Multifunctional perforating gun for oil field downhole operation

Abstract

The invention relates to the field of oilfield development, and discloses a multifunctional perforating gun for oilfield downhole operation, which comprises a sleeve, a gun body is arranged in the sleeve, a pressure relief mechanism is arranged on the left side of the sleeve, the pressure relief mechanism is used for facilitating pressure relief during perforation, and protection mechanisms are arranged on the left side and the right side of the gun body. The protection mechanism is used for conveniently providing protection for the device, a plurality of installation mechanisms are arranged on the periphery of the outer side of the casing pipe at equal intervals, and the installation mechanisms are used for facilitating perforation work of the device. The blocking piece is pushed by high-pressure air flow to move leftwards, the pressure relief hole can conduct pressure relief work on the high-pressure air flow, after pressure relief is completed, the blocking piece is pushed by the first spring to move rightwards, and therefore the pressure relief hole is sealed, silt cannot enter the interior of the casing pipe, pressure relief work is conducted on the interior of the casing pipe through the pressure relief hole, and the service life of the casing pipe is prolonged. Therefore, the sleeve is not deformed due to excessive pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, and specifically relates to a multifunctional perforating gun for downhole operations in oilfields. Background Art

[0002] Downhole operations in oilfields refer to a series of construction operations carried out in the wellbores of oil and water wells with the aid of professional equipment and technologies. When a new well is put into production, downhole operations need to complete perforation and fracturing work to open up the channel for crude oil to flow from the oil layer into the wellbore, helping the new well to produce crude oil smoothly. It is an important means to ensure the continuous, stable and efficient production of oilfields and improve the oil recovery rate.

[0003] In the completion stage, after drilling operations, the formation of the wellbore wall is blocked by mud invasion, and a channel between the wellbore and the oil and gas reservoir needs to be constructed so that the oil and gas in the reservoir can flow smoothly into the wellbore. However, traditional drilling methods and technologies can no longer meet the needs of users due to low efficiency. At this time, a multifunctional perforating gun for downhole operations in oilfields is required.

[0004] Currently, the multifunctional perforating guns for downhole operations in the market mainly consist of a gun body, perforating charges, and a casing. When in use, the perforating gun is first placed downhole. The gun body can control the firing of the perforating charges, and the casing can provide protection for the device. However, when this device is in use, due to the instantaneous huge pressure pulse generated by the explosion of the perforating charges, it will cause serious disturbance to the wellbore wall and the formation around the wellbore, and will trigger the collapse of the wellbore wall. To solve the above problems, the prior art often adopts the method of adding a buffer device between the gun body and the casing to reduce the disturbance of the perforating gun. However, in the actual use process of this device, due to the high-pressure gas generated by the explosion of the perforating charges, it will cause the casing and the gun body to deform, reducing the practicality of the device and not meeting the needs of users. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a multifunctional perforating gun for downhole operations in oilfields, which solves the problem that the multifunctional perforating gun for downhole operations in oilfields will deform under extremely high pressure when in use.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A multifunctional perforating gun for downhole operations in oilfields includes a casing, a gun body is arranged inside the casing, a pressure relief mechanism is arranged on the left side of the casing, the pressure relief mechanism is used to facilitate the pressure relief work during perforation, protection mechanisms are arranged on both the left and right sides of the gun body, the protection mechanisms are used to facilitate the protection of the device, and a plurality of installation mechanisms are equidistantly arranged around the outer side of the casing, and the installation mechanisms are used to facilitate the perforation work of the device; The pressure relief mechanism includes a protective cover, the protective cover is fixedly connected to the left side of the sleeve, a fixed rod is fixedly connected to the left end inside the protective cover, a movable plate is slidably connected to the outer side of the fixed rod, U-shaped rods are fixedly connected to the upper and lower sides of the right wall of the movable plate, pressure relief holes are formed in the upper and lower sides inside the protective cover, baffles are arranged inside the two pressure relief holes, the right sides of the two baffles are respectively fixedly connected to the corresponding U-shaped rods, and a reset assembly is arranged on the outer side of the fixed rod.

