Tongue plate ball seat

Abstract

The utility model discloses a tongue plate ball seat which comprises an upper connector and a lower connector connected to the upper connector, the upper connector is communicated with the lower connector, a sliding sleeve and a spring arranged on the sliding sleeve in a sleeved mode are arranged in the upper connector in a sliding mode, and the spring abuts against the interior of the upper connector. A tongue plate seat for limiting the sliding stroke of the sliding sleeve is installed in the upper connector, a tongue plate is rotatably installed on the tongue plate seat, and at least one shearing screw used for limiting rotation of the tongue plate is arranged on the tongue plate seat. A sealing hole matched with the pressure building ball is formed in the tongue plate; stable pressure building is achieved, the tongue plate for supporting the pressure building ball is prevented from falling off during pressure relief, and well leakage caused by improper sealing is reduced.

Description

Technical Field

[0001] This utility model relates to the field of tools for use with downhole hangers, and in particular to a tongue plate ball seat. Background Technology

[0002] In tailpipe cementing operations, a pressure-pressurizing ball is dropped from the wellhead. The ball seat provides a precise receiving position and sealing surface for the pressure-pressurizing ball. Once the pressure-pressurizing ball reaches the ball seat and settles firmly, it forms a seal, preventing the fluid inside the pipe from flowing further downwards, thus increasing the pressure inside the pipe. As the pressure inside the pipe continues to rise, when it reaches the pressure required for the hanger to set, the hydraulic cylinder of the hydraulic tailpipe hanger is activated. The hydraulic cylinder pushes the suspension mechanism, firmly setting the tailpipe hanger against the inner wall of the upper casing, suspending the tailpipe on the upper casing. After the tailpipe hanger has completed its setting, it is usually necessary to continue pressurizing to a higher pressure, causing the shear pins on the ball seat to break, and the ball seat to open. At this point, the ball seat forms a channel that allows fluid to pass through. Drilling fluid, cement slurry, and other fluids can enter the cavity between the tailpipe and the wellbore through the ball seat, achieving circulation. This provides a fluid channel for subsequent cementing and cementing operations, ensuring that the cement slurry can be evenly filled between the tailpipe and the well wall, improving cementing quality.

[0003] The ball seat is located below the hanger and integrates a tailpipe plugging function. Generally, this structure is located at the lower end of the casing, close to the bottom of the well. When encountering a highly deviated well, the pressure ball may not be able to reach the correct position. In existing ball seats, the pressure ball and the seat core fall together, and the seat core generally cannot pass through the rubber sleeve, which also dampens the subsequent circulation flow. The pressure that is released at the moment of the ball seat may cause well leakage risk in sensitive formations. Utility Model Content

[0004] (a) Technical issues

[0005] The purpose of this utility model is to provide a tongue plate ball seat that can stabilize the pressure and prevent the tongue plate supporting the pressure-reducing ball from falling off during pressure relief, and reduce well leakage caused by inadequate sealing.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A tongue plate ball seat includes an upper connector and a lower connector connected to the upper connector. The upper connector and the lower connector communicate with each other. A sliding sleeve and a spring sleeved on the sliding sleeve are slidably disposed inside the upper connector. The spring abuts against the upper connector. A tongue plate seat is installed inside the upper connector to limit the sliding stroke of the sliding sleeve. A tongue plate is rotatably mounted on the tongue plate seat. At least one shearing screw is provided on the tongue plate seat to limit the rotation of the tongue plate. A sealing hole adapted to a pressure ball is opened on the tongue plate.

[0009] Preferably, a fixing pin is installed on the tongue plate seat, and a rotating ear is provided on the tongue plate, the rotating ear being rotatably mounted on the fixing pin.

[0010] Preferably, the upper connector has a first stepped hole, the sliding sleeve has a first boss, the first boss slides in conjunction with the large hole of the first stepped hole, one end of the spring abuts against the first boss, the other end abuts against the first stepped hole, and the sliding sleeve slides in conjunction with the small hole of the first stepped hole.

[0011] Preferably, the tongue plate seat is provided with a guide portion extending toward the lower connector side, the guide portion being used to guide the tongue plate to rotate.

[0012] Preferably, the lower connector is provided with a second protrusion, which presses against the tongue plate seat.

[0013] Preferably, the upper connector has an annular groove, and the lower connector has a fastening hole, with a fastening screw threaded into the annular groove.

[0014] Preferably, a first sealing ring is provided between the upper connector and the lower connector, a second sealing ring is provided between the tongue plate seat and the lower connector and the sliding sleeve, and a third sealing ring is fitted on the tongue plate to seal with the sliding sleeve.

