Article
Energy & Fuels
Yifeng Shen, Youhong Sun, Guobiao Zhang, Yun Qi, Hengfeng Shan, Bing Li
Summary: Hydraulic fracturing is a promising technique for improving gas productivity and energy efficiency in low-permeability hydrate reservoirs. However, the impact of fracturing fluids on hydrate reservoirs has not been well studied. This research simulated the invasion of fracturing fluid into hydrate reservoirs and found that it can cause phase transitions and affect fracturing. The results provide important guidance for the application of hydraulic fracturing in field tests of hydrate reservoirs.
Article
Energy & Fuels
Xiaolong Ma, Dandan Jiang, Youhong Sun, Shengli Li
Summary: This study experimentally investigated the hydraulic fracturing behavior of clayey silt NGH reservoir and found the importance of even ice distribution on fracture propagation, as well as the influence of injection rate on complex fracture formation.
Article
Engineering, Multidisciplinary
Shaowen Mao, Kan Wu, George Moridis
Summary: This paper develops an integrated hydraulic fracturing simulator by coupling a planar three-dimensional fracture propagation model with an efficient Eulerian-Lagrangian proppant transport model. The simulator can efficiently deal with multi-modal particle simulations and improve the prediction of effective/propped fracture geometries. The simulation results can better the fracturing designs.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Fang Shi, Daobing Wang, Xiaogang Chen
Summary: The study investigates the behavior and propagation mechanisms of hydraulic fractures in fracture-cavity reservoirs, finding that factors such as lateral stress coefficient, confining stress, in-situ stress difference, fluid viscosity, and fluid pumping rate all play a role in shaping the fracture path. Frictional natural fractures connected to cavities significantly alter stress distribution, causing hydraulic fractures to deviate from their original direction. Natural cavities between adjacent fracturing stages have a significant impact on stress distribution, leading to irregular fracture propagation paths.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Energy & Fuels
Caiyuan Xiao, Guiju Zhang, Yudong Yu
Summary: This study numerically analyzes hydraulic fracturing processes in a multi-layered fractured reservoir, finding that fluid leakage rate increases with depth, linear equations can be derived for each layer, and the maximum opening pressure for fracturing increases with depth.
Article
Energy & Fuels
Jing Tang, Bingjie Liu, Guodong Zhang
Summary: The presence of embedded gravel induces heterogeneity in stress and strength in glutenite reservoirs, affecting the initiation and propagation of hydraulic fractures. Using a coupled seepage-DEM approach, this study investigates the mechanisms of fracture initiation and propagation, determines the terminal fracture morphologies, and studies the effects of stress differences, permeability, and gravel strength. The results show that the initiation and propagation of hydraulic fractures are significantly influenced by embedded gravel. The stress and strength heterogeneity near the wellbore increase the complexity of the fracture network, and interactions between propagating fractures and encountering gravel are observed.
Article
Mechanics
Hongwei Shi, Haifeng Zhao, Jiawei Zhou, Yanjiang Yu
Summary: Hydraulic fracturing is a potential method for developing natural gas hydrate reservoirs, as it improves permeability and maintains formation stability. Experimental results show that the effects of hydrate size and approaching angle on hydraulic fracturing are different, and design should be tailored to specific conditions.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Energy & Fuels
Meng Cai, Wei Wang, Xianjun Wang, Liang Zhao, Hongtao Zhang
Summary: This study investigates the behavior of hydraulic fracture propagation in the tight oil reservoirs of Fuyang and Gaotaizi in the Daqing Oilfield. The research shows that stress differences and rock mechanical parameters play key roles in controlling fracture penetration. Additionally, flow rate and viscosity of the fracturing fluid have significant impacts on fracture progression.
