Tubing plug device

Abstract

The oil pipe blocking device provided by the embodiment of the present disclosure comprises a cylinder, a support and a sealing ball. One end of the cylinder is connected with the support, the other end of the cylinder is used for being connected with an oil pipe, and the support is located at the end of the cylinder which is away from the wellhead of the oil well. A ball seat is arranged in the cylinder, the sealing ball is located in the cylinder and between the ball seat and the support, a through hole is arranged on the ball seat, and the support provides elastic support for the sealing ball, so that the sealing ball is pressed between the support and the ball seat and seals the through hole. In the process of lowering the oil pipe into the oil well, the well killing fluid in the oil well cannot enter the inside of the oil pipe due to the blocking effect of the sealing ball, and the well killing fluid is effectively prevented from being sprayed out of the oil pipe. When the oil pipe is pressurized, the sealing ball can be separated from the ball seat due to the elastic support provided by the support for the sealing ball, so that the oil pipe blocking device is in a conductive state, thereby facilitating the backwashing operation of the oil well.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas field development, and in particular to a pipeline plugging device. Background Technology

[0002] During oil and gas field development operations, to ensure well control, the kill fluid level in the well must be maintained at the wellhead. When tubing is run into the well, as the tubing gradually penetrates deeper, kill fluid of the same volume as the tubing will return from the well. If the tubing speed is too high or a large-diameter tool is attached to the bottom of the tubing, not all the kill fluid returning from the well can be discharged from the casing in time. Some of the kill fluid will spray out from inside the tubing, causing serious pollution to the construction site.

[0003] The relevant technologies employ the following two methods to prevent kill fluid from spraying out of the tubing. Method 1: A stopcock valve is installed on the upper part of the tubing to be run into the well. After the tubing is seated on the blowout preventer (BOP), the stopcock valve is removed and installed on the upper part of the next tubing section. This process is repeated cyclically to gradually lower the tubing into the well. Method 2: A check valve is installed inside the tubing downhole to prevent kill fluid from spraying out of the tubing.

[0004] However, in the process of disassembling and installing the plug valve, some kill fluid will still spray out from the top of the tubing in the first method, which cannot completely solve the pollution problem caused by the kill fluid. Moreover, disassembling and installing the plug valve increases the workload and seriously affects production efficiency. Although the second method can solve the problem of kill fluid overflow, the one-way valve inside the tubing will block the tubing in one direction, making it impossible to perform backwashing during well development. Summary of the Invention

[0005] Therefore, this disclosure provides a tubing plugging device that can prevent kill fluid from spraying out of the tubing without affecting backwashing of the well. The technical solution is as follows:

[0006] On the one hand, this disclosure provides an oil pipe plugging device, including a cylinder, a support member, and a sealing ball;

[0007] One end of the cylinder is connected to the support member, and the other end of the cylinder is used to connect to the oil pipe. The support member is located at the end of the cylinder away from the wellhead of the oil well.

[0008] A ball seat is provided inside the cylinder, and the sealing ball is located inside the cylinder and between the ball seat and the support member. The ball seat is provided with a through hole. The support member provides elastic support for the sealing ball, thereby squeezing the sealing ball between the support member and the ball seat and sealing the through hole.

[0009] In one possible implementation, the support includes an elastic element and a ball cup, one end of the elastic element being connected to the ball cup, and the other end of the elastic element elastically supporting the sealing ball.

[0010] In one possible implementation, the elastic element includes at least two elastic rods, each of which has a bend that is close to each other at its midpoint, the sealing ball is located between the two elastic rods, and the bend is configured to support the sealing ball.

[0011] In one possible implementation, there are three elastic rods, and the distance between any two of the three elastic rods and the connection point with the support is equal.

[0012] In one possible implementation, the support member further includes a short circuit connected to one end of the cylinder.

[0013] The ball cup, the elastic element, and the sealing ball are located between the short circuit and the ball seat. One end of the ball cup is connected to the short circuit, and the other end of the ball cup is connected to the end of each elastic rod away from the ball seat.

