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Determination of CO2 Capillary Entry Pressure in Cap-rock Shale
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Core samples from preserved cap-rock material have been use to determine CO2 capillary entry pressure of cap-rock cores. The cores have been mounted in a core holder equipped with a confining rubber sleeve which allows applying overburden pressure (net confining pressure). The permeability has been determined by forcing brine through the cap-rock shale extremely low water injection rate over extended time of injection at an ultra-low flow rate at high confining pressure and corresponding high water injection pressure.
The core material applied was a grey to brown silty mudstone extracted from preserved cap-rock shale material from earlier studies at SINTEF which was made available for this work. The drilled shale core was mounted in core holder. A new apparatus has been assembled for determination of capillary entry pressure in sealing rock samples or low permeable flow barriers in CO2 storage sites. The components of the apparatus are a high pressure core holder, flow line pressure and differential pressure transducers, back-pressure valve, CO2 and brine vessels with floating pistons above hydraulic oil and sleeve pressure tank are all placed inside a heating cabinet. The continuous injection method was applied to determine the CO2 capillary entry pressure. Successful results were obtained.