Research On Structure Design And Simulation Of Bidirectional Impactor

Due to the rapid development of the world economy,the demand for oil resources in each country is increasing,and the shallow oil and gas resources with rich resources are gradually scarce.Therefore,oil and gas exploration and development is bound to develop towards a more complex deep direction.Deep heterogeneity is serious,rock hardness is high,wear resistance is strong,drillability is poor.When PDC bit is used to drill in this formation,the wear is fast,the footage is difficult,and the service life is very low,which hinders the exploitation and utilization of oil and gas resources in deep hard formation.It has become a world consensus to study drilling tools suitable for deep hard formation.With the increase of well depth,under the action of formation confining pressure,the hardness and strength of rock will increase significantly,resulting in a series of problems,such as low rock breaking efficiency,low service life,large decline in drilling speed and so on.In order to solve this problem,this paper designs a rotary percussion drilling tool based on screw motor on the basis of previous studies and combined with the actual needs of engineering,and carries out the simulation research.In this paper,the structure and principle of the existing impact devices of the size series of ? 172 mm are studied and analyzed.Combined with the actual working condition of drilling engineering,a compound impact mechanical structure of axial impact and circumferential impact is designed.The overall scheme design,strength analysis and Simulation of main parts of the rotary percussion screw drill are carried out.The overall scheme design mainly includes the structural design of impact mechanism,driving mechanism and supporting structure.The specific structure includes bypass valve assembly,anti drop assembly,screw motor assembly,cardan shaft assembly and intermediate support sub joint.The relevant dimensions of the main parts are determined,and the assembly drawing is completed.According to the assembly drawing of rotary percussion screw drill,the 3D model of rotary percussion screw drill is established by using Solid Works 3D modeling software,and the assembly task of 3D geometric model is completed.With the help of ANSYS software and strength theory knowledge,the finite element strength analysis of the cam mechanism,output shaft and driving mechanism of the impact system is carried out.Based on the working environment and ADAMS simulation software,a simplified model of three-dimensional geometric model of rotary drilling tool is established and imported into Adams for dynamic simulation analysis.The contact forces of upper and lower cams with different WOB are compared and analyzed.The impact frequency,impact force and related theoretical calculation results,impact force of upper and lower cam structure and displacement of upper shaft body are compared and analyzed.Design and optimize the cam motion curve.The effects of different rotating speed,disc spring stiffness and inclination angle on the axial and circumferential impact force are analyzed.To sum up,according to the structure and working principle of rotary impact screw drill,the structure design and mechanical analysis are carried out.The correctness of relevant theoretical calculation and model is verified by ADAMS simulation software.It provides a certain reference for the future research and development of oil exploitation tools.