Design of Adaptive Control System for Weight on Bit of Vehicle-Mounted Drilling Rig

Abstract

Aiming at the problems of insufficient perception and adaptability of vehicle-mounted drilling rig control system to complex formation and unsatisfactory drilling efficiency, an adaptive drilling weight on bit (WOB) control system of the vehicle-mounted drilling rig is designed in this article. Based on the real-time monitoring of drilling parameters obtained by various sensors, the lithology of drilling formation is identified by particle swarm optimization-support vector machine (PSO-SVM), the corresponding high-efficiency WOB is matched according to the differences in rock properties of different formations, and the valve port size of electrohydraulic proportional overflow valve is controlled by fuzzy proportional-integral-derivative (PID) to adjust the feed force of the feed cylinder so that the WOB of the drilling rig can change adaptively with the formation, and the rock- breaking efficiency of the drilling rig can be improved. Through the joint simulation and comparative analysis of Simulink and AMESim, the designed fuzzy PID controller has a small overshoot and high control precision. The experimental results of preset rock samples show that the WOB adaptive control system can effectively adjust the WOB to adapt to the changes of formation lithology, effectively improving the drilling speed and drilling efficiency.