[0014] In one possible implementation, the cup has a rim facing the sealing ball, and the diameter of the rim is larger than the diameter of the sealing ball.

[0015] In one possible implementation, the support further includes a base connected to the end of the short circuit near the ball seat, and a boss is provided on the side of the base near the ball seat, the boss being detachably connected to the side of the cup away from the sealing ball.

[0016] In one possible implementation, the short connector is cylindrical, and the sidewall of the base is threadedly connected to the inner wall of the short connector.

[0017] In one possible implementation, the base is provided with a hollow structure that connects the cylinder to the short circuit.

[0018] In one possible implementation, the wall of the through hole near the sealing ball is provided with a chamfered structure, and the sealing ball abuts against the chamfered structure.

[0019] In one possible implementation, the ball seat has a slope on the side away from the sealing ball, the slope surrounds the through hole, and the slope is inclined toward the through hole.

[0020] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0021] In the tubing plugging device provided in this embodiment, one end of the cylinder is used to connect to the tubing. The support member elastically compresses the sealing ball, causing it to block the through-hole on the ball seat. The sealing ball is located on the side of the ball seat away from the wellhead. The support member and the sealing ball achieve unidirectional plugging of the through-hole on the ball seat. During the process of running the tubing into the well, the sealing ball prevents kill fluid from entering the tubing, effectively preventing it from spraying out and solving the pollution problem caused by the kill fluid. Furthermore, when the tubing is pressurized, the support member provides elastic support for the sealing ball, allowing it to separate from the ball seat and no longer block the through-hole on the ball seat. This keeps the tubing plugging device in a conductive state, facilitating backwashing operations on the well. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of an oil pipe plugging device provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of the structure of a tubing plugging device provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of the structure of a tubing plugging device provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of another oil pipe plugging device provided in an embodiment of this disclosure.

[0027] The reference numerals in the figure represent:

[0028] 1-Cylinder body;

[0029] 11-Spherical seat;

[0030] 12-Through hole;

[0031] 13-Slope;

[0032] 2-Supporting components;

[0033] 21-Ball Cup;

[0034] 211 - Cup rim;

[0035] 212 - Threaded hole;

[0036] 213 - First connecting hole;

[0037] 22-Short circuit;

[0038] 23-Base;

[0039] 24-pin;

[0040] 231 - Boss;

[0041] 232 - Hollowed-out structure;

[0042] 20 - Elastic element;

[0043] 201-Elastic rod;

[0044] 202 - Bending section;

[0045] 3-Sliding component;

[0046] 31-Receiving hole;

[0047] 32 - Second connecting hole;

[0048] 4-Sealed ball. Detailed Implementation

[0049] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0050] During oil and gas field development operations, the kill fluid level in an oil well is generally located at the wellhead. When tubing is run into the well, because the tubing occupies part of the space inside the well, kill fluid of equal volume to the tubing will return from the well. Normally, this kill fluid is discharged through the casing. However, if the tubing is run down too quickly or if a large-diameter tool is installed at the bottom of the tubing, the casing may not be able to discharge all the kill fluid, and some of the kill fluid will spray out from inside the tubing. This sprayed kill fluid can cause serious pollution to the construction site.

[0051] Related technologies employ plug valves or check valves to prevent kill fluid from escaping from the tubing. The plug valve is installed at the top of the tubing before it's run into the well. Once the tubing is seated on the blowout preventer (BOP), the plug valve is removed and installed at the top of the next tubing. However, during the removal and installation of the plug valve, some kill fluid still escaping from the top of the tubing, failing to completely solve the contamination problem caused by the kill fluid. Furthermore, removing and installing the plug valve increases workload and severely impacts production efficiency. Alternatively, a check valve is installed inside the tubing to prevent kill fluid from escaping. However, this check valve can cause one-way blockage of the tubing, preventing backwashing during well development. Backwashing involves injecting high-speed air or water into the well, causing sand, mud, and other deposits to be resuspended in the well fluid and flushed upwards, thus removing residual impurities and debris. Therefore, this disclosure provides a tubing plugging device that can prevent kill fluid from spraying out of the tubing without affecting the backwashing of the well.

