Offshore platform logging sensor signal transmission system

Abstract

The invention relates to the technical field of signal transmission, and provides an offshore platform logging sensor signal transmission system. The system comprises an acquisition terminal, a server side and a transmission cable, wherein the acquisition terminal consists of a plurality of sensors for acquiring offshore drilling operation data and a first translation module; the server side consists of a control module and a second translation module; and the transmission cable is connected with the acquisition terminal and the server side. According to the invention, the first translation module and the second translation module for photoelectric signal conversion are respectively arranged at the acquisition terminal and the server side, and the transmission of the optical signal is realized by using the transmission cable, so that the current and voltage signals of the sensor are converted into the optical signal to be transmitted through the optical fiber; and the interference of electromagnetism on signals is effectively avoided. Besides, signal transmission is two-way transmission, parameter signals collected by the sensor can be transmitted, meanwhile, control signals of the sensor can be transmitted, the integration degree is high, and good deployment convenience is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of signal transmission, and in particular to a signal transmission system for an offshore platform logging sensor. Background Art

[0002] Offshore platform logging plays a vital role in offshore drilling operations. Sensors collect data on parameters such as wellhead pressure, temperature, and flow, monitor the wellhead conditions, and transmit these key information to the ground control center. This real-time monitoring enables engineers to detect problems in a timely manner and make corresponding adjustments, improve production efficiency, and shorten production cycles. Mud logging can also monitor the safety status of the wellhead. Once an abnormal situation is found, measures can be taken immediately to effectively prevent accidents and ensure the safety of staff. In the logging process, data transmission is an important link, and the accuracy of data transmission is related to the accuracy of monitoring drilling operations. Therefore, a stable data transmission system is a key step to improve the accuracy of logging.

[0003] However, the existing offshore platform logging sensor signal transmission system mainly transmits data through cables. However, since the drilling equipment may generate strong currents when working, the strong currents may generate electromagnetic interference under certain circumstances, which will seriously interfere with the data transmitted in the cable. Therefore, how to improve the anti-interference ability of offshore platform logging sensor signal transmission is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides an offshore platform logging sensor signal transmission system, which aims to solve the problem that electromagnetic interference affects cable transmission data in the existing offshore platform logging sensor signal transmission scheme.

[0005] A first aspect of the present invention provides an offshore platform logging sensor signal transmission system, comprising:

[0006] A collection terminal, the collection terminal comprising a plurality of sensors and a first translation module;

[0007] Wherein, the plurality of sensors are configured to collect offshore drilling operation data and output a plurality of data electrical signals corresponding to the offshore drilling operation data;

[0008] The first translation module is configured to perform data electro-optical modulation on the data electrical signals output by the plurality of sensors to generate data optical signals, and to perform data opto-electronic demodulation on the control optical signals transmitted to the acquisition terminal to generate control electrical signals;

[0009] A server side, the server side comprising a second translation module and a control module;

[0010] The second translation module is configured to perform data optoelectronic demodulation on the data optical signal transmitted to the server end to generate a data electrical signal, and perform data electro-optical modulation on the control electrical signal output by the control module to generate a control optical signal;

[0011] Wherein, the control module is configured to generate a control electrical signal for transmission to the second translation module according to the received data electrical signal;

[0012] A transmission cable connects the acquisition terminal and the server end, and is configured to transmit the data optical signal and the control optical signal.

[0013] Optionally, the data electrical signal includes: a current electrical signal and a voltage electrical signal; the sensor includes: a hydrogen sulfide sensor that outputs a current electrical signal, a pressure sensor, a pool volume sensor, a combustible gas sensor, a drilling fluid temperature sensor, a drilling fluid specific gravity sensor and a drilling fluid conductivity sensor, and a combination of one or more sensors selected from the group consisting of a pump stroke sensor, a winch sensor and a mud return flow sensor that outputs a voltage electrical signal.

[0014] Optionally, the first translation module and the second translation module specifically include:

[0015] An electro-optical conversion unit, wherein the electro-optical conversion unit is configured to, when receiving an electrical signal transmitted by a sensor or a control module, modulate and convert the electrical signal according to a preset rule, generate a translated optical signal, and transmit the optical signal to a transmission cable;

[0016] The photoelectric conversion unit is configured to demodulate and convert the optical signal according to preset rules when receiving the optical signal transmitted by the transmission cable, generate a translated electrical signal, and transmit the electrical signal to the sensor or control module.

