Well logging acoustic receiving device

Abstract

The invention provides a logging acoustic receiving device, and relates to the technical field of petroleum geophysical exploration logging, the receiving device comprises a plurality of acoustic receiving units connected in sequence, and each acoustic receiving unit comprises a plurality of acoustic energy receiving crystals installed in different directions and a signal processing circuit. The receiving device adopts an oil balance design, and the sound energy receiving crystal and the signal processing circuit are both immersed in silicone oil in a capsule of the receiving device, so that the problem of pressure balance between the sound energy receiving crystal and borehole slurry can be solved, the heat dissipation of the circuit is facilitated, the operation stability and reliability of the receiving device are improved, and meanwhile, the service life of the receiving device is prolonged. The structural design complexity of the acoustic receiving device is greatly simplified, and the device is convenient to maintain.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum geophysical exploration and well logging, and is applied to an array acoustic wave signal receiving device, in particular to a well logging acoustic receiving device. Background Art

[0002] In the prior art, the cross-dipole array acoustic wave instrument can perform monopole longitudinal wave measurement and dipole shear wave measurement, and can detect the anisotropy of shear wave velocity. In addition to being used for formation sound velocity time difference extraction, the measurement results can also be used for formation evaluation, shear wave anisotropy measurement, and judgment of fracture development.

[0003] However, the acoustic receiving device of the current cross-dipole array acoustic logging instrument has low reliability because its acoustic energy receiving crystal adopts a special manufacturing and installation process, which is easy to be damaged and fail in a complex wellbore environment. At the same time, the acoustic energy receiving crystal is far away from the corresponding signal processing circuit, which reduces the signal-to-noise ratio of the effective acoustic wave signal, thereby affecting the quality of the measurement curve.

[0004] In view of the problems in the prior art, the present invention provides a well logging acoustic receiving device. Summary of the invention

[0005] In view of the problems of the current prior art, the present invention provides a well logging acoustic receiving device, which comprises a plurality of acoustic receiving units connected in sequence, each of which comprises a plurality of acoustic energy receiving crystals installed in different directions and a signal processing circuit.

[0006] According to one embodiment of the present invention, the receiving device comprises eight acoustic receiving units connected in sequence, each of the acoustic receiving units is provided with a central circular through hole in the axial direction, and flexible sound insulation rubber is installed between adjacent acoustic receiving units.

[0007] According to an embodiment of the present invention, all the acoustic receiving units in the receiving device are immersed in the silicone oil inside the capsule of the receiving device.

[0008] According to an embodiment of the present invention, each of the acoustic receiving units comprises four acoustic energy receiving crystals installed at the same depth point, wherein the four acoustic energy receiving crystals receive acoustic waveforms in four different directions.

[0009] According to an embodiment of the present invention, the four sound energy receiving crystals and the one signal processing circuit included in each of the acoustic receiving units are installed in an integrated manner.

[0010] According to an embodiment of the present invention, in each of the acoustic receiving units, the signal processing circuit is installed on one side end face of the acoustic energy receiving crystal fixing frame and is in the shape of a circular opening.

[0011] According to an embodiment of the present invention, in each of the acoustic receiving units, the leads of the acoustic energy receiving crystal are connected to the signal processing circuit via a wire hole.

[0012] According to one embodiment of the present invention, in each of the acoustic receiving units, the acoustic energy receiving crystal converts the received acoustic waveform into a differential electrical signal, and outputs it to the signal processing circuit. The signal processing circuit converts the differential signal to a single-ended signal, amplifies the primary signal, and then filters out the power frequency and high-frequency noise through a bandpass filter circuit, and finally outputs it to the signal measurement circuit board of the main line of the logging instrument for digital conversion.

