A method and device for correcting azimuth signal background value of a while-drilling azimuthal electromagnetic wave instrument

Abstract

The application discloses a method and device for correcting background value of azimuth signal of a while-drilling azimuthal electromagnetic wave instrument. The method comprises the following steps: acquiring background correction information of each sector; acquiring actual measurement data obtained by measurement of the while-drilling azimuthal electromagnetic wave instrument; and acquiring corrected measurement data according to the actual measurement data and the background correction parameter. The method combines simulation data and actual measurement data, acquires background value of azimuth data of different sectors, eliminates the influence of background values of different sectors of the instrument, and greatly increases the edge detection distance of the instrument.

Description

Technical Field

[0001] This application relates to the field of drilling azimuth electromagnetic resistivity instrument technology, specifically to a method and device for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument. Background Technology

[0002] The azimuth-based electromagnetic resistivity logging tool (WALP) gains formation boundary detection capabilities by adding inclined or horizontal antennas. Combined with its multi-frequency and multi-transmit / receiver range characteristics, it can detect formation information at different depths.

[0003] Existing patent (CN202210621327.5) describes a method for correcting drilling azimuth electromagnetic wave signals using an air-seawater model. This method can effectively obtain azimuth signal correction coefficients, correcting the measured signal to an analog signal for subsequent inversion calculations. However, analysis of measurement data reveals that random noise varies across different sectors. Simply using the average value of each depth point as the instrument's background value cannot completely eliminate the influence of noise, especially at greater depths from the sea surface. The error caused by the different background noise in different sectors gradually increases, affecting the instrument's probe depth. Traditional methods use the average value of measurement data from 16 sectors as the instrument's background noise. When the azimuth signal is large, this can suppress the influence of background noise. However, because the local noise varies from sector to sector, this method cannot completely eliminate the influence of background noise when the azimuth signal is small. The interference of background noise significantly interferes with the instrument's detection signal, reducing the instrument's probe depth. Therefore, it is necessary to perform background value correction for the azimuth signals of different sectors.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument to overcome or at least mitigate one of the above-mentioned defects of the prior art.

[0006] One aspect of the present invention provides a method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument, used in a drilling azimuth electromagnetic wave resistivity instrument, the method comprising:

[0007] Obtain the baseline correction information for each sector;

[0008] Obtain actual measurement data by using a drilling azimuth electromagnetic wave instrument;

[0009] The corrected measurement data is obtained based on the actual measurement data and the background correction parameters.

[0010] Optionally, obtaining the background correction information for each sector includes:

[0011] Obtain the response values ​​of the analog signals in different sectors;

[0012] Acquire measurement signals from different sectors;

[0013] Obtain the average value of the measured signal;

[0014] Obtain the amplitude reduction factor and phase shift factor;

[0015] The background correction information for each sector is obtained based on the response values ​​of the analog signals of different sectors, the measurement signals of different sectors, the average value of the measurement signals, the amplitude reduction factor, and the phase shift factor.

[0016] Optionally, acquiring the response values ​​of the analog signals from different sectors includes:

[0017] The response values ​​of the analog signals in different sectors are obtained through simulation.

[0018] Optionally, obtaining the response values ​​of the analog signals of different sectors through simulation includes:

[0019] The response values ​​of analog signals from different sectors are obtained through simulation, including:

[0020] Step 101: Set the instrument to be placed horizontally, 8m away from the boundary, and with the azimuth antenna normal phase perpendicular to the interface;

[0021] Step 102: According to the direction of the azimuth antenna normal phase, rotate 45 degrees clockwise each time to perform simulation simulation, thereby obtaining the response value of the simulated signal of each sector at the 8m position, where each 45 degrees is a sector.

[0022] Step 103: Set the instrument to 1.5 meters from the boundary and repeat step 102 to obtain the response values ​​of the analog signal of each sector at the 1.5m position.

