An acoustic logging calibration system and method

Abstract

The present invention discloses an acoustic logging calibration system and method, comprising: a cylinder; a centralizer located at the upper part of the cylinder; a standard acoustic wave transmitter; a standard acoustic wave receiver; an acoustic logging tool located at the center of the cylinder through the centralizer; a first control device, which is used to receive and record a first acoustic wave signal obtained by the standard acoustic wave receiver in a first test, and control the standard acoustic wave transmitter to emit a second acoustic wave signal in a second test; a second control device, which is used to control the logging tool transmitter to emit a first acoustic wave signal in the first test, and receive and record a second acoustic wave signal obtained by the logging tool receiver in the second test; a data analysis device, which is used to process and analyze the acoustic wave signals received in the two tests to obtain basic measurement data for calibrating the logging tool transmitter and receiver. The present invention ensures the accuracy and precision of acoustic logging through regular calibration tests without environmental restrictions during the use of the instrument.

Description

Technical Field

[0001] The present invention relates to the technical field of mine geophysics, and more particularly to an acoustic logging calibration system and method. Background Art

[0002] Currently, there are several calibration techniques for acoustic logging tools as follows: The first one is to place the acoustic logging tool flat in a semi-circular aluminum trough filled with liquid, and use the arrival time of the first wave to calculate the sound velocity respectively, and then compare the calculated sound velocity with the sound velocity of the aluminum trough. This comparison can only be regarded as a kind of detection, and its accuracy and accuracy are relatively low; The second one is to select a free casing for acoustic amplitude calibration when performing acoustic amplitude and variable density logging. There are three problems with this calibration: Firstly, the free casing is uncontrollable and not an ideal empty casing; Secondly, the human factor is relatively large and there are large errors; Thirdly, the instrument cannot ensure centered measurement and the calibration is inaccurate; The third one is to place the acoustic logging tool in a water tank for tool calibration, but this method requires the water tank to be large enough and deep enough, which is difficult to achieve in a workshop environment, and it is impossible to calibrate the sound velocity and impossible to calibrate the dipole shear wave.

[0003] Nowadays, with the application of multi-component azimuthal receiving and phased azimuthal transmitting technologies, acoustic logging tools are becoming more and more complex and the measurement content is also increasing, but the problem of tool calibration has not been effectively solved. In addition, the transmitters and receivers in acoustic logging tools can only be calibrated by the manufacturers of transmitters and receivers, and it is impossible to perform regular inspections during tool use and in a workshop environment. As the tool usage time increases, the parameters of the transmitters and receivers will change. If the parameters of the transmitters and receivers are not corrected and calibrated in a timely manner, it will have an adverse impact on the accuracy and precision of acoustic logging.

[0004] Therefore, the prior art needs to provide a calibration solution for acoustic logging tools to solve one or more of the above problems. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an acoustic logging calibration system, comprising: a cylinder; a centralizer located at the upper part of the cylinder; a standard acoustic transmitter disposed at a first mark on the inner wall of the cylinder; a standard acoustic receiver disposed at a second mark on the inner wall of the cylinder; an acoustic logging tool located at the center of the cylinder through the centralizer, wherein the transmitter and receiver in the logging tool are respectively aligned with the standard acoustic receiver and the standard acoustic transmitter; a first control device configured to receive and record a first acoustic signal obtained by the standard acoustic receiver in a first test, and control the standard acoustic transmitter to emit a second acoustic signal in a second test; a second control device configured to control the logging tool transmitter to emit the first acoustic signal in the first test, and receive and record the second acoustic signal obtained by the logging tool receiver in the second test; a data analysis device configured to process and analyze the acoustic signals received in the two tests to obtain basic measurement data for calibrating the transmitter and receiver in the logging tool.

[0006] Preferably, the system further includes a movable instrument on the acoustic logging tool, wherein the movable instrument is configured to control the movement of each logging tool receiver such that the logging tool receiver corresponding to the measured component is aligned with the standard acoustic transmitter.

[0007] Preferably, the second control device is further configured to control the stopping position of the acoustic logging tool. When the acoustic logging tool is at the lower part of the cylinder, the logging tool transmitter is controlled to emit a reference acoustic signal, and then the reference acoustic signal obtained is received and recorded by the logging tool receivers of each component. The data analysis device calibrates the transmitter and receiver in the logging tool by comparing and analyzing the analyzed basic measurement data with the numerical data corresponding to the reference acoustic signal.

[0008] Preferably, the upper part of the cylinder is a PPR cylinder, the lower part of the cylinder is a metal cylinder, the bottom of the cylinder is sealed by sponge rubber, the top of the cylinder is a detachable metal plate, and the metal plate is wrapped with sponge rubber.

[0009] Preferably, the first control device communicates with the second control device through a synchronization signal line, and the synchronization signal line is used to transmit synchronization signals that meet the emission and reception synchronization requirements in the first test and the second test.

