CN113503157B - While-drilling transmitting transducer system in high-power polarized transmitting mode and preparation method thereof - Google Patents
While-drilling transmitting transducer system in high-power polarized transmitting mode and preparation method thereof Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 230000005284 excitation Effects 0.000 claims abstract description 18
- 230000004044 response Effects 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims description 111
- 239000000463 material Substances 0.000 claims description 53
- 230000008878 coupling Effects 0.000 claims description 48
- 238000010168 coupling process Methods 0.000 claims description 48
- 238000005859 coupling reaction Methods 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 18
- 230000010287 polarization Effects 0.000 claims description 18
- 239000003822 epoxy resin Substances 0.000 claims description 17
- 229920000647 polyepoxide Polymers 0.000 claims description 17
- 238000004806 packaging method and process Methods 0.000 claims description 11
- 239000011247 coating layer Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000012858 packaging process Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
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- 230000005404 monopole Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention belongs to the technical field of acoustic logging while drilling instruments, and particularly relates to a transmitting transducer system while drilling in a high-power polarized transmitting mode and a preparation method thereof. The transmitting while drilling transducer system comprises: 4 transducers arranged at intervals of 90 degrees form a circular ring type transducer group, wherein the forward or reverse wave field is generated by the 3 transducers under the action of the same excitation voltage; the remaining one transducer generates a wave field opposite to the direction of the 3 transducers under the action of the excitation voltage with the same amplitude and frequency but with a phase difference of 180 degrees, and 2 non-uniform wave fields are mutually superposed to generate a high-power polaron sound field. The system has the advantages of simple structure, stronger sound radiation power at the required frequency, more excellent admittance characteristics, effectively widened frequency bandwidth and better transmission voltage response of the transducer. Compared with the conventional polarized photon emission mode, the high-power polarized photon emission device has higher radiation energy and directivity, and the detection depth is deeper.
Description
Technical Field
The invention belongs to the technical field of acoustic logging while drilling instruments, and particularly relates to a transmitting transducer system while drilling in a high-power polarized transmitting mode and a preparation method thereof.
Background
As oil and gas exploration and development advance to complex reservoirs, horizontal wells and highly deviated wells are more widely applied, in order to control well tracks and enable drill bits to drill along the direction of the reservoirs, horizontal well logging and geosteering drilling are required, and cable logging instruments are time-consuming and labor-consuming and cannot be applied to unconventional well conditions. The acoustic logging while drilling technology can measure the longitudinal and transverse wave speeds of the stratum in the drilling process, indirectly obtain the pressure and geomechanical parameters of the stratum, realize the purposes of reservoir lithology identification, stratum overpressure detection, geosteering drilling and the like, and becomes an essential technical means for unconventional oil and gas exploitation. Compared with the conventional cable acoustic logging instrument, the acoustic logging-while-drilling instrument is greatly interfered by drilling tool noise, drilling fluid circulating noise and drill collar waves in the operation process, and the high-performance acoustic transmitting transducer while drilling can effectively improve the signal-to-noise ratio.
The acoustic emission transducer while drilling is one of core structures of acoustic logging while drilling, when logging operation is carried out, an exciting circuit generates a high-voltage pulse signal with certain frequency to drive the transducer to radiate an acoustic signal to a stratum, and the energy and frequency components of the signal directly influence whether an acquisition end can receive an effective stratum signal. The impedance characteristic and the power radiation characteristic of the transducer have important influence on logging signals, and the current azimuth acoustic logging while drilling technology only enables 1 transducer to work while drilling, generates a polariton sound field in a well hole and measures azimuth signals. In this case, the performance of the transducer and the excitation mode of the polarization mode are important.
Along with the continuous advance of China in the field of unconventional oil and gas field exploration, the importance of the acoustic logging-while-drilling instrument is increasingly prominent in the face of unconventional reservoirs with more complex geological environments, and a high-performance and high-power transmitting transducer is a technical difficulty. In the conventional acoustic wave while drilling instrument, only a single epoxy resin or rubber material is used for packaging the transducer, and the coupling of the structure of the internal piezoelectric ceramic piece and other materials is not fully researched, so that the excitation power is limited, and even if the voltage of a previous-stage excitation circuit is increased, the emission power cannot be further increased. And for the current acoustic logging while drilling of the polaron orientation, only one transducer is used for working, the radiated acoustic energy is limited, and when the drilling noise is large, the formation signal cannot be measured.
