Plugging device for well cementation of oil well

Abstract

The plugging device comprises an oil well body, a well cementation casing pipe is connected to the inner wall of the oil well body in a clamped mode, internal threads are formed in the inner wall of the well cementation casing pipe, an expansion sealing rubber plug is fixedly connected to the inner wall of the well cementation casing pipe, a conical hole is formed in the inner wall of the expansion sealing rubber plug, and the expansion sealing rubber plug is fixedly connected with the inner wall of the oil well body. And a sealing plug is clamped to the inner wall of the conical hole, and a sealing bearing is fixedly embedded in the upper surface of the sealing plug. According to the device, through the arrangement of the well cementation casing pipe, the expansion sealing rubber plug, the conical hole, the plugging plug, the sealing bearing, the plugging extrusion rod and the connecting column head, the plugging extrusion rod can be rotated to drive the connecting column head to rotate, and through threaded connection fit with the well cementation casing pipe, the plugging plug can be driven to move downwards to be extruded and embedded into the expansion sealing rubber plug; the oil well plugging device is simple in structure, convenient to operate, convenient to disassemble subsequently and worthy of popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field development technology, and in particular to a sealing device for cementing oil wells. Background Technology

[0002] Cementing refers to the process of inserting a casing of a certain size into the wellbore after a stage of drilling operations, and injecting cement slurry between the casing and the well wall. After the cement slurry solidifies, it forms a high-strength cement stone that tightly separates the oil, gas and water layers. In the process of cementing oil wells, packers are often used.

[0003] Among them, the utility model patent with announcement number CN210858648U discloses a sealing device for cementing oil wells. However, the above patent still has some shortcomings in use. The annular sealing steel plate is welded to the top of the oil well casing, but the welding method is not convenient for subsequent disassembly operations, which reduces the sealing effect of the oil well. Therefore, we propose a sealing device for cementing oil wells to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a sealing device for cementing oil wells to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sealing device for oil well cementing includes an oil well body, a cementing casing is clamped to the inner wall of the oil well body, the inner wall of the cementing casing has internal threads, an expansion sealing plug is fixedly connected to the inner wall of the cementing casing, a tapered hole is formed in the inner wall of the expansion sealing plug, a sealing head is clamped to the inner wall of the tapered hole, a sealing bearing is fixedly embedded in the upper surface of the sealing head, a sealing extrusion rod is fixedly connected to the inner ring of the sealing bearing, a connecting pin is fixedly connected to the outer surface of the sealing extrusion rod, the outer surface of the connecting pin has external threads, and the outer surface of the connecting pin is threadedly connected to the inner wall of the cementing casing.

[0007] In a further embodiment, the cementing casing is fixedly connected to the inner wall of the well body by a cement grouting process.

[0008] In a further embodiment, a snap-fit ​​connector is fixedly connected to the top end of the sealing and squeezing rod, and an installation hole is provided on the front side of the snap-fit ​​connector.

[0009] In a further embodiment, a probe is fixedly connected to the bottom end of the sealing head, and the probe is made of rubber.

[0010] In a further embodiment, the upper surface of the bulging sealing plug is provided with an annular sealing groove, and the bottom surface of the sealing head is fixedly connected with an annular sealing strip that matches the annular sealing groove.

[0011] In a further embodiment, a model mark is fixedly connected to the upper surface of the connecting column head, and the model mark is located behind the sealing and extrusion rod.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This device, consisting of a cementing casing, an expanding sealing plug, a tapered orifice, a sealing head, a sealing bearing, a sealing extrusion rod, and a connecting pin, allows the sealing extrusion rod to rotate, driving the connecting pin to rotate as well. Through its threaded connection with the cementing casing, the sealing head moves downwards and is pressed into the interior of the expanding sealing plug, thus sealing the oil well. This oil well sealing device has a simple structure, is easy to operate, and is convenient for subsequent disassembly, making it worthy of widespread use. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall three-dimensional structure of a sealing device for cementing oil wells.

[0015] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the cementing casing in an oil well cementing plugging device.

[0016] Figure 3 This is a sectional view of the cementing casing in an oil well cementing plugging device, taken from a top view.

[0017] Figure 4 This is a top view of the cementing casing in an oil well cementing plugging device.

[0018] Figure 5 For sealing devices used in oil well cementing Figure 2 A magnified structural diagram of part A in the middle.

[0019] In the diagram: 1. Well body; 2. Connector; 3. Mounting hole; 4. Internal thread; 5. Connecting head; 6. Sealing rod; 7. Cementing casing; 8. Model mark; 9. Probe; 10. Bulk sealing plug; 11. Sealing bearing; 12. Sealing head; 13. Annular sealing strip; 14. Annular sealing groove; 15. Tapered hole; 16. External thread. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5In this utility model, a sealing device for cementing oil wells includes an oil well body 1. A cementing casing 7 is clamped to the inner wall of the oil well body 1. The inner wall of the cementing casing 7 has an internal thread 4. An expansion sealing plug 10 is fixedly connected to the inner wall of the cementing casing 7. A conical hole 15 is opened in the inner wall of the expansion sealing plug 10. A sealing head 12 is clamped to the inner wall of the conical hole 15. A sealing bearing 11 is fixedly embedded on the upper surface of the sealing head 12. A sealing extrusion rod 6 is fixedly connected to the inner ring of the sealing bearing 11. The outer surface of the plugging extrusion rod 6 is fixedly connected to a connecting pin 5. The outer surface of the connecting pin 5 is provided with an external thread 16. The outer surface of the connecting pin 5 is threadedly connected to the inner wall of the cementing casing 7. By rotating the plugging extrusion rod 6 and the connecting pin 5, and by utilizing the threaded connection between the connecting pin 5 and the cementing casing 7, the plugging head 12 can be driven to move downward and squeezed into the interior of the bulging sealing plug 10, thus forming a sealing mechanism, which facilitates the cementing and plugging operation of the oil well body 1.

[0024] The cementing casing 7 is fixedly connected to the inner wall of the well body 1 by a cement slurry injection process. The cement slurry solidifies to form a high-strength cement stone, which facilitates the stable use of the cementing casing 7. The top of the plugging extrusion rod 6 is fixedly connected to a clamping connector 2. The front of the clamping connector 2 has an installation hole 3. The clamping connector 2 and the installation hole 3 can be used to connect and install the plugging extrusion rod 6 to the transmission mechanism, which facilitates subsequent mechanical plugging operations. The bottom of the plugging head 12 is fixedly connected to a probe 9. The probe 9 is made of rubber. The probe 9 can assist the plugging head 12 to move downward, which facilitates the plugging operation of the cementing casing 7.

[0025] The upper surface of the bulging sealing plug 10 is provided with an annular sealing groove 14. The bