Laboratory testing system for ultrasonic transducer

Abstract

The invention belongs to the technical field of oil and gas well shaft integrity detection, and discloses a laboratory testing system for an ultrasonic transducer. The inner wall of the test water tank is provided with a positioning clamping groove with a plurality of adjusting gears; the adjustable displacement device is arranged in the test water tank and is used for fixing the ultrasonic transducer and driving the ultrasonic transducer to move and position in the test water tank transversely and longitudinally; the sleeve section is detachably mounted in the positioning clamping groove and is opposite to the ultrasonic transducer; a transmission circuit module, an acquisition circuit module and a control circuit module connected with the transmission circuit module and the acquisition circuit module are integrated in the case; the upper computer is connected with the control circuit module through a first communication interface and connected with the adjustable displacement device through a second communication interface; and the slurry circulating system is used for replacing a test liquid medium and avoiding cross contamination among different kinds of slurry. The system can highly simulate the underground environment, the test function is more comprehensive, and the operation is more convenient and efficient.

Description

Technical Field

[0001] This invention relates to the field of oil and gas wellbore integrity testing technology, specifically to a laboratory testing system for ultrasonic transducers. Background Technology

[0002] As a core component of ultrasonic imaging logging instruments, the ultrasonic transducer combines the functions of emitting sound waves and receiving reflected waves. Its performance directly determines the accuracy and reliability of the logging instrument in areas such as casing inner wall inspection, wall thickness measurement, and cementing quality evaluation. For example, parameters such as the transducer's center frequency, bandwidth, sensitivity, and resonance efficiency have a decisive impact on the propagation characteristics of sound waves in the wellbore medium and the signal-to-noise ratio of the echo signal. Therefore, accurate and comprehensive performance testing and calibration of the ultrasonic transducer in a laboratory environment is a crucial prerequisite for ensuring its normal operation after being run into the well.

[0003] Currently, the laboratory technologies and equipment used for testing ultrasonic transducers mainly fall into the following categories, but none of them can meet the requirements for high-fidelity simulation of the downhole working environment: 1) General-purpose ultrasonic transducer testing system: This type of system is mainly designed for transducers used in civilian fields such as industrial ultrasonic flow meters, medical ultrasonic probes, or gas meters. Its testing functions are typically limited to measuring basic electroacoustic parameters, such as impedance characteristics, resonant frequency, and static capacitance. Its inherent limitations are: the testing environment is singular, usually conducted in air or a simple water tank, making it impossible to simulate the complex acoustic environment downhole (such as mud of different densities, enormous hydrostatic pressure, etc.); furthermore, the lack of standardized wellbore simulation targets makes it impossible to study the propagation and reflection patterns of sound waves in casings of different sizes and wall thicknesses. Therefore, its test results have a weak correlation with the actual performance of the transducer in real downhole applications.

[0004] 2) Ultrasonic Testing System Based on Water Immersion Method: This method involves immersing the transducer and the test specimen (such as a steel plate) in water for testing, a common practice in laboratories. However, its shortcomings include: Insufficient environmental simulation capability: Using only clean water as the coupling medium, it cannot simulate the effects of various types and densities of drilling mud on sound wave attenuation and sound velocity. Limited positioning and scanning accuracy: The position adjustment between the transducer and the test specimen largely relies on manual operation, resulting in poor positioning accuracy and repeatability. It is difficult to accurately reproduce and systematically study the impact of the critical working condition of downhole instrument "eccentricity" on the measurement signal. Cumbersome operation and low efficiency: Changing the test medium or adjusting the target position requires manual intervention, which is time-consuming and labor-intensive, and it is difficult to ensure the consistency of experimental conditions for each test.

[0005] 3) Lack of integrated dedicated downhole simulation equipment: Although some testing concepts exist for the petroleum industry, existing commercial equipment or laboratory solutions generally lack a highly integrated and automated system. Specifically: Lack of programmable excitation and acquisition systems: The frequency, power, and pulse width of the transmitted waveform cannot be flexibly adjusted to adapt to the needs of different logging algorithms. Furthermore, the sampling rate and accuracy of the acquisition system may not meet the processing requirements of high-frequency ultrasonic signals. Lack of multi-specification wellbore simulation targets: There is no systematic provision of arc-shaped casing sections of various sizes and wall thicknesses, failing to comprehensively cover the wellbore specifications that may be encountered in the field. Lack of convenient mud environment switching capabilities: The lack of an integrated mud circulation and replacement system makes experiments studying the effects of different mud properties on logging extremely difficult and messy, and highly susceptible to cross-contamination of different mud samples.

