An acoustic isolation sub for an array sonic logging instrument

Abstract

The application relates to a sound insulation nipple of an array acoustic logging instrument. The sound insulation nipple comprises a sound insulation middle component and two sound insulation end components respectively arranged at two ends of the sound insulation middle component, wherein the sound insulation end component comprises a sound insulation joint, a first sound insulation shell and a sound insulation shell joint, one end of the first sound insulation shell is sleeved with one end of the sound insulation joint, and the other end of the first sound insulation shell is fixedly connected with one end of the sound insulation shell joint; the sound insulation middle component comprises a sound insulation inner shaft and a second sound insulation shell, two second sound insulation shells are oppositely sleeved with two ends of the sound insulation inner shaft, and the other ends of the two second sound insulation shells, which are away from the sound insulation inner shaft, are fixedly connected with the other ends of the two sound insulation shell joints. The sound insulation nipple effectively prolongs the time of the body signal transmission, reduces the amplitude of the body signal, and further improves the measurement accuracy of the logging instrument through the special assembly structure and the material selection among the parts.

Description

Technical Field

[0001] This invention belongs to the field of well logging equipment technology, and in particular relates to a sound-insulating short section for an array acoustic logging instrument. Background Technology

[0002] Sonic logging is a logging method that studies the geological characteristics of the formation and the wellbore engineering condition by measuring the acoustic properties of the wellbore medium. It has wide applications in many fields such as oilfield exploration and development, and geophysical engineering. The basic principle of sonic logging is that sound waves propagate at significantly different speeds in different media, and their acoustic characteristics, such as amplitude attenuation and frequency changes, also differ. Modern logging technology estimates the properties of the formation outside the well, such as formation thickness, porosity, oil saturation, water saturation, gas saturation, and permeability, by measuring these acoustic parameters in the formation and wellbore, combined with other logging methods such as electrical and radiometric methods. Furthermore, sonic logging data can be used to analyze formation stress, detect formation fractures, inspect the cement bonding state in casing wells, and evaluate cementing quality, among other things.

[0003] There are many different types of instruments used in acoustic logging, but they all share the common characteristic of being able to emit and receive sound waves. Different instruments emit and receive different types of sound waves, thereby achieving different detection purposes. Modern acoustic logging technology has developed rapidly, and the commonly used acoustic logging methods currently include: acoustic velocity logging, acoustic amplitude logging, long-spacing acoustic full-wavelength logging, and acoustic imaging logging.

[0004] In recent years, with the deepening of geological and petroleum exploration, the expectations and requirements for logging instruments have become increasingly higher. Acoustic logging is one of the important methods of petroleum logging. The currently used acoustic logging technology uses a transmitting transducer to emit sound waves downhole, which propagate in the underground medium. After a certain period of attenuation, the sound waves are received by a receiving transducer. By analyzing the attenuated sound wave signal, the relevant underground geological structure can be determined.

[0005] A sound-insulating section is placed between the transmitter and receiver of an acoustic instrument. Acoustic instruments are primarily used to detect geological formations. The instrument transmits a signal via a transmitting crystal, which travels through the formation and is then received by a receiving crystal. Ideally, this signal would only be transmitted from the formation. However, since the instrument cannot be completely disconnected, a connection is necessary between the transmitter and receiver. This connection transmits the signal from the transmitting crystal to the receiving crystal, resulting in the received signal no longer being solely the formation signal. The signal transmitted through the instrument connection is called the instrument's core signal, while the signal transmitted through the formation is called the formation signal. When these two signals overlap, the measured data becomes inaccurate. The sound-insulating section is designed to extend the arrival time of the core signal and minimize its amplitude through mechanical design, thereby reducing the influence of the core signal on the formation signal and improving the instrument's measurement accuracy.

[0006] The structure of the acoustic insulation short section not only affects the measurement accuracy of the instrument, but also has a significant impact on its strength, especially for small-sized instruments. Traditional grooved structures in the acoustic insulation shell cannot meet the strength requirements of the instrument. Insufficient instrument strength leads to excessive bending during logging, especially in horizontal wells, resulting in poor instrument centering, causing problems in data calculation, and even friction against the well wall, resulting in a lot of noise in the received signal. All of these factors can lead to inaccurate measurements, so structural design improvements are necessary. Summary of the Invention

[0007] In view of the problems existing in the prior art, the present invention provides an array acoustic logging instrument sound insulation short section, which can effectively solve or alleviate one or more of the above-mentioned problems and other problems existing in the prior art.

[0008] This invention provides a sound-insulating short section for an array acoustic logging instrument, disposed between the acoustic receiver and the acoustic transmitter of the instrument. The sound-insulating short section comprises a sound-insulating central assembly and two sound-insulating end assemblies respectively disposed at both ends of the central assembly. The central assembly and the end assemblies are connected at their axial centers.

[0009] The sound insulation end assembly includes:

[0010] Soundproof connector;

[0011] A first soundproof housing, one end of which is fitted onto one end of the soundproof joint;

[0012] A soundproof housing connector, one end of which is fixedly connected to the other end of the first soundproof housing;

[0013] The sound insulation central component includes:

[0014] Soundproof inner shaft;

[0015] Two second soundproof shells are fitted onto the two ends of the soundproof inner shaft, and the ends of the two second soundproof shells away from the soundproof inner shaft are respectively fixedly connected to the other ends of the two soundproof shell joints.

[0016] Preferably, the soundproof joint includes a head, a middle section, and a tail section with successively decreasing circumferential diameters. The head of the soundproof joint has a plurality of first connecting holes evenly distributed circumferentially. The outer wall of the middle section of the soundproof joint has a plurality of first outer grooves distributed circumferentially at different axial positions. The inner wall of the middle section of the soundproof joint has a plurality of first inner grooves distributed circumferentially at different axial positions. The outer wall of the tail section of the soundproof joint has a plurality of first sealing grooves distributed circumferentially at different axial positions. A plug is provided in the first outer groove. A rubber ring is provided in the first sealing groove. The outer wall of the tail section of the soundproof joint has a raised first threaded portion distributed circumferentially. The tail section of the soundproof joint has a first anti-rotation head that extends outward axially.

