Optical fiber sound wave and temperature scale detection device and detection method based on logging winch

Abstract

The invention discloses an optical fiber sound wave and temperature scale detection device and method based on a logging winch, and belongs to the technical field of optical fiber logging. The vibration control device provides frequency-adjustable driving current for the vibration component, and the constant temperature control device provides driving current for the heating component, detects the internal temperature and has a constant temperature function; the vibration component can generate mechanical vibration with different frequencies under the action of the driving current; the heating component increases the internal temperature of the graduator to a preset value under the control of the driving current; two scale detection devices are arranged, and temperature and vibration signal scales are achieved by changing the constant temperature and the vibration frequency; further, two scale devices are arranged, the distance between the two scale devices measured by acquisition software and the actual distance of the two scale devices are compared and calculated, optical cable length coefficient scales are achieved, the problem of optical fiber space positioning errors in the optical cable is solved, and help is provided for interpreters to analyze stratum information.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber logging, and relates to an optical fiber acoustic wave and temperature scale detection device and a detection method based on a logging winch, and specifically relates to a scale detection device for calibrating the acoustic wave, temperature and positioning coefficient of an optical fiber in an optical cable by means of an external heat source and an acoustic wave source. Background Art

[0002] Distributed fiber acoustic sensing (DAS) and distributed fiber temperature sensing (DTS) logging technologies use optical fibers to achieve real-time monitoring of vibration and temperature at different locations in the well, and can provide more intelligent technical services such as well site monitoring, wellbore integrity detection, fracturing effect monitoring, injection volume monitoring, etc. On the one hand, due to the different refractive indices of optical fibers from different manufacturers, the different excess lengths of optical fibers in steel pipes during cable making, and the different basic parameter settings of various decoding panels, there are certain differences in the spatial positioning between DAS / DTS and logging cables. The existing solution is that after the DAS / DTS system finds the end of the optical fiber, it reverses the spatial position and logging depth of the formation corresponding to the optical signal based on the spatial resolution of its own equipment and the length of the optical cable downhole recorded by the logging winch. This method relies more on the accuracy of the equipment and the judgment ability of the interpreter, and may cause human errors. Therefore, it is necessary to use a calibration device to determine the length relationship of the three in advance.

[0003] On the other hand, after single-mode and multi-mode optical fibers are made into logging cables, they are wrapped in protective layers and cable armor, and their temperature and vibration monitoring capabilities are weakened and smoothed. It is necessary to test the temperature and noise measurement capabilities of DAS / DTS equipment. The existing solution is to obtain a relative test data by comparing the signal size at different locations underground, but it cannot determine the specific vibration intensity and temperature smoothing characteristics. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of errors in the spatial positioning of each optical fiber in the optical cable in the prior art, and to provide an optical fiber acoustic wave and temperature scale detection device and detection method based on a logging winch.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention proposes an optical fiber acoustic wave and temperature scale detection device based on a logging winch, comprising two scale detection devices, wherein the scale detection device comprises a vibration control device, a constant temperature control device and a hollow structure optical cable reserved channel;

[0007] Vibration components are sleeved on both ends of the outer wall of the optical cable reserved channel, and a heating component is sleeved on the middle position of the outer wall of the optical cable reserved channel; the vibration control device is installed above the vibration component, and the constant temperature control device is installed above the heating component.

[0008] Preferably, a guard plate is installed below the vibration component and the heating component.

[0009] Preferably, an optical cable fixing device is installed at one end of the optical cable reserved channel.

[0010] Preferably, a coupling component for coupling temperature and vibration is provided between the optical cable reserved channel and the vibration component and the heating component.

[0011] Preferably, the coupling component is made of rubber material.

[0012] Preferably, a battery compartment is installed on the other side of the constant temperature control device, and the vibration control device, the vibration component, the constant temperature control device and the heating component are all connected to the battery compartment.

[0013] Preferably, the distance between the two scale detection devices is greater than 100 meters.

[0014] Preferably, the diameter of the optical cable reserved channel is larger than the diameter of the optical cable.

