A multistage perforating initiation delay booster

Abstract

This invention discloses a delayed detonation device for multi-stage perforation initiation, relating to the field of multi-stage perforation technology. It aims to solve the technical problem of insufficient safety isolation in existing delayed detonation devices during the delay waiting phase. The device includes a gun body, a pressure sensor, a perforation projectile system, an initiation system, and an isolation mechanism. The initiation system includes an inner cylinder fitted inside the gun body, a hydraulically driven firing pin fitted inside the inner cylinder, and a percussion cap installed at the bottom of the inner cylinder. This invention achieves reliable isolation and connection of the firing pin's impact path through the convergence and deflection of the assembly blocks in the isolation mechanism. This ensures that the firing pin can directly impact the percussion cap to complete the detonation only when the assembly blocks are deployed, and that the impact path is blocked when the assembly blocks are converged, preventing detonation. This provides an active and controllable mechanical safety isolation method to solve the technical problem of insufficient safety in existing delayed detonation devices during the delay waiting period, caused by accidental triggering or pressure fluctuations leading to premature detonation due to the firing pin accidentally impacting the percussion cap.

Description

Technical Field

[0001] This invention relates to the field of multi-stage perforation technology, and more specifically, to a delayed detonation device for multi-stage perforation initiation. Background Technology

[0002] Currently, the core challenge of delayed detonation devices for multi-stage perforation initiation lies in ensuring both precise and reliable delay control and absolute operational safety in complex and harsh downhole environments.

[0003] Existing technologies have significant safety and reliability issues in the delayed waiting phase of multi-stage perforation operations. Traditional detonation devices often rely on electronic delay or single hydraulic control, lacking an effective physical isolation mechanism. When downhole pressure fluctuates abnormally, sensors misjudge, or the system is interfered with, the firing pin may malfunction at an unexpected time, directly impacting the perforation cap and causing the perforation projectile to detonate prematurely. This not only disrupts the detonation sequence and causes the current stage of the operation to fail, but may also lead to gun jamming, tubing damage, and even well control risks, severely restricting the safety and success rate of the operation.

[0004] Existing devices have significant limitations in terms of precise control and response speed of detonation timing. In complex and variable downhole pressure environments, solutions relying on pure hydraulic or electronic delays struggle to achieve high-precision and high-stability delay control, easily leading to delay time drift or detonation asynchrony. Furthermore, the long response delay from receiving the detonation signal to completing the mechanical action negatively impacts the overall efficiency and effectiveness of multi-stage perforation operations. Therefore, we propose a delay-propellant detonation device for multi-stage perforation initiation. Summary of the Invention

[0005] The purpose of this invention is to provide a delayed detonation device for multi-stage perforation initiation, so as to solve the technical problem of insufficient safety isolation in the delayed waiting stage of existing delayed detonation devices.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a delayed detonation device for multi-stage perforation initiation, comprising a gun body, a pressure sensor, a perforation projectile system, an initiation system and an isolation mechanism, wherein the initiation system comprises an inner cylinder sleeved inside the gun body, a hydraulically driven firing pin sleeved inside the inner cylinder, and a percussion cap installed at the bottom of the inner cylinder.

[0007] The isolation mechanism includes a lower mold stationary module and an upper mold moving module, with the upper mold moving module located directly above the lower mold stationary module and capable of moving upward or downward.

[0008] The lower mold stationary module includes an I-beam sleeve fitted inside the inner cylinder;

[0009] The upper surface of the I-beam is fixedly connected with several support plates in a ring array, and the support plates form a radial solid partition between the I-beams along their thickness direction.

[0010] Each of the support plates is equipped with an arc-shaped slider on its upper surface, and the arc-shaped slider has an elastic reset function.

[0011] Each of the arc-shaped sliders has a sliding adaptation block on its inner wall, and the combination block has a downward elastic movement tendency.

[0012] The end of the combined block is snapped onto the solid partition formed by the support plate;

[0013] When the aforementioned arc-shaped sliders move, they can cause the corresponding combination blocks to gather or unfold.

