• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electromagnetic sensor cable (18D) has cable components including a first sensor cable segment (18B) having a plurality of electrodes (24) spaced apart on the first sensor cable segment (18B) and connected electrical conductors to the electrodes (24) such that at least one of the electrodes (24) can be electrically connected to at least one longitudinal end of the first sensor cable segment (18B). The sensor cable includes a second sensor cable segment configured substantially in the same manner as the first sensor cable segment (18B). A first signal processing and configuration module (18C) has a signal processing circuit configured to perform at least one voltage measurement across the selected pairs of electrodes (24), and to provide signals representative of the voltages measured at the terminals of the selected pairs of electrodes (24). terminals of the selected pairs of electrodes (24). The cable components are each configured to connect to the lateral ends of each other.
    公开号:FR3054923A1
    申请号:FR1757530
    申请日:2017-08-04
    公开日:2018-02-09
    发明作者:Peter Lindqvist Ulf；Robert Juhasz Andras；Goran Mattias Sudow Gustav
    申请人:PGS Geophysical AS；
    IPC主号:
    专利说明:

    Holder (s): PGS GEOPHYSICAL AS.
    Agent (s): CABINET BEAU DE LOMENIE.
    ELECTROMAGNETIC SENSOR CABLE AND ELECTRICAL CONFIGURATION THEREOF.
    FR 3 054 923 - A1
    An electromagnetic sensor cable (18D) has cable components comprising a first sensor cable segment (18B) having a plurality of electrodes (24) spaced apart on the first sensor cable segment (18B) and connected electrical conductors to the electrodes (24) such that at least one of the electrodes (24) can be electrically connected to at least one longitudinal end of the first segment of sensor cable (18B). The sensor cable includes a second sensor cable segment configured in substantially the same manner as the first sensor cable segment (18B). A first signal processing and configuration module (18C) has a signal processing circuit configured to perform at least one voltage measurement across the selected pairs of electrodes (24), and to communicate signals representative of the measured voltages to the terminals of selected pairs of electrodes (24). The cable components are each configured to connect to the side ends of each other.

    The invention relates generally to the field of marine electromagnetic research of rock formations below the surface. More specifically, the invention relates to electrical configurations for electromagnetic sensor cables used in such research.
    Marine electromagnetic geophysical research is used to obtain a spatial distribution of electrical conductivity of rock formations under the bottom of a body of water such as a lake or an ocean. The spatial conductivity distribution is used to help determine the presence of hydrocarbon bearing rock formations in the subsurface. One type of such research generally includes inducing an electromagnetic field ("EM") that varies over time in subsurface formations and measuring one or more parameters related to a response of subsurface rock formations to the induced electromagnetic field.
    Devices for inducing these electromagnetic fields are generally referred to as "sources" or "emitters" and include, among other devices, spaced electrodes disposed along or at the ends of a cable. The cable can be towed by a vessel through the body of water. An electric current which varies over time is applied to the electrodes, generally from a supply located on the ship, in order to induce an electromagnetic field which varies over time in the water and then in the formations below the surface. The electrodes can be suspended to a selected depth in the water using flotation devices such as buoys, or the cable itself can be of neutral flotation or otherwise float.
    The response of formations below the surface below the bottom of the water can be detected by different sensors on long cables or "streamers" towed into the water behind the research vessel or a different vessel. In some examples, the streamer includes pairs of spaced electrodes for detecting an electric field component of the electromagnetic field response.
    The direct electromagnetic field strength decreases rapidly relative to the distance from the electromagnetic field source in an electromagnetic measurement system. The corresponding electromagnetic field modulated by the rock formations below the surface decreases even more rapidly with respect to the distance from the emitter or the field source. When pairs of electrodes are used to detect the electric field component of the electromagnetic field, these pairs must have a short separation between the elements of the pair when the pair is placed close to the source so as not to saturate an amplifier. input typically associated with the electrode pair. At long distances (“offsets”) from the source, the electrodes in respective pairs must be separated by a greater distance in order to be able to measure the weaker electric field component.
    Sea streamers are typically assembled from segments each about 75 meters long, and may include a number of such segments interconnected so that the total length of sea streamer can be several kilometers. Pairs of "short" electrodes can typically be mounted in a standard geophysical streamer segment length of 75 m, while lengths of larger electrode pairs can be many times longer than the length of a typical marine flute segment. The spacing requirements for pairs of low offset and large offset electrodes are therefore contradictory to the design of a single marine streamer wiring configuration.