[0023] Optionally, acquiring measurement signals from different sectors includes:

[0024] The instrument was tested in an air-seawater environment to obtain measurement signals from different sectors and the average value of the measurement signals.

[0025] Optionally, the step of testing the instrument in an air-seawater environment to obtain measurement signals from different sectors and the average value of the measurement signals includes:

[0026] Step 201: Place the instrument horizontally 8m above the water surface, with the azimuth antenna normal phase perpendicular to the air-seawater interface;

[0027] Step 202: According to the direction of the azimuth antenna normal phase, rotate 45 degrees clockwise each time to fix the state, thereby obtaining the response value of the measurement signal of each sector at the 8m position, where each 45 degrees is a sector.

[0028] Step 203: Set the instrument to a distance of 1.5 meters from the water surface and repeat step 202 to obtain the response values ​​of the measurement signals of each sector at the 1.5m position;

[0029] Step 204: Obtain the average value of the measurement signal at the 8m position based on the response values ​​of the measurement signals of each sector at the 8m position.

[0030] Optionally, the background correction information is obtained using the following formula:

[0031] in,

[0032] S represents the response value of the analog signal in different sectors at the 8m position, M represents the measurement signal in different sectors at the 8m position, and M... average The average value of the measurement signal at the 8m location, where A is the amplitude reduction factor. This is the phase shift factor.

[0033] This application also provides a background value correction device for the azimuth signal of a drilling azimuth electromagnetic wave instrument, the background value correction device for the azimuth signal of the drilling azimuth electromagnetic wave instrument includes:

[0034] The background correction information acquisition module is used to acquire the background correction information of each sector.

[0035] The actual measurement data acquisition module is used to acquire actual measurement data obtained by measuring with a drilling azimuth electromagnetic wave instrument.

[0036] The corrected measurement data acquisition module is used to acquire corrected measurement data based on the actual measurement data and the background correction parameters.

[0037] This application also provides an electronic device, which includes: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the drilling azimuth electromagnetic wave instrument azimuth signal background value correction method as described above.

[0038] This application also provides a computer-readable storage medium storing a computer program executable by an electronic device. When the computer program is run on the electronic device, it can implement the steps of the drilling azimuth electromagnetic wave instrument azimuth signal background value correction method as described above.

[0039] Beneficial effects:

[0040] The method for correcting the background value of the azimuth signal of the drilling azimuth electromagnetic wave instrument in this application combines simulated data and measured data to obtain the background value of the azimuth data in different sectors. By eliminating the influence of the background value of different sectors of the instrument, the instrument's probing distance is greatly increased. Attached Figure Description

[0041] Figure 1 This is a flowchart illustrating a method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument according to an embodiment of this application.

[0042] Figure 2 It is an electronic device used to achieve Figure 1 The method for obtaining signal frequency is shown.

[0043] Figure 3 This is a schematic diagram of the structure of a drilling azimuth electromagnetic resistivity instrument antenna according to an embodiment of this application.

[0044] Figure 4 This is a schematic diagram of simulated data showing the variation curves of the real and imaginary parts of the azimuth signal with depth in a method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument according to an embodiment of this application.

[0045] Figure 5 This is a schematic diagram of azimuth simulation data at different altitudes according to an embodiment of this application.

[0046] Figure 6 A schematic diagram of azimuth measurement data at different altitudes obtained using existing technology.

[0047] Figure 7 This is a schematic diagram of measured data showing the variation curves of the real and imaginary parts of the azimuth signal with depth obtained by the prior art.

[0048] Figure 8 This is a schematic diagram of measured data of azimuth data at different altitudes obtained by the prior art after processing.

[0049] Figure 9 This is a schematic diagram of measured data showing the changes in the real and imaginary parts of the processed azimuth signal with depth, obtained using the prior art.

[0050] Figure 10 This is a schematic diagram of the background correction information of different sector azimuth signals according to an embodiment of this application.

[0051] Figure 11 This is a schematic diagram of azimuth data at different altitudes corrected by background correction information according to an embodiment of this application.

