Recoverable gas from hydrate-bearing sediments: Pore network model simulation and macroscale analyses

Jang, Jae‐Won; Santamarina, J. Carlos

doi:10.1029/2010jb007841

Cited by 51 publications

(36 citation statements)

References 58 publications

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“…This overall fluid expansion at 8 MPa equates to 1880 L of CH 4 at 0.1 MPa. A detailed description of the pressure dependent fluid expansion effect across the phase boundary of CH 4 hydrate was presented by Jang and Santamarina in 2011 [11]. During these 12 h of the production test 288 L of CH 4 were catalytically converted to CO 2 and H 2 O.…”

Section: Figure 8 (A)mentioning

confidence: 99%

A Counter-Current Heat-Exchange Reactor for the Thermal Stimulation of Hydrate-Bearing Sediments

et al. 2013

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Since huge amounts of CH 4 are bound in natural gas hydrates occurring at active and passive continental margins and in permafrost regions, the production of natural gas from hydrate-bearing sediments has become of more and more interest. Three different methods to destabilize hydrates and release the CH 4 gas are discussed in principle: thermal stimulation, depressurization and chemical stimulation. This study focusses on the thermal stimulation using a counter-current heat-exchange reactor for the in situ combustion of CH 4 . The principle of in situ combustion as a method for thermal stimulation of hydrate bearing sediments has been introduced and discussed earlier [1,2]. In this study we present the first results of several tests performed in a pilot plant scale using a counter-current heat-exchange reactor. The heat of the flameless, catalytic oxidation of CH 4 was used for the decomposition of hydrates in sand within a LArge Reservoir Simulator (LARS). Different catalysts were tested, varying from diverse elements of the platinum group to a universal metal catalyst. The results show differences regarding the conversion rate of CH 4 to CO 2 . The promising results of the latest reactor test, for which LARS was filled with sand and ca. 80% of the pore space was saturated with CH 4 hydrate, are also presented in this study. The data analysis showed that about 15% of the CH 4 gas released from hydrates would have to be used for the successful dissociation of all hydrates in the sediment using thermal stimulation via in situ combustion. OPEN ACCESSEnergies 2013, 6 3003

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Section: Figure 8 (A)mentioning

confidence: 99%

A Counter-Current Heat-Exchange Reactor for the Thermal Stimulation of Hydrate-Bearing Sediments

et al. 2013

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“…(For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) core 8P) (Jang and Santamarina, 2011); (2) the residual water saturation S rw in this specimen is assumed to be the water content measured after complete depressurization of the specimen, which is 0.16; (3) the pressure dependent volume change of methane gas follows a modified PengeRobinson equation of state (Stryjek and Vera, 1986). Pressure and volume are inversely related, meaning the higher the pressure, the smaller the gas volume and higher the water saturation; and (4) the loss of gas within the sediments during the permeability measurement is neglected.…”

Section: Water Permeabilitymentioning

confidence: 99%

Hydro-bio-geomechanical properties of hydrate-bearing sediments from Nankai Trough

Santamarina

Dai

Terzariol

et al. 2015

Marine and Petroleum Geology

209

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a b s t r a c tNatural hydrate-bearing sediments from the Nankai Trough, offshore Japan, were studied using the Pressure Core Characterization Tools (PCCTs) to obtain geomechanical, hydrological, electrical, and biological properties under in situ pressure, temperature, and restored effective stress conditions. Measurement results, combined with index-property data and analytical physics-based models, provide unique insight into hydrate-bearing sediments in situ. Tested cores contain some silty-sands, but are predominantly sandy-and clayey-silts. Hydrate saturations S h range from 0.15 to 0.74, with significant concentrations in the silty-sands. Wave velocity and flexible-wall permeameter measurements on neverdepressurized pressure-core sediments suggest hydrates in the coarser-grained zones, the silty-sands where S h exceeds 0.4, contribute to soil-skeletal stability and are load-bearing. In the sandy-and clayey-silts, where S h < 0.4, the state of effective stress and stress history are significant factors determining sediment stiffness. Controlled depressurization tests show that hydrate dissociation occurs too quickly to maintain thermodynamic equilibrium, and pressureetemperature conditions track the hydrate stability boundary in pure-water, rather than that in seawater, in spite of both the in situ pore water and the water used to maintain specimen pore pressure prior to dissociation being saline. Hydrate dissociation accompanied with fines migration caused up to 2.4% vertical strain contraction. The firstever direct shear measurements on never-depressurized pressure-core specimens show hydratebearing sediments have higher sediment strength and peak friction angle than post-dissociation sediments, but the residual friction angle remains the same in both cases. Permeability measurements made before and after hydrate dissociation demonstrate that water permeability increases after dissociation, but the gain is limited by the transition from hydrate saturation before dissociation to gas saturation after dissociation. In a proof-of-concept study, sediment microbial communities were successfully extracted and stored under high-pressure, anoxic conditions. Depressurized samples of these extractions were incubated in air, where microbes exhibited temperature-dependent growth rates.Published by Elsevier Ltd.

