A data acquisition program has been performed to examine accelerations and displacements of a full scale drilling riser in 1300 m water depth off the coast of mid Norway. The data was collected during BP's Nykhogda (Nyk High) drilling programme that was carried out from the 7th May to the 20th July 1997. The present experiment is the first of three planned under the 'Norwegian Deepwater Programme'. The riser instrumentation consisted of five accelerometer units with two linear accelerometers in each unit. Two of the units were in addition equipped with two rotational rate sensors. An accelerometer unit consisting of five sensors was installed on the platform itself to monitor the platform motion. In addition, a set of instruments was moored to record the time and depth dependent currents at the location. A successful data retrieval was achieved for all the accelerometers covering a period of 74 days. The data analysis has revealed flow induced riser oscillations with several possible mode shapes. The present paper deals with the field experiment design and some features of the observed accelerations.
Field study of flow induced vibrations on a deepwater drilling riser
1998
10 Seiten, 4 Quellen
Conference paper
English
A Field Study of Flow Induced Vibrations on a Deepwater Drilling Riser
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