Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties
Permeability of sandstones with different properties taken from Chongqing reservoirs has been measured and deeply discussed under increasing deviatoric stress. Corresponding to the distinct features in the stress-strain behaviors, the permeability of sandstones is found to evolve with a clear permea...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2018/5327895 |
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| author | Xianshan Liu Ming Xu Ke Wang |
| author_facet | Xianshan Liu Ming Xu Ke Wang |
| author_sort | Xianshan Liu |
| collection | DOAJ |
| description | Permeability of sandstones with different properties taken from Chongqing reservoirs has been measured and deeply discussed under increasing deviatoric stress. Corresponding to the distinct features in the stress-strain behaviors, the permeability of sandstones is found to evolve with a clear permeability decrease in the initial closure region, a constant permeability value in the elastic region, a permeability increase in the crack initiation and propagation region, a sharp permeability increase in the crack growth region, and a decrease permeability in the residual stage. The results also show that the variation patterns of permeability are similar for two reservoir sandstones under combination of confining pressure and water pressure; however, the strength and permeability are smaller for the sandstone with mud than that without mud, deeply indicating that mud-like materials have a relatively great impact on the mechanical properties and permeability, so mud components cannot be ignored for prediction of reservoir permeability. Furthermore, a statistical damage constitutive model considering hydraulic-mechanical coupling process is presented to calculate the damage variable D, illustrating that larger water pressure will result in a relatively smaller damage variables D and corresponding maximum, which explains that the permeability increases more rapidly and is larger for the sandstone without mud than that with mud, and sandstone damage related to corresponding circumferential crack strain and permeability has been investigated, also implying the evolution mechanism of permeability for two sandstones with different physical properties. Therefore, it is worth pointing out that rock physical properties have a great influence on the reservoir permeability under complex extraction conditions and cannot be ignored, which is necessary to improve the recovery ratio and productivity. |
| format | Article |
| id | doaj-art-bba6b984a77e4e42b74a0d27ffebac56 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-bba6b984a77e4e42b74a0d27ffebac562025-02-03T07:25:18ZengWileyGeofluids1468-81151468-81232018-01-01201810.1155/2018/53278955327895Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical PropertiesXianshan Liu0Ming Xu1Ke Wang2Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaKey Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, ChinaPermeability of sandstones with different properties taken from Chongqing reservoirs has been measured and deeply discussed under increasing deviatoric stress. Corresponding to the distinct features in the stress-strain behaviors, the permeability of sandstones is found to evolve with a clear permeability decrease in the initial closure region, a constant permeability value in the elastic region, a permeability increase in the crack initiation and propagation region, a sharp permeability increase in the crack growth region, and a decrease permeability in the residual stage. The results also show that the variation patterns of permeability are similar for two reservoir sandstones under combination of confining pressure and water pressure; however, the strength and permeability are smaller for the sandstone with mud than that without mud, deeply indicating that mud-like materials have a relatively great impact on the mechanical properties and permeability, so mud components cannot be ignored for prediction of reservoir permeability. Furthermore, a statistical damage constitutive model considering hydraulic-mechanical coupling process is presented to calculate the damage variable D, illustrating that larger water pressure will result in a relatively smaller damage variables D and corresponding maximum, which explains that the permeability increases more rapidly and is larger for the sandstone without mud than that with mud, and sandstone damage related to corresponding circumferential crack strain and permeability has been investigated, also implying the evolution mechanism of permeability for two sandstones with different physical properties. Therefore, it is worth pointing out that rock physical properties have a great influence on the reservoir permeability under complex extraction conditions and cannot be ignored, which is necessary to improve the recovery ratio and productivity.http://dx.doi.org/10.1155/2018/5327895 |
| spellingShingle | Xianshan Liu Ming Xu Ke Wang Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties Geofluids |
| title | Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties |
| title_full | Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties |
| title_fullStr | Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties |
| title_full_unstemmed | Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties |
| title_short | Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties |
| title_sort | mechanism of permeability evolution for reservoir sandstone with different physical properties |
| url | http://dx.doi.org/10.1155/2018/5327895 |
| work_keys_str_mv | AT xianshanliu mechanismofpermeabilityevolutionforreservoirsandstonewithdifferentphysicalproperties AT mingxu mechanismofpermeabilityevolutionforreservoirsandstonewithdifferentphysicalproperties AT kewang mechanismofpermeabilityevolutionforreservoirsandstonewithdifferentphysicalproperties |