[0017] Optionally, the electro-optical conversion unit specifically includes:

[0018] a laser transmitter configured to generate an optical carrier signal having an optical intensity of A(t) and transmit the optical carrier signal to a modulator;

[0019] a modulator, the modulator being configured to modulate the optical carrier signal with the received electrical signal to generate a translated optical signal;

[0020] A power supply module is configured to supply power to the optical carrier signal generation of the laser transmitter and the optical carrier signal modulation of the modulator.

[0021] Optionally, the expression of the optical carrier signal is specifically:

[0022]

[0023] Where E(t) is the electric field intensity, E0 is the constant field amplitude, φ n (t) is the phase noise, n0 is the refractive index of the surface material inside the laser transmitter, ε0 is the dielectric constant of vacuum, and c is the speed of light;

[0024] The expression of the translated optical signal is specifically:

[0025]

[0026]

[0027] Where λ is the operating wavelength, Δn eff (t) is the change in effective refractive index, l i is the interaction length.

[0028] Optionally, the electro-optical conversion unit further includes:

[0029] An electric signal conversion circuit, wherein the electric signal conversion circuit is configured to convert the current electric signal into a voltage electric signal when receiving the current electric signal collected by the sensor;

[0030] The modulator is configured as follows:

[0031] When receiving the current electrical signal transmitted by the sensor, the current electrical signal is transmitted to the electrical signal conversion circuit, and the voltage electrical signal output by the electrical signal conversion circuit is modulated on the optical carrier signal to generate a translated optical signal;

[0032] When the voltage electrical signal transmitted by the sensor is received, the voltage electrical signal is directly modulated on the optical carrier signal to generate a translated optical signal.

[0033] Optionally, the photoelectric conversion unit specifically includes:

[0034] an optical front end, the optical front end being configured to, upon receiving an optical signal transmitted by the transmission cable, mix the optical signal with a local oscillation signal and generate a current component;

[0035] a transimpedance amplifier configured to convert the current component into a voltage signal, use the voltage signal as a translated electrical signal, and transmit the electrical signal to a sensor or a control module;

[0036] A power supply module is configured to supply power to the current generation of the optical front end and the current conversion of the transimpedance amplifier.

[0037] Optionally, when receiving an optical signal transmitted by the transmission cable, mixing the optical signal with a local oscillation signal and generating a current specifically includes:

[0038] When receiving the optical signal transmitted by the transmission cable, the optical signal is coupled with the local oscillator signal in a circuit composed of four 3dB couplers and one The two current components are combined in the phase shifter to obtain two current components, one in phase and the other in quadrature. The expressions of the two current components are specifically:

[0039]

[0040] Where x(t) is the transmitted optical signal, E lo (t) is the local oscillation signal.

[0041] Optionally, the photoelectric conversion unit further includes:

[0042] an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit is configured to convert the voltage signal transmitted by the transimpedance amplifier into a digital signal when receiving the voltage signal;

[0043] The transimpedance amplifier is configured as:

[0044] When receiving the current component generated by the acquisition terminal, converting the current component into a voltage signal, transmitting the voltage signal to the analog-to-digital conversion circuit to convert the voltage signal, generating a digital signal and transmitting it to the control module;

[0045] When the current component generated by the control module is received, the current component is converted into a voltage signal, the voltage signal is used as a translated electrical signal, and the electrical signal is directly transmitted to the sensor.

[0046] Optionally, the transmission cable specifically includes:

[0047] An optical fiber core, wherein the optical fiber core is configured to transmit a data optical signal and a control optical signal between the acquisition terminal and the server end;

[0048] The copper wire conductor is configured to connect to a first translation module of the acquisition terminal and to supply power to the first translation module.