[0015] Preferably, the sliding sleeve has an inner conical surface at the opening facing the tongue plate, and the third sealing ring on the tongue plate abuts against the inner conical surface.

[0016] Preferably, the upper connector has a threaded hole at one end, and the lower connector has a threaded head at one end.

[0017] Preferably, the tongue plate seat is provided with a first connecting hole, and the tongue plate is provided with a second connecting hole corresponding to the first connecting hole, and the shearing screw is inserted into the first connecting hole and the second connecting hole.

[0018] (III) Beneficial Effects

[0019] The tongue plate is installed by rotating the tongue plate seat and is limited by the shear screw. After the pressure ball is inserted, a pressure seal is formed at the sealing hole. As the internal liquid pressure increases until the shear screw is cut, the spring pushes the sliding sleeve to slide through the tongue plate seat relative to the upper connector, limiting the tongue plate to the open state and preventing the tongue plate from swinging and causing flow blockage. After the tongue plate is opened, the pressure ball and internal liquid flow downward, while the tongue plate is limited in the lower connector and will not fall off. After the sliding sleeve moves into the tongue plate seat, it forms a seal with both the upper connector and the tongue plate seat, effectively avoiding the risk of well leakage. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the sliding sleeve in an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the tongue plate in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the upper connector in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the lower connector in an embodiment of the present invention;

[0025] exist Figures 1 to 5 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0026] Upper connector 1, first step hole 101, annular groove 102, connecting threaded hole 103, sliding sleeve 2, first boss 21, inner conical surface 22, spring 3, fixing screw 4, first sealing ring 5, tongue plate seat 6, guide part 61, second sealing ring 7, third sealing ring 8, tongue plate 9, sealing hole 91, rotating ear 92, fixing pin 10, shearing screw 11, lower connector 12, second boss 121, fastening hole 122, connecting threaded head 123. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] See Figures 1-5As shown in the figure, an embodiment of this utility model proposes a tongue plate ball seat, including an upper connector 1 and a lower connector 12 connected to the upper connector 1. The upper connector 1 and the lower connector 12 are in communication. A sliding sleeve 2 and a spring 3 sleeved on the sliding sleeve 2 are slidably provided in the upper connector 1, and the spring 3 abuts against the upper connector 1. A tongue plate seat 6 is installed in the upper connector 1 to limit the sliding stroke of the sliding sleeve 2. A tongue plate 9 is rotatably installed on the tongue plate seat 6. At least one shearing screw 11 is provided on the tongue plate seat 6 to limit the rotation of the tongue plate 9. A first connecting hole is provided on the tongue plate seat 6, and a second connecting hole corresponding to the first connecting hole is provided on the tongue plate 9. The shearing screw 11 is inserted into the first connecting hole and the second connecting hole. A sealing hole 91 adapted to the pressure ball is provided on the tongue plate 9. Specifically, after the application is installed, the pressure-locking ball is inserted and cooperates with the sealing hole 91 to form internal liquid pressure. The pressure continues until it is sufficient for the tongue plate 9 to cut the shear screw 11. Then, the tongue plate 9 rotates relative to the tongue plate seat 6 and opens. At this time, the internal liquid and the pressure-locking ball flow downwards synchronously to below the lower connector 12. When the tongue plate 9 opens, the spring 3 pushes the sliding sleeve 2 to move relative to the upper connector 1 and into the tongue plate seat 6 to limit the open state of the tongue plate 9, preventing the tongue plate 9 from swinging due to liquid flow.

[0029] Specifically, a fixing pin 10 is installed on the tongue plate seat 6, and a rotating ear 92 is provided on the tongue plate 9. The rotating ear 92 is rotatably installed on the fixing pin 10. The connecting ear is rotatably connected to the fixing pin 10, so that the entire tongue plate 9 can rotate relative to the tongue plate seat 6 with the fixing pin 10 as the rotation center.

[0030] In order to guide the sliding of the sleeve 2 after installation and to accommodate the spring 3, a first stepped hole 101 is provided in the upper connector 1, and a first boss 21 is provided on the sleeve 2. The first boss 21 slides in cooperation with the large hole of the first stepped hole 101. One end of the spring 3 abuts against the first boss 21 and the other end abuts against the first stepped hole 101. The sleeve 2 slides in cooperation with the small hole of the first stepped hole 101, thereby limiting the position of the spring 3 and guiding and limiting the movement of the sleeve 2.

[0031] Meanwhile, a guide portion 61 extending toward the lower connector 12 is provided on the tongue plate seat 6. The guide portion 61 is used to guide the tongue plate 9 to rotate. On the one hand, it guides the tongue plate 9 to rotate in the correct direction. On the other hand, after the sliding sleeve 2 passes through the tongue plate seat 6, it is guided and limited by the guide portion 61.

