Suspension type bullet carrier perforator

Abstract

The invention discloses a suspension type bullet carrier perforator. The problems that the distance between two perforations of an existing perforating gun is large, the perforation depth is easily affected when a bullet frame is vibrated, and accidents happen due to the fact that a detonating cord is abraded are mainly solved. The gun is characterized in that the upper gun body (1) and the lower gun body (6) are connected through a single joint (4); a plurality of hanging type bullet rack devices (2) are arranged in the gun body (11), each hanging type bullet rack device (2) comprises a bullet rack (10), the upper end of each bullet rack (10) is connected with an upper positioning disc (8), each upper positioning disc (8) is fixed on the gun body (11) through a positioning key (9) on the side wall, the lower end of each bullet rack (10) is connected to a tensioning device through a screw, and the tensioning device is connected to the gun body (11). According to the hanging type bullet rack perforator, the distance between two column guns of a perforating gun is reduced, so that the perforation distance between the two column guns is reduced, and the loss is reduced; and the bullet rack is fixed more firmly and is not easy to move, so that the perforation effect is improved, and safety accidents are avoided.

Description

Technical Field

[0001] The invention relates to the field of oil and gas well perforation, in particular to a suspended bomb rack perforator. Background Art

[0002] With the continuous development of economy, oil has become an important material that is indispensable in people's daily life, production and economic development. The increasing demand for oil has become inevitable. Therefore, it is particularly important to strengthen the exploration and development of oil fields. Perforating technology is an important part of oil field exploration and development. Perforators are equipment used for perforating oil and gas wells, and the bomb rack and perforating gun are important components of perforators.

[0003] The bullet rack and perforating gun currently in use have the following defects: the two gun columns of the perforating gun are connected by double joints, which makes the distance between the two columns of perforating larger and the loss larger; the fixing method between the bullet rack and the gun body causes the bullet rack to move inside the gun when it is vibrated, causing the perforating bullet to deviate from the blind hole, reducing the perforating effect and affecting the perforating depth; the movement of the bullet rack inside the gun body may wear out the detonating cord and cause a safety accident. Summary of the invention

[0004] In order to overcome the problems of large perforation spacing between two columns of the existing perforating gun, easy impact on perforation penetration when the bomb rack is subjected to vibration, and accidents caused by wear of the detonating cord, the present invention provides a suspended bomb rack perforator, which reduces the distance between the two columns of the perforating gun, thereby reducing the perforation spacing between the two columns and reducing losses; the bomb rack is more firmly fixed and is not prone to movement, thereby improving the perforation effect and avoiding safety accidents.

[0005] The technical solution of the present invention is: a suspended bullet rack perforator, including a gun body, the gun body is divided into an upper gun body and a lower gun body, the upper gun body and the lower gun body are connected by a single joint; a plurality of hanging bullet rack devices are arranged in the gun body, the hanging bullet rack device includes a bullet rack, the upper end of the bullet rack is connected to an upper positioning plate, the upper positioning plate is fixed to the gun body through a positioning key on the side wall, the lower end of the bullet rack is connected to a tensioning device through a screw, and the tensioning device is connected to the gun body.

[0006] A key slot matching with a positioning key is arranged on the inner wall of the gun body, the positioning key is located in a countersunk hole on the outer wall of the upper positioning plate, and a spring is arranged between the bottom of the countersunk hole and the positioning key.

[0007] A first step is arranged on the inner wall of the gun body, and the lower end surface of the upper positioning plate is located on the first step.

[0008] A gun head is arranged on the upper part of the upper positioning plate, and the gun head is threadedly connected to the inside of the gun body.

[0009] A second step is arranged on the inner wall of the gun body, and the gun head is located on the upper part of the second step.

[0010] The tensioning device comprises a lower positioning plate and a pressing body. The spring frame is connected to the lower positioning plate through threads, and the lower positioning plate and the pressing body are connected through threads.

[0011] The inner wall of the gun body is provided with a third step in a direction opposite to the first step, the upper end surface of the pressing body is located on the third step, and the lower end of the pressing body is fixed by the gun tail.

[0012] The inner wall of the gun body is provided with a fourth step in the same direction as the third step, the gun tail is located below the fourth step, and the gun tail is threadedly connected to the inside of the gun body.

[0013] A through hole is provided at the center of the upper positioning plate and the pressing body, and the detonating cord passes through the through hole and is connected with the perforating bullet inside the bomb rack.