[0052] Figure 12 This is a schematic diagram of the azimuth signal intensity versus depth curve after background correction information correction, according to an embodiment of this application. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0054] It should be noted that in the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] Figure 1 This is a flowchart illustrating a method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument according to an embodiment of this application.

[0056] like Figure 1 The method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument, as shown, is used for drilling azimuth electromagnetic wave resistivity instruments. The signal frequency acquisition method includes:

[0057] Step 1: Obtain the background correction information for each sector;

[0058] Step 2: Obtain actual measurement data by using a drilling azimuth electromagnetic wave instrument;

[0059] Step 3: Obtain the corrected measurement data based on the actual measurement data and the background correction parameters.

[0060] The method for correcting the background value of the azimuth signal of the drilling azimuth electromagnetic wave instrument in this application combines simulated data and measured data to obtain the background value of the azimuth data in different sectors. By eliminating the influence of the background value of different sectors of the instrument, the instrument's probing distance is greatly increased.

[0061] In this embodiment, obtaining the background correction information for each sector includes:

[0062] Obtain the response values ​​of the analog signals in different sectors;

[0063] Acquire measurement signals from different sectors;

[0064] Obtain the average value of the measured signal;

[0065] Obtain the amplitude reduction factor and phase shift factor;

[0066] The background correction information for each sector is obtained based on the response values ​​of the analog signals of different sectors, the measurement signals of different sectors, the average value of the measurement signals, the amplitude reduction factor, and the phase shift factor.

[0067] In this embodiment, obtaining the response values ​​of the analog signals from different sectors includes:

[0068] The response values ​​of the analog signals in different sectors are obtained through simulation.

[0069] In this embodiment, obtaining the response values ​​of the analog signals of different sectors through simulation includes:

[0070] The response values ​​of analog signals from different sectors are obtained through simulation, including:

[0071] Step 101: Set the instrument to be placed horizontally, 8m away from the boundary, and with the azimuth antenna normal phase perpendicular to the interface;

[0072] Step 102: According to the direction of the azimuth antenna normal phase, rotate 45 degrees clockwise each time to perform simulation simulation, thereby obtaining the response value of the simulated signal of each sector at the 8m position, where each 45 degrees is a sector.

[0073] Step 103: Set the instrument to 1.5 meters from the boundary and repeat step 102 to obtain the response values ​​of the analog signal of each sector at the 1.5m position (including the imaginary part response value and the real part response value of the analog signal at the 1.5m position).

[0074] In this embodiment, if the response values ​​of analog signals from various sectors at other locations are also needed, the following steps can be added:

[0075] Step 104: Move the instrument downwards by 0.5m / 0.3m. When the instrument is more than 1.5m away from the interface, it will descend by 0.5m each time. When the instrument is less than or equal to 1.5m away from the interface, it will descend by 0.3m each time. Repeat step 102.

[0076] Step 105: Repeat step 104 until the instrument moves to a distance of 0.3m from the boundary, thereby obtaining the response values ​​of the analog signals in different sectors.

[0077] In this embodiment, acquiring measurement signals from different sectors includes:

[0078] The instrument was tested in an air-seawater environment to obtain measurement signals from different sectors and the average value of the measurement signals.

[0079] In this embodiment, the step of testing the instrument in an air-seawater environment to obtain measurement signals from different sectors and the average value of the measurement signals includes:

[0080] Step 201: Place the instrument horizontally 8m above the water surface, with the azimuth antenna normal phase perpendicular to the air-seawater interface;

[0081] Step 202: According to the direction of the azimuth antenna normal phase, rotate 45 degrees clockwise each time to fix the state, thereby obtaining the response value of the measurement signal of each sector at the 8m position, where each 45 degrees is a sector.

