Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles
Supercritical carbon dioxide (SCO<sub>2</sub>) jets are a promising method to assist drilling, enhance oil–gas production, and reduce greenhouse gas emissions. To further improve the drilling efficiency of SCO<sub>2</sub> jet-assisted drilling, organ-pipe nozzles were applied...
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oai:doaj.org-article:cc28c3bf13004b20bcd77aff1d0c2d9f2021-11-25T17:27:27ZExperimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles10.3390/en142276371996-1073https://doaj.org/article/cc28c3bf13004b20bcd77aff1d0c2d9f2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7637https://doaj.org/toc/1996-1073Supercritical carbon dioxide (SCO<sub>2</sub>) jets are a promising method to assist drilling, enhance oil–gas production, and reduce greenhouse gas emissions. To further improve the drilling efficiency of SCO<sub>2</sub> jet-assisted drilling, organ-pipe nozzles were applied to generate a self-excited oscillation SCO<sub>2</sub> jet (SEOSJ). The impact pressure oscillation and rock erosion capability of SEOSJs under both supercritical and gaseous CO<sub>2</sub> (GCO<sub>2</sub>) ambient conditions were experimentally investigated. It was found that the impact pressure oscillation characteristics of SEOSJs produced by organ-pipe nozzles are dramatically affected by the oscillation chamber length. The optimum range of the dimensionless chamber length to generate the highest impact pressure peak and the strongest pressure oscillation is within 7–9. The dimensionless pressure peak and the pressure ratio decreases gradually with increasing pressure difference, whereas the pressure oscillation intensity increases with increasing pressure difference and the increasing rate decreases gradually. The dominant frequency was observed to decrease monotonically with increasing chamber length but increases with the increase of pressure difference. Moreover, the comparison of impingement characteristics of SEOSJs under different ambient conditions showed that the values of dimensionless peak impact pressure are similar under the two ambient conditions, and the SEOSJ achieves higher pressure oscillation intensity and dominant frequency in SCO<sub>2</sub> at the same pressure difference. The rock breaking ability of the SEOSJ is closely related to its axial impact pressure. The erosion depth and mass loss of sandstone caused by the organ-pipe nozzle with the best impact pressure performance is higher than those produced by other nozzles. The SEOSJ results in a deeper and narrower crater in SCO<sub>2</sub> than in GCO<sub>2</sub> under the same pressure difference. The reported results provide guidance for SEOSJ applications and the design of an organ-pipe nozzle used for jet-assisted drilling.Mengda ZhangZhenlong FangYi’nan QianMDPI AGarticleunconventional energy resourcesjet-assisted drillingself-excited oscillationsupercritical carbon dioxide jetorgan-pipe nozzlerock erosionTechnologyTENEnergies, Vol 14, Iss 7637, p 7637 (2021) |
| institution |
DOAJ |
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DOAJ |
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EN |
| topic |
unconventional energy resources jet-assisted drilling self-excited oscillation supercritical carbon dioxide jet organ-pipe nozzle rock erosion Technology T |
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unconventional energy resources jet-assisted drilling self-excited oscillation supercritical carbon dioxide jet organ-pipe nozzle rock erosion Technology T Mengda Zhang Zhenlong Fang Yi’nan Qian Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles |
| description |
Supercritical carbon dioxide (SCO<sub>2</sub>) jets are a promising method to assist drilling, enhance oil–gas production, and reduce greenhouse gas emissions. To further improve the drilling efficiency of SCO<sub>2</sub> jet-assisted drilling, organ-pipe nozzles were applied to generate a self-excited oscillation SCO<sub>2</sub> jet (SEOSJ). The impact pressure oscillation and rock erosion capability of SEOSJs under both supercritical and gaseous CO<sub>2</sub> (GCO<sub>2</sub>) ambient conditions were experimentally investigated. It was found that the impact pressure oscillation characteristics of SEOSJs produced by organ-pipe nozzles are dramatically affected by the oscillation chamber length. The optimum range of the dimensionless chamber length to generate the highest impact pressure peak and the strongest pressure oscillation is within 7–9. The dimensionless pressure peak and the pressure ratio decreases gradually with increasing pressure difference, whereas the pressure oscillation intensity increases with increasing pressure difference and the increasing rate decreases gradually. The dominant frequency was observed to decrease monotonically with increasing chamber length but increases with the increase of pressure difference. Moreover, the comparison of impingement characteristics of SEOSJs under different ambient conditions showed that the values of dimensionless peak impact pressure are similar under the two ambient conditions, and the SEOSJ achieves higher pressure oscillation intensity and dominant frequency in SCO<sub>2</sub> at the same pressure difference. The rock breaking ability of the SEOSJ is closely related to its axial impact pressure. The erosion depth and mass loss of sandstone caused by the organ-pipe nozzle with the best impact pressure performance is higher than those produced by other nozzles. The SEOSJ results in a deeper and narrower crater in SCO<sub>2</sub> than in GCO<sub>2</sub> under the same pressure difference. The reported results provide guidance for SEOSJ applications and the design of an organ-pipe nozzle used for jet-assisted drilling. |
| format |
article |
| author |
Mengda Zhang Zhenlong Fang Yi’nan Qian |
| author_facet |
Mengda Zhang Zhenlong Fang Yi’nan Qian |
| author_sort |
Mengda Zhang |
| title |
Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles |
| title_short |
Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles |
| title_full |
Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles |
| title_fullStr |
Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles |
| title_full_unstemmed |
Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO<sub>2</sub> Jets Produced by Organ-Pipe Nozzles |
| title_sort |
experimental study on the impingement characteristics of self-excited oscillation supercritical co<sub>2</sub> jets produced by organ-pipe nozzles |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/cc28c3bf13004b20bcd77aff1d0c2d9f |
| work_keys_str_mv |
AT mengdazhang experimentalstudyontheimpingementcharacteristicsofselfexcitedoscillationsupercriticalcosub2subjetsproducedbyorganpipenozzles AT zhenlongfang experimentalstudyontheimpingementcharacteristicsofselfexcitedoscillationsupercriticalcosub2subjetsproducedbyorganpipenozzles AT yinanqian experimentalstudyontheimpingementcharacteristicsofselfexcitedoscillationsupercriticalcosub2subjetsproducedbyorganpipenozzles |
| _version_ |
1718412375658332160 |