Array induction instrument coil system generation method and device and electronic equipment

Abstract

The invention discloses an array induction instrument coil system generation method and device and electronic equipment. The method comprises the following steps: based on a main receiving coil source distance and a main receiving coil turn number of each three-coil system subarray, determining a corresponding shielding receiving coil initial source distance and a shielding receiving coil theoretical balance turn number; based on the source spacing of the main receiving coil, the number of turns of the main receiving coil and the corrected number of turns of the shielding receiving coil, determining the balance source spacing of the shielding receiving coil of each three-coil system subarray; and under the condition that each three-coil system sub-array is reasonably designed, obtaining a coil system generation result according to the source spacing of the main receiving coil, the number of turns of the main receiving coil, the corrected number of turns of the shielding receiving coil, the balanced source spacing of the shielding receiving coil and the number of turns of the transmitting coil. According to the method, the problems of unreasonable design and generation of the array induction instrument coil system and poor instrument applicability caused by incomplete consideration of factors during optimization design of the array induction instrument coil system in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the field of array induction instrument design, and in particular to a method, device and electronic equipment for generating a coil system of an array induction instrument. Background Art

[0002] Induction logging is a logging method that uses the principle of mutual induction of alternating current to measure the resistivity of the formation. The working principle of the array induction instrument is that the transmitting coil generates an alternating current, which induces an eddy current in the formation, and this eddy current induces a secondary induced electromotive force in the receiving coil. Since the size of the induced eddy current in the formation is related to the resistivity of the formation, the electromotive force induced in the receiving coil can reflect the resistivity information of the formation. The coil system of the array induction instrument includes a transmitting coil, a plurality of receiving coils composed of a main receiving coil and a shielded receiving coil wound in reverse, and other coil units. The source distance and the number of turns of each coil need to comprehensively consider the detection performance such as the longitudinal resolution and radial detection depth of the instrument, the measurement signal magnitude and signal-to-noise ratio, the dynamic range of resistivity measurement and the calibration error of the instrument, the direct coupling balance design and direct coupling balance adjustment, the space accommodation and the instrument assembly and other factors. At present, the design practice of the coil system of the array induction instrument often relies on the personal experience of engineers, without a set of clear design principles and complete design methods and processes, which often leads to unreasonable design and generation of the coil system of the array induction instrument and poor applicability of the instrument. Summary of the invention

[0003] The embodiments of the present invention provide a method, device and electronic device for generating a coil system of an array induction instrument, which solve the technical problem in the related art that factors are not fully considered when optimizing the coil system of an array induction instrument, resulting in unreasonable design and generation of the coil system of the array induction instrument and poor applicability of the instrument.

[0004] According to one aspect of an embodiment of the present invention, a method for generating a coil system of an array induction instrument is provided, comprising: determining the number of turns of a common transmitting coil of a plurality of three-coil system subarrays of an array induction instrument; wherein the plurality of three-coil system subarrays comprise a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively comprise a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system subarray comprises the common transmitting coil, a main receiving coil and a shielded receiving coil; for each of the three-coil system subarrays in the plurality of three-coil system subarrays, determining the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system subarray; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system subarray, determining the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system subarray; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; the theoretical balanced number of turns of the shielded receiving coil is the distance that satisfies the direct coupling Theoretically calculated turns of the balance formula; based on the main receiving coil source distance, the main receiving coil turns and the corrected shielding receiving coil turns of each three-coil system sub-array, determine the shielding receiving coil balanced source distance of each three-coil system sub-array; wherein the corrected shielding receiving coil turns are corrected based on the theoretical balanced turns of the shielding receiving coil, and the corrected shielding receiving coil turns are an integer or an even number; the shielding receiving coil balanced source distance is the theoretical calculated source distance that satisfies the direct coupling balance formula; the common transmitting coil turns of each three-coil system sub-array and the The main receiving coil source distance, the number of turns of the main receiving coil, the balanced source distance of the shielding receiving coil, and the corrected number of turns of the shielding receiving coil are subjected to a spatial accommodation analysis to obtain an analysis result; when the analysis result indicates that the structure and assembly relationship of each three-coil system sub-array in the array sensing instrument are reasonably designed, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the number of turns of the main receiving coil, the corrected number of turns of the shielding receiving coil, the balanced source distance of the shielding receiving coil, and the number of turns of the transmitting coil of each three-coil system sub-array.

[0005] According to another aspect of an embodiment of the present invention, a coil system generating device for an array induction instrument is provided, comprising: a first determining module, used to determine the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of the array induction instrument; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes the common transmitting coil, a main receiving coil and a shielded receiving coil; a second determining module, used to determine the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of the array induction instrument; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes the common transmitting coil, a main receiving coil and a shielded receiving coil; For each three-coil system subarray in the subarray, determine the main receiving coil source distance and the number of main receiving coil turns of each three-coil system subarray; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; a third determination module is used to determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system subarray based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system subarray; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; the theoretical balanced number of turns of the shielded receiving coil is to satisfy The fourth determination module is used to determine the shielded receiving coil balanced source distance of each three-coil system sub-array based on the main receiving coil source distance of each three-coil system sub-array, the main receiving coil turns and the corrected shielded receiving coil turns; wherein the corrected shielded receiving coil turns are corrected based on the theoretical balanced turns of the shielded receiving coil, and the corrected shielded receiving coil turns are an integer or an even number; the shielded receiving coil balanced source distance is the theoretical calculated source distance that satisfies the direct coupling balance formula; an analysis module is used to analyze the common transmission line of each three-coil system sub-array The invention relates to a method for performing a spatial accommodation analysis on the number of turns of the three-coil system and the main receiving coil source distance, the number of turns of the main receiving coil and the balanced source distance of the shielded receiving coil, and the corrected number of turns of the shielded receiving coil to obtain an analysis result; and an acquisition module, for obtaining a coil system generation result of the array sensing instrument according to the main receiving coil source distance, the number of turns of the main receiving coil, the corrected number of turns of the shielded receiving coil, the balanced source distance of the shielded receiving coil, and the number of turns of the transmitting coil of each three-coil system subarray, when the analysis result indicates that the structure and assembly relationship of each three-coil system subarray in the array sensing instrument are reasonably designed.

[0006] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, wherein the non-volatile storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executing any one of the array induction instrument coil system generation methods.

[0007] According to another aspect of an embodiment of the present invention, there is also provided an electronic device, comprising one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the methods for generating a coil system of an array induction instrument.

[0008] In an embodiment of the present invention, the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of an array induction instrument is determined; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes the common transmitting coil, a main receiving coil and a shielded receiving coil; for each of the plurality of three-coil system sub-arrays, the number of turns of the main receiving coil of each three-coil system sub-array is determined. Coil source distance, main receiving coil turns; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; based on the main receiving coil source distance and the number of main receiving coil turns of each three-coil system sub-array, determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; the theoretical balanced number of turns of the shielded receiving coil is the theoretical calculated number of turns that satisfies the direct coupling balance formula; based on the The main receiving coil source distance, the main receiving coil turns and the corrected shielding receiving coil turns are used to determine the shielding receiving coil balanced source distance of each three-coil system sub-array; wherein the corrected shielding receiving coil turns are corrected based on the theoretical balanced turns of the shielding receiving coil, and the corrected shielding receiving coil turns are an integer or an even number; the shielding receiving coil balanced source distance is a theoretical calculated source distance that satisfies the direct coupling balance formula; a spatial accommodation analysis is performed on the common transmitting coil turns, the main receiving coil source distance, the main receiving coil turns, the shielding receiving coil balanced source distance and the corrected shielding receiving coil turns of each three-coil system sub-array to obtain an analysis result; when the analysis result indicates that the structure and assembly relationship of each three-coil system sub-array in the array sensing instrument are reasonably designed, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns of each three-coil system sub-array, thereby solving the technical problem of intelligent optimization design of the coil system of the array sensing instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0010] Figure 1 It is a schematic diagram of the electromagnetic induction relationship between a coil and a formation according to the prior art;

