Design Of Heave Compensation System For Deepwater Drilling Based On Electro-hydraulic Proportional Technology

Floating drilling platform is the main equipment for deepwater drilling,but drilling platform will be up and down under the action of wave and cause the movement of drill pipe on the derrick and hook periodicity,the drilling pressure will be changed,the drilling work will be seriously affected,so the heave compensation of floating drilling platform must be designed.The electro-hydraulic proportional system controlled by computer has high reliability,high control precision,fast response speed and it is an ideal control method.The domestic independent property series of deepwater drilling ship called TIGER are researched.Then Electro-hydraulic proportional technology of deepwater drilling heave compensation system is designed.Theoretical research,computer simulation and experiment research methods are used.This paper first introduces the heave compensation technology and electro-hydraulic proportional technology,classification and research status.From theoretical analysis,the heave movement regularity of drilling rig is studied.The quality of the drill string,the displacement of hook and the load are calculated.The heave compensation system based on electro-hydraulic proportional technology is designed.They are installed between the traveling block and hook,including the active compensation system,tandem semi-active compensation system,parallel semi-active compensation system.Then this paper introduces the working principle and calculate the corresponding parameters.The active and semi-active system simulation model are setted up by AMESim simulation software.PID algorithm is used.Simulation show that the designed system meets the demand of compensation,the semi-active compensation system has lower energy consumption than the active compensation system.Considering the actual working condition of complex,the simulation model of fuzzy PID intelligent algorithm control is setted.This result also meets the requirement of compensation.According to the principle of similarity calculation experimental parameters,active simulation test bench is designed,including the mechanical system and control system.Then 3d model is drawed,physical model is setted,and also the main components and the signal connection are introduced,the control software interface in c # is mapped.The experimental platform is used to do experimental research.The realization of the function of test bench is introduced.The flow charts of the movement are drawed.The dead-zone of the electrohydraulic proportional directional valve is compensated.The proposed PID algorithm and fuzzy PID algorithm are used to do experimental research,the experimental results show that the compensation is good and meet the requirements of the compensation.