Geosystem Engineering最新文献_第9页

Experiments of Sand Distribution among Perforation Clusters in a Horizontal Pipe 水平管射孔簇间砂粒分布的实验研究

IF 1.7

Geosystem Engineering Pub Date : 2020-11-23 DOI: 10.1080/12269328.2020.1851307

Ting Li, Qi Yang, Faraj A. Ahmad, J. Miskimins, Shaoming Li

{"title":"Experiments of Sand Distribution among Perforation Clusters in a Horizontal Pipe","authors":"Ting Li, Qi Yang, Faraj A. Ahmad, J. Miskimins, Shaoming Li","doi":"10.1080/12269328.2020.1851307","DOIUrl":"https://doi.org/10.1080/12269328.2020.1851307","url":null,"abstract":"ABSTRACT Multistage horizontal fracturing is the key technique in developing shale gas reservoirs. Although the parameters of perforation clusters are almost the same in each stage, production from each perforation cluster is vastly different. One of the factors that influences gas production between perforation clusters is the uneven proppant distribution among perforation clusters. In order to investigate proppant distribution among perforation clusters, the theory on proppant settling along horizontal lateral is presented to calculate the minimal critical velocity. Meanwhile, experiments on 20/40 and 40/70 mesh sand distribution with different concentrations were conducted at different pumping rates utilizing slick water fluids. The experimental parameters of perforation cluster, such as perforation density, length, and distance between clusters are scaled to simulate the actual treatment in shale gas fracturing. Therefore, the experimental results in this study can represent the actual distribution of proppants among perforation clusters. The results are analyzed, and some conclusions are presented. Pumping rate and viscosity are the two important factors that can have a big impact on the sand distribution. At a lower pumping rate, more sand was deposited at the first perforation cluster, whereas at a high pumping rate, more sand was deposited at the third cluster. The viscosity of slick water will also affect sand distribution largely. At a low fluid viscosity, sand distribution was varied much among clusters at the same pumping rate, and sand tended to distribute evenly when the fluid viscosity is increased. Therefore, in order to distribute proppants evenly among perforation clusters, the treatment parameters such as the pumping rate or the viscosity of slick water fluid can be adjusted accordingly.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1851307","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45740203","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: 0

Modelling temperature distributions and flow conditions of fires in an underground mine drift 地下矿井巷道火灾温度分布及流动条件模拟

IF 1.7

Geosystem Engineering Pub Date : 2020-11-01 DOI: 10.1080/12269328.2018.1429954

R. Hansen

{"title":"Modelling temperature distributions and flow conditions of fires in an underground mine drift","authors":"R. Hansen","doi":"10.1080/12269328.2018.1429954","DOIUrl":"https://doi.org/10.1080/12269328.2018.1429954","url":null,"abstract":"Abstract An analysis on the modelling of fire gas temperatures and fire gas velocities in a mine drift with longitudinal ventilation is conducted. A computational fluid dynamics (CFD) model and a number of empirical correlations are validated against the results from two full-scale fire experiments in a mine drift. During the analysis it is found that the upper level (ceiling) fire gas temperature at 35 and 50 m from the fire is well fitted when comparing the results from the CFD modelling with the experimental results. The fire gas temperatures at the lower level are found to be over predicted by the CFD model. The ceiling fire gas temperatures directly above the vehicles are over predicted in one case and under predicted in the other case by the CFD model. The empirical models are found to over predict the average fire gas temperature during extensive parts of the fires. The fire gas velocities at the higher section are found to be under predicted and the fire gas velocities at the lower section are over predicted by the CFD model. Future studies should be aimed at developing empirical models for mining applications as well as validating developed CFD models.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2018.1429954","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48396706","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: 5

Application of geochemical modelling for hydraulic stimulation in enhanced geothermal systems 地球化学模型在强化地热系统水力增产中的应用

IF 1.7

Geosystem Engineering Pub Date : 2020-10-14 DOI: 10.1080/12269328.2020.1832923

Junbeum Lee, E. Chung

引用次数: 3

Paleoenvironmental changes of source rocks from the Carboniferous to Permian sediments of the Mahu Sag, Junggar Basin, China 准噶尔盆地马湖凹陷石炭-二叠系烃源岩古环境变化

