Abstract:
The invention relates to marine seismic seabed cable (2) for use on or near the seabed (3) comprising one or several pulling cables (11), a data cable (12) and a sleeve (10) which surrounds these. The invention is characterized in that groups of geophones and position metering instruments are placed behing each other along the cable (2), that each group of geophones and position metering instruments are placed in a geophone sphere (6) where the geophone sphere (6) and the actual cables are to a substantial degree mechanically isolated from each other, so that, for example, shocks and signals against the cable (2) will to only a minor extend be transferred to the geophone sphere (6).
Abstract:
A system and method for deploying seismic data acquisition equipment from a moving vessel. The system and method utilize movable pulley systems to manipulate a string of data acquisition equipment such that a technician may attach the seismic data acquisition equipment to a rope or cable during a period in which the rope or cable is stationary relative to the vessel. The system and method allow for equipment deployment at a relatively constant rate while the vessel maintains a relatively constant velocity. The system and method for deploying seismic data acquisition equipment allows for enhanced personnel safety and efficient equipment deployment.
Abstract:
An apparatus for acquiring survey data including streamer equipment comprising a lead-in cable; and a geophysical streamer with a plurality of geophysical sensors distributed along the geophysical streamer, including a forward geophysical sensor; a depressor coupled to the streamer equipment in front of the forward geophysical sensor; a variable tension control device coupled at a back end of the geophysical streamer; and a plurality of tension control system sensors. A method for acquiring survey data including obtaining data from tension control system sensors of a geophysical streamer system; identifying an adjustment to be made to one or more tension control factors of the geophysical streamer system to reduce or control vibrational behavior of streamer equipment of the geophysical streamer system making the adjustment to the one or more tension control factors; and acquiring survey data with the geophysical streamer system.
Abstract:
Unité de mesure non acoustique (5) destinée à être intégrée dans une antenne acoustique tout optique, ladite unité de mesure non acoustique (5) comprenant une portion (12a) d'une fibre optique, dite non acoustique, destinée à véhiculer des mesures non acoustiques, au moins un capteur non acoustique à sortie électrique (4) apte à délivrer au moins un signal électrique représentatif d'au moins une grandeur physique, et un transducteur électro-optique passif (6) soumis audit signal électrique, ledit transducteur électro-optique passif (6) agissant sur une contrainte mécanique subie par une première zone sensible (13) de la portion (12a) de fibre optique, de façon qu'une valeur d'une propriété mesurable d'un premier signal optique véhiculé par la fibre optique non acoustique (12) est représentative du signal électrique, et au moins une cellule photovoltaïque (18) couplée électriquement audit capteur non acoustique (4) pour alimenter électriquement ledit capteur (4).
Abstract:
Die Erfindung betrifft eine Schallwandleranordnung zum Empfangen und/oder Senden von Wasserschallsignalen, wobei die Schallwandleranordnung eine erste Antenne mit mehreren Schallwandlern und ein erstes Schleppkabel aufweist und wobei die Schallwandleranordnung von einem Schleppschiff im Wasser ziehbar ist, und die erste Antenne und/oder das erste Schleppkabel ein Kopplungselement oder mehrere Kopplungselemente aufweist oder aufweisen, sodass die erste Antenne und/oder das erste Schleppkabel mit einer zweiten Antenne und/oder einem zweiten Schleppkabel reversible verbindbar ist oder sind. Des Weiteren betrifft die Erfindung ein Schleppsonar, eine Winde für ein Schleppschiff, ein Schleppschiff und ein Verfahren zum Ausbringen und/oder Einholen einer Schallwandleranordnung und/oder eines Schleppsonars und zum Empfangen und/oder Senden von WasserschallSignalen.
Abstract:
System comprising at least one conductors and at least one sensing node which comprises at least one sensor device wherein each conductor is provided with at least one electrically conductive core surrounded by an insulating sheath wherein the at least one sensor device is electrically connected with at least one conductive core of at least one first conductor of the at least one conductor. The at least one node is provided with an attachment device for mechanically attaching the at least one node to at least one second conductor of the at least one conductor. The attachment device is arranged for mechanically attaching the at least one node to the at least one first conductor such that the insulating sheath at the location where the at least one node is attached to the at least one first conductor remains intact. The node is further provided with an inductive coupling device which is arranged to provide the electrical connection in the form of an inductive coupling of the at least one sensor device with at least one conductive core of the at least one second conductor.
Abstract:
A creep alerting superwide is formed of a hollow braided strength member formed mainly of synthetic fibers and formed about a solid rod of plastic material where disposed within the solid rod and situated at spatial intervals along the long dimension of the solid rod are a plurality of spatially separated remotely detectable objects. Methods for forming the creep alerting superwide include first coupling the remotely detectable objects with the solid plastic rod, then enclosing both within a flow shield sheath, then enclosing the resultant unit within a hollow braided strength member, followed by subsequently tensing and heating the resultant pre-processed rope until the thermoplastic of the rod is molten, the strength member is elongated and the diameter of the rope is reduced, followed by cooling the rope. The change in length of the spatial interval between consecutive remotely detectable objects is monitored over time to alert operators of the danger of rope failure due to excessive creep.
Abstract:
Embodiments, including apparatuses, systems and methods, for attaching autonomous seismic nodes to a deployment cable. In an embodiment, an apparatus includes a seismic node having a direct attachment mechanism configured to directly attach the seismic node to a deployment line, the direct attachment mechanism being configurable between an open and/or unlocked position and a closed and/or locked position to release and retain the deployment line.
Abstract:
Embodiments, including apparatuses, systems and methods, for attaching autonomous seismic nodes to a deployment cable. In an embodiment, an apparatus includes a seismic node having a direct attachment mechanism configured to directly attach the seismic node to a deployment line, the direct attachment mechanism being configurable between an open and/or unlocked position and a closed and/or locked position to release and retain the deployment line.
Abstract:
A marine seismic streamer comprising a solid, hydrophobic core member that is encased in a hydrophobic streamer skin/casing. The hydrophobic streamer skin may be extruded onto and/or heat welded to the hydrophobic core member. The hydrophobic streamer skin/casing may comprise a thermoplastic polyurethane that includes fluorine and/or silicon moieties, silicon, polydimethylsiloxaneor the like. The hydrophobic streamer skin/casing may reduce the drag of the streamer and may provide anti-biofouling properties to the streamer. A hydrophobic paint, coating or polymer may in some instances be disposed on top of the hydrophobic streamer skin/casing.