Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas
Gas-water relative permeability measurement is a common method to describe the flow process in gas reservoirs with water. However， the results of relative permeability measurements vary significantly between different test methods and types of cores. To deepen the understanding of the microscopic di...
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Editorial Office of Petroleum Geology and Recovery Efficiency
2025-03-01
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| Series: | Youqi dizhi yu caishoulu |
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| Online Access: | https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202310019&lang=en |
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| author | WANG Zhouhua ZHANG Hongyu ZHANG Juan LIAO Haoqi HUANG Shilin |
| author_facet | WANG Zhouhua ZHANG Hongyu ZHANG Juan LIAO Haoqi HUANG Shilin |
| author_sort | WANG Zhouhua |
| collection | DOAJ |
| description | Gas-water relative permeability measurement is a common method to describe the flow process in gas reservoirs with water. However， the results of relative permeability measurements vary significantly between different test methods and types of cores. To deepen the understanding of the microscopic distribution characteristics of fluid and flow mechanism during the gas-water flow process， this paper took YB Gas Field in Sichuan Basin as the research object and used nuclear magnetic resonance （NMR） technology to quantitatively describe the microscopic distribution of the two phases before and after relative permeability test. The distribution results were explained based on the gas-water two-phase flow mechanism obtained by the previous researchers with the visualization model. The results showed that the displacement efficiencies of micron-scale （>1 μm） pores during the water displacing gas and gas displacing water are basically the same with the two test methods， but the displacement efficiency in submicron-scale （0.1–1 μm） and nanoscale （<0.1 μm） pores during water displacing gas is relatively higher. Moreover， the water in the submicron-scale and nanoscale pores is not mainly produced during the gas displacing water. For fractured and porous cores， the displacement efficiencies in micron-scale pores of fractured cores are relatively low， while the displacement efficiencies in submicron-scale and nanoscale pores are relatively high. The difference in the microscopic distribution of fluids with the two test methods is mainly caused by the different capillary forces inside the pores， while the difference between the two types of cores is primarily due to the difference in their main flow channels. |
| format | Article |
| id | doaj-art-0eb94847f2be4ae295f7a577feae4504 |
| institution | OA Journals |
| issn | 1009-9603 |
| language | zho |
| publishDate | 2025-03-01 |
| publisher | Editorial Office of Petroleum Geology and Recovery Efficiency |
| record_format | Article |
| series | Youqi dizhi yu caishoulu |
| spelling | doaj-art-0eb94847f2be4ae295f7a577feae45042025-08-20T02:17:28ZzhoEditorial Office of Petroleum Geology and Recovery EfficiencyYouqi dizhi yu caishoulu1009-96032025-03-0132216316910.13673/j.pgre.2023100191009-9603（2025）02-0163-07Characterization of microscopic distribution of fluids during gas displacing water and water displacing gasWANG Zhouhua0ZHANG Hongyu1ZHANG Juan2LIAO Haoqi3HUANG Shilin4State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu City， Sichuan Province， 610500， ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu City， Sichuan Province， 610500， ChinaExploration and Development Research Institute of PetroChina Southwest Oil & Gasfield Company， Chengdu City， Sichuan Province， 610095， ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu City， Sichuan Province， 610500， ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu City， Sichuan Province， 610500， ChinaGas-water relative permeability measurement is a common method to describe the flow process in gas reservoirs with water. However， the results of relative permeability measurements vary significantly between different test methods and types of cores. To deepen the understanding of the microscopic distribution characteristics of fluid and flow mechanism during the gas-water flow process， this paper took YB Gas Field in Sichuan Basin as the research object and used nuclear magnetic resonance （NMR） technology to quantitatively describe the microscopic distribution of the two phases before and after relative permeability test. The distribution results were explained based on the gas-water two-phase flow mechanism obtained by the previous researchers with the visualization model. The results showed that the displacement efficiencies of micron-scale （>1 μm） pores during the water displacing gas and gas displacing water are basically the same with the two test methods， but the displacement efficiency in submicron-scale （0.1–1 μm） and nanoscale （<0.1 μm） pores during water displacing gas is relatively higher. Moreover， the water in the submicron-scale and nanoscale pores is not mainly produced during the gas displacing water. For fractured and porous cores， the displacement efficiencies in micron-scale pores of fractured cores are relatively low， while the displacement efficiencies in submicron-scale and nanoscale pores are relatively high. The difference in the microscopic distribution of fluids with the two test methods is mainly caused by the different capillary forces inside the pores， while the difference between the two types of cores is primarily due to the difference in their main flow channels.https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202310019&lang=engas-water two-phase flownmrmicroscopic distribution characteristicsflow mechanismrelative permeability curve |
| spellingShingle | WANG Zhouhua ZHANG Hongyu ZHANG Juan LIAO Haoqi HUANG Shilin Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas Youqi dizhi yu caishoulu gas-water two-phase flow nmr microscopic distribution characteristics flow mechanism relative permeability curve |
| title | Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas |
| title_full | Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas |
| title_fullStr | Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas |
| title_full_unstemmed | Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas |
| title_short | Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas |
| title_sort | characterization of microscopic distribution of fluids during gas displacing water and water displacing gas |
| topic | gas-water two-phase flow nmr microscopic distribution characteristics flow mechanism relative permeability curve |
| url | https://yqcs.publish.founderss.cn/thesisDetails#10.13673/j.pgre.202310019&lang=en |
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