Article
Geochemistry & Geophysics
Taeyeob Lee, Daein Jeong, Youngseok So, Daejin Park, Munseok Baek, Jonggeun Choe
Summary: An integrated workflow from geomechanics to reservoir simulation is proposed to accurately estimate performances of a shale gas reservoir by updating model parameters. Sensitivity analysis on parameters such as leakoff coefficient and horizontal stress anisotropy influences the propagation of fractures and gas productions. Calibration of the mechanical earth model (MEM) with microseismic measurements helps reduce uncertainties in production estimations.
Article
Computer Science, Interdisciplinary Applications
Yun Zhou, Diansen Yang
Summary: In this paper, a fast simulation method based on fully coupled XFEM is proposed to address the low efficiency and poor convergence in simulating the generation of complex fracture networks. The superiority of the proposed model in computational efficiency is demonstrated through numerical validation and analysis of several cases. The influence of key factors on the propagation of hydraulic fracture is investigated.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Mechanics
M. Krzaczek, J. Tejchman
Summary: In this paper, a 2D numerical simulation of hydraulic fracturing process in rock specimens with a single injection slot was conducted using a unique DEM/CFD-based pore-scale THM model. The impacts of dynamic viscosity, gas phase content, and temperature difference on the initiation and propagation of hydraulic fracture were examined in-depth.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Hui Li, Hongwu Lei, Zhenjun Yang, Jianying Wu, Xiaoxian Zhang, Shouding Li
Summary: A hydro-mechanical-damage fully coupled numerical method is developed for simulations of complicated quasi-brittle fracking in poroelastic media. The method combines fluid flow modeling in fractures and porous media using a unified fluid continuity equation with crack-width dependent permeability. The method is validated using analytical and experimental results, and is further applied to simulate horizontal wellbore fracking problems.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Energy & Fuels
Saad Alafnan
Summary: This study investigates the impact of supercritical carbon dioxide injection on the geomechanics of kerogen in shale formations. It reveals that the injection of supercritical carbon dioxide alters the mechanical behavior of kerogen, leading to a decrease in ductility under applied stress. This research provides nano-scale insights into the advantages of using supercritical carbon dioxide to degrade the mechanical integrity of organic matters contained in shales, supporting the value of carbon dioxide sequestration in shale formations.
Article
Computer Science, Interdisciplinary Applications
Mingyao Li, Dong Zhou, Yewang Su
Summary: In this paper, a simple numerical tool is developed to simulate the coupled hydro-mechanical behavior of hydraulic fracturing. By using an analogy between hydraulic fracturing and heat conduction, the numerical implementation is simplified and can be directly realized in the framework of the commercial finite element package ABAQUS. The proposed tool is versatile and can be applied to study various coupled problems.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Julio Rueda, Cristian Mejia, Deane Roehl
Summary: This study proposes numerical models for simulating fracture propagation and fluid migration in fractured media. A new model is also developed to more realistically represent the hydromechanical behavior of fractured porous formations. The study investigates the impacts of natural fractures on reservoir hydromechanical behavior.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Ge Zhu, Shimin Dong
Summary: Research on hydraulic fracturing under unstable injection conditions focuses on lab experiments and field tests, with a lack of coupling analysis between transient flow in tubing and reservoir seepage. Results show that simulation models can accurately predict fluid pressure variations during fracturing, with the scale of the system significantly impacting these variations. The study can guide parameter design for field applications and highlight the differences between lab experiments and field conditions.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
A. Jafari, M. Vahab, N. Khalili
Summary: A novel fully coupled hydro-mechanical model is used to assess the effect of fluid loss on the efficiency of fracturing treatment within saturated porous media. The model incorporates the formation of a cake layer, effects of filtrate, and independent pressure degrees of freedom. Numerical simulations demonstrate the framework's ability to model hydraulic fracturing in medium to low permeability formations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Geological
Haoyu Zhang, Junbin Chen, Ziyan Li, Heng Hu, Yu Mei
Summary: This study investigates the evolution of the fracture network in quasi-brittle shale reservoirs during multi-cluster fracturing. The research highlights the importance of considering the non-homogeneity and complexity of real rocks in hydraulic fracturing simulations. The findings show that increasing the number of clusters or reducing the perforation diameter can improve the stimulated reservoir volume (SRV).
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Haoyu Zhang, Junbin Chen, Diguang Gong, Huanmei Liu, Wen Ouyang
Summary: There are several problems in studying the evolution of fracture network during multicluster fracturing, such as assuming the reservoir is homogeneous and neglecting the heterogeneity of rock particles. The study developed a 2D numerical model using a coupled stress-seepage-damage field approach to simulate hydraulic fracture propagation. The model considered reservoir heterogeneity by assigning randomly distributed properties to cohesive elements. The results showed that fracture network complexity increases with reservoir heterogeneity and injection pressure. Low-viscosity fracturing fluid does not significantly impact fracture network complexity. Shortening pad fluid injection time increases fracture network complexity but also raises the extreme value of injection pressure.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Chemistry, Multidisciplinary
Nikita Dubinya, Irina Bayuk, Milana Bakhmach
Summary: This study focuses on the problem of estimating the brittleness of rock masses using geophysical data for the petroleum industry. Three main ways of estimating brittleness-mineral-based, log-based, and elastic-based brittleness indices-are discussed from the perspective of scaling factor. The study highlights the contradictions in brittleness indices calculated using different methods of introducing brittleness. These contradictions are explained by the scaling factor, as geophysical data used for brittleness estimation are typically obtained at different spatial and temporal scales. A model based on the effective medium theory is used to understand the relationships between the inner structure of inhomogeneous rocks and their brittleness indices estimated from laboratory tests on core samples and log data analysis.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Andreas Michael
Summary: A new hybrid data-driven/physics-based approach is proposed to model hydraulic fracture (HF) initiation and early-phase propagation from perforated horizontal wells. A treatment-optimization scheme via oriented perforating is presented, considering the orientation of the induced HF initiation and the resultant formation breakdown pressure. The effectiveness of oriented-perforating can be compromised by fracturing fluid leakages around the casing's circumference. The hybrid-modeling approach is also used to estimate fracture initiation pressure (FIP) values for the seven shale plays studied.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Aibaibu Abulimiti, Linsheng Wang, Chuanzhen Zang, Bo Chen, Xinsheng Xiang, Peijia Jiang, Jiaying Lin
Summary: This study uses a numerical model to investigate the dynamic and elastoplastic behaviors of rocks under impact loads, and quantifies the acceleration and wave propagation behaviors. The study finds that changing the loading rate, location, and introducing heterogeneity can significantly alter the mechanical response of the rocks. The results can provide insights into the near-well and instantaneous rock mechanical behaviors at the beginning of hydraulic fracturing.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Chemical
Bo Wang, Yan Fang, Lizhe Li, Zhe Liu
Summary: This paper proposes an integrated workflow to optimize multi-well multi-stage fracturing (MMF) treatments in unconventional reservoirs, with the net present value (NPV) of reserves as the objective function. Through optimizing the fracturing and reservoir models, a 20% higher NPV than the field reference case can be achieved. The optimized design has a larger drainage area, with maximum gas production rate increasing from 23.75 to 34.43 MMSCF/day and maximum oil production rate increasing from 497 to 692 STB/day.