| Subsea tree is one of the core equipment of subsea production system and an indispensable part of subsea oil and gas production.At present,the all-electric X'tree developed and manufactured by Cameron has been tested under the sea,and its superior performance and development potential are incomparable to traditional hydraulic X'tree.The electric control gate valve is the key execution structure of cutting off the flow in the electric tree,its performance is directly relate to the safety and reliability of the underwater production.Therefore,it is of great theoretical significance and engineering application value to study the subsea electric X'tree gate valve systemThrough in-depth analyze the international design standards of underwater production equipment,the working conditions and action requirements of the electric control gate valve of the underwater All-electric X'tree was determined.Independent research and design schemes were adopted for the dynamic side and the hydraulic side respectively.The design and material selection of important parts for the main valve of all-electric X'tree at 1500-m water depth and10000-psi pressure was completed.A new mechanical connection structure called clamping block was proposed,and the comparison between the clamping block structure and traditional connection mechanism was accomplished with the help of ANSYS Workbench.The result verified that the clamping block structure could effectively reinforce the valve joint and significantly reduce the size of the whole equipment.According to the international electrical equipment design standards,the actuator action requirements and size requirements were determined.According to the force analysis of the hydraulic end,the motor selection,deceleration ratio design and motion conversion scheme of the power end were completed.In order to adapt to the valve working condition,the screw compression spring was chosen as the energy storage body of the failure-closing scheme,and the pressure balance structure was designed to ensure the reliability of the valve failure-closing scheme.Based on COMSOL Multiphisics and the numerical analysis method of fluid-solid coupling,the working details of the gate valve in the high-pressure flow passage are simulated.By analyzing the results of simulation experiment,the results showed that the wedge is better than the other two kinds of rams under this working condition,and relevant theoretical explanations were made according to the flow theory of holes and gaps.Nine sets of orthogonal experiments were designed from the perspective of parameter sensitivity analysis.According to the experimental results,the influence of three angles on the gate valve performance was analyzed,and the relevant parameters were optimized.A set of gate valve actuator was built,which could fully achieve the action requirements.Including the open locking,closing and failure-closing actions of electric control valve.The prototype verified the rationality of the design of the gate valve actuator.At the same time,based on STM32 MCU and Qt programming language,the corresponding measurement and control system was developed,the lower computer and upper computer system development are completed,the realization of the corresponding motion control and data acquisition were acheived.A filtering method based on Kalman Filtering algorithm was proposed,by combining with the Simulink model of signal acquisition,the digital filtering of monitoring signals is realized in the upper computer software. |
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