Key Technology And Experiment Research Of Electro-hydraulic Composite Subsea Control Module

Subsea control module(SCM)is the core equipment of the subsea production system.It can be implemented to control the opening and closing of the valve actuator of the subsea oil production equipment as well as monitoring the operation status of the subsea production equipment.Among them,the electro-hydraulic composite subsea control module is the most widely used subsea control equipment,but China's research and design in this field is still in its infancy,and the related technology is not mature enough,so developing the key technology research of the electro-hydraulic composite subsea control module is of great significance for China to accelerate the domestic autonomy of SCM and improve the development capability of offshore oil and gas fields.According to the functional principle and design requirements of the electro-hydraulic composite subsea control module,the SCM overall scheme is carried out.In terms of mechanical system,the mechanical structure of the protective cover,pressure compensating device and docking locking mechanism is designed.In the hydraulic system,according to the schematic diagram of the hydraulic system scheme,the hydraulic-integrated valve plate is designed and the key hydraulic components are selected.In the aspect of electronic control system,according to its working principle and control requirements,the overall plan of the electronic control system is drawn up,and the circuit and software design are carried out.According to the working environment and control requirements of the electro-hydraulic composite subsea control module,the subsea electronic module of the integrated electronic control system is studied for heat dissipation.Carrying out the layout and selection of internal electronic components of the subsea electronic module,and determine the heat dissipation method;Taking into account the lack of power consumption parameters of the designed power supply module,the thermal loss calculation and thermal simulation analysis of the 24 V DC power supply module;Comprehensive consideration of the internal content that multiple heating electronic component as well as external high-pressure closed operating environment,analyzing the formation mechanism of the subsea electronic module thermal environment,determining its heat dissipation,and simulating the heat dissipation of the subsea electronic module during operation to verify its temperature rise meet system design requirements.The hydraulic oil circuit and the electro-hydraulic reversing valve are subjected to reliability analysis by using a second-order moment method.Determining hydraulic shock and fatigue wear are the main failure modes of hydraulic oil circuit and electro-hydraulic reversing valve respectively.The failure model of hydraulic shock failure model and electro-hydraulic reversing valve wear are established,and also the corresponding reliability function equation of state is established.Based their respective failure modes,the second-order moment method is used to calculate the reliability of the oil circuit and the electro-hydraulic reversing valve.It is verified that the hydraulic oil circuit and the electro-hydraulic reversing valve meet the reliability requirements,and the corresponding quantitative relationship diagram is drawn by Matlab mathematical modeling software is used to analyze the influence of the relevant basic random parameter changes on the reliability of the oil circuit and the electro-hydraulic reversing valve.According to the FAT test plan and standard of the subsea production system,the pressure test and temperature test of the prototype of the electro-hydraulic composite subsea control module developed were carried out.In the aspect of pressure test,static pressure test is carried out on the SCM prototype hydraulic system,and the whole prototype is subjected to pressure test to ensure that the functionality of the SCM prototype under pressure is not affected;in the temperature test,the control system of the prototype that subsea electronic modules are tested in high temperature,low temperature and high temperature cycling environments to ensure that the functionality of the subsea electronic modules is not compromised in harsh temperature environments.