Influence of Reservoir Stimulation on Marine Gas Hydrate Conversion Efficiency in Different Accumulation Conditions

Yang, Lin; Chen, Chen; Jia, Rui; Sun, Youhong; Guo, Wei; Pan, Dong; Li, Xitong; Chen, Yong

doi:10.3390/en11020339

Cited by 32 publications

(15 citation statements)

References 32 publications

(42 reference statements)

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“…Yang et al investigated the influence of different strategies of hydraulic fracturing on the conversion efficiency of gas hydrate under different saturation and intrinsic permeability and attempted to optimize the operation. 144 It was denoted that hydraulic fracturing substantially increased the gas hydrate conversion efficiency and the density of fractured networks had great influence for the conversion efficiency. In addition, under lower permeability and saturation conditions, the improvement effect of hydraulic fracturing became more obvious, which indicated that it was more preferable for the hydrate exploitation in the SCS.…”

Section: Advances On Natural Gas Hydratementioning

confidence: 99%

“…So far, the most accessible reservoirs stimulation technique for gas hydrate reservoirs is hydraulic fracturing. Yang et al investigated the influence of different strategies of hydraulic fracturing on the conversion efficiency of gas hydrate under different saturation and intrinsic permeability and attempted to optimize the operation . It was denoted that hydraulic fracturing substantially increased the gas hydrate conversion efficiency and the density of fractured networks had great influence for the conversion efficiency.…”

Section: Advances On Natural Gas Hydrate Exploitation In the Scsmentioning

confidence: 99%

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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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Section: Advances On Natural Gas Hydratementioning

confidence: 99%

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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“…The interaction between the factors shall not be underestimated [50]. Due to the limitation of the single factor experiments, the continuous point cannot be analyzed, and the interaction among various factors is not considered.…”

Section: Response Surface Analysis Of Variables To Srvmentioning

confidence: 99%

Uncertainty Analysis of Factors Influencing Stimulated Fracture Volume in Layered Formation

et al. 2019

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Hydraulic fracture dimension is one of the key parameters affecting stimulated porous media. In actual fracturing, plentiful uncertain parameters increase the difficulty of fracture dimension prediction, resulting in the difficulty in the monitoring of reservoir productivity. In this paper, we established a three-dimensional model to analyze the key factors on the stimulated reservoir volume (SRV), with the response surface method (RSM). Considering the rock properties and fracturing parameters, we established a multivariate quadratic prediction equation. Simulation results show that the interactions of injection rate (Q), Young’s modulus (E) and permeability coefficient (K), and Poisson’s ratio (μ) play a relatively significant role on SRV. The reservoir with a high Young’s modulus typically generates high pressure, leading to longer fractures and larger SRV. SRV reaches the maximum value when E1 and E2 are high. SRV is negatively correlated with K1. Moreover, maintaining a high injection rate in this layered formation with high E1 and E2, relatively low K1, and μ1 at about 0.25 would be beneficial to form a larger SRV. These results offer new perceptions on the optimization of SRV, helping to improve the productivity in hydraulic fracturing.

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“…The most typical hydrate-forming gas is methane, and NGH mainly occurs in terrestrial permafrost and offshore sediments where low temperature and high-pressure conditions needed by hydrate stabilization are met (Collett, 2002;Koh, 2002;Chong et al, 2016). As a potential new unconventional energy, NGHs are currently attracting significant attention owing to their extensive distribution, great resource potential, high energy density, and low environmental pollution (Koh et al, 2012;Yang et al, 2018). Current estimations of the hydrate-containing hydrocarbon gas available at standard conditions ranges from 10 15 to 10 18 m 3 , which is twice as much as the conventional fossil energy (Moridis et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Combined Brine Flooding With Electrical Heating–Assisted Depressurization for Exploitation of Natural Gas Hydrate in the Shenhu Area of the South China Sea

Zhang

Wang

2022

Front. Earth Sci.

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The Shenhu area of the South China Sea (SCS) is one of the most promising fields for natural gas hydrate (NGH) exploitation. However, previous studies conclude that using only depressurization is inefficient for this challenging hydrate deposits surrounded by permeable water zones, which requires assistance by thermal stimulation to promote hydrate decomposition and methane recovery. However, traditional thermal stimulation methods with hot water or steam injection induce massive heat loss along the wellbore. In addition, in situ electrical heating only results in a limited high temperature region due to low thermal conductivity of hydrate deposits. Therefore, we numerically investigate the performance of combined brine flooding with electrical heating–assisted depressurization in horizontal wells for exploitation of natural gas hydrate in the SCS, which simultaneously possesses the merits of low heat loss and enhanced heat transfer by convection. Our simulation results show that thermal stimulation by combined brine flooding with electrical heating can significantly enhance hydrate dissociation and methane recovery. After 20 years of production, the cumulative methane production of combined brine flooding with electrical heating–assisted depressurization is 1.41 times of that conducted by the only depressurization method. Moreover, the energy efficiency can be improved by reducing electrical heating time, and terminating electrical heating with 70% hydrate dissociation achieves the highest net energy gain. In addition, methane recovery and net energy gain increases with electrical heating power and brine injection pressure but with a decreasing rate. Therefore, the selection of electrical heating power and brine injection pressure should be performed carefully and comprehensively considering both the efficiency of gas production and risks of geological hazard. It is hoped that our research results will provide reference and guidance for the development of a similar NGH reservoir in order to promote the industrial development process of NGH.

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Influence of Reservoir Stimulation on Marine Gas Hydrate Conversion Efficiency in Different Accumulation Conditions

Cited by 32 publications

References 32 publications

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

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

Uncertainty Analysis of Factors Influencing Stimulated Fracture Volume in Layered Formation

Numerical Simulations of Combined Brine Flooding With Electrical Heating–Assisted Depressurization for Exploitation of Natural Gas Hydrate in the Shenhu Area of the South China Sea

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