Composite rubber plug mud scraping structure

Abstract

The utility model relates to the technical field of petroleum downhole tools, in particular to a composite rubber plug mud scraping structure. Comprising a rubber plug main body and mud scraping wings, the mud scraping wings are connected with the rubber plug main body; the mud scraping wings surround the periphery of the rubber plug main body; the mud scraping wings comprise a main mud scraping wing and an auxiliary mud scraping wing; the auxiliary mud scraping wing and the main mud scraping wing are sequentially arranged along the moving direction of the rubber plug main body; and the pressure bearing capacity of the auxiliary mud scraping wings is smaller than that of the main mud scraping wings. In the prior art, the shape of a mud scraping wing on a rubber plug is kept consistent, so that the adaptability of the rubber plug is poor when the rubber plug faces different underground working conditions. Compared with the prior art, the main mud scraping wing and the auxiliary mud scraping wing are combined. The pressure bearing capacity of the auxiliary mud scraping wing is smaller than that of the main mud scraping wing, so that the deformation conditions and the recovery conditions after deformation of the auxiliary mud scraping wing and the main mud scraping wing are different, and the adaptability of the rubber plug to different underground working conditions is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum downhole tools, in particular to a composite rubber plug scraping mud structure. Background Art

[0002] During downhole oil well operations, cement slurry injection is required. Workers use surface pump pressure to inject a rubber plug into the casing. The rubber plug is a roughly cylindrical structure with several scraper wings arranged along its axial direction. These scraper wings allow the plug to scrape the mud from the casing wall once it is injected. Finally, surface workers determine whether the cement slurry has been injected by observing changes in pump pressure. However, in actual operation, downhole operating conditions vary due to external factors such as the geological environment and operating conditions. Existing rubber plug scraper wings maintain a consistent shape, resulting in poor adaptability to different downhole operating conditions. Utility Model Content

[0003] In view of the technical problems of the prior art, the utility model provides a composite rubber plug scraping mud structure.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A composite rubber plug scraper structure comprises: a rubber plug body and scraper wings; the scraper wings are connected to the rubber plug body; the scraper wings surround the rubber plug body; the scraper wings include main scraper wings and auxiliary scraper wings; the auxiliary scraper wings and the main scraper wings are arranged in sequence along the movement direction of the rubber plug body; the pressure bearing capacity of the auxiliary scraper wings is less than that of the main scraper wings.

[0006] In actual application, after the plug is injected into the casing, the plug will move relative to the casing, thereby using the scraper wings to scrape off the cement slurry adhering to the inner wall of the casing. Because the auxiliary scraper wings and the main scraper wings are arranged sequentially along the movement direction of the plug body, the main scraper wings first come into contact with the cement slurry, followed by the auxiliary scraper wings. In other words, the main scraper wings are the main part for scraping off the cement slurry, and the auxiliary scraper wings play an auxiliary role. At the same time, the pressure-bearing capacity of the auxiliary scraper wings is less than that of the main scraper wings. This causes the auxiliary scraper wings to be more easily deformed than the main scraper wings under the reaction force of the pump pressure and the cement slurry, and to recover more slowly after deformation. Combining the arrangement relationship of the two aforementioned, the adaptability of the plug to different downhole working conditions is enhanced.

[0007] Furthermore, the main scraper wing includes a main scraper portion and a main connecting portion; one end of the main connecting portion is connected to the rubber plug body, and the other end is connected to the main scraper portion.

[0008] Furthermore, the cross section of the main scraping portion is quadrilateral; the cross section area of ​​the main scraping portion is smaller than the cross section area of ​​the main connecting portion.

[0009] Furthermore, the angle α1 between the main scraping portion and the moving direction of the rubber plug body is an acute angle; the angle β1 between the main connecting portion and the moving direction of the rubber plug body is an acute angle; and α1 and β1 are equal.

[0010] Furthermore, the auxiliary scraping wing includes an auxiliary scraping portion and an auxiliary connecting portion; one end of the auxiliary connecting portion is connected to the rubber plug body, and the other end is connected to the auxiliary scraping portion.

[0011] Furthermore, the cross-section of the auxiliary mud scraping portion is oval; the cross-sectional area of ​​the auxiliary mud scraping portion is larger than the cross-sectional area of ​​the auxiliary connecting portion.

