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Journal articles on the topic 'Method of the effective permeability'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Zhang, Xiaolong, Jianjun Liu, and Jiecheng Song. "Optimization Algorithm of Effective Stress Coefficient for Permeability." Energies 14, no. 24 (2021): 8345. http://dx.doi.org/10.3390/en14248345.

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The effective stress coefficient for permeability is a significant index for characterizing the variation in permeability with effective stress. The realization of its accuracy is essential for studying the stress sensitivity of oil and gas reservoirs. The determination of the effective stress coefficient for permeability can be mainly evaluated using the cross-plotting or response surface method. Both methods preprocess experimental data and preset a specific function relation, resulting in deviation in the calculation results. To improve the calculation accuracy of the effective stress coeff

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2

Zhiming, Wang, Yang Gang, and Zhang Jian. "A New Coal Permeability Prediction Method Based on Experiment and Dimension Analysis." SPE Journal 19, no. 03 (2013): 356–60. http://dx.doi.org/10.2118/162940-pa.

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Summary This paper aims to investigate the effect of temperature and effective stress on coal permeability. Through the experiment, we find a reversal phenomenon in which the coal permeability presents different change trends as temperature increases at two sides of the reverse point. The term “critical effective stress” refers to the effective stress at the reverse point. When effective stress is lower than the critical effective stress, the outward expansion effect of the coal block caused by grain and gas swell is greater than compaction effect as temperature increases under low effective s

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3

Zhang, Jilin Jay, Hui-Hai Liu, and Jewel Duncan. "An Efficient Laboratory Method to Measure Stress-Dependent Tight Rock Permeability With the Steady-State Flow Method." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 63, no. 5 (2022): 604–13. http://dx.doi.org/10.30632/pjv63n5-2022a3.

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The matrix permeability of tight formations is important for many geological and engineering applications, such as CO2 geological sequestration, disposal of nuclear waste, and production of unconventional hydrocarbon and coalbed methane. In the case of hydrocarbon production, the reservoir permeability decreases with decreasing pore pressure or increasing effective stress. Laboratory characterization of the relationship between matrix permeability and effective stress (and pore pressure) is generally time consuming since the current methods are based on the so-called point-by-point approach th

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4

Krivoshchekov, Sergey, Alexander Kochnev, Nikita Kozyrev, Andrey Botalov, Olga Kochneva, and Evgeny Ozhgibesov. "Rock Typing Approaches for Effective Complex Carbonate Reservoir Characterization." Energies 16, no. 18 (2023): 6559. http://dx.doi.org/10.3390/en16186559.

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For highly heterogeneous complex carbonate reef reservoirs, rock typing with respect to depositional conditions, secondary processes, and permeability and porosity relationships is a useful tool to improve reservoir characterization, modeling, prediction of reservoir volume properties, and estimation of reserves. A review of various rock typing methods has been carried out. The basic methods of rock typing were applied to a carbonate reservoir as an example. The advantages and disadvantages of the presented methods are described. A rock typing method based on a combination of hydraulic flow un

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5

Nurcahya, Ardian, Aldenia Alexandra, Fadhillah Akmal, and Irwan Ary Dharmawan. "The Lattice Boltzmann Method and Image Processing Techniques for Effective Parameter Estimation of Digital Rock." Applied Sciences 14, no. 17 (2024): 7509. http://dx.doi.org/10.3390/app14177509.

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Several numerical simulations of fluid flow were performed using the Lattice Boltzmann method and image processing techniques to estimate the effective properties of 2-D porous rocks. The effective properties evaluated were the physical characteristics that allow fluid flow including the effective porosity, permeability, tortuosity, and average throat size to determine the storage and transport of fluids in porous rocks. The permeability was compared using the Darcy model simulation and the empirical Kozeny–Carman Equation. The results showed that the Lattice Boltzmann method and image process

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6

Wei, Xi. "The Research of Production Split Using Well Logging and Well Testing Method." Advanced Materials Research 915-916 (April 2014): 1438–42. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.1438.

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The most popular method to split the production is mainly based on permeability and effective thickness of reservoir. In this general method, the permeability comes from the well logging interpretation. But this permeability can not reflect the flow characteristics of real fluid in the reservoir. In this paper, a new production split method is proposed considering the well logging method, the well test method and relative permeability curve. It is proved to be reliable and effective after cases study. It is worth to promote in oilfields.

