CN216718719U - Array sound wave measuring system of groove-free sound insulation device in laboratory - Google Patents
Array sound wave measuring system of groove-free sound insulation device in laboratory Download PDFInfo
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- CN216718719U CN216718719U CN202123104487.2U CN202123104487U CN216718719U CN 216718719 U CN216718719 U CN 216718719U CN 202123104487 U CN202123104487 U CN 202123104487U CN 216718719 U CN216718719 U CN 216718719U
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Abstract
The utility model discloses an array sound wave measuring system of a sound insulating device without a notch in a laboratory, which comprises an array sound wave measuring instrument, a collecting communication system and a portable computer, wherein the collecting communication system comprises a sound insulating device and a sound insulating device; the array sound wave measuring instrument comprises a transmitting device, a sound insulation device and a receiving device which are sequentially connected together through threads; the acquisition communication system comprises a network communication circuit, a power supply circuit, a data acquisition and processing circuit, an acoustic wave transmitting circuit and a receiving preprocessing circuit, wherein the acoustic wave transmitting circuit is electrically connected with a transmitting device of the array acoustic wave measuring instrument, the receiving preprocessing circuit is electrically connected with a receiving device of the array acoustic wave measuring instrument, and the power supply circuit supplies power to the array acoustic wave measuring instrument and the acquisition communication system. Through designing a simple structure, reasonable in design, sound insulation is effectual and have the sound arrester of certain degree tensile and compressive strength, realize the miniaturization of array sound wave measurement system in the laboratory.
Description
Technical Field
The utility model belongs to the acoustic logging direction in the field of petroleum logging in laboratories of colleges and universities, and particularly relates to an array acoustic wave measurement system of a trenchless sound insulation device in a laboratory in the field.
Background
In recent years, a laboratory large-scale stratum model is established in many colleges and universities in China for monitoring the enrichment process of the natural gas hydrate, and the accumulation rule and the enrichment mode of the natural gas hydrate are known by measuring the physical characteristics of rocks such as the acoustic time difference and the resistivity of the sediments containing the hydrate, so that the method has important significance for the development of natural gas with hydrates of different production states such as loose type, frozen soil type and the like in China. In order to obtain the representation of the spatial distribution of the hydrate, the dynamic change of the storage parameters and the fine scales of the storage parameters, a miniaturized array acoustic wave measurement system in a laboratory needs to be developed, and the characteristics of the stratum around the well are detected under the condition of truly simulating the well logging environment. The array sound wave measuring system collects monopole waveforms and dipole waveforms through the transmitting part and the receiving part, and calculates time difference curves of longitudinal waves, transverse waves and Stoneley waves by using a time difference extraction method.
The miniaturized array acoustic logging measurement system can provide monopole waveforms and dipole waveforms of different depth sections for a laboratory stratum model, time difference curves of longitudinal waves, transverse waves and Stoneley waves of the stratum in the laboratory are effectively obtained, and quantitative geological evaluation is carried out on the laboratory stratum model. The sound insulation device is one of the key points of the design of the measuring system, is positioned between an instrument transmitting device and a receiving device, and has the main functions of effectively delaying direct waves propagating along an instrument shell in a wide frequency range and improving the signal-to-noise ratio of monopole wavelet reception.
In the well logging measurement and evaluation, the acoustic wave time difference plays an important role in the aspects of researching mechanical properties of rocks, identifying gas layers and cracks, analyzing well wall stability and the like. The array acoustic logging is an irreplaceable measuring tool for obtaining the time difference information of longitudinal waves and transverse waves of rocks by the current exploratory well. However, the traditional monopole acoustic logging instrument can only measure the longitudinal wave time difference of the stratum and has the defects of the traditional monopole acoustic logging instrument; most of sound insulation devices of the existing array sound wave instrument can realize sound insulation effect only by grooving, and the grooving is a challenge which is difficult to overcome in the aspect of miniaturization of the array sound wave instrument. In order to achieve the purpose of effective sound insulation and avoid the processing difficulty of the notch on the instrument shell, a sound insulation device which has a simple structure, is reasonable in design, has a good sound insulation effect and meets the experimental requirements needs to be designed.
