A downhole geophone for geophysical exploration

Abstract

The present invention relates to the technical field of downhole exploration, and discloses a downhole detector for geophysical exploration, including a shell, a vertical rod connected to a suspension rope is elastically and slidably inserted in the shell through an elastic mechanism, a plurality of hanging mechanisms are arranged in a circumferential array on the vertical rod, the hanging mechanism includes a hanging plate that is transmission-connected to the vertical rod and slides through the shell, a limit plate that is elastically and rotatably arranged on the hanging plate to abut against the well wall, the free end of the limit plate is tilted upward during the process of the detector entering the well, and the vertical rod drives the hanging plate to slide outward to squeeze the well wall during the process of pulling up the suspension rope so that the limit plate prevents the detector from moving up, so that the detector is stabilized in the well. The present invention can activate each hanging mechanism by only pulling up the suspension rope, so that each hanging plate squeezes the well wall at the same time, and the detector is stably hung on the well wall under the action of the squeezing force, without the need for electrical support, so that the hanging mechanism can still be used without electrical support.

Description

Technical Field

[0001] The invention relates to the technical field of downhole exploration, and in particular to a downhole geophone for geophysical exploration. Background Art

[0002] In the process of geophysical exploration, it is necessary to use geophones for downhole monitoring to obtain seismic wave signals of different layers in the well. Through the different seismic wave signals collected, it can be roughly determined whether the material to be collected exists, such as oil seismic exploration, geological and mineral exploration, etc. In actual applications, the geophone enters the well through the suspension rope under the action of gravity. After reaching the predetermined depth, the hanging device is activated to make the geophone close to the well wall, and then the source is stimulated to collect seismic wave signals. After the signal collection is completed, the hanging device is released, and the geophone is lowered to a new depth to collect signals again. In the process of collecting signals, ensuring the stability of the geophone through the hanging device is an important condition to ensure accurate detection.

[0003] For example, the utility model patent with application number CN201921069985.8, publication number CN210129045U, and name "A downhole detector for geophysical prospecting" discloses a shell with a piston transmission mechanism inside. The piston transmission mechanism includes a cross seat, a piston-type micro air pump, an airtight chamber, a sleeve, a piston and a push rod. A hanging mechanism is arranged at the bottom of the push rod. The explorer controls the piston-type micro air pump to supply air and pressurize the airtight chamber, so that the piston drives the push rod downward in the sleeve, and the push rod drives the connecting rods on both sides to extend outward. The connecting rod passes through the through groove to drive the hanging seat to expand outward. At the same time, the telescopic rod slides upward in the fixed rod to provide a fulcrum for the hanging seat and provide sufficient buffer space. Then the hanging seat drives the teeth to expand outward to couple the two sides of the well wall, thereby realizing hanging for stable signal acquisition.

[0004] Although the detector provided by the above patent can achieve the purpose of keeping the detector in a stable state by hanging the detector on the well wall through the hanging mechanism, its disadvantage is that since the hanging mechanism needs to be driven by a micro air pump, and the operation of the micro air pump requires power support, if the power supply that provides power to the micro air pump is out of power during exploration or there is a short circuit or open circuit in the power line, it will lead to the inability to provide power support for the micro air pump and the hanging mechanism will be unable to operate. It can be seen that in the prior art, the operating conditions of the hanging mechanism are restricted, and the hanging mechanism will be unable to be used without power support. Summary of the invention

[0005] The object of the present invention is to provide a downhole geophone for geophysical exploration to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a downhole detector for geophysical exploration, comprising a shell, in which a vertical rod connected to a suspension rope is elastically slidably inserted through an elastic mechanism, and a plurality of hanging mechanisms are arranged in a circumferential array on the vertical rod, and the hanging mechanism comprises a hanging plate which is transmission-connected to the vertical rod and slides through the shell, and a limit plate which abuts against the well wall is elastically rotatably provided on the hanging plate, and the free end of the limit plate is tilted upward during the process of the detector entering the well, and the hanging rope is pulled up so that the limit plate prevents the detector from moving upward, and the vertical rod drives the hanging plate to slide outward to squeeze the well wall to stabilize the detector in the well.