[0032] Specifically, an annular groove 102 is provided on the upper connector 1, and a fastening hole 122 is provided on the lower connector 12. A fastening screw that extends into the annular groove 102 is threaded into the fastening hole 122. The connection between the upper connector 1 and the lower connector 12 is achieved by fastening the screw into the fastening hole 122 and inserting it into the annular groove 102.

[0033] Meanwhile, a first sealing ring 5 is provided between the upper connector 1 and the lower connector 12, and a second sealing ring 7 is provided between the tongue plate seat 6 and the lower connector 12 and the sliding sleeve 2. A third sealing ring 8 is fitted on the tongue plate 9 to seal with the sliding sleeve 2, so that the connection parts are sealed to avoid leakage of internal high-pressure liquid and well leakage.

[0034] Specifically, an inner conical surface 22 is provided at the opening on the side of the sliding sleeve 2 facing the tongue plate 9. The third sealing ring 8 on the tongue plate 9 abuts against the inner conical surface 22. When the tongue plate 9 is in the closed state, the sealing is achieved by the third sealing ring 8 and the inner conical surface 22 fitting together, which meets the pressure sealing requirements and avoids leakage.

[0035] Meanwhile, a connecting threaded hole 103 is provided at the end of the upper connector 1, and a connecting threaded head 123 is provided at the end of the lower connector 12. The entire tongue plate 9 ball seat is installed and connected through the connecting threaded hole 103 and the connecting threaded head 123.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical 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 utility model according to the specific circumstances.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A tongue plate ball seat, characterized in that: The device includes an upper connector (1) and a lower connector (12) connected to the upper connector (1). The upper connector (1) and the lower connector (12) are connected. A sliding sleeve (2) and a spring (3) sleeved on the sliding sleeve (2) are slidably provided in the upper connector (1). The spring (3) abuts against the upper connector (1). A tongue plate seat (6) is installed in the upper connector (1) to limit the sliding stroke of the sliding sleeve (2). A tongue plate (9) is rotatably installed on the tongue plate seat (6). At least one shearing screw (11) is provided on the tongue plate seat (6) to limit the rotation of the tongue plate (9). The tongue plate (9) is provided with a sealing hole (91) adapted to the pressure ball.

2. The tongue plate ball seat according to claim 1, characterized in that: A fixing pin (10) is installed on the tongue plate seat (6), and a rotating ear (92) is provided on the tongue plate (9). The rotating ear (92) is rotatably installed on the fixing pin (10).

3. The tongue plate ball seat according to claim 1, characterized in that: The upper connector (1) is provided with a first stepped hole (101), and the sliding sleeve (2) is provided with a first boss (21). The first boss (21) slides in cooperation with the large hole of the first stepped hole (101). One end of the spring (3) abuts against the first boss (21), and the other end abuts against the first stepped hole (101). The sliding sleeve (2) slides in cooperation with the small hole of the first stepped hole (101).

4. The tongue plate ball seat according to claim 1, characterized in that: The tongue plate seat (6) is provided with a guide portion (61) extending toward the lower connector (12), and the guide portion (61) is used to guide the tongue plate (9) to rotate.

5. A tongue plate ball seat according to any one of claims 1-4, characterized in that: The lower connector (12) is provided with a second boss (121), which presses against the tongue plate seat (6).

6. The tongue plate ball seat according to claim 5, characterized in that: The upper connector (1) has an annular groove (102) and the lower connector (12) has a fastening hole (122). A fastening screw that extends into the annular groove (102) is threaded into the fastening hole (122).

7. A tongue plate ball seat according to claim 6, characterized in that: A first sealing ring (5) is provided between the upper connector (1) and the lower connector (12), and a second sealing ring (7) is provided between the tongue plate seat (6), the lower connector (12), and the sliding sleeve (2). A third sealing ring (8) is fitted on the tongue plate (9) to seal with the sliding sleeve (2).

8. The tongue plate ball seat according to claim 7, characterized in that: The sliding sleeve (2) has an inner conical surface (22) at the opening facing the tongue plate (9), and the third sealing ring (8) on the tongue plate (9) abuts against the inner conical surface (22).

9. A tongue plate ball seat according to claim 8, characterized in that: The upper connector (1) has a threaded hole (103) at its end, and the lower connector (12) has a threaded head (123) at its end.

10. A tongue plate ball seat according to claim 5, characterized in that: The tongue plate seat (6) is provided with a first connecting hole, and the tongue plate (9) is provided with a second connecting hole corresponding to the first connecting hole. The shear screw (11) is inserted into the first connecting hole and the second connecting hole.

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