[0006] In summary, the common problems of existing technologies can be attributed to the following: the testing environment is too idealized and out of touch with the complex working conditions downhole; the testing functions are limited and cannot meet the needs of systematically evaluating the performance of transducers under multiple variables (well diameter, wall thickness, mud, eccentricity) in the development of logging instruments; and the low degree of automation leads to low testing efficiency and poor data comparability. Therefore, there is an urgent need in this field for a laboratory testing system for ultrasonic transducers that can highly simulate the downhole environment, has comprehensive testing functions, and is easy and efficient to operate, in order to fill the gap in existing technologies. Summary of the Invention

[0007] In view of the above problems, the present invention proposes an ultrasonic transducer laboratory testing system that overcomes or at least partially solves the above problems.

[0008] According to an embodiment of the present invention, an ultrasonic transducer laboratory testing system includes: a test water tank for containing a liquid medium to simulate a downhole liquid environment, wherein a positioning slot with multiple adjustment levels is provided on the inner wall of the test water tank; an adjustable displacement device installed inside the test water tank, wherein an ultrasonic transducer is fixed on the adjustable displacement device, the adjustable displacement device being configured to drive the ultrasonic transducer to move and position laterally and longitudinally within the test water tank; a casing section detachably installed in the positioning slot and positioned opposite to the ultrasonic transducer, wherein different specifications of casing sections are selected and the installation of the casing sections in different adjustment levels in the positioning slot are adjusted to simulate wellbore environments with casing sections of different sizes and wall thicknesses and different relative distances between the casing sections and the ultrasonic transducer; and a chassis electrically connected to the ultrasonic transducer, wherein the chassis integrates a device for emitting excitation current to the ultrasonic transducer. The system includes a transmitting circuit module for excitation signals, an acquisition circuit module for receiving echo signals from the ultrasonic transducer and performing preprocessing and analog-to-digital conversion, and a control circuit module connected to both the transmitting and acquisition circuit modules. A host computer is connected to the control circuit module via a first communication interface to send transmission parameters and acquisition commands, and to receive acquisition data from the control circuit module. Simultaneously, the host computer is connected to an adjustable displacement device via a second communication interface to send position control commands to adjust the spatial position of the ultrasonic transducer, and to process, display, and store the received acquisition data. A mud circulation system is also included, connected via pipelines to the inlet and outlet of the test water tank to pump external mud into or out of the test water tank, thereby replacing the test liquid medium and preventing cross-contamination between different muds.

[0009] Furthermore, the control circuit module is configured to: send a transmission enable signal and waveform parameter instructions to the transmitting circuit module to control it to generate a high-voltage excitation pulse with a specific frequency and duty cycle; send a acquisition trigger signal and sampling parameter instructions to the acquisition circuit module to control it to start high-speed sampling at a specific delay after the transmitting circuit module emits the ultrasonic wave and before the echo signal arrives; and receive the digital echo signal converted by the acquisition circuit module, and perform preliminary buffering and format conversion on the signal.

[0010] Furthermore, the chassis also integrates: a power supply module, which is used to connect to an external AC power supply and convert it into the low-voltage DC power required by the system to power the transmitting circuit module, the acquisition circuit module, and the control circuit module; and a voltage conversion module, whose input terminal is electrically connected to the low-voltage DC power output of the power supply module, which is used to convert the low-voltage DC power supply into a stable high-voltage DC signal and provide working power for the transmitting circuit module.

[0011] Furthermore, the adjustable displacement device includes: a lateral motion unit, a longitudinal motion unit, and a transducer clamp installed in the test water tank. The lateral motion unit includes a lateral guide rail fixed in the test water tank, a lateral slider cooperating with the lateral guide rail, and a lateral drive motor for driving the lateral slider. The longitudinal motion unit includes a longitudinal guide rail fixedly installed on the lateral slider, a longitudinal slider cooperating with the longitudinal guide rail, and a longitudinal drive motor for driving the longitudinal slider. The transducer clamp is fixedly installed on the longitudinal slider. The lateral drive motor and the longitudinal drive motor are respectively connected to a host computer and receive its position control commands, thereby driving the lateral slider and the longitudinal slider to move, so as to drive the ultrasonic transducer to make precise displacement in the horizontal and vertical directions.

