Multi-mode drilling tool passing array lateral collecting and processing circuit, logging method and logging instrument

Abstract

The invention discloses a multi-mode drilling tool passing array lateral collecting and processing circuit, a logging method and a logging instrument, and belongs to the field of geophysical logging. A pre-amplification circuit is adopted to ensure that signals are not distorted in the amplification process, and meanwhile, a wider frequency range can be covered, so that the response capability to different depths of a stratum is improved. The frequency mixing weak signal detection module improves the detection capability of weak signals, so that the resolution capability of different depths of a stratum is enhanced. The main control acquisition module can more accurately control the working state of the frequency mixing weak signal detection module, and fine acquisition and preprocessing of underground electric signals are achieved. The signal source generation module ensures the stability and accuracy of the output sine wave analog signal. Acquisition modes are designed according to different exploration requirements, the optimal acquisition effect is achieved by adjusting working parameters of the pre-amplification circuit, the frequency mixing weak signal detection module and the signal source generation module in different modes, and the problems existing in the prior art can be solved.

Description

Technical Field

[0001] This invention belongs to the field of geophysical logging technology and relates to a multi-mode over-drill array lateral acquisition and processing circuit, logging method and logging instrument. Background Technology

[0002] As oil and gas field development deepens, exploration and development targets are becoming increasingly complex, and wellbore trajectories are changing in a complex manner. The proportion of ultra-deep wells, horizontal wells, and highly deviated wells is increasing year by year. Traditional open-hole wells mostly use wireline logging, which has disadvantages such as difficulty in inserting the instrument into the well, low logging efficiency, and difficulty in handling obstructions and stuck pipe. It can no longer fully meet the needs of such complex logging. Multi-mode through-drill-string logging tools are a high-end technical tool that effectively solves this problem. The instrument has an outer diameter of only 50-60mm, featuring miniaturization and high reliability. During well cleaning, the logging instrument is inserted through the drill string, and logging is performed using a cableless storage method, allowing logging to be performed wherever the drill string goes. This significantly improves safety, efficiency, and stability. If the instrument encounters obstruction / stuck pipe in the event of wellbore collapse, shale expansion, or other situations, it can be retrieved at any time, greatly reducing the risk of stuck pipe and ensuring wellbore safety.

[0003] Lateral logging, as an important electrical logging technique in this series, is mainly used for measuring the resistivity of conductive mud formations, and is particularly suitable for high-resistivity formations in saline mud environments. Currently, commercially available conventional through-drilling tools with dual lateral logging can only provide two resistivity curves, one deep and one shallow, with a vertical resolution of 0.6m and a measurement dynamic range of only 0.2–40000 Ω·m. These limitations result in low vertical resolution and a narrow dynamic range, failing to meet the needs of detailed formation exploration and development. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low longitudinal resolution and narrow dynamic range in existing technologies, which cannot meet the needs of fine exploration and development of formations, and to provide a multi-mode over-drill array lateral acquisition and processing circuit, logging method and logging instrument.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention proposes a multi-mode lateral acquisition and processing circuit for drill string arrays, comprising:

[0007] The analog signal acquisition module is used to acquire analog signals from the lateral electrode system of the drill string array;

[0008] The preamplifier circuit is used to reduce the noise of the analog signal and transmit the processed signal to the mixing weak signal detection module.

[0009] The frequency mixing weak signal detection module is used to receive amplified analog signals and transmit the processed analog signals to the main control acquisition module;

[0010] The main control acquisition module is used to control the mixing weak signal detection module to acquire and preprocess downhole electrical signals in real time, and to issue control commands to the mixing weak signal detection module.

[0011] The signal source generation module is used to filter and gain-condition the signal generated by the main control acquisition module and output a sinusoidal analog signal.

[0012] Preferably, it also includes a communication interface module for transmitting downhole instrument control commands issued from the ground to the main control acquisition module.

[0013] Preferably, it also includes a storage module for storing data from the main control acquisition module.

