An acoustic logging tool

Abstract

The application relates to the technical field of geological exploration, improves the problem that a probe rod cannot be conveniently and stably detected from the middle part of a drilling well, and discloses a sonic logging instrument which comprises a host computer, a cable and a probe rod, one end of the cable is connected to the probe rod, the other end of the cable is connected to a controller, a supporting mechanism is further connected to the cable, the supporting mechanism comprises an adjusting seat matched with the cable and a plurality of telescopic rods arranged along the circumference of the adjusting seat; the telescopic rod comprises a first rod connected with the adjusting seat and a second rod slidably connected with the first rod along the length direction; the bottom of the probe rod is connected with a counterweight mechanism, and the counterweight mechanism comprises a counterweight movably connected with the probe rod. The supporting mechanism is erected on the well mouth through the telescopic rod, the length of the second rod is adjusted so that the probe rod is located at the position of the middle part of the drilling well for detection, and the operation is convenient and fast; the adjusting seat and the counterweight can reduce the possibility of swinging and twisting of the cable and the probe rod, the counterweight can also make the swinging probe rod quickly return to the original position, and the detection accuracy of the probe rod is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological exploration, in particular to a sound wave logging instrument. BACKGROUND

[0002] In the exploration technology of geological exploration, oil development and other drilling needs, a sound wave logging instrument is usually used to detect the geological conditions of the drilling, and the acoustic properties such as the propagation speed, amplitude and frequency of sound waves in different rocks are used to study the geological profile properties of the drilling.

[0003] The sound wave logging instrument includes a long strip-shaped probe rod, a cable connected to the top of the probe rod, and the other end of the cable connected to the host computer. The cable not only transmits the detection signal, but also can pull the probe rod in and out of the drilling.

[0004] In order to improve the detection accuracy, the probe rod needs to enter the middle of the drilling for detection. When the width of the drilling is large, a crane is used to lift the probe rod to the middle of the drilling and then adjust the cable. This not only is troublesome and costly, but also when the drilling depth is large, the cable is unstable because the length of the cable is too long, and the probe rod is easy to shake. The sound wave logging instrument emits sound waves through the emitting part on the probe rod and receives reflected sound waves through the receiving part. If the probe rod shakes, it will easily affect the detection effect. SUMMARY

[0005] In order to improve the defect that the probe rod is not convenient to stably detect from the middle of the drilling, the present application provides a sound wave logging instrument.

[0006] The present application provides a sound wave logging instrument, which adopts the following technical scheme:

[0007] A sound wave logging instrument, comprising a host computer, a cable and a probe rod, one end of the cable being connected to the probe rod, the other end of the cable being connected to a controller, a supporting mechanism being further connected to the cable, the supporting mechanism comprising an adjusting seat fitted on the cable and a plurality of telescopic rods arranged along the circumference of the adjusting seat; the telescopic rod comprising a first rod connected to the adjusting seat and a second rod slidingly connected to the first rod along the length direction; the bottom of the probe rod being connected to a counterweight mechanism, the counterweight mechanism comprising a counterweight movably connected to the probe rod.

[0008] By adopting the technical scheme, the supporting mechanism is erected on the well mouth through the telescopic rod, the adjusting seat is located at the middle part of the well mouth by adjusting the length of each second rod, that is, the probe rod can be located at the middle part of the well for detection, the detection accuracy of the probe rod is improved, and the operation is convenient and fast; because the probe rod and the counterweight mechanism are heavy, when the cable is loosened, the probe rod will automatically fall down, the cable is matched with the erection through the adjusting seat, the adjusting seat can comb and abut against the cable, thereby reducing the possibility of swing and distortion of the cable and the probe rod, the counterweight movably connected with the probe rod can further reduce the possibility of swing of the probe rod, even if the probe rod swings, the counterweight can also make the probe rod quickly return to the original position, and the influence on the sound wave detection is reduced.

[0009] Optionally, the first rod is internally provided with a connecting groove for cooperation and sliding of the second rod, a bottom surface of the second rod is provided with a containing groove, and an inner wall of the containing groove is hingedly connected with a limiting piece; after the second rod slides away from the first rod, the limiting piece is separated from the first rod and rotates downward under the action of gravity, and the second rod is internally provided with a positioning piece for limiting a rotating range of the limiting piece.

