Delay explosion propagation device for multi-stage perforation detonation

Abstract

The invention discloses a delay explosion propagation device for multi-stage perforation detonation, relates to the technical field of multi-stage perforation, and aims at solving the technical problem that an existing delay explosion propagation device is insufficient in safety isolation in the delay waiting stage. The delay explosion propagation device comprises a gun body, a pressure sensor, a perforating bullet system, a detonation system and an isolation mechanism; the detonating system comprises an inner barrel connected into the gun body in a sleeved mode, a firing pin arranged in the inner barrel in a sleeved mode and provided with hydraulic drive, and a fire cap installed at the bottom of the inner barrel. Through gathering and unfolding of the combination blocks in the isolation mechanism, reliable separation and connection of the impact path of the firing pin are achieved, the firing pin can directly impact the fire cap to complete detonation only when the combination blocks are unfolded, the impact path is separated and cannot be detonated when the combination blocks are gathered, and therefore an active controllable mechanical safety isolation means is provided; the technical problems that an existing delay explosion propagation device is detonated in advance due to the fact that a firing pin accidentally impacts a fire cap due to false triggering or pressure fluctuation in the delay waiting period, and safety is insufficient are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multistage perforation, more particularly to a delay detonation device for multistage perforation initiation. BACKGROUND

[0002] Currently, the core problem of the delay detonation device for multistage perforation initiation lies in how to ensure precise and reliable delay control and absolute safety of operation in a complex and harsh downhole environment.

[0003] The existing technology has a prominent problem of insufficient safety and reliability in the delay waiting stage of multistage perforation operation. The traditional detonation device often relies on electronic delay or single hydraulic control, and lacks effective physical isolation mechanism. When the downhole pressure abnormally fluctuates, the sensor misjudges or the system is disturbed, the striker may malfunction at an unexpected time and directly impact the primer, causing the perforating charge to initiate prematurely. This not only disrupts the initiation timing and causes the stage operation to fail, but also may cause gun jamming, pipe column damage and even well control risk, which seriously restricts the safety and success rate of operation.

[0004] The existing device has obvious limitations in the precise control of initiation timing and response speed. In a complex and variable downhole pressure environment, the scheme relying on pure hydraulic or electronic delay is difficult to achieve high-precision and high-stability delay control, and is prone to problems of delay time drift or asynchronous initiation. At the same time, the response delay from receiving the initiation signal to completing the mechanical action is long, which affects the overall efficiency and effect of multistage perforation operation. In view of this, we propose a delay detonation device for multistage perforation initiation. SUMMARY

[0005] The purpose of the present application is to provide a delay detonation device for multistage perforation initiation to solve the technical problem of insufficient safety isolation of the existing delay detonation device in the delay waiting stage.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a delay detonation device for multistage perforation initiation, comprising a gun body, a pressure sensor, a perforating charge system, an initiation system and an isolation mechanism, the initiation system comprising an inner cylinder sleeved inside the gun body, a striker with hydraulic drive sleeved inside the inner cylinder, and a primer installed at the bottom of the inner cylinder; The isolation mechanism comprises a lower static die module and an upper dynamic die module, and the upper dynamic die module is located directly above the lower static die module and can move upward or downward; The lower static die module comprises an I-shaped cylinder sleeved inside the inner cylinder; The upper surface of the I-shaped cylinder is fixedly connected with a plurality of branch plates in a ring array, and the branch plates form a radial solid partition along the thickness direction of the I-shaped cylinder; Each upper surface of the support plate is slidably fitted with an arc-shaped slider, and the arc-shaped slider has an elastic reset function. Each inner wall of the arc-shaped slider is slidably fitted with a combination block, and the combination block has a downward elastic movement trend. The end of the combination block is clamped on the entity partition formed by the support plate. When the arc-shaped sliders move, they can drive the corresponding combination blocks to gather or spread out. When the combination blocks gather, their upper surfaces collectively form a circular tapered hole, and the circular tapered hole is adapted in shape to the impact end of the firing pin. When the combination blocks gather, when the hydraulic drive firing pin moves downward, the impact end of the firing pin is inserted into the circular tapered hole, and the impact path of the firing pin is blocked; when the upper die module moves upward, it pushes the arc-shaped sliders to slide, causing the combination blocks to spread out, the circular tapered hole is released, and the firing pin impacts on the primer cap. The present application realizes reliable blocking and connection of the impact path of the firing pin through the gathering and spreading of the combination blocks in the isolation mechanism, so that the firing pin can directly impact the primer cap to complete the initiation only when the combination blocks spread out, and the impact path is blocked when the combination blocks gather, so that the firing pin cannot initiate. Therefore, an active and controllable mechanical safety isolation means is provided to solve the technical problems of insufficient safety caused by accidental impact of the firing pin on the primer cap and premature initiation of the existing delay booster during the delay waiting period.