[0014] When several blocks are brought together, their upper surfaces together form a circular conical hole, and the shape of the circular conical hole matches the impact end of the firing pin.

[0015] When several assembly blocks converge, the hydraulically driven firing pin moves downward, and the impact end of the firing pin inserts into the circular conical hole, thus interrupting the impact path of the firing pin. When the upper mold moving module moves upward, it pushes the arc-shaped slider to slide, causing the assembly blocks to unfold, the circular conical hole to disengage, and the firing pin to strike the cap. This invention achieves reliable interruption and connection of the firing pin's impact path through the convergence and unfolding of the assembly blocks in the isolation mechanism. This ensures that the firing pin can directly strike the cap to complete the detonation only when the assembly blocks are unfolded, and that the impact path is interrupted when the assembly blocks converge, preventing detonation. This provides an active and controllable mechanical safety isolation method to solve the technical problem of insufficient safety in existing delayed detonation devices where the firing pin accidentally strikes the cap during the delay waiting period due to accidental triggering or pressure fluctuations, resulting in premature detonation.

[0016] Preferably, the detonation system further includes a hydraulic module, which is sleeved inside the inner cylinder, and the firing pin is installed at the output end of the hydraulic module.

[0017] Preferably, the lower mold stationary module further includes two vertically coaxial annular frames, which are sleeved inside the inner cylinder. The two annular frames are fixedly connected by several limiting rods. One of the annular frames has a stationary triangular plate sleeved inside, and the I-beam is installed at the center of the stationary triangular plate.

[0018] Preferably, each of the support plates has a waist-shaped groove on its upper surface along its thickness direction, and the waist-shaped groove passes through the corresponding support plate and the stationary triangular plate below.

[0019] Preferably, each of the arc-shaped sliders is fixedly connected to a drive rod at its bottom, the drive rod passes through the waist-shaped slide groove and the stationary triangular plate, and each of the arc-shaped sliders has symmetrically arranged slide rails on its inner wall, and each slide rail has a first spring fixedly connected to its top inner wall.

[0020] Preferably, the slider on the assembly block is slidably adapted to the inside of the slide rail, and the slider on the assembly block is elastically connected to the first spring.

[0021] Preferably, each of the support plates is fitted with a hollow mounting column, and the end of the hollow mounting column passes through the stationary triangular plate. An electromagnet module is arranged at the end of each hollow mounting column. The drive rod is elastically connected to the hollow mounting column through a tension spring, and the tension spring is located between the stationary triangular plate and the support plate.

[0022] Preferably, the upper mold moving module includes a moving triangular plate, which is slidably sleeved on a plurality of limiting rods. Each limiting rod has a second spring sleeved on its surface, and the second spring is elastically connected to one of the annular frames. The bottom of the moving triangular plate is fixedly connected to a permanent magnet module in an annular array, and the permanent magnet module corresponds to the position of the electromagnet module.

[0023] Preferably, the bottom of the moving triangular plate is fixedly connected to a driving plate in a circular array, and the driving plate corresponds to the position of the arc-shaped slider. Each driving plate has an inclined surface on one side, and the arc-shaped slider slides in contact with the inclined surface. Each driving plate has a connecting hole on one side.

[0024] Preferably, a movable ring with a support rod is slidably sleeved on the side surface of the I-beam, and a number of top blocks are fixedly connected in a ring array on the upper surface of the movable ring. A number of through holes are opened in a ring array on the upper surface of the I-beam, and the top blocks are inserted into the through holes and make movable contact with the lower surface of the assembly block. A drive frame is slidably sleeved inside each of the connecting holes.

