Saturday, January 19, 2008 1:03:53 AM
http://www.spawar.navy.mil/robots/pubs/oceans2000.pdf
"The survey systems would be used to survey drilling sites
and pipe routes, and they could also take in-situ soil
measurements and measure seabed currents along the
pipeline route. Douglas-Westwood estimates indicate that
subsea drilling site surveys typically cost from $150k-$250k
for shallow water, with two deepwater sites costing $900k
and $1.4 million [4]. Obviously, reduction of these high
survey costs can shave a lot off the bottom line. In the case of
the Hybrid AUV, cost savings were not projected, however,
the fact that floating production systems are supporting
extensive undersea networks of wells, flowlines, risers and
other subsea hardware, the potential savings for an AUVbased
intervention system, operating from the floater itself,
could be significant.
Another analysis by C&C Technologies, Inc. showed that
the total cost of a deepwater survey could be cut from $707k
using a deep-towed system ($26k/day with ship) to $291k
using an AUV ($55k/day with ship) [5]. That is a whopping
$416k (59%) savings. A similar conclusion was also reached
by the U.S. Navy prior to the development of their 20,000
foot Advanced Unmanned Search System (AUSS). Analysis
indicated an order of magnitude reduction in full ocean depth
survey time could be achieved if an AUV was used. Thus,
even considering the cost of transit time, the increased on-site efficiency of an AUV over towed systems is such that the
overall cost will come down. Time is money."
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