[0007] The above-mentioned downhole geophone for geophysical exploration, the hanging mechanism includes a crank arm with one end rotatably connected to the vertical rod and the other end rotatably connected to the hanging plate. When the geophone enters the downhole, the crank arm tilts upward from the inside to the outside.

[0008] In the above-mentioned downhole geophone for geophysical exploration, a connection disk is fixedly sleeved on the vertical rod, and grooves corresponding to each hanging mechanism are opened on the connection disk, and a shaft body rotatably plugged with the crank arm is installed in the groove.

[0009] In the above-mentioned downhole geophone for geophysical exploration, slide plates are symmetrically arranged on the front and rear sides of the hanging plate, and the housing is provided with slide grooves corresponding to each slide plate, and the slide plates are horizontally slidably connected to the slide grooves.

[0010] In the above-mentioned downhole geophone for geophysical exploration, a plurality of cone columns are fixedly provided on the end surface of the hanging plate close to the well wall so that the free end of each cone column is inserted into the well wall when the hanging plate slides outward.

[0011] In the above-mentioned downhole geophone for geophysical exploration, a horizontal axis is fixedly mounted on the hanging plate, the limit plate is rotatably plugged with the horizontal axis, and a torsion spring is arranged between the limit plate and the horizontal axis.

[0012] In the above-mentioned downhole geophone for geophysical exploration, in the initial state, the limit plate and the hanging plate are in a horizontal state under the elastic force of the torsion spring.

[0013] The above-mentioned downhole detector for geophysical exploration, the elastic mechanism includes a first seesaw and a second seesaw arranged opposite to each other, the ends of the first seesaw and the second seesaw that are close to each other are rotatably connected to the vertical rod through a rotating shaft, the first seesaw is rotatably connected to the shell through a first support rod, the second seesaw is rotatably connected to the shell through a second support rod, and elastic members are arranged between the ends of the first seesaw and the second seesaw that are far away from each other and the shell.

[0014] The above-mentioned downhole detector for geophysical exploration, the elastic part includes a first sliding rod and a second sliding rod that are elastically slidably connected, the first sliding rod is located above the second sliding rod, the top of the first sliding rod is fixedly connected to a horizontal rod, the first rocker is provided with a first long hole that is slidably connected to the horizontal rod, and the second rocker is provided with a second long hole that is slidably connected to the horizontal rod.

[0015] In the above-mentioned downhole geophone for geophysical exploration, a cavity is provided in the second slide bar for the first slide bar to slide into, and a compression spring is provided between the cavity of the second slide bar and the bottom of the first slide bar.

[0016] In the above technical scheme, the present invention provides a downhole detector for geophysical exploration, which elastically rotates and sets a limit plate that abuts against the well wall on a hanging plate. During the process of the detector entering the well, the free end of the limit plate is tilted upward under the action of the well wall, and the hanging plate does not contact the well wall, so that the detector can smoothly enter the well, and the limit plate in this process will not hinder the movement of the detector; when it is necessary to hang the hanging mechanism on the well wall, the lifting rope is pulled up to make the vertical rod have an upward force, and since the free end of the limit plate is tilted upward, an extrusion force is generated between the limit plate and the well wall to prevent the detector from moving up, and since the limit plate is rotatably connected to the hanging plate, the hanging plate is slidably connected to the shell and transmission-connected to the vertical rod, so that the upward force on the vertical rod can drive the hanging plates on each hanging mechanism to slide outward at the same time (that is, slide toward the well wall) so that the free end of the hanging plate squeezes the well wall, so that the detector is stably hung on the well wall, and the whole hanging process does not require power support. Compared with the prior art, the present invention can activate each hanging mechanism by only pulling the suspension rope upwards, so that each hanging plate can squeeze the well wall at the same time. Under the action of the squeezing force, the detector can be stably hung on the well wall without the support of electricity. Therefore, the hanging mechanism can still be used without power support, which can effectively solve the shortcomings of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure of a detector provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of the detector with the housing removed provided by an embodiment of the present invention;

