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Optimization of Gas Production from Hydrate-Bearing Sediments with Fluctuation Characteristics

Journal of Ocean University of China 2024年第3期23卷 618-632页

作者： LI Yaobin XU Tianfu XIN Xin YU Han YUAN Yilong zhu huixing Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun 130021China

As an important source of low-carbon,clean fossil energy,natural gas hydrate plays an important role in improving the global energy consumption structure.Developing the hydrate industry in the South China Sea is important to achieving‘carbon peak and carbon neutrality’goals as soon as possible.Deep-water areas subjected to the action of long-term stress and tectonic movement have developed complex and volatile terrains,and as such,the morphologies of hydrate-bearing sediments(HBSs)fluctuate correspondingly.The key to numerically simulating HBS morphologies is the establishment of the conceptual model,which represents the objective and real description of the actual geological body.However,current numerical simulation models have characterized HBSs into horizontal strata without considering the fluctuation characteristics.Simply representing the HBS as a horizontal element reduces simulation accuracy.Therefore,the commonly used horizontal HBS model and a model considering the HBS’s fluctuation characteristics with the data of the SH2 site in the Shenhu Sea area were first constructed in this paper.Then,their production behaviors were compared,and the huge impact of the fluctuation characteristics on HBS production was determined.On this basis,the key parameters affecting the depressurization production of the fluctuating HBSs were studied and optimized.The research results show that the fluctuation characteristics have an obvious influence on the hydrate production of HBSs by affecting their temperatures and pressure distributions,as well as the transmission of the pressure drop and methane gas discharge.Furthermore,the results show that the gas productivity of fluctuating HBSs was about 5%less than that of horizontal HBSs.By optimizing the depressurization amplitude,well length,and layout location of vertical wells,the productivity of fluctuating HBSs increased by about 56.6%.

关键词： natural gas hydrate numerical simulation fluctuation characteristics depressurization production production well optimization

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Numerical Simulation of Thermo-Hydro-Mechanical-Chemical Response Caused by CO_(2)Injection into Saline Geological Formations:A Case Study from the Ordos Project,China

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 889-910页

作者： FAN Zejin XU Tianfu YANG Bo ZHANG Hui zhu huixing Key Laboratory of Groundwater Resources and the Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and the Environment Jilin UniversityChangchun 130021China

Thermo-hydro-mechanical-chemical(THMC)interactions are prevalent during CO_(2)geological sequestration(CGS).In this study,a sequential coupling THMC numerical simulation program was constructed,which can be used to explore the following issues of CGS:fluid and heat flow,solute transport;stresses,displacements and rock failures related to geo-mechanical effects;equilibrium and kinetic chemical reactions;chemical damage to mechanical properties of the rock.Then,the coupling program was applied to the Ordos CGS Project to study the formation response under the multifield interaction caused by CO_(2)injection.The simulation results show that the mechanical process dominates the short CO_(2)injection period.Specifically,the formation’s permeability near the injection well increases by 43%,due to the reduction of effective stress,which significantly promotes the lateral migration of CO_(2).When the injection rate exceeds 0.15 million tons per year,the cohesion of the reservoir rock is not enough to resist the shear force inside the rock and rock failure may occur.During the subsequent long-term sequestration period(200 years),the influence of mineral reactions gradually increases.Due to calcite dissolution,the shear modulus of caprock is predicted to decrease by 7.6%,which will to some extent increase the risk of rock failure.

关键词： CO_(2) geological sequestration THMC coupling numerical simulation chemical damage

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Sensitivity Analysis of Multi-phase Seepage Parameters Affecting the Clayey Silt Hydrate Reservoir Productivity in the Shenhu Area,South China Sea

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Acta Geologica Sinica(English Edition) 2023年第6期97卷 1787-1800页

作者： LI Yaobin XU Tianfu XIN Xin ZANG Yingqi zhu huixing YUAN Yilong Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China

