Effect of Conductive and Convective Heat Flow on Gas Production from Natural Hydrates by Depressurization

Pooladi‐Darvish, Mehran; Hong, Huifang

doi:10.1007/0-306-48645-8_4

Cited by 24 publications

(23 citation statements)

References 13 publications

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“…Heat transfer, as one of the three main mechanisms of hydrate production, has an increasingly significant influence on hydrate safety and efficient exploitation [9]. One of the key requirements of any production technique is to provide the heat necessary for the endothermic reaction of hydrate decomposition, which is determined by heat transfer [10], so the heat transfer analysis of hydrate-bearing sediments is a controlling factor for all production techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The results proved that energy efficiency ratio is independent of time, and depends only on the parameters of the system and the boundary and initial conditions. Pooladi-Darvish et al [10] presented a system model to study the effects of conductive and convection heat flow on gas production from natural hydrates by depressurization. The results depicted that thermal conductivity of sediments has a significant effect on the heat transfer of hydrate decomposition and a raise of the convection of hydrate sediment may lead to the decrease of heat capacity of the whole hydrate sediment which would slow down the production rate.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, relatively little attention has been given to the problem because of the inherent complexity encountered when dealing with porous media coupled with phase transformation and motion of the interface [10,23]. Due to the limited amount of experimental work on heat transfer during hydrate dissociation in porous media, the various effects are not fully understood and a number of critical issues remain unresolved.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Analysis of Methane Hydrate Sediment Dissociation in a Closed Reactor by a Thermal Method

et al. 2012

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Abstract:The heat transfer analysis of hydrate-bearing sediment involved phase changes is one of the key requirements of gas hydrate exploitation techniques. In this paper, experiments were conducted to examine the heat transfer performance during hydrate formation and dissociation by a thermal method using a 5L volume reactor. This study simulated porous media by using glass beads of uniform size. Sixteen platinum resistance thermometers were placed in different position in the reactor to monitor the temperature differences of the hydrate in porous media. The influence of production temperature on the production time was also investigated. Experimental results show that there is a delay when hydrate decomposed in the radial direction and there are three stages in the dissociation period which is influenced by the rate of hydrate dissociation and the heat flow of the reactor. A significant temperature difference along the radial direction of the reactor was obtained when the hydrate dissociates and this phenomenon could be enhanced by raising the production temperature. In addition, hydrate dissociates homogeneously and the temperature difference is much smaller than the other conditions when the production temperature is around the 10 °C. With the increase of the production temperature, the maximum of ΔT oi grows until the temperature reaches 40 °C. The period of ΔT oi have a close relation with the total time of hydrate dissociation. Especially, the period of ΔT oi with production temperature of 10 °C is twice as much as that at other temperatures. Under OPEN ACCESSEnergies 2012, 5 1293 these experimental conditions, the heat is mainly transferred by conduction from the dissociated zone to the dissociating zone and the production temperature has little effect on the convection of the water in the porous media.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Analysis of Methane Hydrate Sediment Dissociation in a Closed Reactor by a Thermal Method

et al. 2012

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“…Development of a model that incorporates the important mechanisms of fluid and heat flow and hydrate dissociation but is simple enough that allows development of analytical solutions has been achieved for the case of hydrate-capped gas reservoir (Gerami and Pooladi-Darvish, 2009). The selection of the simplifying assumptions that allow an analytical solution while capturing the important mechanisms was based on a large number of sensitivity studies to understand the dominant mechanisms Pooladi-Darvish, 2005, Pooladi-Darvish andHong, 2004). We suspect that development of similar solutions for more prevalent GH accumulations, i.e.…”

Section: Well Testing and Interpretation Issuesmentioning

confidence: 99%

Challenges, Uncertainties, and Issues Facing Gas Production From Gas-Hydrate Deposits

Moridis

Collett

Pooladi‐Darvish

et al. 2011

SPE Reservoir Evaluation &Amp; Engineering

281

110

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Summary The current paper complements the Moridis et al. (2009) review of the status of the effort toward commercial gas production from hydrates. We aim to describe the concept of the gas-hydrate (GH) petroleum system; to discuss advances, requirements, and suggested practices in GH prospecting and GH deposit characterization; and to review the associated technical, economic, and environmental challenges and uncertainties, which include the following: accurate assessment of producible fractions of the GH resource; development of methods for identifying suitable production targets; sampling of hydrate-bearing sediments (HBS) and sample analysis; analysis and interpretation of geophysical surveys of GH reservoirs; well-testing methods; interpretation of well-testing results; geomechanical and reservoir/well stability concerns; well design, operation, and installation; field operations and extending production beyond sand-dominated GH reservoirs; monitoring production and geomechanical stability; laboratory investigations; fundamental knowledge of hydrate behavior; the economics of commercial gas production from hydrates; and associated environmental concerns.

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“…Similarly, heat transfer from within the reservoir and from the over-and under-burden layers significantly influence the hydrate decomposition rate and the percentage of gas production [30,31]. Generally, the heat transfer capacity was controlled by the effective thermal conductivity of the surrounding sediments, which has been widely confirmed [32,33]. The mechanical property of hydrate-bearing sediments is a critical element for evaluating the stability of the hydrate-bearing sediments during gas production process.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Physical Properties of Hydrate Sediments Recovered from the Pearl River Mouth Basin in the South China Sea: Preliminary Investigation for Gas Hydrate Exploitation

et al. 2017

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Laboratory based research on the physical properties of gas hydrate hosting sediment matrix was carried out on the non-pressurized hydrate-bearing sediment samples from the Chinese Guangzhou Marine Geological Survey 2 (GMGS2) drilling expedition in the Pearl River Mouth (PRM) basin. Measurements of index properties, surface characteristics, and thermal and mechanical properties were performed on ten sediment cores. The grains were very fine with a mean grain size ranging from 7 to 11 µm throughout all intervals, which provide guidance for the option of a screen system. Based on X-ray Computed Tomography (CT) and SEM images, bioclasts, which could promote hydrate formation, were not found in the PRM basin. However, the flaky clay might be conducive to hydrate formation in pore spaces. The measured sediment thermal conductivities are relatively low compared to those measured at other mines, ranging from 1.3 to 1.45 W/(m·K). This suggests that thermal stimulation may not be a good option for gas production from hydrate-bearing sediments in the PRM basin, and depressurization could exacerbate the problems of gas hydrate reformation and/or ice generation. Therefore, the heat transfer problem needs to be considered when exploiting the natural gas hydrate resource within these areas. In addition, the results of testing the mechanical property indicate the stability of hydrate-bearing sediments decreases with hydrate dissociation, suggesting that a holistic approach should be considered when establishing a drilling platform. Both the heat-transfer characteristic and mechanical property provide the foundation for the establishment of a safe and efficient production technology for utilizing the hydrate resource.

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Effect of Conductive and Convective Heat Flow on Gas Production from Natural Hydrates by Depressurization

Cited by 24 publications

References 13 publications

Heat Transfer Analysis of Methane Hydrate Sediment Dissociation in a Closed Reactor by a Thermal Method

Heat Transfer Analysis of Methane Hydrate Sediment Dissociation in a Closed Reactor by a Thermal Method

Challenges, Uncertainties, and Issues Facing Gas Production From Gas-Hydrate Deposits

Analysis of the Physical Properties of Hydrate Sediments Recovered from the Pearl River Mouth Basin in the South China Sea: Preliminary Investigation for Gas Hydrate Exploitation

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