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Article
Thermodynamics
Feifei Wang et al.
Summary: This study investigates the efficiency of natural gas hydrate production using radial horizontal wells. A multi-field coupling model is developed to describe the various processes involved and is verified using experiments. Simulation results show that radial horizontal wells have a larger and more significant effect on hydrate dissociation compared to vertical wells. Increasing the length and/or diameter of the radial horizontal wells enhances gas production rate. The study suggests that three branches are optimal for radial horizontal wells. This research provides valuable suggestions and theoretical reference for the development of natural gas hydrate reservoirs.
Article
Chemistry, Physical
Fuling Wang et al.
Summary: A composite bifunctional electrocatalyst Pt@FeSA-N-C consisting of atomically dispersed FeN4 active sites and Pt nanoparticles (NPs) has been successfully prepared for oxygen reduction reaction (ORR) and hydrogen evolution reactions (HER). Compared with the commercial 20 wt.% Pt/C, Pt@FeSA-N-C possesses a low Pt loading of 5.5 wt.% and exhibits significantly improved ORR and HER activities in acid and alkaline media, even outperforming the commercial catalyst. Furthermore, Pt@FeSA-N-C shows extraordinary stability with no obvious decrease in current density after accelerated durability tests (ADTs).
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Qiang Li et al.
Summary: Reducing the adsorption of CO2 thickeners in shallow shale soil particles is important for protecting the shale environment and water cycle. This study synthesized a siloxane-based thickener named AOB and investigated the influence of geological factors on its adsorption capacity. The adsorption behavior of AOB on soil surfaces was analyzed using a self-assembled high-pressure soil adsorption device, and the results showed that AOB had a lower adsorption capacity compared to commercial PDMS due to soil repulsion and grid drag.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Geosciences, Multidisciplinary
Qingchao Li et al.
Summary: Effective production of natural gas from hydrate-bearing sediments through various strategies is crucial in addressing the current global energy crisis. However, the dissociation of hydrates during gas production can weaken sediment strength and impact reservoir stability. This study thoroughly analyzed gas production, reservoir characteristics, and sediment deformation using the ABAQUS platform. The findings provide insights into the potential for commercial gas hydrate development and lay the groundwork for developing engineering measures to mitigate geological disasters in the hydrate production process.
NATURAL RESOURCES RESEARCH
(2023)
Article
Thermodynamics
Xiaochu Wang et al.
Summary: Low production rate, limited recovery range, and short period of stabilized production in NGH field trials indicate a large gap to commercial production. Reservoir stimulation methods such as hydraulic fracturing, jet breaking, overlying layer modification, and split grouting have been studied to improve gas recovery efficiency. Split grouting is the most promising method for both reservoir skeleton reinforcement and permeability enhancement. Further evaluations are needed for production enhancement in non-diagenetic hydrate reservoirs considering the evolution of artificial seepage channels. Future developments should focus on obtaining reliable results of NGH reservoir fracability, bridging the gap between concept design and practical application, and ensuring safe and efficient gas production through reservoir stimulation and stability.
Article
Environmental Sciences
Qiang Li et al.
Summary: The objective of this research is to study the influence of filtrate reducer and reservoir characteristics on the filtration reduction of drilling fluid during drilling and to reveal the mechanism behind it. The results show that a synthetic filtrate reducer can significantly reduce the filtration coefficient compared to a commercial filtrate reducer. The filtration coefficient of drilling fluid constructed from the synthetic filtrate reducer is much lower than that of the commercial filtrate reducer, indicating a weaker filtration capacity. Increasing reservoir temperature and shear rate also increase the filtration coefficient of drilling fluid, while low temperature and shear rate are recommended for improving filtration capacity. Therefore, it is important to choose the appropriate type and content of filtrate reducer during drilling and avoid increasing reservoir temperature and shear rate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Qingchao Li et al.
Summary: Development and utilization of clean energy is crucial for society to achieve sustainable development. This study aims to experimentally explore the dissociation characteristics of gas hydrates around wellbore during drilling operations and analyze the influence of various factors on hydrate dissociation, providing reference for effective engineering measures to prevent uncontrolled hydrate dissociation and methane leakage. The experimental results show that the acoustic velocity of hydrate-bearing sediment can be accurately expressed as a quadratic polynomial of hydrate saturation, which is essential for determining hydrate saturation in subsequent experiments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Xiaolong Ma et al.