[0052] Figure 1 This is a schematic diagram of the overall structure of an oil pipe plugging device provided in an embodiment of this disclosure. Figure 1 As shown, the tubing plugging device includes a cylinder 1, a support member 2, and a sealing ball 4. One end of the cylinder 1 is connected to the support member 2, and the other end of the cylinder 1 is used to connect to the tubing. The support member 2 is located at the end of the cylinder 1 furthest from the wellhead. A ball seat 11 is provided inside the cylinder 1, and the sealing ball 4 is located inside the cylinder 1, between the ball seat 11 and the support member 2. The ball seat 11 is provided with a through hole 12. The support member 2 provides elastic support for the sealing ball 4, thereby squeezing the sealing ball 4 between the support member 2 and the ball seat 11, and sealing the through hole 12 with the sealing ball 4.

[0053] In the tubing plugging device provided in this embodiment, one end of the cylinder 1 is used to connect to the tubing. Because the support member 2 elastically compresses the sealing ball 4, the sealing ball 4 seals the through hole 12 on the ball seat 11. The sealing ball 4 is located on the side of the ball seat 11 away from the wellhead. The support member 2 and the sealing ball 4 achieve one-way plugging of the through hole 12 on the ball seat 11. During the process of running the tubing into the well, due to the plugging effect of the sealing ball 4, the kill fluid in the well will not enter the tubing, effectively preventing the kill fluid from spraying out of the tubing and solving the pollution problem caused by the kill fluid. Moreover, when the tubing is pressurized, because the support member 2 provides elastic support for the sealing ball 4, the support member 2 can deform to separate the sealing ball 4 from the ball seat 11, thereby no longer blocking the through hole 12 on the ball seat 11, keeping the tubing plugging device in a conductive state to facilitate backwashing operations on the well.

[0054] To make the technical solutions and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0055] See Figure 1 The tubing plugging device provided in this embodiment includes a cylinder 1, a support 2, and a sealing ball 4. One end of the cylinder 1 is connected to the support 2, and the other end of the cylinder 1 is connected to the tubing. For example, the other end of the cylinder 1 is provided with an internal thread, thereby connecting the cylinder 1 and the tubing via a thread. When the tubing is lowered into the well, the cylinder 1 is located at the bottom end of the tubing, and the support 2 is located at the end of the cylinder 1 furthest from the wellhead. A ball seat 11 is provided inside the cylinder 1, and a through hole 12 is provided on the ball seat 11. The through hole 12 connects the opposite ends of the sleeve 1. The diameter of the through hole 12 is smaller than the inner diameter of other parts of the cylinder 11, and the axis of the through hole 12 coincides with the axis of the cylinder 1. The sealing ball 4 is located between the lower surface of the ball seat 11 and the support 2 inside the cylinder 1. The diameter of the sealing ball 4 is larger than the diameter of the through hole 12, and the support 2 is used to elastically support the sealing ball 4. Furthermore, the support member 2 is configured to press the sealing ball 4 towards the ball seat 11, causing the sealing ball 4 to block the through hole 12. After the operation of running tubing into the oil well is completed, and when there is no need for the tubing sealing device to block the tubing, the tubing equipped with the tubing sealing device can be pressurized. The pressure will act on the sealing ball 4, causing the sealing ball 4 to compress the support member 2 and undergo elastic deformation, thereby causing the sealing ball 4 to separate from the ball seat 11. The sealing ball 4 no longer blocks the through hole 12, and the tubing can communicate with other components connected to the lower part of the cylinder 1, thereby enabling backwashing operations on the oil well.

[0056] In some embodiments of this disclosure, such as Figure 1 As shown, the support member 2 includes an elastic member 20 and a ball cup 21. One end of the elastic member 20 is connected to the ball cup 21, and the other end of the elastic member 20 elastically supports the sealing ball 4. When the sealing ball 4 is subjected to pressure, the elastic member 20 can undergo elastic deformation, causing the sealing ball 4 to fall into the ball cup 21, thereby preventing the sealing ball 4 from blocking the through hole 12.

