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泥质低渗水合物降压开采特性与模型研究

化工学报 2024年第8期75卷 2909-2916,F0003页

作者：杨明军巩广军郑嘉男宋永臣大连理工大学海洋能源利用与节能教育部重点实验室辽宁大连116024 浙江大学上海高等研究院上海201203

天然气水合物(又名可燃冰)是海底储层常见的一种非常规浅层气藏,具备泥质、低渗等特点,实现其安全高效开发具有重要现实意义。在水合物开采过程中,气体渗流及水合物分解行为都会发生动态变化,两者的复杂耦合作用决定了水合物储层的产气... 详细信息

天然气水合物(又名可燃冰)是海底储层常见的一种非常规浅层气藏,具备泥质、低渗等特点,实现其安全高效开发具有重要现实意义。在水合物开采过程中,气体渗流及水合物分解行为都会发生动态变化,两者的复杂耦合作用决定了水合物储层的产气效率,但目前缺乏对其动态耦合预测模型的研究。因此,需要进一步分析天然气水合物储层降压开采过程中气体渗流与水合物分解行为。使用南海土在岩心夹持器内重塑了泥质低渗的水合物储层,探明了降压开采特性以及储层压力的影响,并创新性提出包含储层压力、水合物分解以及产气流量等关键指标的水合物降压开采预测模型,实现了泥质低渗水合物储层渗流与分解时空关联与高精度预测,相关系数(R2)均为99%以上。本结果可为实地优化调控降压开采水合物提供理论指导。

关键词：天然气水合物低渗岩心相变模型多孔介质降压开采

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CO_(2)-海水水合物生成强化方法研究

化工学报 2024年第8期75卷 2939-2948页

作者：杨明军宋维张磊凌铮陈兵兵宋永臣大连理工大学能源与动力学院辽宁大连116081

海水中的盐离子成分阻碍水合物成核进程,使得水合物法海洋碳封存耗时长、封存比率低。结合水合物非均相成核特征考虑,认为在局部区域内实现水合物优先成核,进而带动大片海域内水合物扩展生成的封存方法极具工业可行性。因而,开展海水水... 详细信息

海水中的盐离子成分阻碍水合物成核进程,使得水合物法海洋碳封存耗时长、封存比率低。结合水合物非均相成核特征考虑,认为在局部区域内实现水合物优先成核,进而带动大片海域内水合物扩展生成的封存方法极具工业可行性。因而,开展海水水合物强化生成方法基础研究是推进水合物法海洋碳封存应用落地的基础。基于此,以高效、高转化率生成水合物为目标,在实验室尺度分别探究了高过冷度、添加剂四丁基溴化铵(TBAB)以及变温速率对海水水合物生成特性的影响。结果表明,受到盐离子抑制作用,400 m深度海水中水合物自然生成难度极大,而提高生成过程的过冷度可增强水合物生成驱动力;热力学添加剂TBAB难以显著改善海水水合物的生成条件,但可使生成速率有所提高;0.3 K/min降温速率下的水合物转化率分别是过冷度作用和添加剂作用下的1.28倍和1.19倍。在后续研究中,应考虑多种强化生成方法的耦合作用效果,开发更能缓解海水水合物生成难题的技术手段。

关键词：二氧化碳水合物成核相平衡

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Dissociation characteristics of methane hydrate using depressurization combined with thermal stimulation

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2089-2098页

作者： mingjun yang Zhanquan Ma Yi Gao Lanlan Jiang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology

Methane hydrate is considered as a potential energy source in the future due to its abundant reserves and high energy *** investigate the influence of initial hydrate saturation,production pressure,and the temperature of thermal stimulation on gas production rate and cumulative gas production percentage,we conducted the methane hydrate dissociation experiments using depressurization,thermal stimulation and a combination of two methods in this *** is found that when the gas production pressures are the same,the higher the hydrate initial saturation,the greater change in hydrate reservoir ***,it is easier to appear the phenomenon of icing and hydrate reformation when the hydrate saturation is *** example,the reservoir temperature dropped to below zero in depressurization process when the hydrate saturation was about 37%.However,the same phenomenon didn’t appear as the saturation was about 12%.This may be due to more free gas in the reservoir with hydrate saturated of 37%.We also find that the temperature variation of reservoir can be reduced effectively by combination of depressurization and thermal stimulation *** the average gas production rate is highest with combined method in the *** the pressure of gas production is 2 MPa,compared with depressurization,the average of gas production can increase 54%when the combined method is *** efficiency of gas production is very low when thermal stimulation was used *** the temperature of thermal stimulation is 11℃,the average rate of gas production in the experiment of thermal stimulation is less than 1/3 of that in the experiment of the combined method.