[0020] Figure 3The embodiment of the present invention provides Figure 2 A schematic diagram of the enlarged structure of part A;

[0021] Figure 4 A cross-sectional view of an elastic member provided in an embodiment of the present invention;

[0022] Figure 5 A front view of a detector with the housing removed provided by an embodiment of the present invention;

[0023] Figure 6 A cross-sectional view of a geophone provided by an embodiment of the present invention when entering a well and moving downward;

[0024] Figure 7 A cross-sectional view of the geophone when the vertical rod is pulled up to extend the hanging plate outward to the longest length provided in the embodiment of the present invention;

[0025] Figure 8 A cross-sectional view of a detector during the process of moving upward from a well provided by an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Shell; 101. Top cover; 102. Middle plate; 1021. First activity space; 1022. Second activity space; 103. Bottom cover; 2. Vertical rod; 201. Rotating shaft; 3. Hanging plate; 301. Horizontal axis; 302. Slide plate; 303. Axle pin; 304. Cone column; 4. Torsion spring; 5. Limiting plate; 6. Signal detection component; 7. First seesaw; 701. First long hole; 702. First support rod; 8. Second seesaw; 801. Second long hole; 802. Second support rod; 9. Horizontal rod; 10. First slide rod; 11. Second slide rod; 12. Compression spring; 13. Connecting plate; 1301. Groove; 1302. Axle body; 14. Crank arm. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-8 As shown, an embodiment of the present invention provides a downhole detector for geophysical exploration, including a shell 1, in which a vertical rod 2 connected to a suspension rope is elastically slidably inserted through an elastic mechanism, and a plurality of hanging mechanisms are arranged in a circumferential array on the vertical rod 2, and the hanging mechanism includes a hanging plate 3 which is transmission-connected to the vertical rod 2 and slides through the shell 1, and a limit plate 5 which abuts against the well wall is elastically rotatably provided on the hanging plate 3. During the process of the detector entering the well, the free end of the limit plate 5 tilts upward, and during the process of pulling up the suspension rope so that the limit plate 5 prevents the detector from moving upward, the vertical rod 2 drives the hanging plate 3 to slide outward to squeeze the well wall to stabilize the detector in the well.