[0011] Figure 2 is a schematic diagram of an optional three-coil system structure according to an embodiment of the present invention;

[0012] Figure 3 This is a schematic diagram of an optional sub-array structure of an array sensing instrument according to an embodiment of the present invention;

[0013] Figure 4 It is a schematic diagram of a one-dimensional longitudinal differential geometric factor characterizing the longitudinal resolution capability of a subarray of a sensing instrument according to the prior art;

[0014] Figure 5 It is a schematic diagram of a one-dimensional radial differential geometric factor for characterizing radial detection characteristics of a subarray of a sensing instrument according to the prior art;

[0015] Figure 6 It is a schematic diagram of a one-dimensional radially integrated geometric factor characterizing the radial detection depth of a sensing instrument subarray according to the prior art;

[0016] Figure 7 It is a schematic diagram of a two-dimensional differential geometric factor for characterizing radial and longitudinal special measurement characteristics of a sensing instrument subarray according to the prior art;

[0017] Figure 8 is a flow chart of generating a coil system of an array induction instrument according to an embodiment of the present invention;

[0018] Fig. 9 is a schematic diagram of a result of generating a coil system of an optional array induction instrument according to an embodiment of the present invention;

[0019] Fig.10 is a flow chart of coil system generation of an optional array induction instrument according to an embodiment of the present invention;

[0020] Fig.11 The figure is a diagram of a coil system generation structure of an optional array induction instrument according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Geophysical logging is an important means of exploring and developing oil, gas, metals and other mineral resources by using physical means such as electromagnetic waves, sound waves, radioactivity, nuclear magnetic resonance, and optical fiber to identify the electromagnetic parameters, elastic mechanical parameters, and elemental properties of formation rocks and fluid media in rock pores.

[0024] In the process of oil exploration and development, after the potential oil and gas-bearing areas are identified through field geological surveys and geophysical exploration such as artificial seismic, gravity, electromagnetic and other means, wells will be drilled in the area. The logging process is to place instruments with detectors in the wellbore at different depths to perform various methods of measurement, and use sound, light, electricity, nuclear and other means to detect various physical properties of the formations around the wellbore at different depths. These physical properties have a specific relationship with the oil, gas, water and other fluids contained in the formation. Petroleum engineers can use logging to find oil and gas-bearing formations.

[0025] Oil and gas are stored in the pores of underground rocks. Generally, the pores of rocks contain either formation water or oil and gas. Oil and natural gas are not conductive or have very poor conductivity, while formation water, because it dissolves minerals in rocks, generally conducts electricity like salt water. During the generation and migration of oil and gas, the original formation water in the pores of rocks will gradually be partially or completely displaced by oil and gas, so the resistivity of rocks containing oil and gas will be higher than that of rocks containing formation water. Electrical logging uses the height of formation resistivity to determine the amount of oil and gas in the formation.

[0026] In oil and gas evaluation by petroleum logging, formation resistivity is an important parameter for estimating oil and gas reserves. Lateral logging, which uses electrodes to transmit direct current to the formation to establish an electric field, and induction logging, which uses alternating current in the transmitting coil to induce an eddy current field in the formation, are the two commonly used resistivity logging methods. Especially under the conditions of air drilling and non-conductive drilling media such as oil-based mud, the direct current logging method is no longer suitable for use, but induction logging is still applicable.

[0027] Induction logging is a logging method that uses the mutual induction principle of alternating current. The working principle of the instrument is that the transmitting coil generates an alternating current, which induces eddy currents in the formation, and this eddy current induces an electromotive force in the receiving coil. Since the transmitting coil and the receiving coil are both in the well, the intensity of the eddy current induced by the alternating current of the transmitting coil in the formation around the well is related to the conductivity of the formation, so the induced electromotive force of the receiving coil is a function of the conductivity of the surrounding formation.

[0028] The coil system is located in a uniform, isotropic, time-invariant formation, where the magnetic permeability μ, electrical conductivity σ, and dielectric constant ε are all constants; the formation is rotationally symmetric around the well axis; T and R are the transmitting coil and the receiving coil, respectively, and the number of turns of the transmitting coil is recorded as N T , the number of turns of the receiving coil is recorded as N R , the coil radius is r, L is the distance between the transmitting coil and the receiving coil, called the source distance. The coil works at a certain frequency ω. There is an alternating current I with constant amplitude and stable frequency on the transmitting coil. T , emission current I T =I0e -iωt . Since the alternating current in the transmitting coil excites the electromagnetic field in the surrounding strata, induced currents are generated in countless formation unit rings with the well axis as the axis. The magnitude of the induced current is proportional to the conductivity of the formation unit ring. These induced currents are similar to current coils and will also generate alternating electromagnetic fields, which are usually called secondary fields. The secondary field generates an induced electromotive force in the receiving coil, which is called the secondary field induced electromotive force. The electromagnetic induction relationship between the coil and the stratum is as follows Figure 1 shown.

[0029] In a uniform infinite medium, when the interaction between eddy currents is ignored, the secondary field induced electromotive force is proportional to the medium conductivity. The secondary induced electromotive force induced in the receiving coil carries the formation conductivity information, which is called a useful signal. The useful signal has a phase difference of 180 degrees with the alternating current of the transmitting coil. The induced electromotive force directly coupled from the transmitting coil to the receiving coil does not carry formation information, which is called a direct coupled electromotive force or a useless signal. The direct coupled electromotive force has a phase difference of 90 degrees with the alternating current of the transmitting coil. The secondary field induced electromotive force can be detected from the total signal using phase-sensitive detection technology, thereby achieving the purpose of measuring the resistivity of the surrounding formations.

[0030] For induction logging in uniform media, the induced electromotive force in the receiving coil can be deduced from electromagnetic field theory as follows:

[0031]

[0032] Where i is an imaginary unit, ω is the angular frequency, μ is the magnetic permeability (H / m), I T =I0e -iωt , I T is the emission current, I0 is the emission current amplitude, A T is the area of ​​the transmitting coil, A R is the receiving coil area, N T and N R are the number of turns of the transmitting coil and the receiving coil respectively, k is the wave number of the formation medium, k 2 =iωμσ. In the above formula, when the conductivity σ=0, that is, k=0, the direct-coupled electromotive force is:

[0033]

[0034] The direct-coupled signal (i.e., the direct-coupled electromotive force) is often tens to thousands of times larger than the secondary induced signal, which will overwhelm the secondary induced signal, resulting in an extremely low measurement signal-to-noise ratio. In order to accurately measure the secondary induced electromotive force, the instrument design adds a shielded receiving coil to offset or balance the direct-coupled signal. Figure 2 The three-coil subarray structure shown in the figure, namely a transmitting coil Tx and a pair of receiving coils Rm and Rb, Rm and Rb are respectively called the main receiving coil and the shielded receiving coil, the shielded receiving coil is also called the compensation receiving coil or the auxiliary receiving coil or the direct-coupled balanced coil. The two receiving coils are wound in reverse and connected together to form a receiving coil Rx. The transmitting coil Tx and the receiving coil Rx are combined and called a subarray A. Since the size of the useful secondary induction signal is inversely proportional to the source distance, and the size of the useless direct-coupled signal is inversely proportional to the cube of the source distance, in theory, the direct-coupled signal can be completely offset at the cost of sacrificing part of the useful signal by optimizing the number of turns and position of the shielded receiving coil. This is the basic principle of shielding the direct-coupled signal of the three-coil system. Assume that the distance from the center of the transmitting coil Tx to the center of the two receiving coils Rm and Rb is L respectively. m and L b , the number of turns of the receiving coil is N Rm and -N Rb The negative sign indicates that the shielded receiving coil is wound in the opposite direction to the main receiving coil. Since the strength of the direct-coupled signal is proportional to the inverse of the cube of the source distance And the number of turns of the receiving coil N R If the two receiving coils are wound in reverse, they are connected in series, and the number of turns and the source distance satisfy the following relationship:

[0035]

[0036] In theory, the direct-coupled signal can be offset, while the secondary signal generated by the formation vortex flow can be partially retained, thereby improving the signal-to-noise ratio of the instrument.

