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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Experiment on Rock-erosion Features with Combined Swirling and Round Jet of Supercritical Carbon Dioxide under the Ambient Pressure Condition

DOI: 10.1615/TFESC1.tia.012954
pages 2065-2082




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

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


KEY WORDS: supercritical carbon dioxide dual-jet numerical simulation flow field characteristics

Abstract

It is well accepted that the threshold bit weight for rock erosion using Supercritical carbon dioxide (SC-CO2) jet is relative smaller than that using conventional drilling fluid. On the other hand, combined swirling and round jet enjoys high rock erosion efficiency taking the advantages of both swirling and round jet. To fully utilizing those two technologies, a new rock erosion method called Combined Swirling and Round Jet of Supercritical Carbon Dioxide is put . To reveal the rock erosion law, the nozzle is designed and used in experiment to investigate the influence on rock erosion of several important parameters including length of guiding wheel, the center diameter of guiding wheel, the length of mixing chamber, standoff distance, and jet pressure. The result reveals that this new rock erosion method can lead to the occurrence of large rock mass breakaway. With the length of guiding wheel, the length of mixing chamber and standoff distance increasing, the erosion performance initially improves and then declines, existing optimal value. The increasing of the center diameter of guiding wheel can result in deepening erosion depth but reducing erosion diameter; erosion efficiency can be enhanced by increasing the jet pressure. The results of the study can be used as experimental basis for its further research.

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