[0049] The beneficial effect of the present invention is that a signal transmission system for logging sensors on an offshore platform is proposed, the system comprising: a collection terminal composed of a plurality of sensors for collecting offshore drilling operation data and a first translation module, a server end composed of a control module and a second translation module, and a transmission cable connecting the collection terminal and the server end. The present invention respectively sets a first translation module and a second translation module for photoelectric signal conversion on the collection terminal and the server end, and then uses a transmission cable to realize the transmission of optical signals, thereby converting the current and voltage signals of the sensor into optical signals for transmission through optical fibers, effectively avoiding electromagnetic interference with the signal. In addition, the signal transmission is bidirectional, which can not only transmit the parameter signals collected by the sensor, but also transmit the control signals for the sensor, with a high degree of integration and good deployment convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic structural diagram of the offshore platform logging sensor signal transmission system provided by the present invention.

[0051] Reference numerals:

[0052] 10 - acquisition terminal; 101 - sensor; 102 - first translation module; 20 - server end; 201 - second translation module; 30 - transmission cable. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Embodiment 1:

[0055] Reference Figure 1 , Figure 1 A schematic structural diagram of a signal transmission system for an offshore platform logging sensor provided in an embodiment of the present invention.

[0056] like Figure 1As shown, a signal transmission system of an offshore platform logging sensor 101 includes: an acquisition terminal 10, wherein the acquisition terminal 10 includes a plurality of sensors 101 and a first translation module 102; wherein the plurality of sensors 101 are configured to acquire offshore drilling operation data and output a plurality of data electrical signals corresponding to the offshore drilling operation data; wherein the first translation module 102 is configured to perform data electro-optical modulation on the data electrical signals output by the plurality of sensors 101 to generate data optical signals, and perform data photoelectric demodulation on the control optical signals transmitted to the acquisition terminal 10 to generate control electrical signals; a server end 20, wherein the plurality of sensors 101 are configured to perform data electro-optical modulation on the data electrical signals output by the plurality of sensors 101 to generate data optical signals; and a server end 20, wherein the plurality of sensors 101 are configured to perform data electro-optical modulation on the data electrical signals output by the plurality of sensors 101 to generate data optical signals; The server side 20 includes a second translation module 201 and a control module; wherein the second translation module 201 is configured to perform data optoelectronic demodulation on the data optical signal transmitted to the server side 20 to generate a data electrical signal, and to perform data electro-optical modulation on the control electrical signal output by the control module to generate a control optical signal; wherein the control module is configured to generate a control electrical signal for transmission to the second translation module 201 based on the received data electrical signal; a transmission cable 30, wherein the transmission cable 30 connects the acquisition terminal 10 and the server side 20, and is configured to transmit the data optical signal and the control optical signal.

[0057] It should be noted that the existing offshore platform logging sensor 101 signal transmission system mainly transmits data through cables, but since the drilling equipment may generate strong currents when working, the generation of strong currents may generate electromagnetic interference under certain circumstances, and the electromagnetic interference will seriously interfere with the data transmitted in the cable. In order to solve the above problems, the existing offshore platform logging sensor 101 signal transmission system adopts the cable transmission method, which is susceptible to electromagnetic interference. This embodiment proposes a sensor 101 signal transmission system based on optical signals, which includes: a collection terminal 10 composed of a plurality of sensors 101 for collecting offshore drilling operation data and a first translation module 102, a server end 20 composed of a control module and a second translation module 201, and a transmission cable 30 connecting the collection terminal 10 and the server end 20. During the sensor 101 signal transmission process, the current and voltage signals are converted into optical signals by the first translation module 102 of the collection terminal 10 and transmitted through optical fibers, effectively avoiding electromagnetic interference on the signal. In addition, the signal transmission is bidirectional, which can not only transmit the parameter signal collected by the sensor 101, but also convert the control signal into an optical signal through the second translation module 201 of the server side 20 and transmit it through the optical fiber. In this way, the control signal of the sensor 101 is transmitted, with a high degree of integration and good deployment convenience.

[0058] In a preferred embodiment, the data electrical signal includes: a current electrical signal and a voltage electrical signal; the sensor 101 includes: a hydrogen sulfide sensor, a pressure sensor, a pool volume sensor, a combustible gas sensor, a drilling fluid temperature sensor, a drilling fluid specific gravity sensor and a drilling fluid conductivity sensor that outputs a current electrical signal, and a combination of one or more sensors 101 selected from a pump stroke sensor, a winch sensor and a mud return flow sensor that outputs a voltage electrical signal.

