Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs
The plugging of nanopores in low-permeability coal reservoirs is an important factor that affects productivity reduction. However, the mechanism of plugging of the nanopores in coal reservoirs remains unclear. In this study, the coal samples from the Anze coalbed methane block of the North China Oil...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/8886426 |
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| author | Xiaopeng Zhai Weihong Chen Yun Xu Yishan Lou Shuhong Xu Lihui Zheng Zhiyang Guo Yuanchang Chen Hongyong Hao Jianfang Jiang |
| author_facet | Xiaopeng Zhai Weihong Chen Yun Xu Yishan Lou Shuhong Xu Lihui Zheng Zhiyang Guo Yuanchang Chen Hongyong Hao Jianfang Jiang |
| author_sort | Xiaopeng Zhai |
| collection | DOAJ |
| description | The plugging of nanopores in low-permeability coal reservoirs is an important factor that affects productivity reduction. However, the mechanism of plugging of the nanopores in coal reservoirs remains unclear. In this study, the coal samples from the Anze coalbed methane block of the North China Oilfield are used as the research object. Experiments are conducted on the mechanism of nanopore plugging by the variation of nanopore permeability based on the pressure oscillation method and the nanopore (scanning electron microscope) method. The research shows that the foreign working fluid invades a coal sample; the sample changes from being hydrophobic to being water absorbent within a certain period. The instability caused by the expansion of coal clay mineral particles promotes the dispersion and shedding of particles, and the migration of particles is accelerated under the shear stress of the working fluid. In addition, the viscosity and pressure difference of the working fluid are important factors that affect particle plugging. The viscosity of the fluid increased by two times, and permeability decreased by 1.21 times. As the pressure difference increases by two times, permeability can be reduced by up to two orders of magnitude. The findings of this study can help for better understanding of the mechanism of plugging of the nanopores in coal reservoirs and the reasons of production reduction in low-permeability coal reservoirs. Such findings provide theoretical support for the selection of the working fluid, and reasonable production pressure difference can effectively reduce the damage on coal permeability in a low-permeability coal reservoir. |
| format | Article |
| id | doaj-art-282a1891322d4a0d89bf974523096311 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-282a1891322d4a0d89bf9745230963112025-02-03T01:27:01ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/88864268886426Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal ReservoirsXiaopeng Zhai0Weihong Chen1Yun Xu2Yishan Lou3Shuhong Xu4Lihui Zheng5Zhiyang Guo6Yuanchang Chen7Hongyong Hao8Jianfang Jiang9Lost Circulation Prevention and Control Laboratory, National Engineering Laboratory for Oil and Gas Drilling Technology, Yangtze University, Wuhan, Hubei 430100, ChinaLost Circulation Prevention and Control Laboratory, National Engineering Laboratory for Oil and Gas Drilling Technology, Yangtze University, Wuhan, Hubei 430100, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaLost Circulation Prevention and Control Laboratory, National Engineering Laboratory for Oil and Gas Drilling Technology, Yangtze University, Wuhan, Hubei 430100, ChinaResearch Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, ChinaLost Circulation Prevention and Control Laboratory, National Engineering Laboratory for Oil and Gas Drilling Technology, Yangtze University, Wuhan, Hubei 430100, ChinaLost Circulation Prevention and Control Laboratory, National Engineering Laboratory for Oil and Gas Drilling Technology, Yangtze University, Wuhan, Hubei 430100, ChinaStructural Dynamics and Acoustic Systems Laboratory, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USAResearch Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, ChinaCollege of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaThe plugging of nanopores in low-permeability coal reservoirs is an important factor that affects productivity reduction. However, the mechanism of plugging of the nanopores in coal reservoirs remains unclear. In this study, the coal samples from the Anze coalbed methane block of the North China Oilfield are used as the research object. Experiments are conducted on the mechanism of nanopore plugging by the variation of nanopore permeability based on the pressure oscillation method and the nanopore (scanning electron microscope) method. The research shows that the foreign working fluid invades a coal sample; the sample changes from being hydrophobic to being water absorbent within a certain period. The instability caused by the expansion of coal clay mineral particles promotes the dispersion and shedding of particles, and the migration of particles is accelerated under the shear stress of the working fluid. In addition, the viscosity and pressure difference of the working fluid are important factors that affect particle plugging. The viscosity of the fluid increased by two times, and permeability decreased by 1.21 times. As the pressure difference increases by two times, permeability can be reduced by up to two orders of magnitude. The findings of this study can help for better understanding of the mechanism of plugging of the nanopores in coal reservoirs and the reasons of production reduction in low-permeability coal reservoirs. Such findings provide theoretical support for the selection of the working fluid, and reasonable production pressure difference can effectively reduce the damage on coal permeability in a low-permeability coal reservoir.http://dx.doi.org/10.1155/2021/8886426 |
| spellingShingle | Xiaopeng Zhai Weihong Chen Yun Xu Yishan Lou Shuhong Xu Lihui Zheng Zhiyang Guo Yuanchang Chen Hongyong Hao Jianfang Jiang Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs Geofluids |
| title | Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs |
| title_full | Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs |
| title_fullStr | Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs |
| title_full_unstemmed | Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs |
| title_short | Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs |
| title_sort | influence of migration and plugging of nanoparticles on coal permeability in coal reservoirs |
| url | http://dx.doi.org/10.1155/2021/8886426 |
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