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Latest progress in numerical simulations on multiphase flow and thermodynamics in production of naturalgas from gas hydrate reservoir

Lin ZUO, Lixia SUN, Changfu YOU

《能源前沿（英文）》 2009年第3卷第2期页码 152-159 doi: 10.1007/s11708-009-0017-x

摘要： Natural gas hydrates are promising potential alternative energy resources. Some studies on the multiphase flow and thermodynamics have been conducted to investigate the feasibility of gas production from hydrate dissociation. The methods for natural gas production are analyzed and several models describing the dissociation process are listed and compared. Two prevailing models, one for depressurization and the other for thermal stimulation, are discussed in detail. A comprehensive numerical method considering the multiphase flow and thermodynamics of gas production from various hydrate-bearing reservoirs is required to better understand the dissociation process of natural gas hydrate, which would be of great benefit to its future exploration and exploitation.

关键词： numerical simulation natural gas hydrate dissociation thermodynamics multiphase flow

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Key issues in development of offshore natural gas hydrate

Shouwei ZHOU, Qingping LI, Xin LV, Qiang FU, Junlong ZHU

《能源前沿（英文）》 2020年第14卷第3期页码 433-442 doi: 10.1007/s11708-020-0684-1

摘要： As a new clean energy resource in the 21st century, natural gas hydrate is considered as one of the most promising strategic resources in the future. This paper, based on the research progress in exploitation of natural gas hydrate (NGH) in China and the world, systematically reviewed and discussed the key issues in development of natural gas hydrate. From an exploitation point of view, it is recommended that the concepts of diagenetic hydrate and non-diagenetic hydrate be introduced. The main factors to be considered are whether diagenesis, stability of rock skeleton structure, particle size and cementation mode, thus NGHs are divided into 6 levels and used unused exploitation methods according to different types. The study of the description and quantitative characterization of abundance in hydrate enrichment zone, and looking for gas hydrate dessert areas with commercial exploitation value should be enhanced. The concept of dynamic permeability and characterization of the permeability of NGH by time-varying equations should be established. The ‘Three-gas co-production’ (natural gas hydrate, shallow gas, and conventional gas) may be an effective way to achieve early commercial exploitation. Although great progress has been made in the exploitation of natural gas hydrate, there still exist enormous challenges in basic theory research, production methods, and equipment and operation modes. Only through hard and persistent exploration and innovation can natural gas hydrate be truly commercially developed on a large scale and contribute to sustainable energy supply.

关键词： natural gas hydrate exploitation offshore diagenetic and non-diagenetic hydrate solid-state fluidization method dessert in enrichment area three-gas combined production on gas hydrate abundance

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Progress in use of surfactant in nearly static conditions in natural gas hydrate formation

Zhen PAN, Yi WU, Liyan SHANG, Li ZHOU, Zhien ZHANG

《能源前沿（英文）》 2020年第14卷第3期页码 463-481 doi: 10.1007/s11708-020-0675-2

摘要： Natural gas hydrate is an alternative energy source with a great potential for development. The addition of surfactants has been found to have practical implications on the acceleration of hydrate formation in the industrial sector. In this paper, the mechanisms of different surfactants that have been reported to promote hydrate formation are summarized. Besides, the factors influencing surfactant-promoted hydrate formation, including the type, concentration, and structure of the surfactant, are also described. Moreover, the effects of surfactants on the formation of hydrate in pure water, brine, porous media, and systems containing multiple surfactants are discussed. The synergistic or inhibitory effects of the combinations of these additives are also analyzed. Furthermore, the process of establishing kinetic and thermodynamic models to simulate the factors affecting the formation of hydrate in surfactant-containing solutions is illustrated and summarized.

关键词： gas hydrate kinetic hydrate promoter compounding model surfactant mechanism

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Analysis of physical properties of gas hydrate-bearing unconsolidated sediment samples from the ultra-deepwater