[0010] Preferably, the first control device includes a receiving and communication module. The receiving and communication module includes: a signal receiving and conditioning circuit, which is connected to the standard acoustic wave receiver and is used to receive the first acoustic wave signal and perform filtering processing on the signal; a data acquisition circuit, which is connected to the signal receiving and conditioning circuit and is used to digitize the signal output by the signal receiving and conditioning circuit; a communication interface circuit, which is connected to the data acquisition circuit and is used to pack the received digital data and transfer it to the data analysis device.

[0011] Preferably, the first control device further includes an acoustic wave transmitting module. The acoustic wave transmitting module includes: a transmitting control circuit, which is connected to the data acquisition circuit and is used to generate a transmitting control signal after receiving the transmitting instruction sent by the data acquisition circuit. The transmitting instruction is sent by the data analysis device and transferred to the data acquisition circuit through the communication interface circuit; a constant voltage generating circuit, which is used to generate a specified voltage signal required for acoustic wave transmission; a transmitting driving circuit, which is respectively connected to the transmitting control circuit, the constant voltage generating circuit and the standard acoustic wave transmitter, and is used to convert the specified voltage signal into the second acoustic wave signal under the control of the transmitting control signal and apply the second acoustic wave signal to the standard acoustic wave transmitter so that the standard acoustic wave transmitter can transmit the acoustic wave signal.

[0012] Preferably, the cylinder is filled with an acoustic wave coupling liquid and the acoustic wave coupling liquid is allowed to stand for more than 2 hours before the test is carried out.

[0013] On the other hand, the present invention also provides an acoustic logging calibration method, which is implemented by the acoustic logging calibration system as described above. The acoustic logging calibration method includes: successively deploying a cylinder, a centralizer, an acoustic logging tool, a standard acoustic wave transmitter and a standard acoustic wave receiver required for the logging calibration test, so that the centralizer is located at the upper part of the cylinder, the standard acoustic wave transmitter and the standard acoustic wave receiver are respectively placed at the first mark and the second mark on the inner wall of the cylinder, and the transmitter and receiver in the logging tool are respectively aligned with the standard acoustic wave receiver and the standard acoustic wave transmitter; in the first test, the logging tool transmitter is controlled by the second control device to emit a first acoustic wave signal, and the first control device receives and records the first acoustic wave signal obtained from the standard acoustic wave receiver; in the second test, the first control device controls the standard acoustic wave transmitter to emit a second acoustic wave signal, and the second control device receives and records the second acoustic wave signal obtained from the logging tool receiver; the data analysis device processes and analyzes the acoustic wave signals received in the two tests to obtain the basic measurement data for calibrating the transmitter and receiver in the logging tool.

[0014] Preferably, the acoustic logging calibration method further includes: controlling the staying position of the acoustic logging tool by the second control device. When the acoustic logging tool is at the lower part of the cylinder, the second control device controls the logging tool transmitter to emit a reference acoustic wave signal, and then the logging tool receivers of each component receive and record the obtained reference acoustic wave signal, and calibrate and correct the transmitter and receiver in the logging tool by comparing and analyzing the analyzed basic measurement data with the numerical data corresponding to the reference acoustic wave signal.

[0015] Compared with the prior art, one or more embodiments of the above solution may have the following advantages or beneficial effects:

[0016] The present invention discloses an acoustic logging calibration system and method. The system and method first deploy a test environment for calibrating and correcting the logging tool to be measured to simulate the wellbore and acoustic transmission environment during the actual logging application of the logging tool. Then, a first test and a second test are respectively implemented to collect a first data body and a second data body required for calibrating and correcting the logging tool transmitter and the logging tool receiver, so as to obtain basic measurement data. Next, a logging system is used to control the emission and reception of reference acoustic waves by the logging tool to obtain reference acoustic wave data required for calibration and correction. Finally, by comparing and analyzing the reference measurement data with the basic measurement data, calibration and correction parameters required for calibration and correction are obtained. The present invention can timely correct and calibrate the parameters of the transmitter and receiver in the workshop environment, ensure the accuracy and precision of acoustic logging, and has higher measurement accuracy and precision compared with the semi-circular aluminum groove sound velocity detection and the acoustic amplitude calibration technology in the actual well. Moreover, the calibration and correction test implemented by the present invention can realize the qualitative and quantitative measurement and calibration of the acoustic logging tool even when getting rid of the limitation of the harsh environment.

[0017] Other features and advantages of the present invention will be described in the subsequent description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the description, the claims, and the drawings. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the description. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the acoustic logging calibration system according to the embodiment of the present application.