Disclosure of Invention
The invention discloses a transmitting transducer system while drilling with a high-power polaron transmitting mode, which aims to solve any of the technical problems and other potential problems in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: a transmit-while-drilling transducer system with a high power polaron transmit mode, the transmit-while-drilling transducer system comprising: 4 transducers arranged at intervals of 90 degrees form a circular ring type transducer group, wherein the forward or reverse wave field is generated by the 3 transducers under the action of the same excitation voltage;
the other transducer generates a wave field opposite to the direction of the 3 transducers under the action of excitation voltages with the same amplitude and frequency but 180-degree phase difference;
2 non-uniform wave fields (which means that the wavelength energy values are not equal) are mutually superposed to generate a high-power polarization sub sound field.
Furthermore, the emission voltage response of the high-power polarization sub sound field can be improved by at least 8dB, the bandwidth is improved by 10kHz, and the polarization directivity sound pressure intensity is increased by at least 3.0 times.
Further, the transducer includes: the piezoelectric ceramic plate comprises an upper piezoelectric ceramic plate, a lower piezoelectric ceramic plate, a coupling material and a coating layer;
the coupling material is arranged between the upper piezoelectric ceramic and the lower piezoelectric ceramic, the surface of the coupling material is plated with insulating paint (for preventing metal conduction), and the coating layer is coated outside the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material.
Furthermore, the radians of the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material are the same, the sizes and the materials of the upper piezoelectric ceramic and the lower piezoelectric ceramic are the same, and the radians are 80-89 degrees.
Furthermore, the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate are made of PZT-4 or PZT-5A, and the structure of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate is adopted to adjust the integral frequency response of the transducer in order to add a coupling material, so that the radiation power of the transducer is improved;
the coupling material is metal and is used for improving the frequency response of the piezoelectric ceramic plate;
the coating is an epoxy resin for fixing and withstanding the external environment of the borehole.
Further, the metal includes copper, iron, or aluminum.
Furthermore, the thickness of the coupling material is L, and the value range of L is 2-8 mm.
Another object of the present invention is to provide a method for preparing the transmitting transducer while drilling system, which comprises the following steps:
s1) selecting the radians and related parameters of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate;
s2) determining the radian and the thickness value L of the coupling material according to the radians of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate and related parameters;
s3) connecting the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate in parallel, respectively welding positive and negative electrodes on the inner side and the outer side of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate, placing a coupling material between the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate, fixing the coupling material by using a bonding agent, packaging the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material by using epoxy resin, and obtaining the transducer, wherein the radian of the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material is 90 degrees after packaging;
s4) forming a circular ring by the obtained 4 transducers at intervals of 90 degrees and embedding the circular ring in a drill collar, thus obtaining the transmitting transducer system while drilling with a high-power polarizing transmitting mode.
Further, the thickness L of the coupling material in S2) is obtained by the following formula:
L＝K-2x-2H
in the formula: l is the thickness of the coupling material, H is the thickness of the monolithic piezoelectric ceramic, K is the thickness of the entire transducer, and x is the distance of the internal piezoelectric ceramic from the top or bottom surface.
Further, the packaging process in the S # comprises the following steps: the thickness distance between the upper piezoelectric ceramic and the lower piezoelectric ceramic and the external epoxy resin is 2-6mm, and the radial distance between the upper piezoelectric ceramic and the lower piezoelectric ceramic and the epoxy resin is 1-3mm, so that the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material in the middle are kept in the middle of epoxy resin packaging.
