Measurements of non-wetting phase trapping applied to carbon dioxide storage |
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| Authors: | Saleh K Al Mansoori Endurance Itsekiri Stefan Iglauer Christopher H Pentland Branko Bijeljic Martin J Blunt |
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| Institution: | 1. School of Petroleum Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao 266580, China;2. School of Geosciences, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao 266580, China;1. School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA;2. Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;3. School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA;1. School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA;2. Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia;1. School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, USA;2. Utah State University, Department of Geology, Logan, UT, USA;3. Earth and Environmental Sciences Division (EES), Los Alamos National Laboratory, Los Alamos, NM, USA;1. School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, United States;2. School of Petroleum Engineering, University of New South Wales, Sydney 2052, NSW, Australia;3. Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland;4. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR, United States;1. Petricore Norway AS, Trondheim, Norway;2. Australian National University, Canberra, Australia |
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| Abstract: | We measure the trapped non-wetting phase saturation as a function of the initial saturation in sand packs. The application of the work is for CO2 storage in aquifers where capillary trapping is a rapid and effective mechanism to render injected CO2 immobile. The CO2 is injected into the formation followed by chase brine injection, or natural groundwater flow, which displaces and traps CO2 on the pore scale as a residual immobile phase. Current models to predict the amount of trapping are based on experiments in consolidated media, while CO2 may be stored in relatively shallow, poorly consolidated systems. We use analogue fluids at ambient conditions. The trapped saturation initially rises linearly with initial saturation to a value of approximately 0.13 for oil/water systems and 0.14 for gas/water systems. There then follows a region where the residual saturation is constant with further increases in initial saturation. This behaviour is not predicted by the traditional literature trapping models, but is physically consistent with unconsolidated media where most of the larger pores can easily be invaded at relatively low saturation and there is, overall, relatively little trapping. A good match to our experimental data was achieved with the trapping model proposed by Aissaoui. |
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