Sound wave receiver

Abstract

The invention discloses a sound wave receiver, which is applied to the technical field of oil well logging and comprises a columnar framework, a plurality of grooves are formed in the periphery of the framework, and the grooves are uniformly distributed in the circumferential direction of the framework; a bracket is arranged in the groove and divides the groove into a first cavity and a second cavity; the first cavity is provided with a receiving transducer assembly, the second cavity is provided with a receiving pre-amplification circuit board assembly, and the receiving transducer assembly and the receiving pre-amplification circuit board assembly in the same groove are electrically connected. By arranging the receiving transducer assembly and the pre-amplifier circuit board assembly which are close to each other and electrically connected on the surface of the framework, electric signals collected by the receiving transducer assembly can be transmitted to the pre-amplifier circuit board assembly for signal filtering optimization and amplification enhancement through a very short distance, so that the signal quality and the anti-interference performance can be effectively improved; therefore, the sound wave receiver has a high signal-to-noise ratio.

Description

Technical Field

[0001] This invention relates to the field of oil well logging technology, and in particular to an acoustic receiver. Background Technology

[0002] The acoustic receiving unit of a long-range acoustic sounding instrument often uses parallel connected sheet piezoelectric ceramics to form an independent multi-pole receiving transducer unit, which is then transmitted to the receiving circuit via a long signal cable. In this type of acoustic receiving unit, the signal quality degrades significantly after long-distance transmission. Furthermore, due to the long-distance transmission, the signal is highly susceptible to strong electromagnetic interference from external sources and during acoustic emission. This independent receiving unit is unsuitable for long-range acoustic sounding instruments used to receive weak acoustic signals or reflected acoustic signals from outside the well. Additionally, the double-layer structure of sheet piezoelectric ceramics and a metal skeleton in this type of receiving unit makes it difficult to attenuate acoustic signals from different directions, hindering the differentiation of the directional characteristics of multi-pole acoustic signals from long-range acoustic sounding. Therefore, providing an acoustic receiver with a high signal-to-noise ratio is a problem urgently needing to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a sound wave receiver with a high signal-to-noise ratio.

[0004] To solve the above-mentioned technical problems, the present invention provides a sound wave receiver, including a columnar skeleton, wherein a plurality of grooves are formed on the outer periphery of the skeleton, and the plurality of grooves are evenly distributed along the circumferential direction of the skeleton.

[0005] A bracket is provided in the groove, which divides the groove into a first cavity and a second cavity; the first cavity is provided with a receiving transducer assembly, and the second cavity is provided with a receiving preamplifier circuit board assembly. The receiving transducer assembly and the receiving preamplifier circuit board assembly are electrically connected in the same groove.

[0006] Optionally, the bracket divides the groove into a first cavity and a second cavity that overlap in the radial direction, with the first cavity located on the side of the second cavity away from the center of the skeleton.

[0007] Optionally, the receiving transducer assembly is fixed to the first cavity by a transducer gasket, and the transducer gasket fills the gap between the receiving transducer assembly and the first cavity.

[0008] Optionally, the receiving preamplifier circuit board assembly is fixed to the second cavity by a circuit board spacer, and the circuit board spacer is located between the receiving preamplifier circuit board assembly and the skeleton in the radial direction.

[0009] Optionally, the sidewalls of the skeleton forming the groove are provided with through holes for wiring.

[0010] Optionally, the through hole extends from the groove to at least one end face of the skeleton in the axial direction.

[0011] Optionally, the outer periphery of the skeleton is provided with a receiving circuit board connection groove, which is located between adjacent grooves and connects to the adjacent second cavity.

[0012] Optionally, the skeleton includes a through hole extending through the skeleton along the axial direction, and a fixing cable is disposed in the through hole.

[0013] Optionally, the receiving transducer assembly includes two stacked piezoelectric ceramic sheets, which are polarized along the thickness direction;

[0014] The positive electrode side surface of one piezoelectric ceramic sheet is in contact with and electrically connected to the negative electrode side surface of another piezoelectric ceramic sheet, so that the two piezoelectric ceramic sheets are connected in series.

