Browsing Bergen Open Research Archive by Author "Almenningen, Stian"
Now showing items 1-15 of 15
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Compressional wave phase velocity measurements during hydrate growth in partially and fully water saturated sandstone
Sæther, Mathias Myrtveit; Almenningen, Stian; Ersland, Geir; Lunde, Per (Journal article; Peer reviewed, 2022)The compressional wave phase velocity (cP) has been measured as a function of hydrate saturation (SH) during hydrate growth in Bentheim sandstone. The Fourier spectrum signal processing technique was used to specifically ... -
Demonstrating the potential of CO2 hydrate self-sealing in Svalbard, Arctic Norway
Almenningen, Stian; Hussain, Arif; Betlem, Peter; Roy, Srikumar; Senger, Kim; Ersland, Geir (Peer reviewed; Journal article, 2019-10)Here we report the potential self-sealing properties of CO2 hydrate for the Longyearbyen CO2 Lab’s shallow aquifer in Svalbard, Arctic Norway, through hydrate formation experiments. The experiments were conducted on a 9 cm ... -
Direct Visualization of CH4/CO2 Hydrate Phase Transitions in Sandstone Pores
Pandey, Jyoti Shanker; Strand, Ørjan; Von Solms, Nicolas; Ersland, Geir; Almenningen, Stian (Journal article; Peer reviewed, 2021)This paper reports the formation and dissociation pattern of hydrate crystals with varying compositions of CH4 and CO2 in porous media. Direct visualization was carried out using a high-pressure, water-wet, silicon wafer-based ... -
Effect of Mineral Composition on Transverse Relaxation Time Distributions and MR Imaging of Tight Rocks from Offshore Ireland
Almenningen, Stian; Srikumar, Roy; Hussain, Arif; Seland, John Georg; Ersland, Geir (Journal article; Peer reviewed, 2020)In this paper, we investigate the effect of magnetic field strength on the transverse relaxation time constant (T2) in six distinct core plugs from four different rock types (three sandstones, one basalt, one volcanic tuff ... -
Effects of methane hydrates on two-phase relative permeability in sandstone: Numerical simulation of laboratory experiments
Bello Palacios, German Alejandro; Fotland, Per; Almenningen, Stian; Ersland, Geir (Journal article; Peer reviewed, 2022)To identify the challenges and limitations in measuring and modelling gas relative permeability in hydrate bearing sandstone, we simulate a series of experiments. Experimental and numerical results are used to examine the ... -
Experimental and Numerical Analysis of the Effects of Clay Content on CH4 Hydrate Formation in Sand
Bello Palacios, German Alejandro; Almenningen, Stian; Fotland, Per; Ersland, Geir (Journal article; Peer reviewed, 2021)Natural gas hydrates exist in large quantities in nature and represent a potential source of energy, mostly in the form of methane gas. Knowledge about hydrate formation in clayey sand is of importance for understanding ... -
Experimental Investigation of Critical Parameters Controlling CH4− CO2 Exchange in Sedimentary CH4 Hydrates
Almenningen, Stian; Graue, Arne; Ersland, Geir (Journal article; Peer reviewed, 2021)Sequestration of CO2 in natural gas hydrate reservoirs may offer stable long-term deposition of a greenhouse gas while benefiting from CH4 gas production. In this paper, we review old and present new experimental studies ... -
An Experimental Study of Methane Hydrates in Sandstone Cores
Almenningen, Stian (Master thesis, 2015-05-31)Natural gas hydrates exist in large quantities around the world, located in the subsurface of permafrost and oceanic environments. Future energy harvest from production of methane gas encapsulated in natural gas hydrates ... -
Hydrate Plugging and Flow Remediation during CO2 Injection in Sediments
Gauteplass, Jarand; Almenningen, Stian; Barth, Tanja; Ersland, Geir (Journal article; Peer reviewed, 2020)Successful geological sequestration of carbon depends strongly on reservoir seal integrity and storage capacity, including CO2 injection efficiency. Formation of solid hydrates in the near-wellbore area during CO2 injection ... -
Magnetic Resonance Imaging of Methane Hydrate Formation and Dissociation in Sandstone with Dual Water Saturation
Almenningen, Stian; Fotland, Per; Ersland, Geir (Peer reviewed; Journal article, 2019-08-22)This paper reports formation and dissociation patterns of methane hydrate in sandstone. Magnetic resonance imaging spatially resolved hydrate growth patterns and liberation of water during dissociation. A stacked core ... -
Mapping Gas Hydrate Dynamics in Porous Media : Experimental Studies of Gas Hydrates as a Source of CH4 and Sink for CO2
Almenningen, Stian (Doctoral thesis, 2020-03-20)The world needs more energy and the energy has to be more sustainable with respect to carbon dioxide (CO2) emissions. This is the backdrop for studying the diverse applications of gas hydrates in nature. The ice-like ... -
Measurements of CH4 and CO2 relative permeability in hydrate-bearing sandstone
Almenningen, Stian; Gauteplass, Jarand; Hauge, Lars Petter; Barth, Tanja; Fernø, Martin; Ersland, Geir (Peer reviewed; Journal article, 2019)This paper reports measurements of relative permeability to methane (CH4) and carbon dioxide (CO2) in hydrate-bearing sandstone core samples. The CH4 (or CO2) permeability was measured at reservoir conditions for different ... -
Multiscale investigation of CO2 hydrate self-sealing potential for carbon geo-sequestration
Gauteplass, Jarand; Almenningen, Stian; Ersland, Geir; Barth, Tanja; Yang, Jinhai; Chapoy, Antonin (Peer reviewed; Journal article, 2020)Storage of liquid CO2 in shallow geological formations is a recently proposed concept that can facilitate increased storage capacity and improved mobility control. If stored below the gas hydrate stability zone (GHSZ), ... -
Quantification of CH4 Hydrate Film Growth Rates in Micromodel Pores
Almenningen, Stian; Lysyy, Maksim; Ersland, Geir (Journal article; Peer reviewed, 2021)In this paper, we report the growth pattern and the rate of CH4 hydrate in sandstone pores. A high-pressure, water-wet, transparent micromodel with pores resembling a sandstone rock was used to visualize CH4 hydrate formation ... -
Storing CO2 as solid hydrate in shallow aquifers: Electrical resistivity measurements in hydrate-bearing sandstone
Gauteplass, Jarand; Almenningen, Stian; Ersland, Geir (Journal article; Peer reviewed, 2020)A recent proposed carbon dioxide (CO2) storage scheme suggests solid CO2 hydrate formation at the base of the hydrate stability zone to facilitate safe, long-term storage of anthropogenic CO2. These high-density hydrate ...