Summary: The effects of clay type and water content on the formation and dissociation of natural gas hydrates in clayey silt sediments were experimentally investigated. The study found that the water-to-hydrate conversion ratio decreased with an increase in water content in silt and illite-silt sediments, but increased in montmorillonite-silt sediments. The temperature of sediments with lower water content decreased more during hydrate dissociation, and the temperature dropped below the freezing point due to the inhibition effect of montmorillonite on hydrate phase equilibrium. This study provides insights into the production behavior of clayey silt hydrate reservoirs.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Zuping Xiang et al.
Summary: This study investigates the deformation mechanism of hydraulic fracturing fractures in shale reservoirs under different conditions, focusing on the effects of proppant embedding and crushing. The results show that larger proppant particle size and hardness, lower sand concentration, and higher closure pressure lead to more severe proppant embedding and decrease in fracture conductivity. The findings provide important insights for evaluating the deformation mechanisms of fractures in shale reservoirs.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Thermodynamics
Xiuping Zhong et al.
Summary: This study explored the productivity of depressurisation combined with thermal stimulation in a CH-Bk reservoir, identifying the challenges faced in the development of this mode and the potential benefits of adding a fracture network. The results showed that the fracture network significantly improved the productivity of D + Ti, making it a promising mode for CH-Bk development.
Article
Energy & Fuels
Nidhal Badrouchi et al.
Summary: This research investigates and analyzes the effects of different parameters on CO2 performance in EOR in unconventional reservoirs. Results show that reducing sample size, water presence, and lowering CO2 volume can impact oil recovery factors. Additionally, cyclic injection outperforms CO2 flooding in fractured rock formations such as the Middle Bakken and Three Forks samples. The obtained results provide valuable insights for future experimental studies in unconventional reservoirs.
Article
Green & Sustainable Science & Technology
Chuanliang Yan et al.
Summary: The exploitation of natural gas hydrates with replacement by carbon dioxide can enhance the mechanical properties of reservoirs and sequester CO2 underground. This study determined the mechanical properties of samples after replacement and established the strength criterion of NGH reservoirs under CO2 replacement conditions. The results show that the replacement ratio and initial hydrate saturation affect the failure strength by influencing the cohesion of the samples.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
Zihao Li et al.
Summary: In this study, the non-monotonic relationship between fracture conductivity and proppant concentration was experimentally validated and investigated. It was found that a relatively low proppant amount can form a partial-monolayer proppant pack, which can achieve similar or even higher fracture conductivity compared to multilayer proppant structures. This finding has important economic implications.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jiaxin Shao et al.
Summary: This study investigated the salinity of flowback fracturing fluid from shale gas wells and its damage to reservoirs. The results showed that the salt concentration in shale was 1 mg/g, and the salinity of flowback fluid was about 30,000 mg/L. The analysis also revealed that the content of Na+ and Cl in shale reservoir was the highest.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Jiayi Yu et al.
Summary: This study investigates the evolution of fracture conductivity as a function of proppant loading concentration and effective stress, simulating reservoir drawdown. The results show that proppant crushing, proppant embedment, and particulate transport have significant impacts on fracture conductivity. Additionally, increasing proppant loading concentration can mitigate the stress sensitivity of conductivity.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Qingchao Li et al.
Summary: Maintaining wellbore stability is crucial for efficient production of offshore gas hydrates. Due to drilling mud invasion and disturbance, gas hydrates around the wellbore gradually break down, leading to borehole collapse. This study investigates sediment strength under different hydrate saturation and develops a new strength criterion. The impact of several critical factors on the lower limit of safe mud weight is also examined. The results show that the new criterion provides a more conservative estimation and a wider window for mud density design, contributing to borehole collapse prevention. The study highlights the temperature sensitivity of the safe mud weight window and the influence of stress difference on the design strategy for hydrate development.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Geosciences, Multidisciplinary
Xingyuan Liang et al.