《能源前沿（英文）》 2022年第16卷第3期页码 509-520 doi: 10.1007/s11708-021-0786-4

摘要： Marine natural gas hydrate has recently attracted global attention as a potential new clean energy source. Laboratory measurements of various physical properties of gas hydrate-bearing marine sediments can provide valuable information for developing efficient and safe extraction technology of natural gas hydrates. This study presents comprehensive measurement results and analysis of drilled hydrate-bearing sediments samples recovered from Qiongdongnan Basin in the South China Sea. The results show that the gas hydrate in the core samples is mainly methane hydrate with a methane content of approximately 95%, and the other components are ethane and carbon dioxide. The saturation of the samples fluctuates from 2%–60%, the porosity is approximately 38%–43%, and the water content is approximately 30%–50%, which indicate that high water saturation means that timely drainage should be paid attention to during hydrate extraction. In addition, the median diameter of the sediment samples is mainly distributed in the range of 15 to 34 μm, and attention should be paid to the prevention and control of sand production in the mining process. Moreover, the thermal conductivity is distributed in the range of 0.75 to 0.96 W/(m∙K) as measured by the flat plate heat source method. The relatively low thermal conductivity of hydrates at this study site indicates that a combined approach is encouraged for natural gas production technologies. It is also found that clay flakes and fine particles are attached to the surface of large particles in large numbers. Such characteristics will lead to insufficient permeability during the production process.

关键词： natural gas hydrates physical properties analysis hydrate-bearing sediments

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Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea

Xin LYU, Qingping LI, Yang GE, Junlong ZHU, Shouwei ZHOU, Qiang FU

《能源前沿（英文）》 2021年第15卷第2期页码 367-373 doi: 10.1007/s11708-020-0714-z

摘要： The basic physical properties of marine natural gas hydrate deposits are important to the understanding of seabed growth conditions, occurrence regularity, and occurrence environment of natural gas hydrates. A comprehensive analysis of the core samples of drilling pressure-holding hydrate deposits at a depth of 1310 m in the Shenhu area of the South China Sea was conducted. The experimental results indicate that the particle size in the hydrate sediment samples are mainly distributed in the range from 7.81 µm to 21.72µm, and the average particle size decreases as the depth of the burial increases. The X-ray CT analytical images and surface characteristics SEM scan images suggest that the sediment is mostly silty clay. There are a large number of bioplastics in the sediment, and the crack inside the core may be areas of hydrate formation.

关键词： natural gas hydrate Shenhu area reservoirs characteristics

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天然气水合物资源勘探与试采技术研究现状与发展战略

付强,周守为,李清平

《中国工程科学》 2015年第17卷第9期页码 123-132

摘要：

天然气水合物是甲烷等烃类气体与水在高压低温条件下形成的笼形化合物，俗称可燃冰，将有望成为继页岩气、致密气、煤层气、油砂等之后的储量最为巨大的接替能源，主要分布在北极冻土带和沿海大陆架300~3000 m水深的深水区，初步估计其资源量为全球含碳化合物的两倍，其中约95 %储存在深海区域；与此同时，深水浅层弱胶结水合物的无序分解等潜在工程地质灾害、温室效应等也已引起世界各国的高度重视，因此，天然气水合物资源安全高效开发和环境风险并重，成为当前世界科技创新的前沿。本文回顾了国内外天然气水合物资源勘探和试采技术研究进展，在此基础上，针对我国海域潜在目标区以及我国已经获取的天然气水合物样品的相关特性，提出了我国天然气水合物资源勘探开发技术方向。

关键词：天然气水合物；勘探与试采；储量巨大；研究现状；发展战略

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海洋天然气水合物开采技术与装备发展研究

付强,王国荣,周守为,钟林,王雷振

《中国工程科学》 2020年第22卷第6期页码 32-39 doi: 10.15302/J-SSCAE-2020.06.005

摘要：

天然气水合物尤其是海洋天然气水合物是有望替代传统化石能源的一种新型清洁非常规能源，全球储量丰富，目前对其开采仍处于研究阶段，商业化、规模化开采面临诸多技术与装备挑战。本文针对现有水合物开采方法，围绕日本和我国的海洋天然气试采工程案例，对降压和固态流化法两种试采模式涉及的关键技术和工艺进行了分析；综合国内外相关技术与装备的发展现状，提出了适合我国储层与装备技术的海洋天然气水合物开采的发展思路及对策建议。研究发现，在以深海采矿车、疏松浅表层双梯度钻井技术等为代表，用于水合物 – 油气 – 海底金属矿开采的通用关键技术装备领域，我国的整体水平落后于国外；在以防砂技术装备、浅层水合物开采的预斜导向钻进技术、“三气合采”技术装备等为代表的专用关键技术装备领域，我国综合水平与国际先进水平相当，但仍然距商业化开采技术装备需求较远。面向 2035 年，我国海洋天然气水合物开采技术与装备发展的战略目标为进入全面领跑阶段，建立商业化开发的工程装备体系。研究建议，从国家层面制定海洋天然气水合物开发技术与装备研发计划，推动水合物的商业化开发进程，开展海洋非成岩水合物开采专用和通用技术装备的研发及应用。