[0007] Preferably, the protection mechanism includes a bottom cover, the bottom cover is threadedly connected to the right end of the sleeve, a support plate is fixedly connected to the right side inside the protective cover, hollow tubes are fixedly connected to the adjacent sides of the support plate and the bottom cover, second springs are fixedly connected to the ends of the two hollow tubes away from each other, sliding rods are fixedly connected to the adjacent ends of the two second springs, support discs are fixedly connected to the adjacent ends of the two sliding rods, and a fixing assembly is arranged on the adjacent sides of the two support discs.

[0008] Preferably, the installation mechanism includes fixing rings, a plurality of fixing rings are respectively equidistantly fixedly connected to the outer periphery of the sleeve, grooves are formed in the front and rear sides inside the plurality of fixing rings, clamping blocks are slidably connected to the inside of the plurality of grooves, a plurality of holes are equidistantly formed in the outer periphery of the sleeve, plugs are arranged inside the plurality of holes, the plurality of plugs are respectively engaged with the corresponding clamping blocks, a limiting assembly is arranged on one side of the plurality of clamping blocks, and a plurality of perforating assemblies are equidistantly fixedly connected to the outer periphery of the gun body.

[0009] Preferably, the reset assembly includes a first spring, the first spring is arranged on the outer side of the fixed rod, the right side of the first spring is fixedly connected to the movable plate, and a fixed block is fixedly connected to the right end of the fixed rod.

[0010] Preferably, the fixing assembly includes cross-shaped inserts, the two cross-shaped inserts are respectively fixedly connected to the adjacent sides of the two support discs, connection blocks are fixedly connected to the left and right sides of the gun body, slots are formed in the sides of the two connection blocks away from each other, and the two cross-shaped inserts are respectively engaged with the corresponding slots.

[0011] Preferably, the limiting assembly includes connecting rods, a plurality of connecting rods are respectively fixedly connected to one side of the clamping blocks, reset springs are arranged on the outer sides of the plurality of connecting rods, one ends of the plurality of reset springs are respectively fixedly connected to the corresponding clamping blocks, and one ends of the plurality of connecting rods respectively penetrate through the corresponding fixing rings and are fixedly connected to limiting blocks.

[0012] Preferably, the perforating assembly includes mounting posts, a plurality of mounting posts are respectively equidistantly fixedly connected to the outer periphery of the gun body, and perforating bullets are fixedly connected to one side of the plurality of mounting posts.

[0013] Preferably, the bottoms of the plurality of plugs are in contact with corresponding perforating bullets respectively, and the inner size of the block matches the size of the plug.

[0014] Preferably, a connecting column is fixedly connected to the right side of the bottom cover, and a connecting thread is provided on the outer side of the connecting column.

[0015] Preferably, a mounting block is fixedly connected to the upper side of the left wall of the bottom cover, and a sensor is fixedly connected to the left side of the mounting block.

[0016] The present invention provides a multifunctional perforating gun for oil field downhole operations. It has the following beneficial effects: 1. The present invention pushes the baffle to move leftward by high-pressure airflow, and the pressure relief hole can relieve the pressure of the high-pressure airflow. After the pressure relief is completed, the first spring pushes the movable plate to move rightward, and the U-shaped rod can pull the baffle to move rightward, thereby closing the pressure relief hole, so that mud and sand cannot enter the inside of the casing. The pressure relief work is performed on the inside of the casing through the pressure relief hole, so that the casing will not be deformed due to excessive pressure, thereby improving the practicality of the device and meeting the needs of users.

[0017] 2. The present invention pushes the connecting block to move by the gun body, and the support plate pushes the slide bar to move accordingly. The movement of the slide bar squeezes the second spring, causing the second spring to contract and absorb the impact on the gun body, so that the gun body will not be damaged due to excessive impact force, and the gun body can be fixed by engaging the cross plug block with the slot, so that the gun body will not deflect, thereby improving the reliability of the device.

[0018] 3. The present invention can fix the plug by pressing the plug into the hole, and the reset spring will push the block to engage with the plug. When perforating, the perforating bullet will emit a high-pressure jet, which can push the plug out, so that the oil field well can be perforated. The casing will not be damaged during perforation, so that the casing can be reused, which improves the convenience of using the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of the present invention; Figure 2 It is a structural cross-sectional view of the present invention; Figure 3 for Figure 2 A in the enlarged view; Figure 4 It is a cross-sectional view of the protective cover structure of the present invention; Figure 5 It is a structural disassembly diagram of the protection mechanism of the present invention; Figure 6 It is a cross-sectional view of the hollow tube structure of the present invention; Figure 7 The structural exploded view of the installation mechanism of the present invention; Figure 8 The cross-sectional view of the fixed ring structure of the present invention.

