Experimental Investigation on the Production Behaviors of Methane Hydrate in Sandy Sediments by Different Depressurization Strategies

Lv, Tao; Li, Xiao-Sen; Chen, Zhaoyang; Sun, Daofeng; Yan, Kefeng; Cai, Jing

doi:10.1002/ente.201800453

Cited by 27 publications

(24 citation statements)

References 39 publications

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“…There is still a long way to go for the hydrate commercial exploitation, because many scientific problems and technical difficulties need to be solved, such as low production efficiency, high production cost, environment hazards, solids invasion plugging, and sanding plugging. Besides, the secondary hydrate formation near a wellbore, which has been verified by previous studies, is a key issue during hydrate production. − The secondary hydrate formation is mainly caused by the endothermics of hydrate dissociation and the “Joule-Thomson effect”. Further, the secondary hydrate formation may be inhibited by the salinity of pore water and natural organic matters contained in marine sediment.…”

Section: Introductionmentioning

confidence: 67%

Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment

Chen

et al. 2019

J. Chem. Eng. Data

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The phase equilibrium conditions for methane hydrate in mixed sand−clay sediment with the presence of fulvic acid (FA) and sodium chloride (NaCl) were measured using the multistep heating method. The experiments were conducted at the temperatures from 281.45 to 290.65 K and pressures from 6.33 to 17.39 MPa, respectively. The mixed sand−clay porous media and aqueous solutions containing 2.0, 6.0, and 10.0 wt % FA and 3.0 wt % NaCl were used. The experimental results indicate that the phase equilibrium curve of methane hydrate in mixed porous media shifts to the left side as compared to that in bulk solutions because of the capillary force and hydrophilic surfaces of porous media. FA is a thermodynamic inhibitor for methane hydrate formation as the −COO − and short alkyl substituent of FA could compete with hydrate for water molecules, and the inhibition effect of FA on methane hydrate formation is weaker as compared to 3.0 wt % NaCl under all studied concentration conditions. The phase equilibrium pressures of methane hydrate in mixed porous media with the presence of 2.0 wt % FA + 3.0 wt % NaCl, 6.0 wt % FA + 3.0 wt % NaCl, 10.0 wt % FA + 3.0 wt % NaCl are all higher than that with only 3.0 wt % NaCl present, and the pressure increases with the increase in FA concentration. The existence of FA solutions and FA + NaCl solutions in mixed porous media does not affect the methane hydrate structure.

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Section: Introductionmentioning

confidence: 67%

Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment

Chen

et al. 2019

J. Chem. Eng. Data

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“…As a result of the decrease in the decomposition rate of hydrates and heat transfer from surrounding environments, the temperature of hydrate-bearing sediments gradually rises at this stage. 69,91,94 The experimental images given by Linga and Heeschen reflected the three-stage characteristic of hydrate decomposition in reservoirs. 62,74 The depressurization method provides a driving force for dissociation of hydrates by changing the gas production pressure.…”

Section: Gas Production By Depressurization-based Methodsmentioning

confidence: 94%

Enhancing Gas Production from Hydrate-Bearing Reservoirs through Depressurization-Based Approaches: Knowledge from Laboratory Experiments

et al. 2021

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There have been several field tests around the world to recover natural gas from gas hydrate reservoirs. A most recent trial took place in the South China Sea, breaking the records of cumulative and daily gas yield from marine hydrate deposits. However, significant challenges still remain while approaching commercial gas production. These may involve but are not limited to the ultralow permeability of the reservoir, insufficient heat supply, unstable gas yield fluctuations, sand problem upon water production from the silty sediments, and secondary hydrate formation or ice generation blocking the pore spaces. Consequently, intensive efforts have been made to understand and, thereby, manipulate the complicated gas production process. Of special interest are the studies on the determination and optimization of the depressurization scheme, because depressurization is recognized to be most promising toward an economically efficient gas recovery. Therefore, in this work, we elaborated on the effects of pressure regulation on the behavior of gas and water yield and characteristics of the reservoir during the gas production process through depressurization-based approaches. Particular attention was paid on the enhancement of the gas production rate and energy efficiency under various scenarios. The advantages and limitations of the current investigation were also discussed to present preliminary suggestions and perspectives for future studies. This work could provide a brief view of the current efforts on improving the gas production efficiency at a laboratory scale; further investigations are still required to scale-up these findings to provide guidance to the field test in the future.

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“…Lv et al conducted experiments in a cubic hydrate simulator and indicated that, compared to single-step depressurization, multistep depressurization has the advantages of welldistributed gas production and low energy consumption intensity. 134 Zhao et al also optimized the depressurization method by designing a stepwise process. 149 They supposed that the fine-size marine sediments in the SCS may block the production well and impede the gas production.…”

Section: Advances On Natural Gas Hydratementioning

confidence: 99%

“…Specifically, strategies of depressurization method can be another aspect to improve hydrate exploitation efficiency. Lv et al conducted experiments in a cubic hydrate simulator and indicated that, compared to single-step depressurization, multistep depressurization has the advantages of well-distributed gas production and low energy consumption intensity . Zhao et al also optimized the depressurization method by designing a stepwise process .…”

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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Experimental Investigation on the Production Behaviors of Methane Hydrate in Sandy Sediments by Different Depressurization Strategies

Cited by 27 publications

References 39 publications

Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment

Effect of Fulvic Acid and Sodium Chloride on the Phase Equilibrium of Methane Hydrate in Mixed Sand–Clay Sediment

Enhancing Gas Production from Hydrate-Bearing Reservoirs through Depressurization-Based Approaches: Knowledge from Laboratory Experiments

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

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