Pulse width determination method and device, electronic equipment and storage medium

Abstract

The invention provides a pulse width method and device, electronic equipment and a storage medium, and the method comprises the steps: transmitting N transmitting rectangular waves with sequentially increased pulse widths within N transmitting times; n receiving waveforms corresponding to the N transmitting rectangular waves are received in N transmitting intermittent times, and the transmitting coil and the receiving coil are located in a single-layer tubular column model well; determining difference information between the characteristics of two adjacent received waveforms; and determining the minimum pulse width for depth detection of the single-layer tubular column model well from N pulse widths based on the difference information, thereby realizing determination of the pulse width.

Description

Technical Field

[0001] The present application relates to the field of well logging technology, and in particular to a method, device, electronic device and storage medium for determining a pulse width. Background Art

[0002] Transient electromagnetic exploration is often used in ground geophysical exploration, coal mines, aviation and other fields. When applying transient electromagnetic well logging, it is necessary to formulate a reasonable detection depth. The distribution characteristics of magnetic lines of force can be changed by increasing the transmission power and increasing the length of the transmission coil, thereby increasing the detection depth. In the instrument implementation link, when the parameters such as transmission power and coil size are fixed, the change in the distribution density of magnetic lines of force can only be achieved by changing the pulse width of the rectangular wave, thereby realizing the detection of media at different depths around the well. However, when detecting the depth of a single-layer tubing well, how to determine the pulse width is an urgent problem to be solved. Summary of the invention

[0003] In order to solve the above problems, the present application provides a method, device, electronic device and storage medium for determining a pulse width.

[0004] The present application provides a method for determining a pulse width, the method comprising:

[0005] During N transmission times, N transmission rectangular waves with successively increasing pulse widths are transmitted;

[0006] During N transmission intervals, N receiving waveforms corresponding to the N transmitting rectangular waves are respectively received, wherein the transmitting coil and the receiving coil are located in a single-layer pipe string model well;

[0007] Determine difference information between characteristics of two adjacent received waveforms;

[0008] Based on the difference information, a minimum pulse width for depth detection of the single-layer tubing string model well is determined from N pulse widths, wherein N is a positive integer.

[0009] In some embodiments, determining the minimum pulse width for depth detection of the single-layer tubing string model well from the N pulse widths based on the difference information includes:

[0010] When the difference information represents the change information between the difference information corresponding to the i-th received echo and is less than the change threshold, the pulse width corresponding to the i-th received waveform is determined as the minimum pulse width for depth detection of the single-layer tubing model well, i is a positive integer, and i is less than or equal to N.

[0011] In some embodiments, the characteristics include: maximum amplitude and / or decay time.

[0012] In some embodiments, the method further comprises:

[0013] In case of obtaining a logging instruction for casing quality detection on the single-layer tubular string model well, determining a pulse width greater than or equal to the minimum pulse width as a first target pulse width for casing quality detection;

[0014] The casing quality is detected based on the first target pulse width.

[0015] In some embodiments, the method further comprises:

[0016] When a logging instruction for detecting the resistivity of the outer formation of the casing of the single-layer tubular string model well is obtained, a pulse width greater than the first target pulse width is determined as a second target pulse width;

[0017] Resistivity detection of the formation outside the casing is performed based on the second target pulse width.

[0018] In some embodiments, the emission time and the emission interval time are the same.

[0019] In some embodiments, the transmitted rectangular wave is a bipolar rectangular wave.

[0020] The embodiment of the present application provides a pulse width device, including:

[0021] A transmitting module, used for transmitting N transmitting rectangular waves with successively increasing pulse widths within N transmitting times;

[0022] A receiving module, used for receiving N receiving waveforms corresponding to N transmitting rectangular waves respectively during N transmitting intervals, wherein the transmitting coil and the receiving coil are located in a single-layer pipe string model well;

[0023] A first determining module, used to determine difference information between features of two adjacent received waveforms;

[0024] The second determination module is used to determine the minimum pulse width for depth detection of the single-layer tubing model well from N pulse widths based on the difference information, wherein N is a positive integer.

[0025] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the above-mentioned method for determining the pulse width is executed.

[0026] An embodiment of the present application provides a storage medium, which stores a computer program that can be executed by one or more processors and can be used to implement the above-mentioned method for determining the pulse width.