IF 1.7

Geosystem Engineering Pub Date : 2020-08-04 DOI: 10.1080/12269328.2020.1802354

Chong Feng, M. Ma, Wenjun He, Teng Li, Qiuyu Wu, Ze Zhang, H. Zhao

{"title":"Paleoenvironmental changes of source rocks from the Carboniferous to Permian sediments of the Mahu Sag, Junggar Basin, China","authors":"Chong Feng, M. Ma, Wenjun He, Teng Li, Qiuyu Wu, Ze Zhang, H. Zhao","doi":"10.1080/12269328.2020.1802354","DOIUrl":"https://doi.org/10.1080/12269328.2020.1802354","url":null,"abstract":"ABSTRACT There are four sets of source rocks from Carboniferous (C) to Permian in Mahu Sag, and the paleoenvironment is the decisive factor for the differences of source rocks. In order to study the controlling effect of paleoenvironmental evolution on the change of source rock properties, the major, trace elements and the total organic carbon (TOC) of 47 core samples from four sets of source rocks were tested. The results indicate that the paleoenvironmental evolution of these four sets of source rocks from C to Permian in Mahu Sag can be divided into five stages. At the end of C and the early stage of deposition of Wuerhe formation (P2w), the paleo climate became warm and humid, and the salinity of water body became small. Meanwhile, the oxidizability of water body gradually became stronger. At the deposition stage of Jiamuhe Formation (P1j), Fengcheng Formation (P1f) and the late stage of deposition of P2w, the paleo climate gradually became hot and dry, and the salinity of water body gradually increased. Meanwhile, the reducibility of water body became stronger. The paleoenvironmental factors controlling the abundance of organic matter in source rocks are different in different stages.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1802354","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49489832","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: 3

Mechanical behaviour of rock subjected to uniaxial compression at intermediate strain rate 中等应变速率下单轴压缩岩石的力学行为

IF 1.7

Geosystem Engineering Pub Date : 2020-07-29 DOI: 10.1080/12269328.2020.1799438

Y. Wicaksana, S. Jeon

引用次数: 3

Indications of the sedimentary environments by the sedimentary characteristics and trace elements of Ordovician Majiagou Formation, Northern Shaanxi salt basin 陕北盐盆地奥陶系马家沟组沉积特征及微量元素指示沉积环境

IF 1.7

Geosystem Engineering Pub Date : 2020-06-16 DOI: 10.1080/12269328.2020.1778545

Linlin Wang, Tao Shi, Dawei Chang, Haitao Zhang

{"title":"Indications of the sedimentary environments by the sedimentary characteristics and trace elements of Ordovician Majiagou Formation, Northern Shaanxi salt basin","authors":"Linlin Wang, Tao Shi, Dawei Chang, Haitao Zhang","doi":"10.1080/12269328.2020.1778545","DOIUrl":"https://doi.org/10.1080/12269328.2020.1778545","url":null,"abstract":"ABSTRACT The abundant geochemical information on elements in the autogenous sedimentary rocks can help reconstruct the paleoenvironment of the stratigraphic sedimentation period. Based on the analysis of sedimentary characteristics of Ordovician Majiagou Formation and the trace elements in limestone, dolomite and gypsum rocks in Northern Shaanxi salt basin, the relationship between the distribution of trace elements of Majiagou Formation and the sedimentary environment is discussed. The results display that Majiagou Formation is mainly composed of the sedimentation of carbonate rocks and evaporites, and the subfacies of open platform and restricted platform are developed. The trace element analysis shows that the deposition period of the Majiagou Formation is dominated by dry hot climate, and there are alternating dry and wet seasons in climate evolution. In middle Ordovician, the sedimentary environment of Majiagou Formation was undergoing the transformation of oxygen enrichment-oxygen deficiency-anoxic environment.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1778545","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45155739","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: 0

Smooth model of blasting seismic wave signal denoising based on two-stage denoising algorithm 基于两阶段去噪算法的爆破地震波信号平滑去噪模型

IF 1.7

Geosystem Engineering Pub Date : 2020-06-16 DOI: 10.1080/12269328.2020.1778543

Miao Sun, Li Wu, Chunjun Li, Qing Yuan, Yuchun Zhou, Xu Ouyang

{"title":"Smooth model of blasting seismic wave signal denoising based on two-stage denoising algorithm","authors":"Miao Sun, Li Wu, Chunjun Li, Qing Yuan, Yuchun Zhou, Xu Ouyang","doi":"10.1080/12269328.2020.1778543","DOIUrl":"https://doi.org/10.1080/12269328.2020.1778543","url":null,"abstract":"ABSTRACT In this paper, a two-stage denoising algorithm is proposed. Complementary ensemble empirical mode decomposition based on permutation entropy (CEEMD-PE) is carried out for the noisy monitoring signal in the first stage. Several denoising models are established according to the intrinsic mode function obtained by CEEMD-PE. An objective function considers both the smoothness of the denoising model and the similarity between the denoising model and the noisy monitoring signal is established, and the second stage denoising is realized by solving the objective function. The denoising model corresponding to the optimal solution of the objective function is the smooth denoising model. In order to verify the correctness of the two-stage denoising algorithm, the mixed simulation signal with noise is denoised, and based on the definition of signal-to-noise ratio, the effect of two-stage denoising is calculated. Finally, the algorithm is applied to the actual blasting seismic signal denoising processing. It is found that the proposed algorithm can not only reduce the noise interference but also retain the real part of the original signal while filtering the noise.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1778543","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46791267","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: 3