[0020] Wherein, 1, sleeve; 2, pressure relief mechanism; 201, protective cover; 202, fixed rod; 203, movable plate; 204, first spring; 205, fixed block; 206, U-shaped rod; 207, pressure relief hole; 208, retaining piece; 3, protection mechanism; 301, bottom cover; 302, support plate; 303, hollow tube; 304, second spring; 305, sliding rod; 306, support disc; 307, cross-shaped insert block; 308, connecting block; 309, card slot; 310, mounting block; 311, sensor; 312, connecting column; 313, connecting thread; 4, installation mechanism; 401, fixed ring; 402, groove; 403, clamping block; 404, hole; 405, plug; 406, connecting rod; 407, return spring; 408, installation column; 409, perforating cartridge; 410, limiting block; 5, gun body. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Referring to Figure 1 , Figure 2 and Figure 4 , an embodiment of the present invention provides a multifunctional perforating gun for oilfield downhole operations, including a sleeve 1. A gun body 5 is arranged inside the sleeve 1. A pressure relief mechanism 2 is arranged on the left side of the sleeve 1. The pressure relief mechanism 2 is used to facilitate the pressure relief work during perforation. Protection mechanisms 3 are arranged on both the left and right sides of the gun body 5. The protection mechanisms 3 are used to facilitate the protection of the device. A plurality of installation mechanisms 4 are evenly arranged at equal intervals around the outer side of the sleeve 1. The installation mechanisms 4 are used to facilitate the perforation work of the device; The pressure relief mechanism 2 includes a protective cover 201. The protective cover 201 is fixedly connected to the left side of the casing 1. At the left end inside the protective cover 201, there is a fixed rod 202 fixedly connected. A movable plate 203 is slidably connected to the outer side of the fixed rod 202. The movable plate 203 can slide on the outer side of the fixed rod 202. On the upper and lower sides of the right wall of the movable plate 203, there are U-shaped rods 206 fixedly connected respectively. The movable plate 203 can drive the U-shaped rods 206 to move. Pressure relief holes 207 are provided on the upper and lower sides inside the protective cover 201. The pressure relief holes 207 can relieve the pressure inside the casing 1. Inside both of the two pressure relief holes 207, there are shutter plates 208 provided. The right sides of the two shutter plates 208 are fixedly connected to the corresponding U-shaped rods 206 respectively. The U-shaped rods 206 can drive the shutter plates 208 to move. A reset assembly is provided on the outer side of the fixed rod 202. The reset assembly includes a first spring 204. The first spring 204 is arranged on the outer side of the fixed rod 202. The right side of the first spring 204 is fixedly connected to the movable plate 203. The first spring 204 can push the movable plate 203 to move. A fixed block 205 is fixedly connected to the right end of the fixed rod 202. The fixed block 205 can limit the movement of the movable plate 203.

[0023] In the present invention, when using this device for perforation operation, high pressure will be generated inside the casing 1. The high-pressure air flow will push the shutter plate 208 to move leftward. When the shutter plate 208 moves leftward, the high-pressure air flow can effectively relieve the pressure through the pressure relief holes 207. And when the pressure inside the casing 1 drops to a certain extent, the first spring 204 will push the movable plate 203 to move rightward, so that the U-shaped rod 206 can pull the shutter plate 208 to move it rightward. When the shutter plate 208 moves rightward, it can close the pressure relief holes 207 to prevent sediment from entering the inside of the casing 1, ensuring that the pressure relief holes 207 can be opened for pressure relief when needed and remain closed when not needed, thereby protecting the casing 1 from excessive pressure and avoiding its deformation, ensuring the safety and effectiveness of the entire perforation operation, improving the practicability of this device, and meeting the needs of users.