Natural gas hydrate(NGH)is an important future resource for the 21st century and a strategic resource with potential for commercial development in the third energy transition.It is of great significance to accurately predict the productivity of hydrate-bearing sediments(HBS).The multi-phase seepage parameters of HBS include permeability,porosity,which is closely related to permeability,and hydrate saturation,which has a direct impact on hydrate content.Existing research has shown that these multi-phase seepage parameters have a great impact on HBS productivity.Permeability directly affects the transmission of pressure-drop and discharge of methane gas,porosity and initial hydrate saturation affect the amount of hydrate decomposition and transmission process of pressure-drop,and also indirectly affect temperature variation of the reservoir.Considering the spatial heterogeneity of multi-phase seepage parameters,a depressurization production model with layered heterogeneity is established based on the clayey silt hydrate reservoir at W11 station in the Shenhu Sea area of the South China Sea.Tough+Hydrate software was used to calculate the production model;the process of gas production and seepage parameter evolution under different multi-phase seepage conditions were obtained.A sensitivity analysis of the parameters affecting the reservoir productivity was conducted so that:(a)a HBS model with layered heterogeneity can better describe the transmission process of pressure and thermal compensation mechanism of hydrate reservoir;(b)considering the multi-phase seepage parameter heterogeneity,the influence degrees of the parameters on HBS productivity were permeability,porosity and initial hydrate saturation,in order from large to small,and the influence of permeability was significantly greater than that of other parameters;(c)the production potential of the clayey silt reservoir should not only be determined by hydrate content or seepage capacity,but also by the comprehensive effect of the two;and(d)time scales need to

关键词： energy resources natural gas hydrate sensitivity analysis seepage parameters clayey silt reservoir Pearl River Mouth Basin

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Effects of different doses of BMSCs transplantation on silicosis fibrosis in rats

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中国民康医学 2015年第14期 158-159页

作者： GAO Junling ZHAO Manman zhu huixing WANG Xin LI Ran TIAN Yanxia CUI Jianzhong Department of Histology and Embryology School of Medical ScienceUniversity of North China Science and Technology

Objective:To study effects of the exogenous bone mesenchymalstem cells(BMSCs)transplantation on silicosis fibrosisin rats,and to explore dose-effect relationship.Methods:BMSCs were isolated and cultured from male 5-week-old SD rats in vitro.Fifty healthy female SD rats were randomly divided into five groups:model control group,silicosis model group,BMSCs treatment A group(1×106/ml),BMSCs treatment B group(3×106/ml),BMSCs treatment C group(5×106/ml)(n=10).The silicosis model were made by One-time infusion of silica dust suspension,using the non-exposed tracheal intubation,and given different doses of BMSCs as intervention therapy.All the rats were sacrificed on the 21st day after model estalishment.The morphological changes of lung tissue were observed by HE staining and Masson staining;the localization and distribution of TNF-αand TGF-βwere detected by immunohistochemistry;the expression quantity of TNF-α,TGF-β,collagen I and collagen III protein were detected by Western blotting;the sex-determining gene SRY was searched by immunofluorescence to confirme BMSCs home to damage lung tissue.Results:Compared with the model control group,the silicosis model group had significantly alveolitis changes,silicon nodule formation,collagen deposition and other pathological changes.Compared with silicosis model group,the pathological changes above in BMSCs treatment A group were improved;the condition of BMSCs treatment B group was improved significantly;the pathological changes of BMSCs treatment C group were increased obviously.the expression of TNF-α,TGF-β,collagen I and collagen III protein in lung tissue:BMSCs treatment C group>silicosis model group>BMSCs treatment A group>BMSCs treatment B group>model control group.The difference of BMSCs treatment C group and silicosis model group had no statistically significant(P>0.05),and the difference between the other groups had sta-tistically significant(P<0.05).The SRY-positive cells were observed in BMSCs treatment B group by laser scanning confocal microscope,but no significan

关键词： Silicosis BMSCs TNF-α TGF-β Collagen I Collagen Ⅲ

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High-performance carbon-electrode-based self-powered optoelectronic synaptic devices

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Science China(Information Sciences) 2024年第5期67卷 339-340页

