Article
Energy & Fuels
C. C. Agoha, A. Opara, O. C. Okeke, C. N. Okereke, C. N. Onwubuariri, F. B. Akiang, L. J. Osaki, I. A. Omenikolo
Summary: The 3D geomechanical characterization of Fuja field reservoirs in the Niger Delta evaluated the mechanical properties of the reservoir rocks, showing that sandstone is less elastic and ductile compared to shale. The study generated geomechanical models that identified areas with minimal rock deformation, aiding in risk management during drilling and post-drilling activities. The results will be helpful in mitigating exploration and exploitation challenges for operators.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
H. Joshi, Tuan V. Vu, Nguyen N. Hieu, R. Khenata, D. P. Rai
Summary: An ab-initio density functional theory (DFT) method was utilized to investigate the elastic and thermodynamic properties of Fe2CoAl under hydrostatic pressure. It was found that the compound exhibits a mixture of covalent and ionic bonds, and shows ductility at all pressures considered, with various mechanical and dynamical properties showing linear changes under different applied pressures.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Nejc Novak, Olly Duncan, Tom Allen, Andrew Alderson, Matej Vesenjak, Zoran Ren
Summary: This study analyzed the shear moduli of conventional and auxetic open-cell polymer foams, finding that the measured shear moduli of auxetic foams were generally lower, and the calculated shear moduli were lower than the measured values.
MECHANICS OF MATERIALS
(2021)
Article
Environmental Sciences
Liu Yi-Sheng, Zhu Zheng-Ping, Pan Ren-Fang, Wu Hei-Zhi, Jin Ji-Neng
Summary: This article investigates the brittleness characteristics of high-quality shale reservoirs in Pengshui area of southeastern Chongqing and their impact on development. By analyzing and comparing rock physical parameters and mineral composition, a new formula for calculating the brittleness index is proposed, and the brittleness of the area is comprehensively evaluated.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Baoshan Song, Xiang-Yang Li, Pinbo Ding, Shuangquan Chen, Jianchao Cai
Summary: In this study, a new form of the Zoeppritz equation and P-to-P wave reflection coefficient is derived to estimate reservoir characterization and rock brittleness directly by density, Young's modulus, and Poisson's ratio. The proposed direct inversion method based on the iteratively regularized Levenberg Marquardt (IRLM) algorithm shows feasibility and high accuracy in estimating these parameters. The study has potential and valuable guidance for sweet spot evaluation, horizontal well deployment, and hydraulic fracturing.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Przemyslaw Michal Wilczynski, Andrzej Domonik, Pawel Lukaszewski
Summary: Laboratory studies were conducted on the strength-strain properties of shales in four siltstone-claystone lithostratigraphic units in the Baltic Basin. The orientation of the samples significantly influenced their mechanical properties, with samples oriented parallel to lamination exhibiting different characteristics from samples oriented perpendicular to lamination. The rocks studied exhibited VTI internal anisotropy, impacting their geomechanical properties.
Article
Chemistry, Physical
Huanxiong Xia, Junfeng Meng, Jianhua Liu, Xiaohui Ao, Shengxiang Lin, Ye Yang
Summary: This paper proposes a method to fast evaluate the equivalent mechanical properties of lattice structures by using a reduced-order model and analytical-fitting formulas. The relationship between material and structural parameters and the equivalent mechanical properties is investigated, and a series of fitting formulas are obtained for fast prediction.