[0025] When the drive plate moves upward, the inner wall at the bottom of the connecting hole contacts the inner wall at the top of the drive frame, causing the drive plate to move the drive frame upward. Each drive frame has a bent rod fixedly connected to one side, with the end of the bent rod sleeved on the surface of the support rod on the movable ring, and the end of the bent rod and the movable ring forming a lifting fit relationship.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention achieves reliable isolation and connection of the firing pin impact path by the convergence and unfolding of the combination blocks in the isolation mechanism. This allows the firing pin to directly impact the percussion cap to complete the detonation only when the combination blocks are unfolded, and the impact path is blocked and detonation is not possible when the combination blocks are converged. This provides an active and controllable mechanical safety isolation method to solve the technical problem of insufficient safety in existing delayed detonation devices where the firing pin accidentally impacts the percussion cap due to accidental triggering or pressure fluctuations during the delay waiting period, resulting in premature detonation.

[0028] 2. The delayed detonation device of the present invention, through the ingenious mechanical and electromagnetic linkage design of the isolation mechanism, achieves precise and reliable delayed and rapid triggering functions, thereby solving the technical problems of existing perforation devices in terms of difficulty in accurately controlling the detonation sequence under complex pressure environments, insufficient delay stability, and excessively long delay from deflection to detonation response. Its core is as follows: In the standby state, the inclined surface of the drive plate pushes the arc-shaped slider, causing the combined block to converge and be clamped by the pre-tension force of the first spring, forming a reliable mechanical block and effectively isolating the striker and the detonator; when the downhole pressure reaches the preset threshold, the control system triggers the electromagnet module to generate a repulsive force, driving the moving triangular plate and the drive plate to move upward. Through the linkage of the drive frame and the bending rod, the movable ring top block quickly pushes the combined block away from its original position. At the same time, the restoring force of the tension spring assists in quickly pulling the combined block back, instantly releasing the blockage, allowing the hydraulically driven striker to immediately strike the detonator. This "blocking-release" mechanism ensures the stability of the delayed process and the instantaneity of the detonation action.

[0029] 3. This invention realizes intelligent delayed detonation based on real-time downhole pressure sensing. Through the closed loop of pressure sensor and control system, it ensures precise timing of operations, improving the effectiveness of perforation and downhole safety. Secondly, the purely mechanical blocking structure of the isolation mechanism (combination block snapped into the solid partition) has extremely high reliability in the delayed state, can withstand the impact load of the firing pin, and avoids false triggering. Finally, the release mechanism combining electromagnetic drive and spring return has a rapid response and decisive action, ensuring that the delay from receiving the detonation signal to actual detonation is extremely short, meeting the stringent requirements of multi-stage perforation for timing control. The overall structure is compact and integrated into the gun body, making it suitable for complex downhole environments. Attached Figure Description

[0030] Figure 1 This is a three-dimensional cross-sectional view of the present invention to show the internal structure of the gun body;

[0031] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the overall structure of the isolation mechanism of the present invention;

[0033] Figure 4 This is a three-dimensional partial structural diagram of the isolation mechanism of the present invention;

[0034] Figure 5 This is a three-dimensional structural diagram of the lower mold static module of the present invention;

[0035] Figure 6 This is a three-dimensional structural diagram of the upper mold moving module of the present invention;

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of the bending rod of the present invention;

[0037] Figure 8 This is a schematic diagram of the three-dimensional exploded structure of the combined block of the present invention;

[0038] Figure 9 This is a schematic diagram of the three-dimensional structure of the drive board of the present invention;

[0039] Figure 10 This is a schematic cross-sectional view of the drive board structure of the present invention;

[0040] Figure 11 This is a schematic diagram of the structure of the firing pin and the firing cap in isolation during use, according to the present invention.

[0041] Figure 12 This is a schematic diagram of the delayed perforation structure in use according to the present invention. Figure 1 ;

[0042] Figure 13 This is a schematic diagram of the delayed perforation structure in use according to the present invention. Figure 2 ;

[0043] Figure 14 This is a schematic diagram of the operating state of the firing pin of the present invention.

