Optical fiber direct reading and storage type dual-purpose test system

Abstract

The utility model provides an optical fiber direct reading and storage type dual-purpose test system, which relates to the technical field of well logging and comprises an upper computer and a downhole instrument. The underground instrument is used for collecting underground monitoring data of the oil and gas field and sending the monitoring data to the upper computer, and the upper computer is used for controlling the underground instrument to collect the monitoring data along the oil and gas field; the upper computer is connected with the underground instrument through an optical fiber cable, and the underground instrument is powered by a battery; the underground instrument comprises a union structure, electro-optical conversion equipment, an optical fiber communication control module, a battery bin, a temperature and pressure magnetic positioning circuit board, a magnetic positioning sensor, a temperature probe and a pressure probe. The upper end of the underground instrument is connected with the optical fiber cable through a union structure; the electro-optical conversion device, the optical fiber communication control module, the battery bin, the temperature and pressure magnetic positioning circuit board, the magnetic positioning sensor, the temperature probe and the pressure probe are sequentially installed on the framework from top to bottom. According to the embodiment of the utility model, monitoring data can be acquired in real time, and test accuracy is improved.

Description

Fiber Optic Direct Reading and Storage Dual-Purpose Test System Technical Field

[0001] This utility model relates to the field of well logging technology, and in particular to a dual-purpose testing system for fiber optic direct reading and storage. Background Technology

[0002] In modern oil and gas field development, distributed fiber optic sensing technology has become an important means of downhole fluid dynamic monitoring due to its unique advantages. With the widespread application of DAS (distributed acoustic sensing) and DTS (distributed temperature sensing) technologies, these technologies can achieve continuous monitoring throughout the well section, providing high-resolution data on the distribution of parameters such as temperature and acoustic waves. During oil and gas well production, the accompanying data calibration and depth correction technologies are particularly important for ensuring the accuracy and reliability of monitoring data.

[0003] Currently, downhole fiber optic monitoring systems typically use special optical cables as the sensing carrier, transmitting signals through coupling between the cable and the wellbore structure. However, in practical engineering applications, the deployment of optical cables is affected by a variety of complex factors. First, the complex variations in the wellbore trajectory can cause the optical cable to stretch and elongate. Second, the cable's spatial position changes during its journey through curved sections of the well. Furthermore, common problems encountered during engineering operations, such as obstruction, accumulation, and coiling, also affect the actual deployment of the cable. These factors make it difficult to maintain a precise correspondence between the physical length of the optical cable and its actual well depth.

[0004] While existing direct-reading fiber optic well temperature and pressure gauges can provide relatively accurate downhole parameter measurements, their high cost and limited lifespan restrict their large-scale application. Meanwhile, although small-diameter load-bearing optical-electric composite cables have advantages in certain scenarios, their application in complex well conditions remains limited. These technological limitations make it difficult to accurately obtain the correspondence between the cable position and the actual well depth in real-time during actual operations, thus affecting the quality and accuracy of monitoring data. Summary of the Invention

[0005] In view of this, the purpose of this utility model is to provide a dual-purpose test system for fiber optic direct reading and storage, which realizes signal transmission through fiber optic connection, provides real-time depth, temperature and pressure monitoring, and improves the quality and accuracy of monitoring data.

[0006] This utility model embodiment provides a dual-purpose test system for fiber optic direct reading and storage, including: a host computer and downhole instruments;

[0007] The downhole instrument is used to collect monitoring data from downhole oil and gas fields and send the monitoring data to a host computer. The host computer is used to control the downhole instrument to collect monitoring data along the oil and gas field well. The monitoring data includes temperature data, pressure data, and magnetic positioning data.

[0008] The host computer is connected to the downhole instrument via a fiber optic cable, and the downhole instrument is powered by a battery to operate independently.

