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* Marque de commerce de Petro-Canada - Trademark

Extended-Reach Slant Drilling ApplicationMacKay River SAGD Project

Extended-Reach Slant Drilling ApplicationMacKay River SAGD Project

Dwight Teotico & Amy van Thiel

June 3, 2008

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2006 Petro-CanadaMarch 24, 2006 MRX Well Design 2

Introduction - ObjectivesIntroduction - Objectives

Oil Sands in Alberta

MacKay Area Overview

Objectives for MRX

MRX Extended Reach Planning

Execution & Accomplishments

Going Forward

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Oil Sands in AlbertaOil Sands in Alberta

Athabasca Oil Sands

Spans 40 000 square km

Over one trillion barrels of

OBIP 10% accessible through

economical surface miningmethods

Thermal in-situ method Injection of steam to reduce

viscosity of oil

Well pairs drilled horizontal,

parallel and vertically aligned First field tested at AOSTRAs

Underground Test Facility

Environmental surface

impacts are minimized

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MacKay Area OverviewMacKay Area Overview

Located 60 km northwest ofFort McMurray

Petro-Canadas firstcommercial SAGD project.

Estimated lifespan of 25 to30 years

Fort McMurray

Oil SandsOil Sands

RegionsRegions

Mining Area

ALBERTA

Calgary

Edmonton

CROWN

MacKayRiver

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MacKay Area Overview (Cont.)MacKay Area Overview (Cont.)

Executed Drilling Programs

Pad 20/21 25 well pairs (Sept. 2001)

Pad 22/23 21 well pairs (Jul. 2005)

Pad 40 2 well pairs (Jan. 2005)

Pad 24/25 20 well pairs (Apr. 2008)

Current Drilling Program H Pattern 4 well pairs to be completed June 2008

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Objectives of MRXObjectives of MRX

Design the optimum well pairs

Ensure bitumen supply of 40 000 bbl/day at central facility

Design injector and producer to minimize liquid level build-up

Optimize SOR by even steam chamber development

Conventional or Larger Extended Reach Well Bores

Reduction of logistics costsReduction of drilling costs

Reduction of facilities costs

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Extended Reach Cost SAVINGSExtended Reach Cost SAVINGS

Original plan -> 4 pads to drain 8 patterns (54 pairs)

Revised plan -> 2 pads to drain 5 patterns (42 pairs)

Reduction in pads equated to a savings for several areas

Drilling

Facilities Logistics

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Rig UtilizationRig Utilization

Horizon 301

650 m Surface Rig

Vertical or 45 degree slant

drilling capability Utilized due to scheduling

constraints

Precision Drilling 295SL

2200 m Super SingleTM

45 degree slant drilling

capability Designed for specialty drilling

such as SAGD

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GeologyGeology

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Geological ChallengesGeological Challenges

Formations

SURFACE - Unconsolidated sand, boulders, and gravel seams

INT. - High clay content

MAIN - Unconsolidated saturated highly porous bitumen pay Limited True Vertical Depth

Surface Casing (Kick of Point) ~ 60 mTVD

ICP of ~ 135 mTVD

Slant drilling with aggressive build rates Extreme pull downs

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Well Design ChallengesWell Design Challenges

Large diameter hole/casing sizes for surface and intermediatestrings

BHA Design Unconventional Torque and Drag Issues

Torque limitations for installation of slotted liner

Directional profile constraints

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MRX Planning and PreparationMRX Planning and Preparation

Encapsulating Drilling FluidSystem

Eliminate accretion issues

Reduces abrasiveness Allows for mechanical solids

separation

Provides lubricity

Hole Cleaning Capability

Maintain minimum annularvelocity

Moderation of drilling rate tomatch hole cleaning capability

Mechanical cleaning methods

Premium fluid handling and

solids control equipment

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MRX Planning and PreparationMRX Planning and Preparation

Mud Cooling System

Increased well bore stability

Decreased torque and drag

Reduction in cuttings volume

MGT Conveyance

SAGD producers were rangedto the existing OB wells

SAGD injectors were rangedto the producers

TractorCoiled Tubing

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MRX Directional PlanningMRX Directional Planning

Challenges Maintaining angle in sand on

surface hole Drilling at base of producing zone

without entering non-producing

Limestone formation Ranging constraints

Directional Planning &Execution

Maximum planned dogleg of 8s onbuild sections

Close directional control to reduceDLS and tortuosity

Extended reach drillingtechnologies investigated Rotary Steerable AG-itator Slider

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711mm Hole Opener711mm Hole Opener

Used to ream open 311mm pilot hole to 711mm ~ 7000 lbs

Top Section Bottom Section

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Liner Running Installation LimitsLiner Running Installation Limits

Torque limitations under combined loading of tension/ compression

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SAGD Extended Reach Well DesignSAGD Extended Reach Well Design

7" WELL DESIGN

PRODUCER INJECTOR

Spud @ 45deg inclinationG.ELEV (m):

(see survey)

KB. ELEV (m) :

(see directional plan)

Class I BOP (Diverter)

PETRO-CANADA MR1 SAGD

Surface Casing 13 3/8" (339.7mm) Surface Casing

177.8 x 244.5mm

Debris Seal Packer

9 5/8" (244.5mm) Interm. Casing,

2 Blank Joints

Overla

7" (177.8mm) Inj./Prod Slotted Liner

INJECTOR

PRODUCER

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AccomplishmentsAccomplishments

PC NNP1 1533mMD, 131mTVD, 1480m V.S.

11.3:1 V.S to TVD ratio

A li h NNP1

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Accomplishments NNP1Accomplishments NNP1

G i F dG i F d

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Going ForwardGoing Forward

Continued Well Design

Casing/Tubing Configurations

Slotting Design

Cement Integrity

Drilling Challenges

Equipment Limitations

Rig Modifications

Q tiQ ti

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QuestionsQuestions