Key Technology Research On Mechanical-electrical-hydraulic Integrated System Optimization Of Truck-mounted Drilling Rig

Truck-mounted drilling rig is a special drilling equipment with mechanical-electrical-hydraulic integration,which is composed of mechanical,hydraulic and electronical subsystems through crossing and merging.The coupling relationship of interaction and mutual influence among each subsystem determines the comprehensive performance of the integrated system.As construction requirements and drilling condition complexity of shallow oil&gas extraction well,geothermal well and emergency rescue well increase,mechanical-electrical-hydraulic integrated system inadequacy of truck-mounted drilling rig in the reliability of structural mechanics,stability of hydraulic fluid driving and fine control performance of electrical control algorithm has been exposed more and more,which restricts the industrial development of truck-mounted drilling rig seriously.Present research on mechanical-electrical-hydraulic integrated system of truck-mounted drilling rig is mainly based on numerical simulation of mechanical and hydraulic systems,and functional design of electronical control systems.However,systematic research on the comprehensive mechanical-electrical-hydraulic performance is relatively lacking,resulting in uneven and localized stress distribution,overweight of mechanical structures,insufficient stability of hydraulic system and low automation level of electronic control system.In order to solve the above problems,the integrated design and analysis of mechanical-electrical-hydraulic system of truck-mounted drilling rig has been carried out,and the key technologies are researched to improved the mechanical strength,buckling stability and lightweight characteristics of the mechanical system;to improve the stabilized response and dynamic matching characteristics of the hydraulic system;to improve the accuracy,robustness of control algorithm of electronic control system,which is to realize the improvement and optimization of the comprehensive performance of the mechanical-electrical-hydraulic system.The innovative research results obtained are as follows:(1)Working conditions of mechanical structure are analyzed and the stepped reduction method,Newton-Raphson iterative algorithm,strength theory and other mathematical analysis methods are combined with numerical analysis methods such as sensitivity analysis,response surface method,MATLAB-Python-ABAQUS co-simulation,and topology optimization to optimize the mechanical structure of truck-mounted drilling rig based on the multi-parameter combination response design method,and the mechanical structure is lightened on the premise of ensuring structural stability.(2)The method of combining theoretical calculation and AMESim simulation was used to analyze the frequency domain and time domain stability characteristics of the hydraulic power system under different drilling conditions,and the influence rules of spring stiffness and damping on the load sensitivity and balance valve control system are obtained,then the spring stiffness and damping hole diameter are optimized;a design method for hydraulic system with damping half-bridge to suppress chattering is proposed to solve the problem of large fluctuations in hydraulic systems with large inertia;the vibration frequency response of the hydraulic pipeline and the dynamic characteristics of the distributed parameters are studied,then the pipelines are optimized and designed through virtual prototype,finally the stability and dynamic response characteristics of the hydraulic power system are improved.(3)In order to meet the requirements of efficient drilling for automatic drilling electro-hydraulic control algorithm,the theoretical modeling,AMESim and Simulink co-simulation methods are used to analyze the adaptability of different algorithms of traditional PID,fuzzy PID and feedback linearization sliding mode variable structure control to the position tracking control of the valve-controlled asymmetric hydraulic cylinder of the feed hydraulic system,which solves the problems of non-linearity and low control accuracy of the electro-hydraulic control system and improves the control accuracy,stability and response speed of the electro-hydraulic control system during automatic drilling process.(4)The effectiveness and accuracy of mechanical-electrical-hydraulic system performance optimization of truck-mounted drilling rig was verified through simulation and test by means of the 3D co-simulation,type test,mechanical performance test and field engineering test measurement,which has achieved the unification of theoretical analysis,numerical simulation and experimental verification.The comprehensive performance improvement of the stability and reliability of mechanical-electrical-hydraulic integrated system of truck-mounted drilling rig is achieved by the research,whose results can provide theoretical and technical support for the design,optimization and automation of the truck-mounted drilling rig as well as possess great theoretical significance and engineering application value for improving drilling construction reliability,efficiency and safety.