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Atomization and Sprays
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ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2015012192
pages 659-671

ROCK-BREAKING CHARACTERISTICS FOR THE COMBINED SWIRLING AND STRAIGHT SUPERCRITICAL CARBON DIOXIDE JET UNDER AMBIENT PRESSURE

Shouceng Tian
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
Qilong Zhang
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; CNOOC China Limited, Tianjin Branch, Tianjin 300452, China
Gensheng Li
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China
Huanpeng Chi
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; Oil & Gas Survey, China Geological Survey, Beijing 100037, China
Haizhu Wang
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China
Kewen Peng
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China
Zhaokun Li
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China

要約

It is widely accepted that the rock-breaking threshold pressure for rock erosion using the supercritical carbon dioxide (SC-CO2) jet is lower than that for conventional drilling fluid. A combined swirling and straight jet nozzle was designed to incorporate the advantages of the swirling jet and the straight jet. To fully utilize the SC-CO2 and the combined swirling and straight jet, a novel rock-breaking method that uses the combined swirling and straight SC-CO2 jet is presented. Experiments were performed to investigate the influence of important parameters on rock-breaking performance, including the length and center diameter of the impeller, the length of the mixing chamber, the standoff distance, and the jet pressure. The results reveal that this novel rock-breaking method can achieve a large rock erosion volume. As the impeller length, mixing-chamber length, and standoff distance increase, the rock-breaking performance initially improves and then declines, indicating that optimal values exist. An increased center diameter of impeller can result in deeper breaking but reduces rock-breaking diameter. Moreover, the rock-breaking efficiency can be enhanced by increasing the jet pressure. The results of this study can be used as an experimental basis for further research.


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