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EP0941490A1 - Deflecteur - Google Patents

Deflecteur

Info

Publication number
EP0941490A1
EP0941490A1 EP97911524A EP97911524A EP0941490A1 EP 0941490 A1 EP0941490 A1 EP 0941490A1 EP 97911524 A EP97911524 A EP 97911524A EP 97911524 A EP97911524 A EP 97911524A EP 0941490 A1 EP0941490 A1 EP 0941490A1
Authority
EP
European Patent Office
Prior art keywords
deflector
vessel
wings
relation
wing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97911524A
Other languages
German (de)
English (en)
Other versions
EP0941490B1 (fr
Inventor
Michael John Rusell
Erik Godoy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petroleum Geo Services AS
Original Assignee
Petroleum Geo Services AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petroleum Geo Services AS filed Critical Petroleum Geo Services AS
Publication of EP0941490A1 publication Critical patent/EP0941490A1/fr
Application granted granted Critical
Publication of EP0941490B1 publication Critical patent/EP0941490B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables

Definitions

  • This invention relates to a deflector for towing after a vessel, especially for use in seismic surveys at sea, being adapted to pull equipment to a transversal position in relation to the vessels moving direction, comprising at least one connecting point for coupling, through wires or similar, to the vessel and the equipment to be towed, and two or more deflector wings adapted to provide a lifting force transversally in relation to the direction of the vessels movement.
  • the invention provides an active deflector which, depending on its dimensions, may double the width of the seismic survey, and thus halve the number of passes of the vessel over the area to be surveyed.
  • the deflector according to the invention may be used in surveys with ordinary widths, where the dimensions are reduced, so that the towing resistance from the system is reduced. Because of the shape of the cylinder it will not affect the passive lifting capability of the deflector significantly, so that the seismic cables are kept at a certain distance from each other even if the power supply fails, and damages on the seismic cables are reduced.
  • Figure 1 shows a section of the deflector, seen from above.
  • Figure 2 shows the deflector seen from one side.
  • Figure 3 shows the deflector incorporated in a system comprising two vessels and a number of seismic cables .
  • a section of a deflector according to the invention is shown comprising the three wings 3,3a and a rotating cylinder 2 in the front of the foremost wing 3a.
  • the deflector also comprises two connecting points 4 for coupling to the towing vessel 7, and to the towed equipment 2.
  • rotating cylinder 2 is, in the figure, positioned in front of the foremost wing, which is the position providing the greatest effect in the illustrated example.
  • Rotating cylinders may also be mounted in the other wings to improve the lift even further.
  • the cylinder described here may, however be shaped in different ways, with a constant diameter along their complete axis or with a varying diameter preferably adapted to the shape of the associated wing.
  • the wing and the cylinder are preferably adapted to each other so that they together constitute a deflector wing having a certain lift when the cylinder is not activated.
  • the cylinder may be driven in different ways, e.g. using hydraulic or electrical engines (not shown) .
  • the rotational velocity of the cylinder may be controlled in a simple way to adjust the lift of the deflector.
  • Figure 2 shows the deflector as seen from one side, being equipped with plates 10,11 on the upper and lower sides connecting the wings 3a, 3 to each other, and also a container 5 on the upper side.
  • the container 5 may contain different control mechanisms, drive units for the cylinder (s) and, in some cases, power supplies for the cylinder (s) . It may also comprise a buoyancy tank for keeping the deflector in a required position in relation to the surface. The latter may also be obtained using additional wings (not shown) being capable of steering the deflector to a certain depth.
  • the support vessel 9 may provide electrical or hydraulic power through the cable, in addition to control signals or the like for controlling the deflector.
  • the support vessel may provide a certain towing force which may contribute in increasing the distance, perpendicular to the moving direction, between the towing vessel and the deflector.
  • the support vessel 9 may preferably be remote controlled so that the position relative to the towing vessel is controlled continuously. In the same way the positions of the deflectors in relation to the towing vessel may be remote controlled via the support vessel and a cable
  • the support vessel should, however, be manned to be able to provide maintenance and repairs on board regardless of weather conditions.
  • the support vessels may also be equipped with seismic sources or receivers to contribute to the data acquisition in the survey.
  • FIG 3 also shows a number of seismic cables, comprising seismic receivers and/or sources, being towed behind the towing vessel.
  • the width of such as search may be up to 800 metres with 10 cables.
  • this width may be increased to 2000 metres, with 18 cables 8. This means considerable reductions in expenses, which allows for the use of the support vessels.
  • the deflectors characteristics as a passive deflector avoids a total collapse of the spread of the search, so that the cables do not come close to each other and damaged, and the seismic survey in some cases may be continued, but to a limited extent.
  • the construction of the couplings between the towing wires, power supplies, deflectors and vessels may comprise any solution and are not relevant to this invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Déflecteur destiné à être remorqué par un bâtiment, utilisé en particulier en relation avec des relevés sismiques et adapté pour tirer un équipement dans une direction transversale par rapport à la direction de déplacement du bâtiment. Ledit déflecteur comporte au moins un point de connexion (4) permettant de le connecter, par l'intermédiaire de câbles (12) ou analogues, au bâtiment (7) et à l'équipement (8) à remorquer. Deux ou plusieurs ailes (3, 3a) de déflecteur (1) sont adaptées pour fournir à ce dernier une force de levage transversalement par rapport à la direction de déplacement du bâtiment, au moins une desdites ailes (3, 3a) étant dotée d'un cylindre rotatif placé en face de l'aile et adapté pour augmenter le levage de cette aile de déflecteur, et une unité d'entraînement destinée à entraîner le cylindre rotatif à l'aide de dispositifs correspondants d'alimentation électrique.
EP97911524A 1996-12-06 1997-11-14 Deflecteur Expired - Lifetime EP0941490B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO965214A NO305674B1 (no) 1996-12-06 1996-12-06 Deflektor med justerbar vinge for seismisk slep
NO965214 1996-12-06
PCT/NO1997/000302 WO1998025162A1 (fr) 1996-12-06 1997-11-14 Deflecteur