[0037] According to the principle of induction logging, the longer the source distance, the larger the detection range of the instrument, the deeper (farther) the detection range in the direction perpendicular to the wellbore (radial), but the poorer (lower) the resolution of thin layers along the wellbore (longitudinal). Conversely, the shorter the source distance, the shallower the radial detection depth of the instrument, and the stronger the longitudinal resolution of thin layers. In order to detect the formation conductivity of different depths and different areas around the wellbore and improve the resolution of thin layers, a composite coil system is designed, especially an array induction logging method in which multiple three-coil systems are optimized and combined. The wellbore correction and other processing are used to eliminate the environmental influence of the wellbore, the surrounding rock and other environmental influences are eliminated by software focusing and other processing, and the invasion parameters and original formation resistivity are obtained by radial inversion and other processing. It has the advantages of high vertical resolution, deep radial detection depth, and obvious invasion indication. Array induction instruments provide a variety of detection depths and formation resistivity information with multiple resolutions, which has become a powerful tool for oil and gas evaluation and is widely popular.

[0038] According to an embodiment of the present invention, a method embodiment for generating a coil system of an array induction instrument is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a pair of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0039] Figure 8 FIG. 4 is a flow chart of a method for generating a coil system of an array induction instrument according to an embodiment of the present invention. Figure 8 As shown, the method comprises the following steps:

[0040] Step S102, determining the number of turns of a common transmitting coil of a plurality of three-coil sub-arrays of an array sensing instrument; wherein the plurality of three-coil sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil sub-array includes a common transmitting coil, a main receiving coil and a shielded receiving coil.

[0041] Optionally, each three-coil system sub-array includes a common transmitting coil and a pair of receiving coils, each pair of receiving coils includes a main receiving coil and a shielding receiving coil, the main receiving coil and the shielding receiving coil are wound in opposite directions, the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil, and the shielding receiving coil source distance is the distance between the center of the transmitting coil and the center of the shielding receiving coil. Multiple three-coil system sub-arrays each include a common transmitting coil and a pair of receiving coils in multiple pairs of receiving coils. Figure 3 is a schematic diagram of an optional sub-array structure of an array sensing instrument according to an embodiment of the present invention; Figure 3 As shown, the array sensing instrument probe consists of a common transmitting coil Tx and multiple pairs (for example, 7 pairs) of receiving coils Rx; each coil sub-array formed by the receiving coil and the transmitting coil is a measurement unit. Multiple coil sub-arrays of the array sensing are installed on the same instrument core shaft or other structure.

[0042] In an optional embodiment, determining the number of turns of a common transmitting coil and the number of turns of a main receiving coil of multiple three-coil system sub-arrays of an array sensing instrument includes: determining the induced signal strength and the original signal-to-noise ratio of each three-coil system sub-array; and determining the number of turns of the common transmitting coil and the number of turns of the main receiving coil based on the induced signal strength and the original signal-to-noise ratio of each three-coil system sub-array.

[0043] Optionally, there is a certain correlation between the number of turns of the shared transmitting coil and the number of turns of the main receiving coil, and the magnitude of both is related to the induced signal strength of each three-coil system sub-array and the original signal acquisition signal-to-noise ratio. Therefore, the number of turns of the main receiving coil of each three-coil system sub-array and the number of turns of the shared transmitting coil can be comprehensively determined based on the induced signal strength and the original signal-to-noise ratio of each three-coil system sub-array. The specific process is as follows:

[0044] Step S1021, using the known number of turns of the common transmitting coil and the number of turns of the main receiving coil in combination with the transmitting current frequency and the transmitting current intensity design, the instrument constants of each subarray are calculated.

[0045] Step S1022, evaluate the induced signal strength and original signal noise ratio of each three-coil system array, calculate the digital accuracy of the instrument by combining the instrument constant, circuit amplification factor, analog-to-digital converter (ADC) bit number and ADC reference voltage, and compare it with the instrument accuracy design index.

[0046] Step S1023, iterative optimization: adjusting the number of turns of the common transmitting coil and the number of turns of the main receiving coil, recalculating, and evaluating the digital accuracy of the inductive conductivity and the dynamic range of conductivity measurement of the instrument.

[0047] Step S1024, convergence judgment: judge whether the optimization algorithm converges, that is, whether the optimal solution is reached. If the optimal solution is not reached, return to step S1023 for iterative optimization.

[0048] Step S1025, final result: when the optimization algorithm converges, the obtained number of turns of the shared transmitting coil and the number of turns of the main receiving coil are the best combination of the number of turns of the coils.

[0049] Step S104, for each of the three-coil sub-arrays in the plurality of three-coil sub-arrays, determining the main receiving coil source distance and the number of main receiving coil turns of each three-coil sub-array; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil.

[0050] In an optional embodiment, determining the main receiving coil source distance of each three-coil system subarray includes: determining the radial detection depth, longitudinal resolution and wellbore geometry factor corresponding to each three-coil system subarray; and determining the main receiving coil source distance of each three-coil system subarray based on the radial detection depth and longitudinal resolution of each three-coil system subarray and the wellbore geometry factor.

[0051] Optionally, when designing the instrument coil system, the technical specifications of the instrument should be considered first, including detection range, precision, accuracy, dynamic measurement range and other response and environmental factors. Among them, the geometric parameters that characterize the detection range are very important. Generally speaking, the geometric response characteristics of logging instruments are characterized by two parameters, namely: longitudinal resolution and detection depth. The main parameter that determines the longitudinal resolution and detection depth of the array sensor array is the source distance.

[0052] The contribution of different volume elements of the formation to the measurement is related to the position of the various volume elements relative to the logging instrument. The relative contribution of each volume element depends mainly on the physical processes related to the measurement method and the instrument geometry. The interaction between the spatial extent of these physical effects and the geometric dimensions of the instrument (the distance from the source to the detector) is extremely important.

[0053] The longitudinal response of a measurement system is determined by simulation, usually by dividing the surrounding strata into infinitely thin horizontal slices and integrating the differential geometric factors over the area of ​​each slice to obtain the longitudinal response function where g V (z) is the longitudinal differential geometry factor, which indicates the contribution weight of the unit thickness formation to the measurement signal at the longitudinal position z relative to the instrument measurement point (for a dual coil system, generally the center position of the transmitting coil and the receiving coil). VI (H) is the vertical integral geometric factor, which represents the total contribution weight of the formation with a thickness of H centered on the instrument measurement point to the measurement signal.

[0054] The definition of the longitudinal response function also ignores the possible correlation between the longitudinal and radial characteristics. After obtaining the longitudinal response function, a "longitudinal resolution" parameter can be determined based on certain characteristics of its shape. According to the side total point used, the currently used general definition can be divided into two types:

[0055] 1) Thin layer division - vertical resolution is the minimum distance between two changes in formation characteristics that the instrument can identify.

