Connecting device for wide tow survey
AssigneeFugro-Geoteam AS.
InventorMartin Hartland
Life of this patent
Estimating the term…
Abstract
Marine seismic survey using an array (6) of streamers (8) towed behind a vessel (2) and carrying acoustic sources (4) and sensors (10), spreading means (12, 14, 22, 23, 24) for keeping the streamers (8) at a given distance by lateral tensioning, and bridles (16) for connecting the spreading means and towing ropes and cables. The bridles (16) are comprising at least one solid link or connection device (26) for releasable connection to lines under tension and extending in different directions.
Claims17
A marine seismic survey apparatus employing seismic equipment comprising:
- an array streamers;
- lead-in cables and an outermost tow rope for towing said array of streamers,
- paravane for keeping the streamers at a given mutual distance by lateral tensioning, and
- a bridle unit for connecting the paravane to the array of streamers, the lead-in cables and the outermost tow rope,
- wherein said bridle unit comprise at least one solid link device designed for a releasable connection to lines under tension and extending in different directions, and
- said link device comprising a central bar having at one end at least one rotatable plate carrying at least one sheave and configured for the insertion of eye splices, and at the other end a hinged multiple fastener configured for fastening paravane ropes, thereby allowing the bar to align with a sum of vector forces present in connected ropes or cables at either bar end.
A connecting device for connecting a paravane to a streamer and a wide tow rope, the connecting device comprising:
- a central bar having first and second ends;
- at least one rotatable plate attached to the first end of the central bar, the rotatable part being configured to carry first and second sheaves;
- two clamps attached to the second end of the central bar;
- wherein the first sheave is connected to the streamer;
- the second sheave is connected to the wide tow rope, and
- the first and second clamps are connected to the paravane.
A method for connecting a paravane to a streamer and a wide tow rope for a seismic marine system, the method comprising:
- attaching at least one rotatable plate to a first end of a central bar, the rotatable part being configured to carry first and second sheaves;
- attaching two clamps to a second end of the central bar;
- connecting the first sheave to the streamer;
- connecting the second sheave to the wide tow rope;
- and
- connecting the first and second clamps to the paravane.
Dependencies are inferred from the claim text.