[0007] Preferably, the initiation system further comprises a hydraulic module, the hydraulic module is sleeved in the inner cylinder, and the firing pin is installed at the output end of the hydraulic module.

[0008] Preferably, the lower die static module further comprises two vertically coaxial annular frames, the annular frames are sleeved in the inner cylinder, and the two annular frames are fixedly connected through a plurality of limiting rods, one of the annular frames is sleeved with a static triangular plate inside, and the I-shaped cylinder is installed at the center position of the static triangular plate.

[0009] Preferably, the upper surface of each support plate is provided with a waist-shaped sliding groove along the thickness direction of the plate, and the waist-shaped sliding groove penetrates through the corresponding support plate and the static triangular plate below.

[0010] Preferably, each arc-shaped slider is fixedly connected with a driving rod at the bottom, the driving rod passes through the static triangular plate from the waist-shaped sliding groove, the inner wall of each arc-shaped slider is symmetrically provided with a sliding rail, and the top inner wall of each sliding rail is fixedly connected with a first spring.

[0011] Preferably, the slider on the combination block is slidably fitted in the sliding rail, and the slider on the combination block is elastically connected with the first spring.

[0012] Preferably, a hollow mounting column is sleeved on each of the support plates, and the end of the hollow mounting column penetrates the static triangular plate, and an electromagnet module is arranged at the end of each of the hollow mounting columns, the driving rod is elastically connected with the hollow mounting column through a tension spring, and the tension spring is located between the static triangular plate and the support plate.

[0013] Preferably, the upper die moving module comprises a dynamic triangular plate, the dynamic triangular plate is slidably sleeved on a plurality of limiting rods, a second spring is sleeved on the surface of each of the limiting rods, and the second spring is elastically connected with one of the annular frames, a plurality of permanent magnet modules are fixedly connected in an annular array at the bottom of the dynamic triangular plate, and the permanent magnet modules correspond in position to the electromagnet modules.

[0014] Preferably, a driving plate is fixedly connected in an annular array at the bottom of the dynamic triangular plate, and the driving plate corresponds in position to the arc-shaped sliding block, an inclined surface is arranged on one side of each of the driving plates, the arc-shaped sliding block is in sliding contact with the inclined surface, and a through hole is formed in one side of each of the driving plates.

[0015] Preferably, the I-shaped tube is slidably sleeved with a support rod on the side surface, a plurality of top blocks are fixedly connected in an annular array on the upper surface of the movable ring, a plurality of through holes are formed in an annular array on the upper surface of the I-shaped tube, the top blocks are inserted into the through holes and are in movable contact with the lower surface of the combined block, and a driving frame is slidably sleeved in each of the through holes. When the driving plate moves upward, the bottom inner wall of the through hole is in contact with the top inner wall of the driving frame, the driving plate drives the driving frame to move upward, a curved rod is fixedly connected on one side of each of the driving frames, the curved rod is sleeved on the surface of the support rod on the movable ring, and the curved rod end corresponds in jacking relationship to the movable ring. Compared with the prior art, the present application has the following advantages: 1. By gathering and unfolding of the combined block in the isolation mechanism, reliable isolation and connection of the striker impact path are realized, so that the striker can directly impact the primer to complete detonation only when the combined block is unfolded, and the impact path is disconnected and cannot be detonated when the combined block is gathered, thereby providing a kind of active controllable mechanical safety isolation means to solve the technical problems of insufficient safety of the prior art delay booster device, such as accidental impact of the striker on the primer and premature detonation caused by misfire or pressure fluctuation during delay waiting.

