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Reconstruction of different scales of pore-fractures network of coal reservoir and its permeability prediction with Monte Carlo method

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International Journal of Mining Science and Technology 2017年第4期27卷 693-699页

作者： ni xiaoming Chen Wenxue Li Zheyuan Gao Xiang School of Energy Science and Engineering School of Civil Engineering Henan Polytechnic University Jiaozuo 454000 China Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region Jiaozuo 454000 China Opening Project of Key Laboratory of Deep Mine Construction Henan Polytechnic University Jiaozuo 454000 China Department of Building Civil & Environmental Engineering Concordia University Montreal H3G1M8 Canada china Coal Tunnel Engineering Go. LTD Xuzhou 221000 China

There are millimeter, micron and nanometer scales of pores and fractures in coal to describe different scales of coal pores and fissures communicating path and to quantitatively characterize their permeability. Such information provides an important basis for studying coalbed methane output mechanism. The pores and fissures in a large number of coal samples were observed and counted by scanning electron microscopy and optical microscopy. The probability distribution models of pore-fissure network were then established. Different scales of pore-fissures 2D network models were reconstructed by Monte Carlo method. The 2D seepage models were obtained through assignment zero method and using Matlab software. The effect of permeability on different scale pore-fractures network was obtained by two-dimensional seepage equation. Predicted permeability is compared with the measured ones. The results showed that the dominant order of different scale pore-fractures connected path from high to low is millimeter-sized fractures, seepage pores and micron-size fractures. The contribution of coal reservoir permeability from large to small is millimeter-size fractures, micron-size fractures and seepage pores. Different parameters in different scale pore-fractures are of different influence permeability.Reconstruction of different scale pore-fractures network can clearly display the connectivity of porefractures, which can provide a basis for selecting migration path and studying gas flow pattern.

关键词： Fractures network Different scales Reconstruction Permeability

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Permeability variation characteristics of coal after injecting carbon dioxide into a coal seam

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International Journal of Mining Science and Technology 2015年第4期25卷 665-670页

作者： ni xiaoming Li Quanzhong Wang Yanbin Gao Shasha School of Energy Science and Engineering Henan Polytechnic University Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region College of Geoscience and Surveying Engineering China University of Mining & Technology

A theoretical basis for the optimization of carbon dioxide injection parameters and the development of the drainage system can be provided by identifying the permeability change characteristic of coal and rock after injection of carbon dioxide into the coal seam. Sihe, Yuwu, and Changcun mines were used as research sites. Scanning electron microscopy and permeability instruments were used to measure coal properties such as permeability and surface structure of the coal samples at different p H values of carbon dioxide solution and over different timescales. The results show that the reaction between minerals in coal and carbonate solution exhibit positive and negative aspects of permeability-the dissolution reaction between carbonate minerals in coal and acid solution improves the conductivity of coal whilst, on the other hand, the clay minerals in the coal(mainly including montmorillonite, illite and kaolinite) exhibit expansion as a result of ion exchange with the H+in acid solution, which has a negative effect on the permeability of the coal. The permeability of coal samples increased at first and then decreased with immersion time, and when the soaking time is 2–3 months the permeability of the coal reached a maximum. In general, for coals with permeabilities less than 0.2 m D or greater than 2 m D, the effect on the permeability is low; when the permeability of the coal is in the range 0.2–2 m D, the effect on the permeability is highest. Research into permeability change characteristics can provide a theoretical basis for carbon dioxide injection under different reservoir permeability conditions and subsequent drainage.

关键词：二氧化碳溶液渗透率煤层特征扫描电子显微镜碳酸盐矿物排水系统时间尺度

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Adsorption Mechanism and Kinetic Characterization of Bituminous Coal under High Temperatures and Pressures in the Linxing-Shenfu Area

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 399-408页

作者： TAO Chuanqi WANG Yanbin LI Yong ni xiaoming GAO Xiangdong School of Mining Engineering Liaoning Shihua UniversityFushun 113001LiaoningChina Liaoning Key Lab of Petro-chemical Special Building Materials College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000ShangdongChina School of Earth Science.East China University of Technology NanchangJiangxi 30013.China