[0082] Step 203: Set the instrument to a distance of 1.5 meters from the water surface and repeat step 202 to obtain the response values ​​of the measurement signals of each sector at the 1.5m position (including the imaginary part response value and the real part response value of the measurement signal at the 1.5m position);

[0083] Step 204: Obtain the average value of the measurement signal at the 8m position based on the response values ​​of the measurement signals of each sector at the 8m position (in this embodiment, the average value is the response value of each sector divided by the number of sectors. For example, if there are 8 sectors, the response values ​​of the 8 sectors are added together and divided by 8).

[0084] In this embodiment, if the response values ​​of analog signals from various sectors at other locations are also needed, the following steps can be added:

[0085] Step 205: Move the instrument downwards by 0.5m / 0.3m. When the instrument is more than 1.5m away from the interface, it will descend by 0.5m each time. When the instrument is less than or equal to 1.5m away from the interface, it will descend by 0.3m each time. Repeat step 202.

[0086] Step 206: Repeat step 205 until the instrument moves to a distance of 0.3m from the boundary, thereby obtaining the response value of the measurement signal of each sector;

[0087] In this embodiment, the background correction information is obtained using the following formula:

[0088] in,

[0089] S represents the response value of the analog signal in different sectors, M represents the measurement signal in different sectors, and M average Let A be the average value of the measured signal, and let A be the amplitude reduction factor. This is the phase shift factor.

[0090] The following examples further illustrate this application in detail. It is understood that these examples do not constitute any limitation on this application.

[0091] See Figure 3 The antenna structure of the drilling azimuth electromagnetic resistivity instrument is as follows: Figure 3 As shown, T1-T4 are transmitting antennas, and R1-R4 are receiving antennas, with R3 and R4 being azimuth receiving antennas. R4 receives the transmitted signals from T1 and T2, and R3 receives the transmitted signals from T3 and T4. By analyzing the characteristics of the measurement data and combining it with simulation data, the background correction values ​​for different sectors are obtained.

[0092] See Figure 4 In this embodiment, a simulation is first performed based on the test model. The trend of the azimuth signal changing with depth is as follows: Figure 4 As shown (all curves in this article are the azimuth signals transmitted by T1 and received by R4 at 400kHz; the data processing method for other channels is the same).

[0093] At each depth point, data from different sectors were measured. Azimuth signals were selected from four locations: 8m, 5m, 3m, and 0.6m from the horizontal plane. Figure 5 As shown, the azimuth signal strength at these four locations increases as the boundary distance decreases.

[0094] Simulation data shows that the amplitude of the azimuth signal gradually decreases with increasing distance from the boundary. At each depth, the real and imaginary parts of the azimuth signal exhibit a sine and cosine function trend with changes in azimuth angle, and the reference value of the real and imaginary parts at each depth is 0. For measured data, two necessary processing steps exist: 1. Reference value correction; 2. Amplitude reduction and phase shift. For the second step, existing technologies have well-established processing procedures (see patent number CN202210621327.5). For the first step, the average value of multi-sector measurement data is commonly used as the reference value for correction, especially when the azimuth signal is relatively large (e.g., ...). Figure 5 When DTB = 0.6m, the reference value accounts for a small proportion of the measured signal; this method can effectively eliminate the influence of the reference value. When the azimuth signal is relatively small (e.g., ...), Figure 5 When DTB = 8m, since the reference value is different for each sector and the reference value accounts for a large proportion of the measurement signal, the above method cannot effectively eliminate the influence of the reference value. The result after processing by the above method will greatly reduce the instrument's edge detection distance.

[0095] The measured data were obtained according to the testing method described in (see patent number CN202210621327.5). The orientation signal at different depths varies with the sector number as follows: Figure 6 As shown, the azimuth signal changes with depth as follows: Figure 7 As shown.

