Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater
A downhole electric tubular resistive heater is proposed for the oil-shale in situ resorting. After flowing through a set of heating tubes, the outlet temperature and the flow rate of the injected gas can be conveniently adjusted to match the requirement of the pyrolysis temperature of the oil shale...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/19/9508 |
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| author | Yu Chen Hao Zeng Jianli Wang Haoran Chen Jianjun Zhu |
| author_facet | Yu Chen Hao Zeng Jianli Wang Haoran Chen Jianjun Zhu |
| author_sort | Yu Chen |
| collection | DOAJ |
| description | A downhole electric tubular resistive heater is proposed for the oil-shale in situ resorting. After flowing through a set of heating tubes, the outlet temperature and the flow rate of the injected gas can be conveniently adjusted to match the requirement of the pyrolysis temperature of the oil shale. The calculation demonstrates the effects of the inner diameter, the length of the heating tube, and the inlet flow rate on the heat transfer performance of the electric heater. It was found that, compared with the armored electric heaters, even with a small inject flow rate of 5 Nm<sup>3</sup>/min, the convective heat transfer coefficient of the inner flow exceeds 300 W/m<sup>2</sup> K, resulting in a much smaller thermal resistance. The outlet temperature of the heating gas can conveniently reach up to 900 °C with the absence of the complex structure of enhanced fins. Though the pressure loss is relatively larger under a high flow rate, the comprehensive index is still 40% higher, indicating that the present tubular electric heater is a promising candidate to deal with complex downhole conditions. |
| first_indexed | 2024-03-09T22:07:04Z |
| format | Article |
| id | doaj.art-fcf2de1b3bb24ab3871af460bfef93f3 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:07:04Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-fcf2de1b3bb24ab3871af460bfef93f32023-11-23T19:40:50ZengMDPI AGApplied Sciences2076-34172022-09-011219950810.3390/app12199508Heat Transfer Performance of a Downhole Electric Tubular Resistive HeaterYu Chen0Hao Zeng1Jianli Wang2Haoran Chen3Jianjun Zhu4State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, ChinaState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, ChinaJiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, ChinaJiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, ChinaCollege of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, ChinaA downhole electric tubular resistive heater is proposed for the oil-shale in situ resorting. After flowing through a set of heating tubes, the outlet temperature and the flow rate of the injected gas can be conveniently adjusted to match the requirement of the pyrolysis temperature of the oil shale. The calculation demonstrates the effects of the inner diameter, the length of the heating tube, and the inlet flow rate on the heat transfer performance of the electric heater. It was found that, compared with the armored electric heaters, even with a small inject flow rate of 5 Nm<sup>3</sup>/min, the convective heat transfer coefficient of the inner flow exceeds 300 W/m<sup>2</sup> K, resulting in a much smaller thermal resistance. The outlet temperature of the heating gas can conveniently reach up to 900 °C with the absence of the complex structure of enhanced fins. Though the pressure loss is relatively larger under a high flow rate, the comprehensive index is still 40% higher, indicating that the present tubular electric heater is a promising candidate to deal with complex downhole conditions.https://www.mdpi.com/2076-3417/12/19/9508downhole electric tubular resistive heaterin situ resortingcomprehensive indexoil shale |
| spellingShingle | Yu Chen Hao Zeng Jianli Wang Haoran Chen Jianjun Zhu Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater Applied Sciences downhole electric tubular resistive heater in situ resorting comprehensive index oil shale |
| title | Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater |
| title_full | Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater |
| title_fullStr | Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater |
| title_full_unstemmed | Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater |
| title_short | Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater |
| title_sort | heat transfer performance of a downhole electric tubular resistive heater |
| topic | downhole electric tubular resistive heater in situ resorting comprehensive index oil shale |
| url | https://www.mdpi.com/2076-3417/12/19/9508 |
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