[0020] Figure 2 is a schematic step diagram of the acoustic logging calibration method according to the embodiment of the present application. Detailed Embodiments

[0021] The following will describe in detail the embodiments of the present invention in conjunction with the accompanying drawings and embodiments, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the implementation process of technical effects and implement accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present invention and the various features in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0022] In addition, the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0023] Currently, the following are several existing calibration techniques for acoustic logging tools: The first one is to place the acoustic logging tool flat in a semi-circular aluminum trough filled with liquid, and use the arrival time of the first wave to calculate the sound velocity respectively, and then compare the calculated sound velocity with the sound velocity of the aluminum trough. This comparison can only be regarded as a kind of detection, and its accuracy and accuracy are relatively low; the second one is to select a free casing for calibration of the acoustic amplitude when performing acoustic amplitude and variable density logging. There are three problems with this calibration: First, the free casing is uncontrollable and not an ideal empty casing; second, the human factor is relatively large and there are relatively large errors; third, the instrument cannot ensure centered measurement and the calibration is also inaccurate; the third one is to place the acoustic logging tool in a water tank for calibration of the tool, but this method requires the water tank to be large enough and deep enough, which is difficult to achieve in the workshop, and it is also impossible to calibrate the sound velocity and the dipole shear wave.

[0024] Nowadays, with the application of multi-component azimuthal receiving and phased azimuthal transmitting technologies, acoustic logging tools are becoming more and more complex and the measurement content is also increasing, but the problem of tool calibration has not been effectively solved. In addition, the transmitters and receivers in acoustic logging tools can only be calibrated by the manufacturers of transmitters and receivers, and it is impossible to perform regular inspections during the use of the tool. As the use time of the tool increases, the parameters of the transmitters and receivers will change. If the parameters of the transmitters and receivers are not corrected and calibrated in time, it will have an adverse impact on the accuracy and precision of acoustic logging.

[0025] Therefore, to solve one or more of the above technical problems, the present application proposes an acoustic logging calibration system and method. Before the test, the system and method first require equipment deployment, specifically including deploying a cylinder and a centralizer device (environment simulation device) for simulating the application environment of the acoustic logging tool, placing the acoustic logging tool to be tested in the environment simulation device, and configuring a standard acoustic transmitter and a standard acoustic receiver for use as calibration references in the cylinder. Then, in the first test, the second control device controls the logging tool transmitter to emit a first acoustic signal, so that the first acoustic signal is transmitted from the logging tool acoustic transmitter to the standard acoustic receiver, and then the first control device receives and records the first acoustic signal to obtain the first data body required for calibrating the transmitter in the logging tool. In the second test, the first control device controls the standard acoustic transmitter to emit a second acoustic signal, so that the second acoustic signal is transmitted from the standard acoustic transmitter to the logging tool receiver, and then the second control device receives and records the second acoustic signal to obtain the second data body required for calibrating the receiver in the logging tool. In addition, the present invention also uses a data analysis device to compare and analyze the data in the first data body and the second data body collected with the digital data corresponding to the reference acoustic signal measured by the internal transmitter and receiver of the acoustic logging tool, so as to calibrate the transmitter and receiver in the logging tool. In this way, the present invention completes the qualitative and quantitative measurement and instrument calibration of the acoustic logging tool in the factory workshop environment, and ensures the accuracy and precision of the acoustic logging through regular calibration tests without environmental restrictions during the use of the instrument.

[0026] It should be noted that the "surface" and "downhole" described in the embodiments of the present invention do not refer to the actual surface and downhole scenarios corresponding to the actual application environment state of the wellbore, but are expressions used to distinguish different acoustic transmission paths in the simulated scenario. The acoustic logging calibration system and method described in the embodiments of the present invention are solutions that can also achieve calibration measurement in the factory workshop environment.

[0027] Figure 1 It is a schematic structural diagram of the acoustic logging calibration system according to the embodiments of the present application. Refer to Figure 1 , the acoustic logging calibration system described in the embodiments of the present invention at least includes: a cylinder 1, a centralizer 8, an acoustic logging tool 4, a standard acoustic transmitter 16, a standard acoustic receiver 15, a first control device 2, a second control device 7, and a data analysis device (not shown).

[0028] In an embodiment of the present invention, the acoustic logging tool 4 is the logging tool that currently needs to be calibrated. The space formed by the cylinder 1 and the centralizer 8 is used to simulate the environment in which the current acoustic logging tool 4 to be detected (calibrated) is located during actual logging applications. The cylinder 1 is a calibration cylinder used to simulate the wellbore. The inner wall of the cylinder 1 is smooth and free of burrs. To ensure good transmission and reception of acoustic signals, the inside of the cylinder 1 is filled with an acoustic coupling liquid 5 (the acoustic coupling liquid 5 is used to simulate the fluid in the wellbore), and before the calibration test is carried out, the filled acoustic coupling liquid needs to be static for more than 2 hours. The acoustic coupling liquid 5 in the cylinder 1 fills the inside of the cylinder 1 as much as possible.