[0014] Both ends of the single joint are provided with hanging bomb rack devices respectively, and a locking device is provided inside the hanging bomb rack device. The locking device is connected to the straightening body, and the detonating cord passes through the locking device and the straightening body.

[0015] The present invention has the following beneficial effects: Due to the adoption of the above scheme, a single joint structure is adopted between the upper and lower gun bodies, so that the perforation spacing between the two columns can be reduced to 40mm, reducing the complexity of the gun connection, saving materials and reducing losses. The bomb rack is basically coaxial with the gun body, the explosion height in the gun is consistent, and it can effectively prevent the detonating cord from contacting and rubbing with the gun body and breaking the skin, thereby improving the stability of perforation; the positioning key is used for positioning, and the gap between the positioning key and the keyway on the gun body is small, the positioning is accurate, the precision is high, and the positioning key is convenient for on-site gun connection construction, thereby improving work efficiency; the bomb rack is fastened in the gun body, and even if it is subjected to vibration or impact of a drilling drill or a sliding drill, the bomb rack will not move, thereby avoiding the wear of the detonating cord and causing damage to the detonating cord; and because it is a tensioning structure, the bomb rack will not bend under force, thereby greatly improving safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a connection diagram of the upper and lower gun bodies.

[0017] In the figure, 1-upper gun body, 2-hanging bomb rack device, 3-locking device, 4-single joint, 5-rightening body, 6-lower gun body, 7-gun head, 8-upper positioning plate, 9-positioning key, 10-bomb rack, 11-gun body, 12-perforating bullet, 13-lower positioning plate, 14-pressing body, 15-gun tail. Implementation

[0018] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 , Figure 2As shown, a hanging bomb rack perforator includes a gun body 11, wherein the gun body 11 is divided into an upper gun body 1 and a lower gun body 6, wherein the upper gun body 1 and the lower gun body 6 are connected via a single joint 4, wherein the upper gun body 1 and the lower gun body 6 are respectively connected to the two ends of the single joint 4 via threads. This single joint structure can reduce the perforation spacing between the two columns to 40 mm, thereby reducing the complexity of the gun connection, saving materials, and reducing losses. Hanging bomb rack devices 2 are respectively provided at both ends of the single joint 4 in the gun body 11, and a locking device 3 is provided inside the hanging bomb rack device 2, wherein the locking device 3 is connected to a straightening body 5, and the detonating cord passes through the locking device 3 and the straightening body 5.

[0019] The hanging bomb rack device 2 includes a bomb rack 10, the upper end of which is connected to the upper positioning plate 8 by a thread, and a screw is connected between the bomb rack 10 and the upper positioning plate 8 to prevent the two from rotating relative to each other. A first step is provided on the inner wall of the gun body 11, and the lower end surface of the upper positioning plate 8 is located on the first step to limit the upper positioning plate 8. A gun head 7 is provided on the upper part of the upper positioning plate 8, and the gun head 7 is threadedly connected to the inside of the gun body 11. A second step is provided on the inner wall of the gun body 11, and the second step is located above the first step. The inner diameter at the second step is larger than the inner diameter at the first step, and the gun head 7 is located on the upper part of the second step. Since the inner diameter at the gun head of the gun body 11 is larger than the inner diameter at the bomb rack, the bomb rack 10 can be installed from the top. A countersunk hole is opened on the outer wall of the upper positioning plate 8, and a positioning key 9 is provided in the countersunk hole, and a spring is provided between the bottom of the countersunk hole and the positioning key 9. The inner wall of the gun body 11 is provided with a key slot that matches the positioning key 9. When the positioning key 9 moves to the key slot of the gun body 11 along with the upper positioning plate 8, the positioning key 9 pops out under the action of the spring, and the end enters the key slot of the gun body 11 to limit the upper positioning plate 8 and the bomb rack 10. Since the gap between the positioning key 9 and the key slot on the gun body 11 is small, only 0.1mm, the positioning is accurate and the precision is high. A through hole is opened at the center of the upper positioning plate 8, and the through hole can be passed through by the detonation shell on one hand, and the tool can also be inserted into the through hole to disassemble the bomb rack 10.