[0015] Optionally, the receiving transducer assembly further includes a negative electrode conductive sheet and a positive electrode conductive sheet, wherein the negative electrode conductive sheet is bonded to the exposed negative electrode side surface of the two stacked piezoelectric ceramic sheets, and the positive electrode conductive sheet is bonded to the exposed positive electrode side surface of the two stacked piezoelectric ceramic sheets.

[0016] The present invention provides an acoustic wave receiver comprising a columnar frame, wherein a plurality of grooves are formed on the outer periphery of the frame and the plurality of grooves are evenly distributed along the circumferential direction of the frame; a bracket is disposed in the groove, the bracket dividing the groove into a first cavity and a second cavity; a receiving transducer assembly is disposed in the first cavity, and a receiving preamplifier circuit board assembly is disposed in the second cavity, wherein the receiving transducer assembly and the receiving preamplifier circuit board assembly are electrically connected in the same groove.

[0017] By setting a receiving transducer assembly and a preamplifier circuit board assembly with adjacent electrical connections on the surface of the skeleton, the electrical signal collected by the receiving transducer assembly can be transmitted to the preamplifier circuit board assembly for signal filtering optimization and amplification enhancement over a very short distance. This can effectively improve signal quality and anti-interference performance, giving the acoustic receiver a high signal-to-noise ratio. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is an exploded structural diagram of a sound wave receiver provided in an embodiment of the present invention;

[0020] Figure 2 From a first-person perspective Figure 1 Composite image;

[0021] Figure 3 From a second perspective Figure 1 Composite image;

[0022] Figure 4 for Figure 1 A comparison diagram of the amplitudes of reflected waves received by the receiving transducer assembly from opposite directions;

[0023] Figure 5 This is a schematic diagram of the structure of a specific receiving transducer assembly provided in an embodiment of the present invention;

[0024] Figure 6 A comparison graph of the sensitivity of the receiving transducer components;

[0025] Figure 7 This is a schematic diagram of a preamplifier circuit provided in an embodiment of the present invention.

[0026] In the diagram: 2. Receiver transducer assembly, 3. Transducer gasket, 4. Bracket, 6. Receiver preamplifier circuit board assembly, 7. Circuit board gasket, 8. Frame, 9. Through hole, 10. Screw, 11. Receiver circuit board wiring groove, 12. End face screw hole, 13. Through hole;

[0027] 211. Negative electrode conductive sheet; 212. Conductive adhesive; 213. Piezoelectric ceramic sheet; 214. Positive electrode conductive sheet. Detailed Implementation

[0028] The core of this invention is to provide an acoustic wave receiver. In the prior art, the acoustic wave receiving unit of acoustic long-range sounding instruments often uses sheet-like piezoelectric ceramics connected in parallel to form an independent multi-pole receiving transducer unit, which is then sent to the receiving circuit in the isolated instrument circuit unit via a long signal cable. The acoustic wave signal received in this acoustic wave receiving unit will have its signal quality significantly degraded after being transmitted over a long distance via a signal cable; in addition, because the signal needs to be transmitted over a long distance, the signal is extremely susceptible to strong electromagnetic interference from external sources and generated during the acoustic wave transmission process. This independent receiving unit is not suitable for acoustic long-range sounding instruments used to receive weak acoustic wave signals or reflected acoustic wave signals from outside the well.

[0029] The acoustic receiver provided by the present invention includes a columnar skeleton with multiple grooves formed on the outer periphery of the skeleton, the multiple grooves being evenly distributed along the circumferential direction of the skeleton; a bracket is disposed in the groove, the bracket dividing the groove into a first cavity and a second cavity; a receiving transducer assembly is disposed in the first cavity, and a receiving preamplifier circuit board assembly is disposed in the second cavity, the receiving transducer assembly and the receiving preamplifier circuit board assembly being electrically connected in the same groove.

[0030] By setting a receiving transducer assembly and a preamplifier circuit board assembly with adjacent electrical connections on the surface of the skeleton, the electrical signal collected by the receiving transducer assembly can be transmitted to the preamplifier circuit board assembly for signal filtering optimization and amplification enhancement over a very short distance. This can effectively improve signal quality and anti-interference performance, giving the acoustic receiver a high signal-to-noise ratio.

