Multi-point synchronous detonation perforating charge shell structure

Abstract

The invention relates to the technical field of oil and gas well logging, in particular to a multi-point synchronous detonation perforating charge shell structure. The structure comprises a multi-point synchronous detonating device and a main charging structure, the multi-point synchronous detonating device is connected with the main charging structure, a shaped charge liner is installed in the main charging structure, and the space between the inner surface of the main charging structure and the outer surface of the shaped charge liner is filled with explosives; the multi-point synchronous detonating device comprises a main body, an explosion expanding head, a flexible shunting rope and an explosion propagation pin, the main body is of a two-layer structure and comprises a first-layer main body and a second-layer main body, the first-layer main body is connected with the second-layer main body, and the second-layer main body is connected with a main charging structure; the center of the first-layer main body is provided with an explosion expanding head, the second-layer main body is provided with a plurality of flexible shunting cables, and the tail end of each flexible shunting cable is connected with an explosion propagation pin; a plurality of explosion propagation holes are formed in the top end of the main charging structure and correspondingly matched with the explosion propagation pins. The multi-point synchronous detonation perforating bullet shell structure is simple in structure, safe, reliable and suitable for the field of petroleum perforation.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well logging, and in particular to a multi-point synchronous detonation perforating bullet shell structure. Background Art

[0002] Detonation waveform control technology is the key technology for forming high-power penetrating jets. Currently, the more commonly used waveform control technologies mainly include the use of partitions in explosives, multi-point detonation electronic control technology, etc.

[0003] The use of baffles in the charge increases the number of technical steps required to form the main charge, complicating the process and tooling. Furthermore, since baffle technology is only applicable to melt-cast charges, it presents significant challenges in press-fitting, a process currently used by all existing perforating bullets. Therefore, in the field of perforating bullet production, the use of baffles in charges is still in the theoretical research stage. While multi-point detonation electronic control technology does not impose special requirements on the charge process, it places extremely high demands on detonation synchronization, resulting in high costs. Furthermore, the requirement for each detonation point to use a pyrotechnic device makes its practical application in the oil perforating field very difficult. Due to significant safety issues, multi-point detonation electronic control technology has not been practically applied in this field, and perforating bullets currently generally use end-center detonation. Therefore, to address these deficiencies, a multi-point synchronous detonation perforating bullet shell structure is proposed. Summary of the Invention

[0004] (1) Technical issues to be resolved The present invention provides a multi-point synchronous detonation perforating charge shell structure, which avoids the problems of the existing method such as extremely high detonation synchronization requirements, high cost and prominent safety issues of the multi-point detonation electronic control technology, which makes the actual application of the multi-point detonation electronic control technology in the field of oil perforation extremely difficult.

[0005] (2) Technical solution In order to solve the above problems, the present invention provides a multi-point synchronous detonation perforating charge shell structure, comprising: A multi-point synchronous detonator and a main charge structure, wherein the multi-point synchronous detonator is connected to the main charge structure, a charge liner is installed inside the main charge structure, a cavity is formed between the inner surface of the main charge structure and the outer surface of the charge liner, and the interior of the cavity is filled with explosives; The multi-point synchronous detonator includes a main body, an expansion head, a flexible diverter rope and a detonating pin. The main body has a two-layer structure, namely a first layer main body and a second layer main body. The first layer main body and the second layer main body are connected, and the second layer main body is connected to the main charge structure. The center of the first layer body is provided with an expansion head, and the second layer body is provided with a plurality of flexible diversion ropes, and a detonation pin is provided at the end of each flexible diversion rope; A plurality of explosion holes are provided on the top of the main charge structure, and the explosion holes correspond to explosion pins.

[0006] Preferably, the outer side of the main charge structure is cylindrical, and a plurality of explosion holes are provided at the center of the top of the main charge structure.

[0007] Preferably, the main charge structure is provided with an inner cavity, which includes a first truncated cone cavity, a second truncated cone cavity and a first cylindrical cavity, the inscribed circle diameter of the first truncated cone cavity is smaller than the inscribed circle diameter of the second truncated cone cavity, and the inscribed circle diameter of the second truncated cone cavity is smaller than the inscribed circle diameter of the first cylindrical cavity.

[0008] Preferably, a plurality of wiring grooves are evenly distributed around the inner wall of the second layer body, and the second layer body is provided with flexible diverter cables through the wiring grooves.

[0009] Preferably, the first layer body and the second layer body are both truncated cones, the inscribed circle diameter of the first layer body is smaller than the inscribed circle diameter of the second layer body, the first layer body is connected to the second layer body through a first pin, and the second layer body is connected to the main charge structure through a second pin.

[0010] Preferably, a plurality of first pins are provided at the bottom end of the first layer body, and a plurality of first pin holes are provided at the top end of the second layer body, and the diameters of the first pin holes can fit the first pins.

[0011] Preferably, the diameter of the first pin is smaller than the diameter of the second pin.

[0012] Preferably, a plurality of second pin holes are provided at the top of the main charge structure, and a plurality of second pins are provided at the bottom of the second layer body, and the diameter of the second pin holes can match the second pins.

[0013] (3) Beneficial effects The multi-point synchronous detonation perforating bullet shell structure provided by the present invention realizes central point detonation input and multi-point synchronous detonation output through the shell structure, effectively ensuring the detonation synchronization. At the same time, it has a simple structure, is safe and reliable, and can be applied to the multi-point synchronous detonation of the main charge in the field of petroleum perforation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded view of the shell structure of a multi-point synchronous detonation perforating charge according to an embodiment of the present invention; Figure 2 This is an application diagram of the multi-point synchronous detonation perforating charge shell structure according to an embodiment of the present invention.

[0015] Among them: 1-main body; 2-main charge structure; 3-expanding head; 4-flexible diverter rope; 5-detonating pin; 6-detonating hole; 7-cavity; 8-charge liner. Implementation Method

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] Figure 1 This is an exploded view of the shell structure of a multi-point synchronous detonation perforating charge according to an embodiment of the present invention. Figure 2 This is an application diagram of the multi-point synchronous detonation perforating charge shell structure according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the present invention provides a multi-point synchronous detonation perforating charge shell structure, comprising: A multi-point synchronous detonating device and a main charge structure 2, wherein the multi-point synchronous detonating device is connected to the main charge structure 2, a charge liner 8 is installed inside the main charge structure 2, a cavity 7 is formed between the inner surface of the main charge structure 2 and the outer surface of the charge liner 8, and the interior of the cavity 7 is filled with explosives; The multi-point synchronous detonation device includes a main body 1, a detonating head 3, a flexible diverter rope 4 and a detonating pin 5. The main body 1 has a two-layer structure, namely a first layer main body and a second layer main body. The first layer main body and the second layer main body are connected, and the second layer main body is connected to the main charge structure 2. The center of the first layer body is provided with an expansion head 3, and the second layer body is installed with multiple flexible diversion ropes 4, and the end of each flexible diversion rope 4 is connected to a detonation pin 5; A plurality of explosion holes 6 are provided on the top of the main charge structure 2 , and the explosion holes 6 correspond to and match explosion pins 5 .

[0018] In actual application, the main body 1 has a two-layer structure, namely the first layer main body and the second layer main body. The first layer main body and the second layer main body are both truncated cones. The inscribed circle diameter of the first layer main body is smaller than the inscribed circle diameter of the second layer main body. The bottom end of the first layer main body is provided with multiple first pins, and the top end of the second layer main body is provided with multiple first pin holes. The diameter of the first pin holes can match the first pins. The first layer main body is connected to the second layer main body through the first pins. The bottom end of the second layer main body is provided with multiple second pins. The top end of the main charge structure 2 is provided with multiple second pin holes. The diameter of the second pin holes can match the diameter of the second pins. The second layer main body is connected to the main charge structure 2 through the second pins. The inner wall of the second layer main body is evenly distributed with multiple wiring grooves circumferentially, and the second layer main body is installed with a flexible diversion rope through the wiring grooves.

[0019] It should be noted that the diameter of the first pin is smaller than the diameter of the second pin.

[0020] In this structure, the main charge structure 2 is cylindrical, and the ratio of the outer diameter to the height is 0.6~0.9. The main charge structure 2 is provided with an inner cavity, which includes a first truncated cone cavity, a second truncated cone cavity and a first cylindrical cavity. The inscribed circle diameter of the first truncated cone cavity is smaller than the inscribed circle diameter of the second truncated cone cavity, and the inscribed circle diameter of the second truncated cone cavity is smaller than the inscribed circle diameter of the first cylindrical cavity. A charge liner 8 is placed on the inner side of the main charge structure 2. There is a cavity 7 between the inner side of the main charge structure 2 and the outer side of the charge liner 8. The cavity 7 is filled with explosives, which are special explosives for perforating bullets. A plurality of blasting holes 6 are provided in the center of the top of the main charge structure 2. The size of the blasting holes 6 can match the blasting pins 5, and the number of the blasting holes 6 is the same as the number of the blasting pins 5.

[0021] In actual application, the inner cavity inside the main charge structure 2 is axially extending from the top to the bottom of the structure, and the angles between the straight line and the structure axis range from 45° to 65° and 10° to 15°, respectively. By adjusting the inner cavity structure, the main charge structure 2 can meet the requirements for perforation performance under different conditions. It should be noted that the top thickness of the main charge structure 2 is determined according to the size of the detonating pin 5 to ensure that the detonating pin 5 synchronously detonates the charge. At the same time, under the premise of ensuring suppression safety, the top thickness should not be too thick.

[0022] It should be noted that the multiple explosion holes 6 of the main charge structure 2 are distributed in a ring shape, and the distances between adjacent explosion holes 6 are equal. Because the explosion holes 6 correspond to the explosion pins 5, the explosion holes 6 correspond to the flexible diverter ropes 4. Since the flexible diverter ropes 4 are fixed in the wiring grooves, that is, the explosion holes 6 match the corresponding wiring grooves.

[0023] In practical applications, in order to ensure the symmetrical detonation effect of the explosive on the charge liner, the key to the detonating device is to ensure the synchronization from the input end to the output end. The expansion head 3, as the input end connecting the detonating cord, needs to be set at the center position of the first layer of the main body 1 of the multi-point synchronous detonating device. The expansion head 3 can be used to synchronously detonate multiple flexible diverter ropes 4. The flexible diverter ropes 4 are installed in the wiring grooves uniformly distributed circumferentially on the inner wall of the second layer of the main body 1 of the multi-point synchronous detonating device and are fixed by epoxy resin. The ends of the flexible diverter ropes 4 are connected to the detonating pin 5 to synchronously detonate the charges.

[0024] Epoxy resin, a high molecular polymer with the molecular formula (C11H12O3)n, refers to a general term for a class of polymers containing two or more epoxy groups in the molecule. It is a condensation product of epichlorohydrin and bisphenol A or polyols. Due to the chemical activity of the epoxy group, it can be opened by a variety of compounds containing active hydrogen, and cured and cross-linked to form a network structure. Therefore, it is a thermosetting resin. Bisphenol A epoxy resin not only has the largest output and the most complete variety, but also new modified varieties are still increasing and the quality is constantly improving.

[0025] In practical applications, epoxy resin can be used in coatings, adhesives, and electronic appliances. The classification of epoxy resins has not yet been unified. It is generally classified according to strength, heat resistance level and characteristics. There are 16 main types of epoxy resins, including general-purpose adhesives, structural adhesives, high-temperature resistant adhesives, low-temperature resistant adhesives, adhesives for use in water and on wet surfaces, conductive adhesives, optical adhesives, spot welding adhesives, epoxy resin films, foaming adhesives, strain adhesives, soft material adhesives, sealants, special adhesives, latent curing adhesives, and civil engineering adhesives.

[0026] It should be noted that in this structure, the role of epoxy resin is fixing, so epoxy resin general adhesive or epoxy resin structural adhesive is used.

[0027] In actual application, the detonation sequence of this structure is to detonate the expansion head 3 in the center of the first layer of the main body 1 through the detonator, and transmit it to the detonator pin 5 through multiple flexible diversion ropes 4 in the wiring groove on the inner wall of the second layer of the main body 1, so as to realize the central point detonation input and multi-point synchronous detonation output, thereby forming multi-point synchronous detonation of the main charge, and promoting the formation of high-power penetrating jets.

[0028] It should be noted that in actual application, the shell structure of the multi-point synchronous detonation perforating bullet is detachable, and the two-layer structure of the main body 1 and the main body 1 and the main charge structure 2 are connected by pins, pin-like structures or other methods. The connection between the first layer of the main body and the second layer of the main body, and the connection between the second layer of the main body and the main charge structure 2 have a rubber coating on their connection surfaces to prevent sliding or rotation.

[0029] The following is a detailed description of the field application of this multi-point synchronous detonation perforating bullet shell structure: In this embodiment, the main body 1 is provided with a two-layer structure, namely a first layer main body and a second layer main body. The first layer main body and the second layer main body are connected by a first pin, and the second layer main body and the main charge structure 2 are connected by a second pin. The first layer main body fixes the expansion head 3, and the second layer main body fixes multiple flexible diverter ropes 4. The tail end of each flexible diverter rope 4 is connected to the detonating pin 5, and the detonating pin 5 cooperates with the multiple detonating holes 6 on the main charge structure 2.

[0030] It should be noted that the connection points of the multi-point synchronous detonation perforating charge shell structure are all coated with rubber to prevent sliding or rotation. In addition, multiple flexible diverter ropes 4 are fixed in the wiring groove of the second layer body.

[0031] In this embodiment, a charge liner 8 is placed on the inner side of the main charge structure 2. The gap between the main charge structure 2 and the charge liner 8 is a cavity 7. The interior of the cavity 7 is filled with explosives specifically for perforating bullets. In actual applications, pyrotechnics are assembled separately. On the one hand, this effectively ensures the safety of the detonating device in different occasions and under different usage conditions. On the other hand, it facilitates the processing of wiring grooves and the fixing of flexible diverter ropes, thereby ensuring the detonation reliability of the detonating device.

