Xiang Sun

Institute of Rock and Soil Mechanics

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Yanghui Li

Dalian University of Technology

Peng Wu

Dalian University of Technology

Weiguo Liu

Dalian University of Technology

Yongchen Song

Dalian University of Technology

Yongchen Song

Dalian University of Technology

Shi Shen

Dalian University of Technology

Tingting Luo

China University of Mining and Technology

Lei Wang

Beijing University of Chemical Technology

Zeshao You

Dalian University of Technology

Fanbao Cheng

Dalian University of Technology

Cooperative Institutions

Dalian University of Technology

Chinese Academy of Sciences

China University of Mining and Technology

Dalian Ocean University

University of California, Berkeley

Zhejiang University of Technology

University of Chinese Academy of Sciences

Kyoto University

Tsinghua University

Beihang University

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Mechanical properties of consolidated water-saturated natural gas hydrate-bearing silty-clayey sediments under undrained shearing conditions

International Journal of Hydrogen Energy (2024)

Aowang Wang Chenyi Zhang Tingting Luo Chaozheng Ma Yi Zhao

Shearing (physics)

10.1016/j.ijhydene.2024.12.271

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Citations (1)

Hydrate Production Behavior in China’s Second Marine Trial Production Site under High Irreducible Water Saturation and a Strong Sealing Effect

Energy & Fuels (2024)

Houzhen Wei Yi Zhang Xiaolong Ma Xiang Sun

In the second depressurization test production of marine natural gas hydrates (NGHs) in China, gas was successfully produced from low-permeability clayey silt NGHs through a horizontal depressurization well, setting a new record for marine NGHs production. Although significant success has been achieved at the field scale, there is still limited research on its production behavior. In this paper, a layered heterogeneous horizontal well production numerical model was established based on logging data from this field production site. First, the cumulative gas production volume for 30 and 42 days was successfully fitted through numerical simulation, and the short-term production behavior under different irreducible water saturation (Sirw) was studied in detail. An increase in Sirw during short- and long-term production can increase the flow of free gas toward the production well, thereby increasing gas production. During the long-term production process, a barrier area with high hydrate saturation in the bottom of the hydrate-bearing layer (HBL) hinders the further upward expansion of the decomposition front. Meanwhile, due to the relatively large amount of movable water, the barrier area formed at low Sirw is relatively small. Through this study, it is helpful to reveal the hydrate production behavior of the horizontal well under high Sirw and a strong sealing effect.

Cabin pressurization

Saturation (graph theory)

Clathrate hydrate

10.1021/acs.energyfuels.3c03612

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Nitrogen and sulfur co-doped graphene supported PdW alloys as highly active electrocatalysts for oxygen reduction reaction

International Journal of Hydrogen Energy (2018)

Xiang Sun Wanhui Li Hongwei Mi Yongliang Li Peixin Zhang

10.1016/j.ijhydene.2018.01.093

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Douching and probing of lacrimal passage for treatment dacryocystistis neonatorum

Bulletin of The Academy of Military(Medical Sciences) (2005)

Xiang Sun

Objective:To explore the best therapy of dacryocystitis neonatorum.Methods:For the patients over 3 months old, the lacrimal passage irrigation was often used under superficial anesthesia.Adequate antibiotics and dexamethasone were added to the irrigating saline.Results:The lacrimal passage irrgation was effective in 24% of 3 422 eyes in 2 633 cases .The cure ratio of probing was 51% in first time,and 21.7% in the second.The total cure ratio was 96.7%.Conclusion:The best period for treatment of the dacryocystitis neonatorum is between 3-6 months old.The douching and probing of lacrimal passages are not only safe but also effective for treatment of dacryocystitis neonatorum.

Dacryocystitis

Lacrimal sac

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Determination of Arsenic and Mercury Simultaneously with Hydride Generation Atomic Fluorescence Method

Journal of Medical Pest Control (2010)

Xiang Sun

Objective The establishment of simultaneous determination of total mercury and arsenic in water samples by hydride generation atomic fluorescence spectrometry.Method At a certain acidity reaction of potassium bromate and potassium bromide bromine,so that the mercury in all digestion samples converted to inorganic mercury,and then potassium borohydride reduction of mercury into the atomic state.Arsenic in hydrochloric acid medium,potassium borohydride to arsenic into arsine achieved mercury in water,the simultaneous determination of arsenic,and various analytical conditions were optimized and discussed.Results The determination of mercury,arsenic recoveries were 98.1%-104.9%,98.6%-107.0%,and the detection limit of arsenic was 0.09μg / L,mercury 0.005μg / L.Conclusions The determination of mercury in water samples,arsenic with satisfactory results.

