Experimental Study on the Impingement Characteristics of Self-Excited Oscillation Supercritical CO 2 Jets Produced by Organ-Pipe Nozzles

Mengda Zhang, Zhenlong Fang and Yi’nan Qian
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Mengda Zhang: School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
Zhenlong Fang: School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China
Yi’nan Qian: School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China

Energies, 2021, vol. 14, issue 22, 1-15

Abstract: Supercritical carbon dioxide (SCO 2 ) 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 2 jet-assisted drilling, organ-pipe nozzles were applied to generate a self-excited oscillation SCO 2 jet (SEOSJ). The impact pressure oscillation and rock erosion capability of SEOSJs under both supercritical and gaseous CO 2 (GCO 2 ) 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 2 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 2 than in GCO 2 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.

Keywords: unconventional energy resources; jet-assisted drilling; self-excited oscillation; supercritical carbon dioxide jet; organ-pipe nozzle; rock erosion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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