Exploitation of natural gas hydrate using spin cavitation nozzle(SCN)is challenged by the prob-lems such as high energy consumption and low efficiency.To solve these problems,an oblique spiral type spin cavitation nozzle(OSSCN)was designed.Based on the computational fluid dynamics(CFD)method,the per-formances of OSSCN,SCN and contraction-dilatation cavitation nozzle(CDCN)were analyzed by simulation.The results show that compared with CDCN,OSSCN and SCN have a wider distribution of cavitation bubbles in the flow field,better cavitation performance and stronger entrainment capacity for hydrate fragments.Compared with SCN,OSSCN has a higher radial flow velocity and generates greater hydraulic impact energy at the hydrate wall,resulting in better erosion effect on the hydrate wall.The oblique spiral impeller structure of OSSCN greatly reduces the liq-uid resistance of the nozzle and the energy consumption.When the performance is not significantly different from SCN,OSSCN reduces energy consumption by about 39%compared to SCN,demonstrating an advantage of high efficiency and energy conservation.This innovative design provides technical support for the commercial application of cavitation jet drilling horizontal well+liner completion technology.
维普
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