Abstract
Abstract Presented in this paper is a model-based approach for performance and health monitoring of a double spool blowout preventer (BOP) pressure regulator. Governing equations of the pressure regulator are derived based on mathematical and functional relationships. The relationships are carried to a simulation environment. Same approach is followed to generate the model of an annular preventer control circuit from the hydraulic power unit to the preventer itself. The nominal performance the regulator during an annular preventer closing event and effects of internal leakages are shown via simulation. Model-based condition and performance monitoring techniques are developed to detect regulator internal leakages and regulator instabilities. The methods are demonstrated over a dataset obtained from a deepwater BOP. The results show that the leakage detection method can differentiate between a leaking and non-leaking regulator within the same BOP, and that regulator instabilities can be detected with the given sensor set and data acquisition capabilities.
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