Publications (2)

Publication Number Publication Date
EP0941490A1 true EP0941490A1 (fr) 1999-09-15
EP0941490B1 EP0941490B1 (fr) 2002-05-08

Family

ID=19900149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97911524A Expired - Lifetime EP0941490B1 (fr) 1996-12-06 1997-11-14 Deflecteur

Country Status (5)

Country Link
EP (1) EP0941490B1 (fr)
AU (1) AU4887797A (fr)
DE (1) DE69712513D1 (fr)
NO (1) NO305674B1 (fr)
WO (1) WO1998025162A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ332366A (en) * 1996-04-30 2000-04-28 Helgi Larsen Otter board with at least two foils between longitudinally extending ribs to form tapered channel(s)
EP1324915B1 (fr) * 2000-09-28 2005-01-05 Westerngeco AS Deflecteurs
WO2002030736A1 (fr) * 2000-09-28 2002-04-18 Westerngeco As Dispositifs deflecteurs
US6532189B2 (en) * 2000-11-30 2003-03-11 Westerngeco L.L.C. Curved float for marine divertors
NO321016B1 (no) 2001-01-24 2006-02-27 Petroleum Geo Services As System for styring av kabler i et seismisk slep og hvor noen av kablene har kontrollenheter innrettet for a male og rapportere om sine posisjoner
NO20035477L (no) * 2003-12-09 2005-06-10 Henning Skjold Larsen Drivanordninger, justeringsanordninger og system i forbindelse med en tral samt fremgangsmate for traling og styringssystem for bruk i fremgangsmaten
US7404370B2 (en) * 2006-08-02 2008-07-29 Pgs Norway Geophysical As Steerable diverter for towed seismic streamer arrays
DK2182797T3 (en) * 2007-07-31 2017-07-10 Thyborøn Skibssmedie As High-efficiency trawl bucket with high stability
US7881153B2 (en) 2007-08-21 2011-02-01 Pgs Geophysical As Steerable paravane system for towed seismic streamer arrays
US8267031B2 (en) 2010-02-24 2012-09-18 Pgs Geophysical As Tension management control system and methods used with towed marine sensor arrays
US9664811B2 (en) 2012-12-19 2017-05-30 Pgs Geophysical As Methods and systems for using a combined electromagnetic source electrode and deflector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630997A (en) * 1981-11-24 1986-12-23 Fondation Cousteau Apparatus for producing a force when in a moving fluid
US4729333A (en) * 1986-07-09 1988-03-08 Exxon Production Research Company Remotely-controllable paravane
DE69302513T2 (de) * 1992-03-24 1996-09-19 Geco As Ottergerät
GB2293806A (en) * 1994-09-10 1996-04-10 Edwin Ashworth Marine Ltd Cable separator.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9825162A1 *

Also Published As

Publication number Publication date
NO965214L (no) 1998-06-08
NO305674B1 (no) 1999-07-05
NO965214D0 (no) 1996-12-06
WO1998025162A1 (fr) 1998-06-11
EP0941490B1 (fr) 2002-05-08
DE69712513D1 (de) 2002-06-13
AU4887797A (en) 1998-06-29

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