[0014] Preferably, the storage module is connected to the host computer via an RS485 interface.

[0015] Preferably, the noise reduction process for the analog signal by the preamplifier circuit is as follows:

[0016] The signals from the first monitoring electrode M1, the second monitoring electrode M2, the third monitoring electrode M0′, and the fourth monitoring electrode M1′ are processed by the main monitoring transformer, then differentially amplified, and then multi-stage bandpass filtered and amplified. One path is amplified by programmable gain to obtain the current signal, and the second path is transmitted to the main electrode A0 through negative feedback control.

[0017] The signals from the third monitoring electrode M0′ and the fourth monitoring electrode M1′ are processed by a DC blocking transformer, then filtered and amplified, and finally amplified by a programmable gain amplifier to obtain a voltage signal.

[0018] The signals from the first monitoring electrode M1 and the reference electrode N are processed by a DC blocking transformer, then filtered and amplified, and then amplified by a programmable gain amplifier to obtain the voltage difference signal.

[0019] The lateral electrode system of the drill string array includes a first monitoring electrode M1, a second monitoring electrode M0, a third monitoring electrode M0′, a fourth monitoring electrode M1′, a reference electrode N, and a main electrode A0.

[0020] Preferably, the signals from the third monitoring electrode M0′ and the fourth monitoring electrode M1′ are processed by a DC blocking transformer and then amplified by narrowband filtering.

[0021] The signals from the first monitoring electrode M1 and the reference electrode N are processed by a DC blocking transformer and then amplified by a bandpass filter.

[0022] The present invention proposes a logging method with multi-mode over-drill array lateral acquisition and processing circuit, comprising the following steps:

[0023] The main control acquisition module generates a signal that is transmitted to the signal source conditioning module for filtering and gain conditioning, and outputs a sinusoidal analog signal.

[0024] The preamplifier circuit receives the sinusoidal analog signal, performs noise reduction processing on the analog signal, and transmits the processed signal to the mixing weak signal detection module.

[0025] The mixed-frequency weak signal detection module transmits the processed analog signal to the main control acquisition module. The main control acquisition module processes the analog signal to obtain the resistivity, realizing multi-mode lateral logging through the drill string array.

[0026] Preferably, the noise reduction process for the analog signal by the preamplifier circuit is as follows:

[0027] The signals from the first monitoring electrode M1, the second monitoring electrode M2, the third monitoring electrode M0′, and the fourth monitoring electrode M1′ are processed by the main monitoring transformer, then differentially amplified, and then multi-stage bandpass filtered and amplified. One path is amplified by programmable gain to obtain the current signal, and the second path is transmitted to the main electrode A0 through negative feedback control.

[0028] The signals from the third monitoring electrode M0′ and the fourth monitoring electrode M1′ are processed by a DC blocking transformer, then filtered and amplified, and finally amplified by a programmable gain amplifier to obtain a voltage signal.

[0029] The signals from the first monitoring electrode M1 and the reference electrode N are processed by a DC blocking transformer, then filtered and amplified, and then amplified by a programmable gain amplifier to obtain the voltage difference signal.

[0030] The lateral electrode system of the drill string array includes a first monitoring electrode M1, a second monitoring electrode M0, a third monitoring electrode M0′, a fourth monitoring electrode M1′, a reference electrode N, and a main electrode A0.

[0031] Preferably, the main control acquisition module processes the analog signal to obtain the resistivity, specifically as follows:

[0032] mud resistivity Where, ΔV M0M1(f0) To detect the potential difference between the second monitoring electrode M0 and the first monitoring electrode M1, KAL0 is the instrument constant, and f0 is used for mud resistivity measurement.

[0033] Apparent resistivity of each mode Where i is an integer greater than 0 and not greater than 5; where I0 (i) To measure the emission current of the main electrode, V m1_N(i) KALi is the potential signal between the main monitoring electrode and the reference electrode, KALi is the instrument constant corresponding to the i-th operating mode, and Ci is the normalized calibration coefficient of the measurement channel corresponding to the i-th operating mode.