[0031] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] Please refer to Figures 1 to 4 , Figure 1 This is an exploded structural diagram of a sound wave receiver provided in an embodiment of the present invention; Figure 2 From a first-person perspective Figure 1 Composite image; Figure 3 From a second perspective Figure 1 Composite image; Figure 4 for Figure 1 A comparison diagram of the amplitudes of reflected waves received by the receiving transducer assembly from opposite directions.

[0034] See Figures 1 to 3 In this embodiment of the invention, the acoustic receiver includes a columnar frame 8, with multiple grooves formed on the outer periphery of the frame 8, the multiple grooves being evenly distributed along the circumferential direction of the frame 8; a bracket 4 is disposed in the groove, the bracket 4 dividing the groove into a first cavity and a second cavity; a receiving transducer assembly 2 is disposed in the first cavity, and a receiving preamplifier circuit board assembly 6 is disposed in the second cavity, the receiving transducer assembly 2 and the receiving preamplifier circuit board assembly 6 being electrically connected in the same groove.

[0035] The aforementioned frame 8 is the main supporting structure of the multipole acoustic wave receiving unit. It is typically columnar, thus having three directions: axial, circumferential, and radial. Multiple grooves are formed on the outer periphery of the frame 8. These grooves are used to house the receiving transducer assembly 2 and the receiving preamplifier circuit board assembly 6. The receiving transducer assembly 2 and the receiving preamplifier circuit board assembly 6, both located within the same groove, need to be electrically connected to ensure that only a small distance is required for signal transmission between them. The specific structures of the receiving transducer assembly 2 and the receiving preamplifier circuit board assembly 6 will be described in detail in the following embodiments of the invention, and will not be repeated here.

[0036] The aforementioned skeleton 8 needs to be a non-magnetic skeleton 8 to ensure the performance of the sound wave receiver. Specifically, the main body of the skeleton 8 can be made of stainless steel, a non-magnetic metal material. That is, the skeleton 8 can be made of stainless steel, a non-magnetic skeleton 8. This material has a large mass, which can prevent the vibration generated during the reception of sound wave signals from causing noise to the receiving transducer assembly 2 when receiving sound wave signals, thereby further improving the quality of the sound wave received signal. The non-magnetic material can also prevent the electromagnetic signals generated during the sound wave transmission process from interfering with the high-precision reception of the receiving transducer assembly 2, thus improving the quality of the received signal. Of course, in this embodiment, the specific material of the skeleton 8 is not specifically limited, and it depends on the specific situation.

[0037] The outer periphery of the aforementioned frame 8 is provided with a plurality of grooves evenly distributed along the circumferential direction. Each groove is divided into a first cavity and a second cavity by a bracket 4. A receiving transducer assembly 2 is disposed in the first cavity, resulting in a plurality of receiving transducer assemblies 2 evenly distributed along the circumferential direction on the outer periphery of the frame 8. Typically, four, six, or eight receiving transducer assemblies 2 are evenly distributed along the circumferential direction on the outer periphery. Specifically, four receiving transducer assemblies 2 can form a four-component receiving transducer assembly 2, which is typically evenly distributed at 90° intervals along the circumferential direction; six receiving transducer assemblies 2 can form a six-component receiving transducer assembly 2, which is typically evenly distributed at 60° intervals along the circumferential direction; and eight receiving transducer assemblies 2 can form an eight-component receiving transducer assembly 2, which is typically evenly distributed at 45° intervals along the circumferential direction. The number of receiving transducer assemblies 2 is not specifically limited in this embodiment and depends on the specific circumstances.