[0024] Refer to Figure 3 、 Figure 5 and Figure 6, the protection mechanism 3 includes a bottom cover 301 which is threadedly connected to the right end of the sleeve 1. A support plate 302 is fixedly connected to the inner right side of the protective cover 201. Hollow tubes 303 are fixedly connected to the adjacent sides of the support plate 302 and the bottom cover 301. Second springs 304 are fixedly connected to the ends of the two hollow tubes 303 away from each other. The second springs 304 can reduce the impact on the gun body 5, so that the gun body 5 will not be damaged due to excessive pressure. The adjacent ends of the two second springs 304 are fixedly connected to sliding rods 305. When the sliding rods 305 move, they will squeeze the second springs 304. The adjacent ends of the two sliding rods 305 are fixedly connected to support discs 306. The support discs 306 can drive the sliding rods 305 to move. Fixing components are arranged on the adjacent sides of the two support discs 306. The fixing components include cross-shaped inserts 307. The two cross-shaped inserts 307 are respectively fixedly connected to the adjacent sides of the two support discs 306. Connecting blocks 308 are fixedly connected to the left and right sides of the gun body 5. Slots 309 are formed on the sides of the two connecting blocks 308 away from each other. The two cross-shaped inserts 307 are respectively engaged with the corresponding slots 309. When the cross-shaped insert 307 is engaged with the slot 309, the gun body 5 can be fixed, so that the gun body 5 will not shift.

[0025] In the present invention, when using this device for perforating work, when the gun body 5 is subjected to the strong impact generated by perforating, it will move accordingly and drive the connecting block 308 to move. The connecting block 308 can push the sliding rod 305 to move through the support disc 306. During the movement of the sliding rod 305, it will apply pressure to the second spring 304, causing the second spring 304 to be compressed. During the compression process of the second spring 304, it will absorb and store energy, thus playing a buffering role and reducing the impact on the gun body 5 to prevent the gun body 5 from being damaged due to excessive impact. In addition, during the installation of the gun body 5, the gun body 5 needs to be placed inside the sleeve 1, and the cross-shaped insert 307 is engaged with the slot 309, then the gun body 5 can be fixed, so that the gun body 5 will not shift, improving the reliability of this device.

[0026] Refer to Figure 2 , Figure 7 and Figure 8, the installation mechanism 4 includes a fixing ring 401. A plurality of fixing rings 401 are respectively and equidistantly fixedly connected to the outer periphery of the sleeve 1. Grooves 402 are formed in the front and rear sides of the interiors of the plurality of fixing rings 401. A clamping block 403 is slidably connected inside the plurality of grooves 402. The clamping block 403 can slide inside the groove 402. A plurality of holes 404 are equidistantly formed in the outer periphery of the sleeve 1. Plug heads 405 are arranged inside the plurality of holes 404. The plug heads 405 can close the holes 404. The plurality of plug heads 405 are respectively engaged with the corresponding clamping blocks 403. The clamping block 403 can fix the plug head 405. A limiting component is arranged on one side of each of the plurality of clamping blocks 403. A plurality of perforating components are respectively and equidistantly fixedly connected to the outer periphery of the gun body 5. The limiting component includes a connecting rod 406. The plurality of connecting rods 406 are respectively fixedly connected to one side of the clamping block 403. The connecting rod 406 can drive the clamping block 403 to move. A return spring 407 is arranged on the outer side of each of the plurality of connecting rods 406. One ends of the plurality of return springs 407 are respectively fixedly connected to the corresponding clamping blocks 403. The return spring 407 can push the clamping block 403 to engage with the plug head 405. One ends of the plurality of connecting rods 406 respectively penetrate through the corresponding fixing rings 401 and are fixedly connected with a limiting block 410. The limiting block 410 can limit the movement of the connecting rod 406. The perforating component includes a mounting post 408. The plurality of mounting posts 408 are respectively and equidistantly fixedly connected to the outer periphery of the gun body 5. A perforating bullet 409 is fixedly connected to one side of each of the plurality of mounting posts 408. The perforating bullet 409 can be used for perforating work.

[0027] In the present invention, when using this device, first install the gun body 5 inside the sleeve 1, and press the plug head 405 into the hole 404. The plug head 405 will push the clamping block 403 to move. The movement of the clamping block 403 will compress the return spring 407. After the plug head 405 completely enters the hole 404, the return spring 407 will push the clamping block 403 to engage with the plug head 405, thereby fixing the plug head 405 inside the hole 404. When performing the perforating operation, the perforating bullet 409 will emit a high-pressure jet to push the plug head 405 out of the hole 404, completing the perforating operation, so that the sleeve 1 will not be damaged due to the perforating work, enabling the sleeve 1 to be reused, and improving the convenience of using this device.