[0017] One end of the first soundproof shell is fitted onto the middle and tail of the soundproof joint. Multiple second sealing grooves are provided circumferentially at different axial positions on the inner wall of one end of the first soundproof shell. The multiple second sealing grooves are respectively provided with multiple first sealing grooves. Each of the second sealing grooves is provided with a rubber ring. A first sealing sleeve is provided between the first sealing groove and the second sealing groove to fill the gap between the first soundproof shell and the soundproof joint. Multiple second connecting holes are uniformly provided circumferentially at the other end of the first soundproof shell.

[0018] The sound insulation end assembly also includes:

[0019] A first locking ring is threadedly connected to the first threaded portion, such that one end of the first soundproof housing abuts against the head of the soundproof joint. A plurality of staggered baffles, a plurality of long baffles, and a plurality of short baffles are fitted between one end of the first soundproof housing and the head of the soundproof joint. A first gasket, a second gasket, a third gasket, and a fourth gasket are sequentially fitted between one end of the first locking ring and the first soundproof housing. A first isolation sleeve is also provided between the first gasket, the second gasket, the third gasket, the fourth gasket, and the soundproof joint. A first mounting groove is provided circumferentially on the outer wall of the first locking ring, and a first support ring is provided in the first mounting groove.

[0020] A first anti-rotation connector is disposed between the sound insulation connector and the sound insulation shell connector. One end of the first anti-rotation connector is provided with a first anti-rotation groove that matches the first anti-rotation head along the axial direction inward. The first anti-rotation head is inserted into the first anti-rotation groove. The other end of the first anti-rotation connector is provided with a second anti-rotation head that extends outward along the axial direction.

[0021] One end of the soundproof shell connector has a plurality of third connecting holes evenly distributed circumferentially, corresponding to the plurality of second connecting holes respectively. Each second connecting hole and the corresponding third connecting hole is provided with a connecting post. The connecting post fixes the soundproof shell connector and the first soundproof shell to each other by screws and washers. One end of the soundproof shell connector has a second anti-rotation groove that matches the second anti-rotation head, which is inserted into the second anti-rotation groove. Both ends of the soundproof shell connector have a third sealing groove distributed circumferentially on their outer walls. The third sealing groove contains a rubber ring. The middle outer wall of the soundproof shell connector has a plurality of second outer grooves distributed circumferentially at different axial positions. The second outer groove contains a plug. The middle inner wall of the soundproof shell connector has a plurality of second inner grooves distributed circumferentially at different axial positions. The other end of the soundproof shell connector has a plurality of fourth connecting holes evenly distributed circumferentially. The other end of the soundproof shell connector has a third anti-rotation groove distributed axially inward.

[0022] Preferably, each of the two second soundproof shells has a plurality of fifth connecting holes evenly provided circumferentially at the ends away from the inner axis of the soundproof shell, which correspond to the plurality of fourth connecting holes respectively. Each fourth connecting hole and the corresponding fifth connecting hole is provided with a connecting post. The connecting post fixes the two second soundproof shells to the corresponding soundproof shell joints respectively by screws and washers.

[0023] A second threaded portion is provided on the outer wall of one end of the sound-insulating inner shaft along the circumferential direction, and a support portion is provided on the other end of the sound-insulating inner shaft along the circumferential direction. Both ends of the sound-insulating inner shaft are provided with a third anti-rotation head extending outward along the axial direction.

[0024] The sound insulation central component also includes:

[0025] Two outer shell blocks are fitted onto the middle of the inner sound insulation shaft. The two outer shell blocks are located between the two second sound insulation shells. A fourth sealing groove is provided circumferentially at the connection of the two outer shell blocks. A baffle is provided in the fourth sealing groove. A baffle is provided between each outer shell block and the corresponding second sound insulation shell.

[0026] The second locking ring is threadedly connected to the second threaded part, so that both second soundproof shells and both shell blocks abut against the support part. A fifth gasket, a sixth gasket, a seventh gasket, and an eighth gasket are sequentially fitted between one end of the second locking ring and one of the second soundproof shells. A second isolation sleeve is also provided between the fifth gasket, the sixth gasket, the seventh gasket, and the eighth gasket and the soundproof inner shaft. A second mounting groove is opened circumferentially on the outer wall of the second locking ring. A second support ring is provided in the second mounting groove. A ninth gasket, a tenth gasket, an eleventh gasket, and a twelfth gasket are sequentially fitted between one end of the support part and another of the second soundproof shells. A third isolation sleeve is also provided between the ninth gasket, the tenth gasket, the eleventh gasket, and the twelfth gasket and the soundproof inner shaft. A third mounting groove is opened circumferentially on the support part. A third support ring is provided in the third mounting groove.

[0027] Two second anti-rotation joints are respectively disposed between the inner sound insulation shaft and the two outer sound insulation shell joints. One end of each second anti-rotation joint is provided with a fourth anti-rotation groove that matches the third anti-rotation head along the axial direction inward. The third anti-rotation head is inserted into the corresponding fourth anti-rotation groove. The other end of each anti-rotation joint is provided with a fourth anti-rotation head that matches the third anti-rotation groove along the axial direction inward. The fourth anti-rotation head is inserted into the corresponding third anti-rotation groove.

[0028] A second sealing sleeve is provided in the middle of the sound-insulating inner shaft. The second sealing sleeve is used to fill the gaps between the sound-insulating inner shaft and the two outer shell blocks, and between the sound-insulating inner shaft and the two second sound-insulating outer shells.

[0029] Preferably, the soundproof joint, the first soundproof shell, and the second soundproof shell are made of 17-4PH steel.

[0030] Preferably, the soundproof housing connector is made of TC11 titanium alloy.

[0031] Preferably, the sound-insulating inner shaft is made of beryllium bronze.

[0032] Preferably, the first anti-transformer, the second anti-transformer, the first sealing sleeve, the second sealing sleeve, the long stop, the short stop, and the outer shell stop are all made of PEEK material.

[0033] Preferably, the baffle is made of metal.

[0034] Preferably, both the first support ring and the second support ring are made of polytetrafluoroethylene (PTFE).