[0012] Furthermore, each adjustment position is arranged horizontally along the test water tank. Each adjustment position includes a first vertical groove and a second vertical groove fixed on two opposite side walls of the test water tank. The two ends of the sleeve section are detachably connected to the first vertical groove and the second vertical groove. By selectively snapping the sleeve section into different adjustment positions, the relative distance between the sleeve section and the ultrasonic transducer can be changed.

[0013] Furthermore, the test tank is made of thick stainless steel plate to shield against external signal interference.

[0014] Furthermore, the casing section includes various sizes of curved casing and flat steel plates, ranging from 5 inches to 22 inches in size and 0.5 cm to 3.2 cm in wall thickness.

[0015] Furthermore, the host computer includes: a probe control module, used to send position control commands to the adjustable displacement device through a second communication interface to adjust the spatial position of the ultrasonic transducer; a data processing module, used to receive acquired data from the control circuit module through a first communication interface, and process and analyze the acquired data to calculate the wall thickness of the sleeve section, the resonance efficiency of the ultrasonic transducer, and generate a spectrum diagram of the echo signal; a data storage module, used to store system configuration parameters, acquired echo data, and processing results from the data processing module; and a data display module, used to display in real time the echo waveform, spectrum analysis diagram, wall thickness measurement value, resonance efficiency parameter, and position information of the ultrasonic transducer output by the data processing module.

[0016] Furthermore, the host computer is also equipped with ultrasonic scanning measurement and analysis software. The ultrasonic scanning measurement and analysis software integrates the functions of probe control module, data processing module, data storage module and data display module, and provides one-click measurement of mud sound velocity, as well as automatic positioning center and eccentric scanning measurement function for arc-shaped casing sections.

[0017] Furthermore, the mud circulation system includes a peristaltic pump and a replaceable pump tube. The test tank has an outlet / inlet connected to the replaceable pump tube. The peristaltic pump is configured to have a pumping mode and an inlet mode. After the liquid in the test tank is pumped out in the pumping mode, the liquid is replaced in the inlet mode to achieve the circulation and replacement of mud in the test tank. When it is necessary to change the type of mud, the replaceable pump tube is replaced to avoid cross-contamination of different muds in the system.

[0018] Compared with existing technologies, the ultrasonic transducer laboratory testing system of this invention overcomes the fatal flaws of traditional commercial devices, such as limited functionality and inability to simulate complex real downhole environments. It simulates diverse wellbore structures through an integrated test water tank and multi-specification casing sections, achieves automatic positioning and eccentric scanning through a high-precision adjustable displacement device and host computer, and solves the problems of convenience and contamination in multi-media testing through a mud circulation system. Thus, it forms a comprehensive testing platform with realistic environmental simulation, comprehensive test parameters, high degree of automation, and accurate and reliable data, effectively meeting the urgent need for systematic and condition-based calibration and verification of ultrasonic transducers in the development of logging instruments. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of an ultrasonic transducer laboratory testing system according to an embodiment of the present invention is shown; Figure 2 It shows Figure 1 The diagram shows the internal structure of the test water tank. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0021] Figure 1 The structure of an ultrasonic transducer laboratory testing system 100 according to an embodiment of the present invention is shown. Figure 1 As shown, the ultrasonic transducer laboratory testing system 100 may include: a test water tank 3 for containing a liquid medium to simulate a downhole liquid environment, combined with... Figure 2As shown, the inner wall of the test water tank 3 is provided with a positioning slot 35 with multiple adjustment positions; an adjustable displacement device 31 is installed inside the test water tank 3, and the ultrasonic transducer 32 is fixed on the adjustable displacement device 31. The adjustable displacement device 31 is configured to drive the ultrasonic transducer 32 to move and position laterally and longitudinally within the test water tank 3; a casing section 33 is detachably installed in the positioning slot 35 and positioned opposite to the ultrasonic transducer 32. By selecting different specifications of the casing section 33 and adjusting the installation of the casing section 33 at different adjustment positions in the positioning slot 35, well environments with different sizes and wall thicknesses of casing sections 33 and different relative distances between the casing section 33 and the ultrasonic transducer 32 can be simulated; a chassis 2 is electrically connected to the ultrasonic transducer 32, and the chassis 2 can integrate a transmitting circuit module 23 for transmitting excitation electrical signals to the ultrasonic transducer 32. The system includes an acquisition circuit module 24 that receives echo signals from the ultrasonic transducer 32 and performs preprocessing and analog-to-digital conversion, and a control circuit module 25 that is connected to both the transmission circuit module 23 and the acquisition circuit module 24; a host computer 1 that is connected to the control circuit module 25 via a first communication interface to send transmission parameters and acquisition commands to the control circuit module 25 and receive acquisition data from the control circuit module 25; simultaneously, the host computer 1 is connected to an adjustable displacement device 31 via a second communication interface to send position control commands to adjust the spatial position of the ultrasonic transducer 32, and to process, display, and store the received acquisition data; and a mud circulation system 4 that is connected to the inlet and outlet of the test water tank 3 via pipelines to pump external mud into or out of the test water tank 3 to replace the test liquid medium and avoid cross-contamination between different muds.

