NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development
Shale gas reservoirs have pores of various sizes, in which gas flows in different patterns. The coexistence of multiple gas flow patterns is common. In order to quantitatively characterize the flow pattern in the process of shale gas depletion development, a physical simulation experiment of shale g...
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/3021326 |
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| author | Rui Shen Zhiming Hu Xianggang Duan Wei Sun Wei Xiong Hekun Guo |
| author_facet | Rui Shen Zhiming Hu Xianggang Duan Wei Sun Wei Xiong Hekun Guo |
| author_sort | Rui Shen |
| collection | DOAJ |
| description | Shale gas reservoirs have pores of various sizes, in which gas flows in different patterns. The coexistence of multiple gas flow patterns is common. In order to quantitatively characterize the flow pattern in the process of shale gas depletion development, a physical simulation experiment of shale gas depletion development was designed, and a high-pressure on-line NMR analysis method of gas flow pattern in this process was proposed. The signal amplitudes of methane in pores of various sizes at different pressure levels were calculated according to the conversion relationship between the NMR T2 relaxation time and pore radius, and then, the flow patterns of methane in pores of various sizes under different pore pressure conditions were analyzed as per the flow pattern determination criteria. It is found that there are three flow patterns in the process of shale gas depletion development, i.e., continuous medium flow, slip flow, and transitional flow, which account for 73.5%, 25.8%, and 0.7% of total gas flow, respectively. When the pore pressure is high, the continuous medium flow is dominant. With the gas production in shale reservoir, the pore pressure decreases, the Knudsen number increases, and the pore size range of slip flow zone and transitional flow zone expands. When the reservoir pressure is higher than the critical desorption pressure, the adsorbed gas is not desorbed intensively, and the produced gas is mainly free gas. When the reservoir pressure is lower than the critical desorption pressure, the adsorbed gas is gradually desorbed, and the proportion of desorbed gas in the produced gas gradually increases. |
| format | Article |
| id | doaj-art-e5c66dfa8bc940b78e4a709784fbb538 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-e5c66dfa8bc940b78e4a709784fbb5382025-02-03T05:59:10ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/3021326NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion DevelopmentRui Shen0Zhiming Hu1Xianggang Duan2Wei Sun3Wei Xiong4Hekun Guo5Research Institute of Petroleum Exploration & DevelopmentResearch Institute of Petroleum Exploration & DevelopmentResearch Institute of Petroleum Exploration & DevelopmentResearch Institute of Petroleum Exploration & DevelopmentResearch Institute of Petroleum Exploration & DevelopmentResearch Institute of Petroleum Exploration & DevelopmentShale gas reservoirs have pores of various sizes, in which gas flows in different patterns. The coexistence of multiple gas flow patterns is common. In order to quantitatively characterize the flow pattern in the process of shale gas depletion development, a physical simulation experiment of shale gas depletion development was designed, and a high-pressure on-line NMR analysis method of gas flow pattern in this process was proposed. The signal amplitudes of methane in pores of various sizes at different pressure levels were calculated according to the conversion relationship between the NMR T2 relaxation time and pore radius, and then, the flow patterns of methane in pores of various sizes under different pore pressure conditions were analyzed as per the flow pattern determination criteria. It is found that there are three flow patterns in the process of shale gas depletion development, i.e., continuous medium flow, slip flow, and transitional flow, which account for 73.5%, 25.8%, and 0.7% of total gas flow, respectively. When the pore pressure is high, the continuous medium flow is dominant. With the gas production in shale reservoir, the pore pressure decreases, the Knudsen number increases, and the pore size range of slip flow zone and transitional flow zone expands. When the reservoir pressure is higher than the critical desorption pressure, the adsorbed gas is not desorbed intensively, and the produced gas is mainly free gas. When the reservoir pressure is lower than the critical desorption pressure, the adsorbed gas is gradually desorbed, and the proportion of desorbed gas in the produced gas gradually increases.http://dx.doi.org/10.1155/2022/3021326 |
| spellingShingle | Rui Shen Zhiming Hu Xianggang Duan Wei Sun Wei Xiong Hekun Guo NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development Geofluids |
| title | NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development |
| title_full | NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development |
| title_fullStr | NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development |
| title_full_unstemmed | NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development |
| title_short | NMR Analysis Method of Gas Flow Pattern in the Process of Shale Gas Depletion Development |
| title_sort | nmr analysis method of gas flow pattern in the process of shale gas depletion development |
| url | http://dx.doi.org/10.1155/2022/3021326 |
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