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Wang, Ke Liang, Jin Yu Li, Lei Lei Zhang, Xue Li, Guo Qiang Fu, and Wei Liang Li. "Injection Method of SJT-B Collosol in the Low Permeability Reservoir." Applied Mechanics and Materials 694 (November 2014): 340–45. http://dx.doi.org/10.4028/www.scientific.net/amm.694.340.

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Profile control and flooding technique is an effective way to enhance the oil recovery of low permeability reservoir.Analyzing the relation between oil and water interface and determining injection volume under different concentration is the key to success in profile controlling and flooding in low permeability reservoir .The research is about SJT-B collosol of physicochemical property under normal pressure and temperature.We also carry on the study on measuring SJT-B collosol interfacial tension for a long time under different concentration.Besides, we conduct the plugging degree experiment b

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8

Fu, Yan, Lian-jing Xia, HU Shuo, et al. "The invention relates to a method for simulating phase permeability curve based on conventional logging data." Journal of Physics: Conference Series 2834, no. 1 (2024): 012024. http://dx.doi.org/10.1088/1742-6596/2834/1/012024.

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Abstract Phase permeability curve is the curve of relative permeability (effective permeability/oil phase permeability in bound water) and water saturation change obtained through core phase permeability experiment. It is an indispensable data in oilfield development calculation, dynamic analysis, determination of oil-water saturation distribution in reservoirs and other water-driven oil related calculations, and an important index for reservoir evaluation. The study of effective permeability and relative permeability is of great significance for controlling the uniform advance of oil-water or

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9

Bi, Cai-Qin, Xiao-Lin Xin, Shuang Liu, Cheng-Zheng Cai, and Zheng-Chao Zhu. "Experimental analysis and model study on effective stress sensitivity of coal rock permeability." Thermal Science 29, no. 2 Part B (2025): 1545–50. https://doi.org/10.2298/tsci2502545b.

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Using the unsteady pressure drop method, permeability measurements of coal samples were conducted across various bedding directions under different effective stresses. Mercury injection, SEM, and micro-CT techniques were employed to analyze pore/fracture structures. By integrating experimental data, existing stress-sensitive permeability models were validated and refined. The results demonstrated that gas permeability in cores from different directions exponentially correlates with effective stress. During decompression, the permeability exhibited limited recovery and irreversible damage. Stre

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10

Gulbahar Mammadova, Elgun Gajar, Gulbahar Mammadova, Elgun Gajar. "EFFECTIVE ANALYSIS OF SAND PLUG WASHING IN WELLS." PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 40, no. 05 (2024): 429–39. http://dx.doi.org/10.36962/pahtei40052024-429.

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In order to expedite the removal of sand-mud mixture from the bottom of the well, efficient pumping methods are employed. The basis of washing out the sand plug with mud lies in dispersing the plug with washing mud and lifting it to the surface with mud flow. In field practice, straight, reverse, and combined pumping methods are used. In the straight pumping method, washing mud is injected into the well bottom with a washing pipe string, and the sand plug is dispersed with a mud jet. The sand-mud mixture is then lifted to the surface by gas lift. In the reverse pumping method, washing mud is i

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11

Sun, Xiang, Hao Luo, and Kenichi Soga. "Deformation Coupled Effective Permeability Change in Hydrate-Bearing Sediment during Depressurization." Processes 10, no. 11 (2022): 2210. http://dx.doi.org/10.3390/pr10112210.

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Methane hydrates found in the sediments of deep sea and permafrost regions draw global interest. The rate of gas production from a depressurized well is governed by the effective permeability of the hydrate-bearing sediments around the wellbore. During depressurization, a decrease in pore pressure leading to soil compaction and hydrate dissociation results in a dynamic change in the effective permeability. To describe the change in the effective permeability in detail, in this study, a simple coupled compressibility–permeability analysis method is proposed to identify the conditions under whic

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12

Ding, Yuandong. "Research on the Effective Scope of Low-permeability Hard Coalbed Coupling and Enhanced Permeability Technology." Architecture Engineering and Science 5, no. 4 (2025): 222. https://doi.org/10.32629/aes.v5i4.3211.