关键词：海洋天然气水合物开采模式通用技术装备专用技术装备

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海洋天然气水合物藏开采若干问题研究

白玉湖,李清平

《中国工程科学》 2011年第13卷第5期页码 103-112

摘要：

文章阐述了在开采天然气水合物方面所取得的研究进展，包括天然气水合物开采模型及数值模拟，天然气水合物开采物理模拟相似准则，天然气水合物开采方法研究等。建立、完善了天然气水合物开采的数学模型，并以此为基础建立了降压开采水合物物理模拟相似准则。降压法开采单一水合物藏，在某些情况下开采能量不足会导致藏内结冰严重。对下伏气的天然气水合物藏而言，水合物能够提高产气量、延长稳产时间。结合降压和注热的优势提出了注温水-降压法联合开采方法，该方法具有稳产时间较长、稳产气速度高的特点。

关键词：天然气水合物降压法注温水-降压联合开采方法数学模型相似准则

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天然气水合物开采技术研究现状与展望

李清平,周守为,赵佳飞,宋永臣,朱军龙

《中国工程科学》 2022年第24卷第3期页码 214-224 doi: 10.15302/J-SSCAE-2022.03.022

摘要：

天然气水合物是一种世界公认的最具潜力的清洁能源，目前我国对水合物的勘探开采研究正进入关键突破阶段，南海泥质粉砂天然气水合物成藏机理与赋存规律尚不明晰，开采过程水合物分解相变机制与安全、高效技术仍需进一步探明。本文重点介绍了包括降压开采、固态流化开采等在内的天然气水合物开采技术的研究与应用现状，并通过分析天然气水合物开采技术存在的问题给出了相应的发展建议。研究建议，推动天然气水合物、深部油气等多气源立体开采基础研究和重大工程；强化技术融合，推进理论与实践协同并进；推进天然气水合物中试尺度实验和多场耦合的数值模拟大科学平台建设；建立健全天然气水合物的相关标准等措施，以提升我国天然气水合物开采技术的研发水平和技术成熟度，以期早日实现天然气水合物的大规模商业化开发，服务于我国的能源安全战略。

关键词：天然气水合物；开采技术；降压；固态流化；联合方法

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Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas

Solomon A. Aromada, Bjørn Kvamme

《化学科学与工程前沿（英文）》 2019年第13卷第3期页码 616-627 doi: 10.1007/s11705-019-1795-2

摘要： Evaluation of maximum content of water in natural gas before water condenses out at a given temperature and pressure is the initial step in hydrate risk analysis during pipeline transport of natural gas. The impacts of CO and H S in natural gas on the maximum mole-fractions of water that can be tolerated during pipeline transport without the risk of hydrate nucleation has been studied using our novel thermodynamic scheme. Troll gas from the North Sea is used as a reference case, it contains very negligible amount of CO and no H S. Varying mole-fractions of CO and H S were introduced into the Troll gas, and the effects these inorganic impurities on the water tolerance of the system were evaluated. It is observed that CO does not cause any distinguishable impact on water tolerance of the system, but H S does. Water tolerance decreases with increase in concentration of H S. The impact of ethane on the system was also investigated. The maximum mole-fraction of water permitted in the gas to ensure prevention of hydrate formation also decreases with increase in the concentration of C H like H S. H S has the most impact, it tolerates the least amount of water among the components studied.

关键词： hydrate hydrogen Sulphide CO₂ dew point pipeline

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天然气水合物——未来的新能源

金庆焕

《中国工程科学》 2000年第2卷第11期页码 29-34

摘要：

现有资料表明，全球石油和天然气的后备资源还能维持40余年，因此科技专家将天然气水合物列为未来的新能源。在世界各海域目前已发现天然气水合物矿区82处，据地质学家估算，各海区天然气水合物中甲烷的碳总量是全球所有石油、天然气和煤的碳总量的2倍。

广州海洋地质局对南海北部陆坡区开展了天然气水合物的调査，高分辨率地震调査资料显示，在南海北部陆坡区存在天然气水合物明显的地球物理标志。

关键词：天然气水合物新能源南海北部陆坡

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Research on the theory and application of adsorbed natural gas used in new energy vehicles: A review

Zhengwei NIE,Yuyi LIN,Xiaoyi JIN

《机械工程前沿（英文）》 2016年第11卷第3期页码 258-274 doi: 10.1007/s11465-016-0381-2

摘要：

Natural gas, whose primary constituent is methane, has been considered a convincing alternative for the growth of the energy supply worldwide. Adsorbed natural gas (ANG), the most promising methane storage method, has been an active field of study in the past two decades. ANG constitutes a safe and low-cost way to store methane for natural gas vehicles at an acceptable energy density while working at substantially low pressures (3.5–4.0 MPa), allowing for conformable store tank. This work serves to review the state-of-the-art development reported in the scientific literature on adsorbents, adsorption theories, ANG conformable tanks, and related technologies on ANG vehicles. Patent literature has also been searched and discussed. The review aims at illustrating both achievements and problems of the ANG technologies-based vehicles, as well as forecasting the development trends and critical issues to be resolved of these technologies.