[0057] In one possible implementation, the support 2 further includes a short connector 22 connected to one end of the cylinder 1. The ball cup 21 is located directly below the sealing ball 4, thereby receiving the sealing ball 4 when the elastic member 20 deforms and the sealing ball 4 separates from the ball seat 11. One end of the short connector 22 is connected to the cylinder 1, and the short connector 22 is partially located inside and partially outside the cylinder 1. The end of the short connector 22 away from the cylinder 1 is used to connect to other components in the well, such as tubing.

[0058] In one possible implementation, see Figure 1The ball cup 21, the elastic element 20, and the sealing ball 4 are located between the shorting joint 22 and the ball seat 11. One end of the ball cup 21 is connected to the shorting joint 22, and the other end of the ball cup 21 is connected to the end of the elastic element 20 away from the ball seat 11. The ball cup 21 is cylindrical, and its axis coincides with the center of the sealing ball 4 and the axis of the through hole 12. The elastic element 20 is located between the ball cup 21 and the sealing ball 4, and is used to press the sealing ball 4 upward, thereby making the sealing ball 4 fit tightly against the end of the through hole 12.

[0059] See Figure 1 The short connector 22 is detachably connected to the end of the cylinder 1 furthest from the wellhead. For example, the outer wall of the short connector 22 has external threads, and the inner wall of the cylinder 1 has internal threads; the short connector 22 is threadedly connected to the cylinder 1. As the short connector 22 is screwed into the cylinder 1, the ball cup 21 moves towards the ball seat 11, causing the sealing ball 4 to contact the ball seat 11. As the short connector 22 continues to screw in, the elastic element 20 presses upwards against the sealing ball 4 and undergoes elastic deformation, thereby applying elastic force to the sealing ball 4, causing the sealing ball 4 to adhere tightly to the end face of the through hole 12.

[0060] Optionally, the wall of the through hole 12 near the sealing ball 4 is provided with a chamfered structure, and the sealing ball 4 abuts against the chamfered structure. This chamfered structure can increase the contact area between the sealing ball 4 and the wall of the through hole 12, which is beneficial to improving the sealing effect of the sealing ball 4 on the through hole 12.

[0061] In some embodiments of this disclosure, such as Figure 1 As shown, a slope 13 is provided on the side of the ball seat 11 away from the sealing ball 4. The slope 13 surrounds the through hole 12 and is inclined towards the through hole 12. When the tubing is pressure tested, a sealing ball can be dropped into the tubing. The sealing ball falls onto the slope 13 of the ball seat 11, thereby sealing the through hole 12 above the ball seat 11. That is, both the upper and lower sides of the ball seat 11 provided in this embodiment can be sealed by the ball, so that the tubing sealing device can both prevent the kill fluid from entering the tubing from the bottom and perform pressure testing on the tubing.

[0062] Figure 2 This is a schematic diagram of the structure of a tubing plugging device provided in an embodiment of this disclosure. In some embodiments of this disclosure, such as… Figure 2As shown, the elastic element 20 includes at least two elastic rods 201. The two elastic rods 201 each have a bend 202 located close to each other at their midpoints. The sealing ball 4 is located between the two elastic rods 201, and the bend 202 is configured to support the sealing ball 4. The elastic rods 201 can be made of carbon steel, spring steel, high-nickel alloy, etc. The elastic rods 201 can undergo elastic deformation at the bend 202, thereby changing the bending angle of the bend 202. Specifically, the midpoint of one elastic rod 201 bends towards the other elastic rod 201, forming the bend 202. The distance between the bends 202 of the two elastic rods 201 is less than the diameter of the sealing ball 4, to support the sealing ball 4. As the sealing ball 4 moves towards the cup 21, the bends 202 of the two elastic rods 201 undergo elastic deformation, thereby pressing the sealing ball 4 upwards. When pressure is applied to the oil pipe, the pressure will cause the sealing ball 4 to move further towards the ball cup 4. When the center of the sealing ball 4 is closer to the ball cup 21 than the position where the distance between the curved part 202 of the two elastic rods 201 is the smallest, the sealing ball 4 will separate from the elastic element 20 and fall into the ball cup 21, so that the part above and below the ball seat 11 of the cylinder 1 is connected through the through hole 12.