Metal pollution assessment of surface water from the abandoned Pb mine Zaida, high Moulouya-Morocco 摩洛哥莫罗亚高海拔Zaida废弃铅矿地表水金属污染评价

IF 1.7

Geosystem Engineering Pub Date : 2020-05-29 DOI: 10.1080/12269328.2020.1772125

Siham Bouzekri, M. L. El Hachimi, K. Kara, M. El Mahi, E. Lotfi

引用次数: 7

A review of calcined clays and ceramic wastes as sources for alkali-activated materials 煅烧粘土和陶瓷废料作为碱活性材料来源的研究进展

IF 1.7

Geosystem Engineering Pub Date : 2020-05-20 DOI: 10.1080/12269328.2020.1768154

N. Rakhimova

{"title":"A review of calcined clays and ceramic wastes as sources for alkali-activated materials","authors":"N. Rakhimova","doi":"10.1080/12269328.2020.1768154","DOIUrl":"https://doi.org/10.1080/12269328.2020.1768154","url":null,"abstract":"ABSTRACT Expanding and optimising the raw materials base in accordance with increasing ecological and technical requirements is one of the determining factors of a promising future for the constantly evolving alkali-activated materials (AAMs). Because of the development of the chemistry of the inorganic materials, the range of potentially suitable aluminosilicates has changed and expanded continuously throughout the history of AAMs. Relatively recently, efforts to find more types of adequate, alternative aluminosilicate sources, in addition to conventional granulated blast furnace slag, fly ash, and metakaolin, have led to extensive studies that have substantially increased understanding around the suitability of various natural sources and wastes for production of AAMs. In recent decades, calcined clays and ceramic wastes have become significant as an alumino-silicate sources for AAMs. Extensive research forms the theoretical and practical bases for the application of calcined clays, which are diverse in composition and structure, for effective cement production. This paper reviews recent developments in the field of alkali-activated cement-based systems using calcined clays containing different amounts of 1:1 and/or 2:1 type clay and secondary minerals, and ceramic wastes, including their suitability aspects, processing features, chemical reactivities, controlling factors, potential for application.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1768154","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44699364","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: 14

Influence of thiourea synthesis with silica fume on the corrosion rate of reinforcement concrete 硅灰合成硫脲对钢筋混凝土腐蚀速率的影响

IF 1.7

Geosystem Engineering Pub Date : 2020-05-03 DOI: 10.1080/12269328.2019.1660235

T. A. Tawfik, Magdy A. El-Yamani, A. Serag Faried, Shimaa M. Mohammed, Ghada M. Abdel-Hafez

{"title":"Influence of thiourea synthesis with silica fume on the corrosion rate of reinforcement concrete","authors":"T. A. Tawfik, Magdy A. El-Yamani, A. Serag Faried, Shimaa M. Mohammed, Ghada M. Abdel-Hafez","doi":"10.1080/12269328.2019.1660235","DOIUrl":"https://doi.org/10.1080/12269328.2019.1660235","url":null,"abstract":"ABSTRACT The examination of corrosion rate for steel reinforcement existent in concrete was carried out in the presence of silica fume and thiourea. The ordinary Portland cement (OPC) replacement was conducted with silica fume material at 5 and 10% by cement weight for concrete production, in addition to that using various percentage of thiourea (1, 2, 3 4 and 5%) added to concrete. Monitoring and estimating the corrosion rate for reinforcing steel existent in concrete with and without silica fume and thiourea was held with the usage of corrosion test cell. Besides, compressive and splitting tensile strength submerged in fresh and salty water of hardened concrete with and without silica fume and thiourea that were considered in the study. The immersion for all the samples of steel reinforcement with salty water (tap water with 1.5% of calcium sulphate and 3% of sodium chloride) for about 90 days of exposure were studied. The best results for the lowest corrosion rate were obtained when a mixture of silica fume with thiourea is used with concentrations of 10 and 3%, respectively compared with the ordinary concrete.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2019.1660235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48398621","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: 0