A pre-detection temperature, acoustic wave, and distance calibration device for fiber optic logging.

Abstract

This invention discloses a pre-measurement temperature, acoustic wave, and distance calibration device for fiber optic logging, comprising probe A and probe B. Both probe A and probe B include a measuring cylinder and a circuit module. Probe A further includes a laser ranging probe. Using this invention, a stable and safe heat source and sound can be provided. Through the sound and heat sources in the two probes, the accuracy of fiber optic temperature and acoustic wave measurements can be calibrated in real time. The fiber optic measurement distance can be corrected based on the positional difference between the two probes.

Description

Technical Field

[0001] This utility model relates to the field of oil well logging technology, specifically to a pre-detection temperature, acoustic wave and distance calibration device for fiber optic well logging. Background Technology

[0002] Fiber optic logging involves lowering fiber optic cables into oil and gas wells, where a ground-based laser measurement system emits signals to indirectly measure temperature, sound, and depth signals within the well, thus determining its production status.

[0003] Most logging techniques, such as acoustic amplitude logging and induction logging, require pre-logging calibration to ensure the accuracy of measurement parameters.

[0004] Because fiber optic logging operations are typically conducted in remote, field environments, it is difficult to find safe and stable heat and sound sources. Therefore, current methods or procedures for pre-calibration of temperature, sound, and depth signals in fiber optic logging are lacking. Furthermore, because optical fibers are easily damaged, the fiber optic cables are typically run inside protective steel cables. Consequently, the cables are not fully taut within the steel cables, leading to significant errors when directly measuring their length. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model aims to provide a pre-detection temperature, acoustic wave, and distance calibration device for fiber optic logging.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pre-detection temperature, acoustic wave and distance calibration device for fiber optic logging includes probe A and probe B. Both probe A and probe B include a measuring cylinder and a circuit module. Probe A also includes a laser ranging probe.

[0008] Both ends of the measuring cylinders of probe A and probe B have a circular hole at their center points; the measuring cylinders of probe A and probe B each have a heating element, a temperature measuring probe, and a sound generator inside; the outer shells of the circuit modules of probe A and probe B are respectively fixed to the outer surfaces of the measuring cylinders of probe A and probe B.

[0009] The circuit modules of probes A and B each include a microcontroller, a temperature sensor, a temperature control module, a sound generation module, and a data display module. The temperature sensor, temperature control module, sound generation module, and data display module are all communicatively connected to the microcontroller. The temperature control module is connected to the heating element and is used to control the heating element's activation and deactivation. The temperature sensor is connected to the temperature measurement probe and is used to obtain the corresponding temperature value based on the signal from the temperature measurement probe. The sound generation module is connected to a sound generator and is used to emit sound waves of a set frequency and intensity.

[0010] The fiber optic cable passes through the round holes at both ends of the measuring cylinders of probe A and probe B in sequence, with one end of the measuring cylinder of probe A facing the other end of the measuring cylinder of probe B; the laser ranging probe is located at one end of the outer shell of the circuit module of probe A, and is used to emit pulsed laser to one end of the outer shell of the circuit module of probe B, and to receive the reflected pulsed laser.

[0011] The circuit module of probe A also includes a laser ranging module, which is connected to the microcontroller and the laser ranging probe to obtain the corresponding distance value based on the time of laser emission and reception.

[0012] Furthermore, the measuring cylinders of probe A and probe B are both 1.0m long and 0.05m in diameter, and the diameter of the circular holes at the center points of both ends of the measuring cylinders of probe A and probe B is 0.005m; the horizontal distance between one end of the outer shell of the circuit module of probe A and one end of the measuring cylinder of probe A is 0.5m, and the horizontal distance between one end of the outer shell of the circuit module of probe B and one end of the measuring cylinder of probe B is 0.5m.

[0013] Furthermore, the heating element is 0.25m long and 0.01m wide.

[0014] Furthermore, the heating element is located in the middle of the upper part of the measuring cylinder; the temperature measuring probe and the sound generator are located at both ends of the measuring cylinder, and are respectively 0.2m away from the center of the circular holes at both ends of the measuring cylinder.

