Analysis And Simulation Study On The Transmission System Of Well Logging Unblocked Device

Well logging plays an important role in oil drilling and can provide effective data support for oilfield development.In recent years,due to the increase of drilling speed,the down hole conditions are increasingly complex,logging construction lurks growing difficulty,and the number of down hole encounters with obstacles and stuck faults have multiplied.Aiming at the problem of logging obstruction caused by irregular borehole,this paper develops a well logging unblocked device.When the instrument is in trouble,under the control of the unimpeded device,the drill bit will automatically correct the deviation of the well and dredge the well passage,so that the logging instrument can be smoothly lowered into the well.The structural design of the unimpeded device is carried out,and its transmission system is studied.According to the actual research situation,the technical requirements of the logging passer are analyzed,and the overall mechanical structure of the smoothing device is determined.The planetary transmission mechanism is analyzed and designed,and a reasonable configuration scheme is selected to determine the main structural parameters of the planetary gear train.The digital model of the logging passer is preliminarily established,and the assembly interference analysis is carried out.It is found that there is no interference between the mechanisms to ensure the correctness of the model assembly.The force analysis of the wheel train is completed.The low-speed gear meshing pair is taken as an example to solve the force situation.The tooth surface and root strength requirements of the low-speed gear train are checked,and the theoretical mechanics analysis of the main component planet carrier is completed.Obtain the force condition and the maximum equivalent stress.According to the empirical formula,the main factors affecting the magnitude of the load resistance are listed.The magnitude of the load resistance under the distribution of the two factors is analyzed.The load coarse is given by working condition.The finite element mechanical simulation model is established by using ABAQUS.The dynamic contact analysis of the meshing mechanism of the planetary gear transmission mechanism is completed by quasi-static analysis method and display dynamic analysis method respectively.The tooth surface contact stress and root stress of each meshing gear are obtained The analysis results are compared with the theoretical calculations,which show that the strength of each gear meets the functional requirements;the finite element simulation analysis of the planet carrier strength,combined with the theoretical value to check the planet carrier strength,to verify the mechanical rationality of the transmission mechanism design,for structural improvement And performance optimization provides important theoretical basis and data reference.Establish a virtual prototype model of the three-stage transmission mechanism of the logging passer,add reasonable motion pair and drive from the specific working conditions,and set reasonable gear meshing contact parameters,then perform dynamic simulation analysis on the model to obtain output speed of each stage.And the torque simulation results,taking the low-speed sun gear and the planetary gear meshing pair as an example to analyze the gear meshing force,the simulation analysis results are compared with the theoretical analysis values to ensure the reliability of the transmission.The variation of the meshing force under different loads is studied,and the loading problem of the mechanism is provided for reference.Finally,the physical prototype is made in combination based on theoretical design and simulation analysis.