[0029] Further, the cylinder 1 is divided into an upper part and a lower part. The upper part 12 of the cylinder 1 is a PPR cylinder, and the lower part 13 of the cylinder 1 is a metal cylinder. The bottom 14 of the cylinder 1 is sealed by sponge rubber, and the top 11 of the cylinder 1 is a detachable metal plate, which is wrapped with sponge rubber. Specifically, the lower part 13 is a metal cylinder and is made of a high sound velocity material, the upper part 12 is a PPR cylinder and is made of a low sound velocity material, the bottom 14 is sealed by a sound-absorbing and shock-absorbing sponge rubber material, and the top 11 is a detachable metal plate wrapped with sound-absorbing and shock-absorbing sponge rubber. In the metal plate, there are round holes provided, so that the current acoustic logging tool 4 to be detected passes through these round holes. In addition, the upper part 12 of the cylinder 1 is connected to the lower part 13 of the cylinder 1 through a collar seal.

[0030] Further, the centralizer 8 is located in the upper part 12 of the cylinder 1, used to centralize and fix the position of the acoustic logging tool 4, so that the acoustic logging tool 4 is at the center of the inside of the cylinder 1 through the centralizer 8.

[0031] Further, a first mark and a second mark are provided on the inner wall of the upper part 12 of the cylinder 1. The standard acoustic transmitter 16 is arranged at the first mark on the inner wall of the cylinder 1; the standard acoustic receiver 15 is arranged at the second mark on the inner wall of the cylinder 1. Specifically, the standard acoustic transmitter 16 and the standard acoustic receiver 15 are respectively embedded at the first mark and the second mark on the inner wall of the upper part 12 of the cylinder 1, and the shapes of the first mark and the second mark are both fan-shaped. Among them, the standard acoustic transmitter 16 is isolated from the inner wall of the cylinder by a sealed sound-transmitting material, and the standard acoustic receiver is also isolated from the inner wall of the cylinder by a sealed sound-transmitting material. It should be noted that in the embodiment of the present invention, since the standard acoustic transmitter 16 and the standard acoustic receiver 15 are respectively placed at the first mark and the second mark, during actual application, it is necessary to isolate the two standard acoustic devices from the acoustic coupling liquid 5 and ensure electrical insulation. Preferably, the distance between the first mark position and the second mark position is 50 CM or more, and the angle difference between the two mark positions based on the cross-section of the cylinder is 180 degrees. In addition, the standard acoustic transmitter 16 and the standard acoustic receiver 15 do not work simultaneously.

[0032] The acoustic logging tool 4 is located at the center of the cylinder 1 through the centralizer 8. In the actual application process, the acoustic logging tool 4 is usually configured with a logging tool transmitter (not shown) and logging tool receivers in multiple azimuth components (not shown). Among them, each component is configured with a corresponding logging tool receiver.

[0033] In order to obtain the basic measurement data used to calibrate the logging tool transmitter and each logging tool receiver, two types of downhole acoustic transmission paths need to be constructed. The first type of downhole acoustic transmission path is the acoustic transmission path required to obtain the basic measurement data (i.e., the first data body) for calibrating the logging tool transmitter. The first type of downhole acoustic transmission path sequentially includes a logging tool transmitter and a standard acoustic receiver. The second type of downhole acoustic transmission path is the acoustic transmission path required to obtain the basic measurement data (i.e., the second data body) for calibrating the logging tool receivers in each component. The second type of downhole acoustic transmission path sequentially includes a standard acoustic transmitter and the logging tool receiver corresponding to the component to be measured. Therefore, in order to ensure the smoothness of the above two path routes and make the transmitted acoustic signal be transmitted in the corresponding path route according to the principle of minimum attenuation, in the embodiment of the present invention, it is necessary to align the transmitter in the logging tool with the standard acoustic receiver, and use a moving instrument (not shown) configured in the logging tool 4 to align the logging tool receiver to be measured with the standard acoustic transmitter.

[0034] In the embodiment of the present invention, before the first test implementation, it is necessary to connect the acoustic logging tool 4 well, install the centralizer 8 in the cylinder 1 to ensure that the tool 4 is located at the center of the cylinder 1, push the tool 4 into the upper part 12 of the cylinder 1, and align the logging tool transmitter of the tool 4 with the standard acoustic receiver 15 in the cylinder 1 to start the first test. The first test is a test for collecting (obtaining) the basic measurement data required to calibrate the logging tool transmitter. In the first test, after a first acoustic signal is emitted from the logging tool transmitter, the first acoustic signal needs to be transmitted in the first type of downhole acoustic transmission path according to the corresponding transmission path, so that the transmitted first acoustic signal is received by the standard acoustic receiver.

