The Design Of Electro-hydraulic Multiplexed Subsea Distribution Unit In Offshore Oil And Gas Field

Subsea production control system is the key equipment to ensure that the subsea oil and gas fields would be explored correctly and safely. A few of developed foreign countries have monopolized the field of subsea production control system, but the accumulation of our country in this field is relatively small. With the increasing demand of oil and gas consumption and of the protection and exploitation of ocean oil in China, the domestic Marine engineering equipment company is in urgent need to research and develop the electro-hydraulic multiplexed subsea production control system to support our countries oil and gas drilling and production engineering to the deep sea. Electro-hydraulic multiplexed subsea distribution unit is the hub of the connection between the offshore equipment and the other underwater control equipment, which is the indispensable link in the construction of subsea production control system. This paper completed the relevant design of the subsea distribution unit, by doing the research of function and structure of its hydraulic distribution module and electrical distribution module.This paper firstly introduced the research background of the subsea distribution unit and development history of the development control system. The common structure forms of the subsea distribution unit were gathered and analyzed in this paper. According to the working conditions and performance requirements, this paper designed the function and structure schemes of the electro-hydraulic multiplexed subsea distribution unit, and introduced its main components. Secondly the paper determined the overall design scheme of the electro-hydraulic multiplexed subsea distribution unit and the layout of its main modules(HDU and EDU).In the hydraulic distribution module part, this paper completed the design of its internal fluid distribution pipeline, control panel and internal piping layout. Using FLUENT software analyzed the flows of low pressure hydraulic oil in the pipeline and the uniformity of the output flow of each branch pipe. According to the simulation results, determined the pipeline structure design scheme. This paper completed the operation panel design, according to the internal pipeline structure design and the operation window size of isolation valve and MQC. Using SOLIDWORKS software, this paper designed the 3d pipelines to complete the layout scheme of the internal pipelines of HDU.In electrical distribution module, this paper completed the design of cable branch structure, optical fiber branch structure based on optical fiber branching structure and electrical pressure chamber structure of electrical distribution module. Using the OPTISYSTEM software downlink control signal communication model based on optical power splitter was established. This paper used the quality of the control signal received by the subsea control module to verify the electrical distribution module based on the optical splitter can satisfy the requirement of function. Based on the mathematical model of the critical pressure, this paper designed wall thickness of the pressure shell and flat head of EDM. Using ANSYS Workbench software, the finite element static analysis was done to verify the reliability of structure design and ensure long-term stable operation of EDM.