[0010] By adopting the technical scheme, when the second rod slides away from the first rod during erection of the supporting mechanism, the limiting piece hingedly connected with the bottom of the second rod is separated from the first rod, the limiting piece automatically rotates downward under the action of gravity, and the positioning piece can limit the limiting piece to rotate to a position parallel to the inner wall of the well and then continue to rotate; when the second rod continues to slide away from the first rod, that is, towards the inside of the well, the limiting piece can abut against the inside of the well, and the second rod abuts against the surface of the well, so that the supporting mechanism is more stably supported on the well; moreover, the limiting piece can abut against the inner wall of the well to more accurately confirm the position of the adjusting seat relative to the well, so that the probe rod is accurately located at the middle part of the well, and the convenience of the central adjustment of the probe rod is improved.

[0011] Optionally, one side of the limiting piece away from the probe rod is provided with a plurality of sharp parts.

[0012] By adopting the technical scheme, when the limiting piece moves to abut against the inner wall of the well, the sharp parts can be inserted into the inner wall of the well, so that the supporting mechanism is more stably fixed on the well mouth, thereby ensuring the stability of the probe rod during detection.

[0013] Optionally, a through groove is formed in the middle part of the adjusting seat, two rotating rollers abutting against the cable are rotationally connected in the through groove, and the rotating shaft direction of the rotating rollers is perpendicular to the moving direction of the cable.

[0014] By adopting the above technical scheme, two rotating rollers are arranged in the adjusting seat and abut against the cable, so that the movement of the cable is more stable, and when the cable continuously extends downward along with the probe rod, the rotating rollers rotate together under the friction of the cable, compared with sliding friction, the resistance to the cable is reduced, so that the movement of the probe rod is more smooth, and the detection accuracy is further ensured.

[0015] Optionally, a sliding member is slidingly connected in the adjusting seat, two ends of the rotating roller are rotationally connected with the sliding member, and the sliding member has an elastic member for driving the sliding member to move close to each other.

[0016] By adopting the above technical scheme, the rotating roller can slide while rotating with the adjusting seat through the sliding member, and the elastic member drives the two rotating rollers to move close to each other to abut against the cable, so that when the cable shakes due to continuous extension, the elastic member can absorb the shaking, and the probe rod can always be located in the middle of the well for detection.

[0017] Optionally, the counterweight mechanism comprises a connecting member connected with the probe rod, the connecting member is provided with a movable slot in the diameter direction of the probe rod, and the counterweight member comprises a sliding portion slidingly connected in the movable slot and a counterweight portion hinged to one end of the sliding portion away from the connecting member.

[0018] By adopting the above technical scheme, when the probe rod swings along the length direction of the movable slot, the counterweight member can slide along the movable slot in the opposite direction of the deviation direction of the probe rod due to the large gravity, that is, it will move to the middle of the well, so as to drive the probe rod to quickly recover to the vertical state; when the probe rod swings in other directions, the counterweight portion hinged to the sliding portion can also be kept in the vertical state under the action of gravity, so as to quickly reset the probe rod and reduce the influence on the sound wave detection of the probe rod.

[0019] Optionally, the movable slot is arranged in an arc shape protruding away from the probe rod.

[0020] By adopting the above technical scheme, the bottom of the movable slot is located at the center position of the probe rod, so that the counterweight member can slide to the lowest part of the movable slot, so that the center of gravity of the probe rod remains stable, and the possibility of swinging of the probe rod is further reduced.

[0021] Optionally, the counterweight mechanism further comprises a mounting member connected with the probe rod, the connecting member is rotationally connected to the mounting member, and the rotation axis direction of the connecting member is consistent with the radial direction of the probe rod.

[0022] By adopting the technical scheme, when the probe rod swings in any direction, the counterweight has a traction force opposite to the offset direction on the probe rod, at this time, the lowest point of the movable groove changes to the end of the movable groove, the connecting piece is rotationally connected with the mounting piece, the counterweight has a tendency to move to the lowest point of the movable groove, and the counterweight can drive the connecting piece to rotate to move downward to the lowest point of the movable groove when sliding, so that the probe rod is recovered to the original position more quickly.

[0023] Optionally, the inner wall of the mounting piece is circumferentially arrayed with a plurality of buffer pieces, and the buffer pieces can move towards or away from the connecting piece.