[0009] The downhole instrument includes a union structure, an electro-optical conversion device, an optical fiber communication control module, a battery compartment, a temperature, pressure, and magnetic positioning circuit board, a magnetic positioning sensor, a temperature probe, and a pressure probe.

[0010] The upper end of the downhole instrument is connected to the optical fiber cable via a union structure;

[0011] The electro-optical conversion device, the optical fiber communication control module, the battery compartment, the temperature and pressure magnetic positioning circuit board, the magnetic positioning sensor, the temperature probe, and the pressure probe are installed on the frame in a top-to-bottom order; the battery compartment is used to install the battery.

[0012] In a preferred embodiment of this utility model, the host computer is used to set the working mode of the fiber optic communication control module after receiving the handshake request sent by the downhole instrument.

[0013] In a preferred embodiment of this utility model, the host computer includes a photoelectric conversion device, which is used to convert the downlink commands of the host computer into optical signals and transmit them to the downhole instrument through an optical fiber cable.

[0014] In a preferred embodiment of this utility model, the photoelectric conversion device includes a first laser, a second laser, and a multiplexer; the first laser is used to generate a first optical signal, the second laser is used to generate a second optical signal, and the multiplexer is used to combine the first optical signal and the second optical signal to obtain a first composite signal, and send the first composite signal to the optical fiber cable.

[0015] In a preferred embodiment of this invention, the maximum operating temperature of the photoelectric conversion device is 150°C, the transmission rate can reach 1Mb / s, the operating wavelength of the first laser is 1310nm FP, and the operating wavelength of the second laser is 1550nm FP.

[0016] In a preferred embodiment of the present invention, the photoelectric conversion device further includes a demultiplexer and a photodetector; the demultiplexer is used to receive the second composite signal transmitted in the optical fiber cable and separate the second composite signal into a third optical signal and a fourth optical signal according to wavelength; the photodetector is used to convert the third optical signal and the fourth optical signal into corresponding electrical signals.

[0017] In a preferred embodiment of this invention, the working modes of the fiber optic communication control module include direct read mode and storage mode.

[0018] In a preferred embodiment of this utility model, in the direct reading mode, the host computer is used to receive the monitoring data collected by the downhole instrument in real time, set the working time of the storage mode, and send the mode switching command to control the fiber optic communication control module to switch the working mode to the storage mode.

[0019] In a preferred embodiment of this utility model, in the storage mode, the host computer is used to listen to the handshake commands sent by the fiber optic communication control module according to a preset time period. After receiving the handshake command, the host computer sends a mode switching command to control the fiber optic communication control module to switch the working mode to direct read mode.

[0020] In a preferred embodiment of this utility model, the host computer includes a buzzer, which is used to sound after hearing the handshake command sent by the fiber optic communication control module according to a preset time period.

[0021] The present invention provides the following beneficial effects:

[0022] This utility model provides a dual-purpose testing system for fiber optic direct reading and storage. It connects a host computer and downhole instruments via fiber optic cable to achieve signal transmission, enabling the host computer to acquire depth, temperature, and pressure monitoring data in real time, thereby improving the quality and accuracy of the monitoring data.

[0023] Other features and advantages of this disclosure will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above.

[0024] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 is a structural diagram of a dual-purpose test system for fiber optic direct reading and storage provided in an embodiment of this utility model;

[0027] Figure 2 is a flowchart of a method for setting up a fiber optic communication control module on a host computer according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the development and production of oil and gas fields, the acquisition of downhole data is crucial for understanding reservoir dynamics and optimizing production strategies. In existing technologies, oil and gas field downhole data testing systems are typically used to monitor various parameters of the downhole environment, such as temperature and pressure. These parameters reflect the extraction status and changes in geological conditions of the oil and gas field.