[0035] Preferably, the first gasket, the second gasket, the third gasket, and the fourth gasket are made of metal, rubber, polytetrafluoroethylene (PTFE), and PEEK, respectively; the fifth gasket, the sixth gasket, the seventh gasket, and the eighth gasket are made of metal, rubber, PTFE, and PEEK, respectively; and the ninth gasket, the tenth gasket, the eleventh gasket, and the twelfth gasket are made of metal, rubber, PTFE, and PEEK, respectively.

[0036] The beneficial effects of this invention are:

[0037] This invention provides a sound-insulating short section for an array acoustic logging instrument. Through the special assembly structure and material selection between the various parts, it effectively extends the signal transmission time of the main body and reduces the amplitude of the main body signal, thereby improving the measurement accuracy of the logging instrument. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0039] Figure 1 This is a schematic diagram illustrating the use of an array acoustic logging instrument according to an embodiment of the present invention;

[0040] Figure 2 This is a three-dimensional structural diagram of an array acoustic logging instrument according to an embodiment of the present invention;

[0041] Figure 3 This is a three-dimensional structural diagram of a sound-insulating short section of an array acoustic logging instrument according to an embodiment of the present invention;

[0042] Figure 4 for Figure 3 A sectional view;

[0043] Figure 5 for Figure 3 Structural cross-sectional view of the end component of the central sound insulation system;

[0044] Figure 6 for Figure 5 Schematic diagram of the sound insulation joint;

[0045] Figure 7 for Figure 5 Schematic diagram of the structure of the first soundproof shell;

[0046] Figure 8 for Figure 5 A schematic diagram of the structure of the first locking ring;

[0047] Figure 9 for Figure 5 Schematic diagram of the first anti-transfer connector in China;

[0048] Figure 10 for Figure 5 Schematic diagram of the structure of the sound insulation shell joint

[0049] Figure 11 for Figure 3 Structural cross-sectional view of the central component of the sound insulation system;

[0050] Figure 12 for Figure 11 A schematic diagram of the inner shaft of the sound insulation system.

[0051] Explanation of reference numerals in the attached drawings: 11-Complete acoustic probe; 12-Acoustic receiver; 13-Acoustic transmitter 1313; 21-Acoustic insulation short section; 31-Insulation end assembly; 32-Insulation middle assembly; 33-Sealing tube; 34-Filling rod; 35-Screw; 36-Washer; 37-Connecting post; 41-Insulation joint; 42-First insulation shell; 43-Insulation shell joint; 44-First locking ring; 45-First anti-rotation joint; 46-Plug; 47-Baffle; 48-Long stop; 49-Short stop; 410-First sealing sleeve; 411-First support ring; 412-First gasket; 413-Second gasket; 414-Third gasket; 415-Fourth gasket; 416-First isolation sleeve; 417-First connecting hole; 418-First outer groove; 419-First inner groove; 420-First sealing groove; 421-First threaded part; 422-First anti-rotation head; 423-Second sealing groove; 424-Second connecting hole; 425 426-First mounting groove; 427-Second anti-rotation groove; 428-Third connecting hole; 429-Fourth connecting hole; 430-Second anti-rotation groove; 431-Third anti-rotation groove; 432-Third sealing groove; 433-Second outer groove; 434-Second inner groove; 51-Second soundproof outer shell; 52-Soundproof inner shaft; 53-Outer shell stop; 54-Second locking ring; 55-Second anti-rotation joint; 56-Fifth connecting hole; 57-Fourth sealing groove; 58-Second sealing sleeve; 59-Second support ring; 510-Second isolation sleeve; 511-Third support ring; 512-Third isolation sleeve; 513-Fifth gasket; 514-Sixth gasket; 515-Seventh gasket; 516-Eighth gasket; 517-Ninth gasket; 518-Tenth gasket; 519-Eleventh gasket; 520-Twelfth gasket; 521-Second threaded part; 522-Third anti-rotation head; 523-Support part; 524-Third mounting groove. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only 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.

[0053] This invention provides a sound-insulating short section for an array acoustic logging instrument, which can effectively solve or alleviate the drawbacks and shortcomings of the prior art, including those described above.

[0054] This invention provides a sound-insulating short section for an array acoustic logging instrument. Figure 1 This is a schematic diagram illustrating the use of an array acoustic logging instrument according to an embodiment of the present invention. Figure 1 This paper briefly explains the principle of acoustic logging and the role and function of this invention in acoustic logging. During acoustic logging, the acoustic transmitter 13 on the acoustic probe assembly 11 emits acoustic signals. These signals propagate through the underground medium, and the various physical characteristics of the formation affect the acoustic signals. After a certain period of attenuation, the signals are received by the acoustic receiver 12. By analyzing the attenuated acoustic signals, the relevant underground geological structures are determined. The acoustic transmitter 13 contains an acoustic generating element, which is an electroacoustic transducer made of piezoelectric ceramics or piezoelectric quartz. Under the action of a pulsed current, the acoustic generating element converts electrical energy into mechanical energy and emits it in the form of sound waves. The acoustic receiver 12 is made of the same material as the acoustic generating element. Because the piezoelectric effect of piezoelectric ceramics, piezoelectric quartz, etc., is reversible, when subjected to mechanical stress, the electric field strength generated between fixed points of the piezoelectric material in the acoustic receiver 12 is proportional to the applied sound pressure, resulting in a voltage output. The phase of the generated electrical signal is the same as the phase of the sound signal, and the amplitude of the electrical signal is proportional to the amplitude of the sound wave.

[0055] Figure 2 This is a three-dimensional structural diagram of an array acoustic logging instrument according to an embodiment of the present invention. The connection between the acoustic transmitter 13 and the acoustic receiver 12 is the sound insulation section 21 of the acoustic logging instrument according to the embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of a sound-insulating short section of an array acoustic logging instrument according to an embodiment of the present invention. Figure 4 for Figure 3 The sectional view, combined with Figure 3-4As shown, the soundproof short section 21 of the array acoustic logging instrument includes a soundproof middle component 32 and two soundproof end components 31 respectively located at both ends of the soundproof middle component 32. The soundproof middle component 32 and the soundproof end components 31 are connected through the axis. Filler rods 34 and sealing tubes 33 are inserted into both ends of the soundproof short section 21. The sealing tube 33 is inserted into the central cavity of the acoustic transmitter 13 or the acoustic receiver 12, connecting the central cavity of the acoustic transmitter 13 or the acoustic receiver 12 with the central cavity of the soundproof short section 21, and at the same time serving as a connection and sealing function. The filler rod 34 is made of non-metallic material and serves to limit the axial displacement of the sealing tube 33. The central cavity of the entire array acoustic logging instrument serves as the wiring between the acoustic transmitter 13 and the acoustic receiver 12 and to balance the internal and external pressures.