[0038] The aforementioned second cavity houses a receiving preamplifier circuit board assembly 6, resulting in multiple receiving preamplifier circuit board assemblies 6 evenly distributed circumferentially on the outer periphery of the frame 8, with each receiving preamplifier circuit board assembly 6 corresponding one-to-one with the receiving transducer assembly 2. The main function of this receiving preamplifier circuit board assembly 6 is to filter, optimize, and amplify the electrical signal from the receiving transducer assembly 2, improving signal quality and anti-interference performance. In this embodiment, since the receiving transducer assembly 2 and its corresponding receiving preamplifier circuit board assembly 6 are both located in the same recess, only a short transmission line is needed to connect them. This allows the minute current generated by the receiving transducer assembly 2 to be transmitted to the corresponding receiving preamplifier circuit board assembly 6 for filtering and amplification via a very short path, ensuring that the signal is largely unaffected during transmission and guaranteeing a high signal-to-noise ratio for the multipole acoustic wave receiving unit.

[0039] The aforementioned bracket 4 is typically a high-strength bracket 4. Specifically, in this embodiment, the bracket 4 divides the groove into a first cavity and a second cavity that overlap radially. The first cavity is located on the side of the second cavity away from the center of the skeleton 8. That is, the uppermost layer in the groove is the receiving transducer assembly 2, and the bracket 4 is provided below the receiving transducer assembly 2. The receiving preamplifier circuit board assembly 6 is provided below the bracket 4. Typically, a certain space needs to be reserved between the bracket 4 and the receiving preamplifier circuit board assembly 6 to protect the receiving preamplifier circuit board assembly 6 from direct connection with the bracket 4 and damage to the circuit board assembly. The lower part of the receiving preamplifier circuit board assembly 6 is the surface of the skeleton 8, that is, the bottom surface of the groove.

[0040] In this embodiment, the receiving transducer assembly 2 is fixed to the first cavity by a transducer gasket 3, which fills the gap between the receiving transducer assembly 2 and the first cavity. The transducer gasket 3 can be made of high-temperature fluororubber and must be positioned at least adjacent to the bottom of the receiving transducer assembly 2. The gasket 3 is typically surrounded by a high edge to further fill the gap between the receiving transducer assembly 2 and the first cavity. The transducer gasket 3 serves two purposes: firstly, as a buffer to protect the receiving transducer assembly 2; and secondly, to enclose the receiving transducer assembly 2, preventing it from moving vertically or horizontally, thus confining it to a non-free state. This prevents the receiving transducer assembly 2 from swinging downhole, thus preventing noise signals from being converted and improving conversion accuracy. Furthermore, the transducer gasket 3 also ensures insulation between the receiving transducer assembly 2 and the support 4 to guarantee signal accuracy and quality.

[0041] In this embodiment, the receiving preamplifier circuit board assembly 6 is fixed to the second cavity by a circuit board gasket 7, which is located between the receiving preamplifier circuit board assembly 6 and the frame 8 in the radial direction. The receiving preamplifier circuit board assembly 6 typically includes an upper insulating protective pad and a lower preamplifier circuit board. The insulating protective pad is used to prevent the support 4 from deforming due to excessive downhole pressure, causing direct contact between the two and the circuit board, which could result in a short circuit or damage to the circuit board. The main function of the receiving preamplifier circuit board assembly 6 is to filter, optimize, amplify, and enhance the electrical signal from the receiving transducer assembly 2, thereby improving signal quality and anti-interference performance. During operation, the receiving circuit board is exposed to the high-temperature and high-pressure environment downhole, requiring the use of high-temperature and high-pressure resistant components. The preamplifier circuit board can be a simple single-layer or double-layer circuit board, preferably equipped with only four components: resistors, capacitors, encapsulated operational amplifiers, and encapsulated electronic switches. This simplifies the circuitry, improves the tolerance and reliability to high-temperature and high-pressure conditions downhole, and saves space by integrating the receiving transducer assembly 2 and the receiving preamplifier circuit board assembly 6 into one unit. After the preamplifier circuit board is soldered and tested, it needs to be sprayed with an insulating and corrosion-resistant sealing material. This improves the reliability and stability of the circuitry and prevents damage to the preamplifier circuit board caused by impurities and corrosive gases present in the high-temperature oil during long-term use, effectively solving the problems of the preamplifier circuit board's resistance to high-temperature and high-pressure conditions and corrosion. The aforementioned circuit board gasket 7 is specifically located at the lower part of the receiving preamplifier circuit board assembly 6, and is placed between the preamplifier circuit board and the frame 8 to protect the preamplifier circuit board and prevent the preamplifier circuit board from being damaged or short-circuited due to direct contact with the frame 8.