The invention has the beneficial effects that: by adopting the technical scheme, the invention has the advantages of simple structure, stronger sound radiation power at the required frequency, more excellent admittance characteristics, effectively widened frequency bandwidth and better transmission voltage response of the transducer. Compared with theoretical and experimental calculation, the method is more convenient and faster. Compared with a conventional polarized photon emission mode, the polarized photon emission mode has higher radiation energy and directivity, the emission voltage response can be improved by 10dB, and the sound pressure intensity in the polarized directivity direction is increased by 3.8 times, so that the azimuth detection depth of the instrument in the mode can be increased.
Drawings
Fig. 1 is a schematic view of a loading mode of a high-power polarization mode excitation signal according to the present invention.
FIG. 2 is a schematic structural diagram of a transmitting transducer while drilling in a high power polaron transmitting mode according to the present invention.
FIG. 3 is a schematic diagram of the packaging of a high power polaron transmitting mode while drilling transmitting transducer of the present invention.
Fig. 4 is a schematic diagram of an excitation voltage signal for a transducer system of the present invention.
Fig. 5 is a schematic diagram of a real pool experimental site of the high-power polarization mode transducer system of the present invention.
FIG. 6 is a schematic diagram of the results of a comparative test of the high power polarized sub-mode transducer system of the present invention and a conventional polarized sub-transducer in a water bath;
fig. 6a is a schematic diagram comparing admittance curves, fig. 6b is a schematic diagram comparing power generation curves, fig. 6c is a schematic diagram comparing emission voltage curves, fig. 6d is a schematic diagram comparing directivity curves, and fig. 6e is a schematic diagram comparing sound pressure and axial distance curves.
Fig. 7 is a schematic diagram of a prior art polarized sub-transducer system.
In the figure:
1. the piezoelectric ceramic plate comprises an upper piezoelectric ceramic plate, 2 lower piezoelectric ceramic plates, 3 coupling materials, 4 cladding layers, 5 forward transducers and 6 reverse transducers.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
The invention relates to a transmitting transducer system while drilling in a high-power polaron transmitting mode, which comprises: 4 transducers arranged at intervals of 90 degrees form a circular ring type transducer group, wherein the forward or reverse wave field is generated by the 3 transducers under the action of the same excitation voltage;
the remaining one transducer generates a wave field opposite to the direction of the 3 transducers under the action of excitation voltages with the same amplitude and frequency but opposite phases, as shown in fig. 1 and 2;
and 2 uneven wave fields are mutually superposed to generate a high-power polarization sub sound field.
The emission voltage response of the high-power polarization sub sound field can be improved by at least 8dB, the bandwidth is improved by 10kHz, and the polarization directivity sound pressure intensity is increased by at least 3.0 times.
As shown in fig. 3, the transducer includes: the piezoelectric ceramic plate comprises an upper piezoelectric ceramic plate, a lower piezoelectric ceramic plate, a coupling material and a coating layer;
the coupling material is arranged between the upper piezoelectric ceramic and the lower piezoelectric ceramic, the surface of the coupling material is plated with insulating paint, and the coating layer is coated outside the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material.
The radian of the upper piezoelectric ceramic, the radian of the lower piezoelectric ceramic and the radian of the coupling material are the same, the size and the material of the upper piezoelectric ceramic and the size and the material of the lower piezoelectric ceramic are the same, and the radian is 80-89 degrees.
The upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate are made of PZT-4 or PZT-5A;
the coupling material is metal;
the coating layer is made of epoxy resin.
The metal comprises copper, iron or aluminum.
The thickness of the coupling material is L, and the value range of L is 2-8 mm.
A method for preparing a transmitting transducer system while drilling comprises the following steps:
s1) selecting the radians and related parameters of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate;
s2) determining the radian and the thickness value L of the coupling material according to the radians of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate and related parameters;
s3) connecting the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate in parallel, respectively welding positive and negative electrodes on the inner side and the outer side of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate, placing a coupling material between the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate, fixing the coupling material by using a bonding agent, packaging the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material by using epoxy resin, and obtaining the transducer, wherein the radian of the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material is 90 degrees after packaging;
s4) forming a circular ring by the obtained 4 transducers at intervals of 90 degrees and embedding the circular ring in a drill collar, thus obtaining the transmitting transducer system while drilling with a high-power polarizing transmitting mode.
