| Subsea control module(SCM)plays an important role in the whole underwater production system.It is responsible for monitoring and controlling the working state of underwater valve actuators and other equipment.At present,the exploitation of offshore oil and gas mainly adopts electro-hydraulic composite underwater control module.However,the technology of electro-hydraulic composite underwater control module has been monopolized by oil equipment companies such as the United States and Norway for a long time,which leads to the high cost,long cycle and difficult maintenance in China’s offshore oil and gas fields.The development of electro-hydraulic composite underwater control module to realize SCM localization is of great significance for China’s offshore oil and gas exploitation.In this paper,according to the seabed environment of Bohai oil and gas field and the need of tree control,the overall scheme of the underwater control module is determined,the thin shell shell protection structure is designed and the balance scheme of the pressure inside and outside of the cylinder is determined.The lifting mechanism is designed according to the overall structure of SCM and the layout of internal components.According to the installation mode of SCM,precise docking mechanism and locking mechanism are designed.The response surface method is used to optimize SCMMB and reduce the deformation of SCMMB.According to SCM working condition,the force of the locking mechanism was analyzed and the response surface method was used to optimize the structure of the locking block,so as to reduce the maximum stress of the locking block.According to the installation and working environment requirements of electronic components in Subsea electronic module(SEM),the SEM shell is designed and the failure form of SEM shell is determined.The response surface method is used to optimize the structure of SEM shell and effectively reduce the quality of the shell.According to the water depth and valve actuators pressure,flow and other parameters,the design of high and low pressure output and buck shutoff function of the hydraulic system.This paper designs an integrated valve plate which integrates the valve block and the upper counterpart.According to the characteristics of the oil circuit inside the integrated valve plate,the factors of local pressure drop of the main oil circuit holes in the integrated valve plate are analyzed by using computational fluid dynamics(CFD),and the design and processing criteria of the integrated valve plate are determined.According to the characteristics of PCO(production nozzle opening valve),the influence of pipeline and hydraulic oil parameters on hydraulic impact is analyzed,and the weakening degree of valve plate to pressure impact is analyzed by using Prandtl mixed length theory.AMEsim was used to analyze the influence of hydraulic pipeline parameters on valve opening.The influence of pipeline parameters on emergency relief of hydraulic system is analyzed.Through simulation analysis,it is confirmed that the hydraulic system can open two valves simultaneously.The optimal time interval of continuous valve opening is obtained through simulation analysis of continuous valve opening interval.The experiment verifies that the designed docking mechanism can realize accurate docking,and the onshore experiment verifies that the locking and unlocking of the locking mechanism is effective.The sealing performance of SCM cylinder was tested.The SEM shell is tested by external hydrostatic pressure,and it is verified that the shell meets the requirements of strength and stiffness.The test platform of underwater control module hydraulic system is built,and the basic function of hydraulic system is tested.The static pressure test of the hydraulic system found no leakage and component damage.The experiment of water pool verifies that SCM can control valve actuators in underwater environment. |
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