[0016] 2、The delay booster of the application, through the ingenious mechanical and electromagnetic linkage design of the isolation mechanism, realizes the precise and reliable delay and rapid triggering function, to solve the technical problems that the existing perforating device is difficult to accurately control the detonation timing, the delay stability is insufficient and the response delay from unblocking to detonation is too long under complex pressure environment, the core lies in: in the standby state, the inclined surface of the driving plate pushes the arc-shaped slider, the combined block is gathered and clamped by the pre-tightening force of the first spring, forming a reliable mechanical block, effectively isolating the striker and the primer; when the downhole pressure reaches the preset threshold, the control system triggers the electromagnetic module to generate repulsive force, drives the driving plate and the driving plate to go up, through the linkage of the driving frame and the curved rod, the combined block is quickly pushed away from the original position by the movable ring top block, at the same time, the restoring force of the tension spring helps to quickly pull back the combined block, and the block is removed instantly, so that the hydraulic driven striker can immediately hit the primer, the "blocking-unblocking" mechanism ensures the stability of the delay process and the instantaneousness of the detonation action.

[0017] 3、The application realizes intelligent delay detonation based on real-time sensing of downhole pressure, through the closed loop of pressure sensor and control system, ensures the accurate operation time, improves the perforation effectiveness and downhole safety; secondly, the pure mechanical blocking structure of the isolation mechanism (the combined block is clamped on the solid partition) has high reliability in the delay state, can withstand the impact load of the striker, avoids mis-triggering, finally, the unblocking mechanism combining electromagnetic drive and spring return is fast in response and decisive in action, ensures that the delay from receiving the detonation signal to actual detonation is extremely short, meets the strict requirements of multi-stage perforation on timing control, the overall structure is compact, integrated in the gun body, suitable for complex downhole environment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure section of the application, to show the internal structure of the gun body; Figure 2 It is a schematic diagram of the overall structure of the application; Figure 3 It is a schematic diagram of the overall structure of the isolation mechanism of the application; Figure 4 It is a schematic diagram of the three-dimensional local structure of the isolation mechanism of the application; Figure 5 It is a schematic diagram of the three-dimensional structure of the lower mold static module of the application; Figure 6 It is a schematic diagram of the three-dimensional structure of the upper mold dynamic module of the application; Figure 7 It is a schematic diagram of the three-dimensional structure of the curved rod of the application; Figure 8 It is a schematic diagram of the three-dimensional explosion structure of the combined block of the application; Figure 9 It is a schematic diagram of the three-dimensional structure of the driving plate of the application; Figure 10 The profile structure schematic diagram of the driving plate of the application; Figure 11 The structure schematic diagram of the striker and the primer isolation use state of the application; Figure 12 The structure schematic diagram of the delay perforation use state of the application Figure 1 ; Figure 13 The structure schematic diagram of the delay perforation use state of the application Figure 2 ; Figure 14 The structure schematic diagram of the striker operation use state of the application.

[0019] The figure label explanation: 1, the gun body; 11, pressure sensor; 2, perforating bomb system; 3, initiation system; 31, inner cylinder; 32, hydraulic module; 33, striker; 34, primer; 4, isolation mechanism; 41, lower static die module; 411, annular frame; 4111, limit rod; 412, static triangular plate; 4121, I-beam; 413, support plate; 414, waist-shaped sliding groove; 415, arc-shaped sliding block; 4151, driving rod; 4152, slide rail; 4153, first spring; 416, combined block; 417, hollow mounting column; 418, electromagnet module; 419, tension spring; 42, upper dynamic die module; 421, dynamic triangular plate; 422, second spring; 423, permanent magnet module; 424, driving plate; 4241, inclined plane; 4242, associated hole; 425, movable ring; 4251, top block; 426, through hole; 427, driving frame; 428, curved rod. DETAILED DESCRIPTION

[0020] As Figures 1-2 shown, the application relates to a multi-stage perforation initiation delay booster, comprising a gun body 1, a perforating bomb system 2, an initiation system 3 and an isolation mechanism 4.

