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Investigation of the impact of threshold pressure gradient on gas production from hydrate deposits

FUEL 2022年 319卷 123569-123569页

作者： Lu, Cheng qin, xuwen Ma, Chao Yu, Lu Geng, Lantao Bian, Hang Zhang, Keni Zhou, Yingfang China Geol Survey Guangzhou Marine Geol Survey Guangzhou 511458 Peoples R China Southern Marine Sci & Engn Guangdong Lab Guangzho Guangzhou 511458 Peoples R China China Geol Survey Ctr Oil & Nat Gas Resource Explorat Beijing 100083 Peoples R China China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China China Geol Survey Beijing 100083 Peoples R China Lawrence Berkeley Natl Lab Energy Geosci Div Berkeley CA USA Univ Aberdeen Sch Engn Aberdeen AB24 3UE Scotland

Many hydrate-bearing sediments are featured with unconsolidated argillaceous siltstones, which exist the non Newtonian flow and threshold pressure gradient due to the high content of clay. In this study, the threshold pressure gradient of hydrate reservoir in the South China Sea is experimentally clarified. The quantitative relationship between it and the reservoir parameters is established. The function of threshold pressure gradient has been added into TOUGH + HYDRATE simulator. Here, site SH2, a candidate for field testing comprising a clayey silt gas hydrate reservoir in the Shenhu area of the South China Sea, was chosen to investigate the effect of threshold pressure gradient on gas production behavior through numerical simulations. The simulation results show that threshold pressure gradient has a significant impact on gas extraction. When the experimental value was applied, the gas production was enhanced unexpectedly, where cumulative gas output doubled in 5 years. The active hydrate dissociating area (gas, water and hydrate coexist) has notably extended, accompanying with the expanding cool zone. Water blockage near well was relieved. However, with the increasing of threshold pressure gradient, propagation of pressure would be restrained seriously. The pressure and hydrate of far-field formations stay "frozen ". The bottom water invasion was weakened.

关键词： Natural gas hydrate Threshold pressure gradient Argillaceous siltstones Numerical simulation

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Micro- and Nanoscale Pore Structure Characterization and Mineral Composition Analysis of Clayey-Silt Hydrate Reservoir in South China Sea

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GEOFLUIDS 2022年第1期2022卷

作者： Lu, Cheng Xia, Yuxuan qin, xuwen Ma, Chao Bian, Hang Xing, Donghui Lu, Hongfeng China Geol Survey Guangzhou Marine Geol Survey Guangzhou 511458 Peoples R China Natl Engn Res Ctr Gas Hydrate Explorat & Dev Guangzhou 511458 Guangdong Peoples R China China Geol Survey Ctr Oil & Nat Gas Resource Explorat Beijing 100083 Peoples R China China Univ Petr State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China Southern Marine Sci & Engn Guangdong Lab Guangzhou Guangzhou 511458 Peoples R China China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China

Natural gas hydrate is a kind of environmentally friendly unconventional energy with large reserves, which attract increasing attention in recent years. The microscopic pore structure and mineral composition of natural gas hydrate reservoir have a great influence on its seepage characteristics during exploitation. In this study, computed tomography and scanning electron microscope are used to obtain digital images of three clayey-silt natural gas hydrate reservoir samples in the Shenhu area of South China Sea, and then, the pore structure and the mineral composition of the samples are obtained after image processing. The result indicates that the clayey-silt samples show strong hydrophilic characteristics, small particles, good sorting properties, variable pore distribution, small average pore and throat radius, large porosity, and a large content of submicron pores. The mineral composition of the reservoir is mainly quartz and contains a certain amount of clay minerals, mainly illite, while the mineral composition of reservoir rich in microbial fossils is mainly carbonate. The results indicate that the pore structure and mineral composition of natural gas hydrate reservoirs in Shenhu area lay a foundation for the efficient development of the clayey-silt reservoir.