Article
Materials Science, Multidisciplinary
Valentin A. Gorodtsov, Valentin G. Tkachenko, Dmitry S. Lisovenko
Summary: This study conducted theoretical and numerical analyses on the extreme values of Young's modulus for six and seven-constant tetragonal crystals based on experimental data, revealing their relationship with anisotropy coefficients and characteristics in different crystal structures.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Lichun Bian, Hao Li, Yong Cheng
Summary: A new molecular model is proposed in this paper to calculate the mechanical properties of carbon nanotubes. The expressions for surface Young's modulus, Poisson's ratio, shear modulus, and bulk modulus show that the mechanical properties of carbon nanotubes decrease with the increase of radius size.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Nanoscience & Nanotechnology
Snigdha S. Jagarlapudi, Heaven S. Cross, Tridip Das, William A. Goddard
Summary: Environmental and toxicity concerns necessitate the replacement of DEHP plasticizer with potential alternatives such as DHS, DEA, 1,4-BDB, and DBS for PVC. The comparison of their tensile, mechanical, and diffusional properties is crucial in determining their competitiveness. This study predicts the effects of these plasticizers on various properties of PVC, and concludes that DBS and DHS show promising potential as green plasticizers for PVC.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Agronomy
Jiali Fan, Yuyao Li, Bing Wang, Fengwei Gu, Feng Wu, Hongguang Yang, Zhaoyang Yu, Zhichao Hu
Summary: This study determined the Poisson's ratio and Young's modulus of potato main stems at different heights and proposed a new method to determine them. The study provides important data for the construction of models and simulation in potato harvesting, and introduces new ideas for measuring Poisson's ratio and Young's modulus of non-regular cylindrical viscoelastic materials.
Article
Chemistry, Physical
Yanchun Yin, Guangyan Liu, Tongbin Zhao, Qinwei Ma, Lu Wang, Yubao Zhang
Summary: The heterogeneity of micro parameters in rocks has a significant impact on their macro mechanical behavior. However, the current testing and inversion methods are not suitable for measuring micro parameters in rocks. This study proposes a parameter field inversion method based on the digital image correlation method and finite element method to measure the distribution of micro Young's modulus and micro Poisson's ratio in rocks. The accuracy of the inversion method is verified through numerical simulation and laboratory tests. The DF-PF inversion method provides a new effective way to test the Young's modulus field and Poisson's ratio field of rocks under complex stress states.
Article
Chemistry, Multidisciplinary
Wei Wang, Jianjie Wang, Hong Hai, Weikai Xu, Xiaoming Yu
Summary: This paper proposes an elliptical anti-tetrachiral honeycombs structure (E-antitet) with in-plane negative Poisson's ratio (NPR) and orthogonal anisotropy. The in-plane Poisson's ratio and Young's modulus are analyzed and verified through theoretical derivations, finite element method (FEM) numerical simulations, and experimental validation. The influences of different parameters on the in-plane Poisson's ratio and Young's modulus of E-antitet are also analyzed. The results show that the proposed E-antitet outperforms the anti-tetrachiral honeycombs structure (antitet) in achieving a smaller Poisson's ratio and larger Young's modulus, and it provides a more flexible means of regulation.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Lumin Shen, Xinxin Wang, Zhendong Li, Kai Wei, Zhonggang Wang
Summary: This paper proposes a new auxetic lattice structure based on self-similar configurations, and a theoretical model is developed to predict its elastic mechanical properties. The results show that the axial internal force affects the auxetic effect of the structure in the three principal directions.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Textiles
Mehrdad Arianpour, Majid Safar Johari, Hadi Dabiryan
Summary: This study investigates the impact of structural parameters on the Poisson's Ratio of tubular braids and finds that factors such as braid angle, floating length of yarns, yarn count, and structural layers affect the magnitude of the Poisson's Ratio. Triaxial braids exhibit lower initial Poisson's Ratio compared to biaxial braids.
JOURNAL OF THE TEXTILE INSTITUTE
(2022)
Article
Geochemistry & Geophysics
Pengwei Wang, Zhongbao Liu, Xiao Chen, Dongjun Feng, Ruyue Wang, Zeyang Peng
Summary: The study investigates the impact of coexisting clay mineral and organic matter on pore growth in the Da'anzhai Shale reservoir, revealing that the pore system is dominated by clay-mineral-hosted pores, with organic pores influenced by pyrobitumen filling. The pore system in the shale reservoir is controlled by the coexistence of clay mineral and pyrobitumen, affecting pore size, shape, and volume.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2021)
Article
Geochemistry & Geophysics
Fuqiang Lai, Yuejiao Liu, Xiaopan Kou, Zhaohui Huang, Zhen Chen, Yuanqi Liu, Guoqiang Jiang, Yongqian Zang, Min Wang, Ruyue Wang, Martina Zucchi
Summary: In this study, the pore characteristics of tight sandstone reservoirs were determined using NMR and high-pressure mercury injection experiments. A method for fluid identification was developed and showed better performance in identifying high-resistivity water layers compared to conventional methods.