[0015] The present invention proposes a fiber optic acoustic wave and temperature scale detection method based on a logging winch, comprising the following steps:

[0016] After the logging optical cable passes through the reserved channel for the optical cable, select the vibration control device to test the frequency on the vibration component, and set the constant temperature control device to test the temperature on the heating component;

[0017] Observe the temperature change and frequency response of the test point on the DAS / DTS panel, and record the temperature rise amplitude, width and spatial position of the test point, as well as the frequency and spatial position of the vibration point;

[0018] Use the winch to continuously release a certain length of optical cable, place another scale detection device at the place where the optical cable is released last, set the two scale detection devices to the same frequency and temperature, repeat the last recording operation on the DAS / DTS panel to check the signal consistency;

[0019] By comparing the data spacing between the two recording points and the actual distance between the two scale measuring devices, the length coefficient of the DAS / DTS system is adjusted to make the test points of the two consistent with the corresponding spatial positions of the optical cable. The constant temperature is changed by the constant temperature control device, and the vibration frequency is changed by the vibration control device to achieve scale detection of temperature and vibration.

[0020] Preferably, the thermostat temperature and the vibration frequency are varied based on a two-point scale method.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention proposes an optical fiber acoustic wave and temperature scale detection device based on a logging winch, wherein a vibration control device provides a driving current with adjustable frequency for a vibration component, and a constant temperature control device provides a driving current for a heating component, detects the internal temperature and has a constant temperature function; the vibration component can generate mechanical vibrations of different frequencies under the action of the driving current; the heating component increases the internal temperature of the scale to a preset value under the control of the driving current; two scale detection devices are set to achieve comparison between the test points of the two and the corresponding spatial positions of the optical cable, and if the comparison is consistent, the constant temperature of the scale device is changed by the constant temperature control device, and the vibration frequency of the scale device is changed by the vibration control device, so as to achieve accurate temperature and noise measurement, solve the problem of spatial positioning error of each optical fiber in the optical cable, and provide assistance to interpreters in analyzing formation information.

[0023] Furthermore, the coupling component can complete the transmission of the acoustic signal, and the component can be manufactured into replaceable components with different inner diameters, so as to facilitate the calibration work with logging optical fibers of different sizes.

[0024] Furthermore, a guard plate is installed under the vibration component and the heating component to protect the device from being bumped when placed underground.

[0025] Furthermore, an optical cable fixing device is installed at one end of the optical cable reserved channel and fixed together with the optical cable to prevent the optical cable from slipping away during work.

[0026] Furthermore, a battery compartment is installed on the other side of the constant temperature control device, and the vibration control device, the vibration component, the constant temperature control device and the heating component are all connected to the battery compartment and can work directly without the power supply system.

[0027] The present invention proposes a fiber optic acoustic wave and temperature scale detection method based on a logging winch, which realizes accurate temperature and noise measurement by comparing the corresponding spatial position information of the test point and the optical cable, and then combining a constant temperature control device and a vibration control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural diagram of the optical fiber acoustic wave and temperature scale detection device based on the logging winch of the present invention.

[0030] Figure 2 This is a physical picture of the optical fiber acoustic wave and temperature scale detection device based on the logging winch of the present invention.

[0031] Figure 3 The present invention is a flow chart of the optical fiber acoustic wave and temperature scale detection method based on the logging winch.

[0032] Among them: 1-vibration control device; 2-vibration component; 3-temperature and vibration coupling component; 4-optical cable reserved channel; 5-protective plate; 6-constant temperature control device; 7-heating component; 8-battery compartment; 9-optical cable fixing device. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection 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.

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0040] The present invention proposes an optical fiber acoustic wave and temperature scale detection device based on a logging winch, such as Figure 1 to Figure 2 As shown, it includes two scale measuring devices, and the scale measuring device includes a vibration control device 1, a constant temperature control device 6 and a hollow structure optical cable reserved channel 4;

[0041] Vibration components 2 are sleeved on both ends of the outer wall of the optical cable reserved channel 4, and a heating component 7 is sleeved in the middle position of the outer wall of the optical cable reserved channel 4, which is a circular resistance wire heating component 7; the vibration control device 1 is installed above the vibration component 2, and the constant temperature control device 6 is installed above the heating component 7 to facilitate temperature setting.

[0042] Among them, the diameter of the optical cable reserved channel 4 is larger than the diameter of the optical cable. A protective plate 5 is installed under the vibration component 2 and the heating component 7 to protect the device from being bumped when placed underground. A coupling component 3 for coupling temperature and vibration is provided between the optical cable reserved channel 4 and the vibration component 2 and the heating component 7, which can better couple the temperature and vibration signals. The coupling component 3 is made of rubber material, which is relatively soft and elastic, so it has strong inclusiveness, and its insulation is non-conductive. An optical cable fixing device 9 is installed at one end of the optical cable reserved channel 4, which is fixed to the optical cable to prevent the optical cable from slipping away in the working state.

