Energy Concentrated and Self-Resonating Mini-Extended Jet Nozzle Used for Jet Drilling

[+] Author and Article Information
B. J. Sun, D. C. Yan

Department of Mechanics, Peking University, Beijing, Peoples Republic of China 100871

J. Fluids Eng 121(2), 391-395 (Jun 01, 1999) (5 pages) doi:10.1115/1.2822219 History: Received October 14, 1997; Revised January 06, 1999; Online January 22, 2008


Theoretical, experimental, and field test studies of the self-resonating pulsating jet have been carried out. The interaction mechanism of vortices and outlet wall is described. On the basis of theoretical calculations and experimental data, a new mini-extended and energy concentrated self-resonating pulsating jet nozzle can be recommended. Hydrodynamic experiments, rock erosion tests, and field tests in a drilling engineering environment were carried out using the new nozzle. The results show that the new nozzle has stronger erosion capability than the cone-type or conventional organ-pipe self-resonating nozzle jet. The field test results in drilling engineering show that the outlets of the newly designed nozzles have strong anti-scouring ability. The new exit design of the nozzle can increase its life span.

Copyright © 1999 by The American Society of Mechanical Engineers
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