Article
Geochemistry & Geophysics
Shuang Wang, Zhonghu Wu, Jun Chen, Hao Liu, Ruyue Wang, Jingshou Liu
Summary: This study analyzed the mineralogical composition of shale cores from a well in northern Guizhou and investigated the impact of mineral components on the permeability impairment rate and stress sensitivity coefficient of shale reservoirs. The results showed that clay mineral content and effective stress were negatively correlated with permeability and porosity, while detrital mineral content was positively correlated. Quartz content and modulus of elasticity were negatively correlated with permeability impairment rate and stress sensitivity factor, while clay mineral content was positively correlated. Shale with higher brittle mineral content was more likely to undergo brittle damage and exhibited lower stress sensitivity factor.
Article
Energy & Fuels
Gang Zhao, Wenlong Ding, Jing Tian, Jingshou Liu, Yang Gu, Siyu Shi, Ruyue Wang, Ning Sun
Summary: The study investigated the correlations between elemental, mineral contents, and mechanical parameters of shale in the Lower Cambrian Niutitang Formation in the Fenggang block of northeastern Guizhou. It was found that within certain ranges of silicon content, there were significant positive/negative correlations between static Young's modulus, shear modulus, bulk modulus, and brittleness index with silicon content, clay, and quartz, feldspar, and mica contents. There is uncertainty in determining rock mechanical parameters within certain elemental content ranges, indicating the need for more mathematical models and factors to adequately characterize those parameters.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Gang Zhao, Zhijun Jin, Wenlong Ding, Guangxiang Liu, Jinbiao Yun, Ruyue Wang, Guanping Wang
Summary: The study on fractures in the Wufeng-Longmaxi Formation in Hunan Province reveals that these fractures can be divided into different types based on their combination characteristics and roughness. The fractures mainly occurred in the late Yanshanian-Himalayan period and experienced repeated processes of splitting, healing, and re-splitting. The gas migration and enrichment in these fractures play a key role in the distribution and preservation of shale gas.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Fuqiang Lai, Xiaoxue Xia, Changjiang Wang, Ruyue Wang, Lulu Zhong, Zhaohui Huang, Haitao Wang, Zhangxiong Zhu
Summary: This study analyzed the pore types and structures of shale gas reservoirs in the Zhaotong national shale gas demonstration area in the southern margin of the Sichuan Basin through various experimental methods. Organic matter pores and clay mineral interlamellar pores were found to be the main pore types in marine shale gas reservoirs in the study area. Furthermore, the total organic carbon content was positively correlated with the complexity and heterogeneity of reservoir pores.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2022)
Article
Geochemistry & Geophysics
Wenchao Fang, Xuejie Qin, Chuanxi Liu, Ruyue Wang, Jun Pu, Hanqiao Jiang, Weiling He
Summary: Understanding the relationship between petroleum recovery and characteristics of hydraulic fracture network is crucial for the economic development of tight reservoirs. This study investigates the effect of fracture density and fracture connectivity on reservoir behavior and well production using a new discrete fracture simulator. The simulations reveal that increasing fracture density or fracture connectivity significantly improves well production, with fracture connectivity playing a more important role. In tight reservoirs with abundant natural fractures, placing horizontal wells parallel to the direction of natural fractures is determined to be the optimal strategy.