作者： Wen HUANG Xuwen XIA huixing ZHANG Tenglong GUO Pengjie HANG Bin LI Jiawei TANG Biao LI Chen zhu Lei WANG Deren YANG Xuegong YU Xing'ao LI Jiangsu Provincial Engineering Research Center of Low Dimensional Physics and New Energy & School of Science Nanjing University of Posts and Telecommunications College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University

A two-terminal self-powered optoelectronic structure could mimic synaptic functions of a human brain synapse unit(Figure 1(a)) based on the photovoltaic effects [1], demonstrating the potential for decreasing energy consumption for future computing. However, current self-powered optoelectronic synaptic devices face issues of stability and cost,which mainly arise from noble metal electrodes and independent hole transport layers used in these structures. Substituting low-cost carbon for these metal electrodes and carrier transport layers may promise to solve these challenges.

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高压旋喷灌浆法改造近井储层对海洋天然气水合物降压开采潜力影响研究

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太阳能学报 2022年第11期43卷 1-8页

作者：龚晔许天福袁益龙辛欣朱慧星吉林大学地下水资源与环境教育部重点实验室长春130021 吉林省水资源与水环境重点实验室长春130021

该文采用高压旋喷灌浆技术对近井储层进行改造,通过在井壁周围形成高渗透泡沫砂浆旋喷桩,结合降压来提升水合物开采效率。以印度K-G盆地NGHP-02-16站位砂质水合物储层为研究对象,构建近井储层改造强化水合物降压开采模型,利用TOUGH+Hydr... 详细信息

该文采用高压旋喷灌浆技术对近井储层进行改造,通过在井壁周围形成高渗透泡沫砂浆旋喷桩,结合降压来提升水合物开采效率。以印度K-G盆地NGHP-02-16站位砂质水合物储层为研究对象,构建近井储层改造强化水合物降压开采模型,利用TOUGH+Hydrate对所提方法的增产效果进行数值分析和定量评价。结果表明:近井储层改造能有效提升水合物降压开采效率;水合物开采效率随旋喷桩改造半径和渗透率的增加而增加,但不受旋喷桩孔隙度的影响;降压幅度增大可进一步提升近井储层改造结合降压开采的增产效果。

关键词：天然气水合物数值模拟海上气井生产降压开采储层改造高压旋喷灌浆

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Effects of over-expression of microRNA-101 on SiO2-induced autophagy in NR8383 cells

Effects of over-expression of microRNA-101 on SiO2-induced a...

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中国解剖学会2019年年会

作者： Gao Junling Chen Si Zhao Manman zhu huixing Wang Xin Bi Huiyang Yang Jingya Tian Yanxia Cui Jianzhong School of Basic Medical Sciences North China University of Science and Technology

The objective of this study is to investigate the effects of micRNA-101 on SiO-induced NR8383 autophagy in NR8383 cells.40 SD rats were randomly divided into control group and model group.The model group was treated with SiO suspension (50 mg/mL),while the control group was injected the same amount of NaCl.Lung tissues were collected at 3,7,14 d and 28 d after SiO treatment.Real

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孔渗非均质性对CO_2羽流地热系统功能影响数值模拟研究

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太阳能学报 2017年第7期38卷 1814-1821页

作者：朱慧星许天福封官宏袁益龙姜振蛟吉林大学地下水资源与环境教育部重点实验室长春130021

以松辽盆地泉头组地层作为研究地层,采用数值模拟的方法分析地层孔渗非均质性对于二氧化碳羽流地热系统的影响。结果表明:由于非均质储层中快速通道的存在,使得在井间距为1000 m,注入压力为16 MPa时,CO_2的产出时间可以由均质储层中的1... 详细信息

以松辽盆地泉头组地层作为研究地层,采用数值模拟的方法分析地层孔渗非均质性对于二氧化碳羽流地热系统的影响。结果表明:由于非均质储层中快速通道的存在,使得在井间距为1000 m,注入压力为16 MPa时,CO_2的产出时间可以由均质储层中的15个月提前到3个月;非均质储层中,CO_2流动集中,储层换热体积减小,产出流体温度下降速率加快;孔渗非均质性既可能引起产出流体温度和系统热提取速率快速下降,也可能导致系统产出流体流量减小,从而使得系统运行期间热提取速率一直偏低。