[0059] In this embodiment, the current electrical signals output by the hydrogen sulfide sensor, the pressure sensor, the tank volume sensor and the combustible gas sensor are 4-20mA current signals; the voltage electrical signals output by the pump stroke sensor, the winch sensor and the mud return sensor are 0-10V voltage signals (wherein the pump stroke sensor and the winch sensor output 0-10V pulse voltage signals); the raw data collected by all sensors 101 are transmitted to the first translation module 102 via a BUS cable. Among them, the BUS cable is divided into 2-core and 4-core, and the 4-core interface is compatible with the 2-core, thereby realizing the collection and transmission of the voltage electrical signals and current electrical signals of several sensors 101 using the BUS cable.

[0060] In a preferred embodiment, the first translation module 102 and the second translation module 201 specifically include: an electro-optical conversion unit, which is configured to, when receiving an electrical signal transmitted by the sensor 101 or the control module, perform modulation and conversion on the electrical signal according to a preset rule, generate a translated optical signal, and transmit the optical signal to the transmission cable 30; a photoelectric conversion unit, which is configured to, when receiving an optical signal transmitted by the transmission cable 30, perform demodulation and conversion on the optical signal according to a preset rule, generate a translated electrical signal, and transmit the electrical signal to the sensor 101 or the control module.

[0061] In this embodiment, the first translation module 102 provided at the acquisition terminal 10 and the second translation module 201 provided at the server end 20 are both composed of an electro-optical conversion unit that can convert an electrical signal into an optical signal and a photoelectric conversion unit that can convert an optical signal into an electrical signal. Among them, the electro-optical conversion unit is used at the acquisition terminal 10 to modulate and convert the data electrical signal collected by the sensor 101 into a data optical signal, and the photoelectric conversion unit is used at the server end 20 to demodulate and convert the data optical signal in the transmission cable 30 back into a data electrical signal; the electro-optical conversion unit is used at the server end 20 to modulate and convert the control electrical signal of the control module into a control optical signal, and the photoelectric conversion unit is used at the acquisition terminal 10 to demodulate and convert the control optical signal in the transmission cable 30 back into a control electrical signal. Therefore, by providing the first translation module 102 and the second translation module 201, while converting the current and voltage signals of the acquisition terminal 10 into optical signals and transmitting them to the server end 20, the control signals of the server end 20 can also be converted into optical signals and transmitted to the acquisition terminal 10 to control the operation of the sensor 101, thereby realizing two-way signal anti-interference transmission.

[0062] Furthermore, the electro-optical conversion unit specifically includes: a laser transmitter, which is configured to generate an optical carrier signal with a light intensity of A(t) and transmit the optical carrier signal to a modulator; a modulator, which is configured to modulate the optical carrier signal with a received electrical signal to generate a translated optical signal; and a power supply module, which is configured to provide power for the optical carrier signal generation of the laser transmitter and the optical carrier signal modulation of the modulator.

[0063] The expression of the optical carrier signal is specifically:

[0064]

[0065] Where E(t) is the electric field intensity, E0 is the constant field amplitude, φ n (t) is the phase noise, n0 is the refractive index of the surface material inside the laser transmitter, ε0 is the dielectric constant of vacuum, and c is the speed of light;

[0066] The expression of the translated optical signal is specifically:

[0067]

[0068]

[0069] Where λ is the operating wavelength, Δn eff (t) is the change in effective refractive index, l i is the interaction length.

[0070] Wherein, the electro-optical conversion unit also includes: an electrical signal conversion circuit, which is configured to convert the current electrical signal into a voltage electrical signal when receiving the current electrical signal collected by the sensor 101; the modulator is configured to: when receiving the current electrical signal transmitted by the sensor 101, transmit the current electrical signal to the electrical signal conversion circuit, modulate the optical carrier signal with the voltage electrical signal output by the electrical signal conversion circuit, and generate a translated optical signal; when receiving the voltage electrical signal transmitted by the sensor 101, directly modulate the optical carrier signal with the voltage electrical signal to generate a translated optical signal.