The majority of coalbed methane(CBM) in coal reservoirs is in adsorption states in coal matrix pores. To reveal the adsorption behavior of bituminous coal under high-temperature and high-pressure conditions and to discuss the microscopic control mechanism affecting the adsorption characteristics, isothermal adsorption experiments under hightemperature and high-pressure conditions, low-temperature liquid nitrogen adsorption-desorption experiments and CO2 adsorption experiments were performed on coal samples. Results show that the adsorption capacity of coal is comprehensively controlled by the maximum vitrinite reflectance(Ro, max), as well as temperature and pressure conditions. As the vitrinite reflectance increases, the adsorption capacity of coal increases. At low pressures, the pressure has a significant effect on the positive effect of adsorption, but the effect of temperature is relatively weak. As the pressure increases, the effect of temperature on the negative effect of adsorption gradually becomes apparent, and the influence of pressure gradually decreases. Considering pore volumes of pores with diameters of 1.7-100 nm, the peak volume of pores with diameters 10-100 nm is higher than that from pores with diameters 1.7-10 nm, especially for pores with diameters of 40-60 nm, indicating that pores with diameters of 10-100 nm are the main contributors to the pore volume. The pore specific surface area shows multiple peaks, and the peak value appears for pore diameters of 2-3 nm, indicating that this pore diameter is the main contributor to the specific surface area. For pore diameters of 0.489-1.083 nm, the pore size distribution is bimodal, with peak values at 0.56-0.62 nm and 0.82-0.88 nm. The adsorption capability of the coal reservoir depends on the development degree of the supermicroporous specific surface area, because the supermicroporous pores are the main contributors to the specific pore area. Additionally, the adsorption space increases as the adsorption equilibrium pressure increases. Under the

关键词： coalbed methane pressure and temperature energy nanoporosity Ordos Basin

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基于上覆岩层应力场和裂缝场演化的采动井套管破断特征及防控对策

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煤炭科学技术 2024年第1期52卷 221-231页

作者：李延河倪小明王保玉谭学斌平顶山天安煤业股份有限公司河南平顶山467000 中国平煤神马控股集团有限公司河南平顶山467000 河南理工大学能源科学与工程学院河南焦作454000 河南理工大学煤系气资源高效开发研究院河南焦作454000

准确确定出煤矿采动井套管破断特征并提出相应的防控对策,能为井筒长期稳定提供重要保障。以平顶山矿区的二1煤层及上覆岩层为研究对象,采用理论计算与数值模拟软件模拟方法,确定出上覆岩层离层段应力和位移分布规律,分析了上覆岩层高... 详细信息

准确确定出煤矿采动井套管破断特征并提出相应的防控对策,能为井筒长期稳定提供重要保障。以平顶山矿区的二1煤层及上覆岩层为研究对象,采用理论计算与数值模拟软件模拟方法,确定出上覆岩层离层段应力和位移分布规律,分析了上覆岩层高度、距工作面水平距离与应力、位移的相关性,拟合出上覆岩层高度、距工作面水平距离与应力、位移的关系式;根据研究区采动井的实际开发经验,确定出最佳布井区域下的套管主要破断类型,结合常用套管力学参数,得出“两场”演化下的套管破断位置及长度等特征;对常用的采动井局部防护技术进行总结,并提出对应的防控对策。结果表明:工作面推进过程中,上覆岩层应力呈现出“波动-线性降低”的变化规律,位移呈现出“几乎未发生变化-类双曲线型”的变化规律。最佳布井区域下的采动井套管主要以拉伸缩径和剪切破断为主,选择施加套管加强件对采动井套管进行加固。研究区地面采动井三开段采用N80套管时,需在煤层上部46 m亚关键层处、54 m软硬互层处分别加设抗拉伸套管加强件和抗剪切加强件;采用P110套管时,需在煤层上部46 m亚关键层处加设抗拉伸加强件。建议研究区地面采动井三开段均采用P110套管,增加采动井的井筒稳定性。该研究成果为平顶山矿区及相似条件下采动井预防套管破断提供了理论指导。

关键词：采动井套管破断防控对策加强件上覆岩层组合

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Characteristics of Tight Sandstone Reservoirs and Controls of Reservoir Quality: A Case Study of He 8 Sandstones in the Linxing Area, Eastern Ordos Basin, China

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 637-659页

作者： GAO Xiangdong WANG Yanbin LI Yong GUO Hui ni xiaoming WU Xiang ZHAO Shihu College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590ShandongChina Development and Research Center of China Geological Survey Beijing 100037China School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000HenanChina China United Coalbed Methane Corporation Limited Beijing 100015China

Determining the process of densification and tectonic evolution of tight sandstone can help to understand the distribution of reservoirs and find relatively high-permeability areas.Based on integrated approaches of thin section,scanning electron microscopy(SEM),cathode luminescence(CL),nuclear magnetic resonance(NMR),X-ray diffraction(XRD),N2 porosity and permeability,micro-resistivity imaging log(MIL)and three-dimensional seismic data analysis,this work discussed the reservoir characteristics of the member 8 of the Permian Xiashihezi Formation(He 8 sandstones)in the Linxing area of eastern Ordos Basin,determined the factors affecting reservoir quality,and revealed the formation mechanism of relatively high-permeability areas.The results show that the He 8 sandstones in the Linxing area are mainly composed of feldspathic litharenites,and are typical tight sandstones(with porositynic movements play an important role in improving the reservoir quality.The current tectonic traces of the study area are m