[0030] The downhole geophone for geophysical exploration provided in this embodiment is used to detect seismic wave signals in the well. The words related to position and direction involved in this embodiment are relative to the accompanying drawings. Specifically, a signal detection component 6 for detecting signals is fixedly installed at the bottom of the shell 1. The principle of the signal detection component 6 detecting seismic wave signals is the prior art and is not repeated. The vertical rod 2 is elastically slidably plugged with the shell 1 through an elastic mechanism. The role of the elastic sliding plugging of the vertical rod 2 and the shell 1 is: first, the vertical rod 2 can withstand the gravity of the geophone by elastic sliding, and then the vertical rod 2 can be stabilized at a specific height under the action of the gravity of the geophone (such as when the geophone moves downward in the well); second, the vertical rod 2 has space to continue sliding by elastic sliding, so that when the movement of the geophone is blocked, the vertical rod 2 can continue to slide and drive each hanging mechanism (such as when the geophone moves upward in the well). The vertical rod 2 drives each hanging mechanism to operate at the same time. The hanging between the hanging mechanism and the well wall relies on the squeezing force of the hanging plate 3 on the well wall, and the squeezing force of the hanging plate 3 on the well wall comes from the upward movement of the vertical rod 2. The upward movement of the vertical rod 2 relies on the upward pulling force exerted on the suspension rope (not shown in the figure). The central axis of the vertical rod 2 and the suspension rope is located at the center of gravity of the detector, so that when the detector is lowered, the vertical rod 2 and the suspension rope are in a vertical state and on the same straight line at the same time. One end of the suspension rope is located outside the well and connected to a drum (not shown in the figure). The drum can be rotated forward and reversed by manpower (the drum is a rotating roller, which is a prior art and will not be described in detail). The forward and reverse rotation of the drum is used to respectively realize the winding and releasing of the suspension rope. When the suspension rope is wound, an upward pulling force is generated to move the vertical rod 2 upward. When the suspension rope is released, the detector moves downward under the action of the gravity of the detector.The limit plate 5 is elastically rotatably arranged on the hanging plate 3. The elastic force between the limit plate 5 and the hanging plate 3 is smaller than the gravity of the detector. The free end of the limit plate 5 is closer to the well wall than the free end of the hanging plate 3. In the initial state (i.e. when the vertical rod 2 is only affected by the gravity of the detector), the circumscribed circle of each limit plate 5 is directly larger than the diameter of the well, and at the same time, the diameter of the circumscribed circle of each hanging plate 3 is smaller than the diameter of the well, so that when the detector enters the well, the free end of each limit plate 5 abuts against the well wall and under the action of the well wall, the free end of the limit plate 5 tilts upward (the role of the elastic rotation of the limit plate 5 and the hanging plate 3 is to make the free end of the limit plate 5 always abut against the well wall). At the same time Each hanging plate 3 does not contact the well wall, so that the detector can move downward smoothly in the well. In this process, since the free end of each limiting plate 5 is tilted upward, an elastic squeezing force is generated between each limiting plate 5 and the well wall. At this time, the limiting plate 5 plays a role in limiting the detector in the horizontal direction, making it difficult for the detector to collide with the well wall during the downward movement, thereby helping the detector to move downward more smoothly and smoothly when the detector enters the well. A more important function of the limiting plate 5 is that when the detector needs to be hung on the well wall, it can prevent the detector from moving upward, thereby allowing the vertical rod 2 to move upward to drive each hanging plate 3 to squeeze the well wall. The working principle of the downhole geophone for geophysical exploration provided by the present invention is as follows: first, the geophone is vertically suspended at the wellhead, and the suspension rope is released by rotating the drum to allow the geophone to enter the well. At this time, the free end of each limit plate 5 contacts the well wall, and the free end of each limit plate 5 elastically rotates upward, and each hanging plate 3 does not contact the well wall. Under the action of gravity, the geophone moves downward continuously, and when it moves downward to a set height, the suspension rope is stopped from being released, and the suspension rope is started to be wound up, and the suspension rope generates a vertical upward pulling force on the vertical rod 2. At this time, since the free end of each limit plate 5 is in an upwardly inclined state and abuts against the well wall, When the detector is blocked by the limit plate 5, the detector cannot move upward, and as the suspension rope is reeled in, the upward pulling force on the vertical rod 2 gradually increases, causing the vertical rod 2 to slide upward a certain distance (because the vertical rod 2 and the shell 1 are elastically slidably connected). At this time, the upward movement of the vertical rod 2 drives each hanging plate 3 to slide outward (that is, slide toward the well wall) until the free end of each hanging plate 3 firmly presses the well wall. At this time, under the action of the squeezing force between the hanging plate 3 and the well wall, the detector is stably hung on the well wall, and then the signal detection operation is performed (the signal detection operation is a prior art and will not be repeated). In the prior art, since the hanging mechanism needs to be driven by a micro air pump, and the operation of the micro air pump requires electrical support, if the power supply that provides power to the micro air pump is out of power during the survey or there is a short circuit or other fault in the power line, it will lead to the inability to provide power support for the micro air pump and the hanging mechanism will be unable to operate. It can be seen that in the prior art, the operating conditions of the hanging mechanism are restricted, and the hanging mechanism will be unable to be used without electrical support.The main innovation of the present invention is that the hanging mechanism can be activated by pulling up the suspension rope to realize the hanging of the detector. Since one end of the suspension rope is located outside the wellhead, it can be operated manually and the hanging mechanism can be driven without power support.