[0035] In an embodiment of the present invention, after the first test is completed and before the second test is implemented, it is necessary to move the instrument to align the logging tool receiver corresponding to the currently measured component in the instrument 4 with the standard acoustic wave transmitter 16 at the upper part 12 of the calibration cylinder 1 to initiate the second test. The second test is a test for collecting (acquiring) the basic measurement data required for calibrating the logging tool receiver. In the second test, after a second acoustic wave signal is emitted from the standard acoustic wave transmitter, the second acoustic wave signal is transmitted along the corresponding transmission path in the second type of downhole acoustic wave transmission path, so that the second acoustic wave signal transmitted is received by the logging tool receiver under the measured azimuth component. Next, continue to move the instrument to align the logging tool receiver corresponding to the next measured component in the instrument 4 with the standard acoustic wave transmitter 16 at the upper part 12 of the calibration cylinder 1 to initiate the second test again until the second test for the logging tool receivers of all components is completed. Thus, in an embodiment of the present invention, the acoustic logging calibration system of the present invention further includes a moving instrument located on the acoustic logging tool 4. The moving instrument is used to control the movement (position migration) of the logging tool receiver under each azimuth component, so that the logging tool receiver corresponding to the currently measured component is aligned with the standard acoustic wave transmitter 16.

[0036] Further, the first control device 2 is respectively connected to the standard acoustic wave transmitter 16 and the standard acoustic wave receiver 15. The first control device 2 is used to receive and record the first acoustic wave signal obtained from the first test, and control the emission of the second acoustic wave signal required for the second test. The second control device 7 is connected to the acoustic logging tool 4. Further, the second control device 7 is respectively connected to the logging tool transmitter in the acoustic logging tool 4 and the logging tool receivers under each component. In an embodiment of the present invention, the second control device 7 integrates a logging system, and is used to control the logging operation of the logging tool 4 through this logging system. Further, the second control device 7 is used to control the emission of the first acoustic wave signal required for the first test, and receive and record the second acoustic wave signal obtained from the second test.

[0037] Furthermore, during the implementation of the first test, the second control device 7 is used to control the logging tool transmitter to emit the first acoustic signal required for the current test in the first test. The first acoustic signal is directly transmitted to the standard acoustic receiver 15 via the logging tool transmitter. At this time, the first control device 2 is used to receive and record the first acoustic signal obtained by the standard acoustic receiver 15 in the first test. During the implementation of the second test, the first control device 2 is used to control the standard acoustic transmitter to emit the second acoustic signal required for the current test in the second test. The second acoustic signal is directly transmitted to the logging tool receiver corresponding to the current azimuth component to be measured via the standard acoustic transmitter 16. At this time, the second control device 7 is used to receive and record the second acoustic signal obtained by the logging tool receiver corresponding to the current azimuth component to be measured in the second test. In this way, after collecting (acquiring) the second acoustic signals of all components, the above-mentioned first test and second test are completed.

[0038] The data analysis device (not shown) includes two parts: a first analysis module and a second analysis module. The second analysis module is integrated in the second control device 7. Refer to Figure 1 , and the first analysis module 3 is connected to the first control device 2. In the embodiment of the present invention, the data analysis device is used to process and analyze the first acoustic signal received in the first test and the second acoustic signal received in the second test to obtain the basic measurement data for calibrating the transmitter and receiver in the logging tool. Specifically, the first analysis module 3 is used to process and analyze the received first acoustic signal. After digitally processing the first acoustic signal, it extracts the characteristic information such as the amplitude, phase, and spectrum of the digital first acoustic signal to obtain the first data body. At the same time, the second analysis module is used to process and analyze the received second acoustic signal. After digitally processing the second acoustic signal, it extracts the characteristic information such as the amplitude, phase, and spectrum of the digital second acoustic signal to obtain the second data body. In this way, the embodiment of the present invention obtains all the basic measurement data required for qualitatively and quantitatively calibrating the acoustic logging instrument 4, that is, the first data body and the second data body.

[0039] In addition, the second control device 7 described in the embodiments of the present invention is further configured to control the staying position of the acoustic logging tool 4. Among them, when acquiring the basic measurement data required for tool calibration (in the first test and second test phases), the second control device 7 controls the acoustic logging tool 4 to stay within the upper part 12 of the cylinder 1; when acquiring the reference data required for tool calibration, the second control device 7 needs to control the acoustic logging tool 4 to stay within the lower part 13 of the cylinder 1. That is to say, after obtaining the basic measurement data, it is necessary to enter the reference data collection phase. At this time, the acoustic logging tool 4 needs to be pushed into the lower part 13 of the calibration cylinder 1 so that the logging system configured in the second control device 7 can control the emission and reception of the reference acoustic signals of the logging tool 4.

[0040] Furthermore, when the acoustic logging tool 4 is located within the lower part 13 of the cylinder 1, the second control device 7 is used to control the logging tool transmitter to emit reference acoustic signals through the logging system, and then the logging tool receivers of each azimuth component receive and record the obtained reference acoustic signals. Then, the second analysis module in the second control device 7 is further used to perform data processing and analysis on the received reference acoustic signals. After digitalizing the reference acoustic signals, characteristic information such as the amplitude, phase, and frequency spectrum of the digitalized reference acoustic signals is extracted to obtain reference acoustic data. Among them, the first analysis module 3 in the data analysis device performs comparative analysis on the transmitter and receiver in the logging tool by comparing and analyzing the above-mentioned analyzed basic measurement data with the digitalized data (reference acoustic data) corresponding to the received reference acoustic signals.

