Research On Motion Simulation And Reliability Of Fully Rotating Closed-loop Directed Drilling Tool

The full-rotation closed-loop directional steering drilling tool is a key execution component of the rotary steering drilling system.The rotary steering drilling realizes the control of the borehole trajectory by controlling the magnitude and direction of the steering force.During the guided drilling process,the drill string is in a rotating state,so a steering drill attitude mechanism is needed to achieve accurate control of the drilling direction.This paper studies and analyzes the motion characteristics of the full-rotation closed-loop directional steering drilling tool.According to the theory of space mechanism,the motion model of the full-rotation closed-loop pointing steering tool attitude mechanism was established.Matlab was used to simulate and analyze the movement laws of the system under different tool angles,different tool face angles and different working conditions.Three-dimensional simulation verifies the correctness of the model.The basic kinematic parameters such as the inner eccentric ring,outer eccentric ring,angular velocity and displacement of the drill bit were obtained,the movement characteristics of the attitude mechanism were revealed,the relationship between the rotation speed,the eccentricity and the trajectory of the drill bit was studied,and each The law of the parameters changing with time.In order to study the motion of the full-rotation closed-loop directional rotary steering drilling tool,a dynamic concentrated parameter model of the full-rotation closed-loop directional steering drilling tool was established,and the system dynamics analysis was carried out.The correctness of the model was verified by ADAMS simulation.The kinematic basic parameters such as the speed and posture of the eccentric ring and the guide shaft of the key components are theoretically obtained,the motion characteristics of the attitude mechanism are revealed,and the relationship between the speed and eccentricity of the eccentric ring and the guide shaft and the bit motion is clarified.The change rule of various parameters in the steering system with time lays a theoretical foundation for the research of the full-rotation closed-loop pointing steering drilling tool and the optimal design of the drilling system.In order to solve the cumulative error caused by the transmission accuracy of each part of the full-rotation closed-loop directional steering drilling tool to the actual drilling accuracy.In this paper,the reliability analysis of the motion accuracy of the full-rotation closed-loop pointing steering tool attitude mechanism is analyzed.Based on the ADAMS/View software virtual platform,a parametric virtual test prototype of the full-rotation closed-loop pointing steering tool attitude mechanism is established.Write a normal distribution pseudo-random number sub-function program to simulate various random error distributions of the mechanism,realize the Monte Carlo parameterization of the prototype,randomly establish a virtual prototype for simulation calculation,and obtain large sample test data and statistical tests of dynamic characteristics of drilling process At the same time,it is found that the motion reliability affects the drilling quality,so effectively controlling its transmission accuracy and various random errors has become the key to improving the design quality.