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陆域大地电磁基础网规划与展望

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地质通报 2024年第4期43卷 489-502页

作者：秦绪文戴意蕴张耀阳肖都方慧裴发根何大双冯斌中国地质调查局北京100037 中国地质科学院地球物理地球化学勘查研究所河北廊坊065000 国家现代地质勘查技术研究中心河北廊坊065000 自然资源部地球物理电磁法探测技术重点实验室河北廊坊065000

阵列式大地电磁测深是区域地球物理调查的重点发展方向之一,对标国外先进水平和国家社会的基础性需求,中国阵列式大地电磁测深工作程度依然较低,缺乏整体规划,开展全国性观测计划亟需提上日程。系统总结了当前区域地球物理学的发展趋势... 详细信息

阵列式大地电磁测深是区域地球物理调查的重点发展方向之一,对标国外先进水平和国家社会的基础性需求,中国阵列式大地电磁测深工作程度依然较低,缺乏整体规划,开展全国性观测计划亟需提上日程。系统总结了当前区域地球物理学的发展趋势及国内外大地电磁网建设现状,提出了合作共建陆域多层级大地电磁基础网和大数据中心的顶层设计和规划布局,并对中国大地电磁基础网未来的重点发展方向进行了展望和思考。相关工作的顺利开展将为中国的区域地球物理调查拓展一项新属性参数,推动构建物性地球、结构地球和地球物理场四维模型,进而变革区域地球物理研究范式和工作模式,支撑中国深地探测走向世界前列。

关键词：区域地球物理大地电磁测深深地探测基础网建设观测监测体系数据库

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中国南海天然气水合物开采储层水合物相变与渗流机理:综述与展望

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中国地质 2022年第3期49卷 749-769页

作者：秦绪文陆程王平康梁前勇中国地质调查局北京100037 中国地质调查局广州海洋地质调查局广东广州510075 天然气水合物勘查开发国家工程研究中心广东广州510075 中国地质调查局油气资源调查中心北京100083

【研究目的】中国地质调查局先后于2017年、2020年在南海北部神狐海域成功实施两轮水合物试采,创造了产气时间最长、产气总量最大、日均产气量最高等多项世界纪录,了解和掌握南海天然气水合物开采储层相变与渗流机理,有助于进一步揭示... 详细信息

【研究目的】中国地质调查局先后于2017年、2020年在南海北部神狐海域成功实施两轮水合物试采,创造了产气时间最长、产气总量最大、日均产气量最高等多项世界纪录,了解和掌握南海天然气水合物开采储层相变与渗流机理,有助于进一步揭示该类型水合物分解机理、产出规律、增产机制等,可为中国海域水合物资源规模高效开采提供理论基础。【研究方法】基于两轮试采实践,笔者通过深入研究发现,储层结构表征、水合物相变、多相渗流与增渗、产能模拟与调控是制约水合物分解产气效率的重要因素。【研究结果】研究表明,南海水合物相变具有分解温度低,易在储层内形成二次水合物等特点,是由渗流场-应力场-温度场-化学场共同作用的复杂系统;多相渗流作用主要受控于未固结储层的物性特征、水合物相变、开采方式等多元因素影响,具有较强的甲烷吸附性、绝对渗透率易突变、气相流动能力弱等特点;围绕南海水合物长期、稳定、高效开采目标,需要在初始储层改造基础上,通过实施储层二次改造,进一步优化提高储层渗流能力,实现增渗扩产目的。【结论】随着天然气水合物产业化进程不断向前推进,还需要着力解决大规模长时间产气过程中温度压力微观变化及物质能源交换响应机制以及水合物高效分解、二次生成边界条件等难题。

关键词：天然气水合物泥质粉砂储层水合物相变渗流机理海域天然气水合物勘查试采工程南海中国

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消音缝结构对75Cr1材质圆锯片旋转状态下振动特性的影响

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工具技术 2024年第10期58卷 75-82页

作者：秦绪文王玉奇王继荣白硕玮张华辰青岛大学机电工程学院

在锯片基体设计消音缝结构是75Cr1材质圆锯片重要的减振降噪方式。为研究消音缝加工位置对旋转状态下75Cr1材质圆锯片振动特性的作用机理,构建了考虑离心应力影响的75Cr1材质圆锯片模态仿真模型,分别探究了在其基体内部和边缘加工消音... 详细信息

在锯片基体设计消音缝结构是75Cr1材质圆锯片重要的减振降噪方式。为研究消音缝加工位置对旋转状态下75Cr1材质圆锯片振动特性的作用机理,构建了考虑离心应力影响的75Cr1材质圆锯片模态仿真模型,分别探究了在其基体内部和边缘加工消音缝对旋转模态振型以及固有频率的影响。结果表明:加工基体消音缝后,不易产生驻波共振,模态的固有频率发生分离;加工边缘消音缝后,部分模态振型的阶次顺序发生改变,不利于动态稳定性的模态振型阶次后移;基体内部消音缝的模态分离作用较强,边缘消音缝的模态分离作用较弱。本研究结论对制锯企业面向不同工作转速需求的消音缝优化设计具有一定指导意义。

