A liquid‐solid model to optimize the application of friction reducers for hydraulic fracturing/cutting in the underground coal mine

Xiong, Wei; Shen, Kai; Ba, Quanbin; Liu, Yanbao; Houquan, Zhou

doi:10.1002/ese3.930

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…With the increase in coal mining intensity and the rapid growth of mining depth, the problems of gas outbursts are becoming more serious [1][2][3]. Terefore, the predraining boreholes are required to prevent gas outbursts [4][5][6]. Directional drilling technology (DDT) has the advantages of a controllable track, a long efective extraction distance, multiple branch holes, and a large concentrated extraction area, as well as the advantages of a lower drilling construction cost and high-efciency gas extraction [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Shu

Zhao

Mei

et al. 2023

Mathematical Problems in Engineering

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With the wide application of directional drilling technology in coal mine predraining boreholes, the failure problem of the tool joint of the directional drill pipe has become one of the main factors restricting the drilling efficiency. The main reason for the failure problem of the tool joint of the directional drill pipe is the stress concentration. The stress test rig for the tool joint of the directional drill pipe is designed based on the resistance strain measurement method, and the stress of the tool joint of the directional drill pipe is tested. The tool joint’s 3D finite element model was established based on nonlinear contact theory. The experiment verified the accuracy of this model. The stress distribution of the tool joint of the directional drill pipe was obtained. The research shows that the stress of the tool joint of the directional drill pipe is concentrated at the root between the third and the fourth turn of the engaged thread. The work presented in this study is a reliable guide to the design and field use of the tool joint of the directional drill pipe.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Shu

Zhao

Mei

et al. 2023

Mathematical Problems in Engineering

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show abstract

“…Previous studies have made remarkable achievements in stimulation technologies for gas extraction. The prominent technologies include deep hole presplitting and blasting, 4 hydraulic punching, 5 cavitation and fracture-adding, 6 hydraulic fracturing, hydraulic cutting, 7 physicochemical method, 8 gas injection displacement, 9 heat injection, 10 and physical field excitation. 11 Due to the limitation of technology and the difference in coal seam conditions, these technologies still have some defects and cannot be popularized comprehensively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Influence of Microwave Radiation on Coal Permeability and Microstructure

Wang

Gao

et al. 2021

ACS Omega

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At present, there is limited information available about the effects of microwave radiation on desorption characteristics, microstructures, and functional groups of coal. This research focuses on the influence of microwave radiation on coal sample desorption and examines the changes in pore structures and oxygenic groups of different coal samples using liquid nitrogen adsorption, nuclear magnetic resonance, and X-ray photoelectron spectroscopy. Results prove that the methane desorption capacity and desorption rate are proportional to the increase in microwave energy; the initial dynamic diffusion coefficient is also proportional to microwave energy but negatively proportional to the attenuation coefficient. As a result of microwave radiation, the Brunauer–Emmett–Teller (BET) surface area, pore size, and Barret–Joyner–Halenda (BJH) pore volume decreased. The specific surface area of BET decreased and then increased as microwave energy increased, while the average pore size increased and then decreased. However, the change in the BJH cumulative adsorption pore volume was complicated. The microwave radiation decreases the volume and number of micropores while increasing the volume and number of medium pores. With the increase in microwave energy, the number and volume of micropores continue to decrease, while the number and volume of medium pores continue to increase. An increase in microwave energy increased the surface area of oxygenic groups with the increasing relative content of COO–, C–O, and C=O bonds; however, the relative content of C–C/C–H bonds decreased. These findings deepen the understanding of the antireflection effects of microwaves on coal.

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“…Numerical simulation often simplifies the actual situation. At present, the commonly used numerical simulation methods for proppant migration are divided into E-L (Eulerian-Lagrangian) method (Akhshik et al, 2015;Wang et al, 2019) and E-E (Eulerian-Eulerian) method (Xiong et al, 2021). The E-L method regards fluid as the continuous phase and solid particles as a discrete phase for modeling and calculation.…”

Section: Introductionmentioning

confidence: 99%

Migration and Distribution Characteristics of Proppant at the Corner of Horizontal Fracture Network in Coal Seam

Cheng

Huang

et al. 2021

Front. Earth Sci.

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A complex fracture network is composed of many similar structures. The migration law of proppant at each structure is the core and basic content of the migration law of proppant in complex fracture network, and there is little research. In this study, the EulerianEulerian method (TEM) is used to analyze the migration and distribution characteristics of solid–liquid two phases at the fracture corner according to different corner types of the fracture network. The results show that the migration characteristics of proppant in the corner area can be divided into the corner anomaly area, buffer area, and stability area; the influence of the turning angle on proppant migration is mainly concentrated at the corner and in the range of 4 times the fracture width after turning. The probability of sand plugging at the corner of the “Y → T” fracture is lower than that of “L → l”, higher than that of the “X → +” wing branch fracture, and lower than that of the main fracture. At the corner of the fracture network, after the solid flow turns, the proppant will form a high sand area on the side of the impact fracture surface, then rebound back to the fracture, form a sand-free area on the other side, and form a high-velocity core in the refraction interval. At the corner of the “L → l” fracture, there are one high sand area, one non-sand area, two low-velocity areas, and one high-velocity area; there are three low-velocity areas, two sand-free areas, and one high sand area at the corner of the “Y → T” fracture; at the corner of the “X → +” fracture, there is a high sand area and no sand-free area, and the flow velocity of the main fracture is much greater than that of the wing branch fracture.

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A liquid‐solid model to optimize the application of friction reducers for hydraulic fracturing/cutting in the underground coal mine

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 5 publications

References 51 publications

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Numerical Analysis of the Stress Distribution and Concentration Factors of the Tool Joint of the Directional Drill Pipe

Experimental Research on the Influence of Microwave Radiation on Coal Permeability and Microstructure

Migration and Distribution Characteristics of Proppant at the Corner of Horizontal Fracture Network in Coal Seam

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