Article
Geosciences, Multidisciplinary
Weiling He, Ruyue Wang, Qiqi Lyu, Jun Liu, You Wu
Summary: The fine-grained sedimentary rock reservoirs in the Late Triassic Yanchang Formation in the Ordos Basin in central China have great potential for tight oil production. Through comprehensive analysis of various characteristics and experiments, it was found that the reservoir experienced processes such as compaction, cementation, and dissolution. The burial history analysis revealed three phases of oil charging in the reservoir. The role of organic acid and the protective effect of chlorite membrane inhibited the densification process of the reservoir.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Xinghua Wang, Ruyue Wang, Rongtao Guo, Arash Dahi Taleghani, Shuaitao Su, Wenlong Ding, Yue Gong, Fuqiang Lai, Zhonghu Wu, Yushan Su, Zhe Cao
Summary: The marine shale of southern China is characterized by a complex fracture system, which greatly adds to the difficulties in shale gas exploration and development. This study examines the developmental characteristics of fractures in the Cen'gong block and finds that fracture abundance is closely related to buried depth and regional faults in the study area.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Xuehui Zhou, Ruyue Wang, Zhili Du, Jing Wu, Zhonghu Wu, Wenlong Ding, Ang Li, Zikang Xiao, Zixian Cui, Xinghua Wang
Summary: Based on the observations and testing data, this paper discusses the characteristics and controlling factors of fractures and their control on shale gas accumulation in the Lower Cambrian Niutitang Formation black shale reservoir of Well YX1 in the northern Guizhou Province. The results show that various types of fractures are present in the Niutitang Formation, and their formation is mainly controlled by major faults. Compared to other shale gas reservoirs, the Well YX1 reservoir has both geological sweet spots and engineering sweet spots, but deformation and faulting have caused the loss of shale gas and damage to the overpressure environment.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Zhonghu Wu, Shuang Wang, Jun Chen, Huailei Song, Wentao Wang, Ruyue Wang, Hao Liu
Summary: This study investigates the impact of quartz content on fracture expansion in shale reservoirs. Numerical simulations and physical tests were used to analyze shale models with different quartz contents. The results show that a quartz content of 50% to 65% leads to higher compressive strength and fracture proportion. Fractures occur within the shale matrix or at the junctions of the shale matrix and quartz grains. The fractal dimension is higher for a quartz content of 50% to 65%.
Article
Geochemistry & Geophysics
Ran Tan, Ruyue Wang, Yahao Huang, Rui Yang, Hongbo Li, Kuan Lu
Summary: This study investigates the effect of different fractures on shale gas construction or destruction by analyzing fracture cements in the Silurian-Ordovician shale formations in the southern Sichuan Basin. The geochemical investigations reveal the diagenetic mineral sequences, paleo-pressure recovery, and diagenetic fluid environments. It is found that bedding slippage fractures enhance shale gas enrichment, while high-angle shear fractures disrupt the shale sealing. The study also examines the trapping conditions and periods of gas accumulation through the analysis of CH4-bearing fluid inclusions. Results show that pore fluid pressure and pressure coefficient in the shale reservoirs have significantly reduced due to tectonic activities and strata uplift-erosion.
Article
Geochemistry & Geophysics
Xuan Wang, Ruyue Wang, Jianping Bai, Na Zhang, Haoting Xing, Michael Kamoto, Weiling He
Summary: This study characterizes the sedimentary fabric and formation environment of dendrolites in the Cambrian Zhangxia Formation in Zibo, Shandong Province, and analyzes its genetic mechanism. It has great significance for studying microbial carbonate in geological history and its implications for oil exploration.
Article
Geochemistry & Geophysics
Yuejiao Liu, Fuqiang Lai, Ruyue Wang, Zhonghu Wu, Xiaoshu Zhang, Hao Xu, Jiao Li
Summary: This paper discusses the brittleness characteristics and controlling factors of continental shale in the Da'anzhai Member of the Ziliujing Formation in the northeast Sichuan Basin. Carbonate minerals play a significant role in controlling the brittleness of continental shale, and the presence of shell limestone interlayers and laminates greatly improves the reservoir's brittleness.
Article
Geochemistry & Geophysics
Yuejiao Liu, Haitao Wang, Fuqiang Lai, Ruyue Wang, Haijie Zhang, Xiaoshu Zhang, Fahui Ou
Summary: A 3D digital core model was constructed to simulate the influences of gas saturation, mineral composition, stratification, and fractures on Poisson's ratio in a shale gas reservoir. The results showed that stratification dip angle and fracture dip angle had the greatest impact on Poisson's ratio, reaching its minimum value when the angles were close to 45 degrees. Poisson's ratio was most sensitive to the content of calcite and least influenced by gas saturation. The average error between the measured and simulated Poisson's ratio was 4.920%.