[0030] Traditional downhole data testing systems typically use cables to transmit data and are powered by surface equipment. However, these systems have inherent limitations: firstly, reliance on cable power restricts system flexibility, making it difficult to adapt to the demands of long-term independent operation under complex well conditions; secondly, traditional cables have low data transmission rates and are susceptible to electromagnetic interference, resulting in low data transmission efficiency and reliability. Furthermore, the functional modules of downhole instruments in traditional systems are often dispersed and poorly integrated, leading to larger instrument sizes and inconvenient installation and maintenance.

[0031] In recent years, with the development of fiber optic communication technology, fiber optic cables have been gradually introduced into downhole data testing systems to achieve higher bandwidth and more stable data transmission. Simultaneously, to meet the needs of independent operation of downhole instruments, battery-powered technology has also been applied to these systems. However, how to effectively combine fiber optic communication with battery power and design highly integrated downhole instruments remains a pressing technical challenge. Against this backdrop, a new type of oil and gas field downhole data testing system has emerged. It connects the host computer and downhole instruments via fiber optic cables and uses batteries to power the downhole instruments, achieving efficient acquisition and transmission of downhole temperature, pressure, and magnetic positioning data.

[0032] To facilitate understanding of this embodiment, a detailed description of the fiber optic direct reading and storage dual-purpose test system disclosed in this utility model embodiment will be provided first.

[0033] Example 1

[0034] This utility model provides a dual-purpose fiber optic direct reading and storage testing system. Figure 1 is a structural diagram of the dual-purpose fiber optic direct reading and storage testing system provided by this utility model. As shown in Figure 1, the dual-purpose fiber optic direct reading and storage testing system may include the following structure: a host computer and downhole instruments;

[0035] The downhole instrument is used to collect monitoring data from the oil and gas field well and send the data to a host computer. The host computer controls the downhole instrument to collect monitoring data along the oil and gas field well. The monitoring data includes temperature data, pressure data, and magnetic positioning data. It is understood that during the data collection process, the downhole instrument moves forward along the oil and gas field channel, collecting a set of monitoring data after each preset distance. Each set of collected data can be data within a preset time period. For example, the downhole instrument is equipped with a high-precision temperature sensor (such as a platinum resistance thermometer Pt1000), a piezoresistive pressure sensor, and a triaxial magnetoresistive positioning module, which are used to capture downhole temperature, pressure, and magnetic positioning data, respectively. In terms of data acquisition strategy, the downhole instrument adopts a dual-mode of "distance triggering + time window acquisition": when the instrument moves along the wellbore at a constant speed, monitoring data sampling is triggered at regular intervals; simultaneously, each set of collected data is actually data within a preset time window (such as 200ms), ensuring the accuracy and stability of the data.

[0036] The host computer is connected to the downhole instrument via a fiber optic cable, and the downhole instrument is powered by a battery to operate independently.

[0037] The downhole instrument includes a union structure, an electro-optical conversion device, an optical fiber communication control module, a battery compartment, a temperature, pressure, and magnetic positioning circuit board, a magnetic positioning sensor, a temperature probe, and a pressure probe.

[0038] The upper end of the downhole instrument is connected to the optical fiber cable via a union structure;

[0039] The electro-optical conversion device, the optical fiber communication control module, the battery compartment, the temperature and pressure magnetic positioning circuit board, the magnetic positioning sensor, the temperature probe, and the pressure probe are installed on the frame in a top-to-bottom order; the battery compartment is used to install the battery.

[0040] For downhole instruments, the upper end connects to the fiber optic cable. To prevent the fiber optic cable from rotating, a union structure is designed. It is understood that a union structure is a pipe connection component, mainly used to achieve quick connection and disassembly between pipes, valves, and equipment, featuring reliable connection, good sealing performance, and convenient installation. In this embodiment of the invention, the sealing surface and the thread are separate in this union structure. The front end of the sealing surface also has a positioning keyway longer than the sealing surface. During assembly, the keyway is aligned first, and then the tension of the thread is used to bring the sealing ring into the sealing surface. This achieves both sealing and connection functions while preventing rotation of the upper and lower parts.

