A downhole tubing passage opening device

Abstract

This utility model belongs to the field of well opening devices, specifically a well casing channel opening device, including a housing, with multiple shaped charge shells installed in the middle of the housing; the shaped charge shells are arranged in an inverted V shape; the interior of the shaped charge shells is filled with explosives; adjacent shaped charge shells are staggered; connecting shells are provided on both sides of the shaped charge shells; explosive columns are installed inside the connecting shells; the explosive columns and shaped charge shells are arranged correspondingly; multiple connecting plates are fixedly connected to the middle of the housing; each shaped charge shell is located between a pair of connecting plates; a sealing strip is fixedly connected between adjacent pairs of connecting plates; sealing strips are fixedly connected to both sides of the connecting plates; the sealing strips and the housing are also fixedly connected; by setting the connecting plates, sealing strips, and elastic cloth, the device can seal and protect the explosives and explosive columns, reducing their direct contact with the outside environment before detonation, and reducing the possibility of them being difficult to detonate due to moisture.

Description

Technical Field

[0001] This utility model relates to the field of well opening devices, specifically a well casing passage opening device. Background Technology

[0002] Perforation is an operation performed after cementing an oil and gas well. According to the development plan, a specialized oil well perforator is used to penetrate the casing wall and cement sheath at the target formation, creating a connecting passage from the target formation to the wellbore inside the casing. The quality of the perforation operation directly affects the production efficiency and economic benefits of the oil and gas well.

[0003] Perforation operations are typically carried out via cables or pipes, transporting the perforating gun to the designated perforation layer. During transport, a magnetic locator tracks the casing coupling position to ensure the perforating gun is accurately aligned with the perforation layer. Once the perforating gun reaches the designated position, a signal from the magnetic locator is received via ground instruments to confirm its accurate positioning. If the positional deviation is significant, the perforating gun's position must be adjusted until the requirements are met. After confirming accurate positioning, a detonation signal is sent to the perforator via ground instruments, detonating the perforating projectile. The high-temperature, high-pressure metal jet generated by the explosion penetrates the casing wall, cement sheath, and formation, forming a borehole.

[0004] When using existing perforating guns, they are usually sent down into the well along with the tubing string. During use and observation, it has been found that because the underground environment is relatively complex and the air generally contains high moisture content, the explosives inside the perforating gun will become damp, which will affect the stability of the explosive detonation.

[0005] Therefore, a downhole tubing channel opening device is proposed to address the above problems. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A downhole tubing channel opening device of this utility model includes a housing, with multiple shaped charge shells installed in the middle of the housing; the shaped charge shells are arranged in an inverted V shape; the interior of each shaped charge shell is filled with explosive; adjacent shaped charge shells are staggered; connecting shells are provided on both sides of each shaped charge shell; explosive columns are installed inside each connecting shell; the explosive columns and shaped charge shells are arranged correspondingly; multiple connecting plates are fixedly connected to the middle of the housing; each shaped charge shell is located between a pair of connecting plates; a sealing strip is fixedly connected between adjacent pairs of connecting plates; sealing strips are fixedly connected to both sides of each connecting plate; the sealing strips and the housing are also fixedly connected; by setting the connecting plates, sealing strips, and elastic cloth, the device can seal and protect the explosive and explosive columns, reducing their direct contact with the outside world before detonation and reducing the possibility of them being difficult to detonate due to moisture.

[0008] Preferably, a plurality of drying boxes are fixedly connected to the middle of the connecting plate; the drying boxes are located inside the elastic cloth; by setting the drying boxes, the drying boxes can absorb the moisture present in the elastic cloth, further reduce the air humidity inside the elastic cloth, and also improve the protective effect of the device on explosives and explosive charges.

[0009] Preferably, multiple wax blocks are fixedly connected to the middle of the connecting plate; the wax blocks are located between adjacent drying boxes; by setting the wax blocks, the wax blocks have a certain degree of hygroscopicity, which can further assist the drying box in absorbing moisture inside the elastic cloth. At the same time, the wax blocks can also provide additional support for the elastic cloth, so that the elastic cloth can be kept away from the energy-concentrating shell, and the contact between moisture and explosives is reduced, further improving the device's moisture-proof effect on explosives and explosive charges.