[0056] Figure 5 for Figure 3 A structural cross-sectional view of the sound insulation end component 31, combined with... Figure 5 As shown, the sound insulation end assembly 31 includes a sound insulation connector 41, a first sound insulation shell 42, and a sound insulation shell connector 43. One end of the first sound insulation shell 42 is sleeved on one end of the sound insulation connector 41, and one end of the sound insulation shell connector 43 is fixedly connected to the other end of the first sound insulation shell 42.

[0057] Figure 11 for Figure 3 A structural cross-sectional view of the central sound insulation component 32, combined with... Figure 11 As shown, the sound insulation middle component 32 includes a sound insulation inner shaft 52 and two second sound insulation shells 51. The two second sound insulation shells 51 are sleeved on opposite ends of the sound insulation inner shaft 52. The ends of the two second sound insulation shells 51 that are away from the sound insulation inner shaft 52 are respectively fixedly connected to the other ends of the two sound insulation shell joints 43.

[0058] The acoustic isolation section of the array acoustic logging instrument in this embodiment of the invention greatly improves the strength and performance of the acoustic logging instrument through improvements in the structure, materials, and connection relationships of each component.

[0059] Figure 6 for Figure 5 The structural diagram of the sound insulation joint 41 shows that, based on actual needs such as strength and corrosion resistance, the sound insulation joint 41 can be made of 17-4PH steel, or other suitable metal materials. Figure 5 and Figure 6 As shown, the soundproof connector 41 includes a head, a middle part and a tail with successively decreasing circumferential diameters. The head of the soundproof connector 41 is provided with a plurality of first connection holes 417 evenly distributed along the circumference. The number of first connection holes 417 is preferably four. The first connection holes 417 are used to connect to the sound wave transmitter 13 or the sound wave receiver 12.

[0060] Combination Figure 5 and Figure 6 Multiple first outer grooves 418 are circumferentially formed at different axial positions on the outer wall of the middle part of the sound insulation joint 41. The number of first outer grooves 418 is determined by the length of the sound insulation joint 41. The increase in the inner and outer interfaces of the entire sound insulation joint and the change in material can both play the role of attenuating sound wave signals. In this embodiment, there are two first outer grooves 418, which serve to attenuate sound wave signals. A plug 46 is provided inside the first outer groove 418. The plug 46 can be made of polytetrafluoroethylene (PTFE). The first outer groove 418 is used to attenuate sound wave signals, and the plug 46 is used to fill the first outer groove 418 to increase rigidity. The use of PTFE material meets the strength requirements while also providing better sound insulation performance.

[0061] Combination Figure 5 and Figure 6 Multiple first inner grooves 419 are provided circumferentially at different axial positions on the inner wall of the sound insulation joint 41. The number of first inner grooves 419 is determined by the length of the sound insulation joint 41. In this embodiment, there are two first inner grooves 419. The first inner grooves 419 also serve to attenuate sound wave signals.

[0062] Combination Figure 5 and Figure 6 Multiple first sealing grooves 420 are provided circumferentially at different axial positions on the outer wall of the tail of the soundproof joint 41. A rubber ring is provided inside the first sealing groove 420. The tail of the soundproof joint 41 contacts the inner wall of the first soundproof shell 42. To prevent external mud from entering the central cavity of the soundproof short section 21 through the gap between the soundproof joint 41 and the first soundproof shell 42 during use, multiple first sealing grooves 420 are provided and rubber rings are fitted inside the sealing grooves to improve the sealing performance of the device.

[0063] Combination Figure 5 and Figure 6 The soundproof connector 41 has a raised first threaded portion 421 on its outer wall at the tail end along the circumferential direction, and a first anti-rotation head 422 is provided on the tail end of the soundproof connector 41 extending outward along the axial direction. The first threaded portion 421 is used to connect the soundproof connector 41 to the first soundproof housing 42, and the first anti-rotation head 422 can cooperate with subsequent parts to prevent the parts from rotating circumferentially.

[0064] Figure 7 for Figure 5 The structural schematic diagram of the first soundproof outer shell 42 shows that, based on actual needs such as strength and corrosion resistance, the first soundproof outer shell 42 can be made of 17-4PH steel. Combined with... Figure 5 and Figure 7As shown, one end of the first soundproof shell 42 is fitted onto the middle and tail of the soundproof joint 41. Multiple second sealing grooves 423 are circumferentially formed at different axial positions on the inner wall of one end of the first soundproof shell 42. These second sealing grooves 423 correspond to multiple first sealing grooves 420. Each second sealing groove 423 contains a rubber ring. A first sealing sleeve 410 is provided between the first sealing grooves 420 and 423 to fill the gap between the first soundproof shell 42 and the soundproof joint 41. The positions of the second sealing grooves 423 correspond to the positions of the first sealing grooves 420. The rubber rings in both the first and second sealing grooves 420 and 423 are in contact with the first sealing sleeve 410. The first sealing sleeve 410 can be made of PEEK material. The elastic rubber rings press against the first sealing sleeve 410, increasing the sealing effect. The first sealing sleeve 410 also prevents direct contact between the metal soundproof joint 41 and the first soundproof shell 42, thereby preventing sound wave signals from being directly transmitted from the contact point.

[0065] Combination Figure 5 and Figure 7 As shown, a plurality of second connection holes 424 are evenly provided circumferentially at the other end of the first soundproof housing 42. The second connection holes 424 are used for radial connection between the first soundproof housing 42 and the soundproof housing joint 43.

[0066] In this embodiment of the invention, the sound insulation end assembly 31 further includes a first locking ring 44 and a first anti-rotation joint 45.

