Research On Physical Simulation For Hydraulic Control Systems In Offshore Deep-water Subsea Oil Production Facilities

The hydraulic control systems in offshore deep-water subsea oil production facilities is mainly used to control the valves of subsea X-trees, to achieve crude oil and chemical substances injuction by opening and closing the valves. In this paper, according to the models of deep-water oil and gas development and the requirements of the conditions, combining with the relevant industry standards, researched the physical simulation for the hydraulic control systems in offshore deep-water subsea oil production facilities in the depth of 300-1500 metres. This thesis has studied the impact of the long umbilical on the performance of the hydraulic control systems and the theoretical methods for physical simulation, built the mathematical models of the long umbilical, derived and analyzed theoretically the formulas of fluid resisitance, fluid capacitance and liquid inductance for the long umbilical. On this basis, this thesis studied the theory of the equivalence of the long umbilical general characteristics. Taking an oil field in the South China Sea as an example, completed the dynamic simulations of hydraulic control systems under common conditions and the pipe systems for the equivalence of the long umbilical by AMESim. According to the total experiment program, built the physical simulation platform for the subsea facilities hydraulic control systems.The thesis included six chapters.Chapter I introduced the situation, the development and the kinds of the hydraulic control systems in offshore deep-water subsea oil production facilities, described the research purpose, significance and main research contents of physical simulation for the hydraulic control system.Chapter Ⅱ introduced the working principle and technical features of the hydraulic control systems, studied the problems of mutual interference while several actuators were driven by only one long umbilical, the long umbilical’s impacts to the actuators’ response, the long umbilical’s compensation effect to the hydraulic control systems. Focused on the mathematical models of the long umbilical, derived the formulas of fluid resisitance, fluid capacitance and liquid inductance for the long umbilical.Chapter Ⅲ introduced the method of physical simulation for subsea hydraulic components, focused on the theory of the equivalence of the long umbilical general characteristics, determined the schematic diagram of physical simulation system.Chapter IV took 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 dynamic simulations of hydraulic control systems under common conditions and the pipe systems for the equivalence of the long umbilical, analyzed the simulation results.Chapter V introduced the total experiment program, completed the selections and manufactures of the components, built the physical simulation platform for the subsea facilities hydraulic control systems.In the final Chapter VI, the general summarization of the total research achievents was given and the further research direction was brought forward.