Drill pipe monitoring of vortex-induced vibration during IODP Expedition 332 observatory installations

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doi: 10.2204/iodp.proc.332.106.2011
Author(s): Kitada, Kazuya; Araki, Eiichiro; Kimura, Toshinori; Kinoshita, Masataka; Kopf, Achim; Hammerschmidt, Sebastian; Toczko, Sean; Saruhashi, Tomokazu; Sawada, Ikuo; Kyo, Masanori; Namba, Yasuhiro; Kido, Yukari; Saffer, Demian M.; Lauer, Rachel; Wheat, C. Geoffrey
Integrated Ocean Drilling Program, Expedition 332 Scientists, College Station, TX
Author Affiliation(s): Primary:
Japan Agency for Marine-Earth Science and Technology, Institute for Research on Earth Evolution, Yokohama, Japan
Other:
Japan Agency for Marine-Earth Science and Technology, Japan
Pennsylvania State University, United States
University of Alaska-Fairbanks, United States
University of Bremen, Germany
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NantroSEIZE Stage 2; riserless observatory; Expedition 332 of the riser drilling platform; Shingu, Japan, to Minami-Ise, Japan; Sites C0002 and C0010; 25 October-11 December 2010
Volume Author(s): Kopf, Achim; Araki, Eiichiro; Toczko, Sean; Kido, Yukari; Hammerschmidt, Sebastian; Kimura, Toshinori; Kitada, Kazuya; Lauer, Rachel; Saffer, Demian M.; Wheat, C. Geoffrey
Source: Proceedings of the Integrated Ocean Drilling Program; NantroSEIZE Stage 2; riserless observatory; Expedition 332 of the riser drilling platform; Shingu, Japan, to Minami-Ise, Japan; Sites C0002 and C0010; 25 October-11 December 2010, Achim Kopf, Eiichiro Araki, Sean Toczko, Yukari Kido, Sebastian Hammerschmidt, Toshinori Kimura, Kazuya Kitada, Rachel Lauer, Demian M. Saffer and C. Geoffrey Wheat; Integrated Ocean Drilling Program, Expedition 332 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.332, 10p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 11 refs.; illus., incl. sketch map
Summary: This study reports on vortex-induced vibration (VIV) suppression methods for long-term borehole monitoring system (LTBMS) installation in areas of strong ocean currents such as the Kuroshio Current. One of the primary challenges in installing the LTBMS was to deploy high-precision, sensitive sensors into the borehole without damaging them during their trip through the water column. Two field tests were performed using accelerometers attached to the instrument carrier and/or drill pipes to collect data on the characteristics and effects of drill pipe VIV. These tests demonstrated that vortex suppression can be achieved by using drill collars and attaching ropes to the drill pipe. Therefore, these methods were applied to the drill pipe (above the sensor assembly) for the actual recovery and installation of the observatory systems during the Integrated Ocean Drilling Program (IODP) Expedition 332. From the observations and data collected over a period of several days of VIV monitoring during the LTBMS installation and SmartPlug retrieval, the following three points can be made regarding VIV suppression: (1) the bottom-hole assembly should be lowered in the low-current area, with the relative current speed being as low as possible, (2) the drifting speed should be kept well below 1 kt, and (3) the drifting angle between drifting direction and sea current should be kept as small as possible (definitely <45°). The results of VIV monitoring during Expedition 332 attest that the amplitude was further reduced to <0.5 g, eventually contributing to the success of the first LTBMS installation at IODP Site C0002.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 30 Engineering Geology; Asia; Continental margin; Drilling; Expedition 319; Expedition 332; Far East; Honshu; IODP Site C0002; IODP Site C0010; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Marine drilling; Monitoring; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Pacific Ocean; Preventive measures; Vibration; Vorticity; West Pacific
Coordinates: N331800 N331800 E1363800 E1363800
N331236 N331236 E1364112 E1364112
Record ID: 2012018516
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