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Due to poor gas permeability, high gas content, and hard coal quality at the JiuLiShan coal mine, gas extraction is difficult, and hydraulic perforation has limited effect. This study proposes a permeability enhancement method combining loosening blasting and hydraulic perforation to improve coal seam gas permeability and extraction efficiency. Field tests confirm the technology's effectiveness, showing that the combined method significantly enhances the coal body's permeability. The effective influence radius of the 1# test group (small explosives) is 4-6m, while the 2# test group (large expl

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13

Pang, Y., M. Y. Soliman, H. Deng, and Hossein Emadi. "Analysis of Effective Porosity and Effective Permeability in Shale-Gas Reservoirs With Consideration of Gas Adsorption and Stress Effects." SPE Journal 22, no. 06 (2017): 1739–59. http://dx.doi.org/10.2118/180260-pa.

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Summary Nanoscale porosity and permeability play important roles in the characterization of shale-gas reservoirs and predicting shale-gas-production behavior. The gas adsorption and stress effects are two crucial parameters that should be considered in shale rocks. Although stress-dependent porosity and permeability models have been introduced and applied to calculate effective porosity and permeability, the adsorption effect specified as pore volume (PV) occupied by adsorbate is not properly accounted. Generally, gas adsorption results in significant reduction of nanoscale porosity and permea

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14

Cramer, David D., and Mark A. Songer. "Batch-Mix Fracturing: An Effective Method of Stimulating Moderate-Permeability Reservoirs." SPE Production Engineering 5, no. 04 (1990): 461–68. http://dx.doi.org/10.2118/17500-pa.

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15

McCarthy, J. F. "Effective permeability of sandstone-shale reservoirs by a random walk method." Journal of Physics A: Mathematical and General 23, no. 9 (1990): L445—L451. http://dx.doi.org/10.1088/0305-4470/23/9/008.

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16

Sekhar, A. C., Benny Mathews Abraham, T. G. Santhosh Kumar, and A. Sridharan. "Grouting - an effective method for reducing the permeability of sandy soils." International Journal of Hydrology Science and Technology 18, no. 1 (2024): 57–76. http://dx.doi.org/10.1504/ijhst.2024.139405.

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17

Teimoori, Ahmad, Zhixi Chen, Sheik S. Rahman, and Thanh Tran. "Effective Permeability Calculation Using Boundary Element Method in Naturally Fractured Reservoirs." Petroleum Science and Technology 23, no. 5-6 (2005): 693–709. http://dx.doi.org/10.1081/lft-200033029.

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18

Sridharan, A., A. C. Sekhar, Benny Mathews Abraham, and T. G. Santhosh Kumar. "Grouting - an effective method for reducing the permeability of sandy soils." International Journal of Hydrology Science and Technology 1, no. 1 (2023): 1. http://dx.doi.org/10.1504/ijhst.2023.10055876.

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19

B. Alsinbili, Mohammed, Sameer N. Aljawad, and Ammar Awni Aldalawy. "Permeability Prediction of Un-Cored Intervals Using FZI Method and Matrix Density Grouping Method: A Case Study of Abughirab Field/Asmari FM., Iraq." Iraqi Journal of Chemical and Petroleum Engineering 14, no. 4 (2013): 27–34. http://dx.doi.org/10.31699/ijcpe.2013.4.4.

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Knowledge of permeability is critical for developing an effective reservoir description. Permeability data may be calculated from well tests, cores and logs. Normally, using well log data to derive estimates of permeability is the lowest cost method. This paper will focus on the evaluation of formation permeability in un-cored intervals for Abughirab field/Asmari reservoir in Iraq from core and well log data. Hydraulic flow unit (HFU) concept is strongly related to the flow zone indicator (FZI) which is a function of the reservoir quality index (RQI). Both measures are based on porosity and pe

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20

Zhou, Mei, Faning Dang, Jiulong Ding, Le Zhang, and Xinyu Liang. "Investigation on Calculation Method of Permeability Coefficient in the Consolidation Process of Cohesive Soil." Geofluids 2022 (July 16, 2022): 1–10. http://dx.doi.org/10.1155/2022/2326573.

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In order to study the permeability characteristics of cohesive soil in the consolidation process more accurately, in this work, the pores occupied by the combined water were defined as invalid pores, and the effective pores and ineffective pores were decoupled to study the relationship between effective pores and permeability coefficient. The widely used empirical formulas of the permeability coefficient were modified, and the empirical formulas of the permeability coefficient suitable for the consolidation process of cohesive soil were obtained. Combined with the e − lg σ relationships of nor

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21

Nœtinger, Benoît. "Computing the effective permeability of log-normal permeability fields using renormalization methods." Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 331, no. 5 (2000): 353–57. http://dx.doi.org/10.1016/s1251-8050(00)01412-9.