[0024] By adopting the technical scheme, the buffer piece is arranged between the connecting piece and the mounting piece, and when the probe rod swings and offsets, the mounting piece fixed with the probe rod moves, but the connecting piece and the counterweight move relatively with the mounting piece due to gravity and inertia, and the buffer piece can absorb the possibility of shaking of the connecting piece when moving.

[0025] Optionally, the probe rod comprises, from bottom to top, a transmitting unit, a sound insulation unit and a receiving unit, and the sound insulation unit is circumferentially arrayed with a plurality of rib plates.

[0026] By adopting the technical scheme, the rib plates are arranged on the surface of the long cylindrical probe rod, so that the air resistance is increased, the possibility of shaking of the probe rod when moving in the well is further reduced, and the detection accuracy is improved.

[0027] In summary, the present application has at least one of the following beneficial effects:

[0028] 1. The support mechanism is erected on the well mouth through the telescopic rod, the adjusting seat is located at the middle of the well mouth by adjusting the length of each second rod, and the adjusting seat is limited by abutting against the inner wall of the well through the limiting piece, so that the position of the adjusting seat relative to the well can be more accurately confirmed, the probe rod is accurately located at the middle of the well, and the convenience of centering adjustment of the probe rod and the detection accuracy of the probe rod are improved.

[0029] 2. The cable is cooperatively arranged through the adjusting seat, the adjusting seat can comb and abut against the cable, and the possibility of swinging and twisting of the cable and the probe rod is reduced.

[0030] 3. The counterweight movably connected with the probe rod not only further reduces the possibility of swinging of the probe rod, but also enables the probe rod to quickly return to the original position even if the probe rod swings, so that the influence on the acoustic wave detection is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of an acoustic logging instrument in the embodiment of the present application;

[0032] Figure 2is a structure of the support mechanism in the embodiment of the application, a vertical plane cross-sectional view;

[0033] Figure 3 is another structure of the adjusting seat in the embodiment of the application, a horizontal plane cross-sectional view;

[0034] Figure 4 is a schematic diagram of one structure of the counterweight mechanism in the embodiment of the application;

[0035] Figure 5 is a schematic diagram of another structure of the counterweight mechanism in the embodiment of the application.

[0036] Mark explanation: 1, main machine; 2, cable; 3, probe rod; 31, transmitting unit; 32, sound insulation unit; 33, receiving unit; 4, support mechanism; 5, adjusting seat; 51, through slot; 52, rotating roller; 521, annular groove; 53, sliding piece; 54, elastic piece; 55, sliding groove; 6, telescopic rod; 61, first rod; 611, connecting groove; 62, second rod; 621, accommodating groove; 63, limiting piece; 631, thorn part; 632, limiting part; 633, abutting part; 64, positioning piece; 65, locking piece; 7, counterweight mechanism; 71, counterweight piece; 711, sliding part; 712, counterweight part; 72, connecting piece; 721, movable groove; 722, limiting ring; 73, mounting piece; 731, cylindrical groove; 732, limiting groove; 74, bearing; 75, buffer piece; 8, rib plate. DETAILED DESCRIPTION

[0037] The following will be described in detail in combination with the accompanying Figures 1-5 The application will be further described in detail.

[0038] Reference Figure 1 , the embodiment of the application discloses a sonic logging instrument, which comprises a main machine 1, a cable 2 and a probe rod 3, one end of the cable 2 is connected to the probe rod 3, the other end of the cable 2 is connected to a controller, a support mechanism 4 is further connected to the cable 2, the support mechanism 4 comprises an adjusting seat 5 which is sleeved on the cable 2 and a plurality of telescopic rods 6 which are arranged along the circumference of the adjusting seat 5, the support mechanism 4 is arranged on the wellhead of a well, the length of the telescopic rod 6 can be adjusted to make the probe rod 3 slide down from the middle part of the well, so that the operation is convenient and fast; the bottom of the probe rod 3 is further connected to a counterweight mechanism 7 for making the probe rod 3 more stably move in the middle part of the well.

[0039] The probe rod 3 is a long rod, comprising a transmitting unit 31, a sound insulation unit 32 and a receiving unit 33 connected in sequence from bottom to top, and a through hole is formed on the shell of the transmitting unit 31 and the receiving unit 33 for the sound wave to pass through, the sound wave is transmitted obliquely upward from the transmitting unit 31, reflected by the well wall and then folded back into the receiving unit 33, the receiving unit 33 transmits the changes of the sound wave propagation speed, amplitude and frequency data to the host computer 1 through the cable 2, and the host computer 1 obtains the geological profile characteristics of the well by calculation and analysis.