Disclosure of Invention
The utility model aims to provide an array sound wave measuring system without a grooving sound insulation device in a laboratory, which can effectively measure the time difference of longitudinal waves, transverse waves and Stoneley waves of a model stratum in the laboratory and solve the problem of miniaturization of an array sound wave measuring instrument in the laboratory.
The utility model adopts the following technical scheme:
the utility model provides an array sound wave measurement system of no grooving sound arrester in laboratory, its improvement lies in: the system comprises an array acoustic wave measuring instrument, an acquisition communication system and a portable computer; the array sound wave measuring instrument comprises a transmitting device, a sound insulation device and a receiving device which are sequentially connected together through threads, wherein the shells of the transmitting device, the sound insulation device and the receiving device are all made of polytetrafluoroethylene materials, silicone oil is filled in the shells of the transmitting device, the sound insulation device and the receiving device, the transmitting device comprises a monopole transmitting transducer and a dipole transmitting transducer, and the receiving device comprises 8 receiving transducers; the acquisition communication system comprises a network communication circuit, a power supply circuit, a data acquisition and processing circuit, an acoustic wave transmitting circuit and a receiving preprocessing circuit, wherein the network communication circuit is connected with the portable computer through a communication line for communication, the data acquisition and processing circuit, the acoustic wave transmitting circuit and the receiving preprocessing circuit are electrically connected with the network communication circuit, the data acquisition and processing circuit is electrically connected with the acoustic wave transmitting circuit and the receiving preprocessing circuit, the acoustic wave transmitting circuit is electrically connected with a transmitting device of the array acoustic wave measuring instrument, the receiving preprocessing circuit is electrically connected with a receiving device of the array acoustic wave measuring instrument, and the power supply circuit supplies power for the array acoustic wave measuring instrument and the acquisition communication system.
Furthermore, rubber rings with certain thickness are arranged at the threaded connection positions of the transmitting device, the sound insulation device and the receiving device.
Furthermore, the sound insulation device is 30cm in section, and the specific number of connected sections is set according to the critical source distance of sound velocity measurement, so that the length of the sound insulation device is larger than the critical source distance of sound velocity measurement.
Further, the inner diameters of the transmitting device and the receiving device at the positions of the monopole transmitting transducer, the dipole transmitting transducer and the receiving transducer are larger than those of the rest positions and the sound insulation device.
Further, the communication line is a USB or Ethernet communication line.
The array sound wave measuring system disclosed by the utility model has the beneficial effects that:
(1) compared with the existing array acoustic logging instrument, the length of the array acoustic logging instrument is 1/10-1/8 of the existing instrument, the outer diameter of the array acoustic logging instrument is 1/3-1/2 of the existing instrument, the miniaturization degree of the instrument is higher, and the time difference curves of the longitudinal wave, the transverse wave and the Stoneley wave obtained by measurement are comparable to the results of an actual field instrument measurement model.
(2) Through designing a simple structure, reasonable in design, sound insulation is effectual and have the sound arrester of certain degree tensile and compressive strength, realize the miniaturization of array sound wave measurement system in the laboratory. The sound insulation device is free of notches, polytetrafluoroethylene materials are used for replacing a traditional stainless steel-rubber ring structure to achieve effective sound insulation, and notches are omitted, so that the processing difficulty of an instrument shell and the manufacturing cost of an instrument can be reduced.
(3) The transmitting device, the sound insulation device and the receiving device are connected through threads, and the combination of the modes can increase the length of the source distance by increasing the number of the sound insulation device, so that the sound insulation device is suitable for borehole measuring environments with different sizes, and the adaptability of the instrument is enhanced.
(4) The device can be used as an instrument support for researching logging response under complex geological conditions, and has the advantages of small occupied area, convenience in operation, and accurate and reliable measurement result precision;
(5) the method has the advantages of repeatability and the like, and can be used for analyzing single-factor geological conditions and complex multi-factor geological conditions.