关键词： tight gas reservoir quality high-permeability reservoirs Linxing area eastern Ordos Basin

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Effects of coal molecular structure and pore morphology on methane adsorption and accumulation mechanism

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Frontiers of Earth Science 2023年第1期17卷 262-272页

作者： Jingshuo ZHANG xiaoming ni Ying HAN Junfeng LIN School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China

The adsorption,diffusion,and aggregation of methane from coal are often studied based on slit or carbon nanotube models and isothermal adsorption and thermodynamics theories.However,the pore morphology of the slit model involves a single slit,and the carbon nanotube model does not consider the molecular structure of coal.The difference of the adsorption capacity of coal to methane was determined without considering the external environmental conditions by the molecular structure and pore morphology of coal.The study of methane adsorption by coal under single condition cannot reveal its mechanism.In view of this,elemental analysis,FTIR spectrum,XPS electron energy spectrum,13C NMR,and isothermal adsorption tests were conducted on the semi-anthracite of Changping mine and the anthracite of Sihe Mine in Shanxi Province,China.The grand canonical Monte Carlo(GCMC)and molecular dynamics simulation method was used to establish the coal molecular structure model.By comparing the results with the experimental test results,the accuracy and practicability of the molecular structure model are confirmed.Based on the adsorption potential energy theory and aggregation model,the adsorption force of methane on aromatic ring structure,pyrrole nitrogen structure,aliphatic structure,and oxygen-containing functional group was calculated.The relationship between pore morphology,methane aggregation morphology,and coal molecular structure was revealed.The results show that the adsorption force of coal molecular structure on methane is as follows:aromatic ring structure(1.96 kcal/mol)>pyridine nitrogen(1.41 kcal/mol)>pyrrorole nitrogen(1.05 kcal/mol)>aliphatic structure(0.29 kcal/mol)>oxygen-containing functional group(0.20 kcal/mol).In the long and narrow regular pores of semi-anthracite and anthracite,methane aggregates in clusters at turns and aperture changes,and the adsorption and aggregation positions are mainly determined by the aromatic ring structure,the positions of pyrrole nitrogen and pyridine nitrogen.The degree of aggregati

关键词： Grand Canonical Monte Carlo pore morphology methane adsorption molecular structure of coal

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Combined control of fluid adsorption capacity and initial permeability on coal permeability

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International Journal of Coal Science & Technology 2022年第6期9卷 127-137页

作者： Xiaolei Liu Jianping Wei Guoying Wei Caifang Wu Cao Liu xiaoming ni State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic University454000 JiaozuoHenanChina College of Safety Science and Engineering Henan Polytechnic University454000 JiaozuoHenanChina State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization 454000 JiaozuoHenanChina Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process Ministry of EducationSouth Jiefang Road221008 XuzhouJiangsuChina Collaborative Innovation Center of Coalbed Methane(Shale Gas)in Central Plains Economic Zone 454000 JiaozuoChina

The variations of strain and permeability of coal were systematically studied through the physical simulation of N2 and water injection.The effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were discussed.The adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 injection.An edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid saturation.Within this boundary,the strain rate and pore pressure are independent.Moreover,the injec-tion time of initial stage accounts for about 20%of the total injection time,but the strain accounts for 70%of the total strain.For water injection,this boundary is about half of water saturation of coal.Besides,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of coal.When the initial permeability is large enough,the effect of adsorption strain on permeability is relatively weak,and the promoting effect of pore pressure on fluid migration is dominant.Therefore,the permeability increases with increasing pore pressure.When the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption capacity.However,for the fluid with strong adsorption capacity,the adsorption strain caused by pore pressure may play a leading role,and the permeability reduces first and then ascends with increasing pore pressure.