Summary: With increasing demand for deep and ultra-deep gas formations, the study of fracture conductivity (FC) in high-temperature and high-pressure tight gas formations becomes crucial. This study focused on the Keshen formation in the Tarim basin in China and revealed a new approach to evaluate FC and the mechanism of enhancing FC and production through several key factors. This work is significant for optimizing hydraulic fracturing design and enhancing tight formation production.
Review
Energy & Fuels
Bo Ning et al.
Summary: This paper examines the challenges in transforming weakly-consolidated reservoirs for natural gas hydrates (NGHs) production through the analysis of cases in Japan and China. It reviews the theory and technology of hydrate reservoir transformation and engineering applications, explaining the principles and mechanisms of available stimulation technologies. Feasibility of these technologies to increase NGHs production is assessed, and future prospects, existing problems, and challenges are discussed. Suggestions for future research and development of transformation technology for weakly-consolidated NGHs reservoirs are also provided.
Article
Energy & Fuels
Haitao Wang et al.
Summary: Massive hydraulic fracturing is the most effective technology for creating fracture networks in tight oil and gas reservoirs. This study proposes a novel conductivity measurement apparatus to evaluate intersected fracture conductivity and establishes a standard measurement framework. The results show that intersected fracture conductivity evolves through three stages and is influenced by closure pressure and proppant concentration. The complexity of fracture intersecting pattern also affects conductivity.
Article
Chemistry, Multidisciplinary
Junpeng Han et al.
Summary: This study investigates the enhancement effects of multistage fractured horizontal well (MFHW) technology on gas production from clayey silt natural gas hydrate reservoirs. It is found that fractures provide a fast channel for gas and water flow, increasing the contact area between the well and the reservoir and improving gas production rate.
Article
Chemistry, Multidisciplinary
Yunfeng Liu et al.
Summary: The development of an efficient acidizing technology is crucial for the deep marine carbonate rock reservoirs in the Sichuan Basin. In this study, a heat- and shear-resistant nano-silica gelling agent CTG-1 was prepared and combined with amide compounds, effectively reducing acid filtration in the reservoir. The research results showed that the nano-silica gelling agent had superior performance compared to commonly used commercial gelling agents, with higher viscosity, friction-reducing rate, and lower fluid loss coefficient.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Zhanzhao Li et al.
Summary: This article explores a method to enhance gas production efficiency in clayey silt reservoirs by using high-pressure rotating water jets (HPRWJ) technology to construct artificial fractures. The feasibility and effectiveness of this technology are evaluated through numerical simulation in the SH7 region of the South China Sea.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yunfeng Liu et al.
Summary: This article successfully synthesized nano-SiO2@octadecylbisimidazoline quaternary ammonium salt (nano-SiO2@OBQA) by using nano-SiO2 as the core and preferably functional monomers. The results showed that nano-SiO2@OBQA exhibited good high-temperature resistance in 20% concentrated hydrochloric acid, with a corrosion inhibition rate of 61.42 g·m(-2)·h(-1) at a temperature of 180°C and a dosage of 4%. The adsorption of nano-SiO2@OBQA on the surface of the N80 steel sheet followed the Langmuir isotherm adsorption model, indicating spontaneous chemical adsorption.
REVIEWS ON ADVANCED MATERIALS SCIENCE
(2022)
Article
Multidisciplinary Sciences
Qingchao Li
Summary: This study investigates the mechanism of borehole collapse in the horizontal well system in hydrate reservoirs and determines the lower limit of the safe mud weight window based on the investigation results of borehole stability.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Petroleum
Ming Fan et al.
Summary: This study combined laboratory experiments with numerical simulations to investigate the factors affecting proppant embedment and induced fracture conductivity loss in narrow fractures. The experiments showed that long-term rock/fluid interaction leads to significant proppant embedment, and fractures with a rough surface have higher conductivity. The numerical modeling approach developed quantified the influence of proppant properties on embedment, showing a strong correlation between proppant embedment and rock mechanical properties.
Article
Thermodynamics
Shuxia Li et al.