Article
Mechanics
Heqian Zhao, Kan Wu, Zhongwei Huang, Zhengming Xu, Huaizhong Shi, Haizhu Wang
Summary: CO2 fracturing shows better effectiveness and efficiency in naturally fractured reservoirs, generating relatively longer but narrower fractures, activating more natural fractures, and creating a larger stimulated reservoir volume.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Heqian Zhao, Kan Wu, Zhongwei Huang, Zhengming Xu, Huaizhong Shi, Haizhu Wang
Summary: Hydraulic fracturing has become a crucial technology for unconventional oil and gas development. CO2 fracturing shows advantages in shale gas exploitation due to its ability to activate more natural fractures in reservoirs. The study establishes a CO2 fracturing model in naturally fractured reservoirs and demonstrates its effectiveness in creating longer, narrower fractures and connecting more natural fractures to stimulate a larger reservoir volume. Additionally, natural fracture spacing and length significantly impact the distribution and connectivity of natural fractures in CO2 fracturing.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Xiaolong Ma, Dandan Jiang, Xiaoyu Fang, Xiaochu Wang
Summary: This study established a three-dimensional hydraulic fracturing model to analyze the influence of fracturing fluid injection rate and fracture spacing on the formation and distribution of fractures in clayey silt natural gas hydrate reservoirs. The results showed that the injection rate and fracture spacing play a significant role in the formation and propagation of fractures.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Energy & Fuels
Zhongzheng Tian, Zhuang Xiong, Yuhua Wei, Shou Ma, Xiaodong Hu
Summary: Coalbed methane, an unconventional oil and gas resource, is a key focus of exploration worldwide, and hydraulic fracturing is crucial for its efficient stimulation. However, due to the heterogeneity and natural fractures in deep coal seam reservoirs, accurately capturing the complex fracture propagation path is challenging. This study proposes a hydraulic fracture propagation simulation method using ABAQUS Software and a fluid-solid coupled finite element model with a cohesive zone model. The model's accuracy is verified using Blanton's experiment criterion and is used to simulate the impact of various factors on the hydraulic fracture propagation behavior. The study aims to enhance understanding of the mechanism of hydraulic fracture propagation in deep coal seams and provide guidance for fracturing design.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Mechanics
Julio Rueda, Cristian Mejia, Deane Roehl
Summary: This paper presents a new 3D mesh fragmentation technique to simulate non-planar hydraulic fracture propagation, considering its interaction with natural fractures. The approach is successfully validated against experimental fracturing tests and analytical models, providing insight into the complex hydraulic fracturing process in naturally fractured formations. This method is an attractive alternative to simulate multi-staged fracturing into 3D multilayered fractured rock formations.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Chemical
Yue Zhu, Yusen Deng, Jianhua Qin, Jing Zhang, Yushi Zou, Shicheng Zhang, Shikang Liu
Summary: Conglomerate reservoirs in sag slope belts have unique characteristics that make stimulation treatments difficult due to insufficient understanding of the propagation mechanism of fracture morphologies. Experimental research on conglomerate outcrops and laboratory tests were conducted to study the hydraulic fracture propagation in these reservoirs. The results showed that gravel size, fracturing fluid viscosity, and pumping rate have significant effects on fracture propagation morphology and network formation.
Article
Geosciences, Multidisciplinary
Yixin Lu, Zhaoping Meng, Xuefeng Su, Yina Yu
Summary: This study reveals the evolution of coal sample permeability during fracturing and establishes the relationship between coal sample fracture morphology and permeability. The results provide data support for the reformation of hydraulic fracturing in coalbed methane wells.