[0032] In actual application, the input ends of multiple flexible diverter ropes 4 are fixed uniformly and then connected to the expansion head 3. The flexible diverter ropes 4 are coordinated and consistent, and the positions of the detonating pins 5 and the detonating holes 6 are well matched to ensure the synchronization from the input end to the output end of the multi-point synchronous detonating device.

[0033] In this embodiment, the inner cavity of the main charge structure 2 is composed of a plurality of straight lines with different slopes to improve the energy gathering effect, and a plurality of explosion holes 6 are evenly distributed on the top end surface. In actual application, under the premise of effectively ensuring the detonation ability and detonation synchronization, the more explosion holes 6 there are, the closer the detonation effect is to ring detonation.

[0034] In practical applications, the multi-point synchronous detonation perforating charge shell structure provided by the present invention, when multiple evenly distributed points of the shaped charge are synchronously detonated, the spherical detonation waves generated by each detonation point propagate radially, and at the same time, the axial stress waves propagate, colliding and superimposing with each other in the center area of ​​the shaped charge to form an overpressure zone, effectively improving the energy utilization rate of the explosives, and the detonation wave continues to propagate in a trumpet waveform, converging axially in the crushing direction of the charge liner. When the central overpressure zone acts on the charge liner, it effectively increases the crushing speed of the liner wall, increases the total kinetic energy of the penetrator, and thereby improves the penetration capability of the shaped charge.

[0035] The multi-point synchronous detonation perforating bullet shell structure provided by the present invention adopts the shell structure described in the present invention, which can realize central point detonation input and multi-point synchronous detonation output, effectively ensuring the detonation synchronization. At the same time, it has a simple structure, is safe and reliable, and can be applied to the multi-point synchronous detonation of the main charge in the field of petroleum perforation.

[0036] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A multi-point synchronous detonation perforating bullet shell structure, characterized in that: include: A multi-point synchronous detonation device and a main charge structure (2), the multi-point synchronous detonation device being connected to the main charge structure (2), a charge liner (8) being installed inside the main charge structure (2), a cavity (7) being formed between the inner surface of the main charge structure (2) and the outer surface of the charge liner (8), and explosives being filled inside the cavity (7); The multi-point synchronous detonation device comprises a main body (1), an expansion head (3), a flexible diversion rope (4) and a transmission pin (5); the main body (1) has a two-layer structure, namely a first layer main body and a second layer main body, the first layer main body and the second layer main body are connected, and the second layer main body is connected to the main charge structure (2); A bursting head (3) is provided at the center of the first layer body, and a plurality of flexible diversion ropes (4) are installed on the second layer body, with a bursting pin (5) installed at the end of each flexible diversion rope (4); A plurality of explosion transmission holes (6) are provided at the top of the main charge structure (2), and the explosion transmission holes (6) correspond to and match explosion transmission pins (5).

2. The multi-point synchronous detonation perforating charge shell structure according to claim 1 is characterized in that: The outer side of the main charge structure (2) is cylindrical, and a plurality of explosion transmission holes (6) are provided at the center of the top of the main charge structure (2).

3. The multi-point synchronous detonation perforating charge shell structure according to claim 1 is characterized in that: The main charge structure (2) is provided with an inner cavity, which includes a first truncated cone cavity, a second truncated cone cavity and a first cylindrical cavity, the inscribed circle diameter of the first truncated cone cavity is smaller than the inscribed circle diameter of the second truncated cone cavity, and the inscribed circle diameter of the second truncated cone cavity is smaller than the inscribed circle diameter of the first cylindrical cavity.

4. The multi-point synchronous detonation perforating charge shell structure according to claim 1 is characterized in that: A plurality of wiring grooves are evenly distributed in the circumferential direction on the inner wall of the second layer body, and the second layer body is provided with flexible flow diverting cables (4) through the wiring grooves.

5. The multi-point synchronous detonation perforating charge shell structure according to claim 1 is characterized in that: The first layer body and the second layer body are both truncated cones, the inscribed circle diameter of the first layer body is smaller than the inscribed circle diameter of the second layer body, the first layer body is connected to the second layer body via a first pin, and the second layer body is connected to the main charge structure (2) via a second pin.

6. The multi-point synchronous detonation perforating charge shell structure according to claim 5 is characterized in that: A plurality of first pins are disposed at the bottom end of the first layer body, and a plurality of first pin holes are disposed at the top end of the second layer body. The diameters of the first pin holes can match the first pins.

7. The multi-point synchronous detonation perforating charge shell structure according to claim 5 is characterized in that: The diameter of the first pin is smaller than the diameter of the second pin.

8. The multi-point synchronous detonation perforating charge shell structure according to claim 5 is characterized in that: The top of the main charge structure (2) is provided with a plurality of second pin holes, and the bottom of the second layer body is provided with a plurality of second pins, and the diameter of the second pin holes can match the second pins.

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