Experimental Study on High-Energy Gas Fracturing Artificial Coal
The low permeability of coal seams has always been the main bottleneck restricting coalbed gas drainage. To improve the permeability of a coal seam, a high-energy gas fracturing technology is proposed. Firstly, based on the high-energy gas fracturing mechanism and gas production principle of fractur...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/22/11606 |
| _version_ | 1797466007385669632 |
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| author | Junjun Li Guofu Li Zheng Wang Mengfei Yu Junke Gao |
| author_facet | Junjun Li Guofu Li Zheng Wang Mengfei Yu Junke Gao |
| author_sort | Junjun Li |
| collection | DOAJ |
| description | The low permeability of coal seams has always been the main bottleneck restricting coalbed gas drainage. To improve the permeability of a coal seam, a high-energy gas fracturing technology is proposed. Firstly, based on the high-energy gas fracturing mechanism and gas production principle of fracturing agent, a fracturing agent applicable to coal reservoirs was developed, and its performance and sensitivity were tested. Then, a high-energy gas-fracturing simulated coal sample test was conducted, and the drilling wall pressure and strain of the simulated coal sample were tested. The results show that high-energy gas fracturing technology is a safe and efficient technical means for improving the permeability of coal reservoirs. The pressure–time curve of the borehole wall under the action of high-energy gas can be divided into three stages, namely, the rapid pressure-rising stage, steady pressure stage, and falling stage; the maximum pressure in the borehole is about several hundred MPa, and the pressure distribution in the borehole is not uniform. Compared with explosives blasting, the stress wave intensity in coal caused by the action of high-energy gases is low, the duration is short, and the peak stress attenuates slowly with increasing distance. Under the action of high-energy gas, no crush zone is generated near the borehole; the number of radial cracks produced is small but long. The extent of the fracture zone depends mainly on the quasi-static splitting wedge effect of the high-energy gas. |
| first_indexed | 2024-03-09T18:29:42Z |
| format | Article |
| id | doaj.art-c92d13524e7c4389971361fd859bcf4a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T18:29:42Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c92d13524e7c4389971361fd859bcf4a2023-11-24T07:38:00ZengMDPI AGApplied Sciences2076-34172022-11-0112221160610.3390/app122211606Experimental Study on High-Energy Gas Fracturing Artificial CoalJunjun Li0Guofu Li1Zheng Wang2Mengfei Yu3Junke Gao4State Key Laboratory of Coal and Coalbed Methane Co-Mining, Jincheng 048012, ChinaState Key Laboratory of Coal and Coalbed Methane Co-Mining, Jincheng 048012, ChinaState Key Laboratory of Coal and Coalbed Methane Co-Mining, Jincheng 048012, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, ChinaHubei Institute of Aerospace Chemistry Technology, Xiangyang 441003, ChinaThe low permeability of coal seams has always been the main bottleneck restricting coalbed gas drainage. To improve the permeability of a coal seam, a high-energy gas fracturing technology is proposed. Firstly, based on the high-energy gas fracturing mechanism and gas production principle of fracturing agent, a fracturing agent applicable to coal reservoirs was developed, and its performance and sensitivity were tested. Then, a high-energy gas-fracturing simulated coal sample test was conducted, and the drilling wall pressure and strain of the simulated coal sample were tested. The results show that high-energy gas fracturing technology is a safe and efficient technical means for improving the permeability of coal reservoirs. The pressure–time curve of the borehole wall under the action of high-energy gas can be divided into three stages, namely, the rapid pressure-rising stage, steady pressure stage, and falling stage; the maximum pressure in the borehole is about several hundred MPa, and the pressure distribution in the borehole is not uniform. Compared with explosives blasting, the stress wave intensity in coal caused by the action of high-energy gases is low, the duration is short, and the peak stress attenuates slowly with increasing distance. Under the action of high-energy gas, no crush zone is generated near the borehole; the number of radial cracks produced is small but long. The extent of the fracture zone depends mainly on the quasi-static splitting wedge effect of the high-energy gas.https://www.mdpi.com/2076-3417/12/22/11606simulation coalhigh-energy gas fracturingstress wave propagation and attenuation lawpressure in the borehole wallexperimental study |
| spellingShingle | Junjun Li Guofu Li Zheng Wang Mengfei Yu Junke Gao Experimental Study on High-Energy Gas Fracturing Artificial Coal Applied Sciences simulation coal high-energy gas fracturing stress wave propagation and attenuation law pressure in the borehole wall experimental study |
| title | Experimental Study on High-Energy Gas Fracturing Artificial Coal |
| title_full | Experimental Study on High-Energy Gas Fracturing Artificial Coal |
| title_fullStr | Experimental Study on High-Energy Gas Fracturing Artificial Coal |
| title_full_unstemmed | Experimental Study on High-Energy Gas Fracturing Artificial Coal |
| title_short | Experimental Study on High-Energy Gas Fracturing Artificial Coal |
| title_sort | experimental study on high energy gas fracturing artificial coal |
| topic | simulation coal high-energy gas fracturing stress wave propagation and attenuation law pressure in the borehole wall experimental study |
| url | https://www.mdpi.com/2076-3417/12/22/11606 |
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