[0012] Furthermore, the angle α2 between the auxiliary scraping portion and the moving direction of the rubber plug body is an acute angle; the angle β2 between the auxiliary connecting portion and the moving direction of the rubber plug body is an acute angle; and α2 is smaller than β2. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Overall structure diagram.

[0014] Figure 2 : Enlarged view of the main scraper wing.

[0015] Figure 3 : Enlarged view of the auxiliary scraper wing.

[0016] Figure 4 : Schematic diagram of the main scraper wing angle.

[0017] Figure 5 : Schematic diagram of the angle of the auxiliary scraper wing.

[0018] Figure 6 : Overall comparison chart.

[0019] In the figure: 1, rubber plug body; 2, scraper wing; 21, main scraper wing; 22, auxiliary scraper wing; 211, main scraper part; 212, main connecting part; 221, auxiliary scraper part; 222, auxiliary connecting part. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] A composite rubber plug scraper structure comprises a rubber plug body 1 and a scraper wing 2. The rubber plug body 1 is a nearly cylindrical structure, one end of which is spherical and the other end is provided with a threaded interface for connecting with a floating collar impact seat.

[0022] The scraper wing 2 is connected to the plug body 1, and the scraper wing 2 surrounds the plug body 1. Specifically, the scraper wing 2 includes a main scraper wing 21 and an auxiliary scraper wing 22. The auxiliary scraper wing 22 and the main scraper wing 21 are arranged in sequence along the movement direction of the plug body 1. That is, during the movement of the plug body 1, the main scraper wing 21 first comes into contact with the cement slurry. Among them, the main scraper wing 21 includes a main scraper part 211 and a main connecting part 212. One end of the main connecting part 212 is connected to the plug body 1, and the other end is connected to the main scraper part 211. The cross-section of the main scraper part 211 is a quadrilateral, and the cross-sectional area of ​​the main scraper part 211 is smaller than the cross-sectional area of ​​the main connecting part 212. Specifically, the cross-sectional areas of the main scraper part 211 and the main connecting part 212 gradually increase from the main scraper part 211 to the plug body 1. At the same time, as shown in the accompanying drawings, the angle α1 between the main scraping portion 211 and the direction of movement of the plug body 1 is acute, and the angle β1 between the main connecting portion 212 and the direction of movement of the plug body 1 is acute, with α1 and β1 being equal. Therefore, based on the aforementioned configuration, the main scraping wings 21 have a sufficiently strong pressure-bearing capacity and are not easily deformed under high pump pressure. Furthermore, when the main scraping wings 21 are scraping slurry, the slurry will also exert a reverse force on the main scraping wings 21. Based on the aforementioned configuration, the force applied to the main scraping wings 21 is relatively uniform.

[0023] The auxiliary scraper wing 22 includes an auxiliary scraper portion 221 and an auxiliary connecting portion 222. One end of the auxiliary connecting portion 222 is connected to the plug body 1, and the other end is connected to the auxiliary scraper portion 221. The cross-section of the auxiliary scraper portion 221 is oval, and the cross-sectional area of ​​the auxiliary scraper portion 221 is larger than the cross-sectional area of ​​the auxiliary connecting portion 222. Specifically, the cross-sectional areas of the auxiliary scraper portion 221 and the auxiliary connecting portion 222 gradually decrease from the auxiliary scraper portion 221 to the plug body 1. At the same time, as shown in the accompanying drawings, the angle α2 between the auxiliary scraper portion 221 and the direction of movement of the plug body 1 is an acute angle, and the angle β2 between the auxiliary connecting portion 222 and the direction of movement of the plug body 1 is an acute angle. α2 is smaller than β2. Therefore, based on the aforementioned configuration, the auxiliary scraper wings 22 have a lower pressure-bearing capacity than the main scraper wings 21. Compared to the main scraper wings 21, they are more likely to deform under high pump pressure and, after deformation, recover more slowly than the main scraper wings 21. During the slurry scraping process, the main scraper wings 21 first remove most of the slurry, but a small amount of slurry may still adhere to the casing wall, which is then scraped away by the auxiliary scraper wings 22.