[0031] When the lifting device is in motion, the lifting plate 5 is lifted up and the lifting plate 5 is lifted up, so that the lifting device 5 can be lifted up and the lifting plate 5 can be lifted up. Compared with the prior art, the present invention can activate each hanging mechanism by only pulling the suspension rope upwards, so that each hanging plate 3 squeezes the well wall at the same time. Under the action of the squeezing force, the detector is stably hung on the well wall without the need for electrical support, so that the hanging mechanism can still be used without electrical support.

[0032] In this embodiment, the hanging mechanism includes a crank arm 14, one end of which is rotatably connected to the vertical rod 2 and the other end of which is rotatably connected to the hanging plate 3. The hanging plate 3 is fixedly mounted with an axle pin 303 that is rotatably plugged with the crank arm 14. When the detector enters the well, the crank arm 14 tilts upward from the inside to the outside. Figure 6 and attached Figure 7 , under the action of the elastic mechanism, the crank arm 14 can be tilted upward from the inside to the outside when the detector enters the well. Therefore, by using the design of the crank arm 14, when the vertical rod 2 is pulled upward, the vertical rod 2 drives the end of each crank arm 14 close to the vertical rod 2 to rotate upward, and the vertical rod 2 can only slide in the vertical direction. During the upward rotation of each crank arm 14, the corresponding hanging plate 3 is continuously pushed to slide outward. The free end of the limiting plate 5 has an edge. At this time, each limiting plate 5 rotates upward and The edge of the limit plate 5 is kept in contact with the well wall at all times to prevent the detector from moving up (because the well wall is soil or soil mixed with gravel and stones, the edge of the limit plate 5 will penetrate into the well wall, thereby making the limit plate 5 have the effect of effectively preventing the detector from moving up) until the free end of the hanging plate 3 is firmly pressed against the well wall. At this time, the detector is stably hung on the well wall under the action of each hanging plate 3, and the lifting rope is in a taut state. At this time, do not release the force on the reel to ensure that each hanging plate 3 does not slide inward.

[0033] In this embodiment, a connecting plate 13 is fixedly sleeved on the vertical rod 2 , and grooves 1301 corresponding to the hanging mechanisms are opened on the connecting plate 13 , and a shaft 1302 rotatably plugged with the crank arm 14 is installed in the groove 1301 .

[0034] Among them, the front and rear sides of the hanging plate 3 are symmetrically provided with slide plates 302, and the housing 1 is provided with slide grooves (not shown in the figure) corresponding to each slide plate 302, and the slide plates 302 are horizontally slidably connected with the slide grooves. The sliding connection between the hanging plate 3 and the housing 1 is realized by the sliding connection between the slide plate 302 and the slide groove, and the horizontal sliding between the slide plate 302 and the slide groove makes the hanging plate 3 squeeze the well wall in a horizontal state, thereby increasing the force of the hanging plate 3 squeezing the well wall.

[0035] Furthermore, a plurality of cone columns 304 are fixedly provided on the end surface of the hanging plate 3 close to the well wall so that the free end of each cone column 304 is inserted into the well wall when the hanging plate 3 slides outward, thereby providing stability and firmness for the hanging mechanism to hang on the well wall.

[0036] Among them, a horizontal axis 301 is fixedly installed on the hanging plate 3, and the limiting plate 5 is rotatably plugged with the horizontal axis 301. A torsion spring 4 is arranged between the limiting plate 5 and the horizontal axis 301, and the torsion spring 4 is fixedly connected to the horizontal axis 301. A socket for inserting the torsion spring 4 is provided on the limiting plate 5. The design of the torsion spring 4 enables an elastic rotation connection between the limiting plate 5 and the hanging plate 3. The limiting plate 5 can elastically rotate upward and downward. An avoidance opening is provided on the limiting plate 5 so that when the limiting plate 5 is converted from rotating upward to rotating downward, the cone column 304 will not touch the limiting plate 5.

