Journal of China University of Mining and Technology最新文献_第2页

Method for predicting economic peak yield for a single well of coalbed methane 煤层气单井经济峰值产量预测方法

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60287-4

Shen YANG , Yong-shang KANG , Qun ZHAO , Hong-yan WANG , Jing-ming LI

{"title":"Method for predicting economic peak yield for a single well of coalbed methane","authors":"Shen YANG , Yong-shang KANG , Qun ZHAO , Hong-yan WANG , Jing-ming LI","doi":"10.1016/S1006-1266(08)60287-4","DOIUrl":"10.1016/S1006-1266(08)60287-4","url":null,"abstract":"<div><p>The development of coalbed methane (CBM) in China poses great difficulties because of high investments, low production and high risks. So a study of the economic effect of a single well at its preliminary stage is helpful for commercial exploitation of CBM. Affected by wellbore flow pressure, initial reservoir pressure, relative permeability, Langmuir pressure and other factors, the trend of declining production of a single CBM well agrees, by and large, with a hyperbolic pattern of decline. Based on Arps's equation, nearly 200 wells production with different peak yields and initial rates of were simulated. Given the present cost of drilling, gas production and engineering on the ground, the gross investment for the development of a single coalbed methane well was estimated for the Fanzhuang block in central China. Considering the current industrial policies for CBM, we established an economic assessment model and analyzed economic peaks. The results show the economic benefits with or without government subsidies at different peak yields of a single CBM well. The results of the evaluation can be directly applied in the Fanzhuang block. The evaluation method, formulated in our study, can be used to other areas with similar conditions.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 521-526"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60287-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79415495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Recognition of Milankovitch cycles in the stratigraphic record: application of the CWT and the FFT to well-log data 地层记录中米兰科维奇旋回的识别:CWT和FFT在测井资料中的应用

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60301-6

Ji-feng YU , Feng-gui SUI , Zeng-xue LI , Hua LIU , Yu-lin WANG

{"title":"Recognition of Milankovitch cycles in the stratigraphic record: application of the CWT and the FFT to well-log data","authors":"Ji-feng YU , Feng-gui SUI , Zeng-xue LI , Hua LIU , Yu-lin WANG","doi":"10.1016/S1006-1266(08)60301-6","DOIUrl":"10.1016/S1006-1266(08)60301-6","url":null,"abstract":"<div><p>The authors applied a the combination of Continuous Wavelet Transform (CWT) and Fast Fourier Transform (FFT) methods to gamma ray well-log data from the Q3, G1 and D2 wells. This high-resolution stratigraphic study was based on Milankovitch's orbital cycle theory. It was found that the CWT scale factors, ‘<em>a</em>,’ of 12, 24 and 60 match the ratios of the periodicities of precession, obliquity and eccentricity very well. Nine intervals of the Permo-carboniferous strata were recognized to have Milankovitch cycles in them. For example, section A of well Q3 has 29 precession cycles, 15 obliquity cycles and 7 short eccentricity cycles. The wavelengths are 2.7, 4.4 and 7.8 m for precession, obliquity and eccentricity, respectively. Important geological parameters such as the stratigraphic completeness and the accumulation rate were also estimated. These results provide basic information for further cyclostratigraphic correlation studies in the area. They are of great significance for the study of ancient and future climate change.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 594-598"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60301-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80578121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Desulfurization of coal by an electrochemical-reduction flotation technique 煤的电化学-还原浮选脱硫

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60296-5

Wei ZHAO, Wen-juan XU, Shi-teng ZHONG, Zhi-min ZONG

引用次数: 25

Theory and technology of preventing water from flooding roadways 道路防水理论与技术

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60283-7

S. Cao, Shi-song Hou, Zhong-hua Li

引用次数: 2

Comprehensive analysis of slope stability and determination of stable slopes in the Chador-Malu iron ore mine using numerical and limit equilibrium methods 用数值法和极限平衡法对Chador-Malu铁矿边坡稳定性进行综合分析，确定稳定边坡