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“…Because a number of oceanic gas hydrate deposits are classified as low-permeability fine-grained sediments, e.g., Ulleung basin sediments as reported in Kwon et al [16], hydrate deposits in the Gulf of Mexico as reported in Francisca et al [17], and Krishna-Godavari basin in India as reported in Yun et al [18], the generation of excess pore pressure due to hydrate dissociation is known to be the most relevant process responsible for destabilizing hydrate-bearing sediments [10][11][12][13][14][15]. For example, a 1 °C increase in the temperature of hydrate-bearing sediments results in the pore fluid pressure increasing by the order of several megapascals under the no mass flux condition [15,19,20]. Therefore, any thermal change can stimulate hydrate dissociation and thus mechanically destabilize sediments [21][22][23][24].…”

Section: Gas Hydrate Dissociation As a Trigger Or Primer For Slope Famentioning

confidence: 94%

“…It is presumed that water is the dominant phase that flows over gas because the scope of the present study is confined to low hydrate saturation and fine-grained sediments. When the hydrate saturation is greater than 40%, and consequently, the free gas released by hydrate dissociation percolates through pore throats, multiphase flow analyses are required [19,20].…”

Section: Hydrate Dissociation By Pressure Diffusionmentioning

confidence: 99%

Submarine Slope Failure Primed and Triggered by Bottom Water Warming in Oceanic Hydrate-Bearing Deposits

Kwon

Cho

2012

Energies

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Many submarine slope failures in hydrate-bearing sedimentary deposits might be directly triggered, or at least primed, by gas hydrate dissociation. It has been reported that during the past 55 years ) the 0-2000 m layer of oceans worldwide has been warmed by 0.09 °C because of global warming. This raises the following scientific concern: if warming of the bottom water of deep oceans continues, it would dissociate natural gas hydrates and could eventually trigger massive slope failures. The present study explored the submarine slope instability of oceanic gas hydrate-bearing deposits subjected to bottom water warming. One-dimensional coupled thermal-hydraulic-mechanical (T-H-M) finite difference analyses were performed to capture the underlying physical processes initiated by bottom water warming, which includes thermal conduction through sediments, thermal dissociation of gas hydrates, excess pore pressure generation, pressure diffusion, and hydrate dissociation against depressurization. The temperature rise at the seafloor due to bottom water warming is found to create an excess pore pressure that is sufficiently large to reduce the stability of a slope in some cases. Parametric study results suggest that a slope becomes more susceptible to failure with increases in thermal diffusivity and hydrate saturation and decreases in pressure diffusivity, gas saturation, and water depth. Bottom water warming can be further explored to gain a better understanding of the past methane hydrate destabilization events on Earth, assuming that more reliable geological data is available. OPEN ACCESSEnergies 2012, 5 2850

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Recoverable gas from hydrate-bearing sediments: Pore network model simulation and macroscale analyses

Cited by 51 publications

References 58 publications

A Counter-Current Heat-Exchange Reactor for the Thermal Stimulation of Hydrate-Bearing Sediments

A Counter-Current Heat-Exchange Reactor for the Thermal Stimulation of Hydrate-Bearing Sediments

Hydro-bio-geomechanical properties of hydrate-bearing sediments from Nankai Trough

Submarine Slope Failure Primed and Triggered by Bottom Water Warming in Oceanic Hydrate-Bearing Deposits

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