[0037] In this embodiment, in the initial state, the limit plate 5 and the hanging plate 3 are in a horizontal state under the elastic force of the torsion spring 4. At this time, the torsion spring 4 does not undergo elastic deformation and thus has no elastic force. When the limit plate 5 rotates upward or downward, the torsion spring 4 will deform and generate elastic force, so that the limit plate 5 can always generate an extrusion force between the well wall.

[0038] In this embodiment, the elastic mechanism includes a first seesaw 7 and a second seesaw 8 that are arranged opposite to each other. The ends of the first seesaw 7 and the second seesaw 8 that are close to each other are both rotatably connected to the vertical rod 2 through the rotating shaft 201. The first seesaw 7 is rotatably connected to the housing 1 through the first support rod 702, and the second seesaw 8 is rotatably connected to the housing 1 through the second support rod 802. Elastic members are arranged between the ends of the first seesaw 7 and the second seesaw 8 that are far away from each other and the housing 1. The first seesaw 7 rotates around the first support rod 702, and the second seesaw 8 rotates around the second support rod 802. When the detector is vertically suspended, the vertical rod 2 first moves up, and at the same time, the first rocker plate 7 and the second rocker plate 8 are driven to rotate. At this time, the ends of the first rocker plate 7 and the second rocker plate 8 that are away from each other both rotate downward to squeeze the elastic member to cause elastic deformation, thereby increasing the elastic force of the elastic member. When the elastic force of the elastic member is equal to the gravity of the detector, the vertical rod 2 stops moving up. At this time, the force is balanced and the position of the hanging plate 3 is also fixed. When the detector is blocked by the limit plate 5 and cannot move up, continuing to pull up the vertical rod 2 will cause the elastic member to further undergo elastic deformation, and the elastic force of the elastic member will further increase.

[0039] Furthermore, the elastic member includes a first slide bar 10 and a second slide bar 11 elastically slidably plugged in, the first slide bar 10 is located above the second slide bar 11, the top of the first slide bar 10 is fixedly connected to the horizontal bar 9, the first rocker 7 is provided with a first long hole 701 slidably plugged in with the horizontal bar 9, the second rocker 8 is provided with a second long hole 801 slidably plugged in with the horizontal bar 9, the first long hole 701 and the second long hole 801 are symmetrically arranged, the top surface and the bottom surface of the first long hole 701 and the top surface and the bottom surface of the second long hole 801 are both slidably abutted against the outer surface of the corresponding horizontal bar 9, the length of the first long hole 701 in the left and right direction and the length of the second long hole 801 in the left and right direction are both greater than the diameter of the horizontal bar 9 so that the horizontal bar 9 can slide left and right, and then when the ends of the first rocker 7 and the second rocker 8 that are away from each other are rotated downward, the corresponding horizontal bar 9 can be pressed down to move vertically downward;

[0040] The second slide bar 11 is provided with a cavity for the first slide bar 10 to slide and insert into, and a compression spring 12 is arranged between the cavity of the second slide bar 11 and the bottom of the first slide bar 10. When the horizontal bar 9 moves vertically downward, the horizontal bar 9 drives the first slide bar 10 to slide downward along the cavity of the second slide bar 11, so that the compression spring 12 is compressed to generate elastic force, and the elastic sliding of the vertical bar 2 is realized by the compression spring 12.