[0067] Figure 8 for Figure 5 A schematic diagram of the structure of the first locking ring 44. (Combined with...) Figure 5 and Figure 8 As shown, the first locking ring 44 is threadedly connected to the first threaded part 421, so that one end of the first soundproof housing 42 abuts against the head of the soundproof joint 41 to fix the first soundproof housing 42.

[0068] Depend on Figure 5 As shown, a plurality of staggered baffles 47, a plurality of long baffles 48, and a plurality of short baffles 49 are fitted between one end of the first soundproof housing 42 and the head of the soundproof joint 41. In this embodiment, the arrangement from the soundproof housing toward the first soundproof housing 42 is arranged in sequence as baffle 47, long baffle 48, baffle 47, long baffle 48, baffle 47, and short baffle 49. Of course, in other embodiments, other staggered arrangements can be used, and this invention is not limited thereto. The baffles 47 can be made of copper, and the long baffles 48 and short baffles 49 can be made of PEEK. By using baffles 47 and baffles of different materials to separate one end of the first soundproof housing 42 from the soundproof joint 41, the sound insulation effect of the soundproof short section 21 is effectively improved.

[0069] Depend on Figure 5As shown, a first gasket 412, a second gasket 413, a third gasket 414, and a fourth gasket 415 are sequentially fitted between one end of the first locking ring 44 and the first soundproof housing 42. The first gasket 412, second gasket 413, third gasket 414, and fourth gasket 415 are all fitted onto the soundproof joint 41, separating the first locking ring 44 from the first soundproof housing 42. The four gaskets have different materials and thicknesses, resulting in greater attenuation of sound waves as they propagate through them. The first gasket 412, second gasket 413, third gasket 414, and fourth gasket 415 can be made of metal, rubber, polytetrafluoroethylene (PTFE), and PEEK, respectively. Of course, other arrangements or materials are also possible, and this embodiment of the invention is not limited to these materials.

[0070] Depend on Figure 5 As shown, a first isolation sleeve 416 is provided between the first gasket 412, the second gasket 413, the third gasket 414, the fourth gasket 415 and the sound insulation joint 41 to prevent direct contact between the parts and further improve the sound insulation effect. The first isolation sleeve 416 can be made of PEEK material, or other materials with certain strength and sound wave attenuation can be used.

[0071] Depend on Figure 5 and Figure 8 As shown, a first mounting groove 425 is circumferentially formed on the outer wall of the first locking ring 44, and a first support ring 411 is provided within the first mounting groove 425. The first support ring 411 is located between the first locking ring 44 and the first soundproof housing 42, which can prevent the first locking ring 44 from directly contacting the first soundproof housing 42 when the instrument is bent, thereby preventing the sound wave signal from being directly transmitted from the contact point. The first support ring 411 can be made of polytetrafluoroethylene or other non-metallic materials with good sound insulation properties.

[0072] Figure 9 for Figure 5 The structural diagram of the first anti-adaptor 45 in the middle, combined with Figure 5 and Figure 9 As shown, the first anti-rotation connector 45 is disposed between the sound insulation connector 41 and the sound insulation shell connector 43. One end of the first anti-rotation connector 45 has a first anti-rotation groove 426 that matches the first anti-rotation head 422, which is inserted into the first anti-rotation groove 426. The radial cross-section of the first anti-rotation head 422 is polygonal, which can be quadrilateral. The polygonal structure of the first anti-rotation head 422, inserted into the matching first anti-rotation groove 426, prevents the parts from rotating circumferentially and also serves to prevent axial loosening. Considering the strength and attenuation of the sound wave signal transmitted from here, the first anti-rotation head 422 can be made of PEEK material. Of course, other materials with certain strength and sound wave attenuation effects can also be used.

[0073] The other end of the first anti-rotation connector 45 extends outward along the axial direction and is provided with a second anti-rotation head 427. The second anti-rotation head 427 is used for axial connection with the soundproof shell connector 43.

[0074] Figure 10 for Figure 5 The structural diagram of the sound insulation shell connector 43 shows that, based on actual requirements such as strength and corrosion resistance, the sound insulation shell connector 43 can be made of TC11 titanium alloy. Combined with... Figure 3 , Figure 5 and Figure 10 As shown, one end of the soundproof housing connector 43 has a plurality of third connecting holes 428 evenly distributed circumferentially, corresponding to the plurality of second connecting holes 424 respectively. Each second connecting hole 424 and the corresponding third connecting hole 428 is provided with a connecting post 37. The connecting post 37 fixes the soundproof housing connector 43 and the first soundproof housing 42 together with screws 35 and washers 36. Preferably, there are four second connecting holes 424 and three connecting holes 428. The plurality of connecting posts 37 pass through the first soundproof housing 42 and are fixed to the soundproof housing connector 43 with screws 35 and washers 36, so that one end of the soundproof housing connector 43 is fixedly connected to the other end of the first soundproof housing 42. The soundproof connector 41 has a first connecting hole 417. The connection method between the soundproof connector 41 and the sound wave transmitter 13 or the sound wave receiver 12 is the same as the connection method between the soundproof housing connector 43 and the first soundproof housing 42.

[0075] Combination Figure 5 and Figure 10 As shown, one end of the soundproof housing connector 43 has a second anti-rotation groove 430 that matches the second anti-rotation head 427, and the second anti-rotation head 427 is inserted into the second anti-rotation groove 430. This structure connects the soundproof housing connector 43 to the first anti-rotation connector 45. The structure and material of the second anti-rotation head 427 are the same as those of the first anti-rotation head 422, and it also serves to prevent the parts from rotating circumferentially and displacing axially.

[0076] Combination Figure 5 and Figure 10 As shown, a third sealing groove 432 is provided circumferentially on the outer walls of both ends of the soundproof housing joint 43, and a rubber ring is provided inside the third sealing groove 432. The third sealing groove 432 and the rubber ring prevent external mud from entering the central cavity of the soundproof short section 21 through the gap between the first soundproof housing 42, the second soundproof housing 51 and the soundproof housing joint 43 during use, thereby improving the sealing performance of the device.