[0056] 2) Evaluation of thin layers - vertical resolution is the minimum thickness within which the parameters measured by the detector are related to the true value somewhere in the layer. This definition depends on how close to the true value is considered "close enough", and is generally defined as 90%. Figure 4 As shown in the figure, when the contribution of the formation to the total conductivity is 90%, the width of z is the thickness of the formation, and this thickness is basically equivalent to the distance between the transmitting coil and the receiving coil. Longitudinal detection is used to analyze the relative relationship between the horizontal conductive medium layer at different depths perpendicular to the coil system and the useful signal. The longitudinal detection characteristics characterize the instrument's ability to resolve the formation thickness. Generally, the longer the source distance of the subarray, the worse the subarray's ability to resolve the formation vertically.

[0057] When the rock physical properties of the formation do not vary with orientation, that is, it is axisymmetric. Assuming the formation is cylindrical, the geometric factor is only related to the distance between the formation area and the instrument axis, which is called the radial geometric factor. Figure 5 , Figure 6 As shown in the figure, the radial detection depth refers to the radial distance when the radial distance contributes 50% to the total conductivity. The radial detection characteristics reflect the contribution of the dielectric layer at different distances from the coil system axis to the useful signal, indicating the lateral detection characteristics of the coil system, that is, the relative contribution of the wellbore, the invasion zone and the original zone to the total conductivity. Generally, the longer the source distance of the subarray, the deeper the radial detection of the subarray to the formation.

[0058] In practical applications, in order to better describe the source of induction logging measurement signals and the vertical resolution and radial detection characteristics of induction logging instruments, one-dimensional geometric factors are further defined by two-dimensional geometric factors. The one-dimensional response function describes the radial and vertical detection characteristics of the instrument; the two-dimensional response function describes the influence of two-dimensional environments such as borehole, invasion, and surrounding rock during logging, such as Figure 7 As shown. They are the longitudinal differential geometric factors Among them, g(ρ,z) is a two-dimensional geometric factor, which represents the contribution weight of the formation unit ring per unit cross-sectional area to the measurement signal at the longitudinal position z relative to the instrument measurement point (generally the center position of the transmitting coil and the receiving coil) and the radial radius ρ perpendicular to the instrument axis. V(z) represents the integral of ρ, that is, the total weight of the contribution of the infinite stratum of unit thickness to the measurement signal at the vertical position z. As mentioned above, the vertical integral geometric factor Indicates the relative contribution of the horizontal stratum with a thickness of H at the vertical position z to the measurement signal; radial differential geometry factor It represents the relative contribution of a thin cylindrical formation with unit thickness and infinite length and radius ρ to the measurement signal; radial integral geometric factor: It represents the relative contribution of an infinite cylindrical formation with a radius of R to the measurement signal. Substituting different geometric factors into the above definition, the corresponding one-dimensional geometric factors can be obtained. According to the definitions of two-dimensional and one-dimensional geometric factors, the important use of geometric factors in induction logging can be obtained.

[0059] The two-dimensional geometric factors reflect the environmental influences of the borehole, flushing zone, invasion, and surrounding rock during logging. The radial differential and integral geometric factors describe the radial detection characteristics of the instrument; the integral geometric factor is used to define the radial detection depth of the instrument. In interpretation, the radial geometric factor is used to analyze the influence of radial formations such as the borehole, flushing zone, and invasion on the original formation. The vertical differential and vertical integral geometric factors describe the vertical detection characteristics of the instrument; the vertical integral geometric factor is used to define the vertical resolution of the instrument. In interpretation, the vertical geometric factor is used to analyze the vertical stratification capability of the instrument and the influence of the surrounding rock.

[0060] Optionally, in the process of designing the direct coupling balance of the coil system of the array induction instrument, it is necessary to consider the direct coupling balance problem of each coil system sub-array. The specific principle is as follows:

[0061] According to the electromagnetic field principle, the electromotive force induced by a unit magnetic dipole at a certain point in space in the receiving coil of the array induction logging tool is:

[0062] V=iωμ0N R A R H (Formula 4)

[0063] Where i is an imaginary unit, ω is the angular frequency, μ0 is the magnetic permeability (H / m), A R is the receiving coil area, N R is the number of turns of the receiving coil, H is the magnetic field strength at the receiving coil,

[0064]

[0065] Among them, r, z are the spatial cylindrical coordinates of the field point, k is the wave number of the formation medium, and k 2 =iωμσ, σ is the conductivity of the space medium. From formula (4), we can see that the phase difference between V and H is 90 degrees. Therefore, H can be expressed as two parts, the real part and the imaginary part, that is:

[0066] H=H'+iH" (Formula 6)

[0067] Substituting formula (6) into formula (4) yields:

[0068] V=-ωμ0N R A R H"+iωμ0N R A R H' (Formula 7)

[0069] From formula (7), we can know that the magnetic field signal of the induction receiving coil is the sum of the primary field and the secondary field. The primary field H' is the direct coupling magnetic field induced by the transmitting coil at the receiving coil position, which has nothing to do with the surrounding formation information. The secondary magnetic field H" is a signal related to the formation, which is the information to be measured by the induction logging instrument.

[0070] Under low-frequency electromagnetic field conditions, e ikr The first three terms of the Taylor expansion of Substituting into formula (5), after mathematical derivation, we can get the approximate expression of the magnetic field H:

[0071]

[0072] Formula (8) is derived based on the magnetic dipole. Considering the number of turns and area of ​​the transmitting coil, the secondary field or useful signal received by the receiving coil, that is, the real part of formula (7), is:

[0073]

[0074] When the conductivity σ=0, that is, k=0, the direct-coupled electromotive force is:

[0075]

[0076] Among them, I T =I0e -iωt , I T is the emission current, I0 is the emission current amplitude, A T is the area of ​​the transmitting coil, A R is the receiving coil area, N T and N R are the number of turns of the transmitting and receiving coils respectively.

[0077] From formula (9) and formula (10), it can be seen that the size of the useful secondary induction signal is inversely proportional to the source distance, while the useless direct coupling signal is inversely proportional to the cube of the source distance. In this way, in theory, the direct coupling signal can be completely offset by optimizing the number of turns and source distance of the shielding receiving coil, at the cost of sacrificing part of the useful signal. Therefore, in the optimization design of the three-coil system, in addition to eliminating the direct coupling signal by winding the two receiving coils in opposite directions and satisfying the source distance and number of turns of formula (3), it is also necessary to consider the magnitude and degree of sacrifice of the useful signal while eliminating the direct coupling signal, the consistency of the detection range of the shielding coil and the main receiving coil, and the direct coupling balance adjustment of the actual array sensing instrument.

[0078] Step S106, based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array, determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; and the theoretical balanced number of turns of the shielded receiving coil is the theoretically calculated number of turns that satisfies the direct coupling balance formula.

[0079] In an optional embodiment, based on the main receiving coil source distance and the number of main receiving coil turns of each three-coil system subarray, the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system subarray are determined, including: based on the main receiving coil source distance of each three-coil system subarray, determining the first ratio corresponding to each three-coil system subarray; based on the first ratio and the main receiving coil source distance of each three-coil system subarray, determining the initial source distance of the shielded receiving coil; based on the main receiving coil source distance, the number of main receiving coil turns and the initial source distance of the shielded receiving coil of each three-coil system subarray, determining the theoretical balanced number of turns of the shielded receiving coil of each three-coil system subarray.

