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Abstract This article investigates two effects of seal friction of hydropneumatic Passive Heave Compensator (PHC) during offshore drilling for contact and non-contact operations. The first is the attenuation rate variation… Click to show full abstract
Abstract This article investigates two effects of seal friction of hydropneumatic Passive Heave Compensator (PHC) during offshore drilling for contact and non-contact operations. The first is the attenuation rate variation of the transmitted heave movement in function of the amplitude of the platform motion. The second is the Compensator-Induced Vibration (CIV), which induces longitudinal oscillations of frequencies higher than the heave motion. These phenomena are explained by an analysis of PHC forces (linearization and frequency spectra) and a modal analysis of the drill string dynamic with PHC (mode shapes and boundary conditions). An active controller is proposed to mitigate the seal friction of PHC in part II of this two part paper series.
Journal Title: Ocean Engineering
Year Published: 2020
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