B, C, K 1 Injector reactivation: 31 1 Producer reactivation: 77

57 61 34 40 42 43 56 55 69 22 77 39 127 11 38 41 44 46 66 68 81 143 146 147 14 17 30 32 45 96 139

ctive ctor tive Low confidence inside this area

us

C B A D E F H J G I K L

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  • Convert 2 wells from producer to injector
  • Rework or recomplete 9 producers & 7 injectors
  • Drill 7 new producers & 5 new injectors
  • Construct Production & Injection Facilities
  • Install New Flowlines for Producers & Injectors
  • Build CO2 Supply Pipeline

Flood Preparation Work Requirements

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Where Are We At Today?

Construction & Wellwork

CO2 source pipeline completed & tested S

pring 2008

Inj ection facilities completed S

pring 2008

Production facilities completed Fall 2008 Drilling, completion and other wellwork completed Fall 2008 Recycle compressors installed and on line S

pring 2009 CO2 Flood Process

CO2 Inj ection initiated July3, 2008 10.7 Bcfg inj ected to date Flood response observed in 7 of the 16 producers CO2 indications observed in 9 if the 16 producers Continued monitoring of production data and adj usting our flood Flow rate adj ustments Gas distribution adj ustments

Madison CO2 Flood Status

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Madison CO2 Flood Production

0.10 1.00 10.00 100.00 1000.00 10000.00 100000.00 January-2007 January-2008 January-2009 January-2010

Water (Bwpd) Oil (Bopd) Well count Oil Cut (%)

Initiated CO2 Injection 7/3/08

Pre-Flood 320 Bopd 32000 Bwpd Current Rate 1200 Bopd 22000 Bwpd

Oil Cut Increase from 1% to 5%

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Madison CO2 Injection Response 6/09 Oil Production Increase

7 6 900 6 900 6800 6 7 00 6 6 6 50 6 4 6 300 6 2 6 7 6 7 6 6 6 6 8 6 7 6 6 6 5 6 4 6 3 6 2 6 2 6 1 6 1 6 6 6 9 5 9 5 5 9 8 5 5 8 7 5 7 5 6 5 6 5

10 9

58 BCU 147 BCU 146 BCU 143 BCU 139 82 BCU 66 BCU 32 BCU 44 300 BCU 38 BCU 40 BCU 17 BCU 96 104 BCU 81 BCU 77 BCU 11 BCU 68 161 BCU 41 BCU 30 35 BCU 46 BCU 10-22 BCU 10-12 BCU 10-42 BCU 10-43 BCU 10-32 BCU 10-33 BCU 10-23 BCU 10-21 BCU 31 BCU 45 BCU 10-12-2 5 BCU 10-13 BCU 10-41X BCU 10-22-2

G G G G G G G G G

FEET

1,017

Zone: MADISON - WELL_UTILITY [CAP] Contains "wag" Zone: MADISON - WELL_UTILITY [CAP] Contains "giw" Zone: MADISON - WELL_UTILITY [CAP] Contains "prod"

PETRA 6/16/2009 5:11:02 PM
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Madison CO2 Injection Response 6/09 Produced Gas CO2 %

7 6 9 6 900 6800 6 7 6 6 6 5 6 4 6 300 6 2 6 7 6 7 6 6 6 6 8 6 7 6 6 6 5 6 4 6 3 6 2 6 2 6 1 6 1 6 6 6 9 5 9 5 5 9 8 5 5 8 7 5 7 5 6 5 6 5

10 9

11 3/09

BCU 147 BCU 146 BCU 143 BCU 139

88 6/09

BCU 66 BCU 32 BCU 44

80 6/09

BCU 38 BCU 40 BCU 17 BCU 96

84 6/09

BCU 81

1 6/09

BCU 77

61 6/09

BCU 11

95 6/09

BCU 68

86 6/09

BCU 41 BCU 30

90 6/09

BCU 46 BCU 10-22 BCU 10-12 BCU 10-42 BCU 10-43

2 3/09

BCU 10-32

1 6/09

BCU 10-33

1 6/09

BCU 10-23 BCU 10-21 BCU 31 BCU 45

1 3/09

BCU 10-12-2

93 6/09

BCU 10-13 BCU 10-41X

62 3/09

BCU 10-22-2

G G G G G G G G G

FEET

1,017

Zone: MADISON - WELL_UTILITY [CAP] Contains "wag" Zone: MADISON - WELL_UTILITY [CAP] Contains "giw" Zone: MADISON - WELL_UTILITY [CAP] Contains "prod"

PETRA 6/16/2009 6:09:36 PM
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BCU 10-41 Injection Wellhead

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2 Well Pad Location BCU 10-33 & BCU 10-41

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CO2 Injection Header

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Production Header

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8” CO2 Supply Pipeline Delivery Point

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CO2 Recycle Compression

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Recycle Compression Facility

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Storage Tanks / Dehydration

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Separation/Dehydration Facility

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Separation Vessels

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Production Facility Building

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Production Facility Building

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Managing Start-up Operations

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Thank You.