Article
Energy & Fuels
Jingyu Shi, Baotang Shen
Summary: This study investigates the influence of temperature change on the orientation of fracture propagation in the hydraulic fracturing process. It was observed that cold fluid temperature can cause fractures to propagate in the opposite direction, reducing the curvature of the fractures.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Energy & Fuels
Mazda Irani, Farzad Bashtani, Apostolos Kantzas
Summary: A modified version of boundary-element-method (BEM) is implemented to capture deliverability in wellbore/reservoir interaction, incorporating the concept of global pressure and pressure shift at sand-face. This advancement may be helpful for analyzing new equilibrium in recompleted wells.
Article
Geography, Physical
Edyta Puniach, Wojciech Gruszczynski, Pawel Cwiakala, Wojciech Matwij
Summary: Underground mining operations can cause displacements that may threaten building structures. Monitoring these displacements using aerial photogrammetry and high-resolution orthomosaics can automate the determination process and improve accuracy through outlier removal techniques.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2021)
Article
Geosciences, Multidisciplinary
Yuandong Li, Bing Hao, Xiaojun Li, Liguo Jin, Qing Dong, Zhenghua Zhou
Summary: This paper introduces a method to determine overflow boundaries based on the maximum horizontal energy loss rate, which shows a higher accuracy compared to other calculation methods.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Marine
M. M. Han, C. M. Wang
Summary: A hybrid boundary element method was developed to solve the hydrodynamic response of a wide perforated breakwater with arbitrary hull geometry and multiple horizontal slits efficiently. The inclusion of analytical solutions in the numerical BEM is a novel aspect of this approach. Parametric studies showed that slits generally reduce diffracted and radiation potentials, especially when placed near the free surface.
Article
Geosciences, Multidisciplinary
Douzhong Zhang, Jiguang Tang, Kongquan Chen, Kaiming Wang, Peixian Zhang, Guisong He, Xiusong Tuo
Summary: This study analyzes the distribution law of the paleo-tectonic stress field in the Lintanchang area and predicts the fracture development areas under the superposition of two periods of tectonic stress using finite element numerical simulation technology. The results show that the distribution of tectonic fractures is affected by faults, folds, rock physical parameters, and tectonic stresses. The areas with the most developed structural fractures, as well as poor shale gas preservation conditions, are the anticline core and fault areas. On the other hand, the western flanks of the anticline and the eastern and western dipping ends have better shale gas preservation conditions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Chemical
Hai Lin, Yakai Tian, Zhenwei Sun, Fujian Zhou
Summary: This study used the finite element method to simulate multiple fractures fracturing simultaneously and explained the effect of stress around the horizontal wellbore on new fractures during the refracturing of old wells using a temporary plugging technique. The results showed that reperforating fracturing can assist in increasing the effective stimulated reservoir volume and achieving high and stable production.
Article
Energy & Fuels
Hongyang Chu, Zhiming Chen, Xinwei Liao, W. John Lee
Summary: The probability of well interference in reservoirs has increased due to the introduction of offsetting wells. A new transient model based on the boundary element method (BEM) is used to evaluate the targeted well's behaviors with the offsetting well production interference. The findings provide insights into the flow regions and factors that substantially influence the transient behaviors.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Yudong Zhong, Guizhong Xie, Liangwen Wang, Ke Li, Xinsheng Wang, Wenbin He, Shuguang Wang
Summary: This paper proposes new crack front elements with Williams' eigenexpansion properties for 3D crack problems. In this method, dual boundary integral equations are collocated on the uncracked boundary and one of the crack surfaces. The unknowns can be displacements, tractions, and crack open displacements on the crack faces. The crack front elements with Williams' eigenexpansion properties are developed based on the first order of the Williams' series eigenexpansion and the two-point formula.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Shaoyi Cheng, Ming Zhang, Zhaowei Chen, Bisheng Wu
Summary: Horizontal well and multi-stage hydraulic fracturing are commonly used for extracting unconventional oil/gas. This study develops a fully coupled hydraulic fracturing model that combines the dual boundary element method and the finite volume method. The results show that in-situ stress and injection parameters have significant influences on the growth behavior of multiple fractures.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Chemistry, Multidisciplinary
Simone Palladino, Luca Esposito, Paolo Ferla, Renato Zona, Vincenzo Minutolo
Summary: This paper describes the application of Field Boundary Element Method to fracture analysis of 2D rectangular plates made of Functionally Graded Material, aiming to calculate Mode I Stress Intensity Factor. The study shows the method's suitability for evaluating Stress Intensity Factor of Functionally Graded Materials plates, even in cases of more complex geometries.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
Han Hu, Yi Wu, Anas Batou, Huajiang Ouyang
Summary: In this paper, uncertainty propagation problems are tackled by modelling non-deterministic parameters as an interval field to capture spatial dependence. The interval field is constructed using a B-spline based interval field decomposition method, which is incorporated directly into the governing equation of the boundary value problems. The collocation method with B-spline basis expansion is utilized to approximate the solution to the governing equation, effectively accounting for crisp bounds of the output. Various numerical cases are provided to demonstrate the effectiveness of the proposed method, including the impact of influence radius, interval variable model, and multiple uncertain parameters. Furthermore, a Neumann expansion method is employed to determine the bounds of the output in discretized problems.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Physics, Particles & Fields
A. V. Ivanov, D. V. Vassilevich
Summary: This study investigates the eta-invariant of a Dirac operator with local boundary conditions using heat kernel methods. In even dimensions, it is related to the eta-invariant of a boundary Dirac operator, while in odd dimensions, it is expressed through the index of boundary operators. The strong ellipticity condition is found to be necessary for the applicability of these methods, and it is shown that the Witten-Yonekura boundary conditions are not strongly elliptic.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Engineering, Multidisciplinary
H. Zheng, J. Sladek, V. Sladek, S. K. Wang, P. H. Wen
Summary: This paper presents a novel hybrid Meshless Displacement Discontinuity Method for cracked Reissner's plate in Functionally Graded Materials. The governing equation is satisfied using meshless methods, and Stress Intensity Factors are evaluated analytically with Chebyshev polynomials. Accuracy is verified through comparison of numerical and analytical results.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Chemistry, Multidisciplinary
Yongjie Qi, Gang Wei, Feifan Feng, Jiaxuan Zhu
Summary: This paper investigates the corrective effect of sleeve valve pipe grouting on the displacement of subway tunnels, proposing a mechanical model and calculation formulas that align well with actual engineering data. It suggests that enlarging the grouting volume within a reasonable range can enhance the corrective effect, with the influence of grouting decreasing as the grouting distance increases. Additionally, setting the bottom of the grouting section at the same depth as the lower end of the tunnel maximizes the corrective effect.
APPLIED SCIENCES-BASEL
(2021)