[0021] Specifically, the gun body 1 end surface is arranged with a pressure sensor 11, which is a key component for directly and real-time sensing the downhole pressure environment in the perforating operation, mainly used for monitoring the annular pressure dynamic around the gun body 1 at the perforating moment, and its core functions include: real-time recording of the high-pressure shock wave and pressure wave propagation characteristics generated by the perforating bullet explosion, providing direct data basis for evaluating the perforating effectiveness and detecting the safety state of the casing and downhole tools; in use, the downhole pressure is detected through the sensor, and when the pressure reaches the threshold value, the perforating device is initiated through the control system; the perforating bullet system 2, the initiation system 3 and the isolation mechanism 4 are located inside the gun body 1, and the initiation system 3 is located above the perforating bullet system 2; wherein the perforating bullet system 2 is composed of a perforating bullet and a bullet holder, and the perforating bullet can be a shaped charge; its core components include: a jet formed by using a shaped charge effect, a shaped charge liner; a metal cover to form a high-temperature and high-pressure jet; main charge: high explosive, providing detonation energy; bullet holder: a bracket for fixing the perforating bullet, ensuring that the perforating bullet is arranged at a designed relative angle and can withstand the impact load during perforating.

[0022] In combination Figure 1 As shown in the embodiment, the initiation system 3 includes an inner cylinder 31, which is sleeved inside the gun body 1 above the perforating bullet system 2, and 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, and a primer 34 is arranged at the bottom of the inner cylinder 31; specifically, the firing pin 33 applies impact force to the primer 34 through the hydraulic module 32, so that the primer 34 generates flame to ignite the transfer charge, and sensitive reagents such as lead azide and lead styphnate are usually used.

[0023] As Figures 3-4 shown, the isolation mechanism 4 of the embodiment includes a lower mold static module 41 and an upper mold dynamic module 42, and the upper mold dynamic module 42 is located directly above the lower mold static module 41; the upper mold dynamic module 42 can move upwards or downwards to isolate the firing pin 33 and the primer 34.

[0024] In combination Figures 3-6 , Figure 8 and Figures 11-14As shown, in the embodiment, the lower mold static die block 41 comprises two vertically coaxial annular frames 411 sleeved inside the inner cylinder 31, the two annular frames 411 are fixedly connected through a plurality of limiting rods 4111, one of the annular frames 411 is sleeved with a static triangular plate 412 inside, the static triangular plate 412 is sleeved with an I-beam 4121 in the middle, a plurality of 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 separated in the radial direction by the thickness of the plates to form a solid partition along the I-beam 4121, a waist-shaped sliding groove 414 is formed on the upper surface of each support plate 413 along the thickness of the plate, and the waist-shaped sliding groove 414 penetrates through the corresponding support plate 413 and the static triangular plate 412 below, an arc-shaped sliding block 415 is slidingly connected to the upper surface of each support plate 413, a drive rod 4151 is fixedly connected to the bottom of each arc-shaped sliding block 415, the drive rod 4151 penetrates through the static triangular plate 412 from the waist-shaped sliding groove 414, a sliding rail 4152 is symmetrically formed in the inner wall of each arc-shaped sliding block 415, a first spring 4153 is fixedly connected to the top inner wall of each sliding rail 4152, a combination block 416 with a sliding block is slidingly connected to the inner wall of each arc-shaped sliding block 415, the sliding block on the combination block 416 is slidingly connected to the inside of the sliding rail 4152, and the sliding block on the combination block 416 is elastically connected with the first spring 4153, the combination block 416 is clamped on the solid partition formed by the support plate 413, a plurality of combination blocks 416 are gathered together, the middle part of which forms a circular tapered hole and is adapted to the shape of the impact end of the striker 33, a hollow mounting column 417 is sleeved on each support plate 413, and the end of the hollow mounting column 417 penetrates through the static triangular plate 412, an electromagnet module 418 is arranged at the end of each hollow mounting column 417, the drive rod 4151 and the hollow mounting column 417 are elastically connected through a tension spring 419, and the tension spring 419 is located between the static triangular plate 412 and the support plate 413.

[0025] It is worth noting that the electromagnet module 418 is a conventional technology, which is a magnetic force device composed of a core, a coil and a control circuit. It generates a controllable magnetic field through power supply, realizes attraction or repulsion with permanent magnets or other ferromagnetic materials, and can realize the switching of magnetic force and direction through power-off, reverse current or pulse control; specifically in this structure, it can cooperate with the permanent magnet arranged in the end of the drive rod 4151 or related parts to realize the driving or locking of the movement state of the drive rod 4151 through on-off control.