关键词：二氧化碳羽流地热系统数值模拟孔渗非均质井筒储层耦合

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T2Well单井地下水源热泵水-热耦合数值模拟研究

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太阳能学报 2020年第4期41卷 278-286页

作者：李凤昱许天福封官宏袁益龙朱慧星冯波吉林大学地下水资源与环境教育部重点实验室长春130021

以北京地区实际井参数刻画的单井地下水源热泵为研究对象,利用T2Well模拟器对单井系统地源热泵运行过程进行全面模拟,并对主要参数进行敏感性分析,探究对单井系统生产井温度、热突破时间的影响。距离井筒相同位置不同深度的点,埋深越大... 详细信息

以北京地区实际井参数刻画的单井地下水源热泵为研究对象,利用T2Well模拟器对单井系统地源热泵运行过程进行全面模拟,并对主要参数进行敏感性分析,探究对单井系统生产井温度、热突破时间的影响。距离井筒相同位置不同深度的点,埋深越大受回灌水温度的影响越小。每个运行周期结束时,温度场分布都能得到一定程度的恢复(同一周期内初始温度场相比)。水平方向渗透率同垂向渗透率的比值越大,越有利于回灌水在含水层中的运移,可有效保证热泵系统的取热温差。初步预计一个单井水源热泵系统能满足北京地区约1.5万m^2面积建筑的供暖需求,约1.6万m^2面积建筑制冷需求。

关键词：地源热泵温度场能效井筒-储层耦合模型单井系统

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基于机器学习方法的海洋天然气水合物水平井降压开采模拟—优化耦合模型

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天然气工业 2020年第8期40卷 149-158页

作者：辛欣王海彬罗建男于涵袁益龙夏盈莉朱慧星陈强吉林大学地下水资源与环境教育部重点实验室自然资源部天然气水合物重点实验室·中国地质调查局青岛海洋地质研究所青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室

由天然气水合物(以下简称水合物)开采引起的含水合物沉积层力学变形问题不能被忽视,因其直接威胁到海域水合物的安全开采。为了找到甲烷累计产气量最优值与地层稳定性的关系,基于机器学习方法形成模拟-优化耦合技术,构建起水合物降压开... 详细信息

由天然气水合物(以下简称水合物)开采引起的含水合物沉积层力学变形问题不能被忽视,因其直接威胁到海域水合物的安全开采。为了找到甲烷累计产气量最优值与地层稳定性的关系,基于机器学习方法形成模拟-优化耦合技术,构建起水合物降压开采传热-流动-力学数值模拟模型、可以替代数值模拟模型的机器学习模型和以甲烷累计产气量最优为目标的混合整数非线性规划优化模型;在此基础上,选取南海北部神狐海域厚层Ⅱ类水合物藏W11站位为研究对象,获得了海底面沉降量约束下的水合物储层甲烷累计产气量及相对应的最优开采方案参数。研究结果表明:①模拟-优化耦合技术的关键是机器学习方法的运用,基于径向基函数人工神经网络方法而建立的替代模型计算精度较高,可以替代模拟模型来确定输入输出变量的关系,从而摆脱既定方案的限制,找到全局最优解;②模拟-优化耦合技术可以解决受含水合物沉积层力学响应特征影响的水合物开采方案优选问题,根据试采工程安全要求改变海底面沉降量最大允许值,可以计算得到相应的甲烷累计产气量,以及降压幅度、开采时间、井位布置、水平井段长度等最优开采方案参数;③随着最大允许沉降量增大,甲烷累计产气量增大,二者满足正相关关系;④海底面沉降量随着开采时间增长而增大,也随降压幅度增大而增大;⑤水合物开采引起海底面沉降主要发生在开采初期,为了获得较高甲烷累计产气量及较小海底面沉降量最大允许值,在开采初期必须减小降压幅度。结论认为,所形成的模拟-优化耦合技术适用性强,可以为水合物安全、高效规模化开采方案的制订提供支撑。

关键词：海洋天然气水合物地层稳定性数值模拟机器学习混合整数优化模型开采方案制订水平井

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