[0040] The adjusting seat 5 and the telescopic rod 6 are made of metal or alloy with high structural strength.

[0041] In other embodiments, only one slot hole can be formed in the middle of the adjusting seat 5, the inner diameter of the slot hole is consistent with the diameter of the cable 2, and the inner wall of the slot hole can be provided with a spring pad, a rubber pad or a sponge pad and other elastic components with elasticity, as the cable 2 continuously extends, the cable 2 can swing, and the elastic component can absorb the swing of the cable 2, thereby reducing the swing of the probe rod 3.

[0042] Referring to Figure 2 In this embodiment, in order to make the activity of the cable 2 more stable, a through slot 51 is formed in the middle of the adjusting seat 5, and two rotating rollers 52 abutting against the cable 2 are hinged in the through slot 51, the rotating shaft direction of the rotating rollers 52 is perpendicular to the activity direction of the cable 2, preferably, a ring-shaped slot 521 is formed in the middle of the rotating roller 52, and the ring-shaped slots 521 of the two rotating rollers 52 are connected to form a slot hole for the cable 2 to pass through, when the cable 2 continuously extends downward with the probe rod 3, the rotating rollers 52 are rotated together by the friction of the cable 2, compared with sliding friction, the rolling friction reduces the resistance to the cable 2, making the activity of the probe rod 3 more smooth, thereby ensuring the accuracy of detection.

[0043] Referring to Figure 3 Further, in order to reduce the possibility of the cable 2 shaking due to continuous extension, a sliding groove 55 is formed in the adjusting seat 5 and communicates with the through slot 51, a sliding member 53 is slidably connected in the sliding groove 55, the two ends of the rotating roller 52 are rotatably connected with the sliding member 53, the sliding member 53 is provided as a sliding block, a bearing 74 can be connected between the rotating roller 52 and the sliding member 53 to make the rotation more stable, the sliding member 53 is provided with an elastic member 54 for driving the sliding member 53 to move close to each other, the elastic member 54 can be provided as a spring, one end of the spring is connected to the inner wall of the sliding groove 55, and the other end is connected to the sliding member 53. In normal state, the elastic member 54 drives the two rotating rollers 52 to move close to each other to abut against the cable 2, and the rotating rollers 52 rotate with the cable 2; when the cable 2 shakes, the elastic member 54 can absorb the shaking, further ensuring that the probe rod 3 can always be located in the middle of the well for detection.

[0044] It should be noted that, in order to facilitate the installation of the inner part of the adjusting seat 5 and facilitate the adjusting seat 5 to be sleeved on the cable 2, the adjusting seat 5 can be two symmetrical parts spliced and fixed by bolts or welding.

[0045] With reference to Figure 2 , the telescopic rods 6 are arranged on the ground around the well so as to fix the adjusting seat 5 in the middle of the well, the number of the telescopic rods 6 is preferably set to be at least four, the telescopic rods 6 include a first rod 61 connected with the adjusting seat 5 and a second rod 62 slidably connected with the first rod 61 along the length direction, the first rod 61 and the second rod 62 are preferably set to be square rods so as to be more stably supported on the ground, and a locking piece 65 for locking the movement of the second rod 62 is connected between the first rod 61 and the second rod 62. Specifically, the first rod 61 is internally provided with a connecting groove 611 for the second rod 62 to slide, the surface of the first rod 61 is provided with a connecting column with internal threads, and the locking piece 65 can be set to be a locking bolt, which is locked by penetrating the connecting column and abutting against the second rod 62 so as to lock the second rod 62. As a preferred embodiment, the upper surface of the second rod 62 can be marked with a scale, the value of the scale gradually increases from the end of the second rod 62 to the direction of the first rod 61, because the length of the first rod 61 is fixed, the position of the adjusting seat 5 relative to the well can be determined by observing the extension length of the second rod 62 relative to the first rod 61, because the shape of the well mouth can be irregular, the extension lengths of two second rods 62 located on the same straight line are adjusted to be consistent, so that the adjusting seat 5 can be accurately adjusted to the middle position of the well mouth, without the need of other length measuring equipment, the operation is convenient and fast.