The thickness L of the coupling material in S2) is obtained by the following formula:
L＝K-2x-2H
in the formula: l is the thickness of the coupling material, H is the thickness of the monolithic piezoelectric ceramic, K is the thickness of the entire transducer, and x is the distance of the internal piezoelectric ceramic from the top or bottom surface.
As shown in fig. 3, the packaging process in S # is as follows: the thickness distance between the upper piezoelectric ceramic and the lower piezoelectric ceramic and the external epoxy resin is 2-6mm, and the radial distance between the upper piezoelectric ceramic and the lower piezoelectric ceramic and the epoxy resin is 1-3mm, so that the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material in the middle are kept in the middle of epoxy resin packaging.
Example (b):
according to the size of a transducer system structure in a required acoustic logging while drilling instrument, the sizes of an external epoxy resin package, an upper piezoelectric ceramic plate and a lower piezoelectric ceramic plate are determined, and the optimal thickness of a coupling material is determined by parametric scanning.
Transducers were fabricated and compared experimentally with prior art transducers in the polarized emitter mode.
The prior art schematic diagram of the polarization mode transducer (as shown in fig. 7) was experimentally compared in an ultrasonic bath with the existing polarization mode and with the easily conceived polarization mode.
Final experimental results as can be seen from fig. 6, 4 transducers of the transmitting while drilling transducer system with high power polaron transmitting mode of the present invention operate simultaneously under the same excitation voltage, wherein the excitation voltages applied to three transducers are identical (amplitude, frequency, phase), the excitation voltage of the remaining transducer is identical in amplitude and frequency except that the excitation voltages of the other three transducers are opposite in phase, 2 wave fields with opposite phases are generated, 2 uneven wave fields are superimposed to generate a high power polaron acoustic field, the admittance curve contrast between the two (as shown in fig. 6 a), the transmitting power curve contrast (as shown in fig. 6 b), the transmitting voltage curve contrast (as shown in fig. 6 c), the directivity curve contrast (as shown in fig. 6 d), the acoustic pressure and axial distance curve contrast (as shown in fig. 6 e), the circle marks in the figure are the improvement conditions of the transmitting voltage response, admittance characteristics and transmitting power at the frequency required by the acoustic wave while drilling, the transmitting voltage response improvement of the sound field is finally obtained, the energy of the transducer in the prior art can be improved by at least 10dB, the bandwidth is improved by 10kHz, the intensity of the polarization directivity sound pressure is increased by at least 3.0 times, compared with the traditional single-chip polarization mode or two-chip or three-chip work which is easy to think, when four-chip transducers are adopted to generate the homodromous wave field work, the monopole mode is adopted, the phase of the excitation voltage of the wave field generated by the transducer system is reversed, the wave field in the opposite direction is generated, and a new polarization mode is generated by the mode of non-uniform wave field superposition. And experiments prove that the polarization mode provided by the invention has better performance. The method is a brand new polaron emission mode, and can provide powerful sound source signals for directional acoustic logging while drilling.
Compared with the conventional transducer while drilling, the transducer while drilling designed by the invention has higher admittance value in the frequency band of 10-15kHz used for logging while drilling.
