التفاصيل البيبلوغرافية
| العنوان: |
Permeability evolution in sorbing media: analogies between organic-rich shale and coal |
| المؤلفون: |
H K U M A R, D E L S W O R T H, J P Mathews, A N, D C, John, Willie Leone, Hemant Kumar |
| المساهمون: |
The Pennsylvania State University CiteSeerX Archives |
| المصدر: |
http://www3.geosc.psu.edu/%7Ecjm38/papers_talks/Kumaretal_Geofluids2015.pdfTest. |
| سنة النشر: |
2015 |
| المجموعة: |
CiteSeerX |
| الوصف: |
Shale gas reservoirs like coalbed methane (CBM) reservoirs are promising targets for geological sequestration of carbon dioxide (CO 2 ). However, the evolution of permeability in shale reservoirs on injection of CO 2 is poorly understood unlike CBM reservoirs. In this study, we report measurements of permeability evolution in shales infiltrated separately by nonsorbing (He) and sorbing (CO 2 ) gases under varying gas pressures and confining stresses. Experiments are completed on Pennsylvanian shales containing both natural and artificial fractures under nonpropped and propped conditions. We use the models for permeability evolution in coal (Journal of Petroleum Science and Engineering, Under Revision) to codify the permeability evolution observed in the shale samples. It is observed that for a naturally fractured shale, the He permeability increases by approximately 15% as effective stress is reduced by increasing the gas pressure from 1 MPa to 6 MPa at constant confining stress of 10 MPa. Conversely, the CO 2 permeability reduces by a factor of two under similar conditions. A second core is split with a fine saw to create a smooth artificial fracture and the permeabilities are measured for both nonpropped and propped fractures. The He permeability of a propped artificial fracture is approximately 2-to 3fold that of the nonpropped fracture. The He permeability increases with gas pressure under constant confining stress for both nonpropped and propped cases. However, the CO 2 permeability of the propped fracture decreases by between one-half to one-third as the gas pressure increases from 1 to 4 MPa at constant confining stress. Interestingly, the CO 2 permeability of nonpropped fracture increases with gas pressure at constant confining stress. The permeability evolution of nonpropped and propped artificial fractures in shale is found to be similar to those observed in coals but the extent of permeability reduction by swelling is much lower in shale due to its lower organic content. Optical profilometry ... |
| نوع الوثيقة: |
text |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| العلاقة: |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.3824Test; http://www3.geosc.psu.edu/%7Ecjm38/papers_talks/Kumaretal_Geofluids2015.pdfTest |
| الإتاحة: |
http://www3.geosc.psu.edu/%7Ecjm38/papers_talks/Kumaretal_Geofluids2015.pdfTest |
| حقوق: |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: |
edsbas.7177C5AD |
| قاعدة البيانات: |
BASE |
