Monell Unit CO 2 Flood

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1 Monell Unit CO 2 Flood Patrick Draw Field Sweetwater County, Wyoming May 29 th, 2008 Prepared by: Jason Gaines Senior Reservoir Engineer

2 APC Forward Looking Statement This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of Anadarko believes that its expectations are based on reasonable assumptions. No assurance, however, can be given that such expectations will prove to have been correct. A number of factors could cause actual results to differ materially from the projections, anticipated results or other expectations expressed in this presentation. Anadarko cannot guarantee that it will successfully execute on its exploration, drilling and a development plans. See Risk Factors in the company s s 2007 Annual Report on Form 10-K K and other public filings and press releases. Anadarko undertakes no obligation to publicly update or revise any forward-looking statements.

3 Anadarko s Wyoming EOR Assets Fields Monell Salt Creek Sussex Land Grant Gas Fields Oil Fields Third Party CO 2 Pipeline APC CO 2 Pipeline Sussex Pipelines 33 mile, mile, Salt Creek CO 2 Supply XOM Shute Creek 8 Monell

4 Monell Overview General Facts & History Discovered in 1959 ~115 MMBOOIP (prod 40 MMBO) 2001: Initiated pilot 2003: 33 mile PL & 1 st CO 2 injection 2006: Ph2 start-up 2007: NGL plant commissioned 2008: 9-spot drlg program ( 9 wells ) 2009: Ph3 development Active WS Future 2 1 WS Planned sequestration of 85 Bcf CO 2 Current Status 3,000 BOPD 48 MMCFD CO 2 injection 39 CO 2 injectors CO 2 -EOR cumulative of 3 MMBO WS Ph ,963 FEET

5 Upper Cretacous Stratigraphy Lance Formation Fox Hills Sandstone Upper Cretaceous Lewis Shale Almond Formation Ericson Sandstone Rock Springs Fm Blair Fm Mesaverde Group

6 West-East Cross Section Patrick Draw Field Table Rock ft 2000 Normal Fault Lance Lewis Almond Fort Union Wasatch mi Sea Level

7 Monell Unit Upper Almond Reservoir Monell Unit Type Log MONELL UNIT 49 SN ILD MNOR SPNORM CILD MINV Lewis Shale UA-5A Pay 4500 UA-5B Pay Lower Almond 4550

8 Reservoir Highlights Cretaceous Mesaverde Almond SS stratigraphic trap Barrier island/tidal channel inlet/shoreface depositional system Very fine to fine-grained lithic, illitic, kaolinitic, and quartzose sandstones 20% Porosity, 30md Permeability, 40% S wi 5 deg. dip, 25 Net Pay, 5,000 Acres at 4,500 depth Fractures and faulting are minor Oil zone confined up-dip by the depleted low pressure gas cap and down-dip by permeability pinchout ~115 MMSTB OOIP, 500 GOR, 43 deg. API sweet 20% Primary RF, 14% Waterflood RF 1,800 psi original reservoir pressure at 120 deg.f CO 2 Miscible with Oil (1450# MMP)

9 Monell Unit Phase Development Phase 1 Phase 2

10 Development Highlights Phase 1 implemented adding first 28 patterns of development Water curtain concept proven up as affective pressure barrier Horizontal 1: MU 43-27H - 5,000 lateral water injection well Horizontal 2: MU 44-27H - 6,800 lateral water injection well Four vertical water injection wells to the north Flood response seen within 3 months of initial injection Phase 2 implementation added 12 patterns of development Applied lessons learned from Phase 1 to Phase 2 Drilling, Completions, Facilities NGL plant installed and processing recycled CO 2 to recover NGL s Monitor/idle wellbores converted to producers to test 9-spot concept Drilling campaign under way to test 9-spot pattern performance Future phase development planning currently under way

11 Operations Highlights Drilling Currently drilling with coiled tubing drill rig Completions 50/50 lease crude and diesel frac fluid Wellbores Injectors: 5-1/2 casing; 2-3/8 IC tubing; Ni coated packer; inconell tubing hanger Producers: Pumping: 5-1/2 csg; 2-7/8 CS tubing; continuous sucker rod; 456 PU Flowing: 5-1/2 csg; 2-3/8 IC tubing; Ni coated packer; inconell tubing hanger; H20 slip-stream line at wellhead Flowlines Injection/Production: Continuous HDPE Headers Latest design (A2) includes central injection/production manifolds in common facility

