Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin
The gas reservoirs in the Northwestern Sichuan Basin have great development potential. However, their production efficiency is seriously reduced by the complex surface multistage throttling process and frequent hydrate plugging caused by the ultra-high-pressure sour gas. Considering the prevention a...
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MDPI AG
2022-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/22/8641 |
| _version_ | 1797465373992288256 |
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| author | Zhaoqian Luo Qilin Liu Fan Yang Ziyuan Li Huanhuan Wang Bo Wang Zhouyu Peng Wenlong Jia |
| author_facet | Zhaoqian Luo Qilin Liu Fan Yang Ziyuan Li Huanhuan Wang Bo Wang Zhouyu Peng Wenlong Jia |
| author_sort | Zhaoqian Luo |
| collection | DOAJ |
| description | The gas reservoirs in the Northwestern Sichuan Basin have great development potential. However, their production efficiency is seriously reduced by the complex surface multistage throttling process and frequent hydrate plugging caused by the ultra-high-pressure sour gas. Considering the prevention and control of hydrates, properly designing the throttling temperature and pressure to optimize the surface production process is the key to solving this problem. First, this work presents a method for predicting the hydrate formation conditions of ultra-high-pressure sour natural gas based on the vdW-P (van der Waals–Platteeuw) model and the CPA (cubic-plus-association) equation of state (EoS) and considering the association between acid gases (H<sub>2</sub>S, CO<sub>2</sub>) and H<sub>2</sub>O. Secondly, the throttling temperature prediction method was developed by coupling the isenthalpic throttling model and the modified Lee–Kesler EoS mixing rule; the maximum throttling pressure difference calculation method was constructed based on the critical flow principle. Finally, field cases are given to illustrate the distribution process of assigning the maximum throttling pressure differences. The results show that the proposed model can accurately predict the hydrate formation conditions and throttling temperature of ultra-high-pressure sour natural gas, and reveal their changing laws. The surface throttling technology of the ultra-high-pressure sour gas wells Long 004-X1 and Long 016-H1 was optimized from five-stage to three-stage, and the application of the fixed throttle valve in the field is successfully demonstrated. |
| first_indexed | 2024-03-09T18:21:32Z |
| format | Article |
| id | doaj.art-708e686c522e43bfabf6d6d846653e3e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T18:21:32Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-708e686c522e43bfabf6d6d846653e3e2023-11-24T08:16:15ZengMDPI AGEnergies1996-10732022-11-011522864110.3390/en15228641Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan BasinZhaoqian Luo0Qilin Liu1Fan Yang2Ziyuan Li3Huanhuan Wang4Bo Wang5Zhouyu Peng6Wenlong Jia7Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, ChinaNorthwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, ChinaPetroleum Engineering School, Southwest Petroleum University, Chengdu 610500, ChinaPetroleum Engineering School, Southwest Petroleum University, Chengdu 610500, ChinaNorthwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, ChinaPetroleum Engineering School, Southwest Petroleum University, Chengdu 610500, ChinaNorthwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, ChinaPetroleum Engineering School, Southwest Petroleum University, Chengdu 610500, ChinaThe gas reservoirs in the Northwestern Sichuan Basin have great development potential. However, their production efficiency is seriously reduced by the complex surface multistage throttling process and frequent hydrate plugging caused by the ultra-high-pressure sour gas. Considering the prevention and control of hydrates, properly designing the throttling temperature and pressure to optimize the surface production process is the key to solving this problem. First, this work presents a method for predicting the hydrate formation conditions of ultra-high-pressure sour natural gas based on the vdW-P (van der Waals–Platteeuw) model and the CPA (cubic-plus-association) equation of state (EoS) and considering the association between acid gases (H<sub>2</sub>S, CO<sub>2</sub>) and H<sub>2</sub>O. Secondly, the throttling temperature prediction method was developed by coupling the isenthalpic throttling model and the modified Lee–Kesler EoS mixing rule; the maximum throttling pressure difference calculation method was constructed based on the critical flow principle. Finally, field cases are given to illustrate the distribution process of assigning the maximum throttling pressure differences. The results show that the proposed model can accurately predict the hydrate formation conditions and throttling temperature of ultra-high-pressure sour natural gas, and reveal their changing laws. The surface throttling technology of the ultra-high-pressure sour gas wells Long 004-X1 and Long 016-H1 was optimized from five-stage to three-stage, and the application of the fixed throttle valve in the field is successfully demonstrated.https://www.mdpi.com/1996-1073/15/22/8641Northwestern Sichuan Basinultra-high-pressuresour natural gasthrottling technologyhydrateCPA equation of state |
| spellingShingle | Zhaoqian Luo Qilin Liu Fan Yang Ziyuan Li Huanhuan Wang Bo Wang Zhouyu Peng Wenlong Jia Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin Energies Northwestern Sichuan Basin ultra-high-pressure sour natural gas throttling technology hydrate CPA equation of state |
| title | Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin |
| title_full | Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin |
| title_fullStr | Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin |
| title_full_unstemmed | Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin |
| title_short | Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin |
| title_sort | research and application of surface throttling technology for ultra high pressure sour natural gas wells in northwestern sichuan basin |
| topic | Northwestern Sichuan Basin ultra-high-pressure sour natural gas throttling technology hydrate CPA equation of state |
| url | https://www.mdpi.com/1996-1073/15/22/8641 |
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