A Perspective on Experience on U.S- Norwegian Co-operation on EOR at COREC Centre at Rogaland and University of Bergen David R. Zornes Manager – Reservoir Mechanisms Group Bartlesville Technology Center

Outline of Presentation History of COP and Norway Primary Areas of Research – Technical Needs and Issues are Primary Drivers Why Cooperation is Our Practice

Ekofisk Research Timeline Preliminary EOR Lab Tests Initiate Waterflood in Tor Fm. Based on Initial Characterization. Expand Waterflood with Updated Lab & Modeling Results. Subsidence Observed. Start Rock Mechanics Testing & Modeling Ekofisk II EOR Screening.

Key Research Directions Improved Recovery Methods. –Mechanisms and Endpoints. –CO2, HC WAG, MIOR, Imbibition Enh., Air Subsidence and Compaction. –Recognition and Forecasting. –Field Monitoring & Fully Coupled Modeling CO 2 Sequestration – CH 4 Production from Hydrates.

Improved Waterflood Performance Initial Studies Suggested Waterflood Would NOT Be Very Successful. After Successful Pilot – Lab and Theoretical Studies Focused on Mechanisms and Endpoints. Recovery Factor Improvements.

MRI Imaging of Fluids Crossing Fracture in Chalk Mechanism for Crossing Strongly Dependent Upon Chalk Wettability. How and When Crosses Fracture to Next Block is Critical Information in Simulation Model. AB Water WetLess Water Wet

EOR Evaluation Studies Laboratory & Reservoir Simulation 1998 Study for NPD –HC WAG 6% Recovery Inc. Most Feasible in Current Environment. –N2 WAG Not Economical. –CO2 WAG 6% Recovery Inc. Requires CO2 Source. Current COREC Project. –Air Injection Good Recovery – Last Stage. EU Thermie Project Involving Rogaland, Bath and Contractors. –MEOR Low Recovery but Inexpensive.

Subsidence of Ekofisk Field Recognized in Engineering Response – Jack Up Platforms. Research – Fundamentals of Chalk Compressibility Subsidence Modeling/Forecasts

Chalk Rock Mechanics Laboratory Stress / Strain Tests Determine Extent of Potential Compaction. Incorporated into Subsidence Model. BTC – HiS Laboratory Collaboration. 30% 44% 7x Str ain

Subsidence Modeling North Sea Ultimate Subsidence

CO2 Sequestration – Hydrate Production Research University of Bergen – ConocoPhillips Collaborative Laboratory and Theoretical Study. State-of-Art Research Draws on Expertise from Each Group. –Form and Produce Gas Hydrates in Lab. –MRI Monitor Reaction Rates and Paths. CH4 Gas Water- Saturated Core Hydrate

Collaboration and Training with Norwegian Universities Students Worked on Ekofisk-Related Projects at BTC Since 1980’s – Numerous MS/Dipl. Degrees, 8 Ph.D.’s (Including Several Current Faculty). –NTNU – Dept. of Petroleum Engineering. –University of Bergen – Dept. Physics. –Høgskolen i Stavanger – Dept. Petrol. Eng.

Industry-Supported Research Joint Chalk Research. (1970’s – Current). Broad-Based Programs with Emphasis on Industry-University Collaboration. Phillips/CoP as Major Participant in All Stages. University Research Centres –CIPR (University of Bergen) –COREC (University College Stavanger) Ekofisk Area PL018 Co-Venturers Sponsored Internal Research.

Lessons from Ekofisk-Related Research on Improved Recovery Well-Defined Goals: Problems Linked to Fundamental Questions. Long-Term: Allowed for False Starts, Change in Direction. Multi-Disciplinary: Left “Business as Usual” Behind, Overcame Tradition and Bias.

Advantages of Cooperation Develop Additional Expertise Multi-Discipline Approach Longer Term Possible on Fundamentals Potential for Lower Costs With Students Leverage Our Internal Resources Network of Researchers/Relationships Norwegian Institutes Increasingly Involved

Acknowledgements ConocoPhillips Management Reservoir Recovery Mechanisms Staff– Past and Present U. of Bergen, Rogaland University Numerous COP Employees

The End Questions???