[0034] A logging tool employs a multi-mode lateral acquisition and processing circuit over the drill string array.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] This invention proposes a multi-mode lateral acquisition and processing circuit for drilling arrays. Considering signal noise reduction, a preamplifier circuit is used to lower the signal noise level, improve the signal-to-noise ratio, and ensure undistorted signal amplification. It also covers a wider frequency range to improve response capability at different formation depths. A mixing weak signal detection module enhances the detection capability of weak signals, enabling simultaneous detection of signals in different frequency bands, thereby improving the resolution capability at different formation depths. The main control acquisition module can more accurately control the working state of the mixing weak signal detection module, achieving fine acquisition and preprocessing of downhole electrical signals. The signal source generation module ensures the stability and accuracy of the output sinusoidal analog signal. Multiple acquisition modes are designed according to different exploration needs, such as high-resolution mode and wide dynamic range mode. Optimal acquisition results are achieved by adjusting the operating parameters of the preamplifier circuit, mixing weak signal detection module, and signal source generation module in different modes. Therefore, the multi-mode over-drill array lateral acquisition and processing circuit proposed in this invention can significantly improve the longitudinal resolution and dynamic range of measurements, thereby meeting the needs of fine exploration and development of formations, helping to more accurately detect the structure and properties of formations, and providing strong technical support for oil and gas exploration and development. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a structural diagram of the multi-mode over-drill array lateral acquisition and processing circuit of the present invention.

[0039] Figure 2 This is a structural diagram of the preamplifier circuit of the present invention.

[0040] Figure 3 This is a connection diagram of the storage module of the present invention.

[0041] Figure 4The diagram shows the lateral working modes of the drill string array of the present invention: (a) mud measurement mode AL0 mode for detecting mud resistivity information, (b) shallow lateral measurement mode AL1 mode for detecting resistivity curves at different radial depths, (c) medium-shallow lateral measurement mode AL2 mode for detecting resistivity curves at different radial depths, (d) medium lateral measurement mode AL3 mode for detecting resistivity curves at different radial depths, (e) medium-deep lateral measurement mode AL4 mode for detecting resistivity curves at different radial depths, and (f) deep lateral measurement mode AL5 mode for detecting resistivity curves at different radial depths. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present 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 the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0048] The present invention will now be described in further detail with reference to the accompanying drawings:

[0049] This invention proposes a multi-mode lateral acquisition and processing circuit for drill string arrays, such as... Figures 1 to 3 As shown, it includes an analog signal acquisition module, a preamplifier circuit, a mixer weak signal detection module, a main control acquisition module, a signal source generation module, a communication interface module, and a storage module;

[0050] The analog signal acquisition module is used to acquire analog signals from the lateral electrode system of the drill string array;

[0051] The preamplifier circuit is used to reduce the noise of the analog signal and transmit the processed signal to the mixing weak signal detection module.

[0052] The frequency mixing weak signal detection module is used to receive amplified analog signals and transmit the processed analog signals to the main control acquisition module;

[0053] The main control acquisition module is used to control the mixing weak signal detection module to acquire and preprocess downhole electrical signals in real time, and to issue control commands to the mixing weak signal detection module.

[0054] The signal source generation module is used to filter and gain-condition the signal generated by the main control acquisition module and output a sinusoidal analog signal.

[0055] The communication interface module is used to send downhole instrument control commands issued from the ground to the main control acquisition module.

[0056] The storage module is used to store data from the main control acquisition module.

[0057] The storage module is connected to the host computer via an RS485 interface.

[0058] The steps of the preamplifier circuit in performing noise reduction processing on the analog signal are as follows:

[0059] The signals from the first monitoring electrode M1, the second monitoring electrode M2, the third monitoring electrode M0′, and the fourth monitoring electrode M1′ are processed by the main monitoring transformer, then differentially amplified, and then multi-stage bandpass filtered and amplified. One path is amplified by programmable gain to obtain the current signal, and the second path is transmitted to the main electrode A0 through negative feedback control.