[0027] The present application provides a method, device, electronic device and storage medium for determining pulse width, which transmit N transmitting rectangular waves with successively increasing pulse widths within N transmitting times; receive N receiving waveforms corresponding to the N transmitting rectangular waves respectively within N transmitting intervals, wherein the transmitting coil and the receiving coil are located in a single-layer tubular model well; determine the difference information between the features of two adjacent receiving waveforms; and determine the minimum pulse width for depth detection of the single-layer tubular model well from the N pulse widths based on the difference information, thereby achieving the determination of the pulse width. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Hereinafter, the present application will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0029] Figure 1 A schematic diagram of an implementation flow of a method for determining a pulse width provided in an embodiment of the present application;

[0030] Figure 2 A waveform diagram of a rectangular wave emitted according to an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the position of the coil provided in the embodiment of the present application in a single-layer pipe string model well;

[0032] Figure 4 A schematic diagram of the detection depth after the pulse width of a rectangular wave emitted is increased provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the structure of a pulse width determination device provided in an embodiment of the present application;

[0034] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0035] In the drawings, the same reference numerals are used for the same components, and the drawings are not drawn to scale. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0037] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0038] If similar descriptions of "first\second\third" appear in the application documents, the following instructions will be added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0040] Based on the problems existing in the related art, the embodiment of the present application provides a method for determining pulse width, which is applied to electronic devices, such as computers, mobile terminals, transient electromagnetic logging instruments, etc. The function implemented by the method for determining pulse width provided in the embodiment of the present application can be implemented by calling program code by a processor of the electronic device, wherein the program code can be stored in a computer storage medium.

[0041] The present application embodiment provides a method for determining a pulse width. Figure 1 A schematic diagram of the implementation flow of a method for determining a pulse width provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, including:

[0042] Step S101, within N transmission times, N transmission rectangular waves with successively increasing pulse widths are respectively transmitted.

[0043] In the embodiment of the present application, the transmitting rectangular wave is a discontinuous bipolar rectangular wave signal, which is formed by loading the full-bridge transmitting circuit to both ends of the transmitting coil. During the signal transmission process, a steady-state primary magnetic field is established in the single-layer pipe string model well. The density of closed magnetic lines of force is affected by the magnetic resistance of the medium, and the density is different in various media. In areas with high distribution density, there are more magnetic lines of force and they are densely distributed. The distance from the center line of the solenoid to the outside of the area where the magnetic lines of force are relatively dense can be regarded as the equivalent logging detection depth. The pulse width of the transmitting waveform affects the detection depth. Therefore, the pulse width of the transmitting rectangular wave can be adjusted to generate rectangular waves in sequence to achieve the logging detection depth test.

[0044] In an embodiment of the present application, N transmitting rectangular waves with successively increasing pulse widths can be transmitted by a transmitting coil within N transmitting times, and the transmitting coil is arranged in a single-layer tubular model well.

[0045] The emitted rectangular wave is discontinuous. Figure 2A waveform diagram of a rectangular wave emitted by an embodiment of the present application is provided, such as Figure 2 As shown, the transmission rectangular wave is divided into a transmission time period TIME-T and a transmission interval time period TIME-R. A complete transmission cycle T is divided into four time periods: forward transmission, forward interval, reverse transmission, and reverse interval, and the width of each time period is T / 4. The implementation effects of forward transmission and reverse transmission are equivalent.

[0046] In the embodiment of the present application, the surrounding media of the single-layer tubing model well are generally divided into well fluid, casing, cement ring, formation and other media, and there is only one layer of casing. The casing is a strong magnetic and electrical conductive material relative to other layers of media. The single-layer tubing model well also specifically refers to a single-layer casing production well.

[0047] Exemplarily, the N pulse widths are T1, T2, T3, T4, T5, T6, T7, T8, T9, etc., and the transmission interval time is fixed.

[0048] Step S102, during N transmission intervals, respectively receiving N receiving waveforms corresponding to the N transmitting rectangular waves, wherein the transmitting coil and the receiving coil are located in a single-layer pipe string model well.

[0049] In the embodiment of the present application, Figure 3 A schematic diagram of the positions of the coil transmitting coil and the receiving coil provided in the embodiment of the present application in a single-layer pipe string model well, as shown in FIG. Figure 3 As shown, the transmitting coil 2 and the receiving coil 3 are wound on the frame 4, and the transmitting coil 2 and the receiving coil 3 are located in the single-layer pipe string model well 1. The two ends of the coil are placed along the well axis direction. The receiving coil frame is filled with magnetic material. The transmitting coil can be hollow or filled with magnetic material (sharing the same wire with the receiving coil). 1 / 2-inch steel casing simulates a single-layer tubing production well, and the probe is placed in the steel casing to form a single-layer tubing model well consisting of air and casing.