[0043] A battery compartment 8 is installed on the other side of the thermostatic control device 6, and the vibration control device 1, the vibration component 2, the thermostatic control device 6 and the heating component 7 are all connected to the battery compartment 8. The distance between the two scale devices is proportional to the spatial positioning correction accuracy, and the distance is greater than 100 meters.

[0044] The present invention proposes a detection method based on an optical fiber acoustic wave and temperature scale detection device of a logging winch, such as Figure 3 As shown, the following steps are included:

[0045] Step 1: After the logging optical cable passes through the reserved optical cable channel 4, the vibration control device 1 is selected to test the frequency on the vibration component 2, and the constant temperature control device 6 is set to test the temperature on the heating component 7;

[0046] Set the test frequency on the vibration control device 1 and confirm it on the vibration component 2; set the test temperature on the constant temperature control device 6 and confirm it on the thermal component 7.

[0047] Step 2: Observe the temperature change and frequency response of the test point on the DAS / DTS panel, and record the temperature rise amplitude, width and spatial position of the test point, as well as the frequency and spatial position of the vibration point;

[0048] Step 3: Use the winch to continuously release a certain length of optical cable, place another calibration detection device at the place where the optical cable is released last, set the calibration device to the same frequency and temperature, and observe the last recording operation on the DAS / DTS panel to check the signal consistency;

[0049] Step 4: By comparing the data spacing between the two recording points and the actual distance between the two scale measuring devices, adjust the length coefficient of the DAS / DTS system so that the test points of the two are consistent with the corresponding spatial positions of the optical cable, change the constant temperature through the constant temperature control device 6, and change the vibration frequency through the vibration control device 1 to achieve scale detection of temperature and vibration.

[0050] Based on the two-point calibration method, the constant temperature and vibration frequency are changed and the calibration coefficient is calculated.

[0051] This detection method requires the following equipment: logging winch, logging optical cable, distributed optical fiber acoustic sensor well logging system DAS, distributed optical fiber temperature sensor well logging system DTS, and it is recommended to use two sets of calibration devices.

[0052] The specific working process is as follows:

[0053] The distributed fiber optic acoustic logging system DAS and the distributed fiber optic temperature logging system DTS are respectively connected to different cable cores at the end of the logging cable winch. The other end of the logging cable passes through the scaler 1 through the reserved cable channel 4, and the cable fixing device 9 is locked. Turn on the power switch on the battery compartment 8, turn on the working switch of the vibration control device 1, select the standard test frequency 440Hz signal, turn on the working switch of the constant temperature control device 6, and set the constant temperature to 60℃. Observe the noise signal of the test point on the DAS panel, and record the noise frequency and noise point position. Observe the temperature change of the test point on the DTS panel, and record the temperature rise amplitude, width and spatial position. Release 200 meters of test optical cable through the winch, use the same method to connect the scale device 2, or move the scale device 1 to 200 meters of the optical cable. Set the scale device to the same frequency and the same temperature, observe and repeat the last recording operation on the DAS / DTS panel to check the signal consistency. By comparing the data spacing between the two recording points before and after and the actual distance between the two calibration detection devices, adjust the DAS / DTS system calculation parameters respectively so that the test points of the two are consistent with the corresponding spatial positions of the optical cable. If there is still a difference, repeat the above process to adjust the panel parameters. Afterwards, the constant temperature of the calibration device can be changed to 100°C through the constant temperature control device 6, and the DTS system calibration can be completed through the two-point calibration method. The vibration frequency of the calibration device is changed to 1000Hz through the vibration control device 1, and the DAS system calibration is completed through the two-point calibration method, and the noise measurement accuracy and noise sensitivity of the DAS system are verified.

