Abstract:
A seismic data acquisition assembly includes a cable; seismic sensors that are disposed along the cable; and a filler material inside the cable. The filler includes a hydrocarbon-based liquid and an agent to cause the filler material to have a rheological property that is substantially different than a corresponding rheological property of the hydrocarbon-based liquid.
Abstract:
An apparatus includes a cable; and seismic sensors that are disposed in the cable. The apparatus also includes spacers that are distributed in the cable such that each seismic sensor is disposed in an interval of the cable separating a different adjacent pair of the spacers. The spacers of each pair are separated by at least twenty-five centimeters.
Abstract:
Discloses herein is a a system of acquiring seismic date in a marine environment, which includes: seismic streamers towed by a vessel; and means for detecting and/or locating marine mammals, characterised in that said marine mammal detection and/or location means are secured to said seismic streamers.
Abstract:
A cable connection for connecting a cable 9 to an underwater installation 7 comprises a connector (2, see FIG. 2) for connection to an end of the cable 9, the connector having at a first end engagement means for engaging with the installation 7, a tether (4, see FIG. 2) which in use has a first end attached to the connector and a second end attached to the cable at a distance from said end of the cable and guide means (12, 13, 14) located proximate a section of the cable adjacent said end of the cable so that in use said section is substantially restrained by said guide means at a predetermined angle with respect to the engagement means.
Abstract:
The invention relates to a method for production of an antenna section comprising a hydrophone (12) for a submarine antenna which may be composed of several antenna sections, whereby the hydrophones are arranged in a row one behind the other in a rectangular cavity (20) at a separation from each other on the inner wall of the cavity and the cavity is filled with a liquid gel (19) to fix the hydrophones, which thickens after introduction. According to the invention, the assembly procedure for the introduction and positioning of the hydrophones may be simplified whereby each hydrophone is inserted and fixed in the cavity with the longitudinal axis thereof essentially vertical, at a given separation from the previously inserted hydrophone, by means of a pipette (16). Liquid gel is then introduced into the cavity to such an amount that the liquid gel at least partly encloses the hydrophone held by the pipette. After the applied gel has thickened the pipette is withdrawn from the cavity for the insertion of another hydrophone, whereupon the method steps are repeated until the required number of hydrophones are inserted in the cavity.
Abstract:
An optical sensor cable includes at least one light source fiber extending substantially the entire length of the cable. A plurality of optical sensors are functionally coupled at an input thereof to the at least one light source fiber. At least one signal return fiber extends substantially along the entire length of the cable and is functionally coupled to an output of each of the optical sensors. The at least one source light fiber and the at least one signal return fiber are configured to be coupled at either end thereof to a respective one of a light source and a photodetection device.
Abstract:
A cable device wherein a signal-carrying cable is disposed within a flexible towing sleeve. The towing sleeve is made of a flexible, elongated sheet of abrasion-resistant material, into which is arranged a plurality of longitudinal, parallel pockets or sleeves. One or more elongated strain elements are arranged in the pockets such that one or more loops protrude at each end of the elongated sheet. The sheet is formed into a cylinder, in the interior of which is arranged the signal-carrying cable. A plurality of such cables may be connected in series to signal processing modules for use as seismic cables.
Abstract:
A seismic streamer includes a jacket covering an exterior of the streamer. At least one strength member extends along the length of the streamer and is disposed inside the jacket. At least one seismic sensor is disposed in a sensor spacer affixed to the at least one strength member. An encapsulant is disposed between the sensor and the sensor spacer. The encapsulant is a substantially solid material that is soluble upon contact with a void filling material. A void filling material is disposed in the interior of the jacket and fills substantially all void space therein. The void filling material is introduced to the interior of the jacket in liquid form and undergoing state change to substantially solid thereafter.
Abstract:
A seismic streamer includes a jacket and at least one seismic sensor disposed in a sensor holder inside the jacket. The at least one sensor is oriented inside the sensor holder such that a response of the at least one sensor is substantially longitudinally symmetric.
Abstract:
A streamer or cable for use in subterranean surveying includes a communications link, a plurality of network nodes interconnected by the communications link, where each of the plurality of network nodes is configured to perform a self-test to detect a fault condition of the corresponding network node, and bypass switches to bypass faulty one or more network nodes.