[0010] Preferably, each of the elastic fabrics has a pair of air bladders symmetrically arranged inside; the air bladders are located on both sides of the energy-concentrating shell; by setting the air bladders, the air bladders can be filled with gas and then inserted into the elastic fabric, so that the elastic fabric will receive additional support when working, further improving the tension of the elastic fabric surface and reducing the moisture accumulated on the inner wall of the elastic fabric due to wrinkles.

[0011] Preferably, a plurality of heat insulation pads are fixedly attached to the surface of the shell; the heat insulation pads and the airbag are correspondingly arranged; by setting the heat insulation pads, the heat insulation pads have low thermal conductivity, so that the heat transferred to the outer wall of the shell after the explosive and explosive charge are detonated will be isolated by the heat insulation pads, reducing the direct heat exchange between the airbag and the shell, reducing the possibility of the airbag rupturing due to the expansion of the internal gas caused by high temperature, and extending the service life of the airbag.

[0012] Preferably, the elastic fabric surface is fixed with multiple reinforcing ribs; the reinforcing ribs are arranged in a circumferential array; by setting the reinforcing ribs, the elastic fabric will be subjected to the tensile force of the reinforcing ribs when working, which improves the structural strength of the elastic fabric surface. At the same time, after the elastic fabric is punctured by the jet formed by explosives, it can remain stable under the tensile force of the reinforcing ribs, which improves the tear resistance of the elastic fabric and reduces the friction between the elastic fabric and other components after puncture.

[0013] The advantages of this utility model are:

[0014] 1. The downhole tubing channel opening device of this utility model, by setting a connecting plate, sealing strip and elastic cloth, enables the device to seal and protect the explosive and explosive column, reduce its direct contact with the outside world before detonation, and reduce the situation that it is difficult to detonate due to moisture.

[0015] 2. The downhole tubing channel opening device of this utility model, by setting a drying box, can absorb the moisture present in the elastic cloth, further reduce the air humidity in the elastic cloth, and also improve the device's protective effect against explosives and explosive charges. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the main body of this utility model;

[0018] Figure 2 This is a schematic diagram of the energy-concentrating shell in this utility model;

[0019] Figure 3 This is a schematic diagram of the elastic fabric in this utility model;

[0020] Figure 4 This is a schematic diagram of the connecting shell in this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the airbag in this utility model.

[0022] In the diagram: 1. Shell; 12. Circulating shell; 13. Explosive; 14. Connecting shell; 15. Explosive column; 16. Connecting plate; 17. Sealing strip; 18. Elastic cloth; 2. Drying box; 3. Wax block; 4. Airbag; 5. Heat insulation pad; 6. Reinforcing rib. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] Specific implementation examples are given below.

[0025] Please see Figures 1 to 5As shown in the figure, a downhole tubing channel opening device according to an embodiment of the present invention includes a housing 1, wherein a plurality of shaped charge shells 12 are installed in the middle of the housing 1; the shaped charge shells 12 are arranged in an inverted V shape; the interior of the shaped charge shells 12 is filled with explosives 13; adjacent shaped charge shells 12 are staggered; connecting shells 14 are provided on both sides of the shaped charge shells 12; explosive columns 15 are installed inside the connecting shells 14; the explosive columns 15 and the shaped charge shells 12 are arranged correspondingly; a plurality of connecting plates 16 are fixedly connected to the middle of the housing 1; each of the... The shaped charge shell 12 is located between a pair of connecting plates 16; a sealing strip 17 is fixedly connected between adjacent pairs of connecting plates 16; sealing strips 17 are fixedly connected to both sides of the connecting plates 16; the sealing strips 17 and the shell 1 are also fixedly connected; during operation, the firing gun can be transmitted to a predetermined position via cable, and then a command can be sent from the ground to detonate the explosive 13 and the explosive column 15. After the explosive 13 detonates, it will quickly crush the shaped charge shell 12 and collide with and focus to form a continuous metal jet that moves at high speed along the normal direction of the shaped charge shell 12. The jet head encounters When the jet enters the tubing, due to its high velocity (nearly 4500 m / s), the collisions between the jets can be approximated as fluid collisions. The jet head easily penetrates into the tubing, and subsequent metal jets repeat this process until the tubing is cut open, forming the desired channel. Simultaneously, the high-pressure impact generated after the explosive column 15 detonates acts on the tubing, reaching tens of thousands of megapascals in magnitude. This pressure far exceeds the yield strength of the tubing, thus enhancing the channel-opening effect. Before detonation, the connecting plate 16, sealing strip 17, and elastic cloth 1... The sealing system consisting of 8 provides sealing protection for the shaped charge shell 12 and the explosive charge 15, making it difficult for moisture in the downhole air to enter the interior of the elastic cloth 18. This reduces the possibility of moisture contamination of the explosive charge 13 and the explosive charge 15 inside the shaped charge shell 12, ensuring that the shaped charge shell 12 and the explosive charge 15 can be stably detonated. By setting the connecting plate 16, sealing strip 17, and elastic cloth 18, the device can seal and protect the explosive charge 13 and the explosive charge 15, reducing their direct contact with the outside world before detonation and reducing the possibility of them being difficult to detonate due to moisture.

