Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage
The integration of hydraulic slotting and gas drainage techniques has become a mainstream technique for enhancing permeability in coal seams with low permeability. However, the mechanism of action of this process is unclear. In this paper, field experiment and laboratory tests are described that aim...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2014-08-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.32.8.647 |
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| author | Quanle Zou Baiquan Lin Jinyan Liang Ting Liu Yan Zhou Fazhi Yan Chuanjie Zhu |
| author_facet | Quanle Zou Baiquan Lin Jinyan Liang Ting Liu Yan Zhou Fazhi Yan Chuanjie Zhu |
| author_sort | Quanle Zou |
| collection | DOAJ |
| description | The integration of hydraulic slotting and gas drainage techniques has become a mainstream technique for enhancing permeability in coal seams with low permeability. However, the mechanism of action of this process is unclear. In this paper, field experiment and laboratory tests are described that aim at elucidating this process. Given the sensitivity and accuracy of test methods and their corresponding determination principles, a combination of mercury intrusion porosimetry and nitrogen gas adsorption was proposed as a complementary technique and the pore-size distribution (PSD) was obtained. It is shown that the proportion of minipores decreases remarkably, whereas that of the macropores gradually increases with the decrease in the distance from the slotted borehole. By contrast, the mesopores and micropores present insignificant changes. Meanwhile, the adsorption pore and the seepage pore show a similar variation in tendency with the minipores and macropores, respectively. Moreover, the specific surface area decreases substantially with the decrease in borehole distances. The integration of hydraulic slotting and gas drainage can lower the gas-adsorption properties and enhance the gas-seepage capacity within the disturbed zone significantly. The paper highlights the guiding factors for improving the enhanced coal bed methane recovery. |
| format | Article |
| id | doaj-art-033d1651f2a746ed8b06cbca302a9e7b |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2014-08-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-033d1651f2a746ed8b06cbca302a9e7b2025-01-02T02:59:15ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382014-08-013210.1260/0263-6174.32.8.647Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas DrainageQuanle Zou0Baiquan Lin1Jinyan Liang2Ting Liu3Yan Zhou4Fazhi Yan5Chuanjie Zhu6 State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, P.R.China State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, P.R.China Department of Safety Engineering, Xuzhou Higher Occupation School of Mechanical and Electrical Engineering in Jiangsu Province, Xuzhou 320305, P.R.China State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, P.R.China State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, P.R.China State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, P.R.China State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, P.R.ChinaThe integration of hydraulic slotting and gas drainage techniques has become a mainstream technique for enhancing permeability in coal seams with low permeability. However, the mechanism of action of this process is unclear. In this paper, field experiment and laboratory tests are described that aim at elucidating this process. Given the sensitivity and accuracy of test methods and their corresponding determination principles, a combination of mercury intrusion porosimetry and nitrogen gas adsorption was proposed as a complementary technique and the pore-size distribution (PSD) was obtained. It is shown that the proportion of minipores decreases remarkably, whereas that of the macropores gradually increases with the decrease in the distance from the slotted borehole. By contrast, the mesopores and micropores present insignificant changes. Meanwhile, the adsorption pore and the seepage pore show a similar variation in tendency with the minipores and macropores, respectively. Moreover, the specific surface area decreases substantially with the decrease in borehole distances. The integration of hydraulic slotting and gas drainage can lower the gas-adsorption properties and enhance the gas-seepage capacity within the disturbed zone significantly. The paper highlights the guiding factors for improving the enhanced coal bed methane recovery.https://doi.org/10.1260/0263-6174.32.8.647 |
| spellingShingle | Quanle Zou Baiquan Lin Jinyan Liang Ting Liu Yan Zhou Fazhi Yan Chuanjie Zhu Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage Adsorption Science & Technology |
| title | Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage |
| title_full | Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage |
| title_fullStr | Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage |
| title_full_unstemmed | Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage |
| title_short | Variation in the Pore Structure of Coal after Hydraulic Slotting and Gas Drainage |
| title_sort | variation in the pore structure of coal after hydraulic slotting and gas drainage |
| url | https://doi.org/10.1260/0263-6174.32.8.647 |
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