Summary: This paper proposed a novel modified method of depressurization by hydraulic fracturing assisted with sealing burdens, which can simultaneously enhance gas production and reduce water production in hydrate reservoirs.
Article
Energy & Fuels
Gang Hui et al.
Summary: This study investigates the spatiotemporal migration of induced earthquakes during fracturing stimulation in shale reservoirs using two field cases and quantifies the effects of fluid diffusivity. The results suggest that geological characteristics and fracturing conditions have a significant impact on the spatial distribution of induced earthquakes.
Article
Energy & Fuels
Yanghui Li et al.
Summary: Methane hydrate is being widely considered as an energy source due to its environmentally friendly nature and large reserves, but it may induce geological disasters during the exploitation process, so it is necessary to comprehensively study its mechanical characteristics before commencing commercial development. The study found that under different effective confining pressures, there were differences in the results of multistage and single-stage triaxial loading tests, and the elastic modulus obtained also varied.
Article
Energy & Fuels
Xiaolong Ma et al.
Summary: This study investigates the effects of reservoir properties and fracturing execution parameters on hydraulic fracturing of natural gas hydrate (NGH) reservoirs using a 2D numerical model. The results indicate that fracture initiation pressure is influenced by gas hydrate saturation, reservoir intrinsic permeability, and in situ horizontal stress, while a higher injection rate of fracturing fluid leads to wider and longer fractures. These findings contribute to a better understanding of hydraulic fracturing in NGH reservoirs and the development of potential reservoir stimulation strategies.
Article
Energy & Fuels
Jiafei Zhao et al.
Summary: The study found that fracturing can significantly improve gas production efficiency in hydrate-bearing sediments, particularly those with low permeability. The depth of fractures plays a critical role in enhancing gas production efficiency, while timely and adequate heat supply is essential for continuous gas production.
Article
Energy & Fuels
Yuxuan Liu et al.
Summary: This study established a prediction model for the conductivity of monolayer-supported fractures with multi-particle size distributions, showing that different particle size combinations can significantly impact the fracture conductivity. The permeability increases linearly with an increase in the proppant proportion. Furthermore, the study found that the choice of proppant particle sizes and their combinations play a crucial role in conductivity, with certain particle size ratios resulting in the lowest conductivity.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Xiuping Zhong et al.
Summary: The stimulation effect of the fracture network on hydrate development by depressurization combined with hot water injection was explored. The results showed that the fracture network significantly improved CH4 production of D + T-iw, while the change in fracture spacing caused a hydrate decomposition mode transformation with different effects on CH4 production rate.
Article
Energy & Fuels
Tao Yu et al.
Summary: The study found that horizontal fractures significantly enhance long-term gas production, while vertical branch fractures mainly contribute to short-term gas recovery. By combining fractures, gas production rate can be improved effectively, thereby reducing the number of horizontal wells required.
Article
Energy & Fuels
Zou Yushi et al.
Summary: Hydraulic fracture propagation differs significantly between matrix-supported fine conglomerate and grain-supported medium conglomerate, with the former allowing easier proppant transport due to straighter fractures while the latter faces challenges in proppant movement through tortuous paths. Using a high proportion of fine proppants under high closure stress can improve fracture conductivity and well performance.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
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Energy & Fuels
Xin Ju et al.
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Cong Lu et al.
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(2020)
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Jian-liang Ye et al.
Review
Geosciences, Multidisciplinary
K. P. Lijith et al.
MARINE AND PETROLEUM GEOLOGY
(2019)
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JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2019)
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(2019)
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ENERGY SCIENCE & ENGINEERING
(2019)
Article
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ARABIAN JOURNAL OF GEOSCIENCES
(2018)
Article
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Chuanliang Yan et al.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2018)
Article
Chemistry, Physical
Chuanliang Yan et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
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Geochemistry & Geophysics
Kathleen Sell et al.
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Zou Caineng et al.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2015)
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Zheng Su et al.
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Geochemistry & Geophysics
Xiujuan Wang et al.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2011)
Article
Chemistry, Applied
Shicai Sun et al.
JOURNAL OF NATURAL GAS CHEMISTRY
(2011)
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Wang Xuezhong et al.
