Natural Gas Hydrates

Boswell, Ray; Hancock, Steve H.; Yamamoto, Koji; Collett, Timothy S.; Pratap, M.; Lee, Sung-Rock

doi:10.1016/b978-0-08-102886-5.00006-2

Cited by 65 publications

(40 citation statements)

References 46 publications

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“…Naturally occurring gas hydrates, which are crystalline solids composed of water and natural gas, are a potential new energy resource. − Being a crystalline solid is an important physical feature in identifying the occurrence of gas hydrate from geophysical and petrophysical data. The crystalline nature of gas hydrate, however, poses inherent difficulties in developing hydrate reservoirs, unlike conventional hydrocarbons, which mostly consists of mobile fluids.…”

Section: Introductionmentioning

confidence: 99%

Geological Reservoir Characterization of a Gas Hydrate Prospect Associated with the Hydrate-01 Stratigraphic Test Well, Alaska North Slope

et al. 2022

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Geological reservoir characterization is essential for accurate evaluation of gas production performance from gas hydrate reservoirs. Particularly, the understanding of reservoir architecture and heterogeneity is of great importance since these are considered as major controls on fluid hydrodynamic and thermodynamic conditions. This study deals with well log and three-dimensional (3-D) vertical seismic profile (VSP) data acquired from the Hydrate-01 Stratigraphic Test Well within the 7-11-12 prospect, Prudhoe Bay Unit, Alaska North Slope and reports on the results of geological/geophysical evaluation related to the geological structure and reservoir properties of the 7-11-12 prospect. The structural trends of the target reservoirs, based on well correlations, are mostly consistent with the predrill prediction using the surface seismic data, and infer the existence of subseismic faults cutting through the Hydrate-01 well. The 3-D VSP data confirm a down-to-the-east normal fault that offsets the reservoir units across the Hydrate-01 well, which is concordant with the well identification of the same fault, and indicate a northeast-dipping relay structure associated with the overstepping normal faults. The edge enhancement attribute associated with discontinuity generated from the 3-D VSP data shows small faults/fractures, possibly as part of a complex fault network within the imaged normal fault system. These results reveal that the 3-D VSP data provide detailed structural information that is not present from the surface seismic data. The Hydrate-01 well log data confirm the occurrence of gas hydrate at high saturation in the two targeted sand units (B1 and D1 sands), and the comparison to a nearby preexisting well (7-11-12 well) shows the same general trend in gas hydrate saturation as a map of seismic impedance generated from surface seismic data. The well log data also suggest that the base of gas hydrate occurrence in the Hydrate-01 and 7-11-12 wells is almost aligned at the same depth in both of the targeted B1 and D1 sand reservoirs. Especially for the D1 sand in the Hydrate-01 well, the resistivity logs show a sharp transition from high gas hydrate saturation to fully water-saturated within the D1 sand, suggesting a common gas hydrate/water contact. The results of this study will be used to construct the geological models needed for reservoir simulation studies and they can provide important insights into the geological factors that control the occurrence of gas hydrate on the Alaska North Slope.

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Section: Introductionmentioning

confidence: 99%

Geological Reservoir Characterization of a Gas Hydrate Prospect Associated with the Hydrate-01 Stratigraphic Test Well, Alaska North Slope

et al. 2022

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“…The factorial use of gas hydrates (GH) can be used as a substantial source of energy for people. In many countries, gas hydrates are considered the most likely alternative fuel [1][2][3]. Global estimates of the gas content in hydrate structures are within the range of ≈(1-5) × 10 15 (m 3 ) [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Intensification of Gas Hydrate Formation Processes by Renewal of Interfacial Area between Phases

Pavlenko

Koshlak

2021

Energies

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This paper presents the analysis of the main reasons for a significant decrease in the intensity of diffusion processes during the formation of gas hydrates; solutions to this problem are proposed in a new process flow diagram for the continuous synthesis of gas hydrates. The physical processes, occurring at the corresponding stages of the process flow, have been described in detail. In the proposed device, gas hydrate is formed at the boundary of gas bubbles immersed in cooled water. The dynamic effects arising at the bubble boundary contribute to the destruction of a forming gas hydrate structure, making it possible to renew the contact surface and ensure efficient heat removal from the reaction zone. The article proposes an assessment technique for the main process parameters in the synthesis of hydrates based on the criterion of thermodynamic parameters optimization. The optimization criterion determines the relationship of intensity of heat and mass transfer processes at the phase contact interface of reacting phases, correlating with the maximum GH synthesis rate, and makes it possible to determine optimum thermodynamic parameters in the reactor zone.

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“…7 Methane hydrate-bearing sands or silts are generally potential reservoirs for feasible and safe gas production in the world. 8 As seen in Figure 1, gas hydrates are widely observed all around the world. The number of gas hydrate field-scale production trials has increased since especially 2002.…”

Section: Introductionmentioning

confidence: 99%

“…Even at pessimistic estimations, the amount of technically recoverable CH 4 from CH 4 hydrates is in the range of 300 tcm . Methane hydrate-bearing sands or silts are generally potential reservoirs for feasible and safe gas production in the world …”

Section: Introductionmentioning

confidence: 99%

Gas Production from Methane Hydrate Reservoirs in Different Well Configurations: A Case Study in the Conditions of the Black Sea

Ubeyd

Merey

2020

Energy Fuels

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Gas hydrates are considered “near-future energy resources” due to their vast existence all around the world. Recently, China has tested gas production from methane hydrate-bearing clayey silts via horizontal well technology for the first time. This study aims to investigate the effect of well configuration on gas production from the Black Sea gas hydrates. Mainly, two different hydrate-bearing models (single-layer homogeneous hydrate-bearing sands and multilayer hydrate-bearing turbidite) were constructed in this study. Gas production numerical simulations were held using the TOUGH + HYDRATE simulator. Gas production via the horizontal well in single-layer homogeneous hydrate-bearing sand was higher compared to the vertical well case at early stages. However, fast depressurization via the horizontal well caused a rapid decline in reservoir temperature and hydrate dissociation rate. Then, local hydrate reformation was detected near the wellbore. In the later periods of gas production, higher gas production with the vertical well was obtained. The clay layers in the heterogeneous methane hydrate reservoirs (alternating sand and clay layers in turbidite) behave like a barrier to depressurization with a horizontal well.

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Natural Gas Hydrates

Cited by 65 publications

References 46 publications

Geological Reservoir Characterization of a Gas Hydrate Prospect Associated with the Hydrate-01 Stratigraphic Test Well, Alaska North Slope

Geological Reservoir Characterization of a Gas Hydrate Prospect Associated with the Hydrate-01 Stratigraphic Test Well, Alaska North Slope

Intensification of Gas Hydrate Formation Processes by Renewal of Interfacial Area between Phases

Gas Production from Methane Hydrate Reservoirs in Different Well Configurations: A Case Study in the Conditions of the Black Sea

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