[0041] The electro-optical conversion device and fiber optic communication control module are both mounted on the frame and securely fixed. The battery has an independent battery compartment for easy replacement. The lower end features an integrated temperature, pressure, and magnetic positioning structure. The entire design is simple and easy to use. In this embodiment, the frame can be composed of multiple circular pipes of the same diameter connected together. The electro-optical conversion device and fiber optic communication control module are mounted inside the same circular pipe and securely fixed. The battery compartment is a circular pipe. The integrated temperature, pressure, and magnetic positioning structure is mounted inside this circular pipe. This structure includes a temperature, pressure, and magnetic positioning circuit board, a magnetic positioning sensor, a temperature probe, and a pressure probe. The circuit board and the magnetic positioning sensor are mounted inside the circular pipe, while the temperature and pressure probes are mounted at the lower end. The temperature, pressure, and magnetic positioning circuit board is a circuit board containing the working circuits of the magnetic positioning sensor, temperature probe, and pressure probe. This circuit board allows for the integrated layout of the working circuits of the magnetic positioning sensor, temperature probe, and pressure probe, enabling real-time acquisition of temperature, pressure, and magnetic positioning data, providing crucial data support for oil and gas field development. Magnetic positioning data is used to describe the depth at which downhole instruments are located underground. It can also be understood as the depth at which the magnetic positioning sensor is located when collecting temperature and pressure data.

[0042] Furthermore, since the downhole instrument can be approximated as a cylinder, in this embodiment, the outer diameter is 26mm or 38mm to adapt to different well conditions. The length is 640mm; the compact design reduces the size of the downhole instrument and improves its adaptability to different well conditions. The downhole instrument has a pressure resistance of 70MPa and an operating temperature of 150℃, ensuring its operation in deep and high-temperature wells, enabling its application in harsh environments. During data acquisition, the downhole instrument acquires pressure and temperature data at a frequency of 1 second / time, magnetic positioning data at 8 points / second, and downhole fiber optic communication at a rate of 1Mbps. The pressure measurement accuracy reaches ±0.05%FS with a resolution of 0.0001MPa; the temperature measurement accuracy reaches ±0.25℃ with a resolution of 0.0001℃; and the magnetic positioning data measurement accuracy reaches a speed range of 300-800 meters / hour.

[0043] Meanwhile, the host computer operates in a temperature range of -40℃ to 85℃ and adopts a fully enclosed structure, which is dustproof and rainproof, ensuring the application of the host computer in harsh environments.

[0044] In this embodiment of the invention, the host computer is connected to the downhole instrument via a fiber optic cable. The downhole instrument is battery-powered and can operate independently. The downhole instrument transmits monitoring data to the host computer on the surface via an electro-optical conversion device. Downlink commands from the host computer are transmitted to the downhole instrument as optical signals, and after being converted into electrical signal commands that the downhole instrument can interpret, the electro-optical conversion device converts them into readable electrical signals. These downlink commands are used to control the operating mode of the downhole instrument, which is also the operating mode of the fiber optic communication control module.

[0045] The host computer includes a photoelectric conversion device, which converts downlink commands from the host computer into optical signals and transmits them to the downhole instrument via an optical fiber cable. The photoelectric conversion device includes a first laser, a second laser, and a multiplexer; the first laser generates a first optical signal, the second laser generates a second optical signal, and the multiplexer combines the first and second optical signals to obtain a first composite signal, which is then transmitted to the optical fiber cable. The photoelectric conversion device also includes a demultiplexer and a photodetector; the demultiplexer receives the second composite signal transmitted in the optical fiber cable and separates it into a third and fourth optical signal according to wavelength; the photodetector converts the third and fourth optical signals into corresponding electrical signals.

[0046] In this embodiment, the photoelectric conversion device uses dual-wavelength multiplexed single-mode fiber to achieve integrated transmission and reception, with both transmission and reception functions operating independently. The maximum operating temperature of the photoelectric conversion device is 150℃, and the transmission rate can reach 1Mb / s.

