Flow Field Analysis of Hydraulic Guided Jet Nozzles for Flexible Drilling Tools
The existing flexible drilling technology and hydraulic jet radial drilling technology have difficulties or limitations in controlling the drilling directions.To achieve controllable drilling guidance,a high-pressure jet nozzle structure capable of hydraulic guidance was designed.A nu-merical model for guiding nozzle fluid was established using numerical simulation methods for flow field analysis.The study investigated the quantitative relationship between nozzle inclination angle,nozzle diameter,number of nozzle openings,and other parameters on guiding force and jet velocity.Additionally,a method for determining the direction of guiding force was provided.The results indicate that the nozzle guiding force gradually increases exponentially as the number of closed nozzles increases.Furthermore,the larger the axial inclination angle,the greater the noz-zle guiding force and maximum injection speed.When the inner diameter of the nozzle decreases,both the guiding force and injection speed increase significantly.Numerical simulation verified the feasibility of hydraulic guidance of jet nozzles.The fitting formula of the analysis results and guidance force is of great significance for the drilling guidance of hydraulic guidance nozzles.
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