[0071] In this embodiment, the electro-optical conversion unit in the first translation module 102 and the second translation module 201 is configured to include a laser emitter, a modulator, a power supply module and an electrical signal conversion circuit; wherein the power supply module provides 12V power supply for the laser emitter, the laser emitter generates stimulated emission, and the generated electric field intensity is E(t). From Maxwell's equations, it can be obtained that the optical carrier signal with a light intensity of A(t) is obtained. After that, the 4-20mA current signal is converted into a 0-10V voltage signal through an operational amplifier using an electrical signal conversion circuit (an operational amplifier is used in this embodiment) (the native 0-10V voltage signal does not need to be converted through an operational amplifier), and the converted voltage is used as an external voltage to modulate A(t) to obtain an optical signal: x(t). Thus, the process of converting the electrical signal modulation into an optical signal based on the laser emitter and the modulator is realized, the current and voltage signals of the acquisition terminal 10 are converted into optical signals and transmitted to the server end 20, and the control electrical signal is converted into a control optical signal and transmitted to the acquisition terminal 10, thereby avoiding electromagnetic interference with the signal and realizing bidirectional signal transmission.

[0072] Furthermore, the photoelectric conversion unit specifically includes: an optical front end, which is configured to mix the optical signal with a local oscillation signal and generate a current component when receiving an optical signal transmitted by the transmission cable 30; a transimpedance amplifier, which is configured to convert the current component into a voltage signal, use the voltage signal as a translated electrical signal, and transmit the electrical signal to the sensor 101 or the control module; and a power supply module, which is configured to power the current generation of the optical front end and the current conversion of the transimpedance amplifier.

[0073] When an optical signal transmitted by the transmission cable 30 is received, the optical signal is mixed with a local oscillation signal and a current is generated, which specifically includes: when an optical signal transmitted by the transmission cable 30 is received, the optical signal is mixed with the local oscillation signal in a circuit composed of four 3dB couplers and one The two current components are combined in the phase shifter to obtain two current components, one in phase and the other in quadrature. The expressions of the two current components are specifically:

[0074]

[0075] Where x(t) is the transmitted optical signal, E lo (t) is the local oscillation signal.

[0076] In which, the photoelectric conversion unit also includes: an analog-to-digital conversion circuit, which is configured to convert the voltage signal into a digital signal when receiving the voltage signal transmitted by the transimpedance amplifier; the transimpedance amplifier is configured to: when receiving the current component generated by the acquisition terminal 10, convert the current component into a voltage signal, transmit the voltage signal to the analog-to-digital conversion circuit to convert the voltage signal, generate a digital signal and transmit it to the control module; when receiving the current component generated by the control module, convert the current component into a voltage signal, use the voltage signal as the translated electrical signal, and directly transmit the electrical signal to the sensor 101.

[0077] In this embodiment, the photoelectric conversion unit in the first translation module 102 and the second translation module 201 is configured to include an optical front end, a transimpedance amplifier, an analog-to-digital conversion circuit and a power supply module. The structure in which the optical front end mixes the input optical signal with the local oscillator laser and generates current is called an optical front end. The received optical signal x(t) and the local oscillator signal E lo (t) is composed of four 3dB couplers and one The two components i are combined in the phase shifter to obtain the in-phase and orthogonal components i I (t) and i Q (t); after this, i I (t) and i Q (t) is sent to a transimpedance amplifier (similar to an operational amplifier) ​​to generate a 0-5V voltage signal; the voltage signal converted from the current component generated by the acquisition terminal 10 is sent to an analog-to-digital conversion circuit to obtain a digital signal, and then transmitted to the server; the voltage signal converted from the current component generated by the server end 20 is not sent to the digital-to-analog converter, but is directly used as a control signal for the acquisition terminal 10. Thus, the process of optical signal demodulation and conversion into electrical signals based on the optical front end and the transimpedance amplifier is realized, the control optical signal in the transmission cable 30 is converted into a control electrical signal and transmitted to the acquisition terminal 10, and the data optical signal in the transmission cable 30 is converted into a data electrical signal and transmitted to the server end 20, thereby avoiding electromagnetic interference on the signal and realizing bidirectional signal transmission.

[0078] In a preferred embodiment, the transmission cable 30 specifically includes: an optical fiber core, which is configured to transmit data optical signals and control optical signals between the acquisition terminal 10 and the server end 20; a copper wire conductor, which is configured to connect the first translation module 102 of the acquisition terminal 10 and provide power for the first translation module 102.