[0096] Depend on Figure 6 It can be seen that when the distance to the water surface is relatively close, the azimuth signal is strong, the background value has little influence on the azimuth signal, the trend of the measured data is relatively obvious, and it is similar to the trend of the forward modeling curve. When the distance to the water surface is relatively far (such as 8m and 5m from the horizontal plane), the azimuth signal is weak, and the background value has a more serious influence on the azimuth signal. From Figure 7 It can also be seen that when the distance from the water surface is relatively far, the trend of the imaginary part of the azimuth signal changes, deviating from theoretical understanding and simulation results. Background value correction must be performed to reduce the influence of background values ​​from different sectors on the azimuth signal and improve the instrument's edge detection capability.

[0097] First, the data was processed according to the data processing method mentioned in patent number CN202210621327.5, and the processing result was as follows. Figure 8 as well as Figure 9 .

[0098] After correction Figure 8 and simulated curves Figure 5 The trends should be the same. However, a comparison shows that in this embodiment, when the distance from the water surface is 8m, the measured azimuth signal's variation trend with the sector does not match the theoretical trend, indicating that the azimuth signal is unreliable when the instrument is far from the sea surface. The above analysis shows that this is due to the influence of background noise in the original signal, and the influence of the background value cannot be eliminated by traditional methods. Therefore, it is necessary to perform background value correction for different sectors.

[0099] This application employs the following method for correction:

[0100] Obtain the baseline correction information for each sector;

[0101] Obtain actual measurement data by using a drilling azimuth electromagnetic wave instrument;

[0102] The corrected measurement data is obtained based on the actual measurement data and the background correction parameters.

[0103] Taking an instrument 8m above the water surface as an example, the response value of different sectors of the analog signal is S, and the measurement signal of different sectors is M. The average value of the measurement signal across different sectors is M0. average The amplitude reduction factor is A, and the phase shift factor is

[0104] The formulas for calculating the background correction values ​​for different sectors are shown below:

[0105] in,

[0106] K represents the background correction value for different sectors. K, S, and M are all vectors of length 8, and each vector value is a complex number. The K value is obtained through the above calculation, and this value contains the background correction values ​​for 8 sectors, each sector containing both real and imaginary correction values. The amplitude reduction factor A and the phase shift factor are... The expression is as follows:

[0107]

[0108]

[0109] in,

[0110] In this embodiment, Re s Represents the real response value of the virtual signal in each sector at a position of 1.5m, Im s Re represents the real response value of the virtual signal in each sector at a position of 1.5m. m This represents the real response value of the measurement signal for each sector at a position of 1.5m, Im. m This represents the imaginary response value of the measurement signal for each sector at a position of 1.5m.

[0111] The background correction value is obtained through calculation, as follows: Figure 9 As shown.

[0112] After calculating the background correction values ​​for different sectors, these values ​​are written into the instrument as background correction parameters. When data is measured, the corresponding background correction values ​​are first subtracted from the measurement data for different sectors to obtain the background correction information for each sector.

[0113] After the background value correction is completed, the following processes are performed in sequence: reference value correction, curve fitting, amplitude ratio reduction, and phase difference shift, in order to be used for subsequent inversion calculations (the processes of reference value correction, curve fitting, amplitude ratio reduction, and phase difference shift, in order to be used for subsequent inversion calculations, are existing technologies and will not be described in detail here).

[0114] After calculating and obtaining the background correction values ​​for different sectors, the test data is corrected using azimuth signals from different sectors. The trend of the azimuth signal can then be obtained through processing. Figure 10 As shown.

[0115] contrast Figure 11 and Figure 8It can be seen that by combining test data and simulation data, the azimuth signal correction values ​​of different sectors were obtained. The background correction values ​​of different sectors were applied to the data at each depth. The correction values ​​did not change the trend of the azimuth signal at a location far from the water surface, but greatly improved the azimuth signal at a location far from the water surface (DTB=8m). The corrected azimuth signal trend is consistent with the simulation data trend. The comparison results of the azimuth signal before and after correction with the simulation signal are shown below.

