08-09-04

A report at the international Greenhouse Gas Control Technologies Conference in Vancouver concludes that geological conditions in the Weyburn oil field in western Canada are favourable for long-term storage of carbon dioxide (CO2).

The four-year, multidisciplinary study was conducted by the Petroleum Technology Research Centre (PTRC) in Regina under the auspices of the International Energy Agency Greenhouse Gas (IEA GHG) Research and Development Programme.

The PTRC worked on the study in close collaboration with EnCana of Calgary, Alberta, which operates the 50-year-old Weyburn field in south-eastern Saskatchewan.

"The Weyburn project was the first large-scale study ever conducted in the world of the geological storage of CO2 in a partially depleted oil field," explained Mike Monea, Executive Director of the PTRC. "While there are numerous large commercial CO2-enhanced oil-recovery operations globally, there are none that have undertaken the depth and extent of research that we have."

Natural Resources Canada (NRCan) is one of the 15 public- and private-sector institutions that funded the study.

"I am pleased with the results of this project, and with the enormous potential for reducing greenhouse gas emissions from fossil fuels through capturing and storing CO2," said the Honourable R. John Efford, Minister of Natural Resources Canada. "The leading-edge technology demonstrated here is key to the Government of Canada's approach to addressing climate change."

Other institutions which funded the C$ 40 mm project include the United States Department of Energy, Saskatchewan Industry and Resources, Alberta Energy Research Institute and the European community. Industry participants include EnCana, BP, ChevronTexaco, Dakota Gasification Company, ENAA (Japan), Nexen, SaskPower, TransAlta and Total (France). Altogether, the project involved 24 research and consulting organizations in Canada, Europe and the United States.

During the study, researchers conducted a long-term risk assessment, completed geological and seismic studies, matched reservoir modelling against actual results, and performed repeated and frequent sampling to understand chemical reactions occurring in the reservoir.

"The Weyburn project is a prime example of innovative research in Saskatchewan that has global application," Saskatchewan Industry and Resources Minister Eric Cline said. "The work that has been done in Weyburn has enormous benefits for our growing oil industry and also represents a key contribution by our province to solving the challenges of climate change."

The IEA GHG Weyburn project's most involved industry participant was EnCana Corporation of Calgary.
"We are encouraged by the results," said Gerry Protti, EnCana's Executive Vice-President of Corporate Relations. "At Weyburn, we are demonstrating every day that oil production can be enhanced in an environmentally responsible manner. We are pleased to have been part of this collaborative, international project involving industry, governments and researchers."

The Weyburn oil field has stored an estimated 5 mm tons of CO2 over the IEA GHG project life -- equivalent to taking about 1 mm cars off the road for one year. The CO2 is supplied through a 325 km pipeline from Dakota Gasification Company's coal-gasification plant at Beulah, North Dakota.

"The IEA GHG Weyburn project is good news for addressing climate change because it proves that you can safely store 5,000 tons of CO2 per day in the ground rather than venting the greenhouse gas into the atmosphere," explained Malcolm Wilson, International Energy Specialist with the PTRC and one of the founders of the project.

The Weyburn field was selected for the study because detailed geological records and core samples, as well as almost 50 years of production history, were readily available. Some 380 mm barrels of oil have been produced from the field since it was discovered in 1954.

The IEA GHG Weyburn study was able to:
-- utilize seismic surveys to "see" the CO2 flow within the geological formations and mix with the oil reserves;
-- develop a model to predict the storage capacity of the reservoir and match results over time with the model;
-- predict in a risk-assessment model that most of the CO2 will remain in the reservoir in which it is injected, with a small amount sinking to even lower levels underground over the 5,000 years following the end of the project; and
-- conclude that the CO2 would never reach or penetrate overlying potable water zones or the atmosphere above ground level.

"Although we're very excited with these conclusions, we believe there's much more work to be done to determine how our techniques and systems can be applied from the Weyburn geological formation to other formations around the world, to make CO2 storage a real option for reducing our greenhouse gas emissions worldwide," Wilson said.

The Greenhouse Gas Control Technologies Conference, where the report was released, is the first international gathering of its kind ever held in Canada, drawing expert academics, scientists and policy-makers from around the world. The previous conference was held in Kyoto, Japan, in 2002.

The Government of Canada's approach to climate change is focused on making the right choices for Canada. This will ensure that the actions taken contribute to the long-term goals of building a sustainable economy for the 21st century, a healthier environment and strong communities, while affirming Canada's place in the world.

The Government of Canada contributed $ 6 mm to this study. Funding for the initiative was provided for in the existing fiscal framework. The Government of Saskatchewan contributed approximately $ 2.2 mm to the project through the Saskatchewan Petroleum Research Incentive.

Source: ScienceDaily