[0028] Refer to Figure 7 and Figure 8 , the bottoms of the plurality of plug heads 405 are respectively in contact with the corresponding perforating bullets 409. The perforating bullet 409 can push the plug head 405 out during perforating. The inner size of the clamping block 403 matches the size of the plug head 405.

[0029] In the present invention, during the perforation operation, the perforating charge 409 emits a high-pressure jet, which flushes out the plug 405 from the hole 404 to perform the perforation operation on the oilfield well. The inner size of the clamping block 403 matches the size of the plug 405, so that the plug 405 does not shake inside the hole 404.

[0030] Referring to Figure 1 、 Figure 2 and Figure 3 , a connecting column 312 is fixedly connected to the right side of the bottom cover 301. A connecting thread 313 is arranged on the outer side of the connecting column 312. The connecting thread 313 can be used to conveniently fix the device to external equipment. An installation block 310 is fixedly connected to the upper side of the left wall of the bottom cover 301. A sensor 311 is fixedly connected to the left side of the installation block 310. The sensor 311 can monitor the internal situation of the device.

[0031] In the present invention, the device can be conveniently connected to external equipment through the connecting thread 313 on the outer side of the connecting column 312, and the internal situation of the casing 1 can be continuously monitored conveniently by using the sensor 311.

[0032] Working principle: When using this device for perforation operation, high pressure will be generated inside the casing 1. The high-pressure air flow will push the baffle 208 to move leftward. When the baffle 208 moves leftward, the high-pressure air flow will perform pressure relief work through the pressure relief hole 207. And when the pressure inside the casing 1 is relatively small, the first spring 204 will push the movable plate 203 to move rightward. The movable plate 203 will then pull the baffle 208 to move rightward through the U-shaped rod 206, and the baffle 208 can close the pressure relief hole 207, so that sediment will not enter the inside of the casing 1, and the pressure relief hole 207 can be used to perform pressure relief work on the inside of the casing 1, so that the casing 1 will not be deformed due to excessive pressure; When using this device for perforation operation, the gun body 5 will move under the impact of the explosion, thus pushing the connecting block 308 to move. The connecting block 308 can push the sliding rod 305 to move through the support plate 306. When the sliding rod 305 moves, it will squeeze the second spring 304. The second spring 304 will contract when being squeezed and absorb the impact received by the gun body 5, so that the gun body 5 will not be damaged due to excessive impact force. And when installing the gun body 5, place the gun body 5 inside the casing 1 and engage the cross-shaped insert 307 with the card slot 309, then the gun body 5 can be fixed and the gun body 5 will not deflect; When using this device, first install the gun body 5 inside the casing 1, and press the plug 405 into the hole 404. When the plug 405 is pressed in, it will push the block 403 to move and compress the return spring 407. After the plug 405 completely enters the hole 404, the return spring 407 will push the block 403 to engage with the plug 405, so that the plug 405 can be fixed. And when performing the perforation work, the perforating charge 409 will emit a high-pressure jet, thereby pushing the plug 405 out, and the perforation work can be completed. When performing the perforation work, it will not damage the casing 1, so that the casing 1 can be reused.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional perforating gun for downhole operations in an oil field, comprising a casing (1), characterized in that: A gun body (5) is arranged inside the casing (1), a pressure relief mechanism (2) is arranged on the left side of the casing (1), and the pressure relief mechanism (2) is used to facilitate pressure relief during perforation. Protection mechanisms (3) are arranged on the left and right sides of the gun body (5), and the protection mechanisms (3) are used to facilitate protection of the device. A plurality of mounting mechanisms (4) are arranged at equal intervals around the outer side of the casing (1), and the mounting mechanisms (4) are used to facilitate perforation of the device. The pressure relief mechanism (2) comprises a protective cover (201), the protective cover (201) being fixedly connected to the left side of the sleeve (1), a fixed rod (202) being fixedly connected to the left end of the interior of the protective cover (201), a movable plate (203) being slidably connected to the outside of the fixed rod (202), U-shaped rods (206) being fixedly connected to the upper and lower sides of the right wall of the movable plate (203), pressure relief holes (207) being provided on the upper and lower sides of the interior of the protective cover (201), baffles (208) being provided inside the two pressure relief holes (207), the right sides of the two baffles (208) being fixedly connected to the corresponding U-shaped rods (206), and a reset assembly being provided on the outside of the fixed rod (202).