[0044] The labels in the diagram are as follows: 1. Gun body; 11. Pressure sensor; 2. Perforation projectile system; 3. Detonation system; 31. Inner cylinder; 32. Hydraulic module; 33. Firing pin; 34. Percussion cap; 4. Isolation mechanism; 41. Lower mold stationary module; 411. Ring frame; 4111. Limiting rod; 412. Stationary triangle plate; 4121. I-beam; 413. Support plate; 414. Waist-shaped slide groove; 415. Arc-shaped slider; 4151. Drive rod; 4152. 4153. Slide rail; 4154. First spring; 4155. Combination block; 416. Hollow mounting column; 417. Electromagnet module; 418. Tension spring; 419. Upper mold moving module; 420. Moving triangle plate; 421. Second spring; 422. Permanent magnet module; 423. Drive plate; 424. Inclined surface; 4242. Connecting hole; 425. Movable ring; 4251. Top block; 426. Through hole; 427. Drive frame; 428. Bending rod. Detailed Implementation

[0045] like Figures 1-2 As shown, the present invention relates to a delayed detonation device for multi-stage perforation initiation, comprising a gun body 1, a perforation projectile system 2, an initiation system 3, and an isolation mechanism 4.

[0046] Specifically, a pressure sensor 11 is arranged on the end surface of the gun body 1. This sensor is a key component for directly and in real-time sensing the downhole pressure environment during perforation operations. It is mainly used to monitor the dynamic annular pressure around the gun body 1 at the moment of perforation. Its core functions include: real-time recording of the high-pressure shock wave and pressure wave propagation characteristics generated by the explosion of the perforating projectile, providing direct data for assessing the effectiveness of perforation and detecting the safety status of casing and downhole tools. In use, the downhole pressure is detected by the sensor. When the pressure reaches the threshold, the perforation device is detonated by the control system. The perforating projectile system 2, the detonation system 3, and the isolation mechanism 4 are all located inside the gun body 1, with the detonation system 3 located above the perforating projectile system 2. The perforating projectile system 2 consists of a perforating projectile and a projectile holder. The perforating projectile can be a shaped charge perforating projectile. Its core components include: a jet formation using the shaped charge effect, a shaped charge liner, a metal liner to form a high-temperature and high-pressure jet, and a main charge: a high-energy explosive to provide detonation energy. The projectile holder can fix the support of the perforating projectile, ensuring that the perforating projectiles are arranged at a designed relative angle and capable of withstanding the impact load during perforation.

[0047] Combination Figure 1 As shown, in this embodiment, the detonation system 3 includes an inner cylinder 31, which is sleeved inside the gun body 1 and located above the perforation projectile system 2. A hydraulic module 32 is sleeved inside the inner cylinder 31, and a firing pin 33 is arranged at the output end of the hydraulic module 32. A percussion cap 34 is arranged at the bottom of the inner cylinder 31. Specifically, the firing pin 33 applies an impact force to the percussion cap 34 through the hydraulic module 32, causing the percussion cap 34 to generate a flame and ignite the propellant, which is usually a sensitive agent such as lead azide or lead stearate.

[0048] like Figures 3-4 As shown, the isolation mechanism 4 in this embodiment includes a lower mold stationary module 41 and an upper mold moving module 42. The upper mold moving module 42 is located directly above the lower mold stationary module 41. The upper mold moving module 42 can move upward or downward to isolate the firing pin 33 from the spark cap 34.