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22

Cong, Lin, Shi Zhong Ma, Wen Long Li, and Yan Cong. "Study on Physical Property Lower Limit of Effective Reservoir of Deep Layer in Qingshui-Yuanyang Area." Advanced Materials Research 616-618 (December 2012): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.104.

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Synthetically using the empirical statistic method, porosity—permeability intersection method minimum flow pore throat radius method and oil test method. We can seek for the physical property lower limit of different depth of deep reservoirs of Yuan Yang Gou. According to liner regression, we achieved the functional equation which shows functional relationship between physical property lower limit and depth. At the same time, we also talk about the characteristics of different methods and the control factors of physical property lower limit The results show that although the methods have advan

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23

Pang, Mingkun, Tianjun Zhang, Lu Gao, and Binfeng Qin. "Investigating the effects of effective stress on pore-dependent permeability measurements of crushed coal." PLOS ONE 16, no. 12 (2021): e0261678. http://dx.doi.org/10.1371/journal.pone.0261678.

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The accurate determination of permeability is one of the parameters essential for the study of fluid flow and transport state. However, a large number of fractured coal bodies are faced during the production of coal mines. The study of permeability of these special media composed of grains of a certain size, whose structure is different from that of raw coal, has been in the exploratory stage. In this paper, inspired by the calculation method of median particle size and the calculation principle of KC’s equation, we calculate the permeability parameters of broken coal particles. It is consider

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24

Zhang, Zhenying, Yingfeng Wang, Hui Xu, Yuehua Fang, and Dazhi Wu. "Influence of effective stress and dry density on the permeability of municipal solid waste." Waste Management & Research: The Journal for a Sustainable Circular Economy 36, no. 5 (2018): 471–80. http://dx.doi.org/10.1177/0734242x18763520.

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A landfill is one of the main sites for disposal of municipal solid waste and the current landfill disposal system faces several problems. For instance, excessive leachate water is an important factor leading to landfill instability. Understanding the permeability characteristics of municipal solid waste is a relevant topic in the field of environmental geotechnical engineering. In this paper, the current research progress on permeability characteristics of municipal solid waste is discussed. A review of recent studies indicates that the research in this field is divided into two categories ba

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25

Feng, Yapeng. "Experimental Study on The Influence of Effective Stress on Stress Sensitivity of Coal Permeability." International Journal of Natural Resources and Environmental Studies 2, no. 1 (2024): 37–43. http://dx.doi.org/10.62051/ijnres.v2n1.04.

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In order to study the influence of effective stress on the sensitivity of coal permeability stress, three groups of low permeability dense coal samples were selected in the range of confining pressure of 2 MPa ~ 4 MPa. Under the influence of single factor of effective stress, the cross-contrast seepage experiment of coal samples under different effective stress conditions was carried out by using steady seepage method, and the variation characteristics of effective stress sensitivity of coal samples were systematically analyzed by using permeability damage rate and permeability curvature. The

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26

Matsuzaki, Ryosuke, Tomohiro Ishikawa, Tomonaga Okabe, Yutaka Oya, and Shigeki Yashiro. "Stiffness and permeability multi-objective optimization of carbon-fiber-reinforced plastic mesostructures using homogenization method." Journal of Composite Materials 53, no. 13 (2018): 1865–80. http://dx.doi.org/10.1177/0021998318812160.

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This paper presents a stiffness and permeability multi-objective optimization method for carbon-fiber-reinforced plastic mesostructures based on a homogenization method. To reduce the computational cost of dealing with multiple design variables for complicated fiber mesostructures, we generate and extract effective design variables from optimization results derived from a smaller number of design variables. We applied the proposed method to optimization of the in-plane and out-of-plane stiffness and permeability of non-crimp fabrics. The optimization results showed that the application of effe

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Ran, Guoliang, Yanpeng Zhu, Xiaohui Yang, Anping Huang, and Dong Chen. "Permeability Characteristics of Improved Loess and Prediction Method for Permeability Coefficient." Applied Sciences 14, no. 17 (2024): 8072. http://dx.doi.org/10.3390/app14178072.