[0041] In the embodiments of the present invention, the first analysis module 3 in the data analysis device uses an industrial computer equipped with data analysis software. It is not only used to process and analyze the received first acoustic signals to obtain the first data volume, but also acquires and collects the second data volume and reference acoustic data from the second control device 7, and further performs comparative analysis and normalization calculation on the basic measurement data and reference acoustic data to obtain calibration correction parameters including acoustic amplitude, acoustic phase, acoustic frequency spectrum, and acoustic travel time, etc., so as to calibrate the calibration of the logging tool transmitter and logging tool receiver in the actual logging application process of the logging tool 4 using the calibration correction parameters obtained from the current calibration measurement.

[0042] Further, the acoustic logging calibration system according to the embodiment of the present invention further includes: a synchronization signal line 6. In the embodiment of the present invention, the first control device 2 communicates with the second control device 7 through the synchronization signal line 6. Among them, the synchronization signal line is used to transmit the synchronization signals that meet the requirements of transmission and reception synchronization in the first test and the second test. That is to say, since the control objects of acoustic wave transmission and acoustic wave reception are different in the first test and the second test, in order to ensure the time synchronization of transmission and reception, the embodiment of the present invention ensures the synchronization of transmission and reception through the transmission of synchronization signals between the first control device 2 and the second control device 7.

[0043] Furthermore, in the embodiment of the present invention, the normal communication between the first control device 2 and the second control device 7 is also ensured through the synchronization signal line 6, so as to complete the mutual transmission of data, signals and instructions. Thus, in the embodiment of the present invention, the second control device 7 is further configured to transmit the obtained second data body and / or reference acoustic wave data to the first control device 2 through the synchronization signal line 6, and then the first control device 2 forwards the second data body and / or reference acoustic wave data to the first analysis module 3, so as to be utilized by the first analysis module 3 for data analysis to obtain corresponding calibration correction parameters.

[0044] Further, continuing to refer to Figure 1 , the first control device 2 according to the embodiment of the present invention includes a receiving and communication module (not numbered) and an acoustic wave transmitting module (not numbered). Among them, the receiving and communication module includes: a signal receiving and conditioning circuit 21, a data acquisition circuit 25, and a communication interface circuit 26.

[0045] Specifically, the signal receiving and conditioning circuit 21 is connected to the standard acoustic wave receiver 15. The signal receiving and conditioning circuit 21 adopts a programmed receiving amplification and attenuation filtering circuit, which is used to receive the first acoustic wave signal obtained in the first test process and perform signal amplification and attenuation filtering processing on the first acoustic wave signal. The data acquisition circuit 25 is connected to the signal receiving and conditioning circuit 21. The data acquisition circuit 25 adopts a DSP acquisition and control circuit, which is used to perform DSP digital processing on the signal output from the signal receiving and conditioning circuit 21. The communication interface circuit 26 is connected to the data acquisition circuit 25. The communication interface circuit 26 adopts a network communication interface circuit, which is used to package the digital data output from the data acquisition circuit 25 and transmit it to the data analysis device (the first analysis module 3).

[0046] During the first test process, the acoustic logging tool 4 powers the logging tool transmitter through the logging system 7 and controls it to emit acoustic signals. The standard acoustic receiver 15 receives the acoustic signals, and the received acoustic signals are sent to the programmable receiving amplification and attenuation filtering circuit 21 for signal attenuation processing. Then the signals enter the DSP acquisition and control circuit 25 for digital processing. The digital signals are packed by the network communication interface circuit 26 and transmitted to the first analysis module 3 for recording and analysis processing.

[0047] Furthermore, the acoustic wave transmitting module includes: a transmitting control circuit 24, a constant voltage generating circuit 23, and a transmitting driving circuit 22. The transmitting control circuit 24 is connected to the data acquisition circuit 25. The transmitting control circuit 24 adopts a CPLD transmitting control circuit, which is used to generate a transmitting control signal after receiving the transmitting instruction sent by the data acquisition circuit 25. Among them, the transmitting instruction is issued by the first analysis module 3 in the data analysis device and transmitted to the data acquisition circuit 25 through the communication interface circuit 26. The constant voltage generating circuit 23 is used to generate the specified voltage signal required for acoustic wave transmission. The transmitting driving circuit 22 is respectively connected to the transmitting control circuit 24, the constant voltage generating circuit 23, and the standard acoustic wave transmitter 16. The transmitting driving circuit 22 is used to convert the specified voltage signal into a second acoustic wave signal under the control of the transmitting control signal, and apply the second acoustic wave signal to the standard acoustic wave transmitter 16 so that the standard acoustic wave transmitter 16 emits acoustic signals.