[0049] Combination Figures 3-6 , Figure 8 and Figures 11-14As shown, in this embodiment, the lower mold stationary module 41 includes two vertically coaxial annular frames 411. The annular frames 411 are sleeved inside the inner cylinder 31. The two annular frames 411 are fixedly connected by several limiting rods 4111. A stationary triangular plate 412 is sleeved inside one of the annular frames 411. An I-beam 4121 is sleeved in the middle of the stationary triangular plate 412. Several support plates 413 are fixedly connected in an annular array on the upper surface of the I-beam 4121, and the support plates 413 are fixed with a thickness of [missing information]. A radial solid partition is formed between the I-beams 4121. Each support plate 413 has a waist-shaped groove 414 on its upper surface along its thickness direction, and the waist-shaped groove 414 passes through the corresponding support plate 413 and the lower stationary triangular plate 412. Each support plate 413 has an arc-shaped slider 415 slidably fitted on its upper surface. Each arc-shaped slider 415 has a drive rod 4151 fixedly connected to its bottom. The drive rod 4151 passes through the waist-shaped groove 414 and the stationary triangular plate 412. Each arc-shaped slider 415 has symmetrically arranged slide rails 4152 on its inner wall. A first spring 4153 is fixedly connected to the top inner wall of each slide rail 4152. Each arc-shaped slider 415 has a slidingly fitted assembly block 416 with a slider on its inner wall. The slider on the assembly block 416 is slidably fitted inside the slide rail 4152, and the slider on the assembly block 416 is elastically connected to the first spring 4153. The end of the assembly block 416 is snapped onto the solid partition formed by the support plate 413. When several assembly blocks 416 are gathered together, their middle parts form a circular conical hole that matches the shape of the impact end of the striker 33. Each support plate 413 has a hollow mounting post 417 fitted on it, and the end of the hollow mounting post 417 passes through the stationary triangular plate 412. An electromagnet module 418 is arranged at the end of each hollow mounting post 417. The drive rod 4151 is elastically connected to the hollow mounting post 417 through a tension spring 419, and the tension spring 419 is located between the stationary triangular plate 412 and the support plate 413.

[0050] It is worth noting that the electromagnet module 418 is a conventional technology and is a magnetic device consisting of an iron core, a coil, and a control circuit. It generates a controllable magnetic field by being energized, thereby attracting or repelling permanent magnets or other ferromagnetic materials. The presence or absence of the magnetic force and its direction can be switched by power-off, reverse current, or pulse control. Specifically, in this structure, it can cooperate with the permanent magnet set in the end of the drive rod 4151 or related components, and the movement state of the drive rod 4151 can be driven or locked by power-on and power-off control.

[0051] Specifically, when several arc-shaped sliders 415 drive the combined blocks 416 to converge, the combined blocks 416 are assembled together to form a partition module with a circular conical hole. The combined blocks 416 are kept moving downward by the preload of the first spring 4153, so that their ends are engaged with the solid partition (i.e., the end of the support plate 413). During the operation, the pressure sensor 11 collects and transmits downhole pressure data in real time. When the pressure reaches the preset threshold, the control system triggers the device to act. At this time, the hydraulically driven striker 33 inserts its end into the circular conical hole and applies axial pressure to the converged combined blocks 416. Since the end of each combined block 416 is engaged with the solid partition, this constraint structure keeps the combined blocks 416 in a fixed position when subjected to the pressure of the striker 33, thereby achieving the effect of delayed detonation.

[0052] This invention realizes intelligent delayed detonation based on real-time downhole pressure sensing. Through the closed loop of pressure sensor 11 and control system, it ensures precise timing of operations, improving the effectiveness of perforation and downhole safety. Secondly, the purely mechanical blocking structure of isolation mechanism 4 (combination block 416 snapped into the solid partition) has extremely high reliability in the delayed state, can withstand the impact load of the firing pin 33, and avoids false triggering. Finally, the release mechanism combining electromagnetic drive and spring return has a rapid response and decisive action, ensuring that the delay from receiving the detonation signal to actual detonation is extremely short, meeting the stringent requirements of timing control for multi-stage perforation. The overall structure is compact and integrated into the gun body 1, making it suitable for complex downhole environments.

