Anti-skid well cementation rubber plug

Abstract

The utility model discloses an anti-skidding well cementation rubber plug which comprises a rubber plug core shaft, a plurality of rubber discs are axially sleeved on the rubber plug core shaft, protruding structures are arranged on the outer side walls of the rubber discs, and the protruding structures are used for resisting pressure at two axial ends of the rubber discs. And a limiting piece is arranged at the end part of the rubber plug mandrel. The protruding structures are used for resisting pressure at the two axial ends of the rubber disc, can bear bidirectional pressure from cement paste and displacing liquid during well cementation operation, achieve good sealing of the rubber plug, prevent layer channeling and avoid the backflow phenomenon, can scrape residual cement paste on the wall of a casing pipe, ensure that no cement is left in the casing pipe, and improve the well cementation quality. When a cement plug is arranged in a pipe, the protruding structures can be embedded into cement, after the cement is solidified, the anti-skid well cementation rubber plug and the cement are solidified into a whole, and therefore the anti-skid well cementation rubber plug can be prevented from rotating along with a drill bit in the plug drilling process, and the anti-skid well cementation rubber plug can be easily drilled away.

Description

Technical Field

[0001] The utility model belongs to the technical field of cementing operation, and relates to an anti-slip cementing plug. Background Art

[0002] After cement is injected in the cementing operation, a cementing plug is pressed into the wellbore by displacement pressure, and finally all the cement slurry is displaced into the annular space between the casing and the well wall. The cementing plug descends to the supporting bumping seat, the pressure suddenly increases, the displacement stops, and the bumping is completed. However, conventional cementing plugs have many drawbacks.

[0003] The rubber wing of the cup or rubber disc of the conventional plug is a unidirectional structure and usually can only withstand the unidirectional pressure from the displacement fluid in the wellbore. Once the cement slurry column pressure in the annulus of the well wall is too high, the plug cannot withstand the reverse pressure, resulting in backflow. At this time, cement will remain in the casing, increasing the difficulty of the later drilling operation. Seriously, there will be too much cement in the casing, resulting in cementing failure and abandonment of the whole well.

[0004] After the cement injection operation starts, with the increase of the construction time, the wear of the cup or rubber disc of the conventional plug will become larger and larger, and the fit with the wellbore will become worse and worse. It is easy to have poor sealing, causing interlayer flow between the cement slurry and the displacement fluid, thus affecting the displacement efficiency, reducing the cementing quality, and bringing difficulties to the later operation. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problems in the prior art that the rubber wing of the cup or rubber disc of the conventional plug is a unidirectional structure, which can only withstand the unidirectional pressure from the displacement fluid in the wellbore. When the internal pressure is too high, backflow will occur, resulting in cementing failure. At the same time, poor sealing is likely to occur inside, causing interlayer flow between the cement slurry and the displacement fluid, thus affecting the displacement efficiency, and to provide an anti-slip cementing plug.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An anti-slip cementing plug includes a plug core shaft, and a plurality of rubber discs are axially sleeved on the plug core shaft. A convex structure is arranged on the outer side wall of the rubber disc, and the convex structure is used to resist the pressure at both axial ends of the rubber disc;

[0008] A limiting member is arranged at the end of the plug core shaft.

[0009] A further improvement of the utility model lies in:

[0010] The convex structure includes a first convex portion and a second convex portion. The first convex portion is inclined on one side in the axial direction of the rubber disc, and the second convex portion is inclined to the other side.

[0011] The first convex portion and the second convex portion are of an integral structure.

[0012] A rubber disk fixing seat is arranged between every two adjacent rubber disks.

[0013] A groove is formed on the end surface of the rubber disk fixing seat close to the rubber disk, and a protrusion corresponding to the groove is arranged on the end surface of the rubber disk.

[0014] A snap ring is arranged between the rubber disk fixing seat and the rubber plug mandrel.

[0015] The limiting member is a rubber plug head, and the rubber plug head is used for axially positioning the rubber disk.

[0016] A clamping groove is formed on the end surface of the rubber plug head close to the rubber disk, and the clamping groove is clamped with the rubber disk.