[0077] Combination Figure 5 and Figure 10As shown, multiple second outer grooves 433 are circumferentially formed at different axial positions on the outer wall of the soundproof housing connector 43, and a plug 46 is provided inside the second outer groove 433. The number of second outer grooves 433 is determined by the length of the soundproof housing connector 43; in this embodiment, two second outer grooves 433 are provided. The second outer grooves 433 have the same function as the first outer groove 418, which can attenuate sound wave signals, and the plug 46 fills the second outer grooves 433 to increase the rigidity of the device.

[0078] Combination Figure 5 and Figure 10 As shown, multiple second inner grooves 434 are provided circumferentially at different axial positions on the inner wall of the soundproof housing connector 43. The number of second inner grooves 434 is determined by the length of the soundproof housing connector 43. In this embodiment, there are three second inner grooves 434. The second inner grooves 434, like the first inner groove 419, serve to attenuate sound wave signals.

[0079] Combination Figure 5 and Figure 10 As shown, the other end of the soundproof housing connector 43 has a plurality of fourth connecting holes 429 evenly distributed circumferentially, and the other end of the soundproof housing connector 43 has a third anti-rotation groove 431 axially inwardly distributed. The fourth connecting holes 429 are used for radial connection with the second soundproof housing 51. The third anti-rotation groove 431 is used for axial connection with the inner soundproof shaft 52.

[0080] Depend on Figure 11 As shown, the structure and material of the second soundproof shell 51 are the same as those of the first soundproof shell 42. Both second soundproof shells 51 have multiple fifth connecting holes 56 evenly spaced circumferentially at their ends away from the inner soundproof shaft 52, corresponding to the multiple fourth connecting holes 429. Each fourth connecting hole 429 and its corresponding fifth connecting hole 56 contains a connecting post 37. The connecting post 37 securely connects the second soundproof shell 51 and its corresponding soundproof shell connector 43 using screws 35 and washers 36.

[0081] Figure 12 for Figure 11 A schematic diagram of the inner sound insulation shaft 52. To ensure sound wave attenuation, the material of the inner sound insulation shaft 52 must be different from that of the second sound insulation shell 51. The inner sound insulation shaft 52 can be made of beryllium bronze or other metals with good sound insulation properties that are different from the material of the sound insulation shell. Combined with... Figure 11 and Figure 12As shown, a raised second threaded portion 521 is provided circumferentially on the outer wall of one end of the sound-insulating inner shaft 52, and a raised support portion 523 is provided circumferentially on the other end of the sound-insulating inner shaft 52. Both ends of the sound-insulating inner shaft 52 are provided with a third anti-rotation head 522 extending outward along the axial direction. The second threaded portion 521 and the support portion 523 are used for fixing and connecting the two second sound-insulating shells 51, and the third anti-rotation head 522 is used for connecting with the sound-insulating shell connector 43.

[0082] In this embodiment of the invention, the sound insulation middle component 32 further includes two outer shell blocks 53, a second locking ring 54, and two second anti-rotation joints 55.

[0083] Combination Figure 11 As shown, two outer shell blocks 53 are fitted opposite each other in the middle of the sound-insulating inner shaft 52. The two outer shell blocks 53 are located between the two second sound-insulating outer shells 51. A fourth sealing groove 57 is provided circumferentially at the connection between the two outer shell blocks 53. A baffle 47 is provided in the fourth sealing groove 57. A baffle 47 is provided between each outer shell block 53 and the corresponding second sound-insulating outer shell 51. Both outer shell blocks 53 rest on the baffle 47 in the fourth sealing groove 57. The baffle 47 prevents external mud from flowing in and also creates a very small gap between the two outer shell blocks 53, so that the two outer shell blocks 53 do not contact each other. Similarly, there is a baffle 47 between the second sound-insulating outer shell 51 and the outer shell blocks 53, so that the second sound-insulating outer shell 51 and the outer shell blocks 53 do not contact each other. This structure avoids the direct transmission of sound wave signals from the contact point. The baffle 47 can be made of copper metal, and the outer shell baffle 53 can be made of PEEK material. Between the two second sound insulation shells 51, there are baffle 47, outer shell baffle 53, baffle 47, outer shell baffle 53, and baffle 47 in sequence. By arranging different materials, the sound wave signal is effectively attenuated, and the sound insulation effect of the sound insulation section 21 is improved.

[0084] Combination Figure 11As shown, the second locking ring 54 is threadedly connected to the second threaded portion 521, so that both second soundproof housings 51 and both housing blocks 53 abut against the support portion 523. A fifth washer 513, a sixth washer 514, a seventh washer 515, and an eighth washer 516 are sequentially fitted between one end of the second locking ring 54 and one of the second soundproof housings 51. A second isolation sleeve 510 is also provided between the fifth washer 513, the sixth washer 514, the seventh washer 515, and the eighth washer 516 and the soundproof inner shaft 52. The outer wall of the second locking ring 54... A second mounting groove is provided circumferentially, and a second support ring 59 is provided in the second mounting groove. A ninth gasket 517, a tenth gasket 518, an eleventh gasket 519, and a twelfth gasket 520 are sequentially fitted between one end of the support part 523 and another second soundproof shell 51. A third isolation sleeve 512 is also provided between the ninth gasket 517, the tenth gasket 518, the eleventh gasket 519, and the twelfth gasket 520 and the soundproof inner shaft 52. A third mounting groove 524 is provided circumferentially on the support part 523, and a third support ring 511 is provided in the third mounting groove 524.

[0085] Combination Figure 11 As shown, the second locking ring 54 is threadedly connected to the second threaded portion 521, so that the two second soundproof housings 51 and the two housing blocks 53 are all pressed against the support portion 523. This fixes the second soundproof housings 51 and the housing blocks 53.

[0086] Combination Figure 11 As shown, a fifth gasket 513, a sixth gasket 514, a seventh gasket 515, and an eighth gasket 516 are sequentially fitted between one end of the second locking ring 54 and the corresponding second soundproof outer shell 51. The fifth gasket 513, sixth gasket 514, seventh gasket 515, and eighth gasket 516 are all fitted onto the soundproof inner shaft 52, separating the second locking ring 54 from the corresponding second soundproof outer shell 51. The four gaskets have different materials and thicknesses, resulting in greater attenuation of sound waves as they propagate through them. The fifth gasket 513, sixth gasket 514, seventh gasket 515, and eighth gasket 516 can be made of metal, rubber, polytetrafluoroethylene (PTFE), and PEEK, respectively. Of course, other arrangements or materials are also possible, and this embodiment of the invention is not limited to these.

