Transport Mechanisms for CO 2 -CH 4 Exchange and Safe CO 2 Storage in Hydrate-Bearing Sandstone

Knut Arne Birkedal, Lars Petter Hauge, Arne Graue and Geir Ersland
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Knut Arne Birkedal: Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway
Lars Petter Hauge: Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway
Arne Graue: Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway
Geir Ersland: Department of Physics and Technology, University of Bergen, 5007 Bergen, Norway

Energies, 2015, vol. 8, issue 5, 1-23

Abstract: CO 2 injection in hydrate-bearing sediments induces methane (CH 4 ) production while benefitting from CO 2 storage, as demonstrated in both core and field scale studies. CH 4 hydrates have been formed repeatedly in partially water saturated Bentheim sandstones. Magnetic Resonance Imaging (MRI) and CH 4 consumption from pump logs have been used to verify final CH 4 hydrate saturation. Gas Chromatography (GC) in combination with a Mass Flow Meter was used to quantify CH 4 recovery during CO 2 injection. The overall aim has been to study the impact of CO 2 in fractured and non-fractured samples to determine the performance of CO 2 -induced CH 4 hydrate production. Previous efforts focused on diffusion-driven exchange from a fracture volume. This approach was limited by gas dilution, where free and produced CH 4 reduced the CO 2 concentration and subsequent driving force for both diffusion and exchange. This limitation was targeted by performing experiments where CO 2 was injected continuously into the spacer volume to maintain a high driving force. To evaluate the effect of diffusion length multi-fractured core samples were used, which demonstrated that length was not the dominating effect on core scale. An additional set of experiments is presented on non-fractured samples, where diffusion-limited transportation was assisted by continuous CO 2 injection and CH 4 displacement. Loss of permeability was addressed through binary gas (N 2 /CO 2 ) injection, which regained injectivity and sustained CO 2 -CH 4 exchange.

Keywords: CO 2 sequestration; CO 2 exchange; gas hydrate production; temperature effects; diffusion; exchange driving force (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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