[0017] Four rubber disks are axially arranged.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model discloses an anti-slip cementing rubber plug. The rubber plug disclosed by the utility model is provided with a protrusion structure on the outer end surface. The protrusion structure is used for resisting the pressure at both axial ends of the rubber disk. During the cementing operation, the rubber plug can bear the bidirectional pressure from the cement slurry and the displacement fluid, realize the good sealing of the rubber plug, prevent cross-strata, avoid the backflow phenomenon. The protrusion structure can scrape the residual cement slurry on the casing wall, ensure that there is no cement left in the casing, improve the cementing quality, ensure the smooth progress of the subsequent work. When there is a cement plug in the pipe, the protrusion structure will also be embedded in the cement. After the cement solidifies, the anti-slip cementing rubber plug will be integrated with the cement, which can prevent the anti-slip cementing rubber plug from rotating with the drill bit during the drill plug process, so that the anti-slip cementing rubber plug can be easily drilled out.

[0020] Further, in the utility model, one side of the first protrusion part inclines along the axial direction of the rubber disk, and the second protrusion part inclines to the other side, which improves the effectiveness of the rubber plug in resisting the bidirectional pressure.

[0021] Further, in the utility model, a rubber disk fixing seat is arranged between every two adjacent rubber disks, which ensures the stability of the rubber plug fixation.

[0022] Further, in the utility model, a concave surface is formed on the end surface of the rubber disk fixing seat close to the rubber disk, and a protrusion corresponding to the concave surface is arranged on the end surface of the rubber disk, which can still improve the stability of the rubber plug fixation under the action of the internal pressure.

[0023] Further, in the utility model, a clamping groove is formed on the end surface of the rubber plug head close to the rubber disk, and the clamping groove is clamped with the rubber plug head, which avoids the axial movement of the rubber disk. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0025] Figure 1 It is the overall structure diagram of the present utility model;

[0026] Wherein: 1 - rubber plug mandrel; 2 - rubber disk; 3 - snap ring; 4 - rubber disk fixing seat; 5 - rubber plug head; 6 - first convex part; 7 - second convex part. Specific embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0029] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model. In addition, terms such as "first" and "second" are only used for differential description and cannot be understood as indicating or implying relative importance.

[0031] In addition, when the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0032] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, when the terms "arranged", "installed", "connected", and "joined" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] The following further describes the present invention in detail with reference to the drawings:

[0034] See Figure 1 , the embodiments of the present invention disclose an anti-slip cementing plug. A raised structure is arranged on the plug to achieve good sealing of the plug, prevent cross-strata; scrape the residual cement slurry on the casing wall to ensure that there is no cement left in the casing; improve the cementing quality and ensure the smooth progress of the subsequent cement plug drilling operation.

[0035] Specifically, it includes the following structures:

[0036] Embodiment 1

[0037] The embodiments of the present invention disclose an anti-slip cementing plug, including a plug core shaft 1. A plurality of plug discs 2 are axially sleeved on the plug core shaft 1. A raised structure is arranged on the outer end face of the plug disc 2. The raised structure is used to resist the pressure at both axial ends of the plug disc 2; a limiting member is arranged at the end of the plug core shaft 1.

[0038] In this embodiment, a raised structure is arranged on the outer end face of the disclosed plug. The raised structure is used to resist the pressure at both axial ends of the plug disc. During the cementing operation, it can withstand the bidirectional pressure from the cement slurry and the displacement fluid, achieve good sealing of the plug, prevent cross-strata. The raised structure can scrape the residual cement slurry on the casing wall to ensure that there is no cement left in the casing, improve the cementing quality, and ensure the smooth progress of the subsequent work. When there is a cement plug in the pipe, the raised structure will also embed into the cement. After the cement solidifies, the anti-slip cementing plug will coagulate with the cement into one body. This can prevent the anti-slip cementing plug from rotating with the drill bit during the plug drilling process, so that the anti-slip cementing plug can be easily drilled out.

[0039] Embodiment 2

[0040] An embodiment of the utility model discloses an anti-slip cementing plug, which includes a plug mandrel 1. A plurality of rubber discs 2 are axially sleeved on the plug mandrel 1. A raised structure is arranged on the outer end surface of the rubber disc 2, and the raised structure is used to resist the pressure at both axial ends of the rubber disc 2; a limiting member is arranged at the end of the plug mandrel 1. The raised structure includes a first raised portion 6 and a second raised portion 7. The first raised portion 6 is inclined on one side along the axial direction of the rubber disc 2, and the second raised portion 7 is inclined to the other side.

