THEORY AND EXPERIMENTAL STUDY OF THE SELF-EXCITED OSCILLATION PULSED JET NOZZLE

摘要

Comparing with usual continuous jet nozzle, the self-excited oscillation pulsed jet nozzle SEOPJN) can make jet generate a higher peak of pressure and larger scouring volume. And it can make jet increase the effective standoff distance, too. The basic theories of the SEOPJN are introduced.Some experimental results are shown. According to the results, using tricorn bits assembled the SEOPJN to drill oil well, the ROP increases by 8%～77%, and the rates of the footage for tricorn bit increases by 6.7%～44.0%.