[0022] In operation, the ultrasonic transducer laboratory testing system 100 of this invention allows the operator to insert a selected casing section 33 into a specific position on the positioning slot 35 inside the test water tank 3, and inject specific mud into the test water tank 3 through the mud circulation system 4. Subsequently, the host computer 1 issues commands: on the one hand, it coordinates the transmitting circuit module 23 via the control circuit module 25 to generate a high-voltage pulse to drive the ultrasonic transducer 32 to emit ultrasonic waves, and commands the acquisition circuit module 24 to acquire the echo after a precise delay; on the other hand, the host computer 1 controls the adjustable displacement device 31 to move the ultrasonic transducer 32 to the target position. The echo signal is acquired by the chassis 2, preliminarily processed, and then uploaded to the host computer 1 for final analysis, display, and storage. By changing the casing section 33, the position of the positioning slot 35, the position of the ultrasonic transducer 32, and the type of mud, various well condition simulation tests can be systematically completed.

[0023] The advantages of the ultrasonic transducer laboratory testing system 100 in this invention lie in its high degree of integration and simulation realism. It is no longer a single-function test bench, but a flexibly configurable downhole condition simulator. It uses controllable mechanical positioning to simulate the spatial relationship between the casing section 33 and the ultrasonic transducer 32, uses programmable electrical signal excitation and acquisition to generate and capture sound waves, and uses the host computer 1 to extract physical parameters reflecting the transducer performance and wellbore condition from the echo signal. It integrates environmental simulation, precision control, signal processing and mud management, and can systematically and faithfully reproduce complex downhole conditions (such as different well diameters, casing thicknesses, mud types, eccentricity, etc.). It solves the problems of single function and insufficient environmental simulation capability of existing technologies, and greatly improves the comprehensiveness and efficiency of testing.

[0024] According to a preferred embodiment of the present invention, the control circuit module 25 can be configured to: send a transmission enable signal and waveform parameter instructions to the transmitting circuit module 23 to control it to generate a high-voltage excitation pulse with a specific frequency and duty cycle; send a acquisition trigger signal and sampling parameter instructions to the acquisition circuit module 24 to control it to start high-speed sampling at a specific delay after the transmitting circuit module transmits the ultrasonic wave and before the echo signal arrives; and receive the digital echo signal converted by the acquisition circuit module 24, and perform preliminary buffering and format conversion on the signal. This embodiment can achieve nanosecond-level high-precision synchronous control through hardware logic (FPGA / DSP), ensuring strict matching of the transmission and acquisition timing, thereby guaranteeing the accuracy of ultrasonic time-of-flight measurement and providing a strong guarantee for realizing functions such as high-precision wall thickness measurement.

[0025] In such Figure 1 In the preferred embodiment shown, the chassis 2 may also integrate: a power module 21 for connecting to an external AC power source and converting it into the low-voltage DC power required by the system to power the transmitting circuit module 23, the acquisition circuit module 24, and the control circuit module 25; and a voltage conversion module 22, whose input is electrically connected to the low-voltage DC power output from the power module 21, for converting the low-voltage DC power into a stable high-voltage DC signal and providing operating power to the transmitting circuit module 23. Through the built-in integrated power architecture, a stable, reliable, and isolated energy supply is provided. The voltage conversion module 22 is dedicated to powering the transmitting circuit module 23, ensuring the strength of the excitation signal. Simultaneously, the internal conversion reduces external devices, improving the system's integration, security, and anti-interference capabilities.