[0063] Preferably, see Figure 2 There are three elastic rods 201, and the distance between any two elastic rods 201 and the connection points of the support member 2 is equal. The ends of the three elastic rods 201 are respectively connected to the ends of the cup 21 near the ball seat 11, and the angle between the connection points of the three elastic rods 201 and the connection points of the cup 11 and the axis of the cup 11 is 120°. The three elastic rods 201 can provide stable support for the sealing ball 4 to prevent the sealing ball 4 from falling out of the cup 21.

[0064] In some embodiments of this disclosure, such as Figure 2 As shown, the ball cup 21 has a cup opening 211, which is located on the side near the sealing ball 4, and the diameter of the cup opening 211 is larger than the diameter of the sealing ball 4. The ball cup 21 has a cylindrical receiving space inside, allowing the sealing ball 4 to fall from the cup opening 211 into the receiving space within the ball cup 21, preventing the sealing ball 4 from detaching from the oil pipe sealing device and falling into other components within the oil pipe. After removing the oil pipe sealing device, the sealing ball 4 can be removed from the ball cup 21 and repositioned between the elastic member 20 and the ball seat 11 for reuse.

[0065] Optionally, such as Figure 2As shown, the support member 2 also includes a base 23, which is connected to the end of the short connector 22 near the ball seat 11. A boss 231 is provided on the side of the base 23 near the ball seat 11, and the boss 231 is detachably connected to the side of the ball cup 21 away from the sealing ball 4. The short connector 22 is cylindrical, and the outer diameter of the ball cup 21 is smaller than the inner diameter of the short connector 22. The base 23 is adaptedly connected to both the short connector 22 and the ball cup 21, thereby connecting the ball cup 21 to the short connector 22.

[0066] Optionally, such as Figure 2 As shown, the side wall of the base 23 is provided with external threads, and the side wall of the base 23 is threadedly connected to the inner wall of the shorting 22.

[0067] In some embodiments of this disclosure, such as Figure 2 As shown, a perforated structure 232 is provided on the base 23, which connects the cylinder 1 to the short connector 22. For example, the perforated structure 232 consists of four fan-shaped perforations, evenly distributed around the axis of the boss 231 on the base 23. The perforated structure 232 allows the interior of the short connector 22 to communicate with the interior of the cylinder 1, enabling gas or liquid in the tubing to enter below the pipe sealing device after the sealing ball 4 falls into the ball cup 21, thereby performing a backwashing operation on the oil well.

[0068] Figure 3 This is a schematic diagram of the structure of a tubing plugging device provided in an embodiment of this disclosure. For example, as shown... Figure 2-3 As shown, a threaded hole 212 is provided at one end of the ball cup 21 near the base 23, and the boss 231 is provided with external threads. The boss 231 and the ball cup 21 are connected by threads. It should be noted that the threaded hole 212 is a blind hole and does not communicate with the space inside the ball cup 21 used to accommodate the sealing ball 4.

[0069] Figure 4 This is a schematic diagram of another tubing plugging device provided in an embodiment of this disclosure. In some embodiments of this disclosure, such as... Figure 4 As shown, the oil pipe sealing device also includes a sliding member 3. One end of the sliding member 3 is located inside the ball cup 21, and the other end of the sliding member 3 is provided with a receiving hole 31. The shape of the receiving hole 31 is adapted to the sealing ball 4, and the diameter of the receiving hole 31 is smaller than the diameter of the sealing ball 4. The end of the sliding member 3 with the receiving hole 31 is used to support the sealing ball 4. The end of the sliding member 3 near the sealing ball 4 can provide elastic support for the sealing ball 4. The part of the sliding member 3 located inside the ball cup 21 is made of rigid material to be fixedly connected to the ball cup 21.

