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Shell
Successfully Deployed LinkQuest抯
9600 Baud Acoustic Modems with ADCP
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Shell
Oil Company has successfully completed deployment of
LinkQuest's high speed underwater acoustic modems in the
Gulf of Mexico in high-noise offshore drilling
environment. Shell used LinkQuest抯 acoustic modems
instead of cable to upload current profiles from sub-sea
ADCP in real-time. The reliability and efficiency of the
modems were validated in the test.
From
November 3, 1999 to December 19, 1999, LinkQuest's UWM2000
acoustic modem was deployed with a 300 kHz RDI Workhorse
ADCP at 900 meters below sea surface from an actively
drilling platform, Ocean Worker, in the Gulf of Mexico.
The surface modem, connected to a PC on the platform, was
hung about 30 meters below sea surface from the platform.
Due to the robustness of the modem, system installation
was easily accomplished with the help of an ROV.
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The
ADCP was configured to send current profile every 15
minutes. Overall, more than 4000 current ensembles (2.5
mbytes) of data were sent from the Workhorse ADCP. While
data were sent through the acoustic link in real-time, the
ADCP recorder also kept a record of all the current
ensembles. By comparing the logged current ensembles at the
surface PC obtained through the acoustic link and the
current ensembles in the ADCP recorder, it is concluded that
there was no loss of any current ensemble and no error in
the data.
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Over
the past few years, Shell has tested acoustic modems from
several manufacturers for current monitoring. This
deployment is the first time Shell has succeeded in using
acoustic modems reliably with ADCP for long term current
monitoring. Shell is pleased with the results and placed
an order soon after the completion of the deployment.
Shell plans to use LinkQuest's deep water modems for
further deployment with ADCP in the Year 2000.
LinkQuest
has integrated its modems with RDI 300 kHz Workhorse
Sentinel, 1200 kHz Workhorse Monitor and 75 kHz Workhorse
Long Ranger. The integration of the modems with Workhorse
ADCP is transparent and easy. The users will still be able
to use RDI software such as WATCH, TRANSECT and BBTALK in
the way they used to. The modems can also upload mega
bytes of data from Workhorse recorder using the Y-modem
protocol.
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LinkQuest, Inc. 1999 Last Updated July 2003 |
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