Communications: electrical – Selective – Having indication or alarm
Patent
1975-10-28
1977-07-26
Moskowitz, Nelson
Communications: electrical
Selective
Having indication or alarm
340 9, 340 17R, 181110, 181111, G01V 138, G01V 102
Patent
active
040386309
ABSTRACT:
A method and apparatus for simultaneously towing and handling multiple airguns are disclosed for use in marine seismic surveying which provide for ease in handling large numbers of airguns and enable them to stream out at a desired depth behind a submerged towing head in a long flexible streamer, or a plurality of simultaneously towed airgun streamers, whose level below the surface can be changed, if desired, while the survey is progressing. A plurality of airguns are included in each streamer extending for a length behind the survey vessel for providing an effective geographic diversity in the location of the airguns which can be simultaneously fired, or can be fired with time delay, for generating very powerful large area seismic energy wavefronts travelling down through the body of water. The buoyancy of the airgun streamer is controllable to provide neutral buoyancy during towing, if desired, and slight positive buoyancy to float the streamer in preparation for taking it on board the towing vessel. The streamer can be conveniently hauled on board by hauling along a roller conveyor extending over the stern and can be rolled back along this conveyor for convenient launching into use. In the preferred streamer construction described, each airgun has a generally cylindrical configuration and is of the same diameter, same length and same weight, but its firing chamber volume can be changed and pre-set to various sizes as may be described by the user, and each airgun is axially aligned with and spaced from the neighboring airguns with interconnecting flexible semiinflatable sleeves extending between them.
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Bolt Associates, Inc.
Moskowitz Nelson
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