    What is required is a wiring configuration which can be used in a sensor streamer having selectable spacing between respective pairs of electrodes.
    To this end, the present invention provides in a first aspect an electromagnetic sensor cable which comprises as cable components a first segment of sensor cable itself comprising a plurality of spaced electrodes on the first segment of sensor cable and electrical conductors connected to the electrodes so that at least one of the electrodes can be electrically connected to at least one longitudinal end of the first sensor cable segment, a second sensor cable segment configured in substantially the same manner as the first segment sensor cable, and a first signal processing and configuration module having a signal processing circuit configured to perform at least one of a voltage measurement across selected pairs of electrodes and a signal communication representative of the voltages measured across the selected pairs of electrodes, the com cable posers being each configured to connect to the lateral ends of each other.
    According to this first aspect, at least one of the sensor cable segments may further comprise a wire extending from a longitudinal end to the other longitudinal end of the sensor cable segment without connection to an electrode. The electromagnetic sensor cable may further include as cable components a first segment of wire passage cable having electrical conductors extending from one longitudinal end to the other. It may also include at least one additional component chosen from the group consisting of a sensor cable segment configured substantially in the same way as the first sensor cable segment, of a wire passage cable segment configured substantially in the same manner as the first wire passage cable segment, and a signal processing and configuration module configured in substantially the same manner as the first signal processing and configuration module.
    The cable components can be connected at the side ends such that the number of cable components between the sensor cable segments gradually increases from a first end of the electromagnetic sensor cable to a second end of the electromagnetic sensor cable. Furthermore, the connection between the cable components can provide electrical connectivity between the electrical conductors of the sensor cable segments, the electrical conductors of the first wire passage cable segment, and the signal processing circuit of the first cable module. signal processing and configuration.
    The signal processing and configuration module may have a configuration plug which can be electrically configured to electrically connect at least two electrodes to the signal processing circuit. The signal processing and configuration module may also include a low noise amplifier in signal communication with the configuration plug, an analog-to-digital converter and an electrical-optical converter in electrical connection with the low noise amplifier.
    The first wire passage cable segment can provide electrical connections between a first cable component connected to a first side end of the first wire passage cable segment and a second cable component connected to a second side end of the first segment of wire passage cable so that the electrical passages are identical as if the first and second cable components are directly connected to each other.
    In addition, the electromagnetic sensor cable may include a tow cable configured to connect to a research vessel. It may also include a connector pinout of electrode leads and leads connected in connectors configured to connect the sensor cable segments and / or signal processing modules such that a single cable section configuration sensor can be used to access different electrodes on it according to a number of sensor cable sections connected between the successive signal processing and acquisition modules.
    Finally, in the electromagnetic sensor cable according to the first aspect, the first sensor cable segment may comprise a wire extending from a longitudinal end to the other longitudinal end of the first sensor cable segment without connection to a electrode, and the first wire pass cable segment may be configured in substantially the same manner as the first sensor cable segment, but the electrical conductors connected to the electrodes of the first wire pass cable segment may be overlooked.
    In a second aspect, the present invention provides an electromagnetic sensor cable which comprises as cable components a number N of sensor cable segments directly connected to each other at the lateral ends, each sensor cable segment comprising a number Q of spaced electrodes on the sensor cable segment, a number M of wires extending from one longitudinal end to the other longitudinal end of the sensor cable segment without connection to an electrode, and a WM number of electrical conductors in the sensor cable segment connected to the electrodes so that at least one of the electrodes can be electrically connected to at least one longitudinal end of the sensor cable segment, the numbers being linked to one other by the relation:
    W = (Q / 2 + M) = (Q / 2 + Q ’(N - l) / 2).
    In a third aspect, the present invention provides an electromagnetic research system comprising a research vessel, a tow cable connected at one end to the research vessel and an electromagnetic sensor cable as defined above.
    Finally, in a fourth aspect, the present invention provides a method of performing an electromagnetic search which comprises towing an electromagnetic sensor cable in a body of water with a research vessel, a tow cable being connected to a first end to the research vessel, and the electromagnetic sensor cable being as defined above.
