A Coupled Gas Flow-Mechanical Damage Model and Its Numerical Simulations on High Energy Gas Fracturing

Bai, Yu; Sun, Li; Wei, Chenhui

doi:10.1155/2020/3070371

Cited by 19 publications

(8 citation statements)

References 39 publications

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“…The GNSS-R altimeter opens up a new method of the sea surface altimeter. Since monitoring the changes of the sea level is very important to human society, especially the residents living in coastal areas and islands, the development of GNSS-R altimeter technology has a very significant importance and practical value for production and life (Bai et al 2020).…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Sea level height based on big data of Internet of Things and aerobics teaching in coastal areas

Shao

Xiao-po

2021

Arab J Geosci

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Direct signals from the global navigation satellite system have reflection and scattering effects after passing through the sea level. When the reflected signal and the scattered signal enter the receiver, multipath effects will occur, which will affect the measurement results. Therefore, in navigation and positioning measurement, such signals must be suppressed. With the steady progress of global navigation satellite systems (GNSS) systems, reflected or scattered signals can be used to remotely sense the height of the sea. This altimeter technology is called global navigation satellite system reflectometry (GNSS-R). As a new sea altimeter technology, it can make up for the shortcomings of the high-cost satellite altimeter technology and the narrow range of tides in the previous sea altimeter technology, providing long-term stability and high spatial and temporal resolution signals. As a station altimeter, it is expected to solve the problem of medium-scale sea level altimeters. GNSS-R altimeter technology is one of the research fields that attract the attention of domestic and foreign experts and scholars. As an important part of college physical education curriculum, aerobics plays an important role in guiding students' physical and mental development and improving students' esthetic ability. While comprehensively popularizing high-quality education, the goal of comprehensive training of students has also been achieved. Different from the previous sports aerobics courses, if you want the continuous and diverse development of aerobics, you must continue to promote the reform and optimization of gymnastics guidance, the update of course content, and the guidance methods. In the development of aerobics research and practice, new experiences and social needs will be transformed into education and the quality of education will be improved. This article analyzes the factors that affect the quality of aerobics education in coastal areas and puts forward corresponding countermeasures and suggestions to improve the quality of aerobics education.Keywords Internet of Things . Sea level . Aerobics . Teaching quality This article is part of the Topical Collection on Smart agriculture and geo-informatics

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Sea level height based on big data of Internet of Things and aerobics teaching in coastal areas

Shao

Xiao-po

2021

Arab J Geosci

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“…Through optimization of the design of the charge structure, the pressure rise time, pressure peak, and pressure action process can be accurately controlled. A multistage gas stratum can be fractured at the same time to produce multiple fractures and to communicate with the natural fractures in the coal seam to increase production …”

Section: Engineering Experiments and Methodsmentioning

confidence: 99%

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

Tian

Cao

et al. 2023

ACS Omega

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The geological conditions of coal reservoirs in China are complex, and the reservoir permeability is generally lower. Multifracturing is an effective method of improving reservoir permeability and coalbed methane (CBM) production. In this study, two types of dynamic loads, CO 2 blasting and a pulse fracturing gun (PF-GUN), were used to conduct multifracturing engineering tests in nine surface CBM wells in the Lu'an mining area in the central and eastern parts of the Qinshui Basin. The curves of pressure versus time of the two dynamic loads were obtained in the laboratory. The prepeak pressurization time of the PF-GUN was 200 ms, and that of the CO 2 blasting was 2.05 ms, which just falls in the optimum pressurization time of multifracturing. The microseismic monitoring results revealed that, in terms of the fracture morphology, both the CO 2 blasting and PF-GUN loads produced multiple sets of fractures in the near-well zone. In the six wells used for the CO 2 blasting tests, an average of three branch fractures were produced outside of the main fracture, and the average angle between the main fracture and the branch fractures exceeded 60°. In the three wells stimulated by PF-GUN, an average of two branch fractures were produced outside of the main fracture, and the average angle between the main fracture and the branch fractures was 25−35°. The multifracture characteristics of the fractures formed via CO 2 blasting were more obvious. However, a coal seam is a multifracture reservoir with a large filtration coefficient; the fracture will not extend after reaching the maximum scale under a certain gas displacement condition. Compared with the traditional hydraulic fracturing technique, the nine wells used in the multifracturing tests exhibited an obvious stimulation effect with an average increase of 51.4% in daily production. The results of this study provide an important technical reference for the efficient development of CBM in low-and ultralowpermeability reservoirs.

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“…The numerical model of the physically similar simulated mine was established using FLAC3D, which is software for threedimensional (3D) explicit finite difference simulations. The model was defined to satisfy the Mohr-Coulomb damage criterion (Wu et al, 2018;Yu and Duan, 2021;Bai et al, 2020). In Table 1, the parameters and boundary conditions of the physical and mechanical properties of each rock stratum are presented, which were used in similar simulation experiments.…”

Section: Numerical Simulationmentioning

confidence: 99%

Multi-sensor optimal deployment based efficient and synchronous data acquisition in large three-dimensional physical similarity simulation

Hao

Zhang

2022

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Purpose This paper aims to propose a deployment optimization and efficient synchronous acquisition method for compressive stress sensors used by stress distribution law research based on the genetic algorithm and numerical simulations. The authors established a new method of collecting the mining compressive stress-strain distribution data to address the problem of the number of sensors and to optimize the sensor locations in physical similarity simulations to improve the efficiency and accuracy of data collection. Design/methodology/approach First, numerical simulations were used to obtain the compressive stress distribution curve under specific mining conditions. Second, by comparing the mean square error between a fitted curve and simulation data for different numbers of sensors, a genetic algorithm was used to optimize the three-dimensional (3D) spatial deployment of sensors. Third, the authors designed an efficient synchronous acquisition module to allow distributed sensors to achieve synchronous and efficient acquisition of hundreds of data points through a built-in on-board database and a synchronous sampling communication structure. Findings The sensor deployment scheme was established through the genetic algorithm, A synchronous and selective data acquisition method was established for reduced the amount of sensor data required under synchronous acquisition and improved the system acquisition efficiency. The authors obtained a 3D compressive stress distribution when the advancement was 200 m on a large-scale 3D physical similarity simulation platform. Originality/value The proposed method provides a new optimization method for sensor deployment in physical similarity simulations, which improves the efficiency and accuracy of system data acquisition, providing accurate acquisition data for experimental data analysis.

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A Coupled Gas Flow-Mechanical Damage Model and Its Numerical Simulations on High Energy Gas Fracturing

Cited by 19 publications

References 39 publications

RETRACTED ARTICLE: Sea level height based on big data of Internet of Things and aerobics teaching in coastal areas

RETRACTED ARTICLE: Sea level height based on big data of Internet of Things and aerobics teaching in coastal areas

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

Multi-sensor optimal deployment based efficient and synchronous data acquisition in large three-dimensional physical similarity simulation

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