[0013] According to another aspect of the present invention, there is also provided a well logging acoustic receiving method, which is performed by a receiving device as described in any one of the above items, wherein the receiving device comprises a plurality of acoustic receiving units connected in sequence, each of the acoustic receiving units comprises a plurality of acoustic energy receiving crystals installed in different directions and a signal processing circuit, and the method comprises:

[0014] In each of the acoustic receiving units, the received acoustic waveform is converted into a differential electrical signal by the acoustic energy receiving crystal and output to the signal processing circuit;

[0015] The signal processing circuit is used to convert the differential signal into a single-ended signal and amplify the primary signal, and then the power frequency and high-frequency noise are filtered out by the bandpass filter circuit, and finally the signal is output to the signal measurement circuit board of the main circuit of the logging instrument for digital conversion.

[0016] According to another aspect of the present invention, a storage medium is provided, which contains a series of instructions for executing the method steps described above.

[0017] The present invention provides a well logging acoustic receiving device, which has the following advantages compared with the prior art:

[0018] 1) In the present invention, the receiving device adopts an oil balance design, and the acoustic energy receiving crystal and the signal processing circuit are immersed in the silicone oil inside the capsule of the receiving device. This design can not only solve the pressure balance problem between the acoustic energy receiving crystal and the wellbore mud, but also facilitate circuit heat dissipation, improve the stability and reliability of the receiving device operation, and at the same time, greatly simplify the structural design complexity of the acoustic receiving device, making it easier to maintain the device.

[0019] 2) In the present invention, the signal processing circuit and the acoustic energy receiving crystal are installed in an integrated manner. The acoustic energy receiving crystals in four directions at the same depth point and a signal processing circuit constitute a group of acoustic receiving units. This design minimizes the distance between the acoustic energy receiving crystal and the signal processing circuit, thereby improving the signal-to-noise ratio of the acoustic signal measurement.

[0020] 3) In the present invention, flexible sound insulation rubber is installed between adjacent acoustic receiving units to reduce the mutual crosstalk of sound wave signals between the acoustic receiving units and enhance the sound insulation effect of the receiving device on direct sound waves.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A schematic structural diagram of an acoustic receiving unit according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic structural diagram of a well logging acoustic receiving device according to an embodiment of the present invention is shown;

[0025] Figure 3 A diagram showing a signal processing process of an acoustic receiving unit according to an embodiment of the present invention is shown;

[0026] Figure 4 A waveform diagram of monopole 8-channel acoustic wave measurement according to an embodiment of the present invention is shown.

[0027] In the accompanying drawings, the same reference numerals are used for the same components. In addition, the accompanying drawings are not drawn according to the actual scale.

[0028] The meanings of the various figure marks in the accompanying drawings are as follows: 1-first acoustic receiving unit; 2-second acoustic receiving unit; 3-third acoustic receiving unit, 4-fourth acoustic receiving unit; 5-fifth acoustic receiving unit; 6-sixth acoustic receiving unit; 7-seventh acoustic receiving unit; 8-eighth acoustic receiving unit; 11-acoustic energy receiving crystal; 12-signal processing circuit; 13-central circular through hole; 14-opening of the signal processing circuit; 15-wire hole. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0030] Common cross-dipole array acoustic logging instruments (such as XMACⅡ) are composed of two monopole transmitters (near monopole and far monopole), two orthogonally arranged dipole transmitters and eight array receivers. They can not only collect full-wave monopole wave trains and dipole wave trains (Inline mode), but also cross-dipole wave trains (Crossline mode).

[0031] In the prior art, the cross-dipole array acoustic wave instrument can perform monopole longitudinal wave measurement and dipole shear wave measurement, and can detect the anisotropy of shear wave velocity. In addition to being used for formation sound velocity time difference extraction, the measurement results can also be used for formation evaluation, shear wave anisotropy measurement, and judgment of fracture development.