[0080] Optionally, in the coil system optimization design of the induction instrument subarray, the first thing to consider is the detection performance issue, that is, the radial detection depth and longitudinal resolution of each three-coil system subarray. According to the detection performance index, the main receiving coil source distance of each three-coil system subarray can be determined through optimization and adjustment. Secondly, the induction signal strength of each three-coil system subarray and the signal-to-noise ratio of the original acquisition signal must be considered. Analyze and evaluate the instrument accuracy and measurement dynamic range, and determine the number of turns of the main receiving coil and the main receiving coil source distance of each three-coil system subarray through optimization and adjustment. Then, when the number of turns of the main receiving coil and the source distance of the main receiving coil are determined, the source distance of the shielded receiving coil and the number of turns of the shielded receiving coil are designed. The ratio of the initial source distance of the shielded receiving coil corresponding to the shielded receiving coil to the source distance of the main receiving coil is recorded, and the first ratio obtained is:

[0081]

[0082] Among them, β is the first ratio, L b is the distance from the center of the transmitting coil Tx to the center of the shielded receiving coil, denoted as the initial source distance of the shielded receiving coil, L m is the distance from the center of the transmitting coil Tx to the center of the main receiving coil, recorded as the main receiving coil source distance.

[0083] Further based on the first ratio of each three-coil system sub-array and the main receiving coil source distance, the initial source distance of the shielding receiving coil is determined as follows.

[0084] L b =βL m

[0085] Further based on the main receiving coil source distance, the number of main receiving coil turns and the initial source distance of the shielding receiving coil of each three-coil array, according to the above-mentioned balance condition formula (3), the theoretical balanced number of turns of the shielding receiving coil is determined as follows.

[0086]

[0087] Among them, N Rb is the number of turns of the shielded receiving coil calculated based on the direct coupling balance formula, denoted as the theoretical balanced number of turns of the shielded receiving coil; N Rm Number of turns of the main receiving coil.

[0088] Step S108, based on the main receiving coil source distance, the main receiving coil turns and the corrected shielding receiving coil turns of each three-coil system sub-array, determine the shielding receiving coil balanced source distance of each three-coil system sub-array; wherein the corrected shielding receiving coil turns are corrected based on the theoretical balanced turns of the shielding receiving coil, and the corrected shielding receiving coil turns are an integer or an even number; the shielding receiving coil balanced source distance is a theoretical calculated source distance that satisfies the direct coupling balance formula.

[0089] Optionally, the corrected number of turns of the shielded receiving coil is corrected based on the theoretical balanced number of turns of the shielded receiving coil. It should be noted that since the calculated theoretical balanced number of turns of the shielded receiving coil is usually not an integer, it is necessary to correct the obtained theoretical balanced number of turns of the shielded receiving coil to obtain a corrected shielded receiving coil source distance in the form of an integer or even number, on which the shielded receiving coil balanced source distance calculated is more accurate.

[0090] In an optional embodiment, based on the main receiving coil source distance, the number of main receiving coil turns and the corrected number of shielding receiving coil turns of each three-coil system subarray, the shielding receiving coil balanced source distance of each three-coil system subarray is determined, including: determining the second ratio of each three-coil system subarray based on the number of main receiving coil turns and the corrected number of shielding receiving coil turns of each three-coil system subarray; determining the shielding receiving coil balanced source distance of each three-coil system subarray based on the second ratio, the main receiving coil source distance, the number of main receiving coil turns and the corrected number of shielding receiving coil turns of each three-coil system subarray.

[0091] Optionally, since the number of turns must be an integer, or even an even number, the number of turns of the modified shielded receiving coil is taken as N' Nb = int(β 3 N Rm ) or an even number. Further based on the corrected number of turns of the shielded receiving coil and the initial main receiving coil source distance, the shielded receiving coil initial source distance is corrected to obtain the shielded receiving coil balanced source distance.

[0092] Optionally, after determining the corrected integer or even number of turns of the shielded receiving coil, the second ratio β' of each three-coil sub-array is obtained by formula (12). The specific calculation formula is as follows.

[0093]

[0094] Further use formula (11) to recalculate the shielded receiving coil balanced source distance L' b =β'L m . It can be seen that the key to the design of the shielded receiving coil lies in the determination of the second ratio β'. In this way, by connecting a reversely wound shielded receiving coil in series with the main receiving coil, the direct coupling signals of the main receiving coil and the shielded receiving coil are equal in magnitude and opposite in direction, and are connected in series to cancel each other out. The ratio of the secondary induction signal in the shielded receiving coil to the main receiving coil, that is, the useful signal related to the formation, is:

[0095]

[0096] That is, by sacrificing the β' of the useful signal of the main receiving coil 2 , completely eliminating the direct-coupled signal. Obviously, β' 2 Characterizes the degree of cancellation of useful signals by the shielding coil. β' 2 If it is too large, the useful signal will be lost too much while the direct-coupled signal is eliminated, resulting in a low signal-to-noise ratio of the instrument. 2It is also not appropriate to obtain too small a value. On the one hand, the source distance difference between the shielded receiving coil and the main receiving coil will be too large, resulting in a large difference between the shielded receiving coil of the sub-array and the detection range of the main receiving coil, which will deteriorate the detection performance of the sub-array. On the other hand, too small a value of β' 2 This will make the shielding coil overly sensitive to changes in source distance, which is not conducive to the subsequent direct-coupled balance adjustment of the actual instrument.

[0097] In practice, the design makes β' 2 ≈0.5 is appropriate. Generally, 0.5≤β' 2 ≤0.618. Considering that the short subarray has a shallower detection area, the area near the wellbore has a more dramatic change in the conductivity of the surrounding medium due to the presence of drilling fluid and intrusion. In order to make the shielded receiving coil and the main receiving coil detect the same area as much as possible, the source distance between the shielded receiving coil of the short subarray and the main receiving coil should be relatively close. At the same time, the signal magnitude of the short subarray is relatively large, which also allows the short subarray to tolerate a larger β' 2 value.

[0098] Step S110, performing spatial accommodation analysis on the number of common transmitting coil turns of each three-coil system sub-array, the main receiving coil source distance, the main receiving coil turns and the shielding receiving coil balanced source distance, and the corrected shielding receiving coil turns to obtain analysis results.

[0099] In an optional embodiment, a spatial accommodation analysis is performed on the number of turns of the shared transmitting coil, the main receiving coil source distance, the number of turns of the main receiving coil, the shielding receiving coil balanced source distance, and the corrected number of turns of the shielding receiving coil of each three-coil system subarray to obtain an analysis result, including: determining the coil length of each three-coil system subarray in the array sensing instrument according to the main receiving coil source distance, the number of turns of the main receiving coil, the corrected number of turns of the shielding receiving coil, the shielding receiving coil balanced source distance, and the number of turns of the transmitting coil of each three-coil system subarray; judging whether the structure and assembly relationship design of each three-coil system subarray in the array sensing instrument is reasonable according to the coil length of each three-coil system subarray, and obtaining an analysis result.

[0100] Optionally, after obtaining the shielded receiving coil balanced source distance, it is also necessary to perform a containment check on multiple first coil system subarrays, specifically: calculate the length of each three-coil subarray according to the number of turns, turn spacing of the shared transmitting coil, the number of turns, turn spacing of the shielded receiving coil, and the number of turns, turn spacing of the main receiving coil, and consider the reserved position of the terminal and the plug gauge, etc., analyze the rationality of the actual assembly relationship of the designed coil system structure, and if the assembly is reasonable (i.e., meets the preset assembly conditions), calculate the signal level of the three-coil system subarray, evaluate the signal-to-noise ratio, analyze and evaluate the instrument accuracy and measurement dynamic range, and examine the detection performance, balance and other indicators of the three-coil system subarray. If the detection performance, balance and other indicators are passed, the coil system balance design of the array sensing instrument is completed.

[0101] Step S112, when the analysis result indicates that the structure and assembly relationship of each three-coil system sub-array in the array sensing instrument are reasonably designed, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns of each three-coil system sub-array.

