Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection
ECBM displacement experiments are a direct way to observe the gas displacement process and efficiency by inspecting the produced gas composition and flow rate. We conducted two sets of ECBM experiments by injecting N2 and CO2 through four large parallel specimens (300×50×50 mm coal briquette). N2 or...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2014-01-01
|
| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/242947 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832548817808916480 |
|---|---|
| author | Liguo Wang Yuanping Cheng Yongkang Wang |
| author_facet | Liguo Wang Yuanping Cheng Yongkang Wang |
| author_sort | Liguo Wang |
| collection | DOAJ |
| description | ECBM displacement experiments are a direct way to observe the gas displacement process and efficiency by inspecting the produced gas composition and flow rate. We conducted two sets of ECBM experiments by injecting N2 and CO2 through four large parallel specimens (300×50×50 mm coal briquette). N2 or CO2 is injected at pressures of 1.5, 1.8, and 2.2 MPa and various crustal stresses. The changes in pressure along the briquette and the concentration of the gas mixture flowing out of the briquette were analyzed. Gas injection significantly enhances CBM recovery. Experimental recoveries of the original extant gas are in excess of 90% for all cases. The results show that the N2 breakthrough occurs earlier than the CO2 breakthrough. The breakthrough time of N2 is approximately 0.5 displaced volumes. Carbon dioxide, however, breaks through at approximately 2 displaced volumes. Coal can adsorb CO2, which results in a slower breakthrough time. In addition, ground stress significantly influences the displacement effect of the gas injection. |
| format | Article |
| id | doaj-art-5b4a0c12e1464da385872c0a577680c4 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-5b4a0c12e1464da385872c0a577680c42025-02-03T06:13:02ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/242947242947Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 InjectionLiguo Wang0Yuanping Cheng1Yongkang Wang2National Engineering Research Center for Coal & Gas Control, China University of Mining & Technology, Xuzhou 221116, ChinaNational Engineering Research Center for Coal & Gas Control, China University of Mining & Technology, Xuzhou 221116, ChinaNational Engineering Research Center for Coal & Gas Control, China University of Mining & Technology, Xuzhou 221116, ChinaECBM displacement experiments are a direct way to observe the gas displacement process and efficiency by inspecting the produced gas composition and flow rate. We conducted two sets of ECBM experiments by injecting N2 and CO2 through four large parallel specimens (300×50×50 mm coal briquette). N2 or CO2 is injected at pressures of 1.5, 1.8, and 2.2 MPa and various crustal stresses. The changes in pressure along the briquette and the concentration of the gas mixture flowing out of the briquette were analyzed. Gas injection significantly enhances CBM recovery. Experimental recoveries of the original extant gas are in excess of 90% for all cases. The results show that the N2 breakthrough occurs earlier than the CO2 breakthrough. The breakthrough time of N2 is approximately 0.5 displaced volumes. Carbon dioxide, however, breaks through at approximately 2 displaced volumes. Coal can adsorb CO2, which results in a slower breakthrough time. In addition, ground stress significantly influences the displacement effect of the gas injection.http://dx.doi.org/10.1155/2014/242947 |
| spellingShingle | Liguo Wang Yuanping Cheng Yongkang Wang Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection The Scientific World Journal |
| title | Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection |
| title_full | Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection |
| title_fullStr | Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection |
| title_full_unstemmed | Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection |
| title_short | Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection |
| title_sort | laboratory study of the displacement coalbed ch4 process and efficiency of co2 and n2 injection |
| url | http://dx.doi.org/10.1155/2014/242947 |
| work_keys_str_mv | AT liguowang laboratorystudyofthedisplacementcoalbedch4processandefficiencyofco2andn2injection AT yuanpingcheng laboratorystudyofthedisplacementcoalbedch4processandefficiencyofco2andn2injection AT yongkangwang laboratorystudyofthedisplacementcoalbedch4processandefficiencyofco2andn2injection |