NATURAL RESOURCES RESEARCH
(2022)
Article
Engineering, Geological
Ming Chen, Tiankui Guo, Yushi Zou, Shicheng Zhang, Zhanqing Qu
Summary: A proppant transport simulator coupled with multi-planar 3D fracture propagation has been developed to examine the proppant distribution among multiple hydraulic fractures during multi-cluster fracturing in a horizontal well. The model considers factors such as multi-fracture stress interaction, fluid leak-off, and proppant settling, and results show that injection schedules, proppant sizes, density, and fluid viscosity all impact proppant distribution.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Ming Chen, Tiankui Guo, Zhanqing Qu, Mao Sheng, Lijun Mu
Summary: A fully coupled fracture model is proposed to interpret the mechanism of fracture initiation and breakdown pressures. Sensitivity analysis demonstrates the dependence of initiation pressure and peak pressure on rock properties and injection conditions. A method to determine fracture initiation pressure is presented.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Xian Shi, Weiqiang Song, Hongxing Xu, Tiankui Guo, Qihong Feng, Sen Wang, Shu Jiang
Summary: Variable density in-plane perforations in a horizontal well can create transverse fractures and prevent fracture propagation, with the in situ stress and treatment parameters significantly influencing fracture morphology and breakdown pressure.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Ming Chen, Tiankui Guo, Shicheng Zhang, Zhanqing Qu, Yushi Zou
Summary: Understanding the interaction between hydraulic fractures (HFs) and frictional discontinuities (FDs) is crucial for interpreting microseismic events and fracture propagation. This study presents a new numerical model using a complementarity algorithm to accurately describe and determine the contact modes of FDs in HF-FD interaction. Parametric studies show that increasing the friction coefficient and strength can reduce FD slippage and increase FD opening, while increasing fluid pressure facilitates HF crossing FDs.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Energy & Fuels
Yunkai Ji, Timothy J. Kneafsey, Jian Hou, Jianlin Zhao, Changling Liu, Tiankui Guo, Bei Wei, Ermeng Zhao, Yajie Bai
Summary: The water-gas relative permeability in hydrate-bearing porous media is crucial for understanding multiphase flow characteristics. Experimental results reveal that increasing hydrate saturation reduces the effective permeability of water and gas. However, the effect of hydrate saturation on the water-gas relative permeability differs from its effect on the effective permeability.
Article
Energy & Fuels
Xian Shi, Haoyong Huang, Bo Zeng, Tiankui Guo, Shu Jiang
Summary: Understanding the behavior of hydraulic fracture propagation and its impact on gas production is crucial for the successful development of shale gas reservoirs. This study combines hydraulic fracturing with reservoir modeling to gain insight into the complex fracture paths and consider factors such as the Langmuir isotherm effect and non-Darcy flow. It is found that the actual hydraulic fracture path has a significant impact on shale gas output, and simultaneous fracturing design schemes result in more complex fracture propagation compared to sequential hydraulic fracturing design schemes. Coupling curved hydraulic fracture stimulation with shale gas reservoir production modeling is recommended for simultaneous fracturing design schemes.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Thermodynamics
Wei Zhang, Zenglin Wang, Tiankui Guo, Chunguang Wang, Fengming Li, Zhanqing Qu
Summary: This study conducted integrated research on heat mining and EGS fracturing to accurately predict EGS productivity in the HDR fracturing stage and the EGS heat mining stage. The results showed that SCO2 fracturing can reduce fracture connection time, increase damage area, and synchronous fracturing can save fracturing time and increase fracture surface area. Moreover, increasing the horizontal stress difference enhances the heat mining rate.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Zhanqing Qu, Jiacheng Fan, Tiankui Guo, Xiaoqiang Liu, Jian Hou, Meijia Wang
Summary: A large-size phase change proppant was developed for hydraulic fracturing in marine NGH reservoirs. The emulsification process was optimized to control the particle size and prevent cementation, resulting in cured proppants with regular structure and good compressive strength, and emulsion proppants with good transport capacity.