[0070] Optionally, see Figure 4The ball cup 21 has at least two first connecting holes 213 on its sidewall, and the sliding member 3 has at least two second connecting holes 32 on its sidewall, with each first connecting hole 213 aligned with a second connecting hole 32. The support member 2 also includes at least two pins 24, each pin 24 passing through a first connecting hole 213 and a second connecting hole 32 to fix the sliding member 3 in the ball cup 21. When the tubing is pressurized, the pressure acts on the sealing ball 4, which compresses the sliding member 3. The sliding member 3 applies a shearing force to the pins 24, causing them to break. The sealing ball 4 and the sliding member 3 then fall into the ball cup 21. The sealing ball 4 no longer blocks the ball seat 11, allowing the tubing to communicate with other components connected to the lower part of the cylinder 1, thus enabling backwashing operations on the oil well.

[0071] It should be noted that the sum of the length of the sliding member 3 and the diameter of the sealing ball 4 is less than the depth of the accommodating space in the ball cup 21, so that the sliding member 3 and the sealing ball 4 can be completely inserted into the ball cup 21, preventing the sliding member 3 and the sealing ball 4 from separating from the support member 2.

[0072] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0073] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0074] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0075] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0076] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this disclosure.

[0077] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A pipe sealing device, characterized in that, It includes a cylinder (1), a support (2), and a sealing ball (4); One end of the cylinder (1) is connected to the support (2), the other end of the cylinder (1) is used to connect to the oil pipe, and the support (2) is located at the end of the cylinder (1) away from the wellhead of the oil well; A ball seat (11) is provided inside the cylinder (1). The sealing ball (4) is located inside the cylinder (1) and between the ball seat (11) and the support member (2). A through hole (12) is provided on the ball seat (11). The support member (2) provides elastic support for the sealing ball (4), thereby squeezing the sealing ball (4) between the support member (2) and the ball seat (11) and making the sealing ball (4) seal the through hole (12).

2. The oil pipe plugging device according to claim 1, characterized in that, The support member (3) includes an elastic member (20) and a ball cup (21). One end of the elastic member (20) is connected to the ball cup (21), and the other end of the elastic member (20) elastically supports the sealing ball (4).

3. The oil pipe plugging device according to claim 2, characterized in that, The elastic element (20) includes at least two elastic rods (201), and the two elastic rods (201) are respectively provided with mutually close curved portions (202) at the middle position. The sealing ball (4) is located between the two elastic rods (201), and the curved portion (202) is configured to support the sealing ball (4).

4. The oil pipe plugging device according to claim 3, characterized in that, There are three elastic rods (201), and the distance between any two of the three elastic rods (201) and the connection point of the support member (2) is equal.

5. The oil pipe plugging device according to claim 3, characterized in that, The support member (2) also includes a short connector (22), which is connected to one end of the cylinder (1); The ball cup (21), the elastic element (20), and the sealing ball (4) are located between the short circuit (22) and the ball seat (11). One end of the ball cup (21) is connected to the short circuit (22), and the other end of the ball cup (21) is connected to the end of each elastic rod (201) away from the ball seat (11).

6. The oil pipe plugging device according to claim 5, characterized in that, The ball cup (21) has a cup mouth (211) facing the sealing ball (4), and the diameter of the cup mouth (211) is larger than the diameter of the sealing ball (4).

7. The oil pipe plugging device according to claim 5, characterized in that, The support member (2) also includes a base (23), which is connected to the end of the short connector (22) near the ball seat (11). A boss (231) is provided on the side of the base (23) near the ball seat (11), and the boss (231) is detachably connected to the side of the ball cup (21) away from the sealing ball (4).

8. The oil pipe plugging device according to claim 7, characterized in that, The short connector (22) is cylindrical, and the side wall of the base (23) is threadedly connected to the inner wall of the short connector (22).

9. The oil pipe plugging device according to claim 7, characterized in that, The base (23) is provided with a hollow structure (232), which connects the cylinder (1) to the short connector (22).

10. The tubing plugging device according to any one of claims 1-9, characterized in that, The ball seat (11) has a slope (13) on the side away from the sealing ball (4), the slope (13) surrounds the through hole (12), and the slope (13) is inclined toward the through hole (12).

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