[0015] The beneficial effects of this utility model are as follows: This utility model can provide a stable and safe heat source and sound. Through the sound and heat source in the two probes, the accuracy of fiber optic temperature measurement and sound wave can be calibrated in real time. The fiber optic measurement distance can be corrected according to the position difference of the two probes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of probe A in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of probe B in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the measuring cylinders of probe A and probe B in an embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the circuit structure of the circuit module of probe A in this embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the end of probe A in an embodiment of this utility model;

[0021] Figure 6 This is a schematic diagram of the end of probe B in an embodiment of this utility model;

[0022] Figure 7 This is a schematic diagram showing the connection between the optical fiber cable and probes A and B in an embodiment of this utility model. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0024] This embodiment provides a pre-logging calibration device for temperature, acoustic wave, and distance measurements in fiber optic logging, including probe A and probe B, both of which include a measuring cylinder. Figure 1 100 Figure 2 200) and circuit modules ( Figure 1 101 Figure 2 (201), the probe A further includes a laser ranging probe 102;

[0025] In this embodiment, the measuring cylinders 100 and 200 of probe A and probe B are both 1.0m long and 0.05m in inner diameter, and 0.005m circular holes are opened at the center points of both ends of the measuring cylinders 100 and 200 of probe A and probe B. Figure 1 103 in Figure 2 (203 in the middle).

[0026] like Figure 3 As shown, the measuring cylinders of probes A and B are each equipped with a heating element 300, a temperature measuring probe 400, and a sound generator 500. The heating element (length = 0.25m, thickness = 0.001m) is located in the middle of the upper part of the measuring cylinder. The temperature measuring probe 300 and the sound generator 400 are located at both ends of the measuring cylinder, respectively, 0.2m away from the center of the circular holes at both ends.

[0027] like Figure 4 As shown, the circuit modules of probes A and B each include a microcontroller, a temperature sensor, a temperature control module, a sound generation module, and a data display module. The temperature sensor, temperature control module, sound generation module, and data display module are all communicatively connected to the microcontroller. The temperature control module is connected to the heating element and is used to control the heating element's activation and deactivation. The temperature sensor is connected to the temperature measurement probe and is used to obtain the corresponding temperature value based on the signal from the temperature measurement probe. The sound generation module is connected to a transmitter and is used to emit sound waves of a set frequency and intensity (the sound wave frequency is fixed, and the sound wave intensity can be adjusted).

[0028] Specifically, such as Figure 5 , 6 As shown, the housings of circuit modules 101 and 201 of probe A and probe B are fixed to the outer surfaces of measuring cylinders 100 and 200 of probe A and probe B, respectively. The laser ranging probe 102 of probe A is fixed to one end of the housing of circuit module 101 of probe A. Figure 1 , 2 As shown, in this embodiment, the horizontal distance between one end of the outer shell of the circuit module 101 of probe A and one end of the measuring cylinder 100 of probe A is 0.5m, and the horizontal distance between one end of the outer shell of the circuit module 201 of probe B and one end of the measuring cylinder 200 of probe B is 0.5m.

[0029] like Figure 7 As shown, the fiber optic cable 600 passes through the round holes at both ends of the measuring cylinders 100 and 200 of probe A and probe B in sequence. One end of the measuring cylinder 100 of probe A is opposite to one end of the measuring cylinder 200 of probe B. The laser ranging probe 102 faces the end of the outer shell of the circuit module 201 of probe B and is used to emit pulsed laser to the outer shell of the circuit module 201 of probe B and receive the reflected pulsed laser.

[0030] It should be noted that, Figure 4 The circuit structure shown is that of the circuit module of probe A. The circuit module of probe B does not have a laser ranging module.

[0031] like Figure 4 As shown, the circuit module of probe A also includes a laser ranging module. The laser ranging module is connected to the microcontroller and to the laser ranging probe, and is used to obtain the corresponding distance value based on the time when the laser ranging probe emits and receives laser light.

[0032] In the circuit modules of probes A and B, the target temperature value (e.g., 60℃) and target sound wave intensity are pre-programmed into the microcontroller. The microcontroller sends the target temperature value parameter to the temperature control module and the target sound wave intensity to the sound-emitting module. The temperature sensor transmits the acquired temperature value to the microcontroller, which then sends the real-time temperature value to the temperature control module. The temperature control module determines whether to stop the heating element based on the target temperature value. The microcontroller transmits the real-time temperature value, sound wave frequency, and sound wave intensity to the data display module for display. In the circuit module of probe A, the laser ranging module transmits the acquired distance value to the microcontroller, which then displays the distance value on the data display module.

[0033] The working process of the above-mentioned equipment is as follows:

[0034] 1. Place the fiber optic cable horizontally and pass it through the round holes at both ends of the measuring cylinder of probe A and probe B in sequence;

[0035] 2. Ensure that the measuring cylinders of probe A and probe B are spaced at least 5m apart;

[0036] 3. Start probe A and probe B. After starting, the data display module of the circuit module of probe A and probe B will display temperature data and sound wave data (frequency and intensity) in real time.