Drawings
Fig. 1 is a schematic structural diagram of an array acoustic wave measurement system disclosed in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an array acoustic wave measuring instrument in the array acoustic wave measuring system disclosed in embodiment 1 of the present invention;
FIG. 3(a) is a diagram of a received waveform for a polytetrafluoroethylene housing;
FIG. 3(b) is a waveform of a reception of a conventional glass fiber reinforced plastic/steel housing;
FIG. 4(a) is a snapshot of the wavefield of the Teflon shell;
figure 4(b) is a snapshot of the wavefield for a conventional glass reinforced plastic/steel hull.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Embodiment 1, as shown in fig. 1, this embodiment discloses an array acoustic wave measurement system of a sound insulation device without a notch in a laboratory, which includes an array acoustic wave measurement instrument 1, an acquisition communication system 2 and a portable computer 3, where a depth part of the system is a depth transmission module, which can perform fixed-point measurement and dynamic measurement, depth information is introduced into the acquisition communication system, and the acquisition communication system completes functions of data acquisition, data transmission, power adjustment, state conversion, communication with the portable computer, instrument reset, and the like.
The working process of the acquisition communication system is as follows: when the array sound wave measuring system starts to work, firstly, the portable computer issues an instruction, the data acquisition and processing circuit performs parameter configuration and other work according to the instruction of the portable computer, then, according to the parameter configuration, the sound wave transmitting circuit is controlled under the instruction of the portable computer to transmit sound waves, the receiving and preprocessing circuit performs preprocessing on the received sound wave signals and then performs acquisition and storage on the sound wave signals, and finally, the acquired sound wave data are uploaded under the instruction control of the portable computer.
As shown in fig. 2, the array acoustic wave measuring instrument comprises a transmitting device 11, a sound insulation device 12 and a receiving device 13 which are sequentially connected together through threads, and a rubber ring with a certain thickness is arranged at the threaded connection position for sealing and sound insulation. The shells 14 of the transmitting device, the sound insulation device and the receiving device are all made of polytetrafluoroethylene materials, grooving is not needed, and the insides of the transmitting device, the sound insulation device and the receiving device are filled with silicon oil.
The sound transmission properties of the polytetrafluoroethylene shell and the traditional rubber capsule shell were compared as follows:
assuming that the adjacent media on both sides of a certain medium are different, such as oil, rubber and water, and three media, there are two layers of interfaces between the media, the calculation formula of the sound transmission coefficient (sound intensity transmittance) is:
in the formula (1), the first and second groups,
，
，
respectively the impedance of three media, and
，
，
the wavelength and thickness of the interlayer dielectric.
The acoustic transducer transmitting frequency was selected to be 35kHz (the conventional transmitting main frequency of the small diameter transducer), and the acoustic transmission coefficients were calculated according to the formula (1) with the remaining parameters as shown in the following table.
In the case of three media, silicone oil, polytetrafluoroethylene and water respectively, from inside to outside (with the well axis as the center), the calculated sound transmission coefficient is T1= 0.9785.
In the case of three media, silicone oil, rubber capsule and water respectively, from inside to outside (with the well axis as the center), the calculated sound transmission coefficient is T2= 0.9420.
It can be concluded by comparison that the sound transmission properties of the teflon outer shell are still better than those of the conventional rubber capsule outer shell, despite the increased thickness.
The sound insulation aims at blocking sound waves transmitted along the instrument and ensuring that the first wave received by the receiver comes from an underground stratum, polytetrafluoroethylene is used as an instrument shell in the embodiment, the sound velocity of the material is usually between 1300 and 1450m/s, is far lower than the longitudinal wave velocity of a conventional stratum (the reference range is 1800-7000 m/s) and is also lower than the sound velocity of fluid in the well (the reference range is 1500-1650 m/s), so that the sound wave transmitted along the instrument reaches the receiver later in time than the sound wave transmitted along the fluid in the well, and the sound insulation aim can be achieved by adopting the material shell without other processing.