[0048] During the second test process, the first analysis module 3 sends the transmitting instruction to the DSP acquisition and control circuit 25 through the network communication interface circuit 26. This circuit controls the CPLD transmitting control circuit 24 to generate a transmitting control signal. After being driven by the transmitting driving circuit 22, the transmitting control signal applies the specified voltage generated by the constant voltage transmitting circuit 23 to the standard acoustic wave transmitter 16 in the upper part 12 of the calibration cylinder 1 to make it emit acoustic signals, synchronously controls the acoustic logging tool to receive and acquire acoustic signals, and the logging system 7 records them and the second analysis module performs analysis processing.

[0049] On the other hand, based on the above acoustic logging calibration system, an embodiment of the present invention further provides an acoustic logging calibration method, which is implemented by the above-mentioned acoustic logging calibration system. Figure 2 It is a schematic diagram of the steps of the acoustic logging calibration method of the embodiment of the present application.

[0050] As Figure 2As shown in the figure, the acoustic logging calibration method according to the embodiments of the present invention includes the following steps: Step S210 sequentially deploys a cylinder, a centralizer, an acoustic logging tool, a standard acoustic transmitter, and a standard acoustic receiver required for the current logging calibration test, such that the centralizer is located at the upper part of the cylinder, the standard acoustic transmitter and the standard acoustic receiver are respectively placed at the first mark and the second mark on the inner wall of the cylinder, and the transmitters and receivers in the logging tool are respectively aligned with the standard acoustic receiver and the standard acoustic transmitter; Step S220 in the first test, the second control device controls the logging tool transmitter to emit a first acoustic signal, and the first control device receives and records the first acoustic signal obtained from the standard acoustic receiver; Step S230 in the second test, the first control device controls the standard acoustic transmitter to emit a second acoustic signal, and the second control device receives and records the second acoustic signal obtained from the logging tool receiver; Step S240 the data analysis device processes and analyzes the acoustic signals received in the two tests to obtain the basic measurement data for calibrating the transmitters and receivers in the logging tool.

[0051] Furthermore, the above acoustic logging calibration method further includes: the second control device controls the staying position of the acoustic logging tool. Wherein, when the acoustic logging tool is at the lower part of the cylinder, the second control device controls the logging tool transmitter to emit a reference acoustic signal, and then each component of the logging tool receiver receives and records the obtained reference acoustic signal, and the transmitters and receivers in the logging tool are calibrated by comparing and analyzing the analyzed basic measurement data with the numerical data corresponding to the reference acoustic signal.

[0052] The present invention discloses an acoustic logging calibration system and method. The system and method first deploy a test environment for calibrating the logging tool to be measured to simulate the wellbore and acoustic transmission environment during the actual logging application of the logging tool; then, the first test and the second test are respectively implemented to collect the first data volume and the second data volume required for calibrating the logging tool transmitter and the logging tool receiver, so as to obtain the basic measurement data; then, the logging system is used to control the emission and reception of the reference acoustic wave of the logging tool to obtain the reference acoustic wave data required for calibration; finally, by comparing and analyzing the reference measurement data with the basic measurement data, the calibration parameters required for calibration are obtained. The present invention can timely correct and calibrate the parameters of the transmitter and receiver in the workshop environment, ensure the accuracy and precision of acoustic logging, and has higher measurement accuracy and precision compared with the semi-circular aluminum groove sound velocity detection and the acoustic amplitude calibration technology in the actual well. Moreover, the calibration test implemented by the present invention can realize the qualitative and quantitative measurement and calibration of the acoustic logging tool even when getting rid of the restriction of the harsh environment.

[0053] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

[0054] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are for the purpose of describing specific embodiments only and do not mean to limit.

[0055] The phrase "an embodiment" or "embodiments" mentioned in the specification means that the specific features, structures or characteristics described in connection with the embodiments are included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment" or "embodiments" that appear throughout the specification do not necessarily all refer to the same embodiment.

