| During the drilling process of small hole horizontal wells,there are common problems such as low mechanical drilling efficiency and severe support pressure.This article aims to reduce friction and drag during drilling operations,improve speed and efficiency,and research and design a suitable Φ A new small-sized turbine hydraulic oscillation drag reducer for 118mm slim hole sidetracking drilling was developed,and the structural design,tool performance analysis,and optimization design of the small-sized turbine hydraulic oscillator were completed using software and methods such as 3D modeling,finite element analysis,CFD analysis,and optimization design.The main research content of the paper is as follows:(1)Complete research on the working principle and theoretical basis of hydraulic oscillators.Starting from the working principle of hydraulic oscillators,the unit node method was used to construct an axial vibration model of hydraulic oscillators.Theoretical research was completed on the vibration model of hydraulic oscillators,pipeline pressure loss,water hammer pressure model,etc.,providing a theoretical basis for the subsequent design and analysis of small-sized turbine hydraulic oscillators.(2)Complete the overall plan and structural design of a small-sized turbine hydraulic oscillator.Based on the working characteristics of hydraulic oscillators,a comprehensive analysis of the advantages and disadvantages of various hydraulic oscillators is conducted.Combined with the actual application conditions of the tool,the main technical parameters of small-sized turbine hydraulic oscillators are determined,and the overall plan and structural design of the tool are completed.Elaborate on its structural composition and working process,complete the structural design of the tool valve system,power system,oscillation system,and other components,and verify the mechanical properties of cylinder liners,transmission spindles,and other components.The calculation results show that the structural design of the designed turbine hydraulic oscillator is reasonable,the working performance is reliable,and meets the expected design requirements.(3)By using 3D modeling,kinematics analysis,finite element analysis,fluid mechanics analysis and other software and methods,the static and dynamic characteristics of the small turbine hydraulic oscillator,including the movement characteristics of the port valve system,the hydraulic characteristics of the power system,and the sealing performance,were analyzed.Studied the impact of changes in key design parameters of hydraulic oscillators on the static and dynamic characteristics of tools,providing qualitative and quantitative laws and data support for the optimization of tool functional components and overall performance.(4)With the goal of improving the performance of small-scale turbine hydraulic oscillators,a multidisciplinary design optimization method was adopted to optimize the performance of tool flow valves(water hammer pressure,valve disc group pressure drop),power system performance(transmission turbine torque,power system pressure drop),and sealing performance(contact stress,PTFE shell wear).After optimization,the overall performance of the tool was significantly improved,with the impact force generated by the tool increasing from 8.50kN to 99.86kN,and the overall pressure drop decreasing from 3.85MPa to 2.53MPa.The optimization method and tool optimal parameter combination adopted in the paper can provide theoretical basis and reference for the application and development of downhole vibration tools in slim hole horizontal wells. |
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