[0087] A second isolation sleeve 510 is provided between the fifth shim 513, the sixth shim 514, the seventh shim 515, the eighth shim 516 and the sound insulation inner shaft 52. The material and function of the second isolation sleeve 510 are the same as those of the first isolation sleeve 416, which can improve the sound insulation effect of the sound insulation short section 21.

[0088] Combination Figure 11As shown, each of the second locking rings 54 has a second mounting groove circumferentially formed on its outer wall, and each second mounting groove contains a second support ring 59. The second support ring 59 is located between the second locking ring 54 and the corresponding second soundproof housing 51, preventing the second locking ring 54 from directly contacting the second soundproof housing 51 when the instrument is bent, thus preventing the sound wave signal from being transmitted directly from the contact point. The second support ring 59 can be made of polytetrafluoroethylene or other non-metallic materials with good sound insulation properties.

[0089] The materials and functions of the ninth gasket 517, tenth gasket 518, eleventh gasket 519, and twelfth gasket 520 are the same as those of the fifth gasket 513, sixth gasket 514, seventh gasket 515, and eighth gasket 516, respectively. The material and function of the third isolation sleeve 512 are the same as those of the first isolation sleeve 416. The material and function of the third support ring 511 are the same as those of the second support ring 59.

[0090] Combination Figure 11 As shown, two second anti-rotation joints 55 are respectively disposed between the sound-insulating inner shaft 52 and the two sound-insulating outer shell joints 43. One end of each second anti-rotation joint 55 has a fourth anti-rotation groove that matches the third anti-rotation head 522, which is inserted into the corresponding fourth anti-rotation groove. The other end of each anti-rotation joint has a fourth anti-rotation head that matches the third anti-rotation groove 431, which is inserted into the corresponding third anti-rotation groove 431. The material and structure of the second anti-rotation joints 55 are the same as those of the first anti-rotation joint 45. The second anti-rotation joints 55 are used to connect the sound-insulating inner shaft 52 and the sound-insulating outer shell joints 43 at both ends of the sound-insulating inner shaft 52, thereby preventing the parts from rotating circumferentially and displacing axially.

[0091] Combination Figure 11 and Figure 12 As shown, a second sealing sleeve 58 is provided in the middle of the sound-insulating inner shaft 52. The second sealing sleeve 58 is used to fill the gaps between the sound-insulating inner shaft 52 and the outer shell block 53, and between the sound-insulating inner shaft 52 and the second sound-insulating outer shell 51. The second sealing sleeve 58 prevents external mud from flowing into the central cavity of the sound-insulating short section 21 through the gaps between the two outer shell blocks 53 or the gaps between the second sound-insulating outer shell 51 and the outer shell block 53. At the same time, the second sealing sleeve 58 prevents the sound-insulating inner shaft 52 from directly contacting the outer shell block 53 and the second sound-insulating outer shell 51, thus avoiding the direct transmission of sound wave signals from the contact point. The material of the second sealing sleeve 58 is the same as that of the first sealing sleeve 410, and PEEK material can be selected, which also provides a further sound insulation effect.

[0092] In summary, the acoustic isolation section of the array acoustic logging instrument according to this embodiment of the invention, through the special assembly structure between various parts and the selection of materials, effectively extends the signal transmission time of the main body and reduces the amplitude of the main body signal, thereby improving the measurement accuracy of the logging instrument.

[0093] The above-described embodiments are preferred embodiments of the present invention and are only used to facilitate the illustration of the present invention. They are not intended to limit the present invention in any way. Any person skilled in the art who makes local modifications or alterations to the technical content disclosed in the present invention without departing from the scope of the technical features of the present invention shall still fall within the scope of the technical features of the present invention.

Claims

1. A sound-insulating short section for an array acoustic logging instrument, disposed between the acoustic receiver and the acoustic transmitter of the array acoustic logging instrument, characterized in that, The sound insulation section includes a sound insulation middle component and two sound insulation end components respectively disposed at both ends of the sound insulation middle component. The sound insulation middle component and the sound insulation end components are connected through each other at their axial centers, wherein: The sound insulation end assembly includes: Soundproof connector; A first soundproof housing, one end of which is fitted onto one end of the soundproof joint; A soundproof housing connector, one end of which is fixedly connected to the other end of the first soundproof housing; The sound insulation central component includes: Soundproof inner shaft; Two second soundproof shells are fitted onto the two ends of the soundproof inner shaft, and the ends of the two second soundproof shells away from the soundproof inner shaft are respectively fixedly connected to the other ends of the two soundproof shell joints. The soundproof joint includes a head, a middle section, and a tail section with successively decreasing circumferential diameters. The head of the soundproof joint has a plurality of first connecting holes evenly distributed circumferentially. The outer wall of the middle section of the soundproof joint has a plurality of first outer grooves distributed circumferentially at different axial positions. The inner wall of the middle section of the soundproof joint has a plurality of first inner grooves distributed circumferentially at different axial positions. The outer wall of the tail section of the soundproof joint has a plurality of first sealing grooves distributed circumferentially at different axial positions. A plug is provided in the first outer groove. A rubber ring is provided in the first sealing groove. The outer wall of the tail section of the soundproof joint has a raised first threaded portion distributed circumferentially. The tail section of the soundproof joint has a first anti-rotation head that extends outward axially. One end of the first soundproof shell is fitted onto the middle and tail of the soundproof joint. Multiple second sealing grooves are provided circumferentially at different axial positions on the inner wall of one end of the first soundproof shell. The multiple second sealing grooves are respectively provided with multiple first sealing grooves. Each of the second sealing grooves is provided with a rubber ring. A first sealing sleeve is provided between the first sealing groove and the second sealing groove to fill the gap between the first soundproof shell and the soundproof joint. Multiple second connecting holes are uniformly provided circumferentially at the other end of the first soundproof shell. The sound insulation end assembly also includes: A first locking ring is threadedly connected to the first threaded portion, such that one end of the first soundproof housing abuts against the head of the soundproof joint. A plurality of staggered baffles, a plurality of long baffles, and a plurality of short baffles are fitted between one end of the first soundproof housing and the head of the soundproof joint. A first gasket, a second gasket, a third gasket, and a fourth gasket are sequentially fitted between one end of the first locking ring and the first soundproof housing. A first isolation sleeve is also provided between the first gasket, the second gasket, the third gasket, the fourth gasket, and the soundproof joint. A first mounting groove is provided circumferentially on the outer wall of the first locking ring, and a first support ring is provided in the first mounting groove. A first anti-rotation connector is disposed between the sound insulation connector and the sound insulation shell connector. One end of the first anti-rotation connector is provided with a first anti-rotation groove that matches the first anti-rotation head along the axial direction inward. The first anti-rotation head is inserted into the first anti-rotation groove. The other end of the first anti-rotation connector is provided with a second anti-rotation head that extends outward along the axial direction. One end of the soundproof shell connector has a plurality of third connecting holes evenly distributed circumferentially, corresponding to the plurality of second connecting holes respectively. Each second connecting hole and the corresponding third connecting hole is provided with a connecting post. The connecting post fixes the soundproof shell connector and the first soundproof shell to each other by screws and washers. One end of the soundproof shell connector has a second anti-rotation groove that matches the second anti-rotation head, which is inserted into the second anti-rotation groove. Both ends of the soundproof shell connector have a third sealing groove distributed circumferentially on their outer walls. The third sealing groove contains a rubber ring. The middle outer wall of the soundproof shell connector has a plurality of second outer grooves distributed circumferentially at different axial positions. The second outer groove contains a plug. The middle inner wall of the soundproof shell connector has a plurality of second inner grooves distributed circumferentially at different axial positions. The other end of the soundproof shell connector has a plurality of fourth connecting holes evenly distributed circumferentially. The other end of the soundproof shell connector has a third anti-rotation groove distributed axially inward.