    Furthermore, the method can include the fact of measuring a voltage across a selected pair of electrodes, and communicating a signal representative of the voltage across the selected pairs of electrodes. It may also include using the signal to deduce a spatial distribution of the electrical conductivity of the rock formations below the body of water.
    The present invention will be better understood on reading the following detailed description, given in conjunction with the appended drawings, in which:
    FIG. 1 shows an exemplary embodiment of an electromagnetic research system comprising a possible embodiment of an electromagnetic sensor cable according to the invention.
    FIG. 2A shows an exemplary embodiment of sensor cable segments comprising electrodes and wiring.
    FIG. 2B shows another exemplary embodiment of sensor cable segments comprising electrodes and wiring.
    FIG. 2C shows another exemplary embodiment of sensor cable segments comprising electrodes and wiring.
    Figure 3 shows an exemplary embodiment of a cable segment.
    FIG. 4 shows an exemplary embodiment of a configuration module.
    An exemplary embodiment of an electromagnetic research system comprising a possible embodiment of an electromagnetic sensor cable according to the invention is shown diagrammatically in FIG. 1. The research system may comprise a research vessel 10 which is moving along the surface of a body of water 11 such as a lake or an ocean. The vessel 10 may include equipment, represented generally at 12 and called for practical reasons "recording system". The recording system 12 can comprise (nothing is shown separately for the clarity of the illustration) equipment for navigating the ship 10, for activating an electromagnetic field source (explained below) at selected times and to record signals detected by one or more electromagnetic sensors or receivers (explained below).
    In the present embodiment, the electromagnetic field source may be a bipolar electrode 16 disposed at the rear end (relative to the towing direction) of a towing cable 14. A source of electric current (not shown) in the recording system 12 can activate the bipolar electrode 16 at selected times in order to introduce a time-varying electromagnetic field into the water 11 and into the formations 22 below the bottom of the water 20. Signals modulated by formations 22, among other signals, can be detected by electromagnetic sensors or receivers arranged on one or more 18D electromagnetic sensor cables.
    In the present embodiment, the electromagnetic sensor cable 18D includes a plurality of cable components, such as sensor cable segments 18B, which may each include a plurality of longitudinally spaced electrodes 24. Selected pairs of electrodes 24 may be electrically connected to the input of a voltage measuring circuit (further explained below) so that the amplitude of the electric field component of the induced electromagnetic field can be measured at a plurality of longitudinal distances ("offsets ”) Of the electromagnetic field source (bipolar electrode 16). As will be explained further, the two electrodes making up the selected pair may be on the same sensor cable segment 18B, or they may each be on a different sensor cable segment 18B. The sensor cable segments 18B can be combined with other components, to be further explained below, to form an electromagnetic sensor cable 18D.
    In some embodiments, the electromagnetic research system may include multiple 18D electromagnetic sensor cables, laterally spaced, and generally parallel to each other. Often, the 18D electromagnetic sensor cables are towed by the ship 10. However, one or more 18D electromagnetic sensor cables can be towed by another research vessel (not shown). In some embodiments, one or more electromagnetic sensor cables 18D may be located on the bottom of the water 20, rather than being towed by the vessel 10 or another vessel (not shown).
    An exemplary embodiment of an 18D electromagnetic sensor cable may include a tow cable 18, configured to be connected to the vessel 10 and tow the cable components of the 18D electromagnetic sensor cable. The cable components of the electromagnetic sensor cable 18D may include one or more segments of sensor cable 18B as explained above, and one or more segments of wire passage cable 18A. A wire passage cable segment 18A is essentially a sensor cable segment 18B without electrodes, having only one wiring extending from one longitudinal end to the other. In some embodiments, a sensor cable segment 18B can be used to function as a wire passage cable segment 18A, in which electrical connections to the electrodes are ignored (e.g. not electrically connected to the rest of the system) . The 18D electromagnetic sensor cable may also include one or more 18C signal processing and configuration modules. These signal processing and configuration modules 18C may include a signal processing circuit (explained further below) in order to measure voltages across selected pairs of electrodes 24 and communicate signals representative of the voltages measured to the system of recording 12. The rear end (with respect to the towing direction) of the electromagnetic sensor cable 18D can be terminated by a plug 19 in order to prevent water from entering electrical / mechanical terminations 30 which can be used to couple the different streamer cable segments (e.g. sensor cable segments 18B, wire passage cable segments 18A and signal processing and configuration modules 18C).