[0026] In a preferred embodiment, the adjustable displacement device 31 may include: a lateral motion unit, a longitudinal motion unit, and a transducer clamp installed in the test water tank 3. The lateral motion unit includes a lateral guide rail fixed in the test water tank 3, a lateral slider cooperating with the lateral guide rail, and a lateral drive motor for driving the lateral slider. The longitudinal motion unit includes a longitudinal guide rail fixedly installed on the lateral slider, a longitudinal slider cooperating with the longitudinal guide rail, and a longitudinal drive motor for driving the longitudinal slider. The transducer clamp is fixedly installed on the longitudinal slider. The lateral drive motor and the longitudinal drive motor are electrically connected to the host computer 1, receiving its position control commands to drive the lateral and longitudinal sliders to move, thereby causing the ultrasonic transducer 32 to perform precise displacement in the horizontal and vertical directions. This embodiment achieves programmed and automated two-dimensional precision positioning of the ultrasonic transducer 32 (accuracy up to 0.5mm), replacing traditional manual adjustment. It provides the necessary hardware foundation for advanced functions such as automatic center positioning and eccentric scanning mentioned later, ensuring the repeatability and accuracy of position control.

[0027] In such Figure 2 In the preferred embodiment shown, each adjustment position can be arranged laterally along the test water tank 3. Each adjustment position can include a first vertical groove 351 and a second vertical groove 352 fixed on two opposite side walls of the test water tank 3. The two ends of the sleeve section 33 are detachably connected to the first vertical groove 351 and the second vertical groove 352. By selectively engaging the sleeve section 33 in different adjustment positions, the relative distance between the sleeve section 33 and the ultrasonic transducer 32 can be changed. This embodiment provides a fast, discrete, and repeatable distance adjustment reference through a simple mechanical engagement structure, enabling simulation of a wide range of distance changes and facilitating operation.

[0028] Preferably, such as Figure 2 As shown, the positioning slot 35 can be provided with nine adjustment positions, and the distance between adjacent adjustment positions is equal, preferably 10mm, for more precise adjustment of the distance between the sleeve section 33 and the ultrasonic transducer 32.

[0029] In a preferred embodiment, such as Figure 2 As shown, the tank 34 of the test water tank 3 can be made of thick stainless steel plate to shield against external signal interference. Using thick stainless steel plate can easily and effectively shield against external electromagnetic and acoustic noise interference, providing a quiet laboratory environment for high-frequency ultrasonic signal acquisition, significantly improving the signal-to-noise ratio of the echo signal and the reliability of the test results. Preferably, the thickness of the stainless steel plate is 50 mm.

[0030] According to the present invention, the casing section 33 may include arc-shaped casing and flat steel plates of various sizes, ranging from 5 inches to 22 inches, with wall thicknesses from 0.5 cm to 3.2 cm. The ultrasonic transducer laboratory testing system 100 of this invention comprehensively covers the actual dimensions of most wellbores in the field, making the laboratory test results highly representative and practically valuable, and capable of directly guiding the research and development of logging instruments and algorithm calibration.

[0031] In such Figure 1 In the preferred embodiment shown, the host computer 1 may include: a probe control module 14, used to send position control commands to the adjustable displacement device 31 through a second communication interface to adjust the spatial position of the ultrasonic transducer 32; a data processing module 11, used to receive the collected data from the control circuit module 25 through a first communication interface, and process and analyze the collected data to calculate the wall thickness of the sleeve section 33, the resonance efficiency of the ultrasonic transducer, and generate a spectrum diagram of the echo signal; a data storage module 13, used to store system configuration parameters, collected echo data, and processing results of the data processing module 11; and a data display module 12, used to display in real time the echo waveform, spectrum analysis diagram, wall thickness measurement value, resonance efficiency parameter, and position information of the ultrasonic transducer output by the data processing module 11.

[0032] Furthermore, the host computer 1 can also be configured with ultrasonic scanning measurement and analysis software (not shown in the figure). The ultrasonic scanning measurement and analysis software can integrate the functions of probe control module 14, data processing module 11, data storage module 13 and data display module 12, and provide one-click measurement of mud sound velocity, as well as automatic positioning of the center and eccentricity scanning measurement function for the arc-shaped casing section 33.

