Abstract: A seismic streamer includes a sensor comprises an axially oriented body including a plurality of axially oriented channels arranged in opposing pairs; a plurality of hydrophones arranged in opposing pairs in the channels; a pair of orthogonally oriented acoustic particle motion sensors; and a tilt sensor adjacent or associated with the particle motion sensors. The streamer has a plurality of hydrophones, as previously described, aligned with a plurality of accelerometers which detect movement of the streamer in the horizontal and vertical directions, all coupled with a tilt sensor, so that the marine seismic system can detect whether a detected seismic signal is a reflection from a geologic structure beneath the streamer or a downward traveling reflection from the air/seawater interface.

Abstract: Method and apparatus for suppressing cable dynamics in a device towed in water. The apparatus includes at least one section for suppression of motion, wherein the at least one section includes an axial motion suppression section; and the axial motion suppression section comprising equipment for the attenuation of axial vibrations in an electro-mechanical cable. The equipment is configured to produce a digressive stiffness curve.

Abstract: A method of controlling a marine seismic streamer towed by a vessel includes deploying a workboat next to a section of the streamer and receiving, at the vessel, from the workboat, a command to enter a maintenance mode. In response, a locking command is transmitted via a streamer data link to direct a bird attached to the streamer to lock movable surfaces thereof. A user interface on the vessel is locked so that control of the bird is no longer available therethrough. A control apparatus for marine seismic operations includes the user interface, a receiver to receive commands from the workboat, a streamer interface to command the birds, a memory recording locations and identifiers of the birds, and a processor configured to carry out the method steps. A marine seismic detection system includes the streamer, a maintenance controller in the workboat, and an integrated navigation system controller in the vessel.

Abstract: A torque relief system dissipates a torque in a marine cable section to be used for seismic data collection. The system includes a bench having a deadman unit; a tensioning element connected to the deadman unit; a swivel bearing unit connected to the tensioning element and configured to receive a first end of the marine cable section; and at least one bearing unit configured to support the marine cable section with reduced friction so that when the tensioning element tenses the marine cable section, the marine cable section and the first end rotate freely until the torque is dissipated.

Abstract: Method and deployment device for a downhole tool. The device includes a body; a door rotatably attached to the body and configured to have an open position for allowing at least a portion of a fishing neck of the downhole tool to contact the body and a close position that secure the at least a portion of the fishing neck inside the deployment device; a bend restrictor attached to the body and configured to receive a logging cable of the downhole tool; and a locking mechanism for securing the door in the close position.

Abstract: The present invention concerns a method and a well string element for transmitting data in a well. The well string element (20c) includes an elongated body (80) that defines a through channel (110) and also includes a side pocket (92) that is open to ambient (91); and an acoustic modem (60) provided in the pocket (92) and configured to emit acoustic waves. The acoustic modem (60) is configured to receive electrical signals from one or more sensors (50, 52), transform the electrical signals into the acoustic waves and emit the acoustic waves into a wall (112) of the elongated body (80) when receiving an acoustic wake-up call from a device (70) outside the drill string element (20c).

Abstract: A vibrator truck includes a vehicle and a vibration assembly mobile relative to each other by a lift system having at least one footbase and configured to lift up/down the vibration assembly. The lift system includes at least one flexible strap and a coupling device configured to couple the at least one flexible strap to the vibratory part and the at least one footbase.

Abstract: There is a testing device for testing a sensor. The testing device includes a rotating mechanism; a first rotating plate connected to the rotating mechanism so that the first rotating plate rotates around an orbital axis (Z1); a second plate rotatably attached to the first rotating plate at a rotating point, the second plate having a rotational axis (Z2) offset from the orbital axis (Z1) by a predetermined distance R; and a gripping mechanism attached to the second plate and configured to receive and fix the sensor relative to the second plate. The second plate follows a circular trajectory with constant attitude around the orbital axis (Z1).

Abstract: A stress relief device is provided for a connector. The connector is connected to a cable and configured for cooperating with a complementary connector along a longitudinal axis. The stress relief device includes: an anchor configured for being placed around a portion of the cable so as to allow a stress relief of the portion of the cable, the portion of the cable being adjacent to the connector; a shell configured for being connected to the anchor and for at least partially wrapping the connector; and a locking system configured for connecting and locking the shell to a similar shell of a similar stress relief device for the complementary connector. The stress relief device is detachably mountable on the connector and is configured such that its mounting/dismounting does not require any change in the connection/disconnection of the connectors to one another.

Abstract: A method for estimating a position of a first acoustic linear antenna relative to a second acoustic linear antenna belonging to a network of towed acoustic linear antennas on which are arranged a plurality of nodes. The method includes: setting a first plurality of nodes arranged on the first antenna to act as sender nodes and a second plurality of nodes arranged on the second antenna to act as receiver nodes; forming a first group of sender nodes each sending a same first acoustic signature; for each receiver node: obtaining a propagation duration and establishing a geometrical figure representative of potential positions of a sender node, based on the propagation duration and the first acoustic signature; determining a set of common points between the geometrical figures; estimating the position of the first antenna relative to the second antenna based on the set of common points.