[0020] The lower end of the bomb rack 10 is connected to the tensioning device by screws, and the tensioning device is connected to the gun body 11. The tensioning device includes a lower positioning plate 13 and a compression body 14. The bomb rack 10 is connected to the lower positioning plate 13 by threads, and radial screws are provided at the connection. The lower positioning plate 13 and the compression body 14 are threadedly connected. The inner wall of the gun body 11 is provided with a third step in the opposite direction to the first step. The upper end surface of the compression body 14 is located on the third step, and the lower end of the compression body 14 is fixed by a gun tail 15. The inner wall of the gun body 11 is provided with a fourth step in the same direction as the third step. The gun tail 15 is located below the fourth step, and the gun tail 15 is threadedly connected to the inside of the gun body 11. The gun tail 15 can compress the compression body 14 on the third step. A through hole is opened at the center of the upper positioning plate 8 and the compression body 10, and the detonating cord passes through the through hole and is connected to the perforating bullet 12 inside the bomb rack 10.

[0021] When assembling the perforator, first insert the lower end of the cartridge holder 10, the lower positioning plate 13 and the pressing body 14 from the upper end of the gun body 11. When the positioning key 9 enters the keyway on the inner wall of the gun body 11, the pressing body 14 is rotated to tighten the cartridge holder.

[0022] The bomb rack 10 of the perforator is basically coaxial with the gun body 11, and the explosion height in the gun is consistent, which can effectively prevent the detonating cord from contacting and rubbing with the gun body and breaking the skin, thereby improving the stability of perforation. The positioning key 9 is used for positioning, and the gap between the positioning key 9 and the keyway on the gun body is only about 0.1mm, which is accurate and has high precision. The bomb rack is fastened in the gun body, and even if it is subjected to vibration or impact from the drilling or slipping drilling, the bomb rack will not move, thereby avoiding the wear of the detonating cord; and because it is a tensioning structure, the bomb rack will not bend under force, which greatly improves safety and reliability.

Claims

1. A suspended-type perforator, comprising a gun body (11), wherein the gun body (11) is divided into an upper gun body (1) and a lower gun body (6), characterized in that: The upper gun body (1) and the lower gun body (6) are connected via a single joint (4); a plurality of hanging bomb rack devices (2) are arranged in the gun body (11), the hanging bomb rack device (2) comprising a bomb rack (10), the upper end of the bomb rack (10) is connected to an upper positioning plate (8), the upper positioning plate (8) is fixed to the gun body (11) via a positioning key (9) on the side wall, the lower end of the bomb rack (10) is connected to a tensioning device via a screw, and the tensioning device is connected to the gun body (11).

2. The suspended bomb rack perforator according to claim 1, characterized in that: A keyway matching the positioning key (9) is provided on the inner wall of the gun body (11); the positioning key (9) is located in a countersunk hole on the outer wall of the upper positioning plate (8); and a spring is provided between the bottom of the countersunk hole and the positioning key (9).

3. The suspended bomb rack perforator according to claim 2, characterized in that: A first step is provided on the inner wall of the gun body (11), and the lower end surface of the upper positioning plate (8) is located on the first step.

4. The suspended bomb rack perforator according to claim 3 is characterized in that: A gun head (7) is provided on the upper portion of the upper positioning plate (8), and the gun head (7) is threadedly connected to the inside of the gun body (11).

5. The suspended bomb rack perforator according to claim 4, characterized in that: A second step is provided on the inner wall of the gun body (11), and the gun head (7) is located on the upper part of the second step.

6. The suspended bomb rack perforator according to claim 1, characterized in that: The tensioning device comprises a lower positioning plate (13) and a pressing body (14); the spring holder (10) is connected to the lower positioning plate (13) by means of threads; and the lower positioning plate (13) and the pressing body (14) are connected by threads.

7. The suspended bomb rack perforator according to claim 6, characterized in that: The inner wall of the gun body (11) is provided with a third step in a direction opposite to the first step, the upper end surface of the pressing body (14) is located on the third step, and the lower end of the pressing body (14) is fixed by a gun tail (15).

8. The suspended bomb rack perforator according to claim 7, characterized in that: The inner wall of the gun body (11) is provided with a fourth step in the same direction as the third step, the gun tail (15) is located below the fourth step, and the gun tail (15) is threadedly connected to the inside of the gun body (11).

9. The suspended bomb rack perforator according to claim 8, characterized in that: A through hole is formed at the center of the upper positioning plate (8) and the pressing body (10), and the detonating cord passes through the through hole and is connected to the perforating bullet (12) inside the bullet rack (10).

10. The suspended bomb rack perforator according to claim 1, characterized in that: The two ends of the single joint (4) are respectively provided with hanging bomb rack devices (2), the hanging bomb rack device (2) is provided with a locking device (3) inside, the locking device (3) is connected to a straightening body (5), and the detonating cord passes through the locking device (3) and the straightening body (5).

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