Pgs Geophysical As

Einar Nielsen

Karl Petter Elvestad

Rune Tønnessen

Mattias Südow

Kenneth Karlsen

Erling Vageskar

Jan Terje Rodseth

Arnt M Bjorno

A system can include a float, a winch, a line, and a collapsible fairing. The winch can be coupled to the float. The line can be associated with the winch, where the winch is configured to extend and retract the line. The collapsible fairing can surround the line. Extension and retraction of the line can cause the collapsible fairing to extend and collapse.

Collapsible fairing

Techniques are disclosed relating to marine geophysical prospecting. According to some embodiments, a survey vessel may tow a streamer through a body of water. If the streamer needs to be maintained (e.g., cleaned, repaired, or serviced), a second vessel may lift the streamer out of the water for this purpose. Techniques are disclosed that are relevant to the handling of protruding members (such as streamer steering devices) on the streamer.

Marine streamer handling

Buoy for marine surveys. At least some of the illustrated embodiments are a buoy including an elongated main body and a mast system coupled to the elongated main body. The mast system includes: a forward mast; an aft mast; a spanning portion coupled between a distal end of the forward mast and a distal end of the aft mast; and an aperture defined at least in part by the main body, forward mast, aft mast, and spanning portion. The buoy is configured to float in water such that the water level intersects the forward mast and aft mast, the elongated body is submerged, and the spanning portion resides above the water level.

Buoy for marine surveys

A system. At least some illustrative embodiments are a system including a first survey vessel and a first tow line coupled to the first survey vessel. A first sensor streamer is coupled to the first tow line. Also includes are a second survey vessel and a second tow line coupled to the second survey vessel. A second sensor streamer is coupled to the second tow line and a pulling line is connected between the first tow line and the second tow line.

Sensor towing by marine vessels

Techniques are disclosed relating to using a remote operated vehicle (ROV) to facilitate cleaning of a submerged geophysical equipment (e.g., a streamer) being towed behind a tow vessel. The ROV may, in one embodiment, attach a streamer cleaning unit (SCU) to the streamer, where the SCU is configured to clean the streamer. In another embodiment, the ROV may facilitate cleaning by cleaning the streamer itself using a cleaning attachment coupled to the ROV.

Method and apparatus to facilitate cleaning marine survey equipment

Disclosed are methods and systems for controlling depth profiles of marine geophysical sensor streamers as they are towed in a body of water. An embodiment discloses a method for marine geophysical surveying, the method comprising: towing a geophysical sensor streamer in a body of water having a surface and a floor, the geophysical sensor streamer being coupled to a survey vessel by a lead-in cable, the lead-in cable having a length that extends from the survey vessel; adjusting the length of the lead-in cable to cause a forward end of the geophysical sensor streamer to follow a depth profile; and deflecting the geophysical sensor streamer in the vertical plane at one or more spaced apart locations.

Growing community of inventors

Bekkestua, Norway

Einar Nielsen