关键词： Methane hydrate Depressurization Thermal stimulation Dissociation characteristics

An improved model for predicting hydrate phase equilibrium in marine sediment environment

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Journal of Natural Gas Chemistry 2010年第3期19卷 241-245页

作者： Yongchen Song mingjun yang Yongjun Chen Qingping Li Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian 116024 Liaoning China CNOOC Research Center Beijing 100027 China

Based on the models of hydrate phase equilibrium in bulk water and porous media,an improved model was proposed to predict the methane hydrate equilibrium in marine sediment *** the suggested model,mechanical equilibrium of force between the interfaces in hydrate-liquid-vapor system was *** electrolyte was present in pore water,interfacial energy between hydrate and liquid was corrected by an equation that is expressed as the function of temperature and electrolyte *** activity of water is calculated based on the Pitzer model and the interfacial energy between liquid and gas is solved using the Li *** prediction results show good agreement with the experimental *** comparison with other models,it is proved that this model can improve the accuracy for predicting hydrate phase equilibrium in marine sediment environment.

关键词： hydrate equilibrium interfacial energy marine sediment

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二阶无规相近似对原子核集体激发态的研究

原子核物理评论 2024年第1期41卷 214-220页

作者：杨明军张春雷白春林张焕乔四川大学物理学院成都610065 北京师范大学核科学与技术学院北京100875 中国原子能科学研究院北京102413

原子核的集体激发态是原子核在坐标、自旋和同位旋等空间的共振产生。研究这些激发态可以获取原子核结构性质以及内部核子-核子相互作用的信息,此外还能为天体核物理提供重要的输入量。基于Skyrme密度泛函的自洽二阶无规相近似(SRPA)理... 详细信息

原子核的集体激发态是原子核在坐标、自旋和同位旋等空间的共振产生。研究这些激发态可以获取原子核结构性质以及内部核子-核子相互作用的信息,此外还能为天体核物理提供重要的输入量。基于Skyrme密度泛函的自洽二阶无规相近似(SRPA)理论被用于研究闭壳原子核的这些集体激发态,包括无电荷交换的正常宇称态0^(+)、2^(+)、3^(-),以及电荷交换的伽莫夫-泰勒(GT)跃迁。此外,两粒子-两空穴组态下的张量力效应被突出讨论,研究指出它能产生低能正常跃迁或者提高它们的跃迁强度,另外加入张量力后能系统地描述一系列闭壳核的GT巨共振的强度和激发能,并自洽地描述不稳定闭壳或准闭壳核的β衰变半衰期。

关键词：正常宇称态伽莫夫-泰勒跃迁 β衰变张量力二阶无规相近似

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天然气水合物降压开采相变的热力学特性研究

工程热物理学报 2024年第9期45卷 2580-2585页

作者：田梦茹董爽李静杨明军宋永臣郑嘉男大连理工大学海洋能源利用与节能教育部重点实验室大连116024 浙江大学上海高等研究院上海201203

天然气水合物开发是国家重大战略需求,距离其商业化开发还需要进一步提产增效,如何实现天然气水合物高效开采需要依托于水合物热力学机制。传统水合物热力学研究局限于相平衡特性,缺乏水合物分解过程非平衡热力学角度的考量,同时水合物... 详细信息

天然气水合物开发是国家重大战略需求,距离其商业化开发还需要进一步提产增效,如何实现天然气水合物高效开采需要依托于水合物热力学机制。传统水合物热力学研究局限于相平衡特性,缺乏水合物分解过程非平衡热力学角度的考量,同时水合物分解过程中可能伴随结冰和融冰,复杂传热和传质条件下水合物开采过程的热力学特性亟待阐明。本研究利用一套2 L的天然气水合物降压开采实验系统,模拟不同分布的水合物储层,在0.55 L/min(标准工况)的恒定排气速率下开展长降压(至1.0 MPa)过程水合物开采研究,结果表明降压过程中水合物区域温度与压力之间存在着只受水合物分解控制的非平衡热力学关系(T[℃]=8533.8/{38.98-ln(1000p[MPa])}-275.25),并且不受储层温度梯度影响。吉布斯相律表明相变过程热力学自由度为1,天然气水合物开采属于相变过程,其温度压力的定量关系吻合热力学理论。当水合物降压到2.1~2.3 MPa左右时,储层内出现瞬时结冰,导致温度突增并加速水合物分解,由于排气速率恒定,聚集的气体使压力最高上升到2.36 MPa,分析发现结冰前后水合物储层温度和压力仍满足水合物的非平衡热力学相图。本研究阐明了天然气水合物开采过程热质传递作用存在条件下相变热力学机制,能够为开采现场监测进程提供更为实用的理论依据。

