Reliability Analysis And Software Development Of Subsea Oil And Gas Production Control System

The subsea production and development of deep-sea oil and gas fields requires high reliability of subsea control system.At present,there is no special targeted calculation method and software to calculate its reliability in China.According to the requirements of the project of localization subsea control system of the Ministry of industry and information technology,this thesis studies the reliability calculation method and software implementation of subsea control system,which is of great significance and good application prospect.Firstly,this thesis proposes a comprehensive reliability calculation algorithm.There are many complex structures in subsea control system,such as cross redundancy and selectors.The traditional reliability block diagram algorithm can only deal with the situation that the reliability of redundant branches is not interrelated,can not deal with the reliability calculation of complex structures in subsea control system;The disjoint minimal path set method can deal with the situation that the reliability of each redundant branch is related,but it will lead to too much calculation.Aiming at the defects of reliability block diagram algorithm and disjoint minimal path set method,this thesis uses disjoint minimal path set method to deal with the situation that reliability of each redundant branch is related,and then summarizes it into the reliability block diagram algorithm which is considered as the main algorithm to calculate the holistic reliability of subsea control system.In addition,the calculation formula of the minimal path set simplified by the disjoint method is extended to meet the needs of application of reliability analysis of subsea control system.The example calculation and analysis show that the comprehensive reliability calculation algorithm has better applicability and less computation than the traditional algorithm.Secondly,this thesis realizes the graphical structure modeling of subsea control system.Establish the equipment module library of subsea control system,and set the module size and connection point position.By dragging the module to the modeling area and using the established connection line tool to graphically connect the connection points of each module.The graphical holistic structure model of the system will be generated.Select the equipment module graphics in the modeling area to add connection and reliability attributes to the equipment graphical modules.Then,this thesis realizes the automatic construction of reliability model.Based on the graphical model,the connection and reliability attributes of each graphical module are obtained,and the holistic reliability model of the system is automatically constructed.And then,this thesis realizes the automatic calculation of the holistic reliability of the subsea control system.According to the obtained system reliability model,the automatic reliability calculation software module developed based on the comprehensive reliability calculation algorithm proposed in this paper is used to realize the automatic reliability calculation of the graphical model.Finally,aiming at the specific example of the subsea control system of the demonstration application project of the Ministry of industry and information technology,this thesis carries out the graphical structure modeling of the complex structure,realizes the automatic calculation of the reliability of the graphical model,and verifies the availability of the comprehensive reliability calculation algorithm and software.It lays a foundation for the industrial application of domestic subsea control system.