Abstract:
An apparatus includes particle motion sensors and a streamer that contains the particle motion sensors. The streamer is to be towed in connection with a seismic survey, and the towing of the streamer produces a turbulent flow. The streamer includes an inner cable that contains the particle motion sensors and a fluid containing layer to surround the inner cable to reduce noise otherwise sensed by the particle motion sensors due to the turbulent flow.
Abstract:
A method and apparatus for a seismic cable is described. The apparatus includes a plurality of cable segments comprising at least a first cable segment and a second cable segment coupled by a connector. The connector comprises a cylindrical body having a first diameter, a portion of the body having a second diameter that is smaller than the first diameter and centrally positioned between opposing ends of the body, a first coupling section having a terminating end of the first cable segment anchored therein, and a second coupling section having a terminating end of the second cable segment anchored therein, at least a portion of the first and second coupling sections being rotatably coupled to respective ends of the body, wherein the connector isolates the first cable segment from the second cable segment. A method of deployment and retrieval of the seismic cable is also described.
Abstract:
A marine seismic system having a tow vessel; a first tow member connected to the tow vessel; a second tow member connected to the tow vessel; a first distance member having a first end connected to the first tow member and a second end connected to the second tow member; and a first attachment device connecting the first end to the first tow member, the first attachment member operational between an engaged position securing the first end of the distance member in a fixed position relative to the first tow member and a disengaged position permitting the first attachment device to move along a portion of the first tow member.
Abstract:
A method includes recording a first set of data using a first type of sensor; recording a second set of data using a second type of sensor, the first and second sets of data being contemporaneously acquired by co-located sensors; and removing noise from the first data set using the second data set. An apparatus includes a survey vessel towing an array of towed streamers including a plurality of paired, co-located sensors densely distributed along the streamers. A first one of each sensor pair is of a first type and a second one of each sensor pair is of a second type. A computing apparatus records a first set of data acquire by the first type of sensor and a second data set acquire by the second type of sensor. The computing apparatus then removes noise from the first data set using the second data set.
Abstract:
A method includes recording a first set of data using a first type of sensor; recording a second set of data using a second type of sensor, the first and second sets of data being contemporaneously acquired by co-located sensors; and removing noise from the first data set using the second data set. An apparatus includes a survey vessel towing an array of towed streamers including a plurality of paired, co-located sensors densely distributed along the streamers. A first one of each sensor pair is of a first type and a second one of each sensor pair is of a second type. A computing apparatus records a first set of data acquire by the first type of sensor and a second data set acquire by the second type of sensor. The computing apparatus then removes noise from the first data set using the second data set.
Abstract:
La présente invention concerne la réalisation d'un sonar passif remorqué à antenne multifaisceaux. Ce dispositif passif est notamment destiné à la lutte anti sous-marine. Le dispositif selon l'invention comporte notamment une antenne multifaisceaux, un câble électrotracteur et des moyens de traitement du signal. L'antenne multifaisceaux est constituée d'éléments réalisés sous forme de plaques de polyuréthane dans lesquelles sont inclus des capteurs acoustiques arrangés en réseaux. Chaque capteur est relié aux moyens de traitement du signal de manière indépendante des autres capteurs. L'antenne comporte en outre un capteur de position permettant de connaître son attitude et son orientation dans le milieu dans lequel elle est tractée. Les signaux reçus par les capteurs étant acheminés séparément vers les moyens de traitement du signal, le dispositif selon l'invention permet de réaliser une formation adaptative de faisceaux d'écoute, ou voies, pouvant être orientés dans toutes les directions autour de l'antenne, la direction de chacun des faisceaux pouvant être connue quelle que soit l'orientation et l'attitude de l'antenne. L'antenne est tractée par le navire porteur au moyen d'un câble électrotracteur qui assure la liaison électrique et mécanique entre l'antenne et les équipements situés sur le bâtiment remorqueur. Le dispositif selon l'invention présente l'avantage d'avoir des performances comparables aux sonars passifs équipés d'antennes linéaires pour une masse et un encombrement sensiblement plus faibles.
Abstract:
A seismic cable (110) and a method for assembling such a seismic cable are disclosed. The seismic cable (110) includes a support cable (205) and a signal cable (210) attached to the support cable (205) at a plurality of points spaced along the length of the signal cable (210). The seismic cable (110) also includes at least one sensor module (220) disposed on the signal cable (210). The method includes attaching a support cable (205) to a signal cable (210) at a plurality of points spaced along the length thereof.
Abstract:
An array of fiber optic hydrophones or geophones is formed by winding of optical fiber around a continuous, yet flexible cylindrical core. The cylindrical core contains an elastomer filled with a specified percentage of voided plastic microspheres. The elastomer provides the necessary radial support of the optical fiber, and with the included voided microspheres, provides sufficient radial compliance under acoustic pressure for proper operation of the hydrophone. The cylindrical core can be made in very long sections allowing a plurality of fiber optic hydrophones to be wound onto it using a single optical fiber, with individual hydrophone elements separated by integral reflectors such as Fiber Bragg Gratings (FBSs). The center of the core may include a strength member and a central hollow tube for the passing of additional optical fibers. The aforementioned hydrophone array is then packaged within a protective outer coating or coatings as required for the specified application.
Abstract:
The housing (1) includes a body (2) defining a cavity (3) intermediate a first end (4) and a second end (5). A removable connector (6) is releasably engageable with the first end (4) and a fixed connector is being fixedly disposed on the second end (5). The removable and fixed connectors are each being adapted for connection to a cable. One application of the housing is its use as a connector for submersable cables.
Abstract:
A seismic ocean bottom cable array is provided for use in subsurface exploration. The array includes receiver stations for measuring seismic signals, and a cable including conductors for data transmission and an externally attached stress member. The array is assembled during deployment by attaching the data transmission cables and receiver stations to the stress member as it is lowered into the water.