[0041] In this embodiment, a V-shaped structure is formed at the connection of the first raised portion 6 and the second raised portion 7. The ends of the first raised portion 6 and the second raised portion 7 are both in contact with the inner side wall of the well pipe, playing a good sealing role and effectively preventing cross-layer.

[0042] Among them, the first raised portion 6 is inclined on one side along the axial direction of the rubber disc 2, and the second raised portion 7 is inclined to the other side. The two raised portions are inclined in opposite directions, and can withstand the bidirectional pressure of the rubber disc 2, and will not cause the failure of cementing.

[0043] Embodiment 3

[0044] An embodiment of the utility model discloses an anti-slip cementing plug, which includes a plug mandrel 1. A plurality of rubber discs 2 are axially sleeved on the plug mandrel 1. A raised structure is arranged on the outer end surface of the rubber disc 2, and the raised structure is used to resist the pressure at both axial ends of the rubber disc 2; a limiting member is arranged at the end of the plug mandrel 1. The raised structure includes a first raised portion 6 and a second raised portion 7. The first raised portion 6 is inclined on one side along the axial direction of the rubber disc 2, and the second raised portion 7 is inclined to the other side. The first raised portion 6 and the second raised portion 7 are of an integral structure.

[0045] Embodiment 4

[0046] An embodiment of the utility model discloses an anti-slip cementing plug, which includes a plug mandrel 1. A plurality of rubber discs 2 are axially sleeved on the plug mandrel 1. A raised structure is arranged on the outer end surface of the rubber disc 2, and the raised structure is used to resist the pressure at both axial ends of the rubber disc 2; a limiting member is arranged at the end of the plug mandrel 1. A rubber disc fixing seat 4 is arranged between every two adjacent rubber discs 2.

[0047] In this embodiment, the fixing seat 4 is installed at the end of the rubber disc 2 and is in contact with the rubber disc 2 to ensure the stability of the installation of each rubber disc 2.

[0048] Embodiment 5

[0049] The embodiment of the utility model discloses an anti-skid cementing rubber plug, comprising a rubber plug core shaft 1, on which a plurality of rubber discs 2 are axially sleeved, and a protrusion structure is arranged on the outer end surface of the rubber disc 2, and the protrusion structure is used to resist the pressure at both ends of the axial direction of the rubber disc 2; and a stopper is arranged at the end of the rubber plug core shaft 1. A rubber disc fixing seat 4 is arranged between each two adjacent rubber discs 2. A concave surface is provided on the end surface of the rubber disc fixing seat 4 close to the rubber disc 2, and a protrusion corresponding to the concave surface is arranged on the end surface of the rubber disc 2.

[0050] In this embodiment, the concave surface at the end of the fixing seat 4 can be clamped with the protrusion on the end surface of the rubber disc 2, so that the protrusion on the end surface of the rubber disc 2 is embedded in the concave surface, thereby improving the fixing effect of the fixing seat.

[0051] Example 6

[0052] The embodiment of the utility model discloses an anti-skid cementing rubber plug, comprising a rubber plug core shaft 1, on which a plurality of rubber discs 2 are axially sleeved, and a convex structure is arranged on the outer end surface of the rubber disc 2, and the convex structure is used to resist the pressure at both ends of the axial direction of the rubber disc 2; a stopper is arranged at the end of the rubber plug core shaft 1. A retaining spring 3 is arranged between the rubber disc fixing seat 4 and the rubber plug core shaft 1.

[0053] Example 7

[0054] The embodiment of the utility model discloses an anti-skid cementing rubber plug, comprising a rubber plug core shaft 1, on which a plurality of rubber discs 2 are axially sleeved, and a protrusion structure is arranged on the outer end surface of the rubber disc 2, and the protrusion structure is used to resist the pressure at both ends of the rubber disc 2 in the axial direction; and a stopper is arranged at the end of the rubber plug core shaft 1. The stopper is a rubber plug head 5, and the rubber plug head 5 is used to axially position the rubber disc 2.

