Abstract:
A towed streamer including a hydrophone (1) supported, in a filler (4) being either liquid or semi-liquid such as a gel having wave damping properties, within a housing (2). The housing (2) is in the form of a tube whose ends are closed by closures such as rigid plugs (3). Where liquid is used wave damping baffles such as open cell foam structures are provided. A rigid shielding arrangement in the form of reinforcing strips (5) can be provided to shield the hydrophone from bulge waves.
Abstract:
Câble d'hydrophone possédant une série d'hydrophones (7) à des intervalles espacés le long du câble et possédant des organes de renforcement (1) et des conducteurs de lignes de transmission (3) s'étendant le long du câble, dans lequel on utilise une construction sous presse (2, 3, 4 et 5) qui peut être relachée pour l'insertion des hydrophones (7) dans le câble, les vides dans le câble étant remplis d'un gel flottable et l'assemblage étant recouvert d'une feuille extérieure en plastique (6).
Abstract:
A seismic apparatus includes one or more seismic cable systems configured to acquire seismic data, each seismic cable system having one or more of a cable jacket, a reservoir for a ballast fluid or other ballast medium, and an actuator or other transfer mechanism configured to transfer the ballast fluid between the reservoir and the seismic cable system during acquisition of the seismic data, e.g., where the ballast fluid is transferred to the seismic cable system within the cable jacket. A controller can be configured to adjust a buoyancy of the seismic cable system responsive to the transfer of the ballast fluid, e.g., where the internal volume expands or contract based on the fluid transfer.
Abstract:
Die Erfindung betrifft einen Schleppkörper (105) zum Schleppen im Wasser, welcher mindestens eine Anschlusseinheit (106,107,108) aufweist und welchem mindestens ein erster aktiver Schallwandler (118) zuordenbar ist oder welcher diesen aufweist, wobei der Schleppkörper derart eingerichtet ist, dass der Schleppkörper mit dem ersten aktiven Schallwandler und/oder einem zweiten aktiven Schallwandler und/oder einem dritten aktiven Schallwandler und/oder einem vierten aktiven Schallwandler und/oder weiteren aktiven Schallwandlern adaptierbar ist, sodass im Fall von zwei oder mehreren aktiven, Schallwandlern eine Sendeleistung und/oder eine Bandbreite eines ausgesendeten Schallsignals erhöht oder verbreitert., ist. Des Weiteren betrifft die Erfindung eine Schleppantenne (119) und ein Schleppsonar (110) zum Schleppen im Wasser sowie eine Verbringeinrichtung (103) und ein Schiff (101).
Abstract:
L'invention propose un dispositif accéléromètre pour déterminer l'accélération d'un objet auquel le dispositif accéléromètre est mécaniquement relié, suivant 3 axes X, Y et Z d'un système de référence principal orthonormé comprenant trois axes X, Y, Z. Ledit objet étant soumis à une pression environnante et comprend un nombre N de capteurs accéléromètres de type MEMS, ledit nombre N étant au moins égal à deux. Chaque capteur étant défini dans un système de référence auxiliaire comprenant 3 axes orthonormés. Ledit ensemble de capteurs accéléromètres comprenant au moins une paire de capteurs montée tête opposée et sensiblement parallèles entre eux.
Abstract:
A system (1) for attaching a plurality of seismic nodes (110, 110a) along a main carrier rope (101). The main carrier rope is made of steel or synthetic fibre, and comprises no power or communication lines. The system has a length measuring device (210) for providing a measured length ( L m ) of deployed main carrier rope (101); a data source (220, 230, 240) for providing positioning data affecting the rope position of each seismic node (110, 110a) on the main carrier rope (101); a control unit (200) for providing an attachment command whenever the measured length ( L m ) corresponds to a rope position of a seismic node (110, 110a) computed from the positioning data; and a node attaching unit (100) for attaching a seismic node (110, 110a) to the main carrier rope (101) in response to the attachment command. The system is capable of attaching nodes (110) with different node spacing between some or all nodes along the main carrier rope (101). As the rope positions are determined by the measured length ( L m ), the system automatically compensates for creep or stretch in the main carrier rope (101).Attaching a seismic node (110) to the main carrier rope (101) at any rope position by means of a clamping device, a suspension device and a fly line is also disclosed.
Abstract:
A flexible float (2) for a marine seismic source (1), the flexible float (2) comprising a head member (10), a plurality of connection members (12) and a tail member (13), where the head member, connection members and tail member are connected by tubular flexible float members (11) to make a flexible elongated float, where suspension lines (4) and a steering line (5) are connected to the connection members (12) and head member (10), wherein a pneumatic cable (6) for providing pressurized air to the flexible float (2) is connected to the tail member (13), where air hoses (49, 49') and air tubes (33) are arranged to deliver pressurized air to each of the connection members (12) and the head member (10), and where each of the connection members (12) and head member (10) comprises one or more air operated winch for adjusting the length of the suspension lines (4) and the steering line (5), and a marine seismic source comprising the flexible float, are described.
Abstract:
Methods, systems, and apparatuses are disclosed for sensing acoustic waves in a medium. One example system includes a first elongated member, a first motion sensor sensitive to vibrations of the first elongated member, a second motion sensor spaced apart from the first motion sensor and also sensitive to vibrations of the first elongated member, and a first vibration source operably coupled to the first elongated member and configured to vibrate the first elongated member.
Abstract:
A marine survey acquisition system. The system may include a vessel for towing a marine survey spread. The marine survey spread may include streamers, marine vibrators and a cable. The cable may be coupled to a respective streamer from among the streamers and one of the marine vibrators. The cable may power the respective streamer and the one of the marine vibrators. The one of the marine vibrators may emit energy at a high frequency range.
Abstract:
A system comprises towed marine geophysical equipment, adapted for towing through a body of water; and a surface covering, comprising a textural attribute of shark skin, attached to the marine geophysical equipment. A method comprises towing marine geophysical equipment having a surface covering, comprising a textural attribute of shark skin, attached thereto.