[0116] Figure 12 The left image shows the result before sector correction, and the right image shows the result after sector correction. It can be seen that before correction using different sector background values, a deviation occurs between the measured signal and the analog signal starting at a distance of 6m from the water surface, indicating that the instrument's boundary detection capability is limited to 6m. After correction using different sector background values, the consistency between the analog and measured signals remains relatively good at a distance of 8m from the water surface. The azimuth signal detection distance increases from 6m to 8m, significantly increasing the azimuth data detection distance.

[0117] This application proposes a method for correcting the background value of different sectors based on simulation data analysis. This method can effectively eliminate local noise in the measurement data of different sectors of the azimuth antenna of the drilling azimuth electromagnetic resistivity instrument and improve the edge probing depth of the drilling azimuth electromagnetic resistivity instrument.

[0118] This application also provides a background value correction device for the azimuth signal of a drilling azimuth electromagnetic wave instrument. The background value correction device includes a background correction information acquisition module, an actual measurement data acquisition module, and a corrected measurement data acquisition module; wherein...

[0119] The background correction information acquisition module is used to acquire the background correction information for each sector.

[0120] The actual measurement data acquisition module is used to acquire actual measurement data obtained by measuring with the drilling azimuth electromagnetic wave instrument.

[0121] The corrected measurement data acquisition module is used to acquire corrected measurement data based on the actual measurement data and the background correction parameters.

[0122] This application also provides an electronic device, which includes: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the drilling azimuth electromagnetic wave instrument azimuth signal background value correction method as described above.

[0123] This application also provides a computer-readable storage medium storing a computer program executable by an electronic device. When the computer program is run on the electronic device, it can implement the steps of the drilling azimuth electromagnetic wave instrument azimuth signal background value correction method as described above.

[0124] It is understandable that the above description of the method also applies to the description of the apparatus.

[0125] Figure 2 This is an exemplary structural diagram of an electronic device capable of implementing the method for correcting the background value of the azimuth signal of a drilling azimuth electromagnetic wave instrument according to an embodiment of this application.

[0126] like Figure 2 As shown, the electronic device includes an input device 501, an input interface 502, a central processing unit 503, a memory 504, an output interface 505, and an output device 506. The input interface 502, central processing unit 503, memory 504, and output interface 505 are interconnected via a bus 507. The input device 501 and output device 506 are connected to the bus 507 via the input interface 502 and output interface 505, respectively, and thus connected to other components of the electronic device. Specifically, the input device 501 receives input information from the outside and transmits it to the central processing unit 503 via the input interface 502. The central processing unit 503 processes the input information based on computer-executable instructions stored in the memory 504 to generate output information, temporarily or permanently storing the output information in the memory 504, and then transmitting the output information to the output device 506 via the output interface 505. The output device 506 outputs the output information to the outside of the electronic device for user use.

[0127] In other words, Figure 2 The illustrated electronic device may also be implemented as including: a memory storing computer-executable instructions; and one or more processors, which can be coupled when executing the computer-executable instructions. Figure 1 The method described is for correcting the background value of the azimuth signal of the drilling azimuth electromagnetic wave instrument.

[0128] In one embodiment, Figure 2 The electronic device shown can be implemented as including: a memory 504 configured to store executable program code; and one or more processors 503 configured to run the executable program code stored in the memory 504 to execute the drilling azimuth electromagnetic wave instrument azimuth signal background value correction method in the above embodiments.

[0129] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0130] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0131] Computer-readable media include both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, DVD or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0132] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0133] Furthermore, it is clear that the word "comprising" does not exclude other units or steps. Multiple units, modules, or devices recited in a device claim may also be implemented by a single unit or overall device through software or hardware. The terms "first," "second," etc., are used to identify names, not to indicate any specific order.