[0032] The existing technology (Sun Baolong, Xiao Leilei, Wan Wenyu. Test scheme and application of cross-dipole array acoustic emission acoustic logging instrument [J]. Petrochemical Technology, 2021, 28 (07): 61-62.) mentioned that the cross-dipole array acoustic logging instrument is a logging method that analyzes and studies reservoir characteristics by measuring the acoustic propagation characteristics of the formation. After a series of repairs such as single dipole probe detection, replacement of the bladder, welding of the probe line and the transformer line, in order to verify its functionality, daily inspections are performed to connect the ground system to the communicator, receiving acoustic system, transmitting acoustic system, and transmitting control electronic circuit test, which is time-consuming, labor-intensive, and labor-intensive. A scheme was analyzed and designed for testing, and the working principles and test procedures of each part were given. The application in actual work proved the feasibility and convenience of the design.

[0033] Existing technology (Gao Chongfei, Miao Bei. Research on the application of cross-dipole array acoustic logging in open hole wells [J]. Energy and Environmental Protection, 2023, 45(03): 68-74. DOI: 10.19389 / j.cnki.1003-0506.2023.03.012.) In order to ensure that the signal attenuation trend is slowed down while further enriching the types and sources of acoustic wave data, the cross-dipole array acoustic wave logging technology is applied to the data acquisition process of the mine, and the application of the cross-dipole array acoustic wave logging technology in the open hole well is studied. A mine was selected as the experimental research area, and the acoustic wave receiving and transmitting device was installed. The acoustic wave recognition process was designed, and the array acoustic wave was extracted and processed by combining the longitudinal wave, the shear wave, and the Stoneley wave. The mechanical properties of the rock were analyzed using the cross-dipole array acoustic wave logging technology, and the statistical histograms of the four rock mechanical parameters of Poisson's ratio, Young's modulus, shear modulus, and bulk modulus were obtained. By analyzing the anisotropy of different strata, the main receiving directions of sound waves in five coal seam structures were obtained. The results of the formation waveform amplitude and attenuation trend analysis were obtained, and the direction of the low-altitude permeability layer was obtained based on the reflection coefficients of different waveforms.

[0034] Existing technology (Liu Xien, Qiu Ao, Wang Wenliang, etc. Design of analog channel circuit for cross-dipole array acoustic logging instrument [J]. Electronic Quality, 2011 (01): 62-65+73.) Aiming at the high temperature and strong background noise operating environment of cross-dipole array acoustic logging instrument, the cross-dipole pre-analog channel circuit is designed by using analog filtering, low noise design and optimized layout and wiring technology to realize the functions of acoustic signal reception, waveform mode selection, programmable gain amplification, active bandpass filtering, etc. This paper elaborates in detail how to suppress high-frequency noise interference and reduce the noise influence of the circuit itself, focusing on the analysis and introduction of the design of low-noise pre-amplifier circuit and active bandpass filter. The experimental results show that the analog circuit has low noise, strong noise suppression ability, good waveform consistency between channels, and can work stably and reliably in the harsh environment of the well.

[0035] Existing technology (Zhang Yong, Cai Zhiming, Zhang Xionghui, et al. Design and application of through-drill pipe storage cross-dipole array acoustic logging instrument [J]. Logging Technology, 2019, 43(05).) mentioned that China's storage acoustic logging instruments mostly use monopole technology, mainly providing parameters such as formation porosity for reservoir evaluation. In the measurement of soft formations, the instrument cannot extract shear wave signals and the measurement accuracy is not high. The application scope of this type of instrument is limited to a single isotropic formation, and the application effect is poor for complex and variable anisotropic formations. A through-drill pipe storage cross-dipole array acoustic logging instrument with an outer diameter of 60 mm was developed, including hardware circuit design, software design, and data compression algorithm design, and the emission control frequency of small-diameter monopole, dipole and Stoneley wave transmitting transducers was determined through experiments. Field logging data show that the instrument can measure formation longitudinal waves, shear waves and Stoneley waves, identify the size and orientation of formation anisotropy, and can be used for through-drill-pipe storage logging operations in complex horizontal wells such as shale gas wells.