[0060] The signals from the third monitoring electrode M0′ and the fourth monitoring electrode M1′ are processed by a DC blocking transformer, then filtered and amplified, and finally amplified by a programmable gain amplifier to obtain a voltage signal; among them, the signals from the third monitoring electrode M0′ and the fourth monitoring electrode M1′ are processed by a DC blocking transformer and then amplified by a narrowband filter.

[0061] The signals from the first monitoring electrode M1 and the reference electrode N are processed by a DC blocking transformer, then filtered and amplified, and finally amplified by a programmable gain amplifier to obtain the voltage difference signal; wherein, the signals from the first monitoring electrode M1 and the reference electrode N are processed by a DC blocking transformer, then amplified by a bandpass filter.

[0062] The lateral electrode system of the drill string array includes a first monitoring electrode M1, a second monitoring electrode M0, a third monitoring electrode M0′, a fourth monitoring electrode M1′, a reference electrode N, and a main electrode A0.

[0063] The following is a detailed description of the multi-mode over-drill array lateral acquisition and processing circuit:

[0064] 1) Construction of a high-resolution over-drill array lateral electrode system: The over-drill array lateral electrode system has an outer diameter of only 55mm, an overall length of 8.78m, a longitudinal resolution of 0.3m, and a temperature and pressure resistance of 175℃ / 140MPa. It consists of 25 electrodes, including one main electrode A0, 12 shielding electrodes symmetrically distributed around A0 (upper half: A1′, A2′, A3′, A4′, A5′, A6′; lower half: A1, A2, A3, A4, A5, A6), and 12 monitoring electrodes symmetrically distributed around A0 (upper half: M0′, M1′, M2′, M3′, M4′, M5′; lower half: M0, M1, M2, M3, M4, M5). PEEK rings are used for electrical insulation between adjacent electrodes. To reduce instrument installation length and facilitate transportation and wellhead installation, the upper A5′, A6′ and lower A5, A6 are separated from the main electrode system using isolators. Circuit modules are placed on the electronic instrument skeleton inside the upper A5′ electrode, while the electronic instrument skeleton inside the lower A5 electrode is a through-wire. The upper A6′ electrode uses a telemetry or wellbore inclination-connecting shell, and the lower A6 electrode uses an acoustic or other instrument shell. The electrode system contains a fiberglass pressure-bearing core rod with a central open ring to ensure through-wire connection. Grooves are engraved on the surface, and copper strips are embedded. Metal connectors at fixed positions maintain good contact between the electrode ring and the copper strips, and wires lead to the pressure-bearing sealing plug at the upper end (A4′) of the electrode system. The main electrodes A0, main monitoring electrodes M0, M1 and M0′, M1′ directly connect to the preamplifier circuit board; the shielding electrodes A1~A4 and A1′~A4′ are connected to their respective auxiliary focusing transformers; and the auxiliary monitoring electrodes M2~M5 and M2′~M5′ are connected to their respective auxiliary focusing control circuit boards. Among them, M1 is also known as the first supervisory electrode, M0 is also known as the second supervisory electrode, M0′ is also known as the third supervisory electrode, and M1′ is also known as the fourth supervisory electrode.

[0065] 2) Construction of a multi-mode over-drill array lateral acquisition and processing circuit: Due to the limitations of the logging tool's outer diameter and the internal space of the pressure-bearing shell, a highly integrated, low-power, all-in-one design method is adopted, placing the main control acquisition module, signal source generation module, and mixed-frequency weak signal detection module on a single circuit board. The board is 300mm long and 34mm wide, and all major electronic components are low-power, high-temperature military-grade, ensuring high reliability and stable operation of the instrument in a downhole environment of 175℃.

