Tuning the fluid production behaviour of hydrate-bearing sediments by multi-stage depressurization

Gao, Qiang; Yin, Zhenyuan; Zhao, Junfang; Yang, Dinglong; Linga, Praveen

doi:10.1016/j.cej.2020.127174

Cited by 75 publications

(48 citation statements)

References 58 publications

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“…At the same time, natural gas as a fuel is much more environmentally friendly than coal and oil since it has a high calorific value; when it is burned, only carbon dioxide and water are formed [9,15]. Four main methods of gas hydrate field development have been proposed [16]: depression [17,18], heating [19,20], injection of inhibitors [21][22][23], and replacement with carbon dioxide [24,25]. In this regard, the study of the formation and decomposition of gas hydrates in porous media is a key point for a fundamental understanding of natural gas hydrates' behavior, the development of technologies for their extraction and practical application in the processes of transportation and storage.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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The development of technologies for the accelerated formation or decomposition of gas hydrates is an urgent topic. This will make it possible to utilize a gas, including associated petroleum one, into a hydrate state for its further use or to produce natural gas from hydrate-saturated sediments. In this work, the effect of water content in wide range (0.7–50 mass%) and the size of quartz sand particles (porous medium; <50 μm, 125–160 μm and unsifted sand) on the formation of methane and methane-propane hydrates at close conditions (subcooling value) has been studied. High-pressure differential scanning calorimetry and X-ray computed tomography techniques were employed to analyze the hydrate formation process and pore sizes, respectively. The exponential growth of water to hydrate conversion with a decrease in the water content due to the rise of water–gas surface available for hydrate formation was revealed. Sieving the quartz sand resulted in a significant increase in water to hydrate conversion (59% for original sand compared to more than 90% for sieved sand). It was supposed that water suction due to the capillary forces influences both methane and methane-propane hydrates formation as well with latent hydrate forming up to 60% either without a detectable heat flow or during the ice melting. This emphasizes the importance of being developed for water–gas (ice–gas) interface to effectively transform water into the hydrate state. In any case, the ice melting (presence of thawing water) may allow a higher conversion degree. Varying the water content and the sand grain size allows to control the degree of water to hydrate conversion and subcooling achieved before the hydrate formation. Taking into account experimental error, the equilibrium conditions of hydrates formation do not change in all studied cases. The data obtained can be useful in developing a method for obtaining hydrates under static conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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“…Some physical barriers to stop the migration of unnecessary water are possible ideas, and biotechnical barriers using in-situ microble (Hata et al, 2020) and waterglass (sodium silicate, Ito et al, 2014) may reduce the permeability in the broader domain far away from the borehole because the treatment media do not contain solid particles and then penetrate the formation easily. As a different idea, Gao et al (2021) proposed to manage the water production by optimizing the depressurization process using data from laboratory experiments. Guo et al (2020) proposed that the stepwise control of the depressurization process can decrease the water production, with enhancement of gas production by thermal stimulation.…”

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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“…It was concluded that the stage number of multistage depressurization controlled the rate of hydrate dissociation and has an energy efficiency ratio improvement by 36.6%, relative to single-stage depressurization. 150 5.4. Exploitation Strategy Differentiation.…”

Section: Advances On Natural Gas Hydratementioning

confidence: 99%

“…Also, Gao et al examined the gas and water production behaviors under multistage depressurization. It was concluded that the stage number of multistage depressurization controlled the rate of hydrate dissociation and has an energy efficiency ratio improvement by 36.6%, relative to single-stage depressurization …”

Section: Advances On Natural Gas Hydrate Exploitation In the Scsmentioning

confidence: 99%

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Jian-wu

2021

Energy Fuels

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Because of the urgency of energy transition for a net-zero society, the world’s gas demand is rapidly increasing. Natural gas hydrate (NGH) is regarded as the next alternate energy resource to meet the demand, thanks to its high energy density and enormous reserves. As two successful production trials and a series of relevant drilling expeditions were implemented in the northern slope of the South China Sea (SCS), it may now be the most promising district for NGH exploitation in the world. The objective of this work is to review the recent research advances on hydrate exploration status, reservoir geological features, hydrate-bearing sediment geophysical properties, and hydrate exploitation techniques related to the hydrate reservoirs in the SCS. Geological surveys, well logging and core sampling were performed and helped the analysis of hydrate occurrence, gas origin, and accumulation mechanism. It is inferred that both microgenic and thermogenic gas present in SCS hydrate reservoirs and the hydrate accumulation is primarily controlled by the structure of the gas chimney. The characteristics of high porosity, low permeability, weak diagenesis, weak strength, and complex hydrate dissociation behaviors of the gas hydrate-bearing sediments from the SCS determined that innovative exploitation approaches are required. Different well configurations and reservoir stimulation techniques were proposed to enhance the production efficiency and evaluated through simulation and laboratory experiments. As the NGH development process in the SCS progresses continuously, it attracts more and more research interests from academic and engineering communities. We are convinced that, with constant diligence and effort, China will achieve the goal of safe and efficient commercial exploitation in the near future.

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Tuning the fluid production behaviour of hydrate-bearing sediments by multi-stage depressurization

Cited by 75 publications

References 58 publications

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

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

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

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