[0046] In other embodiments, a distance sensor can be arranged on each second rod 62, the distance sensor is electrically connected with the host computer 1 in a wireless manner, and the position of the adjusting seat 5 can be more accurately and conveniently determined through the display and calculation on the host computer 1.

[0047] Further, the bottom surface of the second rod 62 is provided with a receiving groove 621, the inner wall of the receiving groove 621 is hingedly connected with a limiting piece 63, after the second rod 62 slides away from the first rod 61, the limiting piece 63 is separated from the first rod 61 and rotates downward under the action of gravity, the second rod 62 is provided with a positioning piece 64 limiting the rotation range of the limiting piece 63, the positioning piece 64 limits the limiting piece 63 to rotate to be parallel to the inner wall of the well, generally the well is drilled vertically, therefore, preferably, the positioning piece 64 can limit the limiting piece 63 to rotate to the vertical state and then continue to rotate away from the inner wall of the well. In addition, in order to make the limiting piece 63 move more stably, a torsional spring can be sleeved on the rotating shaft of the limiting piece 63, the torsional spring drives the limiting piece 63 to rotate away from the second rod 62; the limiting piece 63 can be provided in a long strip shape consistent with the shape of the slot of the receiving groove 621, the limiting piece 63 includes a limiting portion 632 and an abutting portion 633 connected with each other, the rotating shaft of the limiting piece 63 is located between the limiting portion 632 and the abutting portion 633, and the positioning piece 64 is preferably provided in a rod shape parallel to the rotating shaft of the limiting piece 63.

[0048] When the second rod 62 slides away from the first rod 61, the limiting piece 63 hingedly connected to the bottom of the second rod 62 is separated from the first rod 61, the limiting piece 63 automatically rotates downward under the action of gravity or the elastic force of the torsional spring, and the positioning piece 64 can limit the limiting piece 63 to rotate to a position parallel to the inner wall of the well and then continue to rotate, when the second rod 62 continues to slide away from the first rod 61, i.e. towards the inside of the well, the limiting piece 63 can abut against the inside of the well, and the supporting mechanism 4 is more stably supported on the well; moreover, the second rod 62 has a portion above the well mouth and a portion on the bottom surface, and the stretching length of the second rod 62 above the well mouth can be better confirmed by measuring the limiting piece 63, i.e. the probe rod 3 can be accurately located in the middle of the well.

[0049] Further, the side of the limiting piece 63 away from the probe rod 3 is also provided with a plurality of sharp portions 631, the sharp portions 631 can be inserted into the inner wall of the well, so that the supporting mechanism 4 is more stably fixed on the well mouth, thereby ensuring the stability of the probe rod 3 during detection.

[0050] In other embodiments, the first rod 61 can be fixedly connected with the adjusting seat 5.

[0051] In this embodiment, in order to facilitate storage and transportation, the first rod 61 can be hingedly connected with the adjusting seat 5, in the storage state, the cable 2 is reeled to the shortest state, then the second rod 62 is slid towards the first rod 61 to the limit position, and then the telescopic rod 6 is rotated towards the probe rod 3 to abut against the probe rod 3.

[0052] Optionally but not limitatively, the circumferential array of soundproofing units 32 is provided with a plurality of rib plates 8, and rubber strips are adhered to the side edges of the rib plates 8 away from the soundproofing units 32. On the one hand, the rib plates 8 can increase air resistance, further reduce the possibility of the probe rod 3 rotating and swinging when moving in the well, and improve the detection accuracy; on the other hand, even if the probe rod 3 swings too much to approach the inner wall of the well, the rib plates 8 can also protect the probe rod 3. In addition, the gaps between the rib plates 8 correspond to the telescopic rods 6, so that the telescopic rods 6 can be folded into the gaps.

[0053] The counterweight mechanism 7 includes a counterweight 71 movably connected with the probe rod 3.

[0054] In other embodiments, the counterweight mechanism 7 can include a containing tank arranged at the bottom of the probe rod 3, the counterweight 71 is arranged to be filled with liquid in the containing tank, and the liquid does not fill the containing tank; the liquid can be arranged as high-density mercury, when the probe rod 3 swings, the mercury will gather in the lower part, so as to make the gravity center of the probe rod 3 deviate to the middle of the well, and make the probe rod 3 quickly recover to the vertical state.