12 Operations Highlights

13 Operations Highlights

14 Operations Highlights

15 Operations Highlights

16 Operations Highlights

17 Operations Highlights

18 Operations Highlights

19 Operations Highlights

20 Monell Unit Performance

21 PATRICK DRAW FIELD, MONELL UNIT CO2 FLOOD PROJECT PERFORMANCE Sep-59 Sep-61 Sep-63 Sep-65 Sep-67 Sep-69 Sep-71 Sep-73 Sep-75 Sep-77 Sep-79 Sep-81 Sep-83 Sep-85 Sep-87 Sep-89 Sep-91 Sep-93 Sep-95 Sep-97 Sep-99 Sep-01 Sep-03 Sep-05 Sep-07 Sep-09 Sep-11 Sep-13 Sep-15 BPD, MCFD Sep-17 Monell Unit Production History Primary Secondary Tertiary CO2 Flood Oil Gas CO2 Inj

22 Monell Unit Performance 100, MMcfdi 10,000 Pilot st CO 2 Inj Sept.03 3,000 bopd BPD, MCFD 1, Oil Production History 10 CO2 Inj History 1 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09

23 Monell Unit 9-Spot Type Well 250 Monell 9-Spot Review Oil Production BOPD #6Well #7 Well #14 Well #17 Well #18 Well #121Well #157Well Type Well Normalized Time (days)

24 Monell Unit 9-Spot Drilling

25 Monell Unit Future Development Ph Active Ph2 3 WS 2 Future 1 6 WS WS Ph ,963 FEET

26 Monell Unit Applied Tools Field/Pattern surveillance (OFM) Dimensionless curves developed to help forecast performance Allows pattern comparison and balancing Will help identify problem patterns Bottom Hole Pressure Tool Surface Injection Pressure Calculates BHIP from SIP using phase envelope P & T segments Assures that we remain below fracture pressure at all times CO 2 Injection Schedule Developed to aid in balancing patterns and CO 2 utilization Automated system that can be controlled by volume and/or pressure Production Allocation Tool Ensure that production is allocated correctly from well test data Reservoir Simulation History Matching

27 Monell Unit Applied Tools Recovery Factor RF_for_PI_II PATTERN: Phase 1&2 Patt_11-35 PATTERN: Phase 1&2 Patt_13-25 PATTERN: Phase 1&2 Patt_13-35 PATTERN: Phase 1&2 Patt_15-25 PATTERN: Phase 1&2 Patt_22-2 PATTERN: Phase 1&2 Patt_22-25 PATTERN: Phase 1&2 Patt_22-26 PATTERN: Phase 1&2 Patt_22-3 PATTERN: Phase 1&2 Patt_22-35 PATTERN: Phase 1&2 Patt_22-36 PATTERN: Phase 1&2 Patt_24-25 PATTERN: Phase 1&2 Patt_24-26 PATTERN: Phase 1&2 Patt_24-3 PATTERN: Phase 1&2 Patt_24-35 PATTERN: Phase 1&2 Patt_31-3 PATTERN: Phase 1&2 Patt_31-35 PATTERN: Phase 1&2 Patt_33-25 PATTERN: Phase 1&2 Patt_33-26 PATTERN: Phase 1&2 Patt_33-3 PATTERN: Phase 1&2 Patt_33-34 PATTERN: Phase 1&2 Patt_33-35 PATTERN: Phase 1&2 Patt_35-25 PATTERN: Phase 1&2 Patt_35-3 PATTERN: Phase 1&2 Patt_35-35 PATTERN: Phase 1&2 Patt_42-25 PATTERN: Phase 1&2 Patt_42-26 PATTERN: Phase 1&2 Patt_42-3 PATTERN: Phase 1&2 Patt_42-34 PATTERN: Phase 1&2 Patt_42-35 PATTERN: Phase 1&2 Patt_44-25 PATTERN: Phase 1&2 Patt_44-26 PATTERN: Phase 1&2 Patt_44-3 PATTERN: Phase 1&2 Patt_44-34 PATTERN: Phase 1&2 Patt_44-35 PATTERN: Phase 1&2 Patt_51-3 PATTERN: Phase 1&2 Patt_53-25 PATTERN: Phase 1&2 Patt_53-27 PATTERN: Phase 1&2 Patt_53-3 PATTERN: Phase 1&2 Patt_ Anadarko Petroleum Company PATTERN: Patt_24-26 Patt_24-26 Daily Oil Rate ( bbl/d ) Daily Gas Rate ( Mcf/d ) Daily Water Rate ( bbl/d ) Daily CO2 Volume ( Mcf ) PDB Daily Prd CO2 Volume ( Mcf/d ) RatioGORCO2d ( Mcf/bbl ) HCPVinj Date