关键词： adsorbed natural gas (ANG) adsorbent adsorption theory conformable tank natural gas vehicles (NGVs)

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A novel methodology for forecasting gas supply reliability of natural gas pipeline systems

Feng CHEN, Changchun WU

《能源前沿（英文）》 2020年第14卷第2期页码 213-223 doi: 10.1007/s11708-020-0672-5

摘要： In this paper, a novel systematic and integrated methodology to assess gas supply reliability is proposed based on the Monte Carlo method, statistical analysis, mathematical-probabilistic analysis, and hydraulic simulation. The method proposed has two stages. In the first stage, typical scenarios are determined. In the second stage, hydraulic simulation is conducted to calculate the flow rate in each typical scenario. The result of the gas pipeline system calculated is the average gas supply reliability in each typical scenario. To verify the feasibility, the method proposed is applied for a real natural gas pipelines network system. The comparison of the results calculated and the actual gas supply reliability based on the filed data in the evaluation period suggests the assessment results of the method proposed agree well with the filed data. Besides, the effect of different components on gas supply reliability is investigated, and the most critical component is identified. For example, the 48th unit is the most critical component for the SH terminal station, while the 119th typical scenario results in the most severe consequence which causes the loss of 175.61×10 m gas when the 119th scenario happens. This paper provides a set of scientific and reasonable gas supply reliability indexes which can evaluate the gas supply reliability from two dimensions of quantity and time.

关键词： natural gas pipeline system gas supply reliability evaluation index Monte Carlo method hydraulic simulation

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Progress and prospect of hydrate-based desalination technology

Jibao ZHANG, Shujun CHEN, Ning MAO, Tianbiao HE

《能源前沿（英文）》 2022年第16卷第3期页码 445-459 doi: 10.1007/s11708-021-0740-5

摘要： With the continuous growth of the population and the improvement of production, the shortage of freshwater has plagued many countries. The use of novel technologies such as desalination to produce fresh water on a large scale has become inevitable in the world. Hydrate-based desalination (HBD) technology has drawn an increasing amount of attention due to its mild operation condition and environmental friendliness. In this paper, literature on hydrate-based desalination is comprehensively analyzed and critically evaluated, focuses on experimental progress in different hydrate formers that have an impact on thermodynamics and dynamics in hydrate formation. Besides, various porous media promotion is investigated. Besides, the hydrate formation morphology and hydrate crystal structure with different hydrate formers are analyzed and compared. Moreover, molecular dynamic simulation is discussed to further understand microscopic information of hydrate formation. Furthermore, simulations of the HBD process by considering the energy consumption are also investigated. In conclusion, the hydrated based desalination is a potential technology to get fresh water in a sustainable way.

关键词： gas hydrates desalination crystal morphology molecular dynamic cold energy

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A review on technologies with electricity generation potentials using liquified natural gas regasification

《能源前沿（英文）》 2023年第17卷第3期页码 332-379 doi: 10.1007/s11708-023-0863-y

摘要： In modern times, worldwide requirements to curb greenhouse gas emissions, and increment in energy demand due to the progress of humanity, have become a serious concern. In such scenarios, the effective and efficient utilization of the liquified natural gas (LNG) regasification cold energy (RCE), in the economically and environmentally viable methods, could present a great opportunity in tackling the core issues related to global warming across the world. In this paper, the technologies that are widely used to harness the LNG RCE for electrical power have been reviewed. The systems incorporating, the Rankine cycles, Stirling engines, Kalina cycles, Brayton cycles, Allam cycles, and fuel cells have been considered. Additionally, the economic and environmental studies apart from the thermal studies have also been reviewed. Moreover, the discussion regarding the systems with respect to the regassification pressure of the LNG has also been provided. The aim of this paper is to provide guidelines for the prospective researchers and policy makers in their decision making.

关键词： liquified natural gas cold energy power generation