Abstract: A seismic survey is conducted by positioning an array of remote acquisition units (RAUs). Each of the RAUs records seismic data derived torn one or more geophones in digital form in local memory. The data is collected by a harvester unit traversed across the survey territory as by an aircraft using point-multipoint communications, and subsequently transferred from the harvester unit to a central control unit.

Abstract: A method for localizing a marine animal in an underwater environment implemented by a passive acoustic monitoring (PAM) system. The passive acoustic monitoring system includes network of acoustic sensors adapted to carry out measurements of acoustic signals. The method includes: obtaining, from the network of acoustic sensors, measured data of an acoustic signal emitted by a marine animal; defining a space of dimensional representation of the underwater environment discretized in a plurality of predefined cells, for each cell of a predefined set, obtaining an error defined as a value of a cost function for the cell, the cost function giving a deviation between: at least some of the measured data; and corresponding theoretical data obtained by assuming the marine animal is located in the cell, the errors obtained for the predefined set of cells enabling to obtain at least one piece of information about localization of the marine animal.

Abstract: It is proposed a method for collecting, in a collecting device distinct from a central unit, data coming from a plurality of seismic acquisition units. The method includes a step of assigning at least one device as a sink unit. For a given sink unit, the method also includes the following steps for data specific to at least one seismic acquisition unit not assigned as a sink unit: transmitting the specific data from the at least one seismic acquisition unit to the given sink unit, via a radio path established in a radio multi-hop network built at least with the given sink unit and the plurality of seismic acquisition units; and transmitting the specific data from the given sink unit to the collecting device, via a link.

Abstract: An operation managing system is provided for managing the operation of a navigation control device. The navigation control device is adapted for controlling the depth and/or the lateral position of a towed acoustic linear antenna and including a body to which is attached a set of wings. The operation managing system operates the navigation control device according to a degraded operating mode, by acting on at least one non-released and motorized wing when detecting that at least one wing of the set of wings has been released or must be released.

Abstract: A method for waking up a distant device from a local device, through a transmission medium and distant and local media converters. Initially, at least one of the physical and link layer units of the distant device is off, and its processing layer unit is off or in Low Power mode. The transceiver of the distant media converter is on. When receiving an initial wake-up signal from the local device, the transceiver of the distant media converter generates an electrical wake-up signal converted from the initial wake-up signal. The transceiver of the distant media converter sends the electrical wake-up signal, or derived wake-up information, to the processing layer unit of the distant device, through a transmission line independent of the physical and link layer units of the distant device. When receiving the electrical wake-up signal or the wake-up information, the processing layer unit of the distant device turns on.

Abstract: A method is provided for controlling quality of operation of a passive acoustic monitoring system. The method includes, at least for one given source: (a) the given source emits at least one acoustic test signal; (b) the passive acoustic monitoring system obtains acoustic signal measurements and estimates at least one parameter, characteristic of and/or associated with the at least one test acoustic signal, as a function of the acoustic signal measurements; (c) comparing the at least one estimated parameter with at least one reference parameter, characteristic of and/or associated with the at least one test acoustic signal; (d) obtaining at least one piece of quality information, as a function of results of the comparing step. A quality control device is provided, which drives the given source to trigger the step (a), obtains the at least one estimated parameter and carries out the steps (c) and (d).

Abstract: A digital seismic sensor adapted to be connected, via a two-conductor line, to an acquisition device. The digital seismic sensor includes: a digital sensor; a local sampling clock providing a sampling frequency; a receiver for receiving command data coming from the acquisition device and synchronization information providing accurate timing information to enable seismic sensor synchronization; a compensator for compensating, as a function of the synchronization information, a drift of the local sampling clock; a transmitter for transmitting seismic data towards the acquisition device; a driver for driving the receiver and the transmitter, according to a half-duplex transmission protocol over the two-conductor line and using a transmission clock extracted from the received command data; a power receiver for receiving electrical power; and a coupler for coupling the command and synchronization information receiver, the transmitter and the power receiver to the two-conductor line.

Abstract: Method and apparatus for collecting data. The apparatus for a motorless seismic tool includes a body; a motorless clamping mechanism connected to the body; and an anchoring arm attached to the body and the motorless clamping mechanism. The motorless clamping mechanism is configured to close or open the anchoring arm based on gravity.

Abstract: A hybrid sensing apparatus for collecting data. The apparatus includes an optical sensing component having an optical cable that acquires a first set of data and an electrical sensing component having sensor tools that acquires a second set of data. The electrical sensing component extends parallel to the optical cable for a first length (L1) and then antiparallel to the optical cable for a second length (L2), said sensor tools being located along the second length (L2) of the electrical sensing component.

Abstract: It is proposed a method for providing synchronization in a data acquisition system including a plurality of acquisition units. A given acquisition unit of the plurality carries out the following steps: receiving a packet from another device of the data acquisition system; extracting a synchronization accuracy information and a reference clock information from the received packet; obtaining a first reference clock as a function of the extracted reference clock information; if the extracted synchronization accuracy information indicates a better synchronization accuracy than a current synchronization accuracy information associated to the given acquisition unit: taking the obtained first reference clock as a selected reference clock and updating the current synchronization accuracy information to indicate a lower synchronization accuracy than the extracted synchronization accuracy information.