2. The acoustic insulation short section of the array acoustic logging instrument according to claim 1, characterized in that, Each of the two second soundproof shells has a plurality of fifth connecting holes evenly provided circumferentially at the ends away from the inner axis of the soundproof shell, which correspond to the plurality of fourth connecting holes respectively. Each fourth connecting hole and the corresponding fifth connecting hole is provided with a connecting post. The connecting post fixes the two second soundproof shells to the corresponding soundproof shell joints respectively by screws and washers. A second threaded portion is provided on the outer wall of one end of the sound-insulating inner shaft along the circumferential direction, and a support portion is provided on the other end of the sound-insulating inner shaft along the circumferential direction. Both ends of the sound-insulating inner shaft are provided with a third anti-rotation head extending outward along the axial direction. The sound insulation central component also includes: Two outer shell blocks are fitted onto the middle of the inner sound insulation shaft. The two outer shell blocks are located between the two second sound insulation shells. A fourth sealing groove is provided circumferentially at the connection of the two outer shell blocks. A baffle is provided in the fourth sealing groove. A baffle is provided between each outer shell block and the corresponding second sound insulation shell. The second locking ring is threadedly connected to the second threaded part, so that both second soundproof shells and both shell blocks abut against the support part. A fifth gasket, a sixth gasket, a seventh gasket, and an eighth gasket are sequentially fitted between one end of the second locking ring and one of the second soundproof shells. A second isolation sleeve is also provided between the fifth gasket, the sixth gasket, the seventh gasket, and the eighth gasket and the soundproof inner shaft. A second mounting groove is opened circumferentially on the outer wall of the second locking ring. A second support ring is provided in the second mounting groove. A ninth gasket, a tenth gasket, an eleventh gasket, and a twelfth gasket are sequentially fitted between one end of the support part and another of the second soundproof shells. A third isolation sleeve is also provided between the ninth gasket, the tenth gasket, the eleventh gasket, and the twelfth gasket and the soundproof inner shaft. A third mounting groove is opened circumferentially on the support part. A third support ring is provided in the third mounting groove. Two second anti-rotation joints are respectively disposed between the inner sound insulation shaft and the two outer sound insulation shell joints. One end of each second anti-rotation joint is provided with a fourth anti-rotation groove that matches the third anti-rotation head along the axial direction inward. The third anti-rotation head is inserted into the corresponding fourth anti-rotation groove. The other end of each anti-rotation joint is provided with a fourth anti-rotation head that matches the third anti-rotation groove along the axial direction inward. The fourth anti-rotation head is inserted into the corresponding third anti-rotation groove. A second sealing sleeve is provided in the middle of the sound-insulating inner shaft. The second sealing sleeve is used to fill the gaps between the sound-insulating inner shaft and the two outer shell blocks, and between the sound-insulating inner shaft and the two second sound-insulating outer shells.

3. The acoustic insulation short section of the array acoustic logging instrument according to claim 2, characterized in that, The soundproof joint, the first soundproof shell, and the second soundproof shell are made of 17-4PH steel.

4. The sound-insulating short section of an array acoustic logging instrument according to claim 2, characterized in that, The soundproof housing connector is made of TC11 titanium alloy.

5. The acoustic insulation short section of an array acoustic logging instrument according to claim 2, characterized in that, The sound-insulating inner shaft is made of beryllium bronze.

6. The sound-insulating short section of an array acoustic logging instrument according to claim 2, characterized in that, The first anti-transformer, the second anti-transformer, the first sealing sleeve, the second sealing sleeve, the long stop, the short stop, and the outer shell stop are all made of PEEK material.

7. The acoustic insulation short section of an array acoustic logging instrument according to claim 2, characterized in that, The baffle is made of metal.

8. The acoustic insulation short section of an array acoustic logging instrument according to claim 2, characterized in that, Both the first support ring and the second support ring are made of polytetrafluoroethylene.

9. The acoustic insulation short section of an array acoustic logging instrument according to claim 2, characterized in that, The first, second, third, and fourth gaskets are made of metal, rubber, polytetrafluoroethylene (PTFE), and PEEK, respectively; the fifth, sixth, seventh, and eighth gaskets are made of metal, rubber, PTFE, and PEEK, respectively; and the ninth, tenth, eleventh, and twelfth gaskets are made of metal, rubber, PTFE, and PEEK, respectively.

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