Permeability of hydrate-bearing fine-grained sediments: Research status, challenges and perspectives

Zhang, Zhun; Liu, Lele; Lü, Wanjun; Liu, Changling; Ning, Fulong; Dai, Sheng

doi:10.1016/j.earscirev.2023.104517

Cited by 23 publications

(2 citation statements)

References 208 publications

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“…38 The volume of the experimental sediment sample is 500 cm 3 . The sediment used in this experiment is mainly unconsolidated and loose sediment, 39 which is the main medium for hydrate storage in the Shenhu Sea of the South China Sea. Sediment media C was formulated based on the composition of sediment B grain size media in the 2017 test mining area, 40 whose grain size characteristics are shown in Figure 2, and it has similar grain size characteristics to the field borehole sediments in the Shenhu Sea of the South China Sea.…”

Section: Methodsmentioning

confidence: 99%

Experiment on Gradient Depressurization Gas Hydrate Breakdown in Sediments with Varied Saturation Levels

Liu,

Lu,

Zhang

et al. 2024

Energy Fuels

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The depressurization method is considered to be one of the most promising gas hydrate extraction methods. With the use of a gas hydrate decomposition simulation test system, four gradient depressurization modes and four depressurization intervals were considered under two hydrate saturation conditions, namely, 24−35 and 46−64%, to simulate the borehole pressure and salinity in the test mining location. The findings indicate that the duration of decomposition is influenced by the level of hydrate saturation, with higher saturation resulting in a greater decrease in decomposition time compared to lower saturation levels when subjected to a pressure decline of 3 MPa. Specifically, the decomposition times of Run 2−2a, Run 3−2a, and Run 4−2a at hydrate saturation of 46−64% decrease by 37.57, 21.57, and 43.20%, respectively, in relation to Run 2−1a, Run 3−1a, and Run 4−1a at hydrate saturation of 24−35%. The highest rates of instantaneous hydrate decomposition were observed in the early stages of mining. Within the larger pressure drop, the initial stage of decomposition exhibited a higher rate, while within the lower decrease in pressure interval, the initial stage of decomposition showed a lower rate. Furthermore, the peak instantaneous decomposition rate decreased gradually as the decrease in the pressure gradient increased. The mean speed of hydrate decomposition under the gradient depressurization modes exhibited varying degrees of decrease as the pressure drop gradient increased. Specifically, the average decomposition rates of Run 2−2a, Run 3−2a, and Run 4− 2a fell by 61.27, 64.64, and 69.21%, respectively, compared to those of Run 1−2a. The implementation of gradient depressurization modes has the potential to decrease the likelihood of unforeseen hydrate reformation or cementation, raise the gas efficacy of output, decrease the maximum rate of gas production, bolster the stability of hydrates, and guarantee stability within the reservoir and wellbore.

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Section: Methodsmentioning

confidence: 99%

Experiment on Gradient Depressurization Gas Hydrate Breakdown in Sediments with Varied Saturation Levels

Liu,

Lu,

Zhang

et al. 2024

Energy Fuels

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“…, gas separation, gas storage, juice concentration, cold storage, sludge dewatering, wastewater treatment, seawater desalination, and CO 2 sequestration . Among various gas hydrates, CH 4 hydrate stands out as an exceedingly promising clean energy source to replace traditional fossil energy, due to its wide distribution, huge reserves, high energy density, and low CO 2 emissions. − In the context of mounting energy scarcity and climate change concerns, efficient exploration and utilization of CH 4 hydrates have become a subject of intense interest in scientific and industrial circles. − Recent two decades have witnessed the execution of several field tests targeting CH 4 hydrate in diverse geographical locations, including the Shenhu area of the South China Sea (sea area), the Nankai Trough of Japan (sea area), the Qilian Mountains of China (land area), the North Slope of Alaska of the United States (land area), and the Mackenzie Delta of Canada (land area) . In addition, comprehensive field investigations and resource assessments have been conducted in regions such as the Ulleung Basin of Korea, the Krishna–Godavari and Mahanadi Basins of India, and the Storegga Slide offshore of Norway .…”

Section: Introductionmentioning

confidence: 99%

Effect of Glucose on CH₄ Hydrate Formation in Clay Nanopores and Bulk Solution: Insights from Microsecond Molecular Dynamics Simulations

Mi,

He,

Jiang

et al. 2024

ACS Sustainable Chem. Eng.

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A microscopic insight into the formation and growth of CH 4 hydrate in glucose solution is vital to understand the accumulation of natural gas hydrate resources and develop hydrate-based technologies. Herein, microsecond MD simulations have been performed to investigate the formation and growth of CH 4 hydrate in glucose solution inside and outside of the montmorillonite nanopore to examine the effects of glucose concentration and salt ions. Simulation results indicate that glucose molecules inhibit the growth and formation of CH 4 hydrate by controlling the size of the CH 4 nanobubbles. Specifically, glucose molecules adsorb H 2 O and Na + and repel CH 4 , thus greatly promoting nanobubble formation and inhibiting hydrate formation. Glucose molecules adsorbed on nanobubble surfaces hinder nanobubble decomposition and inhibit hydrate growth. The higher the glucose concentration, the more unfavorable the hydrate formation. Furthermore, ions and glucose can construct abnormal cages and can also adsorb on hydrate surfaces by forming hydrogen bonds with the water in hydrate solids. These ions and glucose will pose challenges to the subsequent solid−liquid separation in hydrate-based applications. These molecular insights are of scientific and engineering significance to sustainable chemistry related to exploitation of natural gas hydrate and hydrate-based technologies, e.g., seawater desalination and juice concentration.

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Experimental investigation on the geological responses and production behaviors of natural gas hydrate-bearing sediments under various hydrate saturations and depressurization strategies

Zhao,

Hu,

Dou

et al. 2024

Applied Energy

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Permeability of hydrate-bearing fine-grained sediments: Research status, challenges and perspectives

Cited by 23 publications

References 208 publications

Experiment on Gradient Depressurization Gas Hydrate Breakdown in Sediments with Varied Saturation Levels

Experiment on Gradient Depressurization Gas Hydrate Breakdown in Sediments with Varied Saturation Levels

Effect of Glucose on CH₄ Hydrate Formation in Clay Nanopores and Bulk Solution: Insights from Microsecond Molecular Dynamics Simulations

Experimental investigation on the geological responses and production behaviors of natural gas hydrate-bearing sediments under various hydrate saturations and depressurization strategies

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Permeability of hydrate-bearing fine-grained sediments: Research status, challenges and perspectives

Cited by 23 publications

References 208 publications

Experiment on Gradient Depressurization Gas Hydrate Breakdown in Sediments with Varied Saturation Levels

Experiment on Gradient Depressurization Gas Hydrate Breakdown in Sediments with Varied Saturation Levels

Effect of Glucose on CH4 Hydrate Formation in Clay Nanopores and Bulk Solution: Insights from Microsecond Molecular Dynamics Simulations

Experimental investigation on the geological responses and production behaviors of natural gas hydrate-bearing sediments under various hydrate saturations and depressurization strategies

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Effect of Glucose on CH₄ Hydrate Formation in Clay Nanopores and Bulk Solution: Insights from Microsecond Molecular Dynamics Simulations