    As can be appreciated by those skilled in the art, the amplitude of the direct electric field decreases rapidly (of the order of 1 / r 2 to 1 / r 3 ) from a current dipole relative to the offset distance, r, of the current dipole (for example bipolar electrodes 16) in an electromagnetic measurement system. The amplitude of the corresponding modulated electromagnetic field decreases even more rapidly (of the order of 1 / r 5 to 1 / r 6 ) compared to the offset of the source position of the electromagnetic field. Pairs of electrodes used to detect the electromagnetic field, i.e. those of the electrodes 24 connected to the input of a voltage measurement circuit, must generally have a shorter separation between them when they are arranged near the source of the electromagnetic field (for example the bipolar electrodes 16) in order to avoid saturating the voltage measurement circuit (described below). For longer shifts in the electromagnetic field source, the electrodes in the respective sense electrode pairs must generally be spaced further apart from one another in order to be able to detect a measurable voltage in the presence of the relatively weak modulated electric field. . Shorter electrode pair distances can be obtained using only electrodes arranged in a "standard" streamer cable segment length of about 75 meters (for example one of the sensor cable segments 18B), then that the longer spaced electrode pairs can be spaced at distances which require electrical interconnection of the electrodes through multiple segments of sensor cable 18B, if the electromagnetic sensor cable 18D is assembled from segments. The various embodiments of an 18D electromagnetic sensor cable according to the invention can provide a high degree of flexibility by configuring an 18D electromagnetic sensor cable in order to be able to measure components of near and far offset electromagnetic field while using streamer cable segments and auxiliary cable components manufactured in only a limited number of configurations. For example, a possible configuration of an electromagnetic sensor cable would align the components as follows:
    BCBCBCBCB ... BACABACABACAB ... BAACAABAACAABAACAAB ...
    where "B" indicates the sensor cable segments 18B, "C" indicates the signal processing and configuration modules 18C, and "A" indicates the wire passage cable segments 18A.
    An exemplary embodiment of two of the sensor cable segments 18B is shown diagrammatically in FIG. 2. The sensor cable segments 18B, two of which are shown adjacent to each other, may comprise a plurality of electrodes 24 arranged in spaced locations along the outside of the sensor cable segments 18B. The internal structure of the sensor cable segments 18B and the electrodes 24 can be of any shape suitable for towing in water (11 in Figure 1) or a provision on the bottom of the water (20 in Figure 1). In the present embodiment, a selected number, for example two, of the electrodes 24 may be electrically wired inside the sensor cable segments 18B in order to have electrical connection capability (e.g. electrical connections 24A, 24B) at the front end F (relative to the towing direction) of section N of the sensor cable segment 18B. The same number or a different number, for example two, of other electrodes 24 can be electrically wired inside the sensor cable segments 18B in order to have the capacity of electrical connection (for example the electrical connections 24C, 24D ) at the rear end A (relative to the towing direction) of section N + 1 of the sensor cable segment 18B. A plurality of wires 26 can extend inside the sensor cable segments 18B from the front end F to the rear end A in order to have an electrical connection available for other electrodes in segments adjacent sensor cables 18B, for wires in wire passage cable segments (explained with reference to 18A in Figure 3) or for different circuits in one or more of the signal processing and configuration modules (18C in Figure 4).
    In the present embodiment, there may be 4 electrodes per sensor cable segment 18B as shown, although the number of electrodes on each sensor cable segment 18B is not a limit on the scope of the present invention. Flexibility in changing the offset and electrode spacing for any pair of electrodes (where the "pair" refers to two electrodes connected to the input of a voltage measurement circuit) can be implemented by wiring the sensor cable segments 18B as well as a set of wires 26 in a change pattern shown in Figures 2A to 2C such that electrical connection to the electrodes in segments of flute cable adjacent marine can be made.