[0079] In this embodiment, the transmission cable 30 is configured as an optoelectronic hybrid cable, which is composed of an optical fiber core and a copper wire conductor. The optical signal is transmitted through the optical fiber core in the optoelectronic hybrid cable, and the copper wire conductor is used to power the first translation module 102.

[0080] In practical applications, a field junction box for accessing the sensor 101 can also be provided. The field junction box has 12 sensor interfaces. The acquisition terminal 10 can simultaneously complete the power supply and signal transmission of 18 sensor field junction boxes through 9 4-core BUS cables; wherein 18 represents 9 BUS cables, each BUS cable is connected to 2 sensor field junction boxes, thereby, the power supply and signal transmission of 216 sensors 101 can be completed simultaneously. Among them, each interface completes the simultaneous power supply and signal transmission function of 1 sensor 101 through a 2-core or 4-core cable, and each interface can realize the power supply and signal transmission of the sensor 101 at the same time. After the sensor 101 is connected to the field junction box, the 12V power supply of the field junction box is used to power the sensor 101, and the sensor 101 is directly supplied through the electric-to-optical conversion and the optical-to-electrical conversion, and the sensor 101 signal is transmitted on this optical path at the same time. It should be noted that the field junction box is provided with a power supply control unit, which is used to control whether the field junction box supplies power to the corresponding sensor when the field junction box is connected to the sensor and supplies power and transmits signals through the transmission cable. By realizing sensor power supply through the power supply control unit instead of external power supply, more flexible and safer sensor control can be achieved, preventing the burning of sensors or field junction boxes.

[0081] Therefore, this embodiment proposes a signal transmission system for an offshore platform logging sensor 101, by respectively setting a first translation module 102 and a second translation module 201 for photoelectric signal conversion on the acquisition terminal 10 and the server end 20, and then using a transmission cable 30 to realize the transmission of optical signals, thereby converting the current and voltage signals of the sensor 101 into optical signals for transmission through optical fibers, effectively avoiding electromagnetic interference with the signal. In addition, the signal transmission is bidirectional, which can not only transmit the parameter signal collected by the sensor 101, but also transmit the control signal of the sensor 101, with a high degree of integration and good deployment convenience.

[0082] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inner side", "outer side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Among them, "inside" refers to an internal or enclosed area or space. "Periphery" refers to the area surrounding a specific component or a specific area.

[0083] In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0084] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "assemble" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0086] In the description of the embodiments of the present invention, it is to be understood that "-" and "~" represent a range between two values, and the range includes the endpoints. For example: "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0087] In the description of the embodiments of the present invention, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0088] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An offshore platform logging sensor signal transmission system, characterized in that: include: A collection terminal, the collection terminal comprising a plurality of sensors and a first translation module; Wherein, the plurality of sensors are configured to collect offshore drilling operation data and output a plurality of data electrical signals corresponding to the offshore drilling operation data; The first translation module is configured to perform data electro-optical modulation on the data electrical signals output by the plurality of sensors to generate data optical signals, and to perform data opto-electronic demodulation on the control optical signals transmitted to the acquisition terminal to generate control electrical signals; A server side, the server side comprising a second translation module and a control module; The second translation module is configured to perform data optoelectronic demodulation on the data optical signal transmitted to the server end to generate a data electrical signal, and perform data electro-optical modulation on the control electrical signal output by the control module to generate a control optical signal; Wherein, the control module is configured to generate a control electrical signal for transmission to the second translation module according to the received data electrical signal; A transmission cable connects the acquisition terminal and the server end, and is configured to transmit the data optical signal and the control optical signal.

2. The offshore platform logging sensor signal transmission system according to claim 1, characterized in that: The data electrical signals include: current electrical signals and voltage electrical signals; the sensors include: a hydrogen sulfide sensor, a pressure sensor, a pool volume sensor, a combustible gas sensor, a drilling fluid temperature sensor, a drilling fluid specific gravity sensor and a drilling fluid conductivity sensor that output current electrical signals, and a combination of one or more sensors selected from the group consisting of a pump stroke sensor, a winch sensor and a mud return flow sensor that output voltage electrical signals.

