Simulation of Subsea Gas Hydrate Exploitation

Janicki, Georg; Schlüter, Stefan; Hennig, Torsten; Deerberg, Görge

doi:10.1016/j.egypro.2014.10.352

Cited by 13 publications

(7 citation statements)

References 21 publications

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“…S g = 0 P r e p r i n t 28 S. Gupta et al An all-at-once Newton strategy for methane hydrate reservoir models 29…”

Section: Numerical Simulation and Resultsmentioning

confidence: 99%

“…A number of different numerical methods have been developed to handle the gaseousaqueous phase transitions in multi-phase multi-component porous media models, e.g., primary variable switching (PVS) schemes [47,8], method of negative saturations [41], method of persistent variables [40,26], and non-linear complementary constraints (NCP) approaches P r e p r i n t An all-at-once Newton strategy for methane hydrate reservoir models 3 [36,34,3,5]. In the most widely used gas hydrate reservoir simulators, e.g., TOUGH-Hydrate [38], HYRES-C [29,28], STOMP-HYD [45], HRS [39], etc., the gaseous-aqueous phase transitions are handled using the PVS schemes, where the choice of the primary variables is adapted locally to the phase state. However, due to the strong coupling and nonlinearities, the phase states in gas hydrate models tend to switch back and forth rapidly, and this often leads to spurious oscillation and a drastic reduction in time step size, in the extreme case, even to a breakdown of the numerical algorithm.…”

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confidence: 99%

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An All-At-Once Newton Strategy for Marine Methane Hydrate Reservoir Models

2020

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Marine gas hydrate systems are characterized by highly dynamic transport-reaction processes in an essentially water-saturated porous medium that are coupled to thermodynamic phase transitions between solid gas hydrates, free gas and dissolved methane in the aqueous phase. These phase transitions are highly nonlinear and strongly coupled, and cause the mathematical model to rapidly switch the phase states and pose serious convergence issues for the classical Newton's method. One of the common methods of dealing with such phase transitions is the primary variable switching (PVS) method where the choice of the primary variables is adapted locally to the phase state 'outside' the Newton loop. In order to ensure that the phase states are determined accurately, the PVS strategy requires an additional iterative loop, which can get quite expensive for highly nonlinear problems. For methane hydrate reservoir models, the PVS method shows poor convergence behaviour and often leads to extremely small time step sizes. In order to overcome this issue, we have developed a nonlinear complementary constraints method (NCP) for handling phase transitions, and implemented it within a non-smooth Newtons linearization scheme using an active-set strategy. Here, we present our numerical scheme and show its robustness through field scale applications based on the highly dynamic geological setting of the Black Sea.

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“…S g = 0 P r e p r i n t 28 S. Gupta et al An all-at-once Newton strategy for methane hydrate reservoir models 29…”

Section: Numerical Simulation and Resultsmentioning

confidence: 99%

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confidence: 99%

An All-At-Once Newton Strategy for Marine Methane Hydrate Reservoir Models

2020

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“…The conclusions achieved from the simulation on the hypothetical hydrate reservoir could only be suggestive, and the conclusions of more practical value must come from the simulations on the real hydrate reservoir. The real hydrate reservoirs in Shenhu area in the South China Sea (SCS), [10, 11, 18-20, 87, 382-386] in the Ulleung basin of the Korea East Sea, [39,68,387] at the Walker ridge 313 site, North Gulf of Mexico, [388] at the Mallik site, Mackenzie Delta, Canada, [36,37,389,390] in Qilian Mountain permafrost region [12,14,21,26] are the hottest to be simulated.…”

Section: Numerical Simulations On Ch 4 Production From Nghmentioning

confidence: 99%

Investigation into gas production from natural gas hydrate: A review

et al. 2016

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Natural gas hydrates (NGHs), which extensively exist in sea-floor and permafrost regions, are considered as an alternative energy in the future for the fossil fuels approaching depletion with the gradually increasing energy consumption. Because of the particularity of NGH stabilizing only in the conditions of the high pressure and the low temperature, the exploitation of NGH is distinguished from those of petroleum and natural gas. Researchers over the world are devoting themselves to developing the technologies of NGH exploitation. However, till now, few NGH exploitation technology is identified and employed to exploit commercially NGH. Although there do be two cases of short-term NGH exploitation in Mackenzie Delta (CAN), Alaska North Slope (USA) and Nankai Trough (JAP) in the past 10 years. It is mainly because some characteristics of the flow (gas, water, gas-hydrate slurry, quicksand, etc.), the issues of heat and mass transfer, the risk assessment and the economic evaluation are still not comprehensively recognized. Presently, the researches of NGH exploitation are mainly carried out from three aspects, numerical simulation and analysis, experimental simulation and field trial exploitation for the different technologies. In this paper, we comprehensively review the relevant studies of NGHs and propose our comments. We not only represent the achievements for the NGH exploitation researches, but also discuss the limitations and challenges, raise some questions and put forward some suggestions from our points of view.

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“…In order to evaluate and develop the production potential of the gas hydrate deposits, production using TOUGH+HYDRATE was estimated (Moridis et al, , ). Kneafsey and Moridis () carried out a numerical simulation in connection with a laboratory experiment to evaluate gas hydrate production using the depressurization method, and such studies are needed (Janicki et al, ).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Dissociation Behavior at Critical Gas Hydrate Saturation Using Depressurization Method

et al. 2019

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The Korea Institute of Geoscience and Mineral Resources conducted depressurization experiments at various gas hydrate saturation conditions, using mini pressure cells, to determine critical gas hydrate saturation. Their results indicated that it is necessary to carry out a numerical simulation in connection with the experiments to determine the critical gas hydrate saturation at numerous conditions that could not be incorporated into the experiments. In this study, a numerical simulation model, which simulated a mini pressure cell, was developed to verify the results of the aforementioned experiments. The changes in the fluid density and computer tomography values showed a similar trend. The validated numerical simulation model was used to determine the dissociation behaviors and productivities for various gas hydrate saturation levels (10–80%). As the gas hydrate saturation increased, the fluid permeability decreased. The gas hydrate dissociation was slowed by this correlation, and the production of gas and water was delayed at 50–60% gas hydrate saturation. Thus, the critical gas hydrate saturation was determined to be 50–60% for the experimental conditions of the field production test at the Ulleung Basin, East Sea, Korea. A pressure difference was noticed between the production and injection points due to the pressure propagation being delayed at critical gas hydrate saturation. Verifying the results of the experiments proved useful to understanding the dissociation and multiphase flow patterns in various depressurization scenarios.

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Simulation of Subsea Gas Hydrate Exploitation

Cited by 13 publications

References 21 publications

An All-At-Once Newton Strategy for Marine Methane Hydrate Reservoir Models

An All-At-Once Newton Strategy for Marine Methane Hydrate Reservoir Models

Investigation into gas production from natural gas hydrate: A review

Numerical Analysis of Dissociation Behavior at Critical Gas Hydrate Saturation Using Depressurization Method

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