[0036] Existing technology (Chen Lei, Shi Yibing, Zhang Wei, etc. Design and implementation of control and processing circuit of cross-dipole array acoustic logging instrument [J]. Measurement and Control Technology, 2010, 29(01): 47-50. DOI: 10.19708 / j.ckjs.2010.01.015.) According to the characteristics of cross-dipole array acoustic logging signals, a control and processing circuit with "DSP+FPGA" architecture as the core is designed. The hardware structure and software design process of the circuit are introduced in detail, and the implementation of the logging data communication interface and the logic control module are described in detail, and a first wave extraction algorithm is given. The experimental results show that the circuit can work stably and reliably for a long time in the harsh environment of high temperature and high pressure underground, which fully meets the needs of industrial production operations.

[0037] Existing technology (Qian Xiaoming, Shi Yibing, Zhang Wei, etc. Anti-interference design of signal processing circuit of cross-dipole array acoustic logging instrument [J]. Measurement and Control Technology, 2010, 29(04): 27-30+34. DOI: 10.19708 / j.ckjs.2010.04.008.) Aiming at the high temperature and strong background noise working environment of cross-dipole array acoustic logging instrument, the cross-dipole acoustic signal processing circuit is designed by in-depth analysis of noise sources, signal filtering and optimized layout wiring. The anti-interference design of functional modules such as pre-amplifier circuit, high-precision bandpass filter and logic control in harsh environment is emphasized. The experimental results show that the processing circuit can work stably and reliably in the harsh environment of underground well, has strong noise suppression ability, and fully meets the needs of industrial production operations.

[0038] However, the acoustic receiving device of the cross-dipole array acoustic logging instrument disclosed in the above-mentioned prior art has low reliability, because its acoustic energy receiving crystal adopts a special manufacturing and installation process, which is easy to be damaged and fail in a complex wellbore environment. At the same time, the acoustic energy receiving crystal is far away from the corresponding signal processing circuit, which reduces the signal-to-noise ratio of the effective acoustic wave signal, thereby affecting the quality of the measurement curve.

[0039] In view of the above-mentioned defects of the prior art, the present invention provides a well logging acoustic receiving device for a cross-dipole array acoustic wave instrument, which can achieve the technical effects of high reliability, high measurement and easy maintenance.

[0040] Figure 1 A schematic structural diagram of an acoustic receiving unit according to an embodiment of the present invention is shown.

[0041] A well logging acoustic receiving device comprises a plurality of acoustic receiving units connected in sequence, each of which comprises a plurality of acoustic energy receiving crystals 11 installed in different directions and a signal processing circuit 12.

[0042] In one embodiment, the receiving device includes eight acoustic receiving units connected in sequence, each acoustic receiving unit is provided with a central circular through hole 13 in the axial direction, and flexible sound insulation rubber is installed between adjacent acoustic receiving units.

[0043] Specifically, installing flexible sound insulation rubber between adjacent acoustic receiving units can reduce the mutual crosstalk of sound wave signals between the acoustic receiving units and enhance the sound insulation effect of the receiving device on direct sound waves.

[0044] like Figure 2 As shown, a single receiving device includes eight acoustic receiving units connected in sequence, namely a first acoustic receiving unit 1, a second acoustic receiving unit 2, a third acoustic receiving unit 3, a fourth acoustic receiving unit 4, a fifth acoustic receiving unit 5, a sixth acoustic receiving unit 6, a seventh acoustic receiving unit 7, and an eighth acoustic receiving unit 8.

[0045] Specifically, the array acoustic wave logging acoustic receiving device includes a total of eight acoustic receiving units, each of which is equipped with four-directional sound energy receiving crystals 11 and a signal processing circuit 12. High sound insulation rubber is installed between adjacent acoustic receiving units. The central circular through hole 13 is used for the wiring of the receiving device. The acoustic receiving units are immersed in the silicone oil inside the capsule of the receiving device.