[0050] In the embodiment of the present application, when the rectangular wave transmission stops, the primary magnetic field disappears. During the transmission process, the magnetic field stored in the medium is converted into eddy currents for consumption. The eddy currents diffuse in the shape of smoke rings. After a period of time, the eddy currents are consumed to zero. The changing eddy currents generate secondary fields, which are received by the receiving coil. During the measurement period, the induced electromotive force output by the receiving coil decays over time in a quasi-exponential manner. The longer the decay time, the greater the detection depth of the instrument. Therefore, the detection depth can be reflected by receiving the waveform.

[0051] In the embodiment of the present application, the bipolar rectangular wave transmission signal period is T (transmission frequency f=1 / T), the transmission time and the transmission interval time are the same, and continue to refer to Figure 2, the duration of the transmission time period and the transmission interval time period are both T / 4. Low-frequency transmission helps to improve the detection depth of the instrument. In order to improve the logging time efficiency, the transmission frequency cannot be set too low. Taking into account the logging time efficiency and detection depth, the instrument needs to configure the transmission frequency reasonably. The duty ratio of the transmission time period (marked TIME-T in the figure) and the transmission interval time period (marked TIME-R in the figure) is 1:1, and TIME-T is also the transmission pulse width.

[0052] Step S103: determining difference information between the features of two adjacent received waveforms.

[0053] In the embodiment of the present application, the feature may be a maximum amplitude and / or a decay time.

[0054] Step S104, determining a minimum pulse width for depth detection of the single-layer tubing string model well from N pulse widths based on the difference information, wherein N is a positive integer.

[0055] In an embodiment of the present application, when the difference information represents the change information between the difference information corresponding to the i-th received echo and is less than a change threshold, the pulse width corresponding to the i-th received waveform is determined as the minimum pulse width for depth detection of the single-layer tubing model well, i is a positive integer, and i is less than or equal to N.

[0056] Continuing with the above example, the time period during which the instrument records useful information of the received waveform is TIME-R, and the received waveform during TIME-R reflects the transmission effect of the transmitted waveform during the TIME-T time period.

[0057] Affected by the transmitting circuit, the leading and trailing edges of the forward transmitting waveform are distorted, and are stable at a constant value for most of the time period. During the signal transmission process (TIME-T), the amplitude of the waveform after stabilization is the same at different transmitting pulse widths, indicating that the transmitting current is the same at different transmitting pulse widths, which also proves that the transmitting coil is working under constant power transmission conditions. During the forward transmission process, the leading edge of the transmitting waveform extends to the left after the transmitting pulse width increases. Figure 4 A schematic diagram of detecting depth after increasing the pulse width of a rectangular wave emitted according to an embodiment of the present application is provided, such as Figure 4 As shown, after the pulse width of the transmitted rectangular wave increases, the distribution distance of the equivalent magnetic field intensity H (all magnetic lines generated by the transmitting coil are equivalent to one) around the well gradually increases, thereby increasing the logging detection depth.

[0058] During the receiving time period TIME-R, by analyzing the received waveform, it can be obtained that the attenuation process of the received waveform gradually becomes longer, indicating an increase in the logging detection depth. During the process where the received waveform at TIME-R decays to zero, the process gradually becomes longer and the maximum amplitude of the waveform peak gradually increases. From the characteristics of the change in the received waveform, it verifies the physical phenomenon that the logging detection gradually increases after the increase in the transmitted pulse width time.

[0059] Exemplarily, when the transmitted pulse width > T4, the differences in the maximum amplitudes of different received waveforms are not significant, indicating that the magnetic field line density in the casing basically no longer increases, and the detection depth has reached the outer wall of the casing. From this, it can also be seen that when there is a need for electromagnetic flaw detection (detecting the quality of the casing), the transmitted pulse width should be set to at least the time width of T4. When performing cased-hole logging, the transmitted pulse width should be much greater than the width of T4.

[0060] When the transmitted pulse width < T4, the distribution of magnetic field lines around the transmitting coil is still in an unstable state, that is, the magnetic field line density in the air and the casing is in a non-saturated state, and there is still room for increase in the magnetic field lines when the transmitted pulse width is increased and changed. In the unstable state, when there are slight changes in the medium in the model well (such as uneven casing thickness), the amplitude of the received waveform will change, making the subsequent interpretation and processing process very difficult.

