Blanking plug

Abstract

The utility model discloses a blanking plug which comprises an upper connector, a lower connector, a balance cylinder, a ball seat, a plug and a steel ball. The two ends of the balance cylinder are arranged on the upper connector and the lower connector in a sleeved mode respectively. The ball seat is arranged in the balance cylinder in a sleeved mode. The plug is installed in the balance cylinder and abuts against one side of the ball seat. And the steel ball is placed on the other side of the ball seat and forms a sealing surface with the ball seat. The upper connector, the lower connector and the balance cylinder are arranged to form a foundation structure, the ball seat, the plug and the steel ball are utilized to enable the steel ball to be pressed to complete follow-up upper and lower sealing isolation after the steel ball is put in, only the blanking plug needs to be installed at the lower end of a packer, and construction cost can be reduced on the premise that good using effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology, specifically to a plugging device. Background Technology

[0002] The existing packers and bridge plugs are two different tools. The function of the packer is to seal the annular space between the tubing and the casing; the bridge plug is used to seal the casing, so that the upper and lower parts of the casing are not connected, and it is used for temporary or permanent sealing. In order to save costs and expand functionality, the packer is generally converted into a bridge plug. The methods generally involve directly connecting a dead plug to the lower end of the packer to achieve the sealing function; or installing a ball-throwing sleeve between the lower part of the packer and the dead plug. Since the sleeve is initially open, it can solve the problem of the internal and external channels not being connected during the lowering process. However, the former causes the internal and external channels of the packer to be disconnected during the lowering process, requiring intermittent injection of liquid into the packer, which increases the construction time. The latter requires pressurizing the ball seat after the ball is thrown to close the internal and external channels. When the ball seat moves down to just completely close the channel, a sealed space filled with liquid is formed between the ball and the lower dead plug. Because the compressibility of the liquid is extremely small, there is a risk that the internal and external channels cannot be completely closed, and the overall sealing cannot be achieved.

[0003] In other words, the above structure cannot reduce construction costs while ensuring good performance. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a blocker that solves the technical problem that existing technologies cannot reduce construction costs while ensuring good performance.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a plugging device, including an upper connector, a lower connector, a balance cylinder, a ball seat, a plug, and a steel ball; the two ends of the balance cylinder are respectively sleeved with the upper connector and the lower connector; the ball seat is sleeved inside the balance cylinder; the plug is installed inside the balance cylinder and abuts against one side of the ball seat; the steel ball is placed on the other side of the ball seat and forms a sealing surface with the ball seat.

[0007] In some embodiments, the balance cylinder is detachably connected to both the upper connector and the lower connector.

[0008] In some embodiments, the balance cylinder is threadedly connected to both the upper connector and the lower connector.

[0009] In some embodiments, a plurality of through holes are evenly distributed circumferentially in the middle of the outer wall of the balance cylinder.

[0010] In some embodiments, the ball seat is a cylindrical structure.

[0011] In some embodiments, the plug is a solid structure.

[0012] In some embodiments, a connecting member is provided between the balance cylinder, the ball seat, and the plug.

[0013] In some embodiments, the connector is a shear pin.

[0014] In some embodiments, a limiting member is further included, which is installed inside the balance cylinder and is used to limit the displacement of the ball seat.

[0015] In some embodiments, the limiting member is a C-shaped retaining ring.

[0016] Compared with the prior art, the packer provided by this utility model constructs a basic packing structure by setting an upper connector, a lower connector and a balance cylinder; furthermore, by using the setting and sealing of ball seat, plug and steel ball, the packer can be connected inside and outside when inserted, can be knocked down and can be sealed after setting, thus reducing construction costs while ensuring good performance. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a blocker provided in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 100. Upper connector; 200. Lower connector; 300. Balance cylinder; 310. Through hole; 400. Ball seat; 500. Plug; 600. Steel ball; 700. Connector; 710. Shear pin; 800. Limiting component; 810. C-ring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] To address the technical problem of not being able to reduce construction costs while ensuring good performance, this invention provides a blocker that can reduce construction costs.

[0022] It should be noted that the plug described in this utility model is used in, but not limited to, downhole tools. For ease of explanation, this utility model only uses the application of a plug to downhole tools as an example. The principle of the plug applied to other types of equipment is essentially the same as that applied to downhole tools, and will not be described in detail here.

[0023] Please see Figure 1 , Figure 1 This is a cross-sectional view of a plugging device according to an embodiment of the present invention. The plugging device includes an upper connector 100, a lower connector 200, a balance cylinder 300, a ball seat 400, a plug 500, and a steel ball 600. The two ends of the balance cylinder 300 are respectively sleeved with the upper connector 100 and the lower connector 200. The ball seat 400 is sleeved inside the balance cylinder 300. The plug 500 is installed inside the balance cylinder 300 and abuts against one side of the ball seat 400. The steel ball 600 is placed on the other side of the ball seat 400 and forms a sealing surface with the ball seat 400.