    In different embodiments, by adding a number M of electrical conductor wires which pass directly through the sensor cable segment 18B, a 2M / Q number of additional sensor cable segments 18B can be connected in series without any modules additional or other interconnection between the connected sensor cable segments 18B. In the above, Q represents the number of electrodes on each segment of sensor cable 18B. In the embodiment of Figures 2A to 2C, six wires 26 are added to the wiring diagram allowing up to four segments of sensor cable 18B to be connected in series without any other type of interconnection between segments of adjacent sensor cable 18B. Other numbers of electrodes on each sensor cable segment 18B and other numbers of wires 26 can provide different numbers of sensor cable segments 18B that can be directly connected.
    A set of example configurations can be as follows. The number of electrodes can be represented by Q (where Q is an even number); the maximum number of sections to be connected without any form of interconnection module can be represented by N; the number of wires directly across can be represented by M; and the total number of wires in each sensor cable can be represented by W, so:
    W = (Q / 2 + M) = (Q / 2 + Q- (N - 1) / 2), and a wiring diagram is possible (q represents a connection to an electrode, m represents a connection to the wire):
    Brooch Connector 1 Connector 2 1 q (i) m (l) 2 q (2) m (2) Q / 2 q (Q / 2) m (Q / 2) Q / 2 + 1 m (l) m (Q / 2 + 1) M + Q / 2 - 1 m (M) q (Q / 2 + 1) M + Q / 2 m (M) q (Q)
    The main feature of the above wiring diagram is that electrodes can be electrically connected from each longitudinal end of the wire passage cable segment 18A, with up to N sensor cable segments 18B to form a balanced pair, c that is, the electrode spacings in any pair are equal. The number of balanced pairs available for selection is then NQ / 2.
    Another feature of the wiring diagram is to provide a connector "pinout" of the connected electrode wires and wires in the connector so that a single section configuration can be used to access different electrodes, depending on the number of sections that are connected together between each acquisition module. The pinout is intended to mean that each connector pin in the streamer section connector is characterized by connection to an electrode in a streamer section or to a dedicated wire provided for connection to a specific electrode in a section of adjacent flute. FIG. 2B illustrates an exemplary embodiment of the preceding concept, where the cable sections are represented in A and B, and the modules are represented in M3, Ml and M2.
    In the embodiment shown in Figure 2B, only one type of cable section can be used. If a cable section (A, B) is present between each module (Ml, M2, M3) as shown in Figure 2B, the electrodes Al and B2 are electrically connected to the adjacent module, for example Ml (and B1 available in adjacent modules M2, and A2 in M3).
    As shown in Figure 2C, if two cable sections are connected between successive modules, more electrodes will be available for electrical connection with the respective modules. In FIG. 2C, the module M1 has the electrodes Al, Cl, B2 and D2 electrically connected. The electrodes B1 and DI can be connected to the module M2. The electrodes A2 and C2 can be connected to the module M3.
    Thus, the wire rotation scheme in the connector allows flexible electrode and module wiring depending on the number of cable sections that are present between each module. The wire rotation pattern can be extended to support more than one electrode in each direction (up, down) in the section. The maximum number of sections between successive modules using such a scheme is equal to the number of wires plus one. This number is three in the example shown in Figures 2B and 2C.
    In the two figures 2B and 2C, a vertical position corresponds to a certain pin number in the connector. For example, assume that pins 1 through 6 in each connector are present between the cable sections and the modules.