[0061] The embodiment of the present application provides a method for determining the pulse width. By transmitting N transmitted rectangular waves with gradually increasing pulse widths within N transmission times; within N transmission intervals, respectively receiving N received waveforms corresponding to the N transmitted rectangular waves, where the transmitting coil and the receiving coil are located in a single-layer string model well; determining the difference information between the characteristics of two adjacent received waveforms; and determining the minimum pulse width for depth detection of the single-layer string model well from the N pulse widths based on the difference information, the determination of the pulse width is realized.

[0062] In some embodiments, after step S104, the method further includes:

[0063] Step S105, when a logging instruction for casing quality detection of the single-layer string model well is obtained, determining a pulse width greater than or equal to the minimum pulse width as the first target pulse width for casing quality detection;

[0064] Step S106, performing casing quality detection based on the first target pulse width.

[0065] Continuing with the above example, electromagnetic flaw detection logging is mainly used for casing quality detection. When the transient electromagnetic logging technology is used for electromagnetic flaw detection logging, the pulse width of the transmission time is at least T4. When the transient electromagnetic logging technology is used for cased-hole resistivity logging, the pulse width of the transmission time should be much greater than T4.

[0066] In some embodiments, after step S106, the method further includes:

[0067] When a logging instruction for detecting the resistivity of the outer formation of the casing of the single-layer tubular string model well is obtained, a pulse width greater than the first target pulse width is determined as a second target pulse width;

[0068] Resistivity detection of the formation outside the casing is performed based on the second target pulse width.

[0069] In the embodiment of the present application, when the single-layer tubing string model well performs logging to obtain the resistivity of the formation outside the casing, the emission pulse width used should be greater than the pulse width parameter value used for casing quality detection.

[0070] In the actual instrument, the emission time and emission interval time are the same. According to different detection depth requirements, different casing sizes are used to build single-layer pipe column well calibration models with different diameters. The instrument is placed in it for calibration to determine the optimal emission pulse width, frequency f = 1 / (4×emission pulse width). The actual logging instrument can appropriately reduce the frequency. The smaller the frequency, the lower the logging speed and the longer the logging time. The minimum frequency established should meet the logging timeliness requirements, and finally achieve the optimal configuration of the emission frequency of electromagnetic flaw detection and through-casing resistivity instruments.

[0071] Based on the foregoing embodiments, an embodiment of the present application provides a device for determining a pulse width. The modules included in the device and the units included in each module can be implemented by a processor in a computer device; of course, they can also be implemented by a specific logic circuit; in the implementation process, the processor can be a central processing unit (CPU, Central Processing Unit), a microprocessor (MPU, Microprocessor Unit), a digital signal processor (DSP, Digital Signal Processing) or a field programmable gate array (FPGA, Field Programmable Gate Array), etc.

[0072] The present application embodiment provides a device for determining a pulse width. Figure 5 A schematic diagram of a pulse width determination device provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the pulse width determination device 500 includes:

[0073] The transmitting module 501 is used to transmit N transmitting rectangular waves with successively increasing pulse widths within N transmitting times;

[0074] The receiving module 502 is used to receive N receiving waveforms corresponding to N transmitting rectangular waves respectively during N transmitting intervals, wherein the transmitting coil and the receiving coil are located in a single-layer pipe string model well;

[0075] A first determining module 503, configured to determine difference information between features of two adjacent received waveforms;

[0076] The second determination module 504 is used to determine the minimum pulse width for depth detection of the single-layer tubing model well from N pulse widths based on the difference information, where N is a positive integer.

[0077] In some embodiments, determining the minimum pulse width for depth detection of the single-layer tubing string model well from the N pulse widths based on the difference information includes:

[0078] When the difference information represents the change information between the difference information corresponding to the i-th received echo and is less than the change threshold, the pulse width corresponding to the i-th received waveform is determined as the minimum pulse width for depth detection of the single-layer tubing model well, i is a positive integer, and i is less than or equal to N.

[0079] In some embodiments, the characteristics include: maximum amplitude and / or decay time.

[0080] In some embodiments, the pulse width determination device is further configured to:

[0081] In case of obtaining a logging instruction for casing quality detection on the single-layer tubular string model well, determining a pulse width greater than or equal to the minimum pulse width as a first target pulse width for casing quality detection;

[0082] The casing quality is detected based on the first target pulse width.