The received waveform using teflon case is shown in fig. 3(a), the received waveform using conventional glass fiber reinforced plastic/steel case is shown in fig. 3(b), the wavefield snapshot for teflon case is shown in fig. 4(a), and the wavefield snapshot for conventional glass fiber reinforced plastic/steel case is shown in fig. 4 (b). It can be concluded through comparison that when a teflon shell is adopted, no special treatment is needed, the first wave received by the receiver is the longitudinal wave propagating along the stratum (in this example, the first wave reaches the receiver 1 after 0.15 ms), and when a traditional glass fiber reinforced plastic/steel shell is adopted, under the condition of the same shell processing shape, the first wave received by the receiver is the instrument wave from the instrument (in this example, the first wave reaches the receiver 1 after 0.1 ms), the time is greatly advanced, and the stratum longitudinal wave speed cannot be measured.
The transmitting device comprises a monopole transmitting transducer 111 and a dipole transmitting transducer 112, the receiving device comprises 8 receiving transducers 131, and the inner diameters of the transmitting device and the receiving device at the positions of the monopole transmitting transducer, the dipole transmitting transducer and the receiving transducer are larger than those of the rest positions and the sound insulation device; the acquisition communication system comprises a network communication circuit, a power supply circuit, a data acquisition and processing circuit, an acoustic wave transmitting circuit and a receiving preprocessing circuit, wherein the network communication circuit is connected with the portable computer through a USB or Ethernet communication line for communication, the data acquisition and processing circuit, the acoustic wave transmitting circuit and the receiving preprocessing circuit are electrically connected with the network communication circuit, the data acquisition and processing circuit is electrically connected with the acoustic wave transmitting circuit and the receiving preprocessing circuit, the acoustic wave transmitting circuit is electrically connected with a transmitting device of the array acoustic wave measuring instrument, the receiving preprocessing circuit is electrically connected with a receiving device of the array acoustic wave measuring instrument, and the power supply circuit supplies power for the array acoustic wave measuring instrument and the acquisition communication system.
The transmitting device, the receiving device and the sound insulation device of the array sound wave measuring instrument are not integrated, but are spliced by threads, the purpose of adjusting the source distance can be realized by increasing the number of sections of the sound insulation device, and the array sound wave measuring instrument is used for meeting the measuring environments under different borehole conditions.
In actual logging, the source distance of the array acoustic wave measuring instrument can be obtained by calculation according to the longitudinal wave velocity of the stratum, the fluid velocity in the well and the distance between the instrument and the well wall, and the condition that the waveform head wave acquired when the monopole transmitting transducer is excited is the longitudinal wave information of the stratum is met, namely the source distance condition must be met:
wherein the content of the first and second substances,TRthe source-to-source distance is represented,athe distance from the transducer to the borehole wall is indicated,VpandVfrepresenting the planing longitudinal wave velocity and the fluid velocity, respectively.
Example 1: the inner diameter of the sleeve is 0.04m, and the outer diameter of the instrument is 0.035 m.
According to the conventional stratum longitudinal wave velocity range of 1800-7000 m/s and the well fluid velocity range of 1500-1600m/s, the critical source distance TR which ensures that stratum sliding longitudinal waves arrive first can be calculated according to the formula (2) as follows:
if the longitudinal wave speed is 1800m/s and the fluid speed is 1500m/s, TR =0.0166m
If the longitudinal wave speed is 1800m/s and the fluid speed is 1600m/s, TR =0.0206m
If the longitudinal wave velocity is 7000m/s and the fluid velocity is 1500m/s, then TR =0.0062m
If the longitudinal wave velocity is 7000m/s and the fluid velocity is 1600m/s, then TR =0.0063m
Thus, it can be seen that: in the case of a cannula with an inner diameter of 0.04m and an instrument with an outer diameter of 0.035m, the minimum source distance should be 21cm (greater than the maximum critical source distance calculated in the above speed range).
