The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential
Tight matrix has relatively low permeability and porosity, with abundant micro/nano pores. The capillary force in these pores are relatively strong, making the wetting liquid easier to be imbibed in the matrix. This process is called spontaneous imbibition. The complexity of pore structure is identi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-08-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/11/9/794 |
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| author | Caoxiong Li Chenggang Xian Jun Wang Dandan Geng Yinghao Shen |
| author_facet | Caoxiong Li Chenggang Xian Jun Wang Dandan Geng Yinghao Shen |
| author_sort | Caoxiong Li |
| collection | DOAJ |
| description | Tight matrix has relatively low permeability and porosity, with abundant micro/nano pores. The capillary force in these pores are relatively strong, making the wetting liquid easier to be imbibed in the matrix. This process is called spontaneous imbibition. The complexity of pore structure is identified as one of the key factors influencing the imbibition process, but the detailed mechanism is not clear. Thus, in this work, a method is proposed to evaluate the influence of pore structure on imbibition process. Pore structure has fractal properties in a specific scale. By using the fractal theory, an imbibition model is provided to analyze the influence of microscopic structures on spontaneous imbibition, considering the pore size distribution and pore connectivity. Also, based on this model, the influencing factors on dimensionless imbibition and diffusion rate are discussed. Results show that the pore structure has more branches, larger and shorter sub-throats has higher chance to gain a high imbibition rate. Finally, a 3D imbibition parameter cube is constructed to determine the parameter combinations in favor of strong water diffusion potential. By utilizing the analysis method based on the fractal theory, we can effectively evaluate the imbibition potential. It is helpful to provide a guidance to evaluate the water imbibition to gas production. |
| first_indexed | 2024-03-10T17:01:13Z |
| format | Article |
| id | doaj.art-bbcaf53049a04bf7be3f01d516bcda96 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T17:01:13Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-bbcaf53049a04bf7be3f01d516bcda962023-11-20T10:58:34ZengMDPI AGMicromachines2072-666X2020-08-0111979410.3390/mi11090794The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition PotentialCaoxiong Li0Chenggang Xian1Jun Wang2Dandan Geng3Yinghao Shen4Unconventional Oil and Natural Gas Institute, China University of Petroleum, Beijing 102249, ChinaUnconventional Oil and Natural Gas Institute, China University of Petroleum, Beijing 102249, ChinaThe No. 7 Oil Production Plant Company, Changqing Oilfield, CNPC, Xi’an 710000, ChinaThe No. 6 Oil Production Company, Daqing Oilfield, CNPC, Daqing 163114, ChinaUnconventional Oil and Natural Gas Institute, China University of Petroleum, Beijing 102249, ChinaTight matrix has relatively low permeability and porosity, with abundant micro/nano pores. The capillary force in these pores are relatively strong, making the wetting liquid easier to be imbibed in the matrix. This process is called spontaneous imbibition. The complexity of pore structure is identified as one of the key factors influencing the imbibition process, but the detailed mechanism is not clear. Thus, in this work, a method is proposed to evaluate the influence of pore structure on imbibition process. Pore structure has fractal properties in a specific scale. By using the fractal theory, an imbibition model is provided to analyze the influence of microscopic structures on spontaneous imbibition, considering the pore size distribution and pore connectivity. Also, based on this model, the influencing factors on dimensionless imbibition and diffusion rate are discussed. Results show that the pore structure has more branches, larger and shorter sub-throats has higher chance to gain a high imbibition rate. Finally, a 3D imbibition parameter cube is constructed to determine the parameter combinations in favor of strong water diffusion potential. By utilizing the analysis method based on the fractal theory, we can effectively evaluate the imbibition potential. It is helpful to provide a guidance to evaluate the water imbibition to gas production.https://www.mdpi.com/2072-666X/11/9/794tight matrixwater imbibitionpore structurefractal theory |
| spellingShingle | Caoxiong Li Chenggang Xian Jun Wang Dandan Geng Yinghao Shen The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential Micromachines tight matrix water imbibition pore structure fractal theory |
| title | The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential |
| title_full | The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential |
| title_fullStr | The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential |
| title_full_unstemmed | The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential |
| title_short | The Spontaneous Imbibition of Micro/Nano Structures in Tight Matrix and the Influence on Imbibition Potential |
| title_sort | spontaneous imbibition of micro nano structures in tight matrix and the influence on imbibition potential |
| topic | tight matrix water imbibition pore structure fractal theory |
| url | https://www.mdpi.com/2072-666X/11/9/794 |
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