[0056] Although the embodiments disclosed in the present invention are as above, the content described is only an embodiment for facilitating the understanding of the present invention and is not used to limit the present invention. Any person skilled in the technical field to which the present invention pertains, without departing from the spirit and scope disclosed by the present invention, may make any modifications and changes in the form of implementation and details, but the patent protection scope of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. An acoustic logging calibration system, comprising: A cylinder; A centralizer located at the upper part of the cylinder; A standard acoustic transmitter disposed at a first mark on the inner wall of the cylinder; A standard acoustic receiver disposed at a second mark on the inner wall of the cylinder; An acoustic logging tool located at the center of the cylinder through the centralizer, wherein the transmitter in the acoustic logging tool is aligned with the standard acoustic receiver, and the receiver in the acoustic logging tool is aligned with the standard acoustic transmitter; A first control device for receiving and recording a first acoustic signal obtained by the standard acoustic receiver in a first test, and controlling the standard acoustic transmitter to emit a second acoustic signal in a second test; A second control device for controlling the transmitter of the acoustic logging tool to emit the first acoustic signal in a first test, and receiving and recording the second acoustic signal obtained by the receiver of the acoustic logging tool in a second test, wherein the first control device communicates with the second control device through a synchronization signal line; A data analysis device for processing and analyzing the acoustic signals received in the two tests to obtain basic measurement data for calibrating the transmitter and receiver in the acoustic logging tool; A mobile instrument located on the acoustic logging tool, wherein the mobile instrument is used to control the movement of each receiver of the acoustic logging tool so that the receiver of the acoustic logging tool corresponding to the measured component is aligned with the standard acoustic transmitter, wherein, The first control device includes: a receiving and communication module and an acoustic wave transmitting module, wherein, The receiving and communication module includes: A signal receiving and conditioning circuit connected to the standard acoustic receiver for receiving the first acoustic signal and filtering the signal; A data acquisition circuit connected to the signal receiving and conditioning circuit for digitizing the signal output by the signal receiving and conditioning circuit; A communication interface circuit connected to the data acquisition circuit for packing the received digitized data and transmitting it to the data analysis device; The acoustic wave transmitting module includes: A transmitting control circuit connected to the data acquisition circuit for generating a transmitting control signal after receiving a transmitting instruction sent by the data acquisition circuit, wherein the transmitting instruction is sent by the data analysis device and transmitted to the data acquisition circuit through the communication interface circuit; A constant voltage generating circuit for generating a specified voltage signal required for acoustic wave transmission; A transmitting driving circuit connected to the transmitting control circuit, the constant voltage generating circuit and the standard acoustic transmitter respectively, for converting the specified voltage signal into the second acoustic signal under the control of the transmitting control signal, and applying the second acoustic signal to the standard acoustic transmitter for transmitting the acoustic signal by the standard acoustic transmitter.

2. The acoustic logging calibration system according to claim 1, wherein The second control device is further configured to control the staying position of the acoustic logging tool. When the acoustic logging tool is located at the lower part of the cylinder, the second control device controls the acoustic logging tool transmitter to emit a reference acoustic wave signal, and then each component of the acoustic logging tool receiver receives and records the obtained reference acoustic wave signal. Among them, The data analysis device performs calibration correction on the transmitter and receiver in the acoustic logging tool by comparing and analyzing the analyzed basic measurement data with the numerical data corresponding to the reference acoustic wave signal.

3. The acoustic logging calibration system according to claim 1 or 2, wherein The upper part of the cylinder is a PPR cylinder, the lower part of the cylinder is a metal cylinder, the bottom of the cylinder is sealed by sponge rubber, the top of the cylinder is a detachable metal plate, and the metal plate is wrapped with sponge rubber.

4. The acoustic logging calibration system according to claim 1 or 2, characterized in that, The synchronous signal line is used to transmit synchronous signals that meet the requirements of emission and reception synchronization in the first test and the second test.

5. The acoustic logging calibration system according to claim 1 or 2, characterized in that The cylinder is filled with acoustic coupling liquid, and the acoustic coupling liquid is allowed to stand for more than 2 hours before the test is implemented.

6. A method for calibrating acoustic logging, characterized in that, The method is implemented by the acoustic logging calibration system according to any one of claims 1 to 5. The acoustic logging calibration method includes: Sequentially deploying the cylinder, the centralizer, the acoustic logging tool, the standard acoustic wave transmitter, and the standard acoustic wave receiver required for the logging calibration test, such that the centralizer is located at the upper part of the cylinder, the standard acoustic wave transmitter and the standard acoustic wave receiver are respectively placed at the first mark and the second mark on the inner wall of the cylinder, and the transmitter and receiver in the acoustic logging tool are respectively aligned with the standard acoustic wave receiver and the standard acoustic wave transmitter; In the first test, the second control device controls the acoustic logging tool transmitter to emit a first acoustic wave signal, and the first control device receives and records the first acoustic wave signal obtained from the standard acoustic wave receiver; In the second test, the first control device controls the standard acoustic wave transmitter to emit a second acoustic wave signal, and the second control device receives and records the second acoustic wave signal obtained from the acoustic logging tool receiver; The data analysis device processes and analyzes the acoustic wave signals received in the two tests to obtain basic measurement data for calibrating the transmitter and receiver in the acoustic logging tool.

7. The acoustic logging calibration method according to claim 6, characterized in that, The acoustic logging calibration method further includes: The second control device controls the staying position of the acoustic logging tool. When the acoustic logging tool is located at the lower part of the cylinder, the second control device controls the acoustic logging tool transmitter to emit a reference acoustic wave signal, and then each component of the acoustic logging tool receiver receives and records the obtained reference acoustic wave signal, and calibration correction is performed on the transmitter and receiver in the acoustic logging tool by comparing and analyzing the analyzed basic measurement data with the numerical data corresponding to the reference acoustic wave signal.

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