[0047] Understandably, single-mode fiber has two low-loss windows around 1310nm and 1550nm, determined by the inherent characteristics of the fiber material (quartz glass). The 1310nm wavelength is close to the "zero-dispersion point" (minimum dispersion) of single-mode fiber, resulting in less distortion due to dispersion when the signal is transmitted at this wavelength, making it suitable for high-speed, short- to medium-distance transmission. The 1550nm wavelength has even lower attenuation (approximately 0.2dB / km), making it suitable for long-distance transmission. If bidirectional communication uses the same fiber, uplink and downlink signals need to be isolated using different wavelengths to avoid crosstalk. The wavelength gap between 1310nm and 1550nm is large enough to reduce equipment complexity. Therefore, the operating wavelength of the first laser is 1310nm FP, and the operating wavelength of the second laser is 1550nm FP. Furthermore, the operating wavelengths of the first and second lasers can be interchanged.

[0048] The working process of the photoelectric conversion equipment is as follows:

[0049] The transmission process is as follows: Two lasers generate optical carriers at 1310nm and 1550nm respectively. An electrical signal (downlink command) is loaded onto the optical waves via a modulator, resulting in a first optical signal and a second optical signal. A multiplexer (MUX) combines the two optical signals and transmits them through single-mode fiber. In other words, the first and second optical signals are combined to obtain a first composite signal, ensuring wavelength isolation during the combination (to avoid crosstalk). The single-mode fiber utilizes its low-loss window to transmit the first composite signal.

[0050] The receiving workflow is as follows: When the host computer receives the second composite signal, the demultiplexer separates the third optical signal (1310nm) and the fourth optical signal (1550nm) according to the wavelength difference, and sends them to the corresponding receiving terminals. At each receiving terminal, the photodetector converts the optical signal into an electrical signal, and then demodulates it to recover the original data, which is the monitoring data.

[0051] Optical-to-electrical transceiver circuits can transmit signals between optical fibers, while optical signals experience minimal transmission loss within the fiber. This makes optical transmission mode perform exceptionally well in long-distance transmission applications.

[0052] In downhole instruments, electro-optical conversion devices and photoelectric conversion devices operate on the same principle, employing dual-wavelength multiplexed single-mode optical fibers to achieve integrated transmission and reception, with both transmission and reception functions operating independently. Further details will not be elaborated upon here.

[0053] The fiber optic direct reading and storage dual-purpose testing system provided in this embodiment connects the host computer and the downhole instrument through a fiber optic cable to achieve signal transmission, enabling the host computer to acquire depth, temperature, and pressure monitoring data in real time, thereby improving the quality and accuracy of the monitoring data.

[0054] Example 2

[0055] This utility model embodiment provides a method for setting the working mode of the optical fiber communication control module on a host computer. This method is implemented based on the optical fiber direct reading and storage dual-purpose test system provided in the above embodiment. Figure 2 is a flowchart of the method for setting the working mode of the optical fiber communication control module on a host computer according to this utility model embodiment. As shown in Figure 2, the method for setting the working mode of the optical fiber communication control module on a host computer is as follows:

[0056] Step S101: Power on the host computer and downhole instruments.

[0057] Step S102: The downhole instrument sends a handshake command to the host computer within a preset time period; the preset time period can be 1 minute.

[0058] Step S103: Determine whether the host computer responds.

[0059] If the host computer does not respond, it indicates that the relevant personnel have not performed any operation on the host computer's interface. At this time, proceed to step S104.

[0060] If the host computer responds, it indicates that the relevant personnel have performed the work mode setting operation on the host computer's operation interface. At this time, step S109 is executed.

[0061] Step S104: The downhole instruments operate according to the working mode before the last power outage.

[0062] Step S105: Determine whether the downhole instrument is in direct reading mode.

[0063] If yes, proceed to step S106; otherwise, proceed to step S108.