[0046] In one embodiment, all acoustic receiving units in the receiving device are immersed in the silicone oil inside the capsule of the receiving device. Specifically, the receiving device adopts an oil balance design, and the acoustic energy receiving crystal 11 and the signal processing circuit 12 are immersed in the silicone oil inside the capsule of the receiving device. This design can not only solve the pressure balance problem between the acoustic energy receiving crystal 11 and the wellbore mud, but also facilitate the heat dissipation of the signal processing circuit 12, improve the stability and reliability of the operation of the receiving device, and at the same time, greatly simplify the complexity of the structural design of the acoustic receiving device, and facilitate the maintenance of the device.

[0047] In one embodiment, each acoustic receiving unit includes four acoustic energy receiving crystals 11 installed at the same depth, wherein the four acoustic energy receiving crystals 11 receive acoustic waveforms in four different directions. Specifically, the four acoustic energy receiving crystals 11 are installed in the front, rear, left and right sides of the axial direction of the receiving device, respectively, and can receive acoustic waveforms in four different directions.

[0048] In one embodiment, the four acoustic energy receiving crystals 11 and a signal processing circuit 12 included in each acoustic receiving unit are installed in an integrated manner. Specifically, the signal processing circuit 12 is installed in an integrated manner with the acoustic energy receiving crystal 11, and the acoustic energy receiving crystals 11 in four directions at the same depth point and a signal processing circuit 12 form an acoustic receiving unit. This design can minimize the distance between the acoustic energy receiving crystal 11 and the signal processing circuit 12, and improve the signal-to-noise ratio of the acoustic signal measurement.

[0049] In one embodiment, Figure 1 As shown, in each acoustic receiving unit, the signal processing circuit 12 is installed on one side end face of the acoustic energy receiving crystal fixing frame, and is in the shape of a circular ring opening. Specifically, the signal processing circuit 12 is installed on one side of the acoustic receiving unit, and is a circular ring with a central circular through hole 13 in the axial direction, and the circular ring is provided with a signal processing circuit opening 14.

[0050] In one embodiment, Figure 1 As shown, in each acoustic receiving unit, the lead of the acoustic energy receiving crystal 11 is connected to the signal processing circuit 12 through the wire hole 15. Specifically, the signal processing circuit 12 is installed on one side end surface of the acoustic energy receiving crystal fixing frame, and the lead of the acoustic energy receiving crystal 11 is connected to the signal processing circuit 12 through the wire hole 15. The signal processing circuit 12 is in the shape of a circular ring opening, and the internal cables of the receiving device can pass through the central circular hole 13 and the signal processing circuit opening 14. This design facilitates the installation and replacement of the signal processing circuit 12.

[0051] Figure 3 A diagram showing a signal processing process of an acoustic receiving unit according to an embodiment of the present invention is shown.

[0052] like Figure 3 As shown, in each acoustic receiving unit, the acoustic energy receiving crystal 11 converts the received acoustic waveform into a differential electrical signal, and outputs it to the signal processing circuit 12. The differential signal to single-ended gain amplifier circuit in the signal processing circuit 12 converts the differential signal to a single-ended signal and amplifies the primary signal. The power frequency and high-frequency noise are then filtered out through the filter circuit (100Hz~20KHz) in the signal processing circuit 12, and finally output to the (acoustic) signal measurement circuit board of the main line of the logging instrument for digital conversion.

[0053] The present invention discloses a well logging acoustic receiving device for a cross-dipole array acoustic wave instrument, which includes eight groups of acoustic receiving units, each group of acoustic receiving units is equipped with acoustic energy receiving crystals 11 in four directions and a signal processing circuit 12, and high sound insulation rubber is installed between each group of acoustic receiving units, all of which are immersed in the silicone oil inside the capsule of the receiving device. The receiving device adopts an oil balance design, which greatly simplifies the structural design for easy maintenance and improves the stability and reliability of the receiving device. At the same time, the integrated installation of the signal processing circuit 11 and the acoustic energy receiving crystal 12 effectively improves the signal-to-noise ratio of the acoustic signal measurement, and the flexible sound insulation rubber between each acoustic receiving unit can improve the sound insulation effect of the direct sound wave.

