WellDog, Virginia Tech and Carbon GeoCycle jointly verify CO2 geological storage

Jul 01 2018

First direct verification of geologic sequestration of CO2 opens door for carbon sequestration efforts to proceed with greater confidence

The verification, made using WellDog's proprietary Reservoir Raman System, reveals that carbon dioxide injected over the last two years successfully flowed into all of the targeted coal seams. The US$15.5MM sequestration project is located in Buchanan County, Virginia.  The project is funded by the US Department of Energy, Virginia Tech, and private industry.

The test involves injecting over 13,000 tons of carbon dioxide into stacked unmineable coal seams at depths of 900 to 2,000 feet with the goal of storing carbon dioxide while simultaneously enhancing natural gas recovery.

"Carbon sequestration in geologic formations is our best way to slow and reverse climate change," said John M. Pope, Ph.D., chief executive officer of WellDog. "But understanding how, where and for how long sequestration occurs in rocks thousands of feet below ground is difficult."

"In this project the carbon dioxide flowed into the wellbore, but until we took direct downhole measurements in each coal seam, significant uncertainty persisted regarding which coal seams the carbon dioxide had sequestered," explained Pope.  "We are pleased that WellDog's technical services and Carbon GeoCycle's sequestration expertise were able to help Virginia Tech's experts confirm that all of the coal seams took up carbon dioxide.  This result represents an important step for sequestration efforts worldwide."

"Results from the test are very promising," said Nino Ripepi, Ph.D., associate professor of mining and minerals engineering at Virginia Tech and a manager of the project. "We have shown that coal seams can safely store carbon dioxide while at the same time enhancing gas. This is one of the first steps toward commercialization of these technologies."

More information on the project scope is available at https://vtnews.vt.edu/articles/2011/07/072011-engineering-carbondioxideintostorage.html 

Research partners in the project included Virginia Center for Coal and Energy Research, Virginia Tech; Virginia Department of Mines, Minerals and Energy; DOE's National Energy Technology Laboratory; Marshall Miller & Associates; Southern States Energy Board; CONSOL Energy; Geological Survey of Alabama; Sandia Technologies; Det Norske Veritas; WellDog; and Carbon GeoCycle.

The verification methods used by the partners included WellDog's unique downhole geochemical Reservoir Raman System, in which a full spectrum chemical analyzer and other sensors are lowered into a wellbore and used to identify directly and unambiguously the types and amounts of liquids and gases it contains. By watching those liquids and gases flow over time and at various depths, the system enabled direct confirmation of carbon dioxide flows into and out of rock formations. 

More information
DOE article

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CCUS in Europe - CO2-DISSOLVED: combining CO2 geological storage with geothermal heat recovery .. Pathways to Net-Zero Emissions from EU Heavy Industry .. SINTEF - carbon capture is cheaper than ever UK Government should ‘green light’ carbon captur.....

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