[0064] Step S106: The host computer operates the downhole instruments.

[0065] The operations performed by the host computer on the downhole instruments can include setting the working time of the storage mode and sending mode switching commands to control the fiber optic communication control module to switch the working mode to storage mode.

[0066] Step S107: Determine whether the downhole instrument is in storage mode.

[0067] If yes, proceed to step S108; otherwise, return to step S106.

[0068] Step S108: Wait for the working time of storage mode to arrive, and then return to execute step S102.

[0069] Step S109: Determine whether the working mode of the downhole instrument is direct reading mode.

[0070] Specifically, if the host computer responds, it indicates that the relevant personnel have performed a working mode setting operation on the host computer's operating interface. At this time, the relevant personnel can set the working mode to direct read mode or storage mode on the host computer's operating interface. If the relevant personnel set the working mode to direct read mode on the host computer's operating interface, proceed to step S106. If the relevant personnel set the working mode to storage mode on the host computer's operating interface, proceed to step S110.

[0071] In step S110, the downhole instrument operates according to the storage mode and executes step S108.

[0072] In this embodiment, the host computer is connected to the downhole instrument via a fiber optic cable. The downhole instrument is battery-powered and can operate independently. The downhole instrument transmits signals to the host computer on the surface via an electro-optical converter, and then transmits the data signals to the host computer via the fiber optic cable. Downlink commands from the host computer are transmitted to the downhole via optical signals, and after being converted into electrical signal commands that the downhole instrument can parse, they are converted into such commands by the electro-optical converter.

[0073] Furthermore, the host computer is used to set the operating mode of the fiber optic communication control module after receiving the handshake request sent by the downhole instrument. The operating modes of the fiber optic communication control module include direct reading mode and storage mode. In direct reading mode, the host computer is used to receive monitoring data collected by the downhole instrument in real time, set the working time of the storage mode, and send mode switching commands to control the fiber optic communication control module to switch its operating mode to storage mode. In storage mode, the host computer is used to listen for handshake commands sent by the fiber optic communication control module according to a preset time period. Upon receiving the handshake command, the host computer sends a mode switching command to control the fiber optic communication control module to switch its operating mode to direct reading mode.

[0074] Understandably, the design of the fiber optic communication control module includes two operating modes: direct read mode and storage mode.

[0075] In direct-read mode, the host computer can directly operate the downhole instrument. This operation includes setting the working time of the storage mode and then sending a command to switch the working mode to storage mode, and the downhole instrument enters a low-power mode.

[0076] In storage mode, the host computer cannot operate the slave computer. Only when the working time of storage mode expires will the downhole instrument send a handshake command to the host computer, requesting operation of the downhole instrument. If necessary, the host computer can switch the working mode to direct read mode. If the downhole instrument does not receive the command from the host computer, after one minute, the slave computer will no longer send a handshake command to the host computer and will continue to work in storage mode for the last set time. When the time expires, it will send a handshake command to the host computer again.

[0077] When the instrument is in storage mode and you want to switch to direct-read mode when the storage time expires, but you cannot determine when the storage time will expire, you can activate "Monitoring Mode" on the host computer's operating interface and turn the volume to maximum. When the storage time expires, the host computer will receive a handshake command from the downhole instrument, and its buzzer will sound loudly. After the sound ends, you can send a command to switch the operating mode to direct-read mode. Alternatively, you can pre-select "Automatically switch to direct-read mode" on the host computer's operating interface, and then activate "Monitoring Mode." When the storage mode's operating time expires, the host computer will receive a handshake command from the downhole instrument, and its buzzer will sound loudly. After the sound ends, the host computer will automatically send a command to switch the instrument to direct-read mode.

[0078] In this embodiment of the invention, the power consumption of the instrument is about 25mA in direct reading mode and about 5mA in storage mode. The power consumption is relatively high in direct reading mode, so the working time in direct reading mode should be shortened as much as possible.

