Physical Simulation Research In Pressurized Cabin For Electro-hydraulic Valve-control System Of X-tree Of Subsea Production System In Deepsea

The X-tree valve-control hydraulic system is mainly used to control the valves of subsea X-trees in offshore oil field production, to achieve crude oil and chemical substances injuction by opening and closing the valves. According to the models of deepwater oil and gas development and the requirements of the conditions, combining with the relevant industry standards, this paper introduces X-tree valve-control hydraulic system in the depth of 300-1500 metres. This thesis has studied the principle of this hydraulic system, the processing method of the long umbilical in hydraulic system and the theoretical methods for hardware simulation with pressurized canbin.On this basis, Taking an oil field in the South China Sea as an example, we has completed the platform of valve control hydraulic system. At last, it compares the results between the AMESim model and simulation platform.The thesis included six chapters.Chapter I has introduced the situation, the development and the kinds of the X-tree valve-control hydraulic system, described the research significance and main research contents.Chapter Ⅱ has introduced the working principle and technical features of the hydraulic control system, the long umbilical’s impacts to the actuators’ response based on ISO 13628-6 and relevant experience of engeerings.Chapter Ⅲ has introduced the method of how to design the two key components such as a new kind of electro-hydraulic direction valve and subsea actuator. Conducted an experiment of the direction valve and based on the results rebuilt a new valve.Chapter IV has reseached the hardware simulation methods for subsea hydraulic system, including the theory of the equivalence of the long umbilical general characteristics, the HPU which is fit for pressurized cabin test and the SEM monitoring system.Chapter V takes an oil field in the South China Sea as an example, using the present research results, built the hydraulic control system and its main components’ models by AMESim, completed the simulations of hydraulic control system under common conditions and compared the results between the the AMESim model and physical model.In the final Chapter VI, the general summarization of the total research achievements were given and the further research direction was brought forward.