[0037] 4. Start the fiber optic logging system and, after it has been running stably for 2 minutes, record the temperature and acoustic data along the entire fiber optic cable. It should be noted that the minimum spatial resolution of the currently used fiber optic logging system is 1m, meaning that only one data point is collected within a 1m range.

[0038] Record the temperatures (Temp_FiberA) and corresponding depths (D_Temp_FiberA) and (Temp_FiberB) and their corresponding depths (D_Temp_FiberB) of two anomalous points on the fiber optic cable measured by the fiber optic logging system; record the sound wave frequencies (F_FiberA) and their corresponding depths (D_F_FiberA) and (F_FiberB) with significantly higher sound intensities (F_FiberA and F_FiberB).

[0039] Record the time (Time_A), temperature (Temp_A), sound frequency (F_A), and distance (D_AB) displayed on probe A, and the time (Time_B), temperature (Temp_B), and sound frequency (F_B) displayed on probe B. D_AB is measured by the laser ranging probe and represents the distance between probe A and probe B.

[0040] 6. Adjust the temperature correction coefficient of the fiber optic logging system to simultaneously satisfy:

[0041] Temp_FiberA=Temp_A; Temp_FiberB=Temp_B

[0042] 7. Adjust the acoustic correction coefficient of the fiber optic logging system to simultaneously satisfy:

[0043] F_FiberA=F_A; F_FiberB=F_B

[0044] 8. Adjust the temperature depth correction coefficient and acoustic depth correction coefficient of the fiber optic logging system to simultaneously satisfy:

[0045] D_AB=D_F_FiberA-D_F_FiberB

[0046] D_AB=D_Temp_FiberA-D_Temp_FiberB.

[0047] Once the entire calibration process is complete, the fiber optic cable can be lowered into the well for measurement.

[0048] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this utility model.

Claims

1. A pre-logging temperature, acoustic and distance calibration apparatus for optical fiber logging, characterized by, It comprises probe A and probe B, both of which comprise a measuring cylinder and a circuit module, and the probe A further comprises a laser ranging probe; The center points of the two ends of the measuring cylinder of the probe A and the probe B are provided with a circular hole; the inside of the measuring cylinder of the probe A and the probe B is provided with a heating sheet, a temperature measuring probe and a sound emitter; the shell of the circuit module of the probe A and the probe B is fixed on the outer surface of the measuring cylinder of the probe A and the probe B respectively; The circuit module of the probe A and the probe B comprises a single-chip microcomputer, a temperature measuring sensor, a temperature control module, a sound emitting module and a data display module, and the temperature measuring sensor, the temperature control module, the sound emitting module and the data display module are in communication connection with the single-chip microcomputer; the temperature control module is connected with the heating sheet and is used for controlling the start and stop of the heating sheet; the temperature measuring sensor is connected with the temperature measuring probe and is used for obtaining the corresponding temperature value according to the signal of the temperature measuring probe; The sound emitting module is connected with the sound emitter and is used for emitting sound waves with a set frequency and intensity; An optical fiber steel cable passes through the circular holes at the two ends of the measuring cylinders of the probe A and the probe B in sequence, one end of the measuring cylinder of the probe A is opposite to one end of the measuring cylinder of the probe B; the laser ranging probe is arranged at one end of the shell of the circuit module of the probe A and is used for emitting pulsed laser to one end of the shell of the circuit module of the probe B and receiving reflected pulsed laser; The circuit module of the probe A further comprises a laser ranging module which is in communication connection with the single-chip microcomputer and is connected with the laser ranging probe and is used for obtaining the corresponding distance value according to the time of emitting and receiving laser by the laser ranging probe.

2. The apparatus of claim 1, wherein, The length of the measuring cylinder of the probe A and the probe B is 1.0 m, the inner diameter is 0.05 m, and the diameter of the circular hole provided at the center point of the two ends of the measuring cylinder of the probe A and the probe B is 0.005 m; the horizontal distance between one end of the shell of the circuit module of the probe A and one end of the measuring cylinder of the probe A is 0.5 m, and the horizontal distance between one end of the shell of the circuit module of the probe B and one end of the measuring cylinder of the probe B is 0.5 m.

3. The apparatus of claim 1, wherein, The length of the heating sheet is 0.25 m and the width is 0.01 m.

4. The apparatus of claim 1, wherein, The heating sheet is located in the middle of the upper part of the measuring cylinder; the temperature measuring probe and the sound emitter are respectively located at the two ends of the measuring cylinder and are respectively 0.2 m away from the center of the circular hole at the two ends of the measuring cylinder.

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