Reduced-drag towing of geophysical equipment
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United States of America Patent
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Feb 2, 2016
Grant Date -
Sep 18, 2014
app pub date -
Mar 14, 2013
filing date -
Mar 14, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques are disclosed relating to reducing drag on cables towed behind a vessel in a body of water. In one embodiment, an apparatus includes a signal source coupled to a survey vessel via a source cable, and the source cable includes a plurality of floats along its length. The floats may in some embodiments allow the source cable to be lifted partially, substantially, or entirely above the surface of the water. Lifting the cable above the surface of the water may in turn decrease the amount of hydrodynamic drag on the cable, reducing the force necessary (e.g., from lateral deflectors on the cable or at the signal source) to tow the source and/or the force necessary to attain a desired lateral position for the signal source. The disclosed techniques may in some embodiments be used to tow such sources at relatively wide lateral separations.
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