关键词：圆锯片消音缝离心应力振动特性分析

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南海天然气水合物试采储层热流耦合与温度场调控研究进展

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地质学报 2024年第11期98卷 3213-3224页

作者：秦绪文陆程张召彬王平康李守定董艳辉马超何玉发庞守吉中国自然资源航空物探遥感中心北京100083 中国地质调查局油气资源调查中心北京100083 自然资源部青海木里天然气水合物与冻土环境野外科学观测研究站北京100083 天然气水合物勘查开发国家工程技术研究中心广东广州510075 中国科学院地质与地球物理研究所北京100029 中国地质调查局北京100037 中国地质调查局广州海洋地质调查局广东广州510075 中海油研究总院有限责任公司北京100028

中国南海天然气水合物储层类型以泥质粉砂为主,与其他国家和地区的砂质储层相比开采难度大。本文针对南海北部泥质粉砂天然气水合物降压开采涉及的相变习性演化、有效渗透率变化、热流耦合模式、试采系统温度场调控与矿场尺度增温防冰... 详细信息

中国南海天然气水合物储层类型以泥质粉砂为主,与其他国家和地区的砂质储层相比开采难度大。本文针对南海北部泥质粉砂天然气水合物降压开采涉及的相变习性演化、有效渗透率变化、热流耦合模式、试采系统温度场调控与矿场尺度增温防冰等关键问题,综述了笔者团队近年来取得的最新研究成果。研究表明,泥质粉砂型水合物相变始终处于动态平衡状态,储层因富含黏土水合物相变滞后效应明显;试采井壁处节流膨胀效应强烈,“温度漏斗”斜率最大,一旦形成“水锁”与生成二次水合物,气相渗流能力将明显降低;在无外部热源补给情况下,较高的产气速率,易造成水合物分解速率减缓直至停止分解,中国南海泥质粉砂水合物分解主要受传热控制模式影响,亟需建立有效的“储层-井筒”试采系统多元温压调控与安全流动机制,提高产气效率;依托自然资源部青海木里天然气水合物与冻土环境野外科学观测研究站,利用原位补热降压充填的水合物开采方法,成功完成矿场尺度水合物试采系统温度场改造试验,进一步优化提高了储层渗流能力,实现了增渗扩产目的。

关键词：泥质粉砂试采系统相变习性热流耦合温度场改造

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Investigation of anionic group effects on the shale inhibition performance of fatty acid-based ionic liquids and their inhibition mechanism

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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 2022年第0期636卷 128135-128135页

作者： Jia, Han Wang, Shaoyan Wang, Zhe Wang, Qiang Jia, Haidong Song, Lin qin, xuwen Fan, Fangning Li, Zhe Huang, Pan China Univ Petr East China Key Lab Unconvent Oil & Gas Dev Minist Educ Qingdao 266580 Peoples R China China Univ Petr East China Shandong Key Lab Oilfield Chem Sch Petr Engn Qingdao 266580 Peoples R China Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada

Ionic liquids (ILs) have been introduced as novel high-performance shale inhibitors. The inhibition performance and mechanism of the cation groups in ILs have been widely investigated, whereas the effects of the anionic groups in ILs on the inhibitory capacity have rarely been reported. In this work, a series of fatty acid-based ionic liquids (FAILs) with different anionic groups, methyltrioctylammonium octanoate ([N8881][C8:0]), methyltrioctylammonium laurate ([N8881][C12:0]), and methyltrioctylammonium palmitate ([N8881][C16:0]), were synthesized to evaluate their inhibition ability via the sodium bentonite (Na-Bent) immersion test, the linear swelling test, and the shale hot-rolling recovery test. Compared with the traditional inhibitor KCl (2 wt%), FAIL [N8881][C8:0] showed greater inhibition performance at a much lower concentration (0.1 wt%). The inhibition mechanism of FAILs was further analysed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), zeta potential measurements, and contact angle measurements. It was speculated that the best inhibition ability and thermal stability of [N8881][C8:0] should be attributed to the intensive interaction and the sizematching effect between cationic and anionic groups. The present study provided novel insight into the research and development of high-efficiency shale inhibitors.

