| In offshore oil and gas development,electro-hydraulic compound subsea production control system is the mainstream mode of subsea production control system.As the control center of subsea production control system,subsea control module(SCM)is responsible for controlling and monitoring subsea equipment,which has become one of the key equipment to ensure the stable and reliable exploitation of subsea oil and gas resources.At present,the core technology of SCM has been monopolized by developed countries in Europe and America for a long time,which seriously restricts the development of deep-sea oil and gas equipment in China.Realizing the localization of SCM has important theoretical significance and practical application value for realizing the independent exploitation of offshore oil and gas in China.In this paper,the design and experimental research of electro-hydraulic composite subsea control module(SCM)are mainly carried out.And the main research work is as follows:(1)The scheme of high reliability electro-hydraulic composite subsea control module has been studied.According to the functional requirements of subsea christmas tree,a set of overall scheme of electro-hydraulic composite SCM is proposed.A new hoisting locking mechanism with positioning and docking is designed to meet the requirement of synchronous and accurate positioning and docking of multi-channel hydraulic joint and electrical joint in the process of installation.And a set of hydraulic system with redundant function is designed in the demand of the valve’s hydraulic drive.Meanwhile,according to the control requirements of subsea christmas tree,a set of cross redundant control system is also designed.(2)The docking and positioning hoisting locking technology of subsea control module(SCM)and the heat dissipation and sealing technology of underwater electronic module are studied.For the positioning and docking mechanism,the mathematical model of maximum docking deviation is established.Genetic algorithm and fmincon function are used to simulate and analyze the model to determine the optimal allowable fit gap between positioning key and slot satisfying the maximum allowable deviation of all joints,thereby improving the success rate of the docking.For the lifting and locking mechanism,the theoretical and dynamic simulation analysis of its underwater locking process is performed to find the required stable torque and maximum torque value provided by the ROV,providing a theoretical basis for the selection of the ROV for the operation;In view of the difficulty of heat dissipation in the underwater closed space,a contact cooling scheme was proposed,a thermal resistance network model was established,and a thermal simulation analysis was performed to verify the effectiveness of the contact cooling scheme.Investigate the effect of water temperature and component power dissipation on SEM temperature rise.In order to solve the static sealing problem of subsea electronic module,a scheme of using dumbbell-shaped instead of O seal ring is proposed.At the same time,the influence of different compression ratio and clearance on sealing effect and life of sealing ring is simulated and analyzed.Finally,the optimal initial compression ratio and clearance of the two kinds of sealing ring are determined.(3)The hydraulic system design and simulation technology of subsea control module has been studied.The mathematical model of the opening and closing of the gate valve is obtained,and the influencing factors of the opening and closing of the valve are analyzed.To meet the requirements of hydraulic system integration,the hydraulic system adopts an integrated layout,and the hydraulic integrated valve plate is designed and checked for dangerous points.Based on Simulation X,a simulation model of low-pressure system charge-discharge pressure and separate operation of deepwater gate valve is established to verify that the hydraulic system design in this paper meets engineering technical requirements.For the problem of difficult to measure the effect of unit parameters on underwater hydraulic control response,the parameters of each component of the system are simulated.Influence on the response time of underwater hydraulic control systems.(4)The function test method of subsea control module has been studied.In this paper,a test prototype of SCM has been developed and the valve actuator been simulated At the same time,a test system of SCM has been built to study the test method of various functions of SCM docking positioning mechanism,hydraulic system and electronic control system,to verify the function of docking positioning of SCM,cross redundancy control function of electronic control system and hydraulic drive ability of hydraulic system;redundant function of oil supply and emergency safety turn-off function,and SEM has good high-pressure sealing performance. |
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