The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China
Gas outburst has always affected the safety of coal mining. To eliminate this risk by high-efficiency extraction of coalbed methane (CBM) in 4102 working face of number 3 coal seam in Hebi Number 3 coal mine, a model of CBM extraction in working face was established which was considering the mining...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2018/4034296 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832559018934009856 |
|---|---|
| author | Liqiang Zhang Yu Wu Hai Pu Xiaoping He Pan Li |
| author_facet | Liqiang Zhang Yu Wu Hai Pu Xiaoping He Pan Li |
| author_sort | Liqiang Zhang |
| collection | DOAJ |
| description | Gas outburst has always affected the safety of coal mining. To eliminate this risk by high-efficiency extraction of coalbed methane (CBM) in 4102 working face of number 3 coal seam in Hebi Number 3 coal mine, a model of CBM extraction in working face was established which was considering the mining impact of adjacent 4101 working face. In this model, the coupling relationships between stress, desorption, and migration of methane were analyzed. Moreover, we also studied the changes of methane pressure, plastic failure scope, and permeability of coal during the mining and then verified the results with the field data. And on this basis, a stimulation solution for methane extraction by injecting air into coal seam was presented, and the extraction effect was simulated. The simulation results show that the injection of air decreases the effective stress of coal which increases the permeability of coal and promotes the methane migration within the coal seam fractures. Besides, affected by the velocity of gas migration, the pressure drop between fractures and matrix will reduce with time while air injection can provide extra power for gas migration in fractures which causes the desorption and diffusion of methane in the matrix. So this stimulation solution can enhance the efficiency of gas extraction of coal seam and prevent gas outburst of the working face. |
| format | Article |
| id | doaj-art-9b272ce65b6442558f237ce3254f62e0 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-9b272ce65b6442558f237ce3254f62e02025-02-03T01:31:05ZengWileyGeofluids1468-81151468-81232018-01-01201810.1155/2018/40342964034296The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in ChinaLiqiang Zhang0Yu Wu1Hai Pu2Xiaoping He3Pan Li4State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, ChinaGas outburst has always affected the safety of coal mining. To eliminate this risk by high-efficiency extraction of coalbed methane (CBM) in 4102 working face of number 3 coal seam in Hebi Number 3 coal mine, a model of CBM extraction in working face was established which was considering the mining impact of adjacent 4101 working face. In this model, the coupling relationships between stress, desorption, and migration of methane were analyzed. Moreover, we also studied the changes of methane pressure, plastic failure scope, and permeability of coal during the mining and then verified the results with the field data. And on this basis, a stimulation solution for methane extraction by injecting air into coal seam was presented, and the extraction effect was simulated. The simulation results show that the injection of air decreases the effective stress of coal which increases the permeability of coal and promotes the methane migration within the coal seam fractures. Besides, affected by the velocity of gas migration, the pressure drop between fractures and matrix will reduce with time while air injection can provide extra power for gas migration in fractures which causes the desorption and diffusion of methane in the matrix. So this stimulation solution can enhance the efficiency of gas extraction of coal seam and prevent gas outburst of the working face.http://dx.doi.org/10.1155/2018/4034296 |
| spellingShingle | Liqiang Zhang Yu Wu Hai Pu Xiaoping He Pan Li The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China Geofluids |
| title | The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China |
| title_full | The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China |
| title_fullStr | The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China |
| title_full_unstemmed | The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China |
| title_short | The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China |
| title_sort | migration of coalbed methane under mining pressure and air injection a case study in china |
| url | http://dx.doi.org/10.1155/2018/4034296 |
| work_keys_str_mv | AT liqiangzhang themigrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT yuwu themigrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT haipu themigrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT xiaopinghe themigrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT panli themigrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT liqiangzhang migrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT yuwu migrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT haipu migrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT xiaopinghe migrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina AT panli migrationofcoalbedmethaneunderminingpressureandairinjectionacasestudyinchina |