关键词： Initial permeability Adsorption capacity Free adsorption Pore pressure Coal strain

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天然气储层裂隙中气-液两相流的流态转变条件数学模型

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煤炭科学技术 2024年第6期52卷 155-164页

作者：闫晋倪小明郭盛强何庆宏赵彦伟宋金星河南理工大学能源科学与工程学院河南焦作454000 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454000 山西蓝焰煤层气集团有限责任公司山西晋城048200

气-液两相在储层裂隙中流动时可能存在气泡流、段塞流、环雾流等流态,查明流动时流态转变条件能为气-液两相流流态形成机理研究提供依据,有助于天然气井的生产管控。根据气-液两相流不同流态的流动特点,结合连续介质控制理论和动量守恒... 详细信息

气-液两相在储层裂隙中流动时可能存在气泡流、段塞流、环雾流等流态,查明流动时流态转变条件能为气-液两相流流态形成机理研究提供依据,有助于天然气井的生产管控。根据气-液两相流不同流态的流动特点,结合连续介质控制理论和动量守恒原理,构建了气泡流-段塞流-环雾状流等流态之间转变的数学模型,确定了各流态间变化的临界条件和主控因素,通过气-液运移产出微观流动物理模拟试验验证了所建数学模型的准确性。结果表明:气-液两相在裂隙中的流态转变是气/液相的物理性质、注气通道孔径、裂隙流动通道孔径、气相流体流速、液相流体流速等因素耦合作用的结果。气泡流与段塞流能否转变主要取决于初生气泡大小、流动通道空间、液相界面波高度;段塞流与环雾流间能否转变取决于气相流体能否击碎液相流体并使之悬浮。不同流态间转变的主要控制因素不同:气泡流与段塞流相互转变的主控因素为裂隙系统的孔径,注气通道孔径越大、流动通道孔径越小,越容易发生段塞流;段塞流与环雾流相互转化的主控制因素为流体流速、气/液相流体的物理性质,气/液相对速度越大、气/液密度差越小、液相表面张力越小,越容易发生环雾流。研究成果能够为天然气储层裂隙中气-液两相流态形成机理和天然气运移产出研究提供理论依据。

关键词：储层裂隙气-液两相流流态转化流体流速气泡流段塞流环雾流

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气液两相段塞流在裂隙中流动规律实验

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特种油气藏 2024年第3期31卷 98-105页

作者：倪小明赵彦伟郭盛强何庆宏闫晋宋金星河南理工大学河南焦作454000 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454000 山西蓝焰煤层气集团有限责任公司山西晋城048200

针对储层裂隙中段塞流流动规律认识不清、控制因素不明确的问题,利用气液两相运移产出微观流动模拟实验装置,研究了段塞流在裂隙中的流动规律,分析了裂隙直径、气液两相流量等对段塞流流动关键参数的影响及流量波动特征。研究表明:气液... 详细信息

针对储层裂隙中段塞流流动规律认识不清、控制因素不明确的问题,利用气液两相运移产出微观流动模拟实验装置,研究了段塞流在裂隙中的流动规律,分析了裂隙直径、气液两相流量等对段塞流流动关键参数的影响及流量波动特征。研究表明:气液两相段塞流在裂隙中呈现周期性特征,从形成到消失可分为气塞形成、气塞扩大、气塞主导3个阶段;裂隙直径与段塞频率呈线性负相关,与气液相流量波动幅度呈线性正相关;当液相流量为15.00、20.00、25.00、30.00 cm^(3)/min时,随着气相流量的增加,段塞频率的变化速率分别为0.130、0.012、0.009、0.007,持液率变化速率分别为1.503、1.175、0.918、0.820。该研究结果对煤层气开发过程中段塞流机理研究具有指导意义。

关键词：气液两相流周期性段塞流持液率裂隙直径

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厚冲积层薄基岩条件下采动井稳孔工艺与应用

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煤炭技术 2024年第3期43卷 12-15页

作者：李延河朱林吕闰生王保玉倪小明常会珍平顶山天安煤业股份有限公司河南平顶山467000 河南理工大学资源环境学院河南焦作454000 河南理工大学煤系气资源高效开发研究院河南焦作454000 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454000 山西蓝焰煤层气工程研究有限责任公司山西晋城048000

以平煤股份八矿煤层气采动井01井为研究对象,借助钻井窥视仪获取了不同层位的套管变形破坏特征,分析了导致套管变形的主要影响因素。在此基础上,设计了基于“抗、让、防”稳孔工艺的井身结构和稳孔措施,并对同一井场的05井应用。结果表... 详细信息

以平煤股份八矿煤层气采动井01井为研究对象,借助钻井窥视仪获取了不同层位的套管变形破坏特征,分析了导致套管变形的主要影响因素。在此基础上,设计了基于“抗、让、防”稳孔工艺的井身结构和稳孔措施,并对同一井场的05井应用。结果表明,同产气周期下,基于稳孔工艺设计的采动井套管完整度高、变形小、产气量稳定。此稳孔工艺可为相似地质条件下的采动井井身结构设计提供经验参考。

关键词：厚冲积层薄基岩煤层气采动井套管变形稳孔工艺

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