检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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 *** 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

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

在线全文

学校读者我要写书评

暂无评论

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 ***,the pore morphology of the slit model involves a single slit,and the carbon nanotube model does not consider the molecular structure of *** 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 *** study of methane adsorption by coal under single condition cannot reveal its *** 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,*** grand canonical Monte Carlo(GCMC)and molecular dynamics simulation method was used to establish the coal molecular structure *** comparing the results with the experimental test results,the accuracy and practicability of the molecular structure model are *** 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 *** relationship between pore morphology,methane aggregation morphology,and coal molecular structure was *** 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 nitrog

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

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

在线全文

学校读者我要写书评

暂无评论

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 pH 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 per- meability of the coal. The permeability of coal samples increased at first and then decreased with immer- sion 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 mD or greater than 2 roD, the effect on the permeabil- ity is low： when the permeability of the coal is in the range 0.2-2 mD, the effect on the permeability is highest. Research into permeability change characteristics can provide a theoretical basis for carbon diox- ide injection under different reservoir permeability conditions and subsequent drainage.

关键词： Carbon dioxide Coal reservoir Permeability Change characteristics

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

在线全文

学校读者我要写书评

暂无评论

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 adso

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

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

在线全文

学校读者我要写书评

暂无评论

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 *** effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were *** adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 *** edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid *** this boundary,the strain rate and pore pressure are ***,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 *** water injection,this boundary is about half of water saturation of ***,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of *** 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 ***,the permeability increases with increasing pore *** the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption ***,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

Dissolution kinetics of Si and Al from montmorillonite in carbonic acid solution

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2014年第1期1卷 31-38页

作者： xiaoming ni Quanzhong Li Wenxue Chen State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic UniversityJiaozuo 454000China School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454000China

The reaction between carbonic acid and montmorillonite minerals was studied in order to provide a theoretical basis for analyzing changes in the physical properties of coal seams after CO_(2)injection and for optimizing CO_(2) pumping parameters.A single montmorillonite mineral of purity[90%was selected and subjected to reactions at 25,35,and 45℃in carbonic acid solutions of varying *** Si and Al concentrations in the solutions and the structure and elemental compositions of the montmorillonite before and after the reactions were analyzed using a spectrophotometer,an X-ray diffractometer,and an energy-dispersive X-ray spectrometer;kinetic reaction models were established for the dissolution of Si and Al in carbonic acid solutions in order to estimate the apparent activation energy of Si dissolution under different acidity *** results indicate that Al dissolved rapidly and soon reached solubility *** the other hand,Si concentration in the solutions increased rapidly and then gradually declined with vibrations,with maximum values at 25,35,and 45℃,which were observed at approximately 96,72,and 48 h,*** addition,Si dissolution fitted the diffusion-controlled reaction model well;as the pH value decreased,the apparent activation energy of Si dissolution decreased,and Si became easier to ***,it was concluded that as a weak acid,carbonic acid causes little damage to the mineral structure of montmorillonite.

关键词： Montmorillonite Carbonic acid solution Dissolution of Si and Al Reaction kinetics

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 *** 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 *** 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 ***

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

在线全文

学校读者我要写书评

暂无评论

二氧化碳催化转化的研究进展

石油化工 2005年第6期34卷 505-512页

作者：倪小明谭猗生韩怡卓中国科学院山西煤炭化学研究所煤转化国家重点实验室

对近几年关于CO2的催化转化生成甲醇、二甲醚、烃类、合成气等基础化工原料以及转化为以碳酸二甲酯为代表的酯类、羧酸、N-甲酰苯胺、各种聚合物等多种具有高附加值的产品的新催化合成过程的研究与开发进行了评述,并对CO2催化转化领域... 详细信息

对近几年关于CO2的催化转化生成甲醇、二甲醚、烃类、合成气等基础化工原料以及转化为以碳酸二甲酯为代表的酯类、羧酸、N-甲酰苯胺、各种聚合物等多种具有高附加值的产品的新催化合成过程的研究与开发进行了评述,并对CO2催化转化领域的研究发展方向进行了初步的探讨。

关键词：二氧化碳催化转化

气/水两相驱替煤粉引起的煤裂缝导流衰减特征实验研究

在线全文

学校读者我要写书评

暂无评论

煤炭学报 2020年第11期45卷 3853-3863页

作者：赵政倪小明刘泽东吴翔河南理工大学能源科学与工程学院河南焦作454000 中原经济区煤层(页岩)气河南省协同创新中心河南焦作454000 陕西陕煤榆北煤业有限公司陕西榆林719000 中联煤层气有限责任公司北京100011

查明气/水两相驱替不同粒径煤粉引起的煤中裂缝导流衰减特征对煤层气井排采时气/水两相流阶段防煤粉措施的制定意义重大。采用自制的气-液-固三相驱替煤粉模拟装置,进行了气/水两相驱替不同粒径(40~60,60~80,80~100,100~150,150~200,>20... 详细信息

查明气/水两相驱替不同粒径煤粉引起的煤中裂缝导流衰减特征对煤层气井排采时气/水两相流阶段防煤粉措施的制定意义重大。采用自制的气-液-固三相驱替煤粉模拟装置,进行了气/水两相驱替不同粒径(40~60,60~80,80~100,100~150,150~200,>200目)煤粉在树脂-煤芯柱样裂缝中的运移实验,通过对比无煤粉气/水两相驱替的空白实验,分析了驱替不同粒径煤粉时气、水的渗流规律差异。基于气/水两相驱替不同粒径煤粉的渗流模型,结合平板理论、拟合得到的气相渗透率与裂缝缝宽的关系,定量描述了驱替过程中气体流动、液体流动、煤粉封堵所占据的裂缝缝宽随驱替时间的变化规律,并以气体、液体流动所占裂缝缝宽之和的变化规律表征了树脂-煤芯柱样裂缝导流能力的衰减特征。结果表明:在几乎相同初始驱替压力下,气、水两相通过树脂-煤芯柱样时会相互争抢柱样内裂缝空间,且气相渗透率、液相渗透率随时间变化呈三角函数分布;不同粒径煤粉驱替前期,柱样气相渗透率、液相渗透率仍会表现出管弦状波动特征,但在煤粉堵塞一定程度后,二者开始同时减小;气/水驱替不同粒径煤粉时产出液内煤粉质量浓度、裂缝完全堵塞时间随煤粉粒径减小而增大;气/水驱替不同粒径煤粉时裂缝导流能力变化可分为液体产出前的裂缝快速封堵、气/液携粉产出的裂缝缝宽小幅增加、液体流动能力骤减的裂缝快速闭合、气体流动能力缓慢降低的裂缝完全封堵等4个阶段。

关键词：气/水两相煤粉不同粒径导流能力堵塞