Example 2: the inner diameter of the sleeve is 0.05m, and the outer diameter of the instrument is 0.035 m.
According to the conventional stratum longitudinal wave velocity range of 1800-7000 m/s and the well fluid velocity range of 1500-1600m/s, the critical source distance TR which ensures that stratum sliding longitudinal waves arrive first can be calculated according to the formula (2) as follows:
if the longitudinal wave velocity is 1800m/s and the fluid velocity is 1500m/s, TR =0.05m
If the longitudinal wave speed is 1800m/s and the fluid speed is 1600m/s, TR =0.06m
If the longitudinal wave speed is 7000m/s and the fluid speed is 1500m/s, then TR =0.0186m
If the longitudinal wave velocity is 7000m/s and the fluid velocity is 1600m/s, TR =0.0189m
It can be seen that the minimum source distance is 60cm when the inner diameter of the cannula is 0.05m and the outer diameter of the instrument is 0.035 m.
The sound insulation device in the embodiment has a section of 30cm, so that the measurement requirement in a small borehole (example 1) in a laboratory is completely met, when the sound insulation device is used in other borehole environments, the source distance of the sound measurement instrument can be ensured to meet the requirement of the critical source distance of sound velocity measurement by increasing the section number of the sound insulation device, other parts of the array sound wave measurement instrument do not need to be changed, and the adaptability of the array sound wave measurement instrument to different boreholes is greatly improved.
Claims (5)
1. The utility model provides an array sound wave measurement system of no grooving sound arrester in laboratory which characterized in that: the system comprises an array acoustic wave measuring instrument, an acquisition communication system and a portable computer; the array sound wave measuring instrument comprises a transmitting device, a sound insulation device and a receiving device which are sequentially connected together through threads, wherein the shells of the transmitting device, the sound insulation device and the receiving device are all made of polytetrafluoroethylene materials, silicone oil is filled in the shells of the transmitting device, the sound insulation device and the receiving device, the transmitting device comprises a monopole transmitting transducer and a dipole transmitting transducer, and the receiving device comprises 8 receiving transducers; the acquisition communication system comprises a network communication circuit, a power supply circuit, a data acquisition and processing circuit, an acoustic wave transmitting circuit and a receiving preprocessing circuit, wherein the network communication circuit is connected with the portable computer through a communication line for communication, the data acquisition and processing circuit, the acoustic wave transmitting circuit and the receiving preprocessing circuit are electrically connected with the network communication circuit, the data acquisition and processing circuit is electrically connected with the acoustic wave transmitting circuit and the receiving preprocessing circuit, the acoustic wave transmitting circuit is electrically connected with a transmitting device of the array acoustic wave measuring instrument, the receiving preprocessing circuit is electrically connected with a receiving device of the array acoustic wave measuring instrument, and the power supply circuit supplies power for the array acoustic wave measuring instrument and the acquisition communication system.
2. The array acoustic measurement system of the sound insulation device without the notch in the laboratory according to claim 1, characterized in that: and rubber rings with certain thickness are arranged at the threaded connection positions of the transmitting device, the sound insulation device and the receiving device.
3. The array acoustic measurement system of the sound insulation device without the notch in the laboratory according to claim 1, characterized in that: the sound insulation device is 30cm in section, and the specific number of connected sections is set according to the critical source distance of sound velocity measurement, so that the length of the sound insulation device is larger than the critical source distance of sound velocity measurement.
4. The array acoustic measurement system of the sound insulation device without the notch in the laboratory according to claim 1, characterized in that: the inner diameters of the transmitting device and the receiving device at the positions of the monopole transmitting transducer, the dipole transmitting transducer and the receiving transducer are larger than those of the rest positions and the sound insulation device.
5. The array acoustic wave measurement system of the laboratory grooving-free sound insulating device according to claim 1, wherein: the communication line is a USB or Ethernet communication line.
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| CN202123104487.2U CN216718719U (en) | 2021-12-12 | 2021-12-12 | Array sound wave measuring system of groove-free sound insulation device in laboratory |
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