28 Monell Unit Applied Tools Anadarko Petroleum Corporation MONELL UN Well Name: Monell Unit Well Depth SIP SIT 4, Tgrad 0.00 F/ft Monell Unit Depth Temp Davg Depth Pressure Bottom Hole Pressure Monell Unit , , ,299 1, ,758 1, ,218 1, ,678 1, ,137 1, ,597 1, psi/ft ,000 1,500 2,000 2, ,000 1,500 2,000 2,500 3,000 Well Name: Monell Unit Monell Unit ,500 Well Depth 10 SIP SIT 4,597 1, Tgrad F/ft 4,000 4,500 1,933 Rate 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 Depth Temp Davg Depth Pressure Bottom Hole Pressure , Monell Unit , , ,379 2, ,839 2, ,299 2, ,758 2, ,218 2, ,678 3, ,137 3, ,597 3, psi/ft ,000 1,500 2,000 2,500 3,000 3,500 4, MONELL UN Daily Inj Water Volume ( bbl ) Daily CO2 Volume ( Mcf ) Rate 05 1,749 mcfd ,503 Date Date Stamp ,000 Date Stamp

29 Monell Unit CO2 In Action PATRICK DRAW FIELD, MONELL UNIT CO2 FLOOD PROJECT PERFORMANCE Sep-59 Sep-61 Sep-63 Sep-65 Sep-67 Sep-69 Sep-71 Sep-73 Sep-75 Sep-77 Sep-79 Sep-81 Sep-83 Sep-85 Sep-87 Sep-89 Sep-91 Sep-93 Sep-95 Sep-97 Sep-99 Sep-01 Sep-03 Sep-05 Sep-07 Sep-09 Sep-11 Sep-13 Sep-15 BPD, MCFD Sep-17 Primary Secondary Tertiary CO2 Flood Oil Gas CO2 Inj

30 Salt Creek Overview General Facts & History Discovered in late 1800 s ~1.7 Bbbl OOIP (0.7 Bbbl cum prod) 9 productive intervals & 4,400 total wells 2003: Completed pilot, Ph1 & 125 mile PL 2004: 1 st CO 2 injection 2005: Ph2 start-up 2007: Ph3-4 start-up 2008: 2Q Ph5 start-up Flowing producers identical inj/prod set-up Planned sequestration of 660 Bcf CO 2 Current Status 7,000 BOPD from CO 2 ( 8,500 BOPD total ) 320 MMCFD CO 2 injection 153 CO 2 WAG injectors ( 20-acre 5-spots ) CO 2 -EOR cumulative of 5.5 MMBO SALT CREEK SOUTH UNIT Ph1-2 Future Development Ph3-4 Town of Midwest 1 6 SALT CREEK LIGHT OIL UNIT 19 Ph Ph6 Ph Scale = 1 mile

31 Phase 1-4 CO 2 Flood Performance Salt Creek Phases 1-4 CO2 Flood Performance 9,000 8,000 Oil Production CO2 Injection Gross Oil Production (BOPD) 7,000 6,000 5,000 4,000 3, Total CO2 Injection (MMCFD) 2, , Jan-04 Jul-04 Jan-05 Jul-05 Jan-06 Jul-06 Jan-07 Jul-07 Jan-08

32 Anadarko s Rockies EOR Current Activity Monell Unit 3,000 BOPD 50% Developed (based on area) Improved sweep via 9-spot pilot Five years of continuous injection without major breakthrough Salt Creek 7,000 BOPD 20% Developed (based on area) Unique CO2 flood pushing technological envelope Phase development allows flexibility to apply lessons learned Future Development 1) Significant undeveloped resources at Monell and Salt Creek 2) Linch Fields ~ 15 miles north of Salt Creek 3) Apply lessons learned to future developments

33 Discussion?

Experiences in the Salt Creek Field CO2 Flood

Experiences in the Salt Creek Field CO2 Flood Ken Hendricks Anadarko Petroleum Corp. 5 th Annual Wellbore Integrity Network May 13-14, 2009 Calgary, Alberta Thank you This presentation contains forward-looking