The transmitting transducer system while drilling in the high-power polarized transmitting mode and the preparation method thereof provided by the embodiment of the application are described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (8)
1. A method of preparing a transmit while drilling transducer system, the transmit while drilling transducer system comprising: 4 transducers arranged at intervals of 90 degrees form a circular ring type transducer group, wherein 3 transducers generate forward or backward wave fields under the action of the same excitation voltage;
the other transducer generates a wave field opposite to the direction of the 3 transducers under the action of the excitation voltage with the same amplitude and frequency but opposite phase;
the method is characterized by comprising the following steps of (1) generating a high-power polarization sub sound field after mutually superposing 2 uneven wave fields, wherein the method comprises the following steps:
s1) selecting the curvatures of the upper and lower piezoelectric ceramic plates and related parameters,
s2) determining the radian and thickness value of the coupling material according to the radians of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate and related parametersLThe following formula is used to obtain the following formula:
L=K-2x-2H
in the formula:Lin order to be able to measure the thickness of the coupling material,His the thickness of the upper or lower piezoelectric ceramic plate,Kis the thickness of the entire transducer,xthe distance between the internal piezoelectric ceramic and the top or the bottom surface is defined;
s3) connecting the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate in parallel, respectively welding positive and negative electrodes on the inner side and the outer side of the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate, placing a coupling material between the upper piezoelectric ceramic plate and the lower piezoelectric ceramic plate, fixing the coupling material by using a bonding agent, packaging the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material by using epoxy resin, and obtaining the transducer, wherein the radian of the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material is 90 degrees after packaging;
s4) forming a circular ring by the obtained 4 transducers at intervals of 90 degrees and embedding the circular ring in a drill collar, thus obtaining the transmitting transducer system while drilling with a high-power polarizing transmitting mode.
2. The method as claimed in claim 1, wherein the packaging process in S3) is: the thickness distance between the upper piezoelectric ceramic and the lower piezoelectric ceramic and the external epoxy resin is 2-6mm, and the radial distance between the upper piezoelectric ceramic and the lower piezoelectric ceramic and the epoxy resin is 1-3mm, so that the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material in the middle are kept in the middle of epoxy resin packaging.
3. The method according to claim 1, wherein the emission voltage response of the high-power polariton sound field prepared by the method can be improved by at least 8dB, the bandwidth is improved by 10kHz, and the intensity of the polarization directivity sound pressure is increased by at least 3.0 times.
4. The method of claim 1, wherein the transducer comprises: an upper piezoelectric ceramic plate, a lower piezoelectric ceramic plate, a coupling material and a coating layer,
the coupling material is arranged between the upper piezoelectric ceramic and the lower piezoelectric ceramic, the surface of the coupling material is plated with insulating paint, and the coating layer is coated outside the upper piezoelectric ceramic, the lower piezoelectric ceramic and the coupling material.
5. The method of claim 4, wherein the upper piezoelectric ceramic, the lower piezoelectric ceramic, and the coupling material have the same arc, and wherein the upper piezoelectric ceramic and the lower piezoelectric ceramic are the same size and material, and wherein the arc is 80-89 °.
6. The method of claim 5, wherein the upper and lower piezoelectric ceramic plates are made of PZT-4 or PZT-5A; the coupling material is metal; the coating layer is made of epoxy resin.
7. The method of claim 6, wherein the metal comprises copper, iron, or aluminum.
8. The method of claim 4, wherein the coupling material has a thickness ofL,LThe value range is 2-8 mm.
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| US7207397B2 (en) * | 2003-09-30 | 2007-04-24 | Schlumberger Technology Corporation | Multi-pole transmitter source |
| GB2521372B (en) * | 2013-12-17 | 2020-03-04 | Reeves Wireline Tech Ltd | Acoustic logging apparatuses and methods |
| CN107762494A (en) * | 2016-08-19 | 2018-03-06 | 中国石油集团长城钻探工程有限公司 | With brill dipole acoustic log instrument and acoustic logging method |
| CN109025969B (en) * | 2018-08-28 | 2019-05-10 | 中国科学院地质与地球物理研究所 | One kind is with brill orientation acoustic logging device and measurement method |
| US11519255B2 (en) * | 2018-10-16 | 2022-12-06 | Halliburton Energy Services, Inc. | Downhole tool dynamic and motion measurement with multiple ultrasound transducer |
| US11650346B2 (en) * | 2019-08-15 | 2023-05-16 | Halliburton Energy Services, Inc. | Downhole acoustic measurement |
| CN110905490A (en) * | 2019-12-09 | 2020-03-24 | 中国科学院地质与地球物理研究所 | FPGA-based multi-pole while-drilling acoustic logging instrument excitation method and device |
| CN111257944B (en) * | 2020-02-07 | 2022-08-30 | 中国石油天然气集团有限公司 | Multipole transmitting transducer of while-drilling multipole acoustic imaging logging instrument and working method thereof |
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