[0053] Combination Figures 3-7 , Figures 9-14As shown, in this embodiment, the upper mold moving module 42 includes a moving triangular plate 421, which is slidably sleeved on several limiting rods 4111. Each limiting rod 4111 has a second spring 422 sleeved on its surface, and the second spring 422 is elastically connected to one of the annular frames 411. The bottom of the moving triangular plate 421 is fixedly connected to a permanent magnet module 423 in an annular array, and the permanent magnet module 423 corresponds to the position of the electromagnet module 418. The bottom of the moving triangular plate 421 is fixedly connected to a driving plate 424 in an annular array, and the driving plate 424 corresponds to the position of the arc-shaped slider 415. Each driving plate 424 has an inclined surface 4241 on one side, and the arc-shaped slider 415 slides in contact with the inclined surface 4241. Each driving plate 424 has a connecting hole 4242 on one side, and the side surface of the I-beam 4121 is slidably sleeved with a support. The movable ring 425 of the support rod has several top blocks 4251 fixedly connected in a ring array on its upper surface. The upper surface of the I-beam 4121 has several through holes 426 in a ring array, and the top blocks 4251 are inserted into the through holes 426 and make movable contact with the lower surface of the assembly block 416. Each connecting hole 4242 has a drive frame 427 slidably fitted inside it. When the drive plate 424 moves upward, the lower end of the drive plate 424 slides in the drive frame 427. When the bottom inner wall of the connecting hole 4242 contacts the top inner wall of the drive frame 427, the drive plate 424 will drive the drive frame 427 to move upward. Each drive frame 427 has a bent rod 428 fixedly connected to one side. The end of the bent rod 428 is fitted onto the support rod surface on the movable ring 425, and the end of the bent rod 428 and the movable ring 425 form a lifting adaptation relationship.

[0054] It is worth noting that the permanent magnet module 423 is a magnetic functional element made of hard magnetic materials (such as neodymium iron boron and samarium cobalt) and has a stable spontaneous magnetic field. It can generate a continuous attractive or repulsive force on the outside through its inherent magnetic field.

[0055] Specifically, the downhole pressure is detected by the pressure sensor 11. When the pressure reaches a certain threshold, the control system energizes the electromagnet module 418. Since the firing pin 33 cannot be detonated immediately due to the obstruction of the converging combination block 416, the moving triangular plate 421, under the repulsive force between the energized electromagnet module 418 and the permanent magnet module 423, drives the drive plate 424 to move upward. When the bottom inner wall of the connecting hole 4242 contacts the top inner wall of the drive frame 427, the drive frame 427 is driven to move upward, and then drives the movable ring 425 to move upward through the bending rod 428. The top block 4251 on the movable ring 425 simultaneously pushes several combination blocks 416 upward, causing the combination blocks 416 to leave the path of the firing pin 33 and release their obstruction of the firing pin 33. At the same time, the tension spring 419 applies a pulling force to the arc-shaped slider 415, quickly pulling the combination blocks 416 back to their original position, so that the firing pin 33 can immediately strike the spark cap 34.

[0056] The delayed detonation device of this invention, through the ingenious mechanical and electromagnetic linkage design of the isolation mechanism 4, achieves precise and reliable delayed detonation and rapid triggering functions. This solves the technical problems of existing perforation devices, such as difficulty in accurately controlling the detonation sequence under complex pressure environments, insufficient delay stability, and excessively long delay from deflection to detonation response. Its core lies in the following: In the standby state, the inclined surface 4241 of the drive plate 424 pushes the arc-shaped slider 415, causing the combined block 416 to converge and be clamped by the pre-tightening force of the first spring 4153, forming a reliable mechanical barrier that effectively isolates the firing pin 33 from the percussion cap 3. 4. When the downhole pressure reaches the preset threshold, the control system triggers the electromagnet module 418 to generate a repulsive force, driving the moving triangle plate 421 and the drive plate 424 to move upward. Through the linkage of the drive frame 427 and the bending rod 428, the movable ring 425 top block 4251 quickly pushes the combined block 416 away from its original position. At the same time, the restoring force of the tension spring 419 assists in quickly pulling the combined block 416 back, instantly releasing the obstruction, so that the hydraulically driven firing pin 33 can immediately strike the fire cap 34. This "obstruction-release" mechanism ensures the stability of the delay process and the instantaneity of the detonation action.

