Pulse cavitation multiple jet nozzle

Abstract

The invention relates to a pulse cavitation multiple jet nozzle, which comprises a nozzle body which is formed into an open end on one end and a jet end with a hollow cylinder on the other end, the open end is used for connecting with a fluid pipe, and the jet end is provided with a plurality of jet orifices; the central position of the jet end is provided with a central jet orifice, and a plurality of lateral jet orifices are arranged around the central jet orifice; the nozzle body is internally provided with an impeller being capable of rotating, a part of the fluid flowing into the nozzle passes through the center of the impeller and the central jet orifice to form continuous straight jet, the other part of the fluid impacts the blades of the impeller to cause the impeller to rotate so as to make flow field on the inlets of the lateral jet orifices around the central jet orifice generate regular disturbance, thus a pulse jet can be formed, vacuole can be produced, a cavitation jet can be formed, and the cavitation jet and the pulse jet are coupled to form a pulse cavitation jet to be ejected from the lateral jet orifices. The invention is simple in structure, and can greatly improve the efficiency of drilling.

Description

technical field [0001] The invention relates to a nozzle, in particular to a pulse cavitation multi-hole jet nozzle capable of forming a pulse jet coupled with a cavitation jet. The nozzle of the present invention is particularly suitable for breaking rocks. Background technique [0002] In our production and life, it is necessary to drill holes in the formation in many cases. For example, laying optical fiber cables, transportation pipelines and drilling ventilation channels in coal mines and oil and gas drainage channels in oil wells or gas wells. The method of using high-pressure water jets to drill laterally in the reservoir of oil wells to increase the area of ​​oil and gas drainage has been widely used and studied. At present, the commonly used jet forms mainly include continuous straight jet, pulse jet, rotating jet and cavitation jet. [0003] The continuous direct jet flow breaks the rock in the way of impact damage, that is, when the impact force of the jet flow...

AI Technical Summary

Problems solved by technology

[0008] Multi-hole nozzle, that is, change the single-hole nozzle into a multi-hole nozzle, and increase the erosion area through the multiple jets generated by it, but the rock breaking method of this method is impact crushing, so the efficiency of jet energy utilization is low

[0009] Rotating jet nozzle, the rotating jet ejected by it can reduce the rock-breaking threshold pressure to form larger diameter holes, but its rock-breaking depth is small, and it will form a conical protrusion at the bottom of the rock, which will affect the rock-breaking effect

[0010] Direct swirling mixed jet (rotating double jet) nozzle, the rotating double jet ejected by it can form a larger hole diameter and depth, but under the condition of confining pressure, the energy of the direct swirling mixed jet decays rapidly, and the rock breaking effect is poor ; At the same time, due to the complex internal structure of the nozzle, the pressure loss is relatively large

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