[0054] According to another aspect of the present invention, a well logging acoustic receiving method is also provided, which is performed by a well logging acoustic receiving device. The receiving device includes a plurality of acoustic receiving units connected in sequence, each acoustic receiving unit includes a plurality of acoustic energy receiving crystals 11 installed in different directions and a signal processing circuit 12, and the method includes: in each acoustic receiving unit, the received acoustic waveform is converted into a differential electrical signal by the acoustic energy receiving crystal 11, and output to the signal processing circuit 12; the differential signal is converted into a single-ended signal and the primary signal is amplified by the signal processing circuit 12, and then the power frequency and high-frequency noise are filtered out by the bandpass filter circuit, and finally output to the signal measurement circuit board of the main line of the well logging instrument for digital conversion.

[0055] The present invention provides a well logging acoustic receiving device for a cross-dipole array acoustic wave instrument, which adopts an oil balance design, greatly simplifies the structural design complexity of the acoustic receiving device, facilitates maintenance, and improves the stability and reliability of the operation of the receiving device. At the same time, the integrated installation of the signal processing circuit 12 and the acoustic energy receiving crystal 11 effectively improves the signal-to-noise ratio of the acoustic signal measurement, and the high sound insulation material installed between the acoustic receiving units can improve the sound insulation effect of the direct sound wave.

[0056] The well logging acoustic receiving device provided by the present invention may also be used in conjunction with a computer-readable storage medium, on which a computer program is stored, and the computer program is executed to run a well logging acoustic receiving method. The computer program can run computer instructions, which include computer program codes, which may be in source code form, object code form, executable file, or some intermediate form.

[0057] Computer-readable storage media may include: any entity or device that can carry computer program code, recording media, USB flash drives, mobile hard disks, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0058] It should be noted that the content contained in computer-readable storage media can be appropriately increased or decreased based on the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, based on legislation and patent practices, computer-readable storage media do not include electrical carrier signals and telecommunications signals.

[0059] Figure 4 A waveform diagram of monopole 8-channel acoustic wave measurement according to an embodiment of the present invention is shown.

[0060] like Figure 4 As shown, the waveforms obtained by measuring 8-channel acoustic waves in the downhole monopole mode of the array acoustic wave, the results show that the waveforms measured by the logging acoustic receiving device for the cross-dipole array acoustic wave instrument provided by the present invention have obvious waveform characteristics of longitudinal waves and shear waves, high signal-to-noise ratio, and the waveform quality meets the requirements of data interpretation and processing.

[0061] In summary, the present invention provides a well logging acoustic receiving device, which has the following advantages compared with the prior art:

[0062] 1) In the present invention, the receiving device adopts an oil balance design, and the acoustic energy receiving crystal and the signal processing circuit are immersed in the silicone oil inside the capsule of the receiving device. This design can not only solve the pressure balance problem between the acoustic energy receiving crystal and the wellbore mud, but also facilitate circuit heat dissipation, improve the stability and reliability of the receiving device operation, and at the same time, greatly simplify the structural design complexity of the acoustic receiving device, making it easier to maintain the device.

[0063] 2) In the present invention, the signal processing circuit and the acoustic energy receiving crystal are installed in an integrated manner. The acoustic energy receiving crystals in four directions at the same depth point and a signal processing circuit constitute a group of acoustic receiving units. This design minimizes the distance between the acoustic energy receiving crystal and the signal processing circuit, thereby improving the signal-to-noise ratio of the acoustic signal measurement.

[0064] 3) In the present invention, flexible sound insulation rubber is installed between adjacent acoustic receiving units to reduce the mutual crosstalk of sound wave signals between the acoustic receiving units and enhance the sound insulation effect of the receiving device on direct sound waves.

