Numerical Evaluation of Gas Hydrate Production Performance of the Depressurization and Backfilling with an In Situ Supplemental Heat Method

Xu, Tao; Zhang, Zhaobin; Li, Shouding; Li, Xiao; Lü, Cheng

doi:10.1021/acsomega.1c01143

Cited by 16 publications

(9 citation statements)

References 51 publications

(75 reference statements)

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“…In this work, the lateral heat conduction was considered a one-dimension steady heat conduction problem in each temporal interval. As a conventional simplifying method (Li G. et al, 2012;Chen et al, 2018;Yu et al, 2019;Xu et al, 2021), we assumed that the expansion of the disturbed zone approximated to an axisymmetric process in a short-term production, and thus we calculated the corresponding heat using Fourier's law of heat conduction in cylindrical coordinates:…”

Section: Principle and Methodsmentioning

confidence: 99%

A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate

Sun

Lü

et al. 2022

Front. Earth Sci.

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Free gas saturation is one of the key factors that affect the overall production behaviors of hydrate reservoirs. For example, different free gas contents could alter the thermal response of hydrate reservoirs to the artificial stimulation and hence change the gas production performance. To investigate whether and how much the hydrate reservoir contains free gas, we proposed a thermodynamic method to calculate the total heat consumption of hydrate dissociation throughout gas production and assess the free gas proportion. Based on the monitoring data of the first offshore hydrate production in Japan, we calculated the total heat consumption and analyzed the contributions of heat convection, heat conduction, and sensible heat during the entire test. The calculation results showed that there is likely to be a certain amount of free gas in the hydrate reservoir in the Eastern Nankai Trough. In addition, the analysis of different heat sources revealed the critical thermodynamic phenomenon in which the reservoir sensible heat was the main source for enthalpy of hydrate dissociation, which consistently contributed more than 95% of the total heat supply during the 6-day production test. The results of this work may help upgrade the production strategy for natural gas hydrates.

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Section: Principle and Methodsmentioning

confidence: 99%

A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate

Sun

Lü

et al. 2022

Front. Earth Sci.

Self Cite

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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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“…Simultaneously, the volume of solid Ca(OH) 2 formed after the reaction increased and the number of pores increased, which not only filled the pores left by the decomposition of NGH but also improved the permeability of the reservoir. Xu et al 141 conducted a numerical simulation study on the above scheme, and the simulation results showed that fracturing combined with the CaO scheme had an obvious promoting effect on production; the cumulative gas production increased by 200%, but the cumulative water production did not change significantly.…”

Section: Jet Breakingmentioning

confidence: 99%

Reservoir Stimulation Technologies for Natural Gas Hydrate: Research Progress, Challenges, and Perspectives

Liang

2023

Energy Fuels

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The energy crisis has intensified in recent years. The current global economic environment and increasing cost of mining necessitate additional energy access channels. Previous studies have shown that natural gas hydrate reservoirs (NGHRs) contain a large number of natural gas resources. However, several problems are associated with the safe and efficient exploitation of the NGHRs. Reservoir stimulation technology is expected to address these issues. This study introduces the properties and mining difficulties of NGHRs and reviews their stimulation scheme and related research progress based on three perspectives: hydraulic fracturing, burden sealing, and near-well reconstruction. The principles, advantages, and limitations of the three schemes are compared. In addition to the stimulation effects of the three aforementioned methods, this study focused on the fracability of NGHRs, the factors influencing fracture initiation and development, and the fracturing fluid, proppant, completion fluid, and slurry suitable for NGHR stimulation. In addition, the principles, current challenges, and future research prospects for reservoir stimulation are summarized to provide a reference for the commercial exploitation of natural gas hydrates in the future.

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Numerical Evaluation of Gas Hydrate Production Performance of the Depressurization and Backfilling with an In Situ Supplemental Heat Method

Cited by 16 publications

References 51 publications

A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate

A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate

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

Reservoir Stimulation Technologies for Natural Gas Hydrate: Research Progress, Challenges, and Perspectives

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