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Due to its unique geotechnical properties, loess presents itself as a cost-effective and energy-efficient material for engineering construction, aiding in cost reduction and environmental sustainability. However, to meet engineering specifications, loess often requires enhancement. Evaluating its permeability properties holds significant importance for employing improved loess for construction materials in landfills and artificial water bodies. This study investigates the influence of dry densities, grain size characteristics, grain size distribution, and admixture contents and types on the pe

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Selvadurai, A. P. S., and P. A. Selvadurai. "Surface permeability tests: experiments and modelling for estimating effective permeability." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2122 (2010): 2819–46. http://dx.doi.org/10.1098/rspa.2009.0475.

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This paper presents a technique for determining the near surface permeability of geomaterials and involves the application of a uniform flow rate to an open central region of a sealed annular patch on an otherwise unsealed flat surface. Darcy’s flow is established during attainment of a steady pressure at a constant flow rate. This paper describes the experimental configuration and its theoretical analysis via mathematical and computational techniques. The methods are applied to investigate the surface permeability characteristics of a cuboidal block of Indiana limestone measuring 508 mm. An i

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29

Zhang, Hairong, Bin Zhao, Shiqi Dong, Xixin Wang, and Pengfei Jing. "A Method for the Inversion of Reservoir Effective Permeability Based on Time-Lapse Resistivity Logging Data and Its Application." Geofluids 2022 (April 22, 2022): 1–13. http://dx.doi.org/10.1155/2022/8704344.

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Effective permeability is a key parameter for evaluating reservoirs and their productivity. With the wide application of resistivity logging tools in drilling, the advantages of resistivity logging in response to the dynamic invasion process of drilling fluids have become increasingly prominent. We analyzed the variation law of the measured resistivity data for different permeability formations at different times. In this study, we proposed an effective permeability modeling method based on the time-lapse resistivity logging data. First, based on the resistivity measurement data at different t

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30

Li, Xiongyan. "Permeability Calculation of Complex Carbonate Reservoirs Based on Data Mining Techniques." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 64, no. 1 (2023): 92–106. http://dx.doi.org/10.30632/pjv64n1-2023a7.

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Due to the complexity of lithologies and pore types, the permeability calculation of complex carbonate reservoirs has always been a difficult problem. To accurately calculate the permeability of complex carbonate reservoirs, a data mining technique is introduced. The technical process of data mining is established and divided into seven steps: data warehousing, data preprocessing, classification of reservoir types, selection of sensitive parameters, establishment of the classification model, evaluation of classification model, and application of classification model. The data-driven method can

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31

Lv, Qiang, Ming Xiang Chen, Hui Cao, and Zhi Yin Gan. "An Effective Method for Bonding Carbon Nanotubes onto Metal Electrodes." Advanced Materials Research 403-408 (November 2011): 1099–102. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.1099.

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An effective method was used to bond carbon nanotubes onto metal electrodes by induction heating process. A good contact between carbon nanotubes and metal electrodes was formed. The contact resistance can be reduced to approximate 95% after induction heating process. Because the induction heating process will selective occur on the structures with high relative permeability and low electrical resistivity, this method could be utilized to realize large scale localized bonding.

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Yuliani, Ayu, Ordas Dewanto, Karyanto Karyanto, and Ade Yogi. "PREDIKSI PERMEABILITAS MENGGUNAKAN METODE LOG DAN PORE GEOMETRY STRUCTURE (PGS) PADA DAERAH CEKUNGAN JAWA BARAT UTARA." Jurnal Geofisika Eksplorasi 6, no. 1 (2020): 3–17. http://dx.doi.org/10.23960/jge.v6i1.57.

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Determination of reservoir rock properties is very important to be able to understand the reservoir better. One of these rock properties is permeability. Permeability is the ability of a rock to pass fluid. In this study, the calculation of permeability was carried out using log and PGS (Pore Geometry Structure) methods based on core data, logs, and CT scans. In the log method, the calculation of permeability is done by petrophysical analysis which aims to evaluate the target zone formation in the form of calculation of the distribution of shale content (effective volume), effective porosity,

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Wang, Yi, Hao Wang, Shangyi Qi, Shimin Liu, Yixin Zhao, and Wenting Yue. "Investigation of Shale Permeability Evolution considering Bivalued Effective Stress Coefficients for CO2 Injection." Geofluids 2021 (October 1, 2021): 1–11. http://dx.doi.org/10.1155/2021/1132440.