[0057] Working principle: This embodiment provides a delayed detonation device for multi-stage perforation initiation. During delayed detonation, the second spring 422 applies a force to the movable triangular plate 421, causing the movable triangular plate 421 to move downwards and also having a downward tendency. During this process, the inclined surface 4241 contacts one side of the arc-shaped slider 415, applying an inclined force to the arc-shaped slider 415. The arc-shaped slider 415 slides along the path of the waist-shaped groove 414 via the drive rod 4151, and the arc-shaped slider 415... The pusher moves the assembly block 416 toward the shaft of the I-beam 4121, causing several assembly blocks 416 to gather and assemble above the I-beam 4121. After assembly, the upper surface has a circular conical hole, and the firing pin 33 can be inserted into the circular conical hole (the shape of the circular conical hole matches the output end of the firing pin 33). During detonation, the hydraulic module 32 drives the firing pin 33 to move. Because the gathered assembly blocks 416 are inserted into the circular conical hole, the firing pin 33 is detonated. During delayed perforation, the downhole pressure is detected by the pressure sensor 11. When the force reaches the threshold, the electromagnet module 418 is connected to the power supply (powered state) through the control system. At this time, under the repulsive force between the energized electromagnet module 418 and the permanent magnet module 423, the moving triangle plate 421 drives the drive plate 424 to move upward. When the bottom inner wall of the connecting hole 4242 contacts the top inner wall of the drive frame 427, the drive frame 427 is driven to move upward, and then the moving ring 425 is driven to move upward through the bending rod 428. At the same time, the top block 4251 on the moving ring 425 pushes out several combined blocks 416 upward. At this time, the firing pin 33 has a tendency to move downward. Therefore, while several combined blocks 416 are pushed out, the firing pin 33 applies force in the circular conical hole, and the tension spring 419 applies tension to the arc-shaped slider 415, which can quickly pull the arc-shaped slider 415 and the combined blocks 416 back to their original position, so that the firing pin 33 can immediately strike the fire cap 34, thereby triggering the perforation projectile system 2 for downhole perforation operation.

[0058] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A delayed detonation device for multi-stage perforation initiation, comprising a gun body (1), a pressure sensor (11), a perforation projectile system (2), an initiation system (3), and an isolation mechanism (4), characterized in that, The detonation system (3) includes an inner cylinder (31) fitted inside the gun body (1), a firing pin (33) fitted inside the inner cylinder (31) and equipped with hydraulic drive, and a percussion cap (34) installed at the bottom of the inner cylinder (31). The isolation mechanism (4) includes a lower mold stationary module (41) and an upper mold moving module (42), and the upper mold moving module (42) is located directly above the lower mold stationary module (41) and can move upward or downward; The lower mold stationary module (41) includes an I-beam (4121) sleeved inside the inner cylinder (31). The upper surface of the I-beam (4121) is fixedly connected with several support plates (413) in a ring array. The support plates (413) form a radial solid partition between the I-beams (4121) along their thickness direction. Each of the support plates (413) is equipped with an arc-shaped slider (415) on its upper surface, and the arc-shaped slider (415) has an elastic reset function; Each of the arc-shaped sliders (415) has a sliding adaptation of a combination block (416) on its inner wall, and the combination block (416) has a downward elastic movement tendency; The end of the combined block (416) is snapped onto the solid partition formed by the support plate (413); When the aforementioned arc-shaped sliders (415) move, they can cause the corresponding combination blocks (416) to gather or unfold. When several assembly blocks (416) come together, their upper surfaces together form a circular conical hole, and the circular conical hole is adapted to the shape of the impact end of the firing pin (33); When several assembly blocks (416) come together, the hydraulically driven striker (33) moves downward, and the impact end of the striker (33) is inserted into the circular conical hole, and the impact path of the striker (33) is interrupted; when the upper mold moving module (42) moves upward, it pushes the arc-shaped slider (415) to slide, so that the assembly blocks (416) unfold, the circular conical hole is released, and the striker (33) strikes the spark cap (34).