关键词：天然气水合物相变过程水合物分解冰非平衡热力学

Numerical studies of hydrate dissociation and gas production behavior in porous media during depressurization process

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Journal of Natural Gas Chemistry 2012年第4期21卷 381-392页

作者： Xuke Ruan mingjun yang Yongchen Song Haifeng Liang yanghui Li Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116023LiaoningChina College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

In this study, a numerical model is developed to investigate the hydrate dissociation and gas production in porous media by depressurization. A series of simulation runs are conducted to study the impacts of permeability characteristics, including permeability reduction exponent, absolute permeability, hydrate accumulation habits and hydrate saturation, sand average grain size and irreducible water saturation. The effects of the distribution of hydrate in porous media are examined by adapting conceptual models of hydrate accumulation habits into simulations to govern the evolution of permeability with hydrate decomposition, which is also compared with the conventional reservoir permeability model, i.e. Corey model. The simulations show that the hydrate dissociation rate increases with the decrease of permeability reduction exponent, hydrate saturation and the sand average grain size. Compared with the conceptual models of hydrate accumulation habits, our simulations indicate that Corey model overpredicts the gas production and the performance of hydrate coating models is superior to that of hydrate filling models in gas production, which behavior does follow by the order of capillary coating〉pore coating〉pore filling〉capillary filling. From the analysis of tl/2, some interesting results are suggested as follows：（1） there is a ＂switch＂ value （the ＂switch＂ absolute permeability） for laboratory-scale hydrate dissociation in porous media, the absolute permeability has almost no influence on the gas production behavior when the permeability exceeds the ＂switch＂ value. In this study, the ＂switch＂ value of absolute permeability can be estimated to be between 10 and 50 md. （2） An optimum value of initial effective water saturation Sw,e exists where hydrate dissociation rate reaches the maximum and the optimum value largely coincides with the value of irreducible water saturation Swr,e. For the case of Sw,e〈,Swr,e, or Sw,e〉Swr,e, there are different control mechanisms domin

关键词： gas hydrate numerical simulation permeability dissociation gas production depressurization

Progress and trends in hydrate based desalination(HBD) technology:A review

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2037-2043页

作者： Jianan Zheng Fanbao Cheng Yuanping Li Xin Lü mingjun yang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116024China Institute of Science and Technology Shenzhen BranchChina National Offshore Oil CorporationGuangzhou 510420China CNOOC Research Institute Co.Ltd. Beijing 100027China

The shortage of freshwater boosts the development of seawater desalination technology. As a novel method, the hydrate based desalination technology has been put forward for decades and achieved considerable development in the past years. This review focuses on the experimental progress at the aspects of the hydrate former choice, formation promotion and ion removal efficiency and conceptive innovation of hydrate separation and energy utilization. It should be noted that gaseous hydrate former with low formation pressure and insoluble liquid hydrate former are worthy for further study. Besides, the water migration caused by propane deserves to be investigated much more deeply for the potential value of wide application. Moreover, the utilization proposal of LNG cold energy brings more possibility of commercial application. In a word, the hydrate based desalination technology is hopefully an environment friendly, low-cost and widely used desalination technology in the near future.

关键词： Gas hydrate Desalination Separation Phase equilibria Hydrocarbons Mixture

Study of the permeability characteristics of porous media with methane hydrate by pore network model

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Journal of Natural Gas Chemistry 2010年第3期19卷 255-260页

作者： Haifeng Liang Yongchen Song Yu Liu mingjun yang Xing Huang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian 116024 Liaoning China

The permeability in the methane hydrate reservoir is one of the key parameters in estimating the gas production performance and the flow behavior of gas and water during *** this paper,a three-dimensional cubic pore-network model based on invasion percolation is developed to study the effect of hydrate particle formation and growth habit on the *** variation of permeability in porous media with different hydrate saturation is studied by solving the network *** simulation results are well consistent with the experimental *** proposed model predicts that the permeability will reduce exponentially with the increase of hydrate saturation,which is crucial in developing a deeper understanding of the mechanism of hydrate formation and dissociation in porous media.

关键词： pore network model hydrate saturation permeability porous media