Design And Performance Research Of (?)2-3/8 Coiled Tubing BOP Control System

BOP is a key well control device to prevent blowout during drilling operations Currently,most of the BOP control systems used in the actual situation have low automation,cumbersome operation,and low reliability.The advantages of its ability to work under pressure,small damage to the formation,and small space occupation are more and more widely used in oil and gas mining projects,but there are not many related studies on the BOP control system for coiled tubing.Therefore,this paper has carried out related research on the coiled tubing BOP control systemIn this paper,annulus pressure measurement while drilling and mud pool liquid level detection technology are used to monitor whether overflow and blowout occur in real time.The hydraulic system is designed according to the requirements of the blowout preventer.Use STM32 as the controller,the TCP/IP communication protocol is adopted to complete the circuit and program design in the electronic control system.In order to prevent the system from being paralyzed due to controller failure,the control system uses a dual-redundancy hot backup structure.When the master controller fails,the slave controller can replace the master controller.Among them,the master-slave controller uses an analytical fault detection algorithm to achieve fault detection and improve the reliability of the control systemBecause mechanical damage is an important factor affecting the life of the coiled tubing,and the wall thickness of the coiled tubing is relatively thin,in order to prevent the semi-sealed gate and suspension gate in the four-ram blowout preventer from adversely affecting the coiled tubing,the The fuzzy PID control algorithm is added to the pressure regulation of the electromagnetic pressure reducing valve to improve the pressure control accuracy and make the output pressure quickly reach the steady state output.The MATLAB-Simulink is used to simulate and analyze the mathematical model of electromagnetic pressure reducing valve based on fuzzy PID controller and traditional PID controller.Simulation results indicate:The electromagnetic pressure reducing valve with fuzzy PID controller has no overshoot and "flat top" phenomenon,and has faster response speed and stronger anti-interferenceUsing AMESim to model and analyze the main components of the hydraulic system and the overall system.According to the open-loop hydraulic system simulation curve analysis:it can be obtained that the hydraulic system has a good response performance and can complete the corresponding movement of the gate within the time specified by the API,but the output pressure fluctuates The range is larger.Through the AMESim-Simulink joint simulation,a fuzzy PID controller is added to the open-loop hydraulic system to form a closed-loop hydraulic system.According to the simulation curve,it can be known that the fluctuation range of the output pressure output of the electromagnetic pressure reducing valve is obviously reduced,and the time required for the gate to fully close is shorter,which improves the pressure steady-state output performance and fast response performance of the hydraulic system.