[0041] Furthermore, an external thread is provided on the second slide bar 11, the second slide bar 11 is screwed with the shell 1, the bottom of the second slide bar 11 extends to the outside of the shell 1, and the compression spring 12 is placed in the cavity of the second slide bar 11 (that is, the compression spring 12 is not fixedly connected to the cavities of the first slide bar 10 and the second slide bar 11). By rotating the second slide bars 11 located outside the shell 1, the length of the second slide bar 11 located inside the shell 1 can be changed. When the length of the second slide bar 11 located inside the shell 1 increases, the second slide bar 11 will push the compression spring 12 upward so that the compression spring 12 pushes the first slide bar 10 upward. The first slide bar 10 drives the free end of the first rocker 7 and the free end of the second rocker 8 to rotate upward through the horizontal rod 9 until they abut against the inner wall of the shell 1. At this time, To achieve the resetting of the first rocker 7 and the second rocker 8, when the length of the second slide bar 11 located inside the shell 1 continues to increase, the compression spring 12 will be compressed to different degrees, thereby changing the elastic force of the compression spring 12 in the initial state (since the gravity of the detector remains unchanged, when the elastic force of the compression spring 12 in the initial state is relatively small, the vertical rod 2 moves upward a larger distance when the detector is hung down so that the length of each hanging plate 3 extending to the outside of the shell 1 is longer; when the elastic force of the compression spring 12 in the initial state is relatively large, the vertical rod 2 moves upward a smaller distance when the detector is hung down so that the length of each hanging plate 3 extending to the outside of the shell 1 is shorter), thereby changing the length of each hanging plate 3 extending to the outside of the shell 1 in the initial state, so that the hanging mechanism can be suitable for wellheads of different diameters.

[0042] In this embodiment, the elastic rotation arrangement between the hanging plate 3 and the limit plate 5 also produces another unexpected technical effect: since different height layers in the well will be tested during the actual detection process, the hanging mechanism is required to realize multiple hangings. Now, the above working principle is continued to be described. When the free end of the hanging plate 3 is firmly pressed against the well wall, the detector is stably hung on the well wall under the action of each hanging plate 3, and then the hanging rope is continued to be wound to make the vertical rod 2 continue to move upward (see the attached Figure 7 To Attachment Figure 8), at this time, the first seesaw 7 and the second seesaw 8 continue to rotate to make the compression spring 12 continue to be compressed, and each crank arm 14 gradually changes from tilting upward from the inside to the outside to tilting upward from the outside to the inside. In this process, the limit plate 5 always limits the upward movement of the detector. At this time, the cone column 304 moves out from the well wall until the squeezing force between each hanging plate 3 and the well wall disappears, and then each limit plate 5 rotates downward to the bottom of the cone column 304 under the action of the well wall. At this time, the limit plate 5 cannot prevent the detector from moving upward, that is, the detector can move upward from the well. When it is not necessary to detect again, the detector can be directly taken out. When it is necessary to continue the detection, the detector moves up to After the height is set, the winding of the lifting rope is stopped. At this time, the detector cannot move downward due to the action of the limit plates 5, and the end of the first rocker plate 7 and the second rocker plate 8 that is close to each other has a downward rotation force due to the action of the compression spring 12, so that the vertical rod 2 generates a downward force so that the cone column 304 on each hanging plate 3 generates a squeezing force on the well wall. At this time, the detector can be stably hung on the well wall. In the subsequent process, the detector can be hung at will (when the vertical rod 2 is stopped, the detector can be hung in time) and pulled and moved (when the vertical rod 2 is pulled up, the detector can move upward), so that multi-layer detection can be carried out. It can be seen that the limit plate 5 has the function of preventing the detector from moving downward, so that the detector can not only smoothly enter the well for docking without the use of power support, but also can be passively unhooked and taken out of the well, and the detector can be stopped and hung during the removal process; at the same time, the force on the reel can be released during detection, and under the action of the limit plate 5 and the hanging plate 3, the detector can still be stably hung in the well to reduce the burden on the operator.

[0043] In this embodiment, the housing 1 includes a top cover 101, a middle plate 102 and a bottom cover 103 arranged in sequence from top to bottom. There are multiple middle plates 102 and they correspond to the hanging plates 3 one by one. The top cover 101, the middle plate 102 and the bottom cover 103 are connected by screws (not shown in the figure). The top of the middle plate 102 is provided with a first activity space 1021, and the bottom thereof is provided with a second activity space 1022. The hanging mechanism is located in the first activity space 1021, the first seesaw 7 and the second seesaw 8 are located in the second activity space 1022, the first activity space 1021 and the second activity space 1022 are not connected, and the vertical rod 2 slides through the first activity space 1021, the second activity space 1022 and the top cover 101, so that the vertical rod 2 slides more smoothly. The top cover 101, the middle plate 102 and the bottom cover 103 of the housing 1 are designed to facilitate the installation of the detector.