[0065] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0066] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] Certain terms are used throughout this application document to indicate specific system components. As those skilled in the art will recognize, different names can usually be used to indicate the same components, so this application document is not intended to distinguish those components that are only different in name but not in function. In this application document, the terms "comprise", "include" and "have" are used in an open form, and therefore should be interpreted as meaning "including but not limited to...". In addition, the terms "substantially", "substantially" or "approximately" that may be used in this article relate to the tolerances of the corresponding terms accepted by the industry. The term "coupling" as may be used in this article includes direct coupling and indirect coupling via other components, elements, circuits, or modules, wherein for indirect coupling, the components, elements, circuits, or modules between them do not change the information of the signal but can adjust its current level, voltage level, and / or power level. Inferred coupling (for example, one of the elements is coupled to another element by inference) includes direct and indirect coupling between two elements in the same way as "coupling".

[0069] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0070] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0071] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A well logging acoustic receiving device, characterized in that: The receiving device comprises a plurality of acoustic receiving units connected in sequence, and each of the acoustic receiving units comprises a plurality of acoustic energy receiving crystals installed in different directions and a signal processing circuit.

2. A well logging acoustic receiving device according to claim 1, characterized in that: The receiving device comprises eight acoustic receiving units connected in sequence, each of the acoustic receiving units is provided with a central circular through hole in the axial direction, and flexible sound insulation rubber is installed between adjacent acoustic receiving units.

3. A well logging acoustic receiving device according to claim 1 or 2, characterized in that: All the acoustic receiving units in the receiving device are immersed in the silicone oil inside the capsule of the receiving device.

4. A well logging acoustic receiving device according to any one of claims 1 to 3, characterized in that: Each of the acoustic receiving units includes four acoustic energy receiving crystals installed at the same depth point, wherein the four acoustic energy receiving crystals receive acoustic waveforms in four different directions.

5. A well logging acoustic receiving device as claimed in claim 4, characterized in that: The four sound energy receiving crystals and one signal processing circuit included in each acoustic receiving unit are installed in an integrated manner.

6. A well logging acoustic receiving device as claimed in claim 4 or 5, characterized in that: In each of the acoustic receiving units, the signal processing circuit is installed on one side end surface of the acoustic energy receiving crystal fixing frame and is in the shape of a circular opening.

7. A well logging acoustic receiving device as claimed in claim 6, characterized in that: In each of the acoustic receiving units, the leads of the acoustic energy receiving crystal are connected to the signal processing circuit through a wire hole.

8. A well logging acoustic receiving device according to any one of claims 1 to 7, characterized in that: In each of the acoustic receiving units, the acoustic energy receiving crystal converts the received acoustic waveform into a differential electrical signal, and outputs it to the signal processing circuit. The signal processing circuit converts the differential signal to a single-ended signal, amplifies the primary signal, and then filters out the power frequency and high-frequency noise through a bandpass filter circuit, and finally outputs it to the signal measurement circuit board of the main line of the logging instrument for digital conversion.

9. A well logging acoustic receiving method, characterized in that: The method is performed by a receiving device according to any one of claims 1 to 8, wherein the receiving device comprises a plurality of acoustic receiving units connected in sequence, each of the acoustic receiving units comprises a plurality of acoustic energy receiving crystals installed in different directions and a signal processing circuit, and the method comprises: In each of the acoustic receiving units, the received acoustic waveform is converted into a differential electrical signal by the acoustic energy receiving crystal and output to the signal processing circuit; The signal processing circuit is used to convert the differential signal into a single-ended signal and amplify the primary signal, and then the power frequency and high-frequency noise are filtered out by the bandpass filter circuit, and finally the signal is output to the signal measurement circuit board of the main circuit of the logging instrument for digital conversion.

10. A storage medium, characterized in that: It contains a series of instructions for executing the method steps as claimed in claim 9.

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