[0033] The steps for implementing the automatic center positioning function may include: controlling the adjustable displacement device 31 to drive the ultrasonic transducer 32 to move in a grid pattern within a preset two-dimensional scanning area, and pausing at multiple points along the movement path; at each point, controlling the transmitting circuit module 23 and the acquisition circuit module 24 to work to acquire the corresponding echo signal, and recording the spatial coordinates of the current point and the amplitude value of the echo signal; comparing the amplitude values ​​of the echo signals acquired at all points to find the target point with the largest echo signal amplitude; calculating the center coordinates of the arc-shaped sleeve section 33 based on the coordinates of the target point, and controlling the adjustable displacement device 31 to move the ultrasonic transducer 32 to the center coordinate position to complete the center positioning.

[0034] The steps for implementing the eccentric scanning measurement function may include: after completing the automatic center positioning step, receiving input eccentric parameters, which may include at least eccentric distance and scanning range; using the center coordinates as a reference, calculating an eccentric scanning path based on the eccentric distance and scanning range; controlling the adjustable displacement device 31 to drive the ultrasonic transducer 32 to move along the eccentric scanning path, and continuously or intermittently triggering the transmitting circuit module 23 and the acquisition circuit module 24 to work during the movement to acquire a series of echo signal data at eccentric positions; processing and analyzing the acquired echo signal data at eccentric positions, and generating a response chart or data set to characterize the influence of eccentricity on the measurement results.

[0035] According to a preferred embodiment of the present invention, such as Figure 1 As shown, the mud circulation system 4 may include a peristaltic pump and a replaceable pump tube. The test water tank 3 may have an outlet / inlet connected to the replaceable pump tube. The peristaltic pump is configured to have a pumping mode and an inlet mode. After the liquid in the test water tank 3 is pumped out in the pumping mode, the liquid is replaced in the inlet mode to achieve the circulation and replacement of mud in the test water tank 3. When it is necessary to change the type of mud, the replaceable pump tube is replaced to avoid cross-contamination between different muds in the system. This embodiment solves the technical problem of convenient replacement of different mud media and thorough prevention of contamination in a simple way. The fluid isolation characteristics of the peristaltic pump and the replaceable pump tube design ensure the purity of experimental data and the convenience of experimental operation.

[0036] In another preferred embodiment, the mud circulation system 4 may include a peristaltic pump, a replaceable pump tube, and a connecting pipeline. The peristaltic pump is connected in series in the connecting pipeline via the replaceable pump tube. One end of the connecting pipeline is connected to the outlet of the test water tank, and the other end is connected to the inlet of the test water tank, forming a closed loop. The peristaltic pump can be configured to drive the mud in the replaceable pump tube to flow from the outlet to the inlet when it is running, so as to realize the circulation and replacement of the mud in the test water tank. When it is necessary to change the type of mud, the replaceable pump tube is replaced to avoid cross-contamination of different muds in the system.

[0037] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0038] In the description of this invention, it should be understood that the terms "lateral", "vertical", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A laboratory testing system for ultrasonic transducers, characterized in that, include: A test water tank is used to contain liquid media to simulate the downhole liquid environment. The inner wall of the test water tank is provided with positioning slots with multiple adjustment levels. An adjustable displacement device is installed inside the test water tank. The ultrasonic transducer is fixed on the adjustable displacement device. The adjustable displacement device is configured to drive the ultrasonic transducer to move and position laterally and longitudinally within the test water tank. The casing section is detachably installed in the positioning slot and is positioned opposite to the ultrasonic transducer. By selecting different specifications of the casing section and adjusting the installation of the casing section in different adjustment positions in the positioning slot, wellbore environments with different sizes and wall thicknesses of casing sections and different relative distances between the casing section and the ultrasonic transducer can be simulated. The chassis is electrically connected to the ultrasonic transducer. The chassis integrates: a transmitting circuit module for transmitting excitation electrical signals to the ultrasonic transducer; an acquisition circuit module for receiving echo electrical signals from the ultrasonic transducer and preprocessing and converting them from analog to digital; and a control circuit module that is connected to both the transmitting circuit module and the acquisition circuit module. The host computer is connected to the control circuit module via a first communication interface to send transmission parameters and acquisition commands to the control circuit module, and to receive acquisition data from the control circuit module. Simultaneously, the host computer is connected to the adjustable displacement device via a second communication interface to send position control commands to adjust the spatial position of the ultrasonic transducer, and to process, display, and store the received acquisition data. A mud circulation system is provided, which is connected to the inlet and outlet of the test water tank via pipelines. It is used to pump external mud into or out of the test water tank to replace the test liquid medium and avoid cross-contamination between different muds.