[0044] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A downhole geophone for geophysical exploration, comprising a housing (1), characterized in that: A hanging rod (2) connected to a hanging rope is elastically and slidably inserted in the shell (1) through an elastic mechanism, and a plurality of hanging mechanisms are arranged in a circumferential array on the hanging rod (2), wherein the hanging mechanism comprises a hanging plate (3) which is transmission-connected to the hanging rod (2) and slides through the shell (1), and a limit plate (5) which is elastically and rotatably arranged on the hanging plate (3) and abuts against the well wall, and the free end of the limit plate (5) is tilted upwards during the process of the detector entering the well, and when the hanging rope is pulled upwards so that the limit plate (5) prevents the detector from moving upwards, the hanging rod (2) drives the hanging plate (3) to slide outwards to press against the well wall so that the detector is stabilized in the well; the elastic mechanism comprises a first seesaw (7) and a second seesaw (8) which are arranged opposite to each other, and the ends of the first seesaw (7) and the second seesaw (8) which are close to each other are both rotationally connected to the hanging rod (2) through a rotating shaft (201), and the first seesaw (7) is connected to the hanging rod (2) through a first support rod (702). The housing (1) is rotatably connected, the second seesaw (8) is rotatably connected to the housing (1) via a second support rod (802), and elastic members are arranged between the ends of the first seesaw (7) and the second seesaw (8) that are away from the housing (1); the elastic member comprises a first slide bar (10) and a second slide bar (11) that are elastically slidably plugged, the first slide bar (10) is located above the second slide bar (11), the top of the first slide bar (10) is fixedly connected to a horizontal bar (9), the first seesaw (7) is provided with a first long hole (701) that is slidably plugged with the horizontal bar (9), and the second seesaw (8) is provided with a second long hole (801) that is slidably plugged with the horizontal bar (9); the second slide bar (11) is provided with a cavity for the first slide bar (10) to be slidably inserted, and a compression spring (12) is arranged between the cavity of the second slide bar (11) and the bottom of the first slide bar (10).

2. The downhole geophone for geophysical exploration according to claim 1, characterized in that: The hanging mechanism comprises a crank arm (14) having one end rotatably connected to the vertical rod (2) and the other end rotatably connected to the hanging plate (3). The crank arm (14) tilts upward from the inside to the outside during the process of the detector entering the well.

3. The downhole geophone for geophysical exploration according to claim 2, characterized in that: A connecting plate (13) is fixedly sleeved on the vertical rod (2), and grooves (1301) corresponding to the respective hanging mechanisms are formed on the connecting plate (13), and a shaft (1302) rotatably plugged with the crank arm (14) is installed in the groove (1301).

4. The downhole geophone for geophysical exploration according to claim 1, characterized in that: Slide plates (302) are symmetrically arranged on the front and rear sides of the hanging plate (3), and the housing (1) is provided with slide grooves corresponding to the slide plates (302) one by one, and the slide plates (302) are horizontally slidably connected to the slide grooves.

5. The downhole geophone for geophysical exploration according to claim 1, characterized in that: A plurality of cone columns (304) are fixedly arranged on the end surface of the hanging plate (3) close to the well wall so that the free end of each cone column (304) is inserted into the well wall when the hanging plate (3) slides outwards.

6. The downhole geophone for geophysical exploration according to claim 1, characterized in that: A transverse axis (301) is fixedly mounted on the hanging plate (3), the limiting plate (5) is rotatably plugged into the transverse axis (301), and a torsion spring (4) is provided between the limiting plate (5) and the transverse axis (301).

7. The downhole geophone for geophysical exploration according to claim 6, characterized in that: In the initial state, the limit plate (5) and the hanging plate (3) are in a horizontal state under the elastic force of the torsion spring (4).

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