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Because of the existence of multiscale pores from nano- to macroscale, a multimechanistic shale gas flow process involving the Darcy and Knudsen flows occurs during gas shale well depletion. The respective contribution of the Darcy and Knudsen flows to the permeability is constantly changing with pressure evolution. In this study, laboratory measurements of shale permeability with CO2 injections were carried out under hydrostatic conditions, using the transient pulse-decay method. The “U”-shape permeability curve resulted in both positive and negative effective stress coefficients (Biot’s coef

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Ge, Yong, Jie Fan, Jie Yuan, Wen Cui Yang, Bao Sheng Zhang, and Ji Shou Yu. "Relation of Permeability by High Hydraulic Method and Chloride Ion Diffusion Coefficient of Concrete." Key Engineering Materials 405-406 (January 2009): 303–8. http://dx.doi.org/10.4028/www.scientific.net/kem.405-406.303.

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Permeation length, permeation coefficient of water permeated into concrete and chloride ion diffusion coefficient of C30, C45 and C60 concrete were studied by high hydraulic method (0.5MPa~25MPa) and quick method of testing chloride ion diffusion respectively, and relationship of concrete permeability tested by two methods was analyzed too. High hydraulic method can distinguish permeability of concrete with different strength or air content and it is a quick and effective method to fast test and evaluating permeability of concrete. The results showed that high hydraulic method is applicable fo

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Yan, Liang Dong, Zhi Juan Gao, and Feng Gang Dai. "Effective use Model of Low Permeability Oil Reservoir." Advanced Materials Research 753-755 (August 2013): 53–57. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.53.

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The throat of low permeability oil reservoir is narrow and small, the reservoir fluid flow resistance is big, and with the start-up pressure gradient, compare with medium and high permeability reservoir fluid flow, the characteristics are obviously different in performance for non-darcy flow at low speed. This kind of oil field reservoir started in the process of mining scope is small, the degree of use and the development effect is low. To solve these problems, this paper established considering start-up pressure gradient of the new unstable seepage flow mathematical model of non-darcy radial

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Xu, Yao, Lianlian Xu, Shuxia Qiu, Zhouting Jiang, Binqi Rao, and Peng Xu. "A Study on the Through-Plane Permeability of Anisotropic Fibrous Porous Material by Fractal Stochastic Method." Materials 15, no. 22 (2022): 8064. http://dx.doi.org/10.3390/ma15228064.

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The through-plane permeability is of great importance for understanding the transport phenomenon in anisotropic fibrous porous material. In this paper, a novel pore-scale model based on the equilateral triangle representative unit cell (RUC) and capillary bundle model is developed for the fluid flow through the anisotropic fibrous porous material according to fractal theory, and the effective through-plane permeability is presented accordingly. The digital structures of the fibrous porous material are generated by a fractal stochastic method (FSM), and the single-phase fluid flow through the 3

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Zhou, Sui Hua, Zhi Yi Chen, and Shi Min Feng. "Improvement Methods of Apparent Permeability of Ferromagnetic Core." Advanced Materials Research 712-715 (June 2013): 1876–80. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1876.

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The performance of induction coil magnetic sensors , which usually have large dimensions and heavy weights, is mainly decided by apparent permeability of the core. But flux concentrator is a effective equipment to improve apparent permeability of the core, which will hardly increase dimensions and weights of magnetic sensors. Firstly, mathematical equations of apparent permeability are explained and influencing factors are analysed. Then influencing degrees of different parameters of the flux concentrator are simulated by Maxwell 2D/3D. The results are shown as follows. (a) The larger diameter

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Malkovsky, Victor I., Andrey V. Zharikov, and Michael I. Ojovan. "Modification of Pulse Decay Method for Determination of Permeability of Crystalline Rocks." Inventions 8, no. 1 (2023): 14. http://dx.doi.org/10.3390/inventions8010014.

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An improvement of the pulse decay method of rock permeability measurement is presented. The technique is based on fitting experimental data to analytical and numerical solutions of the filtration equations derived with regard to the variation of flowing gas properties with temperature and pressure. A special apparatus and software for the implementation of this method were developed. A single experiment in which gas is used as a flowing medium enables determining both the permeability of a sample to water and the Klinkenberg constant. The permeability measurements on the samples of different t

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Glover, P. W., and E. Walker. "Grain-size to effective pore-size transformation derived from electrokinetic theory." GEOPHYSICS 74, no. 1 (2009): E17—E29. http://dx.doi.org/10.1190/1.3033217.