[0102] Optionally, if the structure and assembly relationship of each three-coil system sub-array in the array sensing instrument are reasonably designed, the main receiving coil source distance, the number of main receiving coil turns, the corrected number of shielding receiving coil turns, the shielding receiving coil balanced source distance and the number of transmitting coil turns of each three-coil system sub-array obtained above are used as the coil system generation result. The coil system generation result is as follows: Fig. 9 shown.

[0103] In an optional embodiment, the method further includes: when the analysis results indicate that the structure and assembly relationship design of each coil in the array sensing instrument is unreasonable, iteratively optimizing the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns until the optimized structure and assembly relationship design of each coil in the array sensing instrument is reasonable.

[0104] Optionally, when the structure and assembly relationship of each coil in the array sensing instrument is not reasonably designed, it is necessary to further iteratively optimize the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns. When the structure and assembly relationship of each coil after optimization are reasonably designed, the coil system generation result is performed, thereby improving the rationality and applicability of the coil system of the array sensing instrument.

[0105] Through the above steps S102 to S112, the direct coupling balance of the array induction instrument coil system design can be achieved. At the same time, the balance in the sense of design not only includes the direct coupling balance, but also includes the balance between detection depth and resolution, the balance between signal-to-noise ratio and dynamic measurement range, and the comprehensive balance and optimization of power consumption, instrument length, frequency selection and current distribution.

[0106] Based on the above embodiments and optional embodiments, the present invention proposes an optional implementation mode: Fig.10 is a flow chart of an optional array sensing instrument according to an embodiment of the present invention, such as Fig.10 As shown, the method includes: a direct-coupled balanced design process of a three-coil inductive subarray, and the direct-coupled balanced design process of the three-coil inductive subarray specifically includes the following steps:

[0107] Step S1, determining the number of turns of a common transmitting coil of a plurality of three-coil sub-arrays in an array sensing instrument;

[0108] Step S2, determining the main receiving coil source distance of each initial coil system subarray in the array sensing instrument according to the detection performance requirements such as radial detection depth and longitudinal resolution;

[0109] Step S3, determining the number of turns of the main receiving coil of each coil system sub-array according to the induced signal strength of each three-coil system sub-array and the signal-to-noise ratio of the original collected signal and other indicators;

[0110] Step S4, determining the first ratio β of each three-coil system sub-array, and calculating the initial source distance of the shielded receiving coil of each three-coil system sub-array according to the β value, L b =βL m , and then calculate the number of balanced turns of the shielded receiving coil according to the direct coupling balance formula (3)

[0111] Step S5, adjusting the number of turns of the shielded receiving coil to an integer or an even number, and obtaining a corrected number of turns N' of the shielded receiving coil Nb = int(β 3 N Rm ), and then use formula (13) to calculate the new β' (i.e., the second ratio), and then readjust the source distance of the shielded receiving coil according to the new β' value to obtain the shielded receiving coil balanced source distance L b =β'L m ;

[0112] Step S6, structural accommodation check: calculate the coil length according to the number of turns of the shared transmitting coil, the number of turns of the shielded receiving coil and the number of turns of the main receiving coil, and the turn spacing, and consider the reserved position of the terminal and the plug gauge, etc., and analyze the rationality of the actual assembly relationship of the three-coil system array structure after the source distance correction. If it is reasonable, go to step S7; if it is unreasonable, go to step S2;

[0113] Step S7, calculate the signal level of the three-coil system sub-array, evaluate the signal-to-noise ratio, analyze and evaluate the instrument accuracy and measurement dynamic range, and examine the detection performance, balance and other indicators of the three-coil system sub-array.

[0114] In this embodiment, a device for generating a coil system of an array induction instrument is also provided, and the device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made are not repeated here. As used below, the terms "module" and "device" can implement the combination of software and / or hardware of the predetermined functions. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or the combination of software and hardware, is also possible and conceivable.

[0115] According to an embodiment of the present invention, there is also provided an apparatus embodiment for implementing the above-mentioned method for generating a coil system of an array induction instrument. Fig.11 is a schematic structural diagram of a coil system generating device for an array induction instrument according to an embodiment of the present invention. Fig.11 As shown, the array induction instrument coil system generating device comprises: a first determination module 200, a second determination module 202, a third determination module 204, a fourth determination module 206, an analysis module 208, and an acquisition module 210, wherein:

[0116] The first determination module 200 is used to determine the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of an array sensing instrument; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes a common transmitting coil, a main receiving coil and a shielded receiving coil;

[0117] The second determination module 202 is connected to the first determination module 200 and is used to determine the main receiving coil source distance and the number of main receiving coil turns of each three-coil system sub-array in the plurality of three-coil system sub-arrays; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil;

[0118] The third determination module 204 is connected to the second determination module 202, and is used to determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; and the theoretical balanced number of turns of the shielded receiving coil is the theoretical calculated number of turns that satisfies the direct coupling balance formula;

[0119] The fourth determination module 206 is connected to the third determination module 204, and is used to determine the shielded receiving coil balanced source distance of each three-coil system sub-array based on the main receiving coil source distance, the number of turns of the main receiving coil and the corrected number of turns of the shielded receiving coil of each three-coil system sub-array; wherein the corrected number of turns of the shielded receiving coil is corrected based on the theoretical balanced number of turns of the shielded receiving coil, and the corrected number of turns of the shielded receiving coil is an integer or an even number; the shielded receiving coil balanced source distance is a theoretical calculated source distance that satisfies the direct coupling balance formula;

[0120] The analysis module 208 is connected to the fourth determination module 206 and is used to perform spatial accommodation analysis on the number of common transmitting coil turns, the main receiving coil source distance, the number of main receiving coil turns, the shielding receiving coil balanced source distance, and the corrected number of shielding receiving coil turns of each three-coil system sub-array to obtain an analysis result;

[0121] The acquisition module 210 is connected to the analysis module 208 and is used to obtain the coil system generation result of the array sensing instrument according to the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns of each three-coil system subarray when the analysis result indicates that the structure and assembly relationship of each three-coil system subarray in the array sensing instrument are reasonably designed.

[0122] In the embodiment of the present invention, a first determining module 200 is provided to determine the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of an array sensing instrument; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes a common transmitting coil, a main receiving coil and a shielded receiving coil; a second determining module 202 is connected to the first determining module 200, and is used to determine the number of turns of the main receiving coil of each three-coil system sub-array in the plurality of three-coil system sub-arrays. The receiving coil source distance and the number of turns of the main receiving coil; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; the third determining module 204 is connected to the second determining module 202, and is used to determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; the theoretical balanced number of turns of the shielded receiving coil is the theoretical calculated number of turns that satisfies the direct coupling balance formula; the fourth determining module 206 is connected to the third determining module 204, and is used to determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array The main receiving coil source distance, the number of turns of the main receiving coil and the corrected number of turns of the shielding receiving coil of each three-coil system sub-array are used to determine the shielding receiving coil balanced source distance of each three-coil system sub-array; wherein the corrected number of turns of the shielding receiving coil is corrected based on the theoretical balanced turns of the shielding receiving coil, and the corrected number of turns of the shielding receiving coil is an integer or an even number; the shielding receiving coil balanced source distance is the theoretical calculated source distance that satisfies the direct coupling balance formula; the analysis module 208 is connected to the fourth determination module 206, and is used to analyze the common transmitting coil turns of each three-coil system sub-array, the main receiving coil source distance, the main receiving coil turns and the shielding receiving coil balanced source distance, the corrected shielding receiving coil turns, and the shielding receiving coil balanced source distance. The acquisition module 210 is connected to the analysis module 208 and is used to obtain the coil system generation result of the array sensing instrument according to the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns of each three-coil system subarray when the analysis result indicates that the structure and assembly relationship design of each three-coil system subarray in the array sensing instrument is reasonable, thereby solving the technical problem in the related art that the factors considered in the optimization design of the array sensing instrument coil system are not comprehensive, resulting in unreasonable design and generation of the array sensing instrument coil system and poor instrument applicability.