[0055] Furthermore, the rubber plug head 5 abuts against the ends of all the rubber discs 2. When the rubber plug 5 as a whole runs in the tube, it can abut against the rubber disc 2 to ensure that the rubber disc 2 is closely attached to the tube wall in both directions, thus playing a good sealing role and effectively preventing layer channeling.

[0056] Example 8

[0057] The embodiment of the utility model discloses an anti-skid cementing rubber plug, comprising a rubber plug core shaft 1, on which a plurality of rubber discs 2 are axially sleeved, and a protrusion structure is arranged on the outer end surface of the rubber disc 2, and the protrusion structure is used to resist the pressure at both ends of the axial direction of the rubber disc 2; a limiter is arranged at the end of the rubber plug core shaft 1. The limiter is a rubber plug head 5, and the rubber plug head 5 is used to axially position the rubber disc 2. A card slot is provided on the end surface of the rubber plug head 5 close to the rubber disc 2, and the card slot is clamped with the rubber plug head 5. A card slot is provided on the end surface of the rubber plug head 5 close to the rubber disc 2, and the card slot is clamped with the rubber disc 2.

[0058] In this embodiment, the end of the rubber disk 2 corresponds to the card slot, so that the end of the rubber disk 2 can be embedded inside the card slot of the rubber plug head 5, improving the axial fixing effect.

[0059] A non-slip cementing rubber plug disclosed in this embodiment. The rubber disk 2 with a convex structure can withstand the bidirectional pressure from the cement slurry and the displacement fluid during the cementing operation, and the rubber disk 2 has good wear resistance. During the downward movement in the casing, the bidirectional action can completely scrape off the residual cement slurry on the casing wall.

[0060] At the same time, when there is a cement plug in the pipe, the anti-slip protrusions of the rubber disk 2 will also be embedded in the cement. After the cement solidifies, the non-slip cementing rubber plug will be integrated with the cement. This can prevent the non-slip cementing rubber plug from rotating with the drill bit during the drill plug process, so that the non-slip cementing rubber plug can be easily drilled out.

[0061] The device disclosed in the embodiment of the present invention has a simple structure, is easy to use, has strong applicability, realizes good sealing of the rubber plug, prevents cross-layer leakage; scrapes the residual cement slurry on the casing wall to ensure that there is no cement left in the casing; improves the cementing quality and ensures the smooth progress of the subsequent drill plug work.

[0062] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-slip cementing plug, characterized in that, It includes a rubber stopper mandrel (1), and a number of rubber disks (2) are axially sleeved on the rubber stopper mandrel (1). A convex structure is provided on the outer side wall of the rubber disk (2), and the convex structure is used to resist the pressure at both axial ends of the rubber disk (2); A limiting member is provided at the end of the rubber stopper mandrel (1); The convex structure includes a first convex portion (6) and a second convex portion (7). The first convex portion (6) is inclined on one side in the axial direction of the rubber disk (2), and the second convex portion (7) is inclined to the other side.

2. The anti-slip cementing plug according to claim 1, wherein, The first convex portion (6) and the second convex portion (7) are of an integral structure.

3. The anti-slip cementing plug according to claim 1, characterized in that, A rubber disk fixing seat (4) is provided between every two adjacent rubber disks (2).

4. The anti-slip cementing plug according to claim 3, wherein A groove is formed on the end face of the rubber disk fixing seat (4) close to the rubber disk (2), and a convex corresponding to the groove is provided on the end face of the rubber disk (2).

5. The anti-slip cementing plug according to claim 3, wherein A snap ring (3) is provided between the rubber disk fixing seat (4) and the rubber stopper mandrel (1).

6. The anti-slip cementing plug according to claim 1, characterized in that, The limiting member is a rubber stopper head (5), and the rubber stopper head (5) is used for axially positioning the rubber disk (2).

7. The anti-slip cementing plug according to claim 6, characterized in that, A card slot is formed on the end face of the rubber stopper head (5) close to the rubber disk (2), and the card slot is clamped with the rubber disk (2).

8. A non-slip cementing plug according to claim 1, wherein, Four rubber disks (2) are axially arranged.

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