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Most permeability models use effective grain size or effective pore size as an input parameter. Until now, an efficacious way of converting between the two has not been available. We propose a simple conversion method for effective grain diameter and effective pore radius using a relationship derived by comparing two independent equations for permeability, based on the electrokinetic properties of porous media. The relationship, which we call the theta function, is not dependent upon a particular geometry and implicitly allows for the widely varying style of microstructures exhibited by porous

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Gao, Feiming, Liang Xiao, Wei Zhang, Weiping Cui, Zhiqiang Zhang, and Erheng Yang. "Low Permeability Gas-Bearing Sandstone Reservoirs Characterization from Geophysical Well Logging Data: A Case Study of Pinghu Formation in KQT Region, East China Sea." Processes 11, no. 4 (2023): 1030. http://dx.doi.org/10.3390/pr11041030.

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The Pinghu Formation is a low permeability sandstone reservoir in the KQT Region, East China Sea. Its porosity ranges from 3.6 to 18.0%, and permeability is distributed from 0.5 to 251.19 mD. The relationship between porosity and permeability was poor due to strong heterogeneity. This led to the difficulty of quantitatively evaluating effective reservoirs and identifying pore fluids by using common methods. In this study, to effectively evaluate low permeability sandstones in the Pinghu Formation of KQT Region, pore structure was first characterized from nuclear magnetic resonance (NMR) loggin

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Wang, Gang, Ke Wang, Yujing Jiang, and Shugang Wang. "Reservoir Permeability Evolution during the Process of CO2-Enhanced Coalbed Methane Recovery." Energies 11, no. 11 (2018): 2996. http://dx.doi.org/10.3390/en11112996.

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In this study, we have built a dual porosity/permeability model through accurately expressing the volumetric strain of matrix and fracture from a three-dimensional method which aims to reveal the reservoir permeability evolution during the process of CO2-enhanced coalbed methane (CO2-ECBM) recovery. This model has accommodated the key competing processes of mechanical deformation and adsorption/desorption induced swelling/shrinkage, and it also considered the effect of fracture aperture and effective stress difference between each medium (fracture and matrix). We then numerically solve the per

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Yan, Xinlu, Songhang Zhang, Shuheng Tang, et al. "A Comprehensive Coal Reservoir Classification Method Base on Permeability Dynamic Change and Its Application." Energies 13, no. 3 (2020): 644. http://dx.doi.org/10.3390/en13030644.

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Due to the unique adsorption and desorption characteristics of coal, coal reservoir permeability changes dynamically during coalbed methane (CBM) development. Coal reservoirs can be classified using a permeability dynamic characterization in different production stages. In the single-phase water flow stage, four demarcating pressures are defined based on the damage from the effective stress on reservoir permeability. Coal reservoirs are classified into vulnerable, alleviative, and invulnerable reservoirs. In the gas desorption stage, two demarcating pressures are used to quantitatively charact

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Wu, Xiao Feng, Guang Fan Li, and Wan Cheng He. "The Principle of Effective Stress Theory Research Based on Channel Rate." Applied Mechanics and Materials 275-277 (January 2013): 336–42. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.336.

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Based on the debate of effective stress principle applicability on cohesive soil in recent years and the predecessor's research achievements, this paper puts forward the idea that the effective stress surface including hydrated film surrounding soil particles. And we obtained the extended soil effective stress equation by establishment of the model of channel rate.Combined with the physical significance of permeability coefficient and substantial experimental data, it can establish the fitting equation between permeability coefficient and new proposed physical parameter channel rate. A new cal

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Tawfeeq, Yahya. "DIGITAL ROCK ANALYSIS: AN ALTERNATIVE METHOD TO PREDICT PETROPHYSICAL PROPERTIES, CASE STUDY FROM MISHRIF FORMATION." Iraqi Geological Journal 53, no. 2C (2020): 34–55. http://dx.doi.org/10.46717/igj.53.2c.4rs-2020-09-04.

