Abstract: The self-excited oscillation cavity is the device that produces pulse jet. After it had been applied to the petroleum industry, great profit has been obtained. UP to now, little has been known about its structure character in order to make it work efficiently, it is necessary further research it. Therefore the characteristics of the inherent frequency and the relations with related parameters were analyzed in this paper. The theoretical formulas were verified by experiment. A new kind of cavity design method to the 4 1/2”mono-cone bit and 5”diamond bit installed the self-excited oscillation cavity were provided in this paper. At the same time, some fundamental studies for the fluid flow law and computer simulation were also accomplished.

Key words: the self-excited oscillation cavity, frequency characteristic, bit, design, computer simulation