Traditional offshore workover usually requires the use of risers to complete workover operations. This method has certain limitations in the process of operation, high layout and maintenance costs, and poor adaptability to the marine environment. Marine riserless light well intervention operations reduce the cost and risk of workover operations by eliminating the use of conventional risers. However, this method still faces challenges in terms of operational complexity and technical training. Virtual reality technology provides an innovative solution that enables operators to simulate the real environment and equipment in a virtual environment to perform workover operations in real time, understand the operation process and equipment operation in advance, and then improve the safety and efficiency of workover operations. Therefore, based on virtual reality technology and safety oriented, this paper designs an innovative workover virtual reality system for marine riserless light well intervention operation, realizes the dynamic simulation of workover equipment, and provides a new training and operation support method for operators. Firstly, the system composition, equipment layout and movement law of marine riser workover equipment are analyzed in detail. Based on the analysis results, the virtual model of the workover equipment was successfully constructed and refined by SolidWorks and 3D MAX software. The virtual model can approximately characterize the appearance and structure of the workover equipment, including each component and connection mode. Secondly, using Unity 3D virtual engine tool, with the help of its built-in script programming language, the functions of offshore workover equipment information query, dynamic interaction, operation process simulation and virtual and real interaction control were realized. The operator can interact directly with the workover equipment in a virtual environment through a first-person perspective and a VR walkthrough perspective. The use of virtual reality enables operators to conduct training and process optimization in advance, thereby improving safety and efficiency of workover operations. Then, in order to realize the real-time monitoring and data management of workover equipment, the real-time data of sensors were collected based on the OPC UA protocol, and the MySQL database was used to manage the workover equipment information uniformly. Through this method, the parameters and status information of workover equipment can be obtained in real time, and the data analysis and fault diagnosis can be carried out, so as to improve the reliability and maintainability of workover operations. Finally, through the application analysis of actual cases, the advantages and application value of the marine riserless light well intervention system based on virtual reality are verified. Compared with the traditional operation mode, the system can significantly improve the operation efficiency and safety, reduce the operation risk, and reduce the probability of equipment damage and accidents.