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The digital core analysis of petrophysical properties replace the use of conventional core analysis by reducing the required time for investigation. Also, the ability to capture pore geometries and fluid behavior at the pore-scale improves the understanding of complex reservoir structures. In this work, 53 samples of 2D thin section petrographic images were used for analyses from the core plugs taken from the Buzurgan oil field. Each sample was impregnated with blue-dyed epoxy, thin sectioned and then was stained for discrimination of carbonate minerals. Each thin section has been described in

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Li, Jun, and Donald Brown. "Upscaled Lattice Boltzmann Method for Simulations of Flows in Heterogeneous Porous Media." Geofluids 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/1740693.

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An upscaled Lattice Boltzmann Method (LBM) for flow simulations in heterogeneous porous media at the Darcy scale is proposed in this paper. In the Darcy-scale simulations, the Shan-Chen force model is used to simplify the algorithm. The proposed upscaled LBM uses coarser grids to represent the average effects of the fine-grid simulations. In the upscaled LBM, each coarse grid represents a subdomain of the fine-grid discretization and the effective permeability with the reduced-order models is proposed as we coarsen the grid. The effective permeability is computed using solutions of local probl

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Syrtsova, D. A., A. Yu Alentiev, S. V. Chirkov, et al. "Method of Liquid-Phase Fluorination of Polymers to Increase the Selectivity of the Air Separation." Мембраны и мембранные технологии 13, no. 1 (2023): 42–55. http://dx.doi.org/10.31857/s2218117223010066.

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The one-sided modification of homogeneous polymer films of polyvinyltrimethylsilane (PVTMS), poly(2,6-dimethylphenyl-1,4 oxide) (PPO), and polybenzodioxane (PIM-1) was carried out by liquid-phase fluorination method using a fluorine-nitrogen mixture in perfluorodecalin. The fluorination time ranged from 10 to 60 min. For PPO films the amorphous and β-nanocrystalline phase (48%) was found by X-ray diffraction analysis of the original films. It was shown that fluorination does not significantly affect the degree of PPO crystallinity. The effect of fluorination time on the effective coefficients

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CAI, JIANCHAO, LIJUN YOU, XIANGYUN HU, JING WANG, and RONGHUA PENG. "PREDICTION OF EFFECTIVE PERMEABILITY IN POROUS MEDIA BASED ON SPONTANEOUS IMBIBITION EFFECT." International Journal of Modern Physics C 23, no. 07 (2012): 1250054. http://dx.doi.org/10.1142/s0129183112500544.

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Permeability is an important parameter for characterizing the transport properties (e.g. heat and mass transfer) of porous media. It is one of the crucial issues that the permeability of porous media is exactly and quickly decided in many fields such as reservoir engineering, groundwater engineering and composite material modeling. Spontaneous imbibition is a fundamental and ubiquitous natural phenomenon extensively existing in a variety of processes. In this paper, the relationships between the height and weight of imbibition versus the time are derived based on Darcy's law, and a simple meth

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Huang, Huazhou, Yuantao Sun, Xiantong Chang, Zhengqing Wu, Mi Li, and Shulei Qu. "Experimental Investigation of Pore Characteristics and Permeability in Coal-Measure Sandstones in Jixi Basin, China." Energies 15, no. 16 (2022): 5898. http://dx.doi.org/10.3390/en15165898.

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The research of pore and permeability characteristics of tight sandstone reservoirs in coal-measure is critical for coal-measure gas development. In this study, the pore systems of tight sandstones were studied based on low-field nuclear magnetic resonance (LF-NMR) data. The permeability of tight sandstones was obtained by the tester based on the pulse transient method. The permeability variation with the effective stress, grains, and pore characteristics was analyzed. The results show that the tight sandstone reservoirs in the coal-measure have low total porosity (2.80–4.14%), low effective p

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Csurgai, Péter, and Miklós Kuczmann. "Sensitivity calculation of LF RFID transponder coil by the mutual effective permeability method." Pollack Periodica 6, no. 2 (2011): 3–12. http://dx.doi.org/10.1556/pollack.6.2011.2.1.

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Sekiguchi, Takaho, Hiromu Odanaka, Yoshinobu Okano, and Satoshi Ogino. "Effective Loading Method of High- permeability Magnetic Sheet for NFC/WPT Hybrid Antenna." IEEJ Transactions on Electronics, Information and Systems 137, no. 6 (2017): 826–33. http://dx.doi.org/10.1541/ieejeiss.137.826.

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