[0042] In this embodiment, a receiving circuit board connection groove 11 is provided on the outer periphery of the skeleton 8. The receiving circuit board connection groove 11 is located between adjacent grooves and connects to adjacent second cavities. The receiving circuit board connection groove 11 is used for the connection between each receiving preamplifier circuit board assembly 6, mainly including power lines, signal lines, etc.

[0043] The aforementioned skeleton 8 has a through hole 13 on the side wall forming the groove for wiring. This through hole 13 guides the wiring of the receiving transducer assembly 2, facilitating cable fixation. Specifically, the through hole 13 extends from the groove to at least one end face of the skeleton 8 along the axial direction. This through hole 13 is used for wiring, allowing acoustic signal lines to pass through and exit. This facilitates the laying of acoustic signal lines, protects the acoustic signal lines, and also facilitates the individual disassembly, inspection, maintenance, and replacement of the receiver. The end face typically also has end face screw holes 12 for fixing terminals and ground wires, mainly including power supply and acoustic signal lines.

[0044] The end face screw hole 12 can be used to fix the ground wire in the receiving circuit board assembly. It uses an M3 screw and a metal washer to press the ground wire firmly to ensure a good electrical connection with the frame 8. In addition, an M3 insulated terminal block can be installed for power and signal distribution in the receiving circuit board assembly, reducing the number of cables entering and exiting in confined spaces to improve reliability and stability. The acoustic receiver has a multi-layered composite structure along the radial direction, which can effectively attenuate acoustic signals from opposite directions, causing a significant change in acoustic amplitude. This plays a positive role in distinguishing acoustic reflection signals from different directions. Figure 4 It can be seen that for the reflector located to the east of the sound wave receiver, the amplitude of the received signal from AC East by the east receiving transducer component 2 is significantly higher than the received signal from AC West by the west receiving transducer component 2. This method can effectively distinguish whether the sound wave signal comes from the east or the west.

[0045] A screw 10 can be provided at the end of the frame 8. The screw 10 can be used to connect and fix the sound insulation component connected to the sound wave receiver. In addition, it can also be used to position the orientation. The screw 10 is usually at zero angle to keep the multi-component receiving transducer assembly 2 in the same direction.

[0046] In this embodiment, the frame 8 includes a through hole 9 extending through the frame 8 along the axial direction, and a fixing cable is disposed within the through hole 9. Specifically, the through hole 9 can be used to store through wires and power lines, output signal lines, and steel cables from the receiving preamplifier circuit board assembly 6. The steel cables are used for connecting the various acoustic receivers, linking multiple acoustic receivers along the axial direction. The steel cables serve both to fix the acoustic receivers and to eliminate noise between them.

[0047] The acoustic receiver provided in this embodiment, by setting a receiving transducer assembly 2 and a preamplifier circuit board assembly 6 that are electrically connected adjacently on the surface of the frame 8, allows the electrical signal collected by the receiving transducer assembly 2 to be transmitted to the preamplifier circuit board assembly 6 over a very short distance for signal filtering optimization and amplification enhancement. This can effectively improve signal quality and anti-interference performance, giving the acoustic receiver a high signal-to-noise ratio.

[0048] The specific details of the acoustic receiver provided by this invention will be described in detail in the following embodiments.

[0049] Example 2

[0050] Please refer to Figures 5 to 7 , Figure 5 This is a schematic diagram of the structure of a specific receiving transducer assembly provided in an embodiment of the present invention; Figure 6 A comparison graph of the sensitivity of the receiving transducer components; Figure 7This is a schematic diagram of a preamplifier circuit provided in an embodiment of the present invention.

[0051] Unlike the embodiments described above, the embodiments of the present invention further define the structure of the receiving transducer assembly 2 based on the embodiments described above. The remaining details have been described in detail in the embodiments described above and will not be repeated here.

