Abstract:
Die Erfindung betrifft ein Verfahren zur Fertigung eines Unterwasserkabels (101), insbesondere eines Schleppkabels für eine Schleppantenne eines Wasserfahrzeuges, wobei das Unterwasserkabel (101) einen Kabelkern (110) und einen Außenmantel (108, 109) aufweist, und mindestens der Kabelkern (110) unter einem Druck, welcher vom Umgebungsdruck abweicht, gefertigt, wird, sodass der Kabelkern (110) luftblasenarm hergestellt wird und das Unterwasserkabel, welches auf eine Verbringtiefe unter Wasser und anschließend wieder an die Oberfläche des Wassers gebracht wurde, maximal eine Dichteänderung von ±5,0%, insbesondere ±3,0% oder ±1,5%, aufweist. Des Weiteren betrifft die Erfindung ein Unterwasserkabel, ein Unterseekabel, ein Schlepp-Sonar und ein Fahrzeug.
Abstract:
A marine seismic streamer cable system includes an outer streamer skin defining a longitudinally extending tube; a strength member extending longitudinally through the interior of the tube; seismic sensors located inside the tube and connected to one another electronically so as to transmit power and seismic data signals; an optical fiber extending longitudinally through the tube and configured so as to physically be coupled to the tube so that bending of the tube will directly transmit bending to the optical fiber; and an optical measurement unit that is optically connected with the optical fiber so as to measure optical transmission through the optical fiber and thereby determine various aspects of the optical fiber that are indicative of stress and strain experienced by the streamer.
Abstract:
Method for obtaining zero offset or near zero offset data in a marine seismic streamer survey. An acoustic transmitter (41) is attached to one of the buoys (14 or 16) that provide flotation to each streamer (12) and tow umbilical (13). The acoustic transmitters, or single transmitter in the case of a 2-D survey, may be fired (71-73) before each shot from the survey air guns. The response to the acoustic transmitters recorded by the near sensors in each streamer, or by a water break sensor if provided, will be a near-zero to zero-offset record of the shallow subsurface below the water bottom.
Abstract:
A system and method for improved active land streamers is disclosed. A land streamer system includes a piezoelectric module having an opening that extends through the piezoelectric module. The land streamer system also includes a power cable configured to traverse the opening. The power cable includes a plurality of sub-cables, and a first sub-cable of the plurality of sub-cables is configured to be connected to the piezoelectric module. The land streamer system also includes a computing system configured to provide an electrical signal to the piezoelectric module via the plurality of sub-cables.
Abstract:
A cable for land based seismic array system includes a plurality of fibers, an aramid strength member, and a thermoplastic polyurethane (TPU) Jacket, wherein a total number of the plurality of fibers is greater than or equal to 48, a diameter of the cable is less than 10 millimeter (mm), and a weight of the cable per unit distance is less than 50 kilogram (Kg) / kilometer (Km).
Abstract:
A seismic data collection system is disclosed. The system may include at least a first housing and a second housing. The first housing may be configured to detachably couple to the second housing. The system mays also include various components such as one or more seismic sensors, a clock, or memory. Each of the components may be arranged in one of the first housing or second housing.
Abstract:
The present invention relates to a system for towing a tow (12) comprising seismic sensor cables (2) in completely or partly ice-covered water (8), where a towing vessel (1) tows the tow, and the tow at one side comprises a deflector (4) pulling sideways away from the tow (12), where a support vessel (7) is connected to and tows the deflector (4). The invention also relates to a method for towing a tow (12) comprising seismic sensor cables (2) in completely or partly ice-covered water (8), where a towing vessel (1) tows the tow, and the tow on one side comprises a deflector (4) pulling sideways away from the tow (12), where a support vessel (7) is connected to the deflector (4), and the deflector is towed by the support vessel.
Abstract:
An underwater utility line, and associated systems and methods are disclosed. The underwater utility line can include an adjustably buoyant tube. The underwater utility line can also include a transmission line to transfer energy disposed in an interior of the adjustably buoyant tube. The underwater utility line can further include a gas source and a controller to control the gas provided by the gas source to alter the buoyancy of the adjustably buoyant tube.
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 streamer spread (800) for acquiring seismic data, the spread including a streamer (801) having a first portion (808) and a second portion (810); the first portion (808) including both first pressure sensors (902) and pressure derivative sensors (904) for acquiring the seismic data; and the second portion (810) including second pressure sensors (902). The first portion (808) imparts ghost diversity to the seismic data by having a variable-depth profile and the pressure derivative sensors (904) impart polarity diversity to the seismic data.