[0026] Specifically, when the arc-shaped sliders 415 drive the combined blocks 416 to gather, the combined blocks 416 are assembled into a partition module with a circular tapered hole; the combined blocks 416 keep a downward moving trend through the pre-tightening force of the first springs 4153, so that the end portions of the combined blocks 416 are clamped on the entity partition (i.e. the end portion of the support plate 413); during the operation, the pressure sensor 11 collects and transmits the 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 hydraulic driven striker 33 inserts into the circular tapered hole with the end portion, and applies axial pressure to the gathered combined blocks 416; since the end portion of each combined block 416 is clamped on the entity partition, the constraint structure makes the combined blocks 416 keep fixed position when bearing the pressure of the striker 33, so that the delay effect of detonation is realized.

[0027] The present application realizes intelligent delay initiation based on real-time sensing of downhole pressure, through the closed loop of the pressure sensor 11 and the control system, ensures the accurate operation opportunity, and improves the perforation effectiveness and downhole safety; secondly, the pure mechanical blocking structure (the combined blocks 416 are clamped on the entity partition) of the isolation mechanism 4 has very high reliability in the delay state, can bear the impact load of the striker 33, avoids mis-triggering, finally, the release mechanism combining electromagnetic drive and spring return responds quickly and acts decisively, ensures that the delay from receiving the initiation signal to actual detonation is very short, meets the strict requirements of multi-stage perforation on time sequence control, the overall structure is compact, integrated in the gun body 1, suitable for complex downhole environment.

[0028] In combination with Figures 3-7 , Figures 9-14As shown, in the embodiment, the upper die moving module 42 comprises a moving cam plate 421, the moving cam plate 421 is sleeved on a plurality of limiting rods 4111, a second spring 422 is sleeved on the surface of each limiting rod 4111, and the second spring 422 is elastically connected with one of the annular frames 411, a permanent magnet module 423 is fixedly connected in an annular array on the bottom of the moving cam plate 421, and the permanent magnet module 423 corresponds in position to the electromagnet module 418, a driving plate 424 is fixedly connected in an annular array on the bottom of the moving cam plate 421, and the driving plate 424 corresponds in position to the arc-shaped sliding block 415, an inclined surface 4241 is arranged on one side of each driving plate 424, the arc-shaped sliding block 415 is in sliding contact with the inclined surface 4241, a through hole 4242 is formed on one side of each driving plate 424, a movable ring 425 provided with a supporting rod is sleeved on the side surface of the I-shaped cylinder 4121, a plurality of top blocks 4251 are fixedly connected in an annular array on the upper surface of the movable ring 425, a plurality of through holes 426 are formed in an annular array on the upper surface of the I-shaped cylinder 4121, the top blocks 4251 are inserted into the through holes 426 and are in movable contact with the lower surface of the combined block 416, and a driving frame 427 is sleeved in each through hole 4242, when the driving plate 424 moves upward, the lower end of the driving plate 424 slides in the driving frame 427, when the inner wall at the bottom of the through hole 4242 is in contact with the inner wall at the top of the driving frame 427, the driving plate 424 drives the driving frame 427 to move upward, and a curved rod 428 is fixedly connected on one side of each driving frame 427, the curved rod 428 is sleeved on the supporting rod on the movable ring 425, and the curved rod 428 and the movable ring 425 form a jacking adaptive relationship.

[0029] It is worth noting that the permanent magnet module 423 is a magnetic functional element made of hard magnetic material (such as neodymium iron boron and samarium cobalt) and has a stable spontaneous magnetic field, which can generate continuous attractive or repulsive force to the outside through its inherent magnetic field.