[0083] In some embodiments, the pulse width determination device is further configured to:

[0084] When a logging instruction for detecting the resistivity of the outer formation of the casing of the single-layer tubular string model well is obtained, a pulse width greater than the first target pulse width is determined as a second target pulse width;

[0085] Resistivity detection of the formation outside the casing is performed based on the second target pulse width.

[0086] In some embodiments, the emission time and the emission interval time are the same.

[0087] In some embodiments, the transmitted rectangular wave is a bipolar rectangular wave.

[0088] It should be noted that in the embodiments of the present application, if the above-mentioned pulse width method is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiment of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM, ReadOnly Memory), a disk or an optical disk. In this way, the embodiments of the present application are not limited to any specific combination of hardware and software.

[0089] Accordingly, an embodiment of the present application provides a storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps in the method for determining the pulse width provided in the above embodiment are implemented.

[0090] An embodiment of the present application provides an electronic device; Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the electronic device 600 includes: a processor 601, at least one communication bus 602, a user interface 603, at least one external communication interface 604, and a memory 605. The communication bus 602 is configured to realize the connection and communication between these components. The user interface 603 may include a display screen, and the external communication interface 604 may include a standard wired interface and a wireless interface. The processor 601 is configured to execute the program of the pulse width determination method stored in the memory to implement the steps in the pulse width determination method provided in the above embodiment.

[0091] The description of the above display device and storage medium embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the computer device and storage medium embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0092] It should be noted here that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium and device embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0093] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0094] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0095] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0096] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0097] In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0098] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM, Read Only Memory), disks or optical disks, etc. Various media that can store program codes.

[0099] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application can essentially or in other words, the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for a controller to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0100] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining pulse width, characterized in that: include: During N transmission times, N transmission rectangular waves with successively increasing pulse widths are respectively transmitted; During N transmission intervals, N receiving waveforms corresponding to the N transmitting rectangular waves are respectively received, wherein the transmitting coil and the receiving coil are located in a single-layer pipe string model well; Determine difference information between characteristics of two adjacent received waveforms; Based on the difference information, a minimum pulse width for depth detection of the single-layer tubing string model well is determined from N pulse widths, wherein N is a positive integer.

2. The method according to claim 1, characterized in that The step of determining the minimum pulse width for depth detection of the single-layer tubing string model well from the N pulse widths based on the difference information includes: When the difference information represents the change information between the difference information corresponding to the i-th received echo and is less than the change threshold, the pulse width corresponding to the i-th received waveform is determined as the minimum pulse width for depth detection of the single-layer tubing model well, i is a positive integer, and i is less than or equal to N.

3. The method according to claim 2, characterized in that The characteristics include: maximum amplitude and / or decay time.

4. The method according to claim 2, characterized in that: The method further comprises: In case of obtaining a logging instruction for casing quality detection on the single-layer tubular string model well, determining a pulse width greater than or equal to the minimum pulse width as a first target pulse width for casing quality detection; The casing quality is detected based on the first target pulse width.

5. The method according to claim 4, characterized in that The method further comprises: When a logging instruction for detecting the resistivity of the outer formation of the casing of the single-layer tubular string model well is obtained, a pulse width greater than the first target pulse width is determined as a second target pulse width; Resistivity detection of the formation outside the casing is performed based on the second target pulse width.

6. The method according to claim 1, characterized in that The emission time and the emission interval time are the same.

7. The method according to claim 1, characterized in that The transmitting rectangular wave is a bipolar rectangular wave.

8. A pulse width determination device, characterized in that: include: A transmitting module, used for transmitting N transmitting rectangular waves with successively increasing pulse widths within N transmitting times; A receiving module, used for receiving N receiving waveforms corresponding to N transmitting rectangular waves respectively during N transmitting intervals, wherein the transmitting coil and the receiving coil are located in a single-layer pipe string model well; A first determining module, used to determine difference information between features of two adjacent received waveforms; The second determination module is used to determine the minimum pulse width for depth detection of the single-layer tubing model well from N pulse widths based on the difference information, wherein N is a positive integer.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for determining the pulse width according to any one of claims 1 to 7 is executed.

10. A storage medium, characterized in that: The computer program stored in the storage medium can be executed by one or more processors and can be used to implement the method for determining the pulse width as claimed in any one of claims 1 to 7.

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