    As previously explained, it is sometimes necessary to increase the offset and / or spacing between the electrodes in a pair in order to measure components of the electromagnetic field at certain distances from the electromagnetic field source. To increase the spacing between the electrodes in certain parts of an electromagnetic sensor cable, wire passage cable segments can be used. An embodiment of a wire passage cable segment 18A is shown in Figure 3. The wire passage cable segment 18A may include an outer plastic sheath 40 which may be made of polyurethane or the like . Each longitudinal end of the wire passage cable segment 18A can comprise a mechanical and electrical / mechanical termination 30 of types well known in the art for connecting marine flute cable segments. These electrical / mechanical terminations 30 can sealingly engage the inner surface of the sheath 40 and ensure mechanical coupling with at least one reinforcing element 42 which extends over the length of the segment of wire passage cable 18A and can communicate the axial towing load along the electromagnetic sensor cable (18D in figure 1). For example, the reinforcing element 42 can be made from a natural or synthetic fiber cord, using a material well known in the art for making marine flute reinforcing elements. Each electrical / mechanical termination 30 may include a plurality of electrical connectors 46 and / or optical connectors 46A. In the case of electrical connectors 46, there may be one connector for each wire 26. In the present embodiment, the wires 26 may be in the form of twisted pairs to reduce crosstalk and other electrical interference with signals applied to the wires 26. The wire passage cable segment 18A may also include one or more optical fibers 47 extending end to end inside the sheath 40 and terminated with suitable optical connectors 46A forming a part of the electrical / mechanical termination 30. The interior of the sheath 40 may include one or more buoyancy spacers 44 disposed in selected longitudinal positions. Buoyancy spacers can be made, for example, of polypropylene foam and can provide the wire passage cable segment 18A with selected overall buoyancy. Voids within the sheath can be filled with a buoyancy void filler (BVF) 48 of any type known to be used, for example, in the manufacture of seismic streamers. In one embodiment, the BVF 48 material can be introduced inside the sheath in liquid form and can then undergo a change of state into a gel. The above mechanical components, including the sheath 40, the BVF material 48, the buoyancy spacers 44, the reinforcing element 42 and the electrical / mechanical termination 30 can also be used in different embodiments of the sensor cable segment ( explained above with reference to 18B in Figures 2A to 2C). The preceding elements have been omitted from FIGS. 2A to 2C simply for the clarity of the illustration and not to limit the structures for the electromagnetic sensor cable compatible with the scope of the present invention.
    An exemplary embodiment of a signal processing and configuration module 18C is shown in a cutaway view in FIG. 4. The signal processing and configuration module 18C can be enclosed in a pressure-resistant housing 31 which can be made of high-strength plastic or non-magnetic alloy steel. The housing 31 may be of substantially cylindrical shape, and may include electrical / mechanical terminations 30 configured to connect to the terminations on the sensor cable segment (18B in Figure 1) or the wire passage cable segment (18A in figure 1). The embodiment shown in Figure 4 can provide this connection between the cable segments by including a flange 34 on the outside of the housing which engages a corresponding flange (not shown) in a connection sleeve 33. The connection sleeve 33 may be of substantially cylindrical shape and, when moved along the outside of the housing 31, may engage O-rings 35 or similar seal elements positioned longitudinally on either side of an opening 32 in the wall of the housing 31. Thus, with the sleeve 33 removed, the opening 32 is accessible. With the sleeve 33 in the connected position, for example by engaging internal threads 33A on the end of the sleeve 33 with corresponding threads 30A on the adjacent electrical / mechanical termination 30, the interior of the housing 31 is protected against the entry of through the sleeve 33.
    The interior of the housing 31 may include circuits for the selective interconnection of the wires (for example 26 in FIGS. 2A to 2C and 3) and electrical connections (for example 24A, 24B, 24C, 24D in FIGS. 2A to 2C ) from electrodes (24 in Figures 2A to 2C) on the sensor cable segment (18B in Figures 2A to 2C) to wires or voltage detection / measurement circuits. In the present embodiment, each of the electrical connections 46 to each electrical / mechanical termination 30 may be electrically connected, for example by pairs of twisted wires, to a corresponding electrical contact on a configuration plug receptacle 36. Others electrical contacts on the configuration plug receptacle 36 can be connected to the input terminals of one or more combinations of low noise amplifier / digitizer (AFB / CAN) 37. The output of the AFB / CAN combinations 37 can be connected to an optical optical signal converter (CEO) 38 and thence to one or more optical fibers 47 for the transmission of digitized voltage signals along the streamer and, if necessary, to the recording system (12 in Figure 1 ). The power supply for the AFB / CAN 37 and CEO 38 combinations can be delivered by a battery (not shown) inside the signal processing and configuration module 18C. This battery can be rechargeable when the streamer is deployed using a module charging circuit as described in US Patent No. 7,602,191 issued to the name of Davidsson.
    Returning to Figure 1, the particular electrodes 24 on any sensor cable segment 18B that are connected to the wires or to the input of the AFB / CAN combination (37 in Figure 4) can be chosen before deployment of the 18D electromagnetic sensor cable by inserting an appropriately wired configuration plug (36A in Figure 4) into the receptacle (36 in Figure 4). Thus, in combination, appropriate numbers of sensor cable segments 18B, wire passage cable segments 18A, and appropriately configured signal processing and configuration modules 18C can provide the system user with large number of options for electrode spacing and offset while manufacturing only three basic components. It should be noted that the signal processing and configuration module 18C can be used to select electrodes 24 on segments of sensor cable 18B located both remotely (away from ship 10) and forward ( to ship 10) from the signal processing and configuration module 18C along the electromagnetic sensor cable 18D.