Mercury

Hydrochloric acid

Potassium bromate

Potassium bromide

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Effects of Pb

Japanese Journal of Applied Physics (2015)

Chuanbao Wu Qiang Peng Xiang Sun Jia Meng Yao Shuai

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Effects of far-field boundary conditions on the simulation of hydrate production

Environmental Geotechnics (2020)

Yi Zhang Hao Luo Haizuo Zhou Qi He Tao Feng

The world’s first offshore methane hydrate extraction was conducted in 2013 at the Daini-Atsumi Knoll located in the eastern Nankai Trough. The results indicated that the gas production rate of a single vertical well cannot meet the requirement for commercialisation of methane hydrate production. Therefore, a trial multi-well system has been considered for future hydrate production. Understanding the ‘influence distance’ of extraction wells within methane hydrate turbidite reservoir formations, such as that of the Nankai Trough, is significant to the design of the proposed multi-well system. In this study, the boundary effects are examined for cases involving different values of permeability and initial hydrate saturation for the modelled turbidite formations. A relationship is proposed to predict the longest simulation time for a given set of lengths and parameters. The two concepts of critical production time (CPT) and turbidity/homogeneity coefficient ratio (THCR) are introduced to analyse the interaction between the effects of model size and heterogeneities. It is found that the CPT can be normalised by the radius of the model; the THCR is affected by the relative thickness of the sand and clay layers.

Saturation (graph theory)

Clathrate hydrate

Relative permeability

10.1680/jenge.19.00063

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Citations (2)

Mechanical Behaviors of Hydrate-bearing Sediment with Different Cementation Spatial Distributions at Microscales

Zenodo (CERN European Organization for Nuclear Research) (2021)

Yanghui Li Peng Wu Xiang Sun Weiguo Liu Yongchen Song

Supplemental Information Table S1. Datasets related to the pore space radii distribution in Figure 1. Table S2. Datasets related to the stress-strain relationship in Figure 2. Table S3. Datasets related to the hydrate particle number and average size evolution in Figure 5. Table S4. Datasets related to the PNM parameter evolution in Figure 7. Table S5. Datasets related to the hydrate-sand interfacial area evolution in Figure 8. Movie S1. Movie related to the deformation process of the specimen #O-1. Movie S2. Movie related to the deformation process of the specimen #O-2.

Cementation (geology)

10.5281/zenodo.4646784

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Aggregation Behavior of Asphalt on the Natural Gas Hydrate Surface with Different Surfactant Coverages

The Journal of Physical Chemistry C (2021)

Zherui Chen Yanghui Li Cong Chen Xiang Sun Weiguo Liu

The aggregation behaviors of asphalt on the hydrate surface with different surfactant coverages were studied by molecular simulations. The molecular polarity index of asphalt (10.47 kcal/mol) is higher than that of Span 80 (8.19 kcal/mol). Asphalt is easier to occupy the binding sites between Span 80 and hydrate. Asphalt mainly depends on the π–π interaction to form aggregates. The dispersion interaction up to −114.17 kcal/mol is the main factor to maintain the asphalt aggregate stability. With the increase of surfactant coverage, the polar groups of asphalt are easier to associate with each other, promoting the formation of larger asphalt self-aggregates. The self-aggregation increases the complexity of asphalt stacking, and the proportion of edge-to-face stacking types increases from 40 to 60%. When the Span 80 molecule number reaches 12, the diffusion coefficient of asphalt is only (2.31 ± 0.5) × 10–8 cm2/s. Asphalt with low diffusivity can provide new sites for hydrate nucleation. The results are helpful to understand the aggregation mechanism of asphalt on the hydrate surface. Increasing the concentration of surfactant only is not a good solution to solve blocking-pipeline problems. We need to use surfactant reasonably and give full play to the anti-agglomerant effect of asphalt itself.

Clathrate hydrate

10.1021/acs.jpcc.1c01747

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Citations (39)

A microfocus x-ray computed tomography based gas hydrate triaxial testing apparatus

Review of Scientific Instruments (2019)

Yanghui Li Peng Wu Weiguo Liu Xiang Sun Zhi Wei Cui

Gas hydrate-bearing sediment shows complex mechanical characteristics. Its macroscopic deformation process involves many microstructural changes such as phase transformation, grain transport, and cementation failure. However, the conventional gas hydrate triaxial testing apparatus is not possible to obtain the microstructure in the samples. In this study, a novel, low-temperature (-35 to 20 °C), high-pressure (>16 MPa confining pressure and >95.4 MPa vertical stress) triaxial testing apparatus suitable for X-ray computed tomography scanning is developed. The new apparatus permits time-lapse imaging to capture the role of hydrate saturation, effective stress, strain rate, hydrate decomposition on hydrate-bearing sediment characteristic, and cementation failure behavior. The apparatus capabilities are demonstrated using in situ generation of hydrate on a xenon hydrate-bearing glass bead sample. In the mentioned case, a consolidated drained shear test was conducted, and the imaging reveals hydrate occurrence with a saturation of 37.3% as well as the evolution of localized strain (or shear band) and cementation failure along with axial strain.

Cementation (geology)

Saturation (graph theory)

Clathrate hydrate

10.1063/1.5095812

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Citations (97)