[0066] The main control acquisition module, as the core control circuit, adopts an FPGA+DSP architecture. In the FPGA, direct digital frequency synthesis technology is used to generate six different digital sine wave signals to provide a current source (screen current source) for the shielding electrodes of downhole instruments. At the same time, it controls the weak signal detection module to acquire and preprocess downhole electrical signals in real time. In the DSP, functions such as digital phase-sensitive detection processing, apparent resistivity calculation, screen current source power adjustment, communication with the host computer, and control of the storage module are implemented.

[0067] The signal generation module filters and gains-conditions the digital sine wave signal generated by the FPGA, outputting six sinusoidal analog signals at frequencies of f0: 996Hz, f1: 276Hz, f2: 228Hz, f3: 180Hz, f4: 132Hz, and f5: 84Hz. f0 is used to measure mud resistivity and is directly connected to the main electrode A0; f1 through f5 are used to measure formation resistivity and are connected to the corresponding shielded electrode auxiliary focusing transformers.

[0068] The mixer weak signal detection module is used to detect and preprocess three analog signals from the preamplifier board: current signal I0, voltage Vm1_N, and voltage difference ΔV. M0M1(f0) After bandpass filtering and analog-to-digital conversion, the resulting mixed digital signal is sent to the analog-to-digital conversion unit of the main control acquisition module for processing. An eight-channel 24-bit high-precision analog-to-digital converter is used to perform real-time high-fidelity conversion on the three-channel analog signals after conditioning. The resulting digital signal is then sent serially to the FPGA+DSP unit of the main control acquisition module for digital phase-sensitive detection processing and related calculations.

[0069] The communication interface module, also known as the CAN interface communication module, is used to receive downhole instrument status control commands from the ground acquisition and control software via remote transmission short sections in the form of remote frames or extended frames, and to upload downhole data in real time.

[0070] The preamplifier circuit is placed at the top of the electrode system to reduce noise interference on the electrode leads. Its function is to transmit the current signal I0, voltage Vm1_N, and voltage difference ΔV containing formation information. M0M1(f0) The three analog signals undergo DC blocking, bandpass filtering, and variable gain amplification (PGA) to increase the original signal amplitude to the mV level or higher, aiming to improve the signal-to-noise ratio. They are then transmitted to the mixing weak signal detection module through a single-core shielded cable.

[0071] According to the measurement requirements, it is necessary to detect the current I0 of the main electrode A0, which includes the mixed signal f1 to f5. In the high-resistivity layer, the signal is only in the tens of nV range. In order to improve the signal-to-noise ratio, a programmable gain amplifier (PGA) circuit is used in the next stage with gain levels of 1, 10, 100, and 1000 to boost the original signal amplitude to the mV level and form the current signal I0 to be detected. The signal is then transmitted to the main control acquisition module using a single-core shielded cable.

[0072] According to the measurement requirements, it is necessary to detect the voltage difference signal of the main supervisory electrode, which contains only one useful signal, f0, with a frequency of 996Hz, much higher than the other frequency signals f1 to f5. Therefore, this signal is processed using DC blocking, narrowband filtering, and PGA to form the potential difference signal ΔV to be detected. M0M1(f0) The data is transmitted to the main control acquisition module using a single-core shielded cable.

[0073] According to the measurement requirements, it is necessary to detect the potential signal between the main supervisory electrodes M1 and M1′ and the reference electrode N. Since the signal amplitude itself is above mV, it is also subjected to DC blocking, bandpass filtering and PGA processing to form the potential signal Vm1_N to be detected, which is then transmitted to the main control acquisition module using a single-core shielded wire.

[0074] The storage unit utilizes the abundant digital I / O ports of the DSP to control the high-temperature, high-capacity NAND-Flash memory chip and incorporates a reliable file system. Besides sending measurement data to the CAN bus, it also stores the data in the NAND-Flash in real time. After measurement completion, it connects to a PC via the DSP's extended RS485 interface to perform operations such as reading and deleting stored data. The storage system design fully considers factors such as dual data backup, ECC verification, and NAND-FALSH wear leveling.