    For example, in the embodiment explained with reference to Figures 2A to 2C, a number N of sensor cable segments each having a number Q of electrodes and a number M of wires can be connected in series. One of the signal processing and configuration modules 18C can be arranged at the distal end (away from the vessel 10) of the N interconnected sensor cable segments 18B. Configuration sheet 36A can be arranged such that all electrical connections to the electrodes extending in a direction away from the ship
    10 can be inverted in the signal processing and configuration module
    18C, thereby making all of the electrical connections to each electrode available at the forward end (F in Figures 2A to 2C) of the most forward interconnected sensor cable segment 18B (to ship 10). Other configurations of sensor cable segments 18B, wire passage cable segments 18A, and signal processing and configuration modules 18C will be apparent to those skilled in the art to provide a wide range of electrode gaps and offsets along the assembled electromagnetic sensor cable (18D in Figure 1).
    Although the invention has been described with a limited number of embodiments, those skilled in the art, benefiting from this disclosure, will appreciate that other embodiments can be devised without departing from the scope of the invention.
    权利要求:
    Claims (20)
    [1" id="c-fr-0001]
    1. Electromagnetic sensor cable, comprising:
    sensor cable segments, wherein each of the sensor cable segments includes a plurality of spaced electrodes; and one or more signal processing and configuration module (s) for measuring voltages across selected pairs of electrodes, in which the selected pairs of electrodes are on different segments of cable sensor to obtain pairs of electrodes with longer spacing than distances of pairs of electrodes obtained by using only electrodes arranged on the same segment of sensor cable.
    [2" id="c-fr-0002]
    2. The electromagnetic sensor cable according to claim 1, wherein a selected number of electrodes on the sensor cable segments are wired in order to have electrical connection capability at a rear end of the particular cable segment relative to a towing direction.
    [3" id="c-fr-0003]
    The electromagnetic sensor cable according to claim 2, wherein a selected number of the electrodes on the sensor cable segments is wired in order to have electrical connection capability at a front end of the particular cable segment with respect to a direction of towing.
    [4" id="c-fr-0004]
    The electromagnetic sensor cable according to claim 3, wherein a plurality of wire passage cables extend within the sensor cable segments from the front end to the rear end.
    [5" id="c-fr-0005]
    The electromagnetic sensor cable according to claim 4, wherein the plurality of wire passage cables have electrical connection to the electrodes on adjacent segments of sensor cable.
    [6" id="c-fr-0006]
    The electromagnetic sensor cable according to claim 1, further comprising a connector pinout of connected electrode wires and wire passage cables in connectors configured to connect segments of sensor cable and / or processing modules. signal, so that a single section of sensor cable configuration can be used to access different electrodes therein, depending on a number of sensor cable sections connected to each other between successive modules of signal processing and acquisition.
    [7" id="c-fr-0007]
    7. The electromagnetic sensor cable according to claim 1, in which the signal processing and configuration module (s) is or are further configured to measure voltages at the terminals of selected pairs of electrodes on the same sensor cable segment.
    [8" id="c-fr-0008]
    8. The electromagnetic sensor cable according to claim 1, in which the signal processing and configuration module (s) is or are further configured to communicate signals representative of voltages measured at the terminals of the selected electrodes. .
    [9" id="c-fr-0009]
    9. The electromagnetic sensor cable according to claim 1, in which the signal processing and configuration module (s) comprises (s) a configuration plug which can be electrically configured to electrically connect at least two electrodes to signal processing circuits.
    [10" id="c-fr-0010]
    10. The electromagnetic sensor cable according to claim 9, in which the signal processing and configuration module (s) comprises or comprise a low noise amplifier in signal communication with the configuration plug, an analog converter. digital and an electrical-optical converter in electrical connection with the low noise amplifier.
    [11" id="c-fr-0011]
    11. The electromagnetic sensor cable according to claim 1, further comprising a segment of wire passage cable comprising electrical conductors extending from one longitudinal end to the other, without connection to an electrode.
