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Massive Hydraulic Fracturing to Control Gas Outbursts in Soft Coal Seams
https://orcid.org/0000-0003-2212-3290
https://orcid.org/0000-0002-9348-8345
Abstract As a special energy rock containing methane, coal mining often entails the fatal risk of gas outbursts due to the differential enrichment of methane. However, the current key preventative techniques such as mining a protective layer and pre-drainage of gas are not applicable to conventional soft coal seams. Based on a field study of the Xinyuan Coal Mine in the Qinshui Basin, a new technique for controlling gas outbursts through surface hydraulic fracturing of underground coal rock is proposed. The specific implementation includes drilling, perforation, fluid injection, pumping unit installation, and coal mining operation. The key parameters are the displacement (12 $ m^{3} $/min), fluid volume (2000 $ m^{3} $), and anionic surfactant fracturing fluid. Comparative analysis shows that such a high displacement can increase the net pressure, form a fracture network, and adjust the formation pressure. The massive amount of fracturing fluid expands the effective depth. The anionic surfactant sodium dodecyl benzene sulfonate (SDBS) contributes to the migration of the fracturing fluid and the inhibition of gas desorption. The field results reveal that the hydraulic fracture propagation distance reached 330 m. After fracturing, the maximum water content was 3.35 greater than the original content. The gas concentration, pure gas quantity, and average gas drainage volume of the boreholes reached 1.58, 1.96, and 2.98 times those of the unfractured roadway, respectively. Furthermore, although the measured gas content was 5.97–12.69 $ m^{3} $/t, no dynamic coal and gas phenomenon was detected. This technique is characterized by the fact that the fracturing fluid can drive away the free methane, inhibit the adsorbed methane, and slow down the gas emission rate, which eliminates the occurrence of gas outbursts from the soft coal seam.
Massive Hydraulic Fracturing to Control Gas Outbursts in Soft Coal Seams
https://orcid.org/0000-0003-2212-3290
https://orcid.org/0000-0002-9348-8345
Abstract As a special energy rock containing methane, coal mining often entails the fatal risk of gas outbursts due to the differential enrichment of methane. However, the current key preventative techniques such as mining a protective layer and pre-drainage of gas are not applicable to conventional soft coal seams. Based on a field study of the Xinyuan Coal Mine in the Qinshui Basin, a new technique for controlling gas outbursts through surface hydraulic fracturing of underground coal rock is proposed. The specific implementation includes drilling, perforation, fluid injection, pumping unit installation, and coal mining operation. The key parameters are the displacement (12 $ m^{3} $/min), fluid volume (2000 $ m^{3} $), and anionic surfactant fracturing fluid. Comparative analysis shows that such a high displacement can increase the net pressure, form a fracture network, and adjust the formation pressure. The massive amount of fracturing fluid expands the effective depth. The anionic surfactant sodium dodecyl benzene sulfonate (SDBS) contributes to the migration of the fracturing fluid and the inhibition of gas desorption. The field results reveal that the hydraulic fracture propagation distance reached 330 m. After fracturing, the maximum water content was 3.35 greater than the original content. The gas concentration, pure gas quantity, and average gas drainage volume of the boreholes reached 1.58, 1.96, and 2.98 times those of the unfractured roadway, respectively. Furthermore, although the measured gas content was 5.97–12.69 $ m^{3} $/t, no dynamic coal and gas phenomenon was detected. This technique is characterized by the fact that the fracturing fluid can drive away the free methane, inhibit the adsorbed methane, and slow down the gas emission rate, which eliminates the occurrence of gas outbursts from the soft coal seam.
Massive Hydraulic Fracturing to Control Gas Outbursts in Soft Coal Seams
https://orcid.org/0000-0003-2212-3290
https://orcid.org/0000-0002-9348-8345
Abstract As a special energy rock containing methane, coal mining often entails the fatal risk of gas outbursts due to the differential enrichment of methane. However, the current key preventative techniques such as mining a protective layer and pre-drainage of gas are not applicable to conventional soft coal seams. Based on a field study of the Xinyuan Coal Mine in the Qinshui Basin, a new technique for controlling gas outbursts through surface hydraulic fracturing of underground coal rock is proposed. The specific implementation includes drilling, perforation, fluid injection, pumping unit installation, and coal mining operation. The key parameters are the displacement (12 $ m^{3} $/min), fluid volume (2000 $ m^{3} $), and anionic surfactant fracturing fluid. Comparative analysis shows that such a high displacement can increase the net pressure, form a fracture network, and adjust the formation pressure. The massive amount of fracturing fluid expands the effective depth. The anionic surfactant sodium dodecyl benzene sulfonate (SDBS) contributes to the migration of the fracturing fluid and the inhibition of gas desorption. The field results reveal that the hydraulic fracture propagation distance reached 330 m. After fracturing, the maximum water content was 3.35 greater than the original content. The gas concentration, pure gas quantity, and average gas drainage volume of the boreholes reached 1.58, 1.96, and 2.98 times those of the unfractured roadway, respectively. Furthermore, although the measured gas content was 5.97–12.69 $ m^{3} $/t, no dynamic coal and gas phenomenon was detected. This technique is characterized by the fact that the fracturing fluid can drive away the free methane, inhibit the adsorbed methane, and slow down the gas emission rate, which eliminates the occurrence of gas outbursts from the soft coal seam.
Massive Hydraulic Fracturing to Control Gas Outbursts in Soft Coal Seams
Lyu, Shuaifeng (author) / Wang, Shengwei (author) / Li, Junyang (author) / Chen, Xiaojun (author) / Chen, Lichao (author) / Dong, Qingxiang (author) / Zhang, Xiaofei (author) / Huang, Pengcheng (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Failure localisation in coal seams during outbursts
| British Library Conference Proceedings | 1997
An Elastoplastic Softening Damage Model for Hydraulic Fracturing in Soft Coal Seams
| DOAJ | 2018
New Methods of Categorization of Coal Seams Prone to Coal and Gas Outbursts
| DOAJ | 2004
Experimental Study on Stress Transfer and Fracture Law During the Hydraulic Fracturing of Coal Seams
| Online Contents | 2021
Rio Blanco massive hydraulic fracturing demonstration
| TIBKAT | 1975