An analytical model of the initiation pressure for multilayer tree-type hydraulic fracturing in gas-bearing coal seams

Zuo, Shaojie; Peng, Shouqing; Zhou, Daohong; Wang, Changwei; Zhang, Liang

doi:10.1007/s40948-022-00509-9

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Affected by the shortage of fossil energy and the greenhouse effect, all countries in the world are actively exploring new energy. , Coalbed methane is a new type of clean energy with broad application prospects, which has attracted the attention of governments all over the world. , According to the data of the International Energy Agency (IEA), the total global coalbed methane resources buried at a depth of less than 2000 m can reach 260 trillion m 3 , which is more than twice the proven reserves of conventional natural gas . However, the coal seams are less permeable and need to be hydraulically fractured to increase the permeability before the drainage of coalbed methane, especially in China. , Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure and plays an important role in the process of hydraulic fracturing. − …”

Section: Introductionmentioning

confidence: 99%

“… 1 , 2 Coalbed methane is a new type of clean energy with broad application prospects, which has attracted the attention of governments all over the world. 3 , 4 According to the data of the International Energy Agency (IEA), the total global coalbed methane resources buried at a depth of less than 2000 m can reach 260 trillion m 3 , which is more than twice the proven reserves of conventional natural gas. 5 However, the coal seams are less permeable and need to be hydraulically fractured to increase the permeability before the drainage of coalbed methane, especially in China.…”

Section: Introductionmentioning

confidence: 99%

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Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Li,

Sun,

et al. 2023

ACS Omega

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Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure, which plays a key role in the hydraulic fracturing effect. To compare the effect of clean water, clean fracturing fluid, and acid fracturing fluid on the pore structure of coal, this paper used high-pressure mercury injection (MIP), low-temperature N2 adsorption (LT-N2A), and scanning electron microscopy (SEM) to determine the pore structure of Guizhou bituminous coal before and after the action of fracturing fluid. The results show that clean water can cause mineral expansion and reduce pore volume by about 6% and clean fracturing fluid and acid fracturing fluid can increase pore volume by 3 and 12%, respectively, due to different degrees of acidity. The MIP data show that the pore structure of coal samples is more complex after the action of different fracturing fluids, and acidic fracturing fluids can increase the fractal dimension of the pore by about 7%. The LT-N2A data showed that the fractal dimension of micropores and transition pores decreased after the action of different fracturing fluids. In general, acid fracturing fluid has the best effect on the coal microstructure, followed by clean fracturing fluid, and the least effect on clean water.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Li,

Sun,

et al. 2023

ACS Omega

Self Cite

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Characterize the influences of hydraulic fracturing on preventing rock burst from the stress and vibration fields

Tian,

Gong,

Dou

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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Prediction of Fracture Initiation Pressure for Slotting-Directional Hydraulic Fracturing Based on the Anisotropy of Coal

Zheng

et al. 2023

Journal of Energy Resources Technology

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The precise estimation of fracture initiation pressure is crucial for the effective implementation of slotting-directional hydraulic fracturing methods in coal seams. Nonetheless, current models fail to account for the impact of the morphology of the slotted borehole and the anisotropy of coal. To address this issue, a three-dimensional model was created in this study, which simplified the slotted borehole as an elliptical medium and the coal as an orthotropic medium. Laboratory experiments were conducted to validate the model, and the findings regarding the changes in fracture initiation pressure and deflection angle due to various factors were presented. The calculated outcomes of the proposed model align with the observed pattern of the experimental results, and the numerical discrepancy falls within the acceptable range of 7%, showcasing the precision of the proposed model. A rise in the horizontal stress difference and a decrease in the depth of the slots will result in an elevation of the fracture initiation pressure and deflection angle. Additionally, the slotting angle will impact the distribution pattern of the fracture initiation pressure and deflection angle, underscoring the significance of these factors in the hydraulic fracturing of slotted boreholes.

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An analytical model of the initiation pressure for multilayer tree-type hydraulic fracturing in gas-bearing coal seams

Cited by 4 publications

References 42 publications

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Characterize the influences of hydraulic fracturing on preventing rock burst from the stress and vibration fields

Prediction of Fracture Initiation Pressure for Slotting-Directional Hydraulic Fracturing Based on the Anisotropy of Coal

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