[0024] In actual application, there are four groups of scraper wings 2, namely two groups of main scraper wings 21 and two groups of auxiliary scraper wings 22. After the plug body 1 is connected to the floating collar impact seat through a threaded interface, the plug body 1 is driven to move relative to the casing. According to the aforementioned arrangement relationship and the structural configuration of the two, most of the cement slurry is first scraped off by the main scraper wings 21, and then the auxiliary scraper wings 22 assist in scraping off the remaining cement slurry. Four groups of scraper wings 2 are used to scrape four times in succession, thereby scraping off the cement slurry to the maximum extent, avoiding hidden dangers such as cement slurry leakage. At the same time, the main scraper wings 21 and the auxiliary scraper wings 22 have different pressure-bearing capacities, and combined with the aforementioned arrangement sequence, the adaptability to different downhole working conditions is effectively enhanced.

[0025] As a preferred embodiment, see the attached Figure 6 The main scraper portion 211 near the spherical end of the plug body 1 is called the main scraper portion A, and the other is called the main scraper portion B. Specifically, the outer edge of the main scraper portion B is closer to the plug body 1 than the main scraper portion A. That is, a gap is provided in the horizontal direction between the outer edge of the main scraper portion B and the outer edge of the main scraper portion A. The auxiliary scraper portion 221 near the spherical end of the plug body 1 is called the auxiliary scraper portion A, and the other is called the auxiliary scraper portion B. Specifically, the outer edge of the auxiliary scraper portion A is closer to the plug body 1 than the main scraper portion B. That is, a gap is provided in the horizontal direction between the outer edge of the auxiliary scraper portion A and the outer edge of the main scraper portion B. The outer edges of the auxiliary scraper portion B and the auxiliary scraper portion A are flush. At the same time, the cross-sectional area of ​​the auxiliary scraper portion B is smaller than that of the auxiliary scraper portion A. Therefore, through the above-mentioned special configuration, the adaptability to different downhole working conditions is further enhanced.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A composite rubber plug scraper structure, characterized by: include: Rubber plug body (1), mud scraping wing (2); The scraper wing (2) is connected to the rubber plug body (1); The scraping wings (2) surround the rubber plug body (1); The scraping wing (2) comprises a main scraping wing (21) and an auxiliary scraping wing (22); The auxiliary scraping wings (22) and the main scraping wings (21) are arranged in sequence along the movement direction of the rubber plug body (1); The main scraping wing (21) comprises a main scraping portion (211) and a main connecting portion (212); The cross section of the main scraping portion (211) is quadrilateral; The cross-sectional area of ​​the main scraping portion (211) is smaller than the cross-sectional area of ​​the main connecting portion (212); The auxiliary mud scraping wing (22) comprises an auxiliary mud scraping portion (221) and an auxiliary connecting portion (222); The auxiliary scraping portion (221) has an oval cross-section; The cross-sectional area of ​​the auxiliary mud scraping portion (221) is greater than the cross-sectional area of ​​the auxiliary connecting portion (222); The pressure bearing capacity of the auxiliary scraping wing (22) is thereby made smaller than the pressure bearing capacity of the main scraping wing (21).

2. The composite rubber plug scraper structure according to claim 1, characterized in that: One end of the main connecting portion (212) is connected to the rubber plug body (1), and the other end is connected to the main scraping portion (211).

3. The composite rubber plug scraper structure according to claim 2, characterized in that: The included angle α1 between the main scraping portion (211) and the movement direction of the rubber plug body (1) is an acute angle; The included angle β1 between the main connecting portion (212) and the movement direction of the plug body (1) is an acute angle; The α1 is equal to the β1.

4. The composite rubber plug scraper structure according to claim 1, characterized in that: One end of the auxiliary connecting portion (222) is connected to the rubber plug body (1), and the other end is connected to the auxiliary mud scraping portion (221).

5. The composite rubber plug scraper structure according to claim 4, characterized in that: The included angle α2 between the auxiliary scraping portion (221) and the movement direction of the rubber plug body (1) is an acute angle; The included angle β2 between the auxiliary connecting portion (222) and the movement direction of the plug body (1) is an acute angle; The α2 is smaller than the β2.

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