[0054] The method of use is as follows: DAS and DTS systems are connected to the corresponding cable cores at the winch end of the logging optical cable respectively, the other end of the logging optical cable passes through the optical cable reserved channel 4 in the middle of the calibration device, the optical cable fixing device 9 is locked, the working switch on the vibration control device 1 is turned on, the test frequency is selected, the heating control switch on the constant temperature control device 6 is turned on, the test temperature is set, and the temperature change and frequency response of the test point are observed on the DAS / DTS panel, and the temperature rise amplitude, width and spatial position of the observation point, as well as the frequency and spatial position of the vibration point are recorded respectively. Use the winch to continuously release a certain length of optical cable, during which the length of the released optical cable is recorded by Martin Dike, and then connect the second calibration device, or move the calibration device to the last place where the optical cable is released, and set the calibration device to the same frequency and the same temperature. Observe and repeat the last recording operation on the DAS / DTS panel to check the signal consistency. By comparing the data spacing between the two recording points before and after and the actual distance between the two calibration detection devices, adjust the DAS / DTS system parameters respectively so that the test points of the two are consistent with the corresponding spatial positions of the optical cable. Then, the constant temperature of the scale device can be changed by the constant temperature control device 6, and the DTS system calibration can be completed by the two-point calibration method. The vibration frequency of the scale device can be changed by the vibration control device 1, and the DAS system calibration can be completed by the two-point calibration method, and the noise measurement accuracy and noise sensitivity of the DAS system can be verified.

[0055] The optical fiber acoustic wave and temperature scale detection device based on logging winch proposed by the present invention has the following advantages: 1) It can be installed on the logging optical cable during the logging process as a standard signal source for comparing downhole signals. 2) It is equipped with a rechargeable battery inside and can work directly without the power supply system. 3) The test accuracy of the DTS / DAS equipment can be verified by changing the test temperature and test frequency. 4) The integrity of the ground equipment and the logging optical cable can be quickly detected before logging. 5) The device can correct the spatial position between each optical fiber and the logging cable. 6) Detect the test accuracy of the optical fiber logging system. 7) It serves as a comparison signal source during the logging process.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical fiber acoustic wave and temperature scale detection device based on a logging winch, characterized in that: It comprises two scale detection devices, wherein the scale detection device comprises a vibration control device (1), a constant temperature control device (6) and a hollow structure optical cable reserved channel (4); A vibration component (2) is sleeved on both ends of the outer wall of the optical cable reserved channel (4), and a heating component (7) is sleeved in the middle of the outer wall of the optical cable reserved channel (4); the vibration control device (1) is installed above the vibration component (2), and the constant temperature control device (6) is installed above the heating component (7).

2. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 1 is characterized in that: A guard plate (5) is installed below the vibration component (2) and the heating component (7).

3. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 1 is characterized in that: An optical cable fixing device (9) is installed at one end of the optical cable reserved channel (4).

4. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 1 is characterized in that: A coupling component (3) for coupling temperature and vibration is provided between the optical cable reserved channel (4), the vibration component (2) and the heating component (7).

5. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 4 is characterized in that: The coupling component (3) is made of rubber material.

6. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 1, characterized in that: A battery compartment (8) is installed on the other side of the constant temperature control device (6), and the vibration control device (1), the vibration component (2), the constant temperature control device (6) and the heating component (7) are all connected to the battery compartment (8).

7. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 1, characterized in that: The distance between the two scale detection devices is greater than 100 meters.

8. The optical fiber acoustic wave and temperature scale detection device based on logging winch according to claim 1, characterized in that: The diameter of the optical cable reserved channel (4) is larger than the diameter of the optical cable.

9. A fiber optic acoustic wave and temperature scale detection method based on a logging winch, characterized in that: The steps include: After the logging optical cable passes through the reserved optical cable channel (4), the vibration control device (1) is selected to test the frequency of the vibration component (2), and the constant temperature control device (6) is set to test the temperature of the heating component (7); Observe the temperature change and frequency response of the test point on the DAS / DTS panel, and record the temperature rise amplitude, width and spatial position of the test point, as well as the frequency and spatial position of the vibration point; Use the winch to continuously release a certain length of optical cable, place another scale detection device at the place where the optical cable is released last, set the two scale detection devices to the same frequency and temperature, repeat the last recording operation on the DAS / DTS panel to check the signal consistency; By comparing the data spacing between the two recording points and the actual distance between the two calibration measuring devices, the length coefficient of the DAS / DTS system is adjusted so that the test points of the two are consistent with the corresponding spatial positions of the optical cable. The constant temperature is changed by the constant temperature control device (6), and the vibration frequency is changed by the vibration control device (1), so as to realize the calibration detection of temperature and vibration.

10. The optical fiber acoustic wave and temperature scale detection method based on logging winch according to claim 9, characterized in that: Changing the thermostat temperature and vibration frequency based on the two-point scale method.

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