3. The offshore platform logging sensor signal transmission system according to claim 1, characterized in that: The first translation module and the second translation module specifically include: An electro-optical conversion unit, wherein the electro-optical conversion unit is configured to, when receiving an electrical signal transmitted by a sensor or a control module, modulate and convert the electrical signal according to a preset rule, generate a translated optical signal, and transmit the optical signal to a transmission cable; The photoelectric conversion unit is configured to demodulate and convert the optical signal according to preset rules when receiving the optical signal transmitted by the transmission cable, generate a translated electrical signal, and transmit the electrical signal to the sensor or control module.

4. The offshore platform logging sensor signal transmission system according to claim 3, characterized in that: The electro-optical conversion unit specifically comprises: a laser transmitter configured to generate an optical carrier signal having an optical intensity of A(t) and transmit the optical carrier signal to a modulator; a modulator, the modulator being configured to modulate the optical carrier signal with the received electrical signal to generate a translated optical signal; A power supply module is configured to supply power to the optical carrier signal generation of the laser transmitter and the optical carrier signal modulation of the modulator.

5. The offshore platform logging sensor signal transmission system according to claim 4, characterized in that: The expression of the optical carrier signal is specifically: Where E(t) is the electric field strength, E0 is the constant field amplitude, φ n (t) is the phase noise, n0 is the refractive index of the surface material inside the laser transmitter, ε0 is the dielectric constant of vacuum, and c is the speed of light; The expression of the translated optical signal is specifically: Where λ is the operating wavelength, Δn eff (t) is the change in effective refractive index, l i is the interaction length.

6. The offshore platform logging sensor signal transmission system according to claim 4, characterized in that: The electro-optical conversion unit further includes: An electric signal conversion circuit, wherein the electric signal conversion circuit is configured to convert the current electric signal into a voltage electric signal when receiving the current electric signal collected by the sensor; The modulator is configured as follows: When receiving the current electrical signal transmitted by the sensor, the current electrical signal is transmitted to the electrical signal conversion circuit, and the voltage electrical signal output by the electrical signal conversion circuit is used to modulate the optical carrier signal to generate a translated optical signal; When the voltage electrical signal transmitted by the sensor is received, the voltage electrical signal is directly modulated on the optical carrier signal to generate a translated optical signal.

7. The offshore platform logging sensor signal transmission system according to claim 6, characterized in that: The photoelectric conversion unit specifically includes: an optical front end, the optical front end being configured to, upon receiving an optical signal transmitted by the transmission cable, mix the optical signal with a local oscillation signal and generate a current component; a transimpedance amplifier configured to convert the current component into a voltage signal, use the voltage signal as a translated electrical signal, and transmit the electrical signal to a sensor or a control module; A power supply module is configured to supply power to the current generation of the optical front end and the current conversion of the transimpedance amplifier.

8. The offshore platform logging sensor signal transmission system according to claim 7, characterized in that: When receiving an optical signal transmitted by the transmission cable, the optical signal is mixed with a local oscillation signal to generate a current, specifically including: When receiving the optical signal transmitted by the transmission cable, the optical signal is coupled with the local oscillator signal in a circuit composed of four 3dB couplers and one The two current components are combined in the phase shifter to obtain two current components, one in phase and the other in quadrature. The expressions of the two current components are specifically: Where x(t) is the transmitted optical signal, E lo (t) is the local oscillation signal.

9. The offshore platform logging sensor signal transmission system according to claim 8, characterized in that: The photoelectric conversion unit further includes: an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit is configured to convert the voltage signal transmitted by the transimpedance amplifier into a digital signal when receiving the voltage signal; The transimpedance amplifier is configured as: When receiving the current component generated by the acquisition terminal, convert the current component into a voltage signal, transmit the voltage signal to the analog-to-digital conversion circuit to convert the voltage signal, generate a digital signal and transmit it to the control module; When the current component generated by the control module is received, the current component is converted into a voltage signal, the voltage signal is used as a translated electrical signal, and the electrical signal is directly transmitted to the sensor.

10. The offshore platform logging sensor signal transmission system according to claim 1, characterized in that: The transmission cable specifically comprises: An optical fiber core, wherein the optical fiber core is configured to transmit a data optical signal and a control optical signal between the acquisition terminal and the server end; The copper wire conductor is configured to connect to a first translation module of the acquisition terminal and to supply power to the first translation module.

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