[0075] The present invention proposes a logging method with multi-mode over-drill array lateral acquisition and processing circuit, comprising the following steps:

[0076] Step 1: The main control acquisition module generates a signal and transmits it to the signal source conditioning module for filtering and gain conditioning, outputting a sinusoidal analog signal;

[0077] Step 2: The preamplifier circuit receives the sinusoidal analog signal, performs noise reduction processing on the analog signal, and transmits the processed signal to the mixing weak signal detection module.

[0078] Step 3: The mixed-frequency weak signal detection module transmits the processed analog signal to the main control acquisition module. The main control acquisition module processes the analog signal to obtain the resistivity, realizing multi-mode lateral logging through the drill string array.

[0079] The main control acquisition module processes the analog signal to obtain the resistivity, specifically as follows:

[0080] The multi-mode drilling array has six working modes and measures six curves. In the first mode, AL0, the mud resistivity is primarily measured. A constant current source sinusoidal signal with a frequency of 996Hz and an amplitude of 1mA is set at f0. The current flows out from the main electrode A0 and, due to lack of focus, returns to electrode A1. The potential difference ΔV between the main monitoring electrodes M0 (M0′) and M1 (M1′) is detected. M0M1(f0) The measured value of mud resistivity RAL0 can be obtained using the following formula:

[0081] mud resistivity Where, ΔV M0M1(f0) To detect the potential difference between the second monitoring electrode M0 and the first monitoring electrode M1, KAL0 is the instrument constant, and f0 is used for mud resistivity measurement, which is different from f1 to f5 in the formation resistivity measurement formula.

[0082] The remaining five operating modes, AL1 to AL5, employ a three-sided operating method, obtaining resistivity curves at different detection depths by changing the position of the plate current return electrode. The circuit utilizes full hardware focusing control technology and a constant power approach, measuring the main electrode emission current I0. (i) and the potential signal V between the main supervisory electrode and the reference electrode m1_N(i) The apparent resistivity measurement values ​​for each mode are obtained using the following formula.

[0083] Apparent resistivity of each mode i takes an integer greater than 0 and not greater than 5; where I0 (i) To measure the emission current of the main electrode, V m1_N(i) The potential signal between the main monitoring electrode and the reference electrode is denoted as KALi, where KALi is the instrument constant corresponding to the i-th operating mode, and Ci is the normalized calibration coefficient of the measurement channel corresponding to the i-th operating mode. Because the same mixing detection circuit system responds slightly differently to signals of different frequencies, Ci is introduced as the normalized calibration coefficient of the measurement channel corresponding to the i-th operating mode, ranging from 0.95 to 1.05, to more accurately determine the formation resistivity.

[0084] Six operating modes: AL0 mode detects mud resistivity information for real-time wellbore environment correction. In most cases, the resistivity of conductive mud is between 0.01 and 10 Ω·m, with a small dynamic range, and is achieved using a constant current method. The shallow lateral AL1, medium-shallow lateral AL2, medium lateral AL3, medium-deep lateral AL4, and deep lateral AL5 measurement modes detect resistivity curves at different radial depths. Their dynamic range is between 0.2 and 100,000 Ω·m, with a large dynamic range and requiring high measurement accuracy, and are achieved using a constant power method. Figure 4 As shown.