[0052] See Figure 5 In this embodiment of the invention, the receiving transducer assembly 2 includes two piezoelectric ceramic sheets 213 stacked together, the piezoelectric ceramic sheets 213 being polarized along the same thickness direction; the positive electrode side surface of one piezoelectric ceramic sheet 213 is in contact with and electrically connected to the negative electrode side surface of the other piezoelectric ceramic sheet 213, so that the two piezoelectric ceramic sheets 213 are connected in series.

[0053] In this embodiment, the main structure of the receiving transducer assembly 2 consists of two piezoelectric ceramic sheets 213 connected in series. In this embodiment, the piezoelectric ceramic sheets 213 are polarized along their thickness direction; therefore, one surface is the positive electrode side surface, and the other surface is the negative electrode side surface. In this embodiment, the positive electrode side surface of one piezoelectric ceramic sheet 213 contacts and is electrically connected to the negative electrode side surface of the other piezoelectric ceramic sheet 213. That is, the two piezoelectric ceramic sheets 213 are stacked, and the two contacting surfaces are surfaces with opposite electrical polarities, thus connecting the two piezoelectric ceramic sheets 213 in series.

[0054] As shown in the table below, under the same conditions, compared with the parallel method, the capacitance of the receiving transducer assembly 2 in the series method is reduced by three-quarters, the driving capability of the cable is reduced, and the ability to connect long cables is weakened, but the sensitivity is doubled. This is extremely advantageous for instruments that detect weak reflected signals from distant sound waves. To address the reduction in cable driving capability, this embodiment sets up a receiving preamplifier circuit board assembly 6 near the receiving transducer assembly 2, which can significantly reduce the cable length for receiving sound signals and eliminate the adverse effects of weak driving. In addition, the addition of the preamplifier circuit can greatly improve the quality of the received signal, with the original received signal sensitivity increasing by 6 dB and the signal anti-interference capability also improved.

[0055] Table 1. Comparison of Series and Parallel Connections of Piezoelectric Ceramic Sheets

[0056] Comparison of contents in parallel Series capacitance value Sensitivity

[0057] C in the table above p C is the value of the parallel capacitor. s Where S is the series capacitance, h is the area of ​​the piezoelectric ceramic sheet 213, and m is the thickness of the piezoelectric ceramic sheet 213. p For parallel sensitivity, M s For series sensitivity, g 33Let g be the piezoelectric voltage constant along the crystal polarization direction. 31 Let be the piezoelectric voltage constant in the plane perpendicular to the polarization direction.

[0058] Specifically, in this embodiment, the receiving transducer assembly 2 further includes a negative electrode conductive sheet 211 and a positive electrode conductive sheet 214. The negative electrode conductive sheet 211 is attached to the exposed negative electrode side surface of the two stacked piezoelectric ceramic sheets 213, and the positive electrode conductive sheet 214 is attached to the exposed positive electrode side surface of the two stacked piezoelectric ceramic sheets 213.

[0059] The aforementioned negative electrode conductive sheet 211 and positive electrode conductive sheet 214 are used to bring out the corresponding electrodes. The entire stacked structure can be composed of 7 layers, which can be arranged from top to bottom as follows: negative electrode conductive sheet 211, conductive adhesive 212, piezoelectric ceramic sheet 213, conductive adhesive 212, piezoelectric ceramic sheet 213, conductive adhesive 212, and positive electrode conductive sheet 214. The adjacent sheets in the entire stacked structure are bonded together by conductive adhesive 212.

[0060] The piezoelectric ceramic sheet 213 is usually a rectangular sheet of piezoelectric ceramic. The connection between two piezoelectric ceramic sheets 213 is usually made by uniformly bonding them with high-temperature resistant conductive adhesive 212. Both piezoelectric ceramic sheets 213 are polarized in the thickness direction. The thickness direction of the two piezoelectric ceramic sheets 213 is aligned with the polarization direction and they are neatly stacked. The two piezoelectric ceramic sheets 213 are connected by conductive adhesive 212, that is, the negative electrode of one piezoelectric ceramic sheet 213 is bonded to the positive electrode of the other ceramic sheet.