关键词： Shale inhibitor Fatty acid-based ionic liquids Size-matching effect Intermolecular interaction Inhibition mechanism

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Overview of Molecular Dynamics Simulation of Natural Gas Hydrate at Nanoscale

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GEOFLUIDS 2021年第1期2021卷

作者： Qi, Rongrong qin, xuwen Bian, Hang Lu, Cheng Yu, Lu Ma, Chao Southern Marine Sci & Engn Guangdong Lab Guangzho Guangzhou 511458 Peoples R China China Geol Survey Guangzhou Marine Geol Survey Guangzhou 511458 Peoples R China China Geol Survey Gas Hydrate Engn Technol Ctr Guangzhou 510760 Peoples R China China Geol Survey Beijing 100083 Peoples R China China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China China Geol Survey Ctr Oil & Nat Gas Resource Explorat Beijing 100083 Peoples R China

As a dynamic research method for molecular systems, molecular dynamic (MD) simulation can represent physical phenomena that cannot be realized by experimental means and discuss the microscopic reaction mechanism of things from the molecular level. In this paper, the previous research results were reviewed. First, the MD simulation process was briefly described, then, the applicability of different molecular force fields in the natural gas hydrate (NGH) system was discussed, and finally, the application of MD simulation in the formation and decomposition law of NGH was summarized from the perspective of NGH mining. The results show that the selection of water molecular force field has a great influence on the simulation results, and the evaluation of water model applicable to the simulation of NGH under different thermodynamic states is still an open research field that needs to be paid attention to. The effect of surface properties of porous media (such as crystallinity and hydrophilicity) on hydrate needs to be further studied. Compared with thermodynamic inhibitors, kinetic inhibitors (such as amino acids) have more promising research prospects, and further research can be carried out in the screening of efficient kinetic inhibitors in the future.

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基于高分辨率卫星遥感技术的风化层厚度制图方法

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地质科技通报 2020年第3期39卷 220-226页

作者：秦绪文唐壮陈伟涛广州海洋地质调查局广州510075 中国地质大学(武汉) 武汉430074

区域尺度风化层厚度是制约民用和军事地质工程施工、陆域军事交通能力重要因素之一。传统方法通常都需要大量的野外踏勘和实地采样,效率较低,在人迹罕至、人不能至的地区无法完成。因此,利用高分辨率遥感技术开展区域尺度风化层厚度制... 详细信息

区域尺度风化层厚度是制约民用和军事地质工程施工、陆域军事交通能力重要因素之一。传统方法通常都需要大量的野外踏勘和实地采样,效率较低,在人迹罕至、人不能至的地区无法完成。因此,利用高分辨率遥感技术开展区域尺度风化层厚度制图研究具有非常重要的意义。在野外调查的基础上,利用国产高分二号卫星数据,采用人机交互目视解译方法获取研究区岩性、土地覆盖类型分布图,并基于ASTER GDEM数据获取地形地貌图像;然后,以坡度、岩性、土地覆盖类型为影响因子,基于云模型理论和方法综合评估获取研究区的风化层厚度图,制图结果与野外验证数据吻合度较好,精度可达81.69%。

关键词：风化层厚度云模型军事地质遥感高分辨率遥感

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The Characteristics of Gas-Water Two-Phase Radial Flow in Clay-Silt Sediment and Effects on Hydrate Production

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GEOFLUIDS 2021年第1期2021卷

作者： Lu, Cheng qin, xuwen Yu, Lu Geng, Lantao Mao, Wenjing Bian, Hang Meng, Fanle Yang, Jianhui China Geol Survey Guangzhou Marine Geol Survey Guangzhou 510760 Peoples R China Southern Marine Sci & Engn Guangdong Lab Guangzho Guangzhou 511458 Peoples R China China Geol Survey Ctr Oil & Nat Gas Resource Explorat Beijing 100083 Peoples R China China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China China Geol Survey Gas Hydrate Engn Technol Ctr Guangzhou 510760 Peoples R China China Geol Survey Beijing 100083 Peoples R China

Many hydrate-bearing sediments in the Shenhu area of the South China Sea are featured with unconsolidated clayed silt, small particle size, and high content of clay, which can pose a great challenge for gas production. In order to investigate the gas-water relative permeability in clay-silt sediments, through a radial flow experiment, samples from the target sediment in the Shenhu area were selected and studied. The results show that the irreducible water saturation is high and the influence of the gas-water interaction is obvious. The relative permeability analysis shows that the two-phase flow zone is narrow and maximum gas relative permeability is below 0.1. The flow pattern in clay-silt sediment is more complicated, and the existing empirical models are inadequate for flow characterization. The depressurization method to extract a hydrate reservoir with clay-silt sediments faces the problem of insufficient production capacity. Compared with the ordinary hydrate reservoir with sandstone sediment, the hydrate reservoir with clay-silt sediment has a low permeability and poor gas flow capacity. The gas-water ratio abnormally decreases during the production. It is urgent to enhance production with cost-effective measures.

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