Using Submarine Heat Pumps for Efficient Gas Production from Seabed Hydrate Reservoirs

Mori, Yasuhiko H.; Ochiai, Jun ichi; Ohmura, Ryo

doi:10.3390/en5030599

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…In detail, a finite amount of heat input can effectively augment the rate of NGH dissociation. By contrast, if excessive and indiscriminate heat is input, the only a little facilitating effect on the NGH dissociation may be obtained due to the heating of sediments and gas–liquid phase in porous, and the massive and meaningless heat loss to the external environment, helping us understand the importance of the principle of “directional and quantitative heat supply” to reduce unnecessary heat loss. , A large number of experiments also have shown that the use of the in-situ heating method in HBS with high NGH saturation can achieve promising ξ and EER, and mutative scale optimization of the heating rate, rather than a constant heating rate, may be the best strategy for hydrate exploitation with the dynamic change of the temperature and three-phase saturation in the course of NGH dissociation . Besides, some regularity of the influence of the initial free water in HBS and the decomposed water from NGH, porosity, depth, and thickness of HBS and length of production wells on EER also needs to be studied when using the heat thermal stimulation method …”

Section: Methods Of Gas Recovery From Hbsmentioning

confidence: 99%

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

et al. 2022

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Safe, efficient, and economical gas recovery from hydrate-bearing sediments (HBS) is a severe issue that determines if natural gas hydrate (NGH), as an alternative energy in the future as fossil fuels approach depletion, is applied. Researchers worldwide are committed to developing a safe, efficient, and economical method of gas recovery from HBS. However, until now, most methods are still being validated and not have not been identified to exploit NGH commercially. Therefore, it is appropriate and significant to discuss researchers’ achievements to exploit NGH and summarize their potential benefits and challenges. This paper introduces nearly all the conventional and latest NGH exploitation methods and reviews field trials’ development characteristics. On the basis of laboratory experiments and field trials, key challenges restricting safe and efficient NGH development, and the existing research gaps reflecting these challenges, are also presented from the gas production, security, and economic aspects. The unfavorable situation mainly comprises the insufficient sensible heat, extremely low thermal conductivity, and ultralow permeability of HBS, lower gas production rate and its intense fluctuations, higher water-to-gas ratio (WGR), geological deformation, and subsidence of HBS attributed to excessive sand production, driving the consideration of some possible solutions. Given this, a new method for enhanced gas production from HBS based on the combination of depressurization (DP) and an in-situ heat generation method is proposed. Benefiting from multiple theoretical enhancement mechanisms such as replenishing energy to HBS with in-situ heat generation powders, cementing and strengthening the HBS skeleton, improving the gas permeability in HBS, decreasing the WGR based on blocking water, and removing gas characteristics of hydration products, this method could be expected to achieve promising long-term performance of gas production, which will be theoretically and practically significant to study commercial gas production.

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Section: Methods Of Gas Recovery From Hbsmentioning

confidence: 99%

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

et al. 2022

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“…It is important to apply an effective heat source and to reduce loss in the heat generation process. Electrical heating (Callarotti, 2011;Minagawa et al, 2018), an application of heat pump to collect sea water temperature (Mori et al, 2012), geothermal energy (Japan Drilling Company, 2009), and backfilling of chemical heat sources (Xu et al, 2021) have been proposed. Among those techniques, Callarotti (2011) estimated EROI of the thermal stimulation with electric heating using analytical solutions and obtained as in the range of 4-5 without considering the efficiency of power generation.…”

Section: Heat Demand and Output By Gas Production Methods Production Techniques And Theoretical And Laboratory Evaluationmentioning

confidence: 99%

Review of Energy Efficiency of the Gas Production Technologies From Gas Hydrate-Bearing Sediments

Yamamoto¹,

Nagakubo²

2021

Front. Energy Res.

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Even in the carbon-neutral age, natural gas will be valuable as environment-friendly fuel that can fulfill the gap between the energy demand and supply from the renewable energies. Marine gas hydrates are a potential natural gas source, but gas production from deposits requires additional heat input owing to the endothermic nature of their dissociation. The amount of fuel needed to produce a unit of energy is important to evaluate energy from economic and environmental perspectives. Using the depressurization method, the value of the energy return on investment or invested (EROI) can be increased to more than 100 for the dissociation process and to approximately 10 or more for the project life cycle that is comparable to liquefied natural gas (LNG) import. Gas transportation through an offshore pipeline from the offshore production facility can give higher EROI than floating LNG; however, the latter has an advantage of market accessibility. If the energy conversion from methane to hydrogen or ammonia at the offshore facility and carbon capture and storage (CCS) can be done at the production site, problems of carbon dioxide emission and market accessibility can be solved, and energy consumption for energy conversion and CCS should be counted to estimate the value of the hydrate resources.

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“…Mori et al [2] proposed using submarine heat pumps that have a distinct thermodynamic advantage over other thermal stimulation techniques for energy saving potential. Peigné et al [3] designed a system to heat a low-energy building by coupling a heat-recovery ventilation system with a three-fluid heat exchanger located on the chimney of a wood-pellet stove and their case study results showed that heat transfer rates can be predicted with a relative difference lower than 5%.…”

Section: Introductionmentioning

confidence: 99%

Research on Energy Saving Potential for Dedicated Ventilation Systems Based on Heat Recovery Technology

Zhang

2014

Energies

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Abstract:Research results have identified the use of heat pipe heat exchangers (HPHXs) for heat recovery as a way to reduce the pre-cooling and re-heating energy. This paper suggests decoupling dehumidification from cooling to reduce energy consumption. The feasible usage and the energy saving potential of heat pipe heat exchanger at the air handler dedicated in accomplishing this objective is investigated. In this paper a dedicated ventilation system combined with a HPHX to reduce energy consumption is tested and investigated under varying conditions by laboratory experiments. The energy saving potential and heat pipe (HP) effectiveness are tested and calculated under various outdoor conditions. The simulation and experimental results demonstrate that for all cases examined, the average HP effectiveness and energy savings have the same trend at various outdoor temperatures and Relative Humidity (RH) values. It has been found that the heat pipe can be applied to save over 60% energy for the air-conditioning operating hours. The reduction in overall energy is from 1.8% to 2.8% for the whole system. Therefore, the results confirm that the proposed set-up is useful for buildings to achieve intended energy saving objectives in subtropical climates where air-conditioning demand is highly variable.

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Using Submarine Heat Pumps for Efficient Gas Production from Seabed Hydrate Reservoirs

Cited by 5 publications

References 20 publications

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

Review of Energy Efficiency of the Gas Production Technologies From Gas Hydrate-Bearing Sediments

Research on Energy Saving Potential for Dedicated Ventilation Systems Based on Heat Recovery Technology

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