| Installation Workover Control System(IWOCS)is an important wellhead control system for subsea oil and gas wells during installation and completion and workover,and its role is to provide electro-hydraulic control and remote monitoring for completion and workover of Christmas tree,tubing hanger and other equipment.At present,Installation Workover Control System has been monopolized by foreign countries for a long time,and there are no mature products in China.With the development of China’s offshore oil and gas resources development to the deep water field,it is of great practical significance to master the technology related to subsea production system and realize the localization of key equipment.In this paper,based on the university-enterprise cooperation project,the hydraulic power system,which is the core component of the installation of the well repair control system,was developed and designed independently,the key issues were studied,the design was optimized and improved,and finally the designed IWOCS hydraulic power system was verified through hydraulic simulation.The basic parameters of the IWOCS hydraulic power system were set according to the design requirements,and the hydraulic schematic diagram of the hydraulic power system was drawn.The main hydraulic components of the hydraulic power system were calculated and selected,and the overall design of the IWOCS hydraulic power system was developed.The three-dimensional structure of the IWOCS hydraulic power system was designed according to the actual dimensions,and the space layout and piping alignment of each module inside the system were designed in detail.The overall three-dimensional diagram of the hydraulic power system was drawn.The vibration problem in hydraulic system piping is studied,and the simulation analysis of fluid-solid coupling vibration of hydraulic piping is carried out based on ANSYS Workbench and Fluent,and the optimized design scheme of hydraulic piping vibration reduction is proposed.Based on AMESim,the impact oscillation characteristics of hydraulic pipeline are studied,and the effects of valve closing speed and pipe diameter on hydraulic impact are analyzed,and the optimized design scheme to mitigate the impact is proposed.The reliability study of the system with multi-state failures was carried out for the design scheme of IWOCS hydraulic power system.The failure modes of each hydraulic component in the system were analyzed,and the T-S multi-state fault tree of the hydraulic power system was established and transformed into a Bayesian network model.The Bayesian network was analyzed and calculated by NETICA,and the reliability and component importance of the system were derived,and the influence law of each failure mode on the system reliability was studied.Based on AMESim,the hydraulic simulation of the designed IWOCS hydraulic power system was carried out,and the simulation model of IWOCS hydraulic power system was constructed,and the process simulation of the possible situations during the actual operation was carried out to verify the feasibility of the designed IWOCS hydraulic power system. |