[0030] Specifically, the downhole pressure is detected by the pressure sensor 11, when the pressure reaches a certain threshold, the control system supplies power to the electromagnet module 418, since the firing pin 33 is blocked by the combined block 416 gathered, it cannot immediately detonate, at this time, the moving cam plate 421 is driven by the repulsive force between the electromagnet module 418 and the permanent magnet module 423 after power-on, and the driving plate 424 moves upward, when the inner wall at the bottom of the through hole 4242 is in contact with the inner wall at the top of the driving frame 427, the driving frame 427 is driven to move upward, and then the movable ring 425 is driven to move upward through the curved rod 428, the top blocks 4251 on the movable ring 425 simultaneously push out a plurality of combined blocks 416 upward, so that the combined blocks 416 are separated from the path of the firing pin 33, and the blockage of the firing pin 33 is removed, at the same time, the tensile spring 419 exerts a pulling force on the arc-shaped sliding block 415, and the combined blocks 416 are quickly pulled back to the original position, so that the firing pin 33 can immediately hit the primer 34.

[0031] The delay booster of the present application realizes precise and reliable delay and rapid triggering functions through the ingenious mechanical and electromagnetic linkage design of the isolation mechanism 4, to solve the technical problems that the existing perforating device is difficult to accurately control the detonation timing, lacks delay stability and has too long response delay from unblocking to detonation under complex pressure environment. The core lies in: in the standby state, the inclined surface 4241 of the driving plate 424 pushes the arc-shaped slider 415, so that the combined block 416 is gathered and clamped by the pre-tightening force of the first spring 4153, forming a reliable mechanical block and effectively isolating the firing pin 33 and the primer 34; when the downhole pressure reaches the preset threshold, the control system triggers the electromagnetic module 418 to generate repulsion, driving the driving triangular plate 421 and the driving plate 424 to move upward, through the linkage of the driving frame 427 and the curved rod 428, the combined block 416 is quickly pushed away from the original position by the top block 4251 of the movable ring 425, at the same time, the restoring force of the tension spring 419 helps to quickly pull back the combined block 416, instantly removing the block, so that the hydraulic-driven firing pin 33 can immediately hit the primer 34. The "blocking-removing" mechanism ensures the stability of the delay process and the instantaneousness of the detonation action.

[0032] Working principle: the embodiment provides a multistage perforation initiation delay booster device, when the delay booster, the second spring 422 exerts force on the movable triangular plate 421, causing the movable triangular plate 421 to move downwards and also have a downward moving tendency, in the process, the inclined surface 4241 is in contact with one side of the arc-shaped slider 415, exerting an inclined force on the arc-shaped slider 415, the arc-shaped slider 415 slides along the path of the waist-shaped sliding groove 414 through the driving rod 4151, and the arc-shaped slider 415 pushes the combined block 416 to move towards the shaft core of the I-beam 4121, causing the several combined blocks 416 to gather and assemble above the I-beam 4121, after assembly, the upper surface has a circular tapered hole, and the firing pin 33 can be inserted into the circular tapered hole (the circular tapered hole is matched with the shape of the output end of the firing pin 33), when initiating, the firing pin 33 is driven to move by the hydraulic module 32, and the several combined blocks 416 are inserted into the circular tapered hole due to the gathering of the several combined blocks 416, when delaying perforation, when the downhole pressure reaches the threshold value, the control system transmits information through the pressure sensor 11, the electromagnetic module 418 is connected to the power supply (in the electrified state), at this time, the movable triangular plate 421 is driven to move upwards under the repulsive force between the electromagnetic module 418 after electrification and the permanent magnet module 423, when the bottom inner wall of the clamping hole 4242 is in contact with the top inner wall of the driving frame 427, the driving frame 427 is driven to move upwards, and then the driving frame 427 drives the movable ring 425 to move upwards through the curved rod 428, the top block 4251 on the movable ring 425 simultaneously pushes the several combined blocks 416 upwards, at this time, the firing pin 33 has a downward moving tendency, therefore, when the several combined blocks 416 are pushed out, the arc-shaped slider 415 and the combined blocks 416 are quickly pulled back to the original position due to the action force of the firing pin 33 in the circular tapered hole and the pulling force of the tension spring 419 on the arc-shaped slider 415, so that the firing pin 33 can immediately impact on the primer 34, and then trigger the perforating bullet system 2 to perform downhole perforation operation.

[0033] The preferred embodiments are disclosed in the present application, but the present application is not limited thereto, and those skilled in the art can easily understand the spirit of the present application according to the above embodiments, and make different inferences and changes, as long as they do not deviate from the spirit of the present application, they are within the protection scope of the present application.

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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