[0026] Please see Figure 3 and Figure 5 As shown, multiple drying boxes 2 are fixedly connected to the middle of the connecting plate 16; the drying boxes 2 are located inside the elastic cloth 18; by setting the drying boxes 2, which contain desiccants, the moisture present inside the elastic cloth 18 during installation can be absorbed, further improving the dryness of the internal environment of the elastic cloth 18 and ensuring the appropriate working temperature of the explosive 13 and the explosive charge 15; by setting the drying boxes 2, the drying boxes 2 can absorb the moisture present inside the elastic cloth 18, further reducing the air humidity inside the elastic cloth 18, and also improving the protective effect of the device on the explosive 13 and the explosive charge 15.

[0027] Please see Figure 5 As shown, multiple wax blocks 3 are fixedly connected to the middle of the connecting plate 16; the wax blocks 3 are located between adjacent drying boxes 2; by setting the wax blocks 3, the wax blocks 3 have a certain degree of hygroscopicity, which can further assist the drying box 2 in absorbing the moisture inside the elastic cloth 18. At the same time, the wax blocks 3 can also provide additional support for the elastic cloth 18, so that the elastic cloth 18 can be kept away from the energy-concentrating shell 12, and the contact between moisture and explosive 13 is reduced, further improving the moisture-proof effect of the device on explosive 13 and explosive column 15.

[0028] Please see Figure 5 As shown, each of the elastic fabrics 18 has a pair of air bladders 4 symmetrically arranged inside; the air bladders 4 are located on both sides of the energy-concentrating shell 12; by setting the air bladders 4, the air bladders 4 can be filled with gas and then inserted into the elastic fabric 18, so that the elastic fabric 18 will receive additional support when working, further improving the tension of the surface of the elastic fabric 18 and reducing the moisture accumulated on the inner wall of the elastic fabric 18 due to wrinkles.

[0029] Please see Figure 3 As shown, multiple heat insulation pads 5 are fixed to the surface of the shell 1; the heat insulation pads 5 and the airbag 4 are arranged correspondingly; by setting the heat insulation pads 5, the heat insulation pads 5 have low thermal conductivity, so that the heat transferred to the outer wall of the shell 1 after the explosive 13 and the explosive column 15 are detonated will be isolated by the heat insulation pads 5, reducing the direct heat exchange between the airbag 4 and the shell 1, reducing the possibility of the airbag 4 rupturing due to the expansion of the internal gas caused by high temperature, and extending the service life of the airbag 4.

[0030] Please see Figure 1 As shown, multiple reinforcing ribs 6 are fixed to the surface of the elastic cloth 18; the reinforcing ribs 6 are arranged in a circumferential array; by setting the reinforcing ribs 6, the elastic cloth 18 will be subjected to the tensile force of the reinforcing ribs 6 when working, which improves the structural strength of the surface of the elastic cloth 18. At the same time, after the elastic cloth 18 is penetrated by the jet formed by the explosive 13, it can also remain stable under the tensile force of the reinforcing ribs 6, which improves the tear resistance of the elastic cloth 18 and reduces the friction between the elastic cloth 18 and other components after penetration.