[0123] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0124] It should be noted that the first determination module 200, the second determination module 202, the third determination module 204, the fourth determination module 206, the analysis module 208, and the acquisition module 210 correspond to steps S102 to S112 in the embodiment, and the examples and application scenarios implemented by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the modules as part of the device can be run in a computer terminal.

[0125] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in the embodiment, which will not be repeated here.

[0126] The array induction instrument coil system generating device may further include a processor and a memory. The first determination module 200, the second determination module 202, the third determination module 204, the fourth determination module 206, the analysis module 208, the acquisition module 210, etc. are all stored in the memory as program modules, and the processor executes the program modules stored in the memory to implement corresponding functions.

[0127] The processor includes a kernel, which retrieves the corresponding program module from the memory. The kernel may be one or more. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. The memory includes at least one memory chip.

[0128] According to an embodiment of the present application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute any of the above array induction instrument coil system generation methods.

[0129] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group, and the non-volatile storage medium includes a stored program.

[0130] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: determine the number of turns of a common transmitting coil of multiple three-coil sub-arrays of an array sensing instrument; wherein the multiple three-coil sub-arrays include a common transmitting coil and multiple pairs of receiving coils, the multiple pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil sub-array includes a common transmitting coil, a main receiving coil and a shielded receiving coil; for each three-coil sub-array in the multiple three-coil sub-arrays, determine the main receiving coil source distance and the number of main receiving coil turns of each three-coil sub-array; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; based on the main receiving coil source distance and the number of main receiving coil turns of each three-coil sub-array, determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; the theoretical balanced number of turns of the shielded receiving coil The number of turns is the theoretical calculated number of turns that satisfies the direct coupling balance formula; based on the main receiving coil source distance, the number of main receiving coil turns and the corrected number of shielding receiving coil turns of each three-coil system subarray, the shielding receiving coil balanced source distance of each three-coil system subarray is determined; wherein the corrected number of shielding receiving coil turns is corrected based on the theoretical balanced turns of the shielding receiving coil, and the corrected number of shielding receiving coil turns is an integer or an even number; the shielding receiving coil balanced source distance is the theoretical calculated source distance that satisfies the direct coupling balance formula; the number of turns of the common transmitting coil, the main receiving coil source distance, the number of main receiving coil turns, the shielding receiving coil balanced source distance and the corrected number of shielding receiving coil turns of each three-coil system subarray are subjected to spatial accommodation analysis to obtain analysis results; when the analysis results indicate that the structure and assembly relationship design of each three-coil system subarray in the array sensing instrument is reasonable, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the main receiving coil turns, the corrected number of shielding receiving coil turns, the shielding receiving coil balanced source distance and the number of transmitting coil turns of each three-coil system subarray.

[0131] According to an embodiment of the present application, an embodiment of a processor is also provided. Optionally, in this embodiment, the processor is used to run a program, wherein when the program is run, any of the above-mentioned array induction instrument coil system generation methods is executed.

[0132] According to an embodiment of the present application, an embodiment of a computer program product is also provided. When executed on a data processing device, the computer program product is suitable for executing a program that initializes any of the above-mentioned steps of the method for generating a coil system of an array induction instrument.

[0133] Optionally, the above-mentioned computer program product, when executed on a data processing device, is suitable for executing a program for initializing the following method steps: determining the number of turns of a common transmitting coil of a plurality of three-coil system subarrays of an array sensing instrument; wherein the plurality of three-coil system subarrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielding receiving coil, the main receiving coil and the shielding receiving coil are wound in opposite directions, and a three-coil system subarray includes a common transmitting coil, a main receiving coil and a shielding receiving coil; for each of the plurality of three-coil system subarrays, determining the main receiving coil source distance and the number of main receiving coil turns of each three-coil system subarray; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; based on the main receiving coil source distance and the number of main receiving coil turns of each three-coil system subarray, determining the initial source distance of the shielding receiving coil and the theoretical balanced number of turns of the shielding receiving coil of each three-coil system subarray; wherein the initial source distance of the shielding receiving coil is the distance between the center of the transmitting coil and the center of the shielding receiving coil; shielding connection The theoretical balanced turns of the receiving coil are the theoretical calculated turns that meet the direct coupling balance formula; based on the main receiving coil source distance, the main receiving coil turns and the corrected shielding receiving coil turns of each three-coil system subarray, the shielding receiving coil balanced source distance of each three-coil system subarray is determined; wherein the corrected shielding receiving coil turns are corrected based on the theoretical balanced turns of the shielding receiving coil, and the corrected shielding receiving coil turns are an integer or an even number; the shielding receiving coil balanced source distance is the theoretical calculated source distance that meets the direct coupling balance formula; the common transmitting coil turns, the main receiving coil source distance, the main receiving coil turns, the shielding receiving coil balanced source distance and the corrected shielding receiving coil turns of each three-coil system subarray are subjected to spatial accommodation analysis to obtain analysis results; when the analysis results indicate that the structure and assembly relationship of each three-coil system subarray in the array sensing instrument are reasonably designed, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the main receiving coil turns, the corrected shielding receiving coil turns, the shielding receiving coil balanced source distance and the transmitting coil turns of each three-coil system subarray.

[0134] An embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: determining the number of turns of a common transmitting coil of multiple three-coil sub-arrays of an array induction instrument; wherein the multiple three-coil sub-arrays include a common transmitting coil and multiple pairs of receiving coils, the multiple pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil sub-array includes a common transmitting coil, a main receiving coil and a shielded receiving coil; for each three-coil sub-array in the multiple three-coil sub-arrays, determining the main receiving coil source distance and the number of main receiving coil turns of each three-coil sub-array; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; based on the main receiving coil source distance and the number of main receiving coil turns of each three-coil sub-array, determining the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the shielded receiving coil The distance between the centers; the theoretical balanced turns of the shielded receiving coil is the theoretical calculated turns that meets the direct coupling balance formula; based on the main receiving coil source distance, the main receiving coil turns and the corrected shielded receiving coil turns of each three-coil system subarray, the shielded receiving coil balanced source distance of each three-coil system subarray is determined; wherein the corrected shielded receiving coil turns are corrected based on the theoretical balanced turns of the shielded receiving coil, and the corrected shielded receiving coil turns are integers or even numbers; the shielded receiving coil balanced source distance is the theoretical calculated source distance that meets the direct coupling balance formula; the common transmitting coil turns of each three-coil system subarray, the main receiving coil source distance, the main receiving coil turns, the shielded receiving coil balanced source distance, and the corrected shielded receiving coil turns are analyzed for spatial accommodation to obtain analysis results; when the analysis results indicate that the structure and assembly relationship of each three-coil system subarray in the array sensing instrument are reasonably designed, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the main receiving coil turns, the corrected shielded receiving coil turns, the shielded receiving coil balanced source distance and the transmitting coil turns of each three-coil system subarray.

[0135] The above sequence of the embodiments of the present invention is for description only and does not represent the superiority or inferiority of the embodiments.

[0136] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0137] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the above modules can be a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, modules or indirect coupling or communication connection of modules, which can be electrical or other forms.

