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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-431-1

ISBN Online: 978-1-56700-430-4

First Thermal and Fluids Engineering Summer Conference
August, 9-12, 2015 , New York City, USA

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

Get access (open in a dialog) pages 2065-2082
DOI: 10.1615/TFESC1.tia.012954

要約

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.