[0031] Working principle: The firing gun is transmitted to a predetermined position via cable. A command can then be sent from the ground to detonate explosive 13 and explosive column 15. After the explosion of explosive 13, it rapidly crushes and collides with the shaped charge shell 12, focusing to form a continuous high-speed metal jet moving along the normal direction of the shaped charge shell 12. When the jet head encounters the column, due to its high velocity (nearly 4500 m / s), the collision between them can be approximated as a fluid collision, and the jet head easily penetrates into the column. Subsequent metal jets repeat the above process until the column is cut open, forming the required channel. Simultaneously, the high-pressure impact generated after the explosion of explosive column 15 acts on the column, reaching pressures of tens of thousands of megapascals. The force far exceeds the yield strength of the tubing string, thus enhancing the channel opening effect on the tubing string. The sealing system composed of the pre-detonation connecting plate 16, sealing strip 17, and elastic cloth 18 provides sealing protection for the shaped charge shell 12 and the explosive charge 15, making it difficult for moisture in the downhole air to enter the interior of the elastic cloth 18. This reduces the possibility of moisture contamination of the explosive charge 13 and explosive charge 15 inside the shaped charge shell 12, ensuring stable detonation of the shaped charge shell 12 and explosive charge 15. Furthermore, the installation of a drying box 2, containing a desiccant, absorbs moisture present inside the elastic cloth 18 during installation, further improving the dryness of the internal environment of the elastic cloth 18 and ensuring the stability of the explosive charge 13 and explosive charge. 15. The suitability of the working temperature; By setting wax block 3, which has a certain degree of hygroscopicity, it can further assist the drying box 2 in absorbing moisture inside the elastic cloth 18. At the same time, wax block 3 can also provide additional support for the elastic cloth 18, allowing the elastic cloth 18 to be kept away from the energy-concentrating shell 12, and reducing the contact between moisture and explosive 13; By setting airbag 4, the airbag 4 can be filled with gas and then inserted into the elastic cloth 18, so that the elastic cloth 18 will receive additional support during operation, further improving the tension of the surface of the elastic cloth 18 and reducing the moisture accumulation on the inner wall of the elastic cloth 18 due to wrinkles; By setting heat insulation pad 5, the heat insulation pad 5 has a low temperature... The thermal conductivity ensures that the heat transferred to the outer wall of the casing 1 after the detonation of the explosive 13 and the explosive charge 15 is isolated by the heat insulation pad 5, reducing direct heat exchange between the airbag 4 and the casing 1, reducing the possibility of the airbag 4 rupturing due to internal gas expansion caused by high temperature, and extending the service life of the airbag 4; by setting the reinforcing rib 6, the elastic cloth 18 will be subjected to the tensile force of the reinforcing rib 6 during operation, improving the structural strength of the surface of the elastic cloth 18. At the same time, even after the elastic cloth 18 is punctured by the jet formed by the explosive 13, it can remain stable under the tensile force of the reinforcing rib 6, improving the tear resistance of the elastic cloth 18 and reducing the friction between the elastic cloth 18 and other components after puncture.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A downhole string passage opening device comprising a housing (1), characterized in that: Multiple shaped charge shells (12) are installed in the middle of the housing (1); the shaped charge shells (12) are arranged in an inverted V shape; the shaped charge shells (12) are filled with explosives (13); adjacent shaped charge shells (12) are staggered; connecting shells (14) are provided on both sides of the shaped charge shells (12); explosive columns (15) are installed inside the connecting shells (14); the explosive columns (15) and the shaped charge shells (12) are arranged correspondingly; multiple connecting plates (16) are fixedly connected to the middle of the housing (1); each shaped charge shell (12) is located between a pair of connecting plates (16); a sealing strip (17) is fixedly connected between adjacent pairs of connecting plates (16); a sealing strip (17) is fixedly connected to both sides of the connecting plate (16); the sealing strip (17) and the housing (1) are fixedly connected.

2. A downhole string passage opening device according to claim 1, characterized in that: Multiple drying boxes (2) are fixedly connected to the middle of the connecting plate (16); the drying boxes (2) are located inside the elastic cloth (18).

3. A downhole string passage opening device according to claim 2, characterised in that: Multiple wax blocks (3) are fixedly connected to the middle of the connecting plate (16); the wax blocks (3) are located between adjacent drying boxes (2).

4. A downhole string passage opening device according to claim 3, characterized in that: Each of the elastic fabrics (18) has a pair of airbags (4) symmetrically arranged inside; the airbags (4) are located on both sides of the energy-concentrating shell (12).

5. A downhole string passage opening device according to claim 4, characterised in that: Multiple heat insulation pads (5) are fixed to the surface of the housing (1); the heat insulation pads (5) and the airbag (4) are arranged accordingly.

6. A downhole tubing passage opening device according to claim 5, characterized in that: The elastic fabric (18) has multiple reinforcing ribs (6) fixed to its surface; the reinforcing ribs (6) are arranged in a circumferential array.

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