Article
Energy & Fuels
Mingkun Lv, Zhanqing Qu, Tiankui Guo, Ming Chen, Yuanhang Zhang, Xuliang Jia, Xiaoqiang Liu, Yiwen Liu
Summary: Hydraulic fracturing is crucial for tapping into unconventional oil and gas resources. Understanding the transport characteristics of granular materials such as temporary plugging agents (TPA) and proppants within fractures is essential for optimizing the fracturing process and achieving better results. The study found that using different fracturing fluids and concentrations of floating agents can improve the filling of fractures when injecting different sizes of TPA. Additionally, the use of coated quartz sand enhances its transport capacity and reduces the amount of sand needed. This research has important implications for the effectiveness of hydraulic fracturing operations.
Editorial Material
Engineering, Chemical
Tiankui Guo, Ming Chen
Article
Engineering, Petroleum
Mingkun Lv, Tiankui Guo, Zhanqing Qu, Ming Chen, Caili Dai, Xiaoqiang Liu
Summary: The filling of proppants within complex fractures is crucial for the effectiveness of volumetric fracturing in shale. This study used a visual simulation equipment to analyze the transport of proppants within complex fractures. The experiments showed that factors such as perforation, fluid flow velocity, proppant concentration and size, and injection techniques all affect proppant transport. Additionally, the shape, flow rate, and inclination of the fractures also play a role in proppant transport.
Article
Energy & Fuels
Jia-Cheng Fan, Zhan-Qing Qu, Tian-Kui Guo, Ning Qi, Ming Chen, Jian Hou, Ji-Jiang Ge, Xiao-Qiang Liu, Ji-Wei Wang
Summary: Hydraulic fracturing is critical for the economic development of unconventional oil and gas reservoirs. The performance of proppants plays a key role in fracture propping and reservoir stimulation. Traditional proppants face limitations in migration within deeper reservoirs, highlighting the need for proppants with good transportation capacity and fracture propping effects. A novel self-generated proppant based on toughened low-viscosity and low-density epoxy resin was developed, demonstrating good migration capacity due to the low resin density.
Article
Energy & Fuels
Tian-Kui Guo, Zhi-Lin Luo, Jin Zhou, Yuan-Zhi Gong, Cai-Li Dai, Jin Tang, Yang Yu, Bing Xiao, Bao-Lun Niu, Ji-Jiang Ge
Summary: This study investigates the migration and placement of proppants within complex fractures by considering fracture wall roughness using computational fluid mechanics-discrete element method (CFD-DEM). The results show that proppant placement non-uniformity and migration capacity are enhanced in rough fractures compared to smooth fractures. The injection rate and fracturing fluid viscosity have a significant impact on proppant migration and placement.
Article
Materials Science, Multidisciplinary
Tiankui Guo, Zhilin Luo, Shanbo Mou, Ming Chen, Yuanzhi Gong, Jianhua Qin
Summary: This study investigates the problem of large-scale inclined fractures in unconventional reservoirs using numerical methods, considering the influence of factors such as fracture roughness, inclination, proppant particle size, injection rate, and fluid viscosity. The results show that a rough wall allows the proppant to travel farther and cover larger areas, while the inclination angle has little effect on dunes but significant influence on the suspension zone. In addition, small particle size, high injection rate, and high fluid viscosity are beneficial for proppant transport.
FDMP-FLUID DYNAMICS & MATERIALS PROCESSING
(2022)
Article
Energy & Fuels
Chen Ming, Guo Tiankui, Xu Yun, Qu Zhanqing, Zhang Shicheng, Zhou Tong, Wang Yunpeng
Summary: A forward model for optical fiber strain based on a planar 3D multi-fracture model was established, and a forward method to calculate distributed fiber strain induced by multi-fracture growth was proposed. Numerical simulations were conducted to study the fiber strain evolution during fracturing of a horizontal well. The results showed that fiber strain evolution can be divided into three stages, while fiber strain rate evolution has four stages. The straight-line convergence band of distributed fiber strain or strain rate can identify the time when the fracture extends to the fiber and inter-well pressure channeling. Moreover, the instants of fractures reaching the fiber monitoring well can be used to evaluate the non-uniform growth of multiple fractures.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2022)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.