2. The ultrasonic transducer laboratory testing system according to claim 1, characterized in that, The control circuit module is configured as follows: Send a transmit enable signal and waveform parameter command to the transmitting circuit module to control it to generate a high-voltage excitation pulse with a specific frequency and duty cycle; Send a data acquisition trigger signal and sampling parameter instructions to the data acquisition circuit module to control it to start high-speed sampling at a specific delay after the transmitting circuit module emits ultrasonic waves and before the echo signal arrives; as well as The system receives the digital echo signal converted from the acquisition circuit module and performs preliminary buffering and format conversion on the signal.

3. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, The chassis also integrates: The power supply module is used to connect to an external AC power source and convert it into a low-voltage DC power source required by the system to power the transmitting circuit module, the acquisition circuit module and the control circuit module; and The voltage conversion module has its input terminal electrically connected to the low-voltage DC power output by the power supply module, and is used to convert the low-voltage DC power into a stable high-voltage DC signal and provide operating power for the transmitting circuit module.

4. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, The adjustable displacement device includes: a lateral motion unit, a longitudinal motion unit, and a transducer clamp installed in the test water tank. The lateral motion unit includes a lateral guide rail fixed in the test water tank, a lateral slider cooperating with the lateral guide rail, and a lateral drive motor for driving the lateral slider. The longitudinal motion unit includes a longitudinal guide rail fixedly installed on the lateral slider, a longitudinal slider cooperating with the longitudinal guide rail, and a longitudinal drive motor for driving the longitudinal slider. The transducer clamp is fixedly installed on the longitudinal slider. The lateral drive motor and the longitudinal drive motor are respectively electrically connected to the host computer and receive its position control commands, thereby driving the lateral slider and the longitudinal slider to move, so as to drive the ultrasonic transducer to perform precise displacement in the horizontal and vertical directions.

5. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, Each of the adjustment positions is arranged laterally along the test water tank. Each adjustment position includes a first vertical groove and a second vertical groove fixed on two opposite side walls of the test water tank. The two ends of the sleeve section are detachably connected in the first vertical groove and the second vertical groove. By selectively engaging the sleeve section in different adjustment positions, the relative distance between the sleeve section and the ultrasonic transducer can be changed.

6. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, The test water tank is made of thick stainless steel plate to shield against external signal interference.

7. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, The casing section includes various sizes of curved casing and flat steel plates, ranging from 5 inches to 22 inches in size and 0.5 cm to 3.2 cm in wall thickness.

8. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, The host computer includes: The probe control module is used to send position control commands to the adjustable displacement device through the second communication interface to adjust the spatial position of the ultrasonic transducer; The data processing module is used to receive the collected data from the control circuit module through the first communication interface, and to process and analyze the collected data to calculate the wall thickness of the sleeve section, the resonance efficiency of the ultrasonic transducer, and generate the spectrum of the echo signal. The data storage module is used to store system configuration parameters, acquired echo data, and the processing results of the data processing module; and The data display module is used to display in real time the echo waveform, spectrum analysis diagram, wall thickness measurement value, resonance efficiency parameter, and position information of the ultrasonic transducer output by the data processing module.

9. The ultrasonic transducer laboratory testing system according to claim 8, characterized in that, The host computer is also equipped with ultrasonic scanning measurement and analysis software. The ultrasonic scanning measurement and analysis software integrates the functions of the probe control module, data processing module, data storage module and data display module, and provides a one-click measurement function for mud sound velocity, as well as an automatic positioning center and eccentric scanning measurement function for arc-shaped casing sections.

10. The ultrasonic transducer laboratory testing system according to claim 1 or 2, characterized in that, The mud circulation system includes a peristaltic pump and a replaceable pump tube. The test water tank has an outlet / inlet connected to the replaceable pump tube. The peristaltic pump is configured to have a pumping mode and an inlet mode. After the liquid in the test water tank is pumped out in the pumping mode, the liquid is replaced by the inlet mode to realize the circulation and replacement of mud in the test water tank. When it is necessary to change the type of mud, the replaceable pump tube is replaced to avoid cross-contamination of different muds in the system.

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