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A method for estimating a tilt angle (t) of at least one given particle motion sensor nearly collocated, in a multi-sensor streamer for seismic prospection, with a pressure sensor. The given particle motion sensor has two orthogonal sensing axes Y and Z in a plane orthogonal to a longitudinal axis of the streamer. The tilt angle is formed by the Z sensing axis and a reference vertical axis Z0. The method comprises, for the given particle motion sensor, a step of computing a first estimate _(0 )of the tilt angle, comprising, while the streamer is being towed: obtaining (41) first data measured by the pressure sensor nearly collocated with the given particle motion sensor; obtaining (42) second and third data measured by the given particle motion sensor along the sensing axes Y and Z respectively; for at least two values of a rotation angle , rotating (45) the second and third data by the rotation angle , to obtain rotated second and third data; and computing (46-410) a particular value _(max )among the at least two values of the rotation angle, which maximizes, over at least one frequency, a coherence function between the first data and the rotated third data, or between the first data and velocity data resulting from an integration of the rotated third data, the particular value _(max )being equal to said first estimate _(0). Step of computing a first estimate 0 of said tilt angle is processed independently of any seismic signal.


Patent
Sercel Inc. | Date: 2016-04-20

Method and down-hole tool for use inside a well, the down-hole tool including a housing; an anchoring arm rotatably attached to the housing and configured to move between an open position and a closed position; a spring block configured to have a central part that moves along a longitudinal axis of the housing which results in the movement of the anchoring arm between the open or closed positions; and an actuating mechanism connected to the central part and configured to move the central part along the longitudinal axis. The spring block is detachably attached to the housing.


Patent
Sercel Inc. | Date: 2016-09-26

A coupling device is provided for a sensor unit having at least one sensor located within a housing. The coupling device includes at least one supporting portion, wherein the supporting portion is configured for maintaining the sensor unit in a stable position, with the coupling device either resting on or being buried into the ground, and at least one rod, arranged in a plane which is essentially perpendicular to a peripheral surface of the supporting portion and linked to the supporting portion. The coupling device further includes a fastener for connecting the sensor unit to the coupling device. The supporting portion maintains the sensor unit in a stable position when resting on the ground, while the rod provides an additional stiffness to the housing.


A method for harvesting seismic data and generating seismic output files from the seismic data and corresponding source data. The method includes: positioning, in a survey area, data acquisition units associated with sensors; performing at least one seismic event using at least one seismic source; acquiring seismic data in the data acquisition units, the seismic data resulting from the at least one seismic event; deploying at least two data harvester units at fixed positions in the survey area. Each data harvester unit: harvests the seismic data; receives source data relating to the seismic event; generates a partial seismic output file from the harvested seismic data and the received source data; transmits the partial seismic output file to a central unit. The method also comprises generating, by the central unit, a final seismic output file from the partial seismic output files transmitted by the at least two data harvester units.


A method if provided for determining a sail path of at least one vessel on a map representative of a marine geographic area, to perform a turn between a start point and an end point. The start point is associated with a start circle, and the end point is associated with an end circle having a predefined radius of curvature. The sail path is curvilinear and composed of arc segments and straight segments. The method includes: detecting, in the map, obstacles likely to interfere with the at least one vessel; encompassing each obstacle into a curvilinear geometric form; determining a sail path of the given vessel by minimizing, under constraints, a cost function including: a first term representative of the length of arc segments making up the sail path and a second term representative of the length of straight segments making up the sail path, taking into account the start and end circles and the curvilinear geometric form into which is encompassed each obstacle.


A method is provided for determining a sail path of vessels on a map representative of a marine geographic area, to perform a turn between a start point and an end point, each vessel having a turn radius, the start point, respectively the end point, being associated with a start, respectively an end, circle, the sail path being curvilinear and composed of arcs and straight segments. The method includes: detecting obstacles likely to interfere with at least one vessel; encompassing obstacles into a curvilinear geometric form; determining a sail path of the vessel by minimizing, under constraints, a cost function comprising: a first term representative of the length of arcs making up the sail path and a second term representative of the length of straight segments making up the sail path, taking into account the start and end circles and the curvilinear geometric forms, and a third term of penalization of distance separating the sail path to be determined, at any point of the sail path, and at least one disturbing object.


It is proposed a method for determining a sail path of vessels on a map representative of a marine geographic area, to perform a turn between a start point and an end point, each vessel having a turn radius, the start point, respectively the end point, being associated with a start, respectively an end, circle, the sail path being curvilinear and composed of arcs and straight segments. The method comprises steps of: detecting (21) obstacles likely to interfere with at least one vessel; encompassing (23) obstacles into a curvilinear geometric form; determining (25) a sail path of the vessel by minimizing, under constraints, a cost function comprising: a first term representative of the length of arcs making up the sail path and a second term representative of the length of straight segments making up the sail path, taking into account the start and end circles and the curvilinear geometric forms, and a third term of penalization of distance separating the sail path to be determined, at any point of said sail path, and at least one disturbing object.


Patent
Sercel Inc. | Date: 2016-05-11

A seismic detection line includes one or more identified element(s) (112) arranged in a string, and a telemetry link (315) connecting the element(s) along the string to convey seismic data from at least one of the element(s) to a data recorder and identification data to a topology controller (210). Each of the element(s) includes a respective first identification unit (256) connected to the telemetry link to provide a respective first identifier to the topology controller. A seismic detection system also includes a processor that queries the identified element(s) for their respective identifiers, determines an arrangement of the seismic detection line using the received identifiers, and presents an indication of the determined arrangement. A method of operating a seismic detection line includes transmitting a query along the telemetry link, detecting whether the respective identifier of one of the element(s) was received or not, repeating until termination, and determining and indicating the arrangement.


Patent
Sercel Inc. | Date: 2016-03-09

A method and apparatus are provided for steering a first acoustic linear antenna belonging to a plurality of acoustic linear antennas towed by a vessel. A plurality of navigation control devices are arranged along the plurality of linear antennas in order to act at least laterally on the position of the linear antennas. At least one of the navigation control devices arranged along the first acoustic linear antenna performs steps of: obtaining a local measurement of a feather angle or of a parameter linked to the feather angle, the local measurement being associated with the at least one of the navigation control devices arranged along the first acoustic linear antenna; computing a lateral force, as a function of the obtained local measurement; and applying the computed lateral force.


A method is provided for transmitting signals on a multi-conductor cable (12) formed from a plurality of conductors (1-7) surrounded by an armor (10), the plurality of conductors having a central conductor (7) surrounded by a first peripheral layer of conductors (1-6) with an even number of conductors symmetrically arranged around the central conductor. The two following transmission modes are carried out simultaneously: a common mode (TX1) that uses the central conductor (7) with a return on the armor (10), for transmitting a first signal (s_(1)); and a differential mode (TX2) between a first path comprising all odd rank conductors (1,3,5) of the peripheral layer and a second path comprising all even rank conductors (2,4,6) of the peripheral layer, for transmitting a second signal (s_(2)).

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