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US 2006/0140053 A1Published application
Sensor arrangement and method for the installation and moving of this
AssigneeSeaBed Geophysical AS
InventorJohan Nas
Life of this patent
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AssigneeSeaBed Geophysical AS
InventorJohan Nas
Estimating the term…
Arrangement for use for seismic surveys of geological formations in a seabed, where a plurality of such arrangements, which are provided with sensor units 26, are placed on the seabed for collecting pressure waves and shear waves reflected from the geological formations. There exist arrangements for transferring seismic data to a surface receiver placed on a vessel, an offshore installation, or an onshore installation. Each sensor unit 26 is held by a carrier 10 and is connected to a cylindrically skirt-shaped structure 19 adapted to be led down into the seabed, and each sensor unit 26 comprises at least one geophone. The carrier 10 comprises a holder 12 for the cylindrically skirt-shaped structure 19, which structure 19 shall penetrate down into the seabed, as this holder 12 is adapted to be moved between a lower position and an upper position, to be able to be mechanically released from the skirt-shaped structure 19.
Arrangement for use for seismic surveys of geological formations in a seabed, where a plurality of such arrangements, which are provided with sensor units, are placed on the seabed for collecting pressure waves and shear waves reflected from the geological formations, and where there exist arrangements for transferring seismic data to a surface receiver placed on a vessel, an offshore installation, or an onshore installation, as each sensor unit is held by a carrier and is connected to a cylindrical skirt-shaped structure adapted to be led down into the seabed, and where each sensor unit comprises at least one geophone, wherein the carrier comprises a holder for the cylindrically skirt-shaped structure, which structure shall penetrate down into the seabed, as this holder is adapted to be moved between a lower position and an upper position, to be able to be mechanically released from the skirt-shaped structure.
Method for deployment of a sensor unit for seismic surveys on the seabed, where a carrier arrangement is lowered down and placed on the seabed to carry the sensor unit, and where a tube-shaped element is forced down into the seabed to collect pressure waves and shear waves reflected from geological formations, as seismic data generated in this fashion is transferred to an above-water receiver for storage and processing, wherein the carrier arrangement, after the forcing down of the tube-shaped element into the seabed, is released from this, and that at least a contact face of the carrier arrangement against the tube-shaped element is elevated from contact with this.
Dependencies are inferred from the claim text.