Research On Flow Field Characteristics Of Cage Type Throttle Valve And Development Of Virtual Operation Training System For Deepwater Christmas Tree

Deepwater Christmas tree cage choke valve is one of the key devices for deepwater oil and gas exploitation.Cage choke valves are often used on site to regulate pressure and production.The performance of cage choke valves directly affects production safety,efficiency and cost.Because the deepwater Christmas tree cage choke valve operates in the deepwater environment for a long time,the on-site control training has to be carried out on the offshore platform,which is not only limited by the environment,site,working conditions and so on,but also has high training costs and potential safety hazards.Using virtual reality technology,combined with actual production data,it is not only possible to simulate emergencies that are difficult to reproduce in practice or have high risks and cannot be reproduced,overcome time and space constraints,but also allow trainees to operate repeatedly in the virtual environment,in order to improve the trainees' emergency response ability and emergency handling ability.Therefore,it is particularly important to study the flow field characteristics of the deepwater Christmas tree cage type throttle valve and carry out visual simulation on it in combination with the actual production data.The deepwater operating conditions of the cage type throttle valve are complex.The design requirements,design methods and performance requirements are very different from those of ordinary valves.In this paper,the type,structure and throttling principle of the deepwater Christmas tree cage type throttle valve are analyzed and studied.The related theories of fluid mechanics and fluid dynamics are comprehensively applied to analyze the relationship among the valve opening and flow coefficient,flow rate,and throttling pressure difference.Based on the deepwater Christmas tree of a gas field in the South China Sea,a three-dimensional model of the cage type throttle valve is established,the fluid domain model inside the throttle valve is studied and described,and the mathematical model of the internal flow field of the valve body is established;Meshing is used to carry out unstructured meshing,based on computational fluid dynamics control equations,the Reynolds time-averaged viscosity coefficient method is used in Fluent software,and the RNG k-? model is selected to study the influence law of different sizes,different distributions,and different shapes of orifices on the throttle valve for the characteristics of the throttle valve flow field,and provides a basis for valve parameter design.The simulation of the valve under different working conditions and different valve stem strokes is carried out,and the pressure,velocity and energy fields are analyzed,and it also provides data support for visual simulation of cage choke valve.Using the research method combining 3ds Max software and Unity 3D engine,3D modeling,skeletal animation,fluid simulation,etc.of the cage throttle valve are used to complete visual simulation.And the use of Force Control software to develop a two-dimensional deepwater Christmas tree operation training system.