[0085] This invention proposes a multi-mode through-drill array lateral acquisition and processing circuit, forming a multi-mode through-drill array lateral logging tool. In a single well run, it can acquire five formation resistivity curves and mud resistivity curves at different radial depths from the wellbore to the formation, with a uniform 0.3m vertical resolution and a measurement dynamic range of only 0.2–100,000 Ω·m, providing more reliable data for accurate identification of oil and gas layers. This logging instrument can be used as a small-bore logging tool for real-time cable logging data transmission, and also as a storage-type through-drill array logging tool. A single well run can acquire five formation resistivity curves and mud resistivity curves at different radial depths from the wellbore to the formation, with a uniform 0.3m vertical resolution. Through inversion, the true formation resistivity can be obtained, which can be used to delineate thin layers, determine the oil-water interface, describe formation invasion characteristics, and determine formation oil saturation, providing more reliable data for accurate identification of oil and gas layers. It is an important means of acquiring formation resistivity in complex wells such as horizontal wells with large displacement, highly deviated wells, and ultra-deep wells. Based on the principle of repulsion between like charges of current, focusing electrodes (shielding electrodes) are placed above and below the main electrode. The current generated by the shielding electrodes forces the main current to flow into the formation in a direction perpendicular to the well axis (laterally), reducing the influence of the wellbore and surrounding rock, and making the measurement results more accurately reflect the original formation resistivity. The formation resistivity value is obtained by detecting the main electrode current signal containing formation information and the potential difference signal between the main monitoring electrode and the reference N electrode through a preamplifier circuit, based on Ohm's law and the electrode system K value. Due to the shielding electrode, the return paths of signals from different frequencies are different, thus enabling the detection of resistivity information at different radial depths.

[0086] This invention overcomes key technological challenges such as highly integrated, high-temperature resistant, and low-power circuitry in confined spaces, and high-strength pressure resistance, resulting in a multi-mode, over-the-drill array lateral logging tool with an outer diameter of only 55mm, capable of withstanding 175℃ / 140MPa pressure. Compared to existing 76mm small-diameter, ultra-high-temperature (230℃) and conventional 90mm array lateral logging tools at 175℃, the over-the-drill array lateral logging tool developed in this invention reduces power consumption by over 35%, instrument weight by over 60%, and manufacturing costs by over 30%. Implementation results show that this multi-mode, over-the-drill array lateral logging tool and measurement method possess advantages such as strong vertical stratification capability, wide dynamic range for resistivity measurement, high measurement accuracy, and significant radial invasion characteristics.

[0087] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-mode across-tool array lateral acquisition processing circuit, comprising: The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

2. The multi-mode across-tool array lateral acquisition processing circuit of claim 1, wherein, The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

3. The multi-mode across-tool array lateral acquisition processing circuit of claim 1, wherein, The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

4. The multi-mode across-tool array lateral acquisition processing circuit of claim 3, wherein, The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

5. The multi-mode across-tool array lateral acquisition processing circuit of claim 1, wherein, The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

6. The multi-mode across-tool array lateral acquisition processing circuit of claim 5, wherein, The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

7. A method of logging using a multi-mode across-tool array lateral acquisition processing circuit, comprising: The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit.

8. The method of claim 7, wherein, The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through-drilling tool array lateral acquisition processing circuit. The application relates to a multi-mode through The signals of the third monitoring electrode M0' and the fourth monitoring electrode M1' are subjected to isolation transformer processing, then filtered and amplified, and then subjected to programmable gain amplification to obtain a voltage signal; The signals of the first monitoring electrode M1 and the reference electrode N are subjected to isolation transformer processing, then filtered and amplified, and then subjected to programmable gain amplification to obtain a voltage difference signal; The over-drilling tool array lateral electrode system comprises a first monitoring electrode M1, a second monitoring electrode M0, a third monitoring electrode M0', a fourth monitoring electrode M1', a reference electrode N and a main electrode A0.

9. The method of claim 7 wherein, The main control acquisition module processes the analog signal to obtain a resistivity, specifically as follows: Mud resistivity where ΔV M0M1(f0) is the potential difference between the second supervision electrode M0 and the first supervision electrode M1, K AL0 is an instrument constant, f0 is for mud resistivity measurement; Each mode view resistivity Wherein, i takes an integer greater than 0 and not greater than 5; wherein, I0 (i) V is the emission current of the main electrode by measuring, m1_N(i) K is the potential signal between the main supervisory electrode and the reference electrode, ALi Ki is the instrument constant corresponding to the i-th working mode, and Ci is the normalized calibration coefficient of the measurement channel corresponding to the i-th working mode.

10. A logging tool, characterized by The multi-mode over-drilling tool array lateral acquisition processing circuit of any one of claims 1-6 is adopted.

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