[0024] In this embodiment, a basic blocking structure is constructed by setting an upper connector 100, a lower connector 200, and a balance cylinder 300. Furthermore, by using the ball seat 400, the plug 500, and the steel ball 600 for setting and sealing, the packer can be connected internally and externally during insertion, can be knocked down, and can be sealed after setting, thereby reducing construction costs while ensuring good performance.

[0025] In one embodiment, please refer to Figure 1 The balance cylinder 300, the upper connector 100, and the lower connector 200 are all detachable connections.

[0026] In one embodiment, please refer to Figure 1 The balance cylinder 300 is connected to the upper connector 100 and the lower connector 200 by threads.

[0027] In this embodiment, the balance cylinder 300 is threadedly connected to the upper connector 100 and the lower connector 200, which facilitates the maintenance of the balance cylinder 300 and the upper connector 100 and the lower connector 200.

[0028] In one embodiment, please refer to Figure 1 The outer wall of the balance cylinder 300 has several through holes 310 evenly distributed in the circumferential direction.

[0029] In one embodiment, please refer to Figure 1 The ball seat 400 has a cylindrical structure.

[0030] In one embodiment, please refer to Figure 1 The 500 plug is a solid structure.

[0031] In one embodiment, please refer to Figure 1 A connector 700 is provided between the balance cylinder 300, the ball seat 400, and the plug 500.

[0032] In this embodiment, the connector 700 ensures the stable installation of the balance cylinder 300, the ball seat 400, and the plug 500, and also lays the foundation for subsequent shearing after pressure testing and movement limitation within a certain range.

[0033] In one embodiment, please refer to Figure 1 The connector 700 is a shear pin 710.

[0034] In one embodiment, please refer to Figure 1 It also includes a limiting component 800, which is installed inside the balance cylinder 300 and is used to limit the displacement of the ball seat 400.

[0035] In one embodiment, please refer to Figure 1 The limiting component 800 is a C-type retaining ring 810.

[0036] In this embodiment, when the ground pressure reaches a certain value, the shear pin 710 will be sheared, and the steel ball 600, ball seat 400, C-shaped retaining ring 810 and plug 500 will move down together. The ball seat 400 will seal the corresponding channel and complete the internal and external isolation. At the same time, the C-shaped retaining ring 810 will enter the plug 500. The C-shaped retaining ring 810 will prevent the ball seat 400 and plug 500 from moving down, and the elastic structure of the end of the plug 500 away from the steel ball 600 will prevent the plug 500 from moving up. Overall, the plug 500 will not be able to move up or down, and the sealing and isolation between the upper and lower parts will be maintained.

[0037] To better understand this utility model, the following is combined with... Figure 1 The technical solution of this utility model is described in detail below:

[0038] First, the aforementioned plug is installed at the lower end of the packer, separated from the packer by at least one oil pipe. Then, it is lowered along with the packer (except for the steel ball 600). Next, after it is in place, a ball is thrown from the ground. The steel ball 600 lands on the inclined surface at the upper end of the ball seat 400, and the ground is pressed down. When the pressure reaches the preset value, the shear pin 710 is sheared. The steel ball 600, ball seat 400, C-shaped retaining ring 810, and plug 500 move downwards together. The ball seat 400 seals the corresponding channel and completes the internal and external isolation. Simultaneously, the C-shaped retaining ring 810 enters the plug 500, preventing the ball seat 400 and plug 500 from moving downwards. The elastic structure at the end of the plug 500 away from the steel ball 600 prevents the plug 500 from moving upwards. Overall, the plug 500 cannot move up or down, maintaining a sealed isolation between the upper and lower parts. The above structure effectively avoids the risks of internal and external disconnection and the inability to completely close internal and external channels, and can achieve overall sealing, which can reduce construction costs while ensuring good performance.

[0039] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A blocker, characterized in that, include: Top connector; Lower connector; A balancing cylinder, the two ends of which are respectively sleeved with the upper connector and the lower connector; A ball seat, which is fitted inside the balance cylinder; A plug, wherein the plug is installed inside the balance cylinder and abuts against one side of the ball seat; as well as A steel ball is placed on the other side of the ball seat and forms a sealing surface with the ball seat.

2. The plugging device according to claim 1, characterized in that, The balance cylinder is detachably connected to both the upper connector and the lower connector.

3. A plugging device according to claim 2, characterized in that, The balance cylinder is threadedly connected to both the upper connector and the lower connector.

4. A plugging device according to claim 1, characterized in that, The outer wall of the balance cylinder has several through holes evenly distributed circumferentially in the middle.

5. A plugging device according to claim 1, characterized in that, The ball seat has a cylindrical structure.

6. A plugging device according to claim 1, characterized in that, The plug is a solid structure.

7. A plugging device according to claim 1, characterized in that, Connectors are provided between the balance cylinder, the ball seat, and the plug.

8. A plugger according to claim 7, characterized in that, The connector is a shear pin.

9. A plugging device according to claim 1, characterized in that, It also includes a limiting member, which is installed inside the balance cylinder and is used to limit the displacement of the ball seat.

10. A plugger according to claim 9, characterized in that, The limiting component is a C-type retaining ring.

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