Development and Test of Cavitation Jet Hydro-Oscillator
Scaling in wellbore may lead to sticking and thus reduced oil production.In order to solve this problem,based on the principle of generation of shearing cavitation by drowned jet,a cavitation jet hydro-oscilla-tor was designed,which was used together with a high-pressure rotating jet descaling device to improve the desca-ling efficiency of the wellbore.Then,the numerical simulation was used to optimize the internal structural parame-ters of the cavitation jet hydro-oscillator,obtaining the optimal structural parameters,oscillation frequency and amplitude.Moreover,field test was conducted to verify whether the specific parameters of the cavitation jet hydro-oscillator meet the requirements of wellbore descaling.Finally,orthogonal simulation was performed,obtaining the optimal parameters such as the distance from the jet nozzle to the throat L=13.52 mm,the throat length D=64.47 mm and the jet nozzle angle α=156.92°,by which the oscillation frequency is 9.92 Hz.Field test shows that the combined use of a cavitation jet hydro-oscillator and a rotary flusher increases the descaling speed by up to 16.2%compared to traditional hydro-oscillator and rotary flusher.This indicates that the cavitation jet hydro-oscillator has a significant improvement in the descaling efficiency of the descaling device.Moreover,the internal structure of the cavitation jet hydro-oscillator has no relative moving parts,making the oscillator operate stably and the maintenance cost of the device low.The conclusions provide technical guidance for the research and engineering application of hydro-oscillators.
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