Structural Reliability Analysis of Microsphere Focused Logging Tool Based on Response Surface Method

Abstract

The push-pull system of microsphere focused logging tool is an important moving mechanism of this type of logging tool. The push-pull system will periodically bear large loads under working conditions and is prone to stress concentration. The structural strength reliability of the push-pull system is related to the logging accuracy and even the success or failure of the logging task. Based on ANSYS workbench software, this paper first conducts modeling and static simulation on the push-pull system of microsphere focused logging tool under working conditions, then conducts sensitivity analysis and experimental design on the basis of this analysis, and then conducts response surface analysis on the key stressed components of the push-pull system according to the analysis results. Finally, six sigma module is used to analyze the reliability of the push-pull system, and the structural strength reliability of the push-pull system is given by the probability distribution table obtained from the analysis. The analysis results show that the maximum equivalent stress occurs on the link arm of the push-pull system under working condition. The strength reliability of the link arm of the push-pull system under current working condition is high, and it can meet the daily logging requirements. However, there is still room for further design optimization.