[0055] Referring to Figure 4 In the embodiment, the counterweight 71 is arranged as a spherical counterweight block, and the material of the counterweight 71 can be lead block, depleted uranium, tungsten alloy, cement, etc. The counterweight mechanism 7 further includes a connecting piece 72 connected with the probe rod 3, the connecting piece 72 is provided with a movable slot 721 along the diameter direction of the probe rod 3, the counterweight 71 includes a sliding part 711 slidably connected in the movable slot 721 and a counterweight part 712 hinged with one end of the sliding part 711 away from the connecting piece 72, and the one end of the sliding part 711 away from the connecting piece 72 is provided with a spherical slot, and the top of the counterweight 71 is also arranged as a spherical shape matched with the spherical slot. The movable slot 721 can be arranged as a horizontal long strip, and preferably, the movable slot 721 is arranged as an arc shape protruding away from the probe rod 3, and the bottom of the movable slot 721 is located at the center position of the probe rod 3, so that the counterweight 71 has a tendency to move to the lowest part of the movable slot 721. When the probe rod 3 swings along the length direction of the movable slot 721, the counterweight 71 can slide along the movable slot 721 to the opposite direction of the deviation direction of the probe rod 3 due to the large gravity, that is, the counterweight 71 will move to the middle of the well, so as to drive the probe rod 3 to quickly recover to the vertical state; when the probe rod 3 swings to other directions, the counterweight part 712 hinged with the sliding part 711 can also be kept in the vertical state due to the gravity, so as to quickly reset the probe rod 3 and reduce the influence on the sound wave detection of the probe rod 3.

[0056] Further, in order to make the probe rod 3 return to the original position faster, the counterweight mechanism 7 further comprises a mounting piece 73 connected with the probe rod 3, and the connecting piece 72 is rotationally connected to the mounting piece 73, and the rotation axis direction of the connecting piece 72 is consistent with the radial direction of the probe rod 3. The bottom outer surface of the probe rod 3 can be provided with external threads, and the mounting piece 73 is provided with internal threads matched with the external threads for screwing, and the whole counterweight mechanism is detachably connected with the probe rod 3 through the screwing, and the mounting is convenient and fast; the connecting piece 72 is provided in a cylindrical shape, and the end surface of the mounting piece 73 away from the probe rod 3 is provided with a cylindrical groove 731 for the connecting piece 72 to enter, and the end of the connecting piece 72 away from the counterweight 71 is provided with a limiting ring 722 with a larger diameter, and the mounting piece 73 is provided with a limiting groove 732 in communication with the cylindrical groove 731, and the limiting ring 722 is connected in the limiting groove 732 so as to limit the connecting piece 72 from being separated from the mounting piece 73, and the mounting piece 73 can be two symmetrical parts welded together to facilitate the mounting of the connecting piece 72.

[0057] With reference to Figure 4 In an embodiment, the mounting piece 73 and the connecting piece 72 are connected through a bearing 74, so that the rotation of the connecting piece 72 is more stable, and the efficiency of the probe rod 3 returning to the middle position of the well is improved.

[0058] With reference to Figure 5 In an embodiment, the inner wall of the cylindrical groove 731 of the mounting piece 73 is provided with a plurality of buffer pieces 75 arranged in the circumferential direction, and the buffer pieces 75 can move towards or away from the connecting piece 72, and the buffer piece 75 can be a glass bead screw, which is composed of a spring, a steel ball and a shell, the shell is screwed into the inner wall of the cylindrical groove 731, the steel ball is driven by the spring to protrude from the groove wall of the cylindrical groove 731 and abut against the connecting piece 72, and the steel ball can completely enter the shell after being extruded. When the probe rod 3 swings and deviates, the mounting piece 73 fixed with the probe rod 3 will move, but the connecting piece 72 and the counterweight 71 will relatively move with the mounting piece 73 due to gravity and inertia, and the buffer piece 75 can absorb the possibility of shaking of the connecting piece 72 when moving, and reduce the influence on the acoustic wave detection.