2. A multifunctional perforating gun for oilfield downhole operations according to claim 1, characterized in that: The protection mechanism (3) comprises a bottom cover (301), the bottom cover (301) being threadedly connected to the right end of the sleeve (1), a support plate (302) being fixedly connected to the right side of the interior of the protection cover (201), a hollow tube (303) being fixedly connected to the adjacent sides of the support plate (302) and the bottom cover (301), a second spring (304) being fixedly connected to the inner ends of the two hollow tubes (303) away from each other, a sliding rod (305) being fixedly connected to the adjacent ends of the two second springs (304), a supporting plate (306) being fixedly connected to the adjacent ends of the two sliding rods (305), and a fixing component being provided on the adjacent sides of the two supporting plates (306).

3. The multifunctional perforating gun for oilfield downhole operations according to claim 1, characterized in that: The mounting mechanism (4) comprises a fixing ring (401), wherein a plurality of the fixing rings (401) are fixedly connected to the outer periphery of the casing (1) at equal intervals, grooves (402) are provided on the front and rear sides of the interiors of the plurality of fixing rings (401), and a clamping block (403) is slidably connected inside the plurality of grooves (402), a plurality of holes (404) are provided at equal intervals on the outer periphery of the casing (1), a plug (405) is provided inside the plurality of holes (404), and the plurality of plugs (405) are respectively engaged with corresponding clamping blocks (403), and a limiting component is provided on one side of the plurality of clamping blocks (403), and a plurality of perforating components are fixedly connected to the outer periphery of the gun body (5) at equal intervals.

4. The multifunctional perforating gun for oilfield downhole operations according to claim 1, characterized in that: The reset assembly comprises a first spring (204), the first spring (204) being arranged on the outside of the fixed rod (202), the right side of the first spring (204) being fixedly connected to the movable plate (203), and the right end of the fixed rod (202) being fixedly connected to a fixed block (205).

5. The multifunctional perforating gun for oilfield downhole operations according to claim 2, characterized in that: The fixing assembly comprises a cross plug block (307), wherein the two cross plug blocks (307) are respectively fixedly connected to adjacent sides of the two support plates (306), and the left and right sides of the gun body (5) are both fixedly connected with connecting blocks (308), and the two connecting blocks (308) are each provided with a slot (309) on a side away from each other, and the two cross plug blocks (307) are respectively engaged with the corresponding slots (309).

6. The multifunctional perforating gun for oilfield downhole operations according to claim 3, characterized in that: The limit assembly comprises a connecting rod (406), wherein a plurality of the connecting rods (406) are respectively fixedly connected to one side of a clamping block (403), a return spring (407) is arranged on the outer side of the plurality of connecting rods (406), one end of the plurality of return springs (407) is respectively fixedly connected to the corresponding clamping block (403), and one end of the plurality of connecting rods (406) respectively passes through the corresponding fixing ring (401) and is fixedly connected to the limit block (410).

7. The multifunctional perforating gun for oilfield downhole operations according to claim 3, characterized in that: The perforating assembly comprises a mounting column (408), wherein a plurality of the mounting columns (408) are fixedly connected to the outer periphery of the gun body (5) at equal distances, and a perforating bullet (409) is fixedly connected to one side of each of the plurality of mounting columns (408).

8. The multifunctional perforating gun for oilfield downhole operations according to claim 7, characterized in that: The bottoms of the plurality of plugs (405) are respectively in contact with corresponding perforating bullets (409), and the size of the inner side of the block (403) matches the size of the plugs (405).

9. The multifunctional perforating gun for oilfield downhole operations according to claim 2, characterized in that: A connecting column (312) is fixedly connected to the right side of the bottom cover (301), and a connecting thread (313) is provided on the outer side of the connecting column (312).

10. The multifunctional perforating gun for oilfield downhole operations according to claim 2, characterized in that: A mounting block (310) is fixedly connected to the upper side of the left wall of the bottom cover (301), and a sensor (311) is fixedly connected to the left side of the mounting block (310).

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