Research On Deepwater RAM BOP And Electromagnetic Control Valve

Deepwater drilling equipments are leading equipments for exploration and exploitationof oil and gas offshore. Deepwater drilling well control equipments, such as the BOP and theElectromagnetic control valve, are the key equipments to guarantee safety and reliability ofthe drilling operation. In order to prevent a blowout or kick accidents, the BOP stack isrequired to close the oil well quickly to ensure safety of personnel and equipments whendrilling in deepwater. But, it is extremely difficult to escape and rescue in deep water area ofthe sea when accident happens. So, requirements of the BOP stack Electromagnetic ControlValve is very high in the aspects of technical performance and safety reliability. ForDeepwater BOP stack, only Cameron、Varco Shaffer、GE Hydril companies’ products are inuse worldwide, and these three large companies are in monopoly positions both in the field oftechnology and market. Although there are several domestic companies develop products inthis area, but the products are still not actually put into use. Development of domesticDeepwater Electromagnetic Valve is nearly in the blank stage, no domestic company canexploit the Electromagnetic Control Valve independently till now. Therefore, in order toexplore and exploit the oil and gas resources in the South China Sea independently, as well aspromote the development of Deepwater drilling mining technology in China, it is necessary tocarry on in-depth study of the Deepwater BOP and Electromagnetic Control Valve. This paperdevelops a deepwater ram BOP and Electromagnetic Control Valve by learning advanced wellcontrol equipments, mature technology of Deepwater BOP stack.A model prototype of Deep-water Ram blowout preventer is established. Components ofthe BOP implementation are modularly designed and are mounted on the rail for modulardecomposition, which makes it easier for repair and replacement of the gate assembly so as tosave time and manpower, Magnetostrictive sensor is utilized for real-time monitoring of theactual position of the execution unit, Hydraulic switching valve is installed between the twosets of hydraulic control system to eliminate the interference between the two sets of controlsystem, the flow of the hydraulic system is simplified and reliability is improved, The lockingdevice is installed to maintain the BOP preventer normally work for a long time. According to the high water pressure working condition of the DeepwaterElectromagnetic Control Valve, Deepwater Electromagnetic Control Valve structure adoptingembedded design methods is designed. In order to solve the problem of disturbance ofhydraulic power and difficulty of choosing reset spring, we design the steel core and valvecore into the differential structure.Multi-physics coupling analysis software (COMSOL Multiphysics) is used, dynamicperformance analysis of electromagnetic control valve is carried and dynamic physicalquantities of electromagnetic control valve are drawn.The rationality of physical design isverified by comparing experiment data and theoretical data.Matlab numerical software is used to conducted magnetic circuit analysis so as toanalyze the Electromagnetic Control Valve performance. A dynamic model is established withSimulink, relationships between derived current、speed、acceleration、displacement and thechange of time are obtained, respectively. Besides, response time of the ElectromagneticControl Valve is given.