2. The delayed detonation device for multi-stage perforation initiation according to claim 1, characterized in that, The detonation system (3) also includes a hydraulic module (32), which is fitted inside the inner cylinder (31), and the firing pin (33) is installed at the output end of the hydraulic module (32).

3. The delayed detonation device for multi-stage perforation initiation according to claim 2, characterized in that, The lower mold stationary module (41) also includes two vertically coaxial ring frames (411). The ring frames (411) are sleeved inside the inner cylinder (31). The two ring frames (411) are fixedly connected by several limiting rods (4111). One of the ring frames (411) has a stationary triangle plate (412) sleeved inside. The I-beam (4121) is installed at the center of the stationary triangle plate (412).

4. The delayed detonation device for multi-stage perforation initiation according to claim 3, characterized in that, Each of the support plates (413) has a waist-shaped groove (414) on its upper surface along its thickness direction, and the waist-shaped groove (414) passes through the corresponding support plate (413) and the static triangular plate (412) below.

5. A delayed detonation device for multi-stage perforation initiation according to claim 4, characterized in that, Each of the arc-shaped sliders (415) has a drive rod (4151) fixedly connected to its bottom. The drive rod (4151) passes through the stationary triangle plate (412) from the waist-shaped slide groove (414). Each of the arc-shaped sliders (415) has a slide rail (4152) symmetrically opened on its inner wall. Each of the slide rails (4152) has a first spring (4153) fixedly connected to its top inner wall.

6. The delayed detonation device for multi-stage perforation initiation according to claim 5, characterized in that, The slider on the assembly block (416) is slidably adapted to the inside of the slide rail (4152), and the slider on the assembly block (416) is elastically connected to the first spring (4153).

7. A delayed detonation device for multi-stage perforation initiation according to claim 6, characterized in that, Each of the support plates (413) is fitted with a hollow mounting post (417), and the end of the hollow mounting post (417) passes through the stationary triangle plate (412). An electromagnet module (418) is arranged at the end of each hollow mounting post (417). The drive rod (4151) is elastically connected to the hollow mounting post (417) through a tension spring (419), and the tension spring (419) is located between the stationary triangle plate (412) and the support plate (413).

8. A delayed detonation device for multi-stage perforation initiation according to claim 7, characterized in that, The upper mold moving module (42) includes a moving triangle plate (421), which is slidably sleeved on a plurality of limiting rods (4111). Each limiting rod (4111) is sleeved with a second spring (422), and the second spring (422) is elastically connected to one of the ring frames (411). The bottom of the moving triangle plate (421) is fixedly connected with a permanent magnet module (423) in a ring array, and the permanent magnet module (423) corresponds to the position of the electromagnet module (418).

9. A delayed detonation device for multi-stage perforation initiation according to claim 8, characterized in that, The bottom of the moving triangle plate (421) is fixedly connected to the drive plate (424) in a ring array, and the drive plate (424) corresponds to the position of the arc slider (415). Each drive plate (424) has an inclined surface (4241) on one side, and the arc slider (415) slides in contact with the inclined surface (4241). Each drive plate (424) has a connecting hole (4242) on one side.

10. A delayed detonation device for multi-stage perforation initiation according to claim 9, characterized in that, The side surface of the I-beam (4121) is slidably fitted with a movable ring (425) with a support rod. The upper surface of the movable ring (425) is fixedly connected with a number of top blocks (4251) in a ring array. The upper surface of the I-beam (4121) is provided with a number of through holes (426) in a ring array. The top blocks (4251) are inserted into the through holes (426) and are in movable contact with the lower surface of the assembly block (416). Each of the connecting holes (4242) is slidably fitted with a drive frame (427). When the drive plate (424) moves upward, the bottom inner wall of the connecting hole (4242) contacts the top inner wall of the drive frame (427), and the drive plate (424) drives the drive frame (427) to move upward. Each drive frame (427) is fixedly connected to a bending rod (428) on one side. The end of the bending rod (428) is sleeved on the support rod surface of the movable ring (425), and the end of the bending rod (428) and the movable ring (425) form a lifting adaptation relationship.

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