[0134] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutively marked blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or the overall flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0135] In this embodiment, the processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0136] Memory can be used to store computer programs and / or modules. The processor implements various functions of the device / terminal equipment by running or executing the computer programs and / or modules stored in the memory, and by accessing data stored in the memory. Memory can mainly include a program storage area and a data storage area. The program storage area can store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area can store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). In addition, memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0137] In this embodiment, if the modules / units integrated into the device / terminal equipment are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0138] It should be noted that the content contained in a computer-readable medium may be appropriately added to or reduced according to the requirements of legislation and patent practice in the jurisdiction. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0139] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for correcting azimuth signal background value of a LWD azimuthal electromagnetic wave instrument, used in a LWD azimuthal electromagnetic wave resistivity instrument, characterized in that, The method for correcting the background value of the azimuth signal of the drilling azimuth electromagnetic wave instrument includes: Obtain the baseline correction information for each sector; Obtain actual measurement data by using a drilling azimuth electromagnetic wave instrument; The corrected measurement data is obtained based on the actual measurement data and the background correction parameters; The acquisition of the background correction information for each sector includes: Obtain the response values ​​of the analog signals in different sectors; Acquire measurement signals from different sectors; Obtain the average value of the measured signal; Obtain the amplitude reduction factor and phase shift factor; The background correction information for each sector is obtained based on the response values ​​of the analog signals of different sectors, the measurement signals of different sectors, the average value of the measurement signals, the amplitude reduction factor, and the phase shift factor. The acquisition of response values ​​of analog signals from different sectors includes: The response values ​​of analog signals in different sectors are obtained through simulation. The method of obtaining the response values ​​of analog signals from different sectors through simulation includes: Step 101: Set the instrument to be placed horizontally, 8 m away from the boundary, and with the azimuth antenna normal phase perpendicular to the interface; Step 102: According to the direction of the azimuth antenna normal phase, rotate 45 degrees clockwise each time to perform simulation simulation, thereby obtaining the response value of the simulated signal of each sector at the 8 m position, where each 45 degrees is a sector. Step 103: Set the instrument to 1.5 meters from the boundary and repeat step 102 to obtain the response values ​​of the analog signal of each sector at the 1.5 m position; The acquisition of measurement signals from different sectors includes: The instrument was tested in an air-seawater environment to obtain measurement signals from different sectors and the average value of the measurement signals; The process of testing the instrument in an air-seawater environment to obtain measurement signals from different sectors and the average value of the measurement signals includes: Step 201: Place the instrument horizontally 8 m above the water surface, with the azimuth antenna normal phase perpendicular to the air-seawater interface; Step 202: According to the direction of the azimuth antenna normal phase, rotate 45 degrees clockwise each time to fix the state, thereby obtaining the response value of the measurement signal of each sector at the 8 m position, where each 45 degrees is a sector. Step 203: Set the instrument to a distance of 1.5 meters from the water surface and repeat step 202 to obtain the response values ​​of the measurement signals of each sector at the 1.5 m position; Step 204: Obtain the average value of the measurement signal at the 8m position based on the response values ​​of the measurement signals of each sector at the 8m position; The background correction information is obtained using the following formula: ;in, S represents the response value of the analog signal in different sectors at a position of 8 m, M represents the measurement signal in different sectors at a position of 8 m, and M average The average value of the measured signal at a position of 8 m, where A is the amplitude reduction factor. This is the phase shift factor.

2. A background value correction device for azimuth signals of a drilling azimuth electromagnetic wave instrument, used in the background value correction method for azimuth signals of a drilling azimuth electromagnetic wave instrument as described in claim 1, characterized in that, The azimuth signal background value correction device for the drilling azimuth electromagnetic wave instrument includes: The background correction information acquisition module is used to acquire the background correction information of each sector. The actual measurement data acquisition module is used to acquire actual measurement data obtained by measuring with a drilling azimuth electromagnetic wave instrument. The corrected measurement data acquisition module is used to acquire corrected measurement data based on the actual measurement data and the background correction parameters.

3. An electronic device, characterized in that, The electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the method for correcting the background value of the azimuth signal of the drilling azimuth electromagnetic wave instrument as described in claim 1.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program executable by an electronic device, which, when run on the electronic device, enables the implementation of the steps of the drilling azimuth electromagnetic wave instrument azimuth signal background value correction method as described in claim 1.

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