[0138] The modules described above as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0139] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0140] If the above-mentioned integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a non-volatile storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The aforementioned non-volatile storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0141] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for generating a coil system of an array induction instrument, characterized in that: include: Determine the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of an array sensing instrument; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes the common transmitting coil, a main receiving coil and a shielded receiving coil; For each of the three-coil system sub-arrays in the plurality of three-coil system sub-arrays, determining a main receiving coil source distance and a number of main receiving coil turns of each of the three-coil system sub-arrays; wherein the main receiving coil source distance is the distance between the center of the transmitting coil and the center of the main receiving coil; Based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array, determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; the theoretical balanced number of turns of the shielded receiving coil is the theoretical calculated number of turns that satisfies the direct coupling balance formula; Based on the main receiving coil source distance, the number of turns of the main receiving coil and the corrected number of turns of the shielding receiving coil of each three-coil system sub-array, the shielding receiving coil balanced source distance of each three-coil system sub-array is determined; wherein the corrected number of turns of the shielding receiving coil is corrected based on the theoretical balanced number of turns of the shielding receiving coil, and the corrected number of turns of the shielding receiving coil is an integer or an even number; the shielding receiving coil balanced source distance is a theoretical calculated source distance that satisfies the direct coupling balance formula; Performing a spatial accommodation analysis on the number of turns of the common transmitting coil of each three-coil system sub-array, the source distance of the main receiving coil, the number of turns of the main receiving coil, the balanced source distance of the shielding receiving coil, and the corrected number of turns of the shielding receiving coil to obtain an analysis result; When the analysis result indicates that the structure and assembly relationship of each three-coil system sub-array in the array sensing instrument are reasonably designed, the coil system generation result of the array sensing instrument is obtained according to the main receiving coil source distance, the number of main receiving coil turns, the corrected number of shielding receiving coil turns, the shielding receiving coil balanced source distance and the number of transmitting coil turns of each three-coil system sub-array.

2. The method according to claim 1, characterized in that The method further comprises: When the analysis result indicates that the structure and assembly relationship of each coil in the array sensing instrument are not reasonably designed, the main receiving coil source distance, the number of turns of the main receiving coil, the corrected number of turns of the shielded receiving coil, the shielded receiving coil balanced source distance and the number of turns of the transmitting coil are iteratively optimized until the optimized structure and assembly relationship of each coil in the array sensing instrument are reasonably designed.

3. The method according to claim 1, characterized in that The determining, based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array, the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array comprises: Determining a first ratio corresponding to each of the three-coil system sub-arrays based on the main receiving coil source distance of each of the three-coil system sub-arrays; Determine the initial source distance of the shielding receiving coil based on the first ratio of each three-coil system sub-array and the main receiving coil source distance; The theoretical balanced number of turns of the shielding receiving coil of each three-coil system sub-array is determined based on the main receiving coil source distance, the number of turns of the main receiving coil and the initial source distance of the shielding receiving coil of each three-coil system sub-array.

4. The method according to claim 1, characterized in that: The determining of the shielding receiving coil balanced source distance of each three-coil system subarray based on the main receiving coil source distance of each three-coil system subarray, the number of turns of the main receiving coil and the corrected number of turns of the shielding receiving coil comprises: Determine a second ratio of each three-coil system subarray based on the number of turns of the main receiving coil and the corrected number of turns of the shielding receiving coil of each three-coil system subarray; The shielding receiving coil balanced source distance of each three-coil system sub-array is determined based on the second ratio of each three-coil system sub-array, the main receiving coil source distance, the number of turns of the main receiving coil, and the corrected number of turns of the shielding receiving coil.

5. The method according to claim 1, characterized in that The spatial accommodation analysis is performed on the number of turns of the common transmitting coil of each three-coil system sub-array, the source distance of the main receiving coil, the number of turns of the main receiving coil and the balanced source distance of the shielding receiving coil, and the corrected number of turns of the shielding receiving coil to obtain the analysis result, including: Determine the coil length of each three-coil subarray in the array sensing instrument according to the main receiving coil source distance, the number of turns of the main receiving coil, the corrected number of turns of the shielding receiving coil, the shielding receiving coil balanced source distance and the number of turns of the transmitting coil of each three-coil subarray; According to the coil length of each three-coil sub-array, it is judged whether the structure and assembly relationship design of each three-coil sub-array in the array sensing instrument is reasonable to obtain the analysis result.

6. The method according to claim 1, characterized in that Determining the main receiving coil source distance of each three-coil system sub-array comprises: Determine the radial depth measurement and longitudinal resolution corresponding to each three-coil system sub-array; The main receiving coil source distance of each three-coil system sub-array is determined based on the radial depth measurement and the longitudinal resolution of each three-coil system sub-array.

7. The method according to any one of claims 1 to 6, characterized in that: The method of determining the number of turns of a common transmitting coil and the number of turns of a main receiving coil of a plurality of three-coil sub-arrays of an array sensing instrument comprises: Determine the induced signal strength and the original signal-to-noise ratio of each three-coil system sub-array; The number of turns of the common transmitting coil is determined based on the induced signal strength and the original signal-to-noise ratio of each three-coil sub-array.

8. A coil generation device for an array induction instrument, characterized in that: include: A first determination module is used to determine the number of turns of a common transmitting coil of a plurality of three-coil system sub-arrays of an array sensing instrument; wherein the plurality of three-coil system sub-arrays include a common transmitting coil and a plurality of pairs of receiving coils, the plurality of pairs of receiving coils respectively include a main receiving coil and a shielded receiving coil, the main receiving coil and the shielded receiving coil are wound in opposite directions, and a three-coil system sub-array includes the common transmitting coil, a main receiving coil and a shielded receiving coil; A second determination module is used to determine, for each three-coil system sub-array in the plurality of three-coil system sub-arrays, a main receiving coil source distance and a number of main receiving coil turns of each three-coil system sub-array; wherein the main receiving coil source distance is a distance between a center of a transmitting coil and a center of a main receiving coil; A third determination module is used to determine the initial source distance of the shielded receiving coil and the theoretical balanced number of turns of the shielded receiving coil of each three-coil system sub-array based on the main receiving coil source distance and the number of turns of the main receiving coil of each three-coil system sub-array; wherein the initial source distance of the shielded receiving coil is the distance between the center of the transmitting coil and the center of the shielded receiving coil; and the theoretical balanced number of turns of the shielded receiving coil is the theoretical calculated number of turns that satisfies the direct coupling balance formula; The fourth determination module is used to determine the shielded receiving coil balanced source distance of each three-coil system sub-array based on the main receiving coil source distance, the main receiving coil turns and the corrected shielded receiving coil turns of each three-coil system sub-array; wherein the corrected shielded receiving coil turns are corrected based on the theoretical balanced turns of the shielded receiving coil, and the corrected shielded receiving coil turns are an integer or an even number; the shielded receiving coil balanced source distance is a theoretical calculated source distance that satisfies the direct coupling balance formula; An analysis module is used to perform spatial accommodation analysis on the number of turns of the common transmitting coil of each three-coil system sub-array, the source distance of the main receiving coil, the number of turns of the main receiving coil and the balanced source distance of the shielding receiving coil, and the corrected number of turns of the shielding receiving coil to obtain an analysis result; an acquisition module, configured to obtain a coil system generation result of the array sensing instrument according to the main receiving coil source distance, the number of main receiving coil turns, the corrected number of shielding receiving coil turns, the shielding receiving coil balanced source distance and the number of transmitting coil turns of each three-coil system subarray, when the analysis result indicates that the structure and assembly relationship of each three-coil system subarray in the array sensing instrument are reasonably designed.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executed by the coil system generation method for an array induction instrument according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The invention comprises one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the array induction instrument coil system generation method according to any one of claims 1 to 7.

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