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60281-3

M ATAEI, S BODAGHABADI

{"title":"Comprehensive analysis of slope stability and determination of stable slopes in the Chador-Malu iron ore mine using numerical and limit equilibrium methods","authors":"M ATAEI, S BODAGHABADI","doi":"10.1016/S1006-1266(08)60281-3","DOIUrl":"https://doi.org/10.1016/S1006-1266(08)60281-3","url":null,"abstract":"<div><p>One of the critical aspects in mine design is slope stability analysis and the determination of stable slopes. In the Chador-Malu iron ore mine, one of the most important iron ore mines in central Iran, it was considered vital to perform a comprehensive slope stability analysis. At first, we divided the existing rock hosting pit into six zones and a geotechnical map was prepared. Then, the value of MRMR (Mining Rock Mass Rating) was determined for each zone. Owing to the fact that the Chador-Malu iron ore mine is located in a highly tectonic area and the rock mass completely crushed, the Hoek-Brown failure criterion was found suitable to estimate geo-mechanical parameters. After that, the value of cohesion (<em>c</em>) and friction angle <em>(ö)</em> were calculated for different geotechnical zones and relative graphs and equations were derived as a function of slope height. The stability analyses using numerical and limit equilibrium methods showed that some instability problems might occur by increasing the slope height. Therefore, stable slopes for each geotechnical zone and prepared sections were calculated and presented as a function of slope height.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 488-493"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60281-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91740865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Effect of pre-tensioned rock bolts on stress redistribution around a roadway—insight from numerical modeling 预张锚杆对巷道周边应力重分布的影响——基于数值模拟的洞察

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60285-0

Fu-qiang GAO, Hong-pu KANG

{"title":"Effect of pre-tensioned rock bolts on stress redistribution around a roadway—insight from numerical modeling","authors":"Fu-qiang GAO, Hong-pu KANG","doi":"10.1016/S1006-1266(08)60285-0","DOIUrl":"https://doi.org/10.1016/S1006-1266(08)60285-0","url":null,"abstract":"<div><p>The importance of the pre-tensioned force of rock bolts has been recognized by more and more researchers. To investigate the effect of pre-tensioned rock bolts on stress redistribution around roadways, a numerical analysis was carried out using FLAC3D and a special post-process methodology, using surfer, is proposed to process the numerical simulation results. The results indicate that pre-tensioned rock bolts have a significant effect on stress redistribution around a roadway. In the roof, pre-tensioned rock bolts greatly increase vertical stress; as a result, the strength of the rock mass increased significantly which results in a greater capacity of bearing a large horizontal stress. The horizontal stress decreases in the upper section of the roof, indicating that pre-tensioned rock bolts significantly reduce the coefficient and the size of the region concentration of horizontal stress. At the lateral side, pre-tensioned rock bolts greatly increase the horizontal stress; therefore, the rock mass strength significantly increases which results also in a greater capacity of bearing a large vertical stress. The greater the size of pre-tensioned force, the larger the region of stress redistribution around a roadway is affected and the higher the size of the stress on the roadway surface the more the rock mass strength increases.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 509-515"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60285-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91657363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

Dynamic characteristics of conveyor belts 输送带的动态特性

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60307-7

You-fu HOU, Qing-rui MENG

引用次数: 61

Sedimentation behavior of indoor airborne microparticles 室内空气微粒的沉降行为

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60300-4

Ming LI, Chao WU, Wei PAN

{"title":"Sedimentation behavior of indoor airborne microparticles","authors":"Ming LI, Chao WU, Wei PAN","doi":"10.1016/S1006-1266(08)60300-4","DOIUrl":"10.1016/S1006-1266(08)60300-4","url":null,"abstract":"<div><p>Experiments on the behavior of airborne microparticle sediments and their adhesion on glass slides were conducted in a laboratory located on the first floor of a teaching building. Clean tiles and glass slides were placed at different angles (0°, 45° and 90°) with respect to the horizontal plane in the laboratory. The sedimentation of microparticles was investigated at certain time intervals (1 d, 3 d, 10 d and 30 d). The results of testing, at day 30, show that the diameters of particles on the horizontal tiles varied from 20 to 80 μm; few particles with diameter less than 0.5 μm or greater than 100 μm were found. The amount of particle sediment on all the slides increased along over time, while the average diameter of particles was not correlated with time, nor with the angle of placement. The maximum particle size, the total particle surface area, the total perimeter of all particles and the cover ratio of light (the proportion of total area of particles to the observed area of the slides surfaces) did not change significantly within the first 10 days. Inspection of all the samples for the last 20 days, however, showed that these variables increased substantially with the passage of time and were in reverse proportion to the placement angles, which indicates a concentration of particles, as well as physical and chemical changes.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 588-593"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60300-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74225417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Theory and technology of preventing water from flooding roadways 道路防水理论与技术

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60283-7

Sheng-gen CAO, Shi-song HOU, Zhong-hua LI

引用次数: 2

Research on super-low-ash anthracite preparation 超低灰无烟煤制备研究

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60298-9

Yu-ling WANG, Yue-min ZHAO, Jian-guo YANG

引用次数: 6