[0059] The implementation principle of the acoustic logging instrument according to the embodiment of the application is as follows:

[0060] Before use, the telescopic rod 6 is unfolded, and then the second rod 62 is pulled away from the first rod 61 to abut against the inner wall of the well, and then the second rod 62 is supported on the ground around the well, the length of the second rod 62 extending from the first rod 61 is adjusted, the distance between the limiting piece 63 on the corresponding two second rods 62 and the first rod 61 is adjusted to be consistent, and then the adjusting seat 5 can be accurately adjusted to the middle position of the well mouth, that is, the probe rod 3 can be located in the middle of the well for detection, the operation is convenient and fast, and the detection accuracy of the probe rod 3 is improved. Because the weight of the probe rod 3 and the counterweight mechanism 7 is large, when the cable 2 is loosened, the probe rod 3 will automatically fall down, the cable 2 is matched with the cable 2, the rotating roller 52 can comb and abut against the cable 2, and can also absorb the vibration of the cable 2, thereby reducing the possibility of swing and distortion of the cable 2 and the probe rod 3; even if the probe rod 3 swings, the connecting piece 72 will be rotated to the lowest position along the activity groove 721 under the action of the gravity of the counterweight 71, that is, the counterweight 71 will tend to move to the middle position of the well, so that the probe rod 3 can quickly return to the middle position of the well, reducing the influence on the sound wave detection, and further improving the detection accuracy of the probe rod 3.

[0061] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An acoustic logging instrument comprising a mainframe (1), a cable (2) and a probe pole (3), one end of the cable (2) being connected to the probe pole (3), the other end of the cable (2) being connected to a controller, characterized in that: A support mechanism (4) is further connected to the cable (2), the support mechanism (4) comprises an adjusting seat (5) sleeved on the cable (2) and a plurality of telescopic rods (6) arranged along the circumference of the adjusting seat (5); the telescopic rod (6) comprises a first rod (61) connected with the adjusting seat (5) and a second rod (62) slidingly connected with the first rod (61) along the length direction; the bottom of the probe rod (3) is connected with a counterweight mechanism (7), the counterweight mechanism (7) comprises a counterweight (71) movably connected with the probe rod (3); A connecting groove (611) is formed in the first rod (61) for the second rod (62) to slide, a receiving groove (621) is formed in the bottom surface of the second rod (62), a limiting piece (63) is hinged to the inner wall of the receiving groove (621), after the second rod (62) slides away from the first rod (61), the limiting piece (63) is separated from the first rod (61) and rotates downward under the action of gravity, and a positioning piece (64) is arranged in the second rod (62) to limit the rotation range of the limiting piece (63); A through groove (51) is formed in the middle of the adjusting seat (5), two rotating rollers (52) abutting against the cable (2) are rotatably connected in the through groove (51), and the rotating shaft direction of the rotating roller (52) is perpendicular to the movement direction of the cable (2); The counterweight mechanism (7) comprises a connecting piece (72) connected with the probe rod (3), the connecting piece (72) is provided with a movable groove (721) along the diameter direction of the probe rod (3), and the counterweight (71) comprises a sliding part (711) slidingly connected in the movable groove (721) and a counterweight part (712) hinged to one end of the sliding part (711) away from the connecting piece (72).

2. The acoustic well-logging apparatus of claim 1, wherein: A plurality of sharp parts (631) are arranged on the side of the limiting piece (63) away from the probe rod (3).

3. The acoustic well-logging apparatus of claim 1, wherein: A sliding piece (53) is slidingly connected in the adjusting seat (5), both ends of the rotating roller (52) are rotatably connected with the sliding piece (53), and the sliding piece (53) is provided with an elastic piece (54) driving the sliding piece (53) to move close to each other.

4. The acoustic well-logging apparatus of claim 1, wherein: The movable groove (721) is arranged in an arc shape protruding away from the probe rod (3).

5. The acoustic well-logging apparatus of claim 1, wherein: The counterweight mechanism (7) further comprises a mounting piece (73) connected with the probe rod (3), the connecting piece (72) is rotatably connected to the mounting piece (73), and the rotating shaft direction of the connecting piece (72) is consistent with the radial direction of the probe rod (3).

6. An acoustic well-logging apparatus as defined in claim 5, wherein: A plurality of buffer pieces (75) are arranged along the circumference on the inner wall of the mounting piece (73), and the buffer pieces (75) can move towards or away from the connecting piece (72).

7. The acoustic well-logging apparatus of claim 1, wherein: The probe rod (3) comprises a transmitting unit (31), a sound insulation unit (32) and a receiving unit (33) connected in sequence from bottom to top, and a plurality of rib plates (8) are arranged along the circumference of the sound insulation unit (32).

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