[0079] In this embodiment of the invention, the host computer and the downhole instrument use asynchronous serial communication with a baud rate of 115200 Hz, 1 start bit, 8 data bits, no parity bit, and 1 stop bit.

[0080] The fiber optic direct reading and storage dual-purpose testing system provided in this embodiment can switch between direct reading mode and storage mode. While ensuring the power consumption of the downhole instrument, it can set the working time of the storage mode, improving the flexibility of monitoring data acquisition. At the same time, when acquiring monitoring data, there is no need to take out the downhole instrument, but it can be directly transmitted through the fiber optic cable, which improves the convenience and efficiency of monitoring data reading.

[0081] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0082] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A dual-purpose test system for fiber optic direct reading and storage, characterized in that, include: Host computer and downhole instruments; The downhole instrument is used to collect monitoring data from oil and gas wells and send the monitoring data to a host computer. The host computer controls the downhole instrument to collect monitoring data along the oil and gas well. The monitoring data includes temperature data, pressure data, and magnetic positioning data. The host computer and the downhole instrument are connected via fiber optic cable. The downhole instrument is powered by a battery and can operate independently. The downhole instrument includes a union structure, an electro-optical conversion device, a fiber optic communication control module, a battery compartment, a temperature, pressure, and magnetic positioning circuit board, a magnetic positioning sensor, a temperature probe, and a pressure probe. The upper end of the downhole instrument is connected to the fiber optic cable via a union structure. The electro-optical conversion device, the fiber optic communication control module, the battery compartment, the temperature, pressure, and magnetic positioning circuit board, the magnetic positioning sensor, the temperature probe, and the pressure probe are installed on the frame in a top-to-bottom order. The battery compartment is used to install the battery.

2. The system according to claim 1, characterized in that, The host computer is used to set the working mode of the fiber optic communication control module after receiving the handshake request sent by the downhole instrument.

3. The system according to claim 1, characterized in that, The host computer includes a photoelectric conversion device, which is used to convert the downlink commands of the host computer into optical signals and transmit them to the downhole instrument through an optical fiber cable.

4. The system according to claim 3, characterized in that, The photoelectric conversion device includes a first laser, a second laser, and a multiplexer; the first laser is used to generate a first optical signal, the second laser is used to generate a second optical signal, and the multiplexer is used to combine the first optical signal and the second optical signal to obtain a first composite signal, and send the first composite signal to the optical fiber cable.

5. The system according to claim 4, characterized in that, The photoelectric conversion device has a maximum operating temperature of 150℃ and a transmission rate of up to 1Mb / s. The first laser has an operating wavelength of 1310nm FP, and the second laser has an operating wavelength of 1550nm FP.

6. The system according to claim 5, characterized in that, The photoelectric conversion device further includes a demultiplexer and a photodetector; the demultiplexer is used to receive the second composite signal transmitted in the optical fiber cable and separate the second composite signal into a third optical signal and a fourth optical signal according to the wavelength; the photodetector is used to convert the third optical signal and the fourth optical signal into corresponding electrical signals.

7. The system according to claim 2, characterized in that, The optical fiber communication control module has two operating modes: direct read mode and storage mode.

8. The system according to claim 7, characterized in that, In the direct reading mode, the host computer is used to receive the monitoring data collected by the downhole instrument in real time, set the working time of the storage mode, and send the mode switching command to control the fiber optic communication control module to switch the working mode to the storage mode.

9. The system according to claim 7, characterized in that, In the storage mode, the host computer is used to listen to the handshake commands sent by the fiber optic communication control module according to a preset time period. After receiving the handshake command, the host computer sends a mode switching command to control the fiber optic communication control module to switch the working mode to direct read mode.

10. The system according to claim 9, characterized in that, The host computer includes a buzzer, which is used to sound after listening to the handshake command sent by the fiber optic communication control module according to a preset time period.

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