    [12" id="c-fr-0012]
    12. Electromagnetic research system comprising: an electromagnetic sensor cable comprising:
    sensor cable segments, wherein each of the sensor cable segments includes a plurality of spaced electrodes; and one or more signal processing and configuration module (s) for measuring voltages at selected pairs of electrodes, in which the selected pairs of electrodes are on different segments of sensor cable for obtaining pairs of electrodes with spacing longer than distances of pairs of electrodes obtained by using only electrodes arranged on the same segment of sensor cable; and an electromagnetic field source for generating a time-varying electromagnetic field.
    [13" id="c-fr-0013]
    13. The electromagnetic research system according to claim 12, further comprising a research vessel and a towing cable connected to the research vessel for towing the electromagnetic sensor cable.
    [14" id="c-fr-0014]
    14. The electromagnetic research system according to claim 12, wherein the electromagnetic field source comprises a bipolar electrode.
    [15" id="c-fr-0015]
    15. The electromagnetic search system according to claim 12, wherein a selected number of the electrodes on the sensor cable segments is wired in order to have an electrical connection capability at a rear end of the particular cable segment relative to a direction a towing line, in which a selected number of electrodes on the sensor cable segments is wired in order to have an electrical connection capability at a front end of the particular cable segment relative to a towing direction, and in which a plurality Wire passage cables extend inside the sensor cable segments from the front end to the rear end.
    [16" id="c-fr-0016]
    16. The electromagnetic research system as claimed in claim 12, further comprising a pin assignment of connector wires of connected electrodes and wire passage cables in connectors configured to connect segments of sensor cable and / or processing modules. signal, so that a single section of sensor cable configuration can be used to access different electrodes therein, depending on a number of sections of sensor cable connected to each other between successive modules of signal processing and acquisition.
    [17" id="c-fr-0017]
    17. The electromagnetic research system according to claim 12, in which the signal processing and configuration module (s) is or are further configured to measure voltages at the terminals of selected pairs of electrodes on the same sensor cable segment.
    [18" id="c-fr-0018]
    18. The electromagnetic research system as claimed in claim 12, in which the signal processing and configuration module (s) is or are further configured to communicate signals representative of voltages measured at the terminals of the selected electrodes. .
    [19" id="c-fr-0019]
    19. The electromagnetic research system as claimed in claim 12, in which the signal processing and configuration module (s) comprises (s) a configuration plug which can be electrically configured to electrically connect at least two electrodes to signal processing circuits, in which the signal processing and configuration module (s) comprises or include a low noise amplifier in signal communication with the configuration plug, an analog-digital converter and an electrical converter -optic in electrical connection with the low noise amplifier.
    5
    [0020]
    20. The electromagnetic research system according to claim 12, further comprising a wire passage cable comprising electrical conductors extending from one longitudinal end to the other, without connection to an electrode.
    2/5
    3/5
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    同族专利:
    公开号 | 公开日
    FR2980299A1|2013-03-22|
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    BR102012023666A2|2014-12-02|
    NO344078B1|2019-09-02|
    NO20171078A1|2013-03-20|
    BR102012023666B1|2020-12-08|
    US8710845B2|2014-04-29|
    FR2980299B1|2017-12-01|
    NO344077B1|2019-09-02|
    GB201215611D0|2012-10-17|
    US20130069657A1|2013-03-21|
    GB2494759B|2015-11-04|
    FR3054923B1|2022-03-04|
    NO20120945A1|2013-03-20|
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    法律状态:
    2017-08-23| PLFP| Fee payment|Year of fee payment: 6 |
    2018-09-25| PLFP| Fee payment|Year of fee payment: 7 |
    2019-09-25| PLFP| Fee payment|Year of fee payment: 8 |
    2020-09-25| PLFP| Fee payment|Year of fee payment: 9 |
    2021-07-02| PLSC| Publication of the preliminary search report|Effective date: 20210702 |
    2021-09-27| PLFP| Fee payment|Year of fee payment: 10 |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/236,158|US8710845B2|2011-09-19|2011-09-19|Electromagnetic sensor cable and electrical configuration therefor|
    FR1258728A|FR2980299B1|2011-09-19|2012-09-18|ELECTROMAGNETIC SENSOR CABLE AND ELECTRICAL CONFIGURATION THEREOF|
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