[0061] When bonding ceramics together or between ceramics and electrodes, the conductive adhesive 212 is preferably used to perform a seamless bonding process at a temperature of 200℃ and a pressure of 300kg for up to 24 hours on two piezoelectric ceramic sheets 213. The preferred dimensions of the piezoelectric ceramic sheets 213 are 50.8mm × 25.4mm × 2.6mm. There are two leads: the aforementioned negative electrode conductive sheet 211 and positive electrode conductive sheet 214. The electrode dimensions are typically the same as the ceramic dimensions, with a thickness of approximately 0.05mm. Protruding solder holes are provided at the electrode leads of the negative electrode conductive sheet 211 and the positive electrode conductive sheet 214 for thorough welding of the wires to the solder holes. The negative electrode conductive sheet 211 and the positive electrode conductive sheet 214 are located at the top and bottom of the two ceramic sheets, respectively. Bonding is completed by only three bonding processes between the positive and negative leads and the ceramic sheets. Two piezoelectric ceramic plates 213 are stacked in sequence according to their polarization directions. The process is simple, and the quality and consistency of the receiving transducer assembly 2 are easily guaranteed. Moreover, the receiving sensitivity is significantly improved compared to the traditional parallel connection method, partly because the sensitivity is more than doubled due to the series connection. Figure 6 As can be seen from the diagram, the receiver used in this case has a significantly improved sensitivity compared to traditional parallel receivers.

[0062] like Figure 6 As shown, the receiving transducer assembly 2 used in this embodiment has a significantly improved sensitivity compared to the traditional parallel connection. Figure 6 For the sensitivity comparison of series and parallel connections in this embodiment, it can be seen that the sensitivity of the series connection is nearly 3 times higher than that of the parallel connection, approximately 10 dB. The receiving transducer assembly 2 of the above structure is used to receive the acoustic wave signal emitted from the sound source and reflected back by the strata. This assembly is located at the outermost part of the multipole acoustic wave receiving unit, with its negative electrode typically exposed at the outer end and the positive electrode inside.

[0063] like Figure 7 The diagram shows the circuit schematic of the receiving preamplifier circuit board assembly 6. The receiving preamplifier circuit board assembly 6 includes four preamplifier circuit boards, which are placed in the lower part of the brackets 4 in the four recesses. The upper part of the receiving preamplifier circuit board assembly 6 is protected by the brackets 4 to prevent pressure damage. There are insulating protective pads on the upper and lower sides to protect the circuit from direct contact with the metal outer wall and cause short circuit. The electrical signals Y1, Y2, X1, and X2 from the four directions after conversion from the receiving transducer assembly 2 are first impedance matched in an equal length manner. The impedance matching circuit includes R15, R25, R35, and R45. This circuit completes the impedance matching of the receiving transducer assembly 2 to obtain the maximum signal from the receiving transducer assembly 2. After signal matching, the signal enters an adjustable gain amplifier circuit consisting of four operational amplifiers U2 (U2A, U2B, U2C, U2D) and resistors R16-R19, R26-R29, R36-R39, and R46-R49, with gains of 1, 2, 4, and 8 respectively. Switches U3 and U4 select the gain signals G1 and G2 to control the gain of operational amplifier U2. After amplification, the four signals enter a four-channel filter circuit centered on operational amplifiers U1 (U1A, U1B, U1C, U1D), which includes resistors R11-R14, C11-C13, R21-R24, C21-C23, R31-R34, C31-C33, R41-R44, C41-C43, and the four operational amplifiers U1, with a frequency bandwidth range of 300 Hz - 30000Hz. This method achieves proximity amplification and filtering of four acoustic signals using simple circuit components. The circuit employs a single-layer or double-layer board, and its core components consist only of surface-mount metal film resistors, surface-mount ceramic capacitors, surface-mount plastic-encapsulated operational amplifiers, and surface-mount plastic-encapsulated electronic switching circuits. It boasts high reliability and stability, a small footprint, strong confining pressure resistance, and can withstand the high temperature and high pressure environment downhole. The four signals output from the receiving preamplifier circuit board assembly 6 are all transmitted via shielded cables, thus forming four component acoustic signals. Combined with a multi-layer composite receiving structure, this can be effectively used to identify the location of anomalies outside the well.

[0064] Conventional acoustic wave remote detection receiver units contain only sheet piezoelectric ceramics. In the strata, the converted electrical signal is extremely weak, typically only a few mV. Interference on the transmission cable also amounts to a few mV, meaning the interference signal is approximately 100% of the useful signal. This is undoubtedly extremely detrimental to acoustic wave signal reception. When these useful and interference signals are fed into subsequent preamplifier and filter circuits, they are synchronously amplified and filtered, but the signal-to-noise ratio remains poor and doesn't change significantly. In this embodiment, the receiving preamplifier circuit board assembly 6 and the receiving transducer assembly 2 are combined close together. This amplifies the useful signal by 10 times, reaching tens of mV. The amplified signal is then transmitted via a transmission cable to an isolated line unit. This reduces the interference on the transmission line to only about 10% of the useful signal, improving the signal-to-noise ratio by nearly 10 times.

[0065] In this embodiment, the receiving transducer assembly 2 uses piezoelectric ceramic sheets 213 connected in series, which has high acoustic wave receiving sensitivity. To address the shortcomings of reduced capacitance and short transmission distance, a dedicated integrated receiving preamplifier circuit board assembly 6 is set up under the receiving transducer assembly 2 to solve the problem, forming an integrated compact receiver. On the one hand, it achieves high-sensitivity conversion of the original acoustic wave signal, and on the other hand, it resists electromagnetic interference during transmission. The multi-layer composite structure can effectively distinguish reflected acoustic wave signals from different directions.

[0066] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A sound wave receiver, characterized in that, It includes a columnar skeleton, the outer periphery of which is formed with a plurality of grooves, the plurality of grooves being evenly distributed along the circumferential direction of the skeleton; A bracket is provided in the groove, which divides the groove into a first cavity and a second cavity; the first cavity is provided with a receiving transducer assembly, and the second cavity is provided with a receiving preamplifier circuit board assembly. The receiving transducer assembly and the receiving preamplifier circuit board assembly are electrically connected in the same groove.

2. The acoustic wave receiver according to claim 1, characterized in that, The bracket divides the groove into a first cavity and a second cavity that overlap in the radial direction, with the first cavity located on the side of the second cavity away from the center of the skeleton.

3. The acoustic wave receiver according to claim 2, characterized in that, The receiving transducer assembly is fixed to the first cavity by a transducer gasket, and the transducer gasket fills the gap between the receiving transducer assembly and the first cavity.

4. The acoustic wave receiver according to claim 2, characterized in that, The receiving preamplifier circuit board assembly is fixed to the second cavity by a circuit board gasket, and the circuit board gasket is located between the receiving preamplifier circuit board assembly and the skeleton in the radial direction.

5. The acoustic receiver according to claim 1, characterized in that, The sidewalls of the skeleton forming the groove are provided with through holes for wiring.

6. The acoustic wave receiver according to claim 5, characterized in that, The through hole extends from the groove to at least one end face of the skeleton in the axial direction.

7. The acoustic wave receiver according to claim 1, characterized in that, The outer periphery of the skeleton is provided with a receiving circuit board connection groove, which is located between adjacent grooves and connects to the adjacent second cavity.

8. The acoustic receiver according to claim 1, characterized in that, The frame includes a through hole extending through the frame along the axial direction, and a fixing cable is disposed in the through hole.

9. The acoustic receiver according to any one of claims 1 to 8, characterized in that, The receiving transducer assembly includes two piezoelectric ceramic sheets stacked together, wherein the piezoelectric ceramic sheets are polarized along the thickness direction; The positive electrode side surface of one piezoelectric ceramic sheet is in contact with and electrically connected to the negative electrode side surface of another piezoelectric ceramic sheet, so that the two piezoelectric ceramic sheets are connected in series.

10. The acoustic receiver according to claim 9, characterized in that, The receiving transducer assembly further includes a negative electrode conductive sheet and a positive electrode conductive sheet. The negative electrode conductive sheet is attached to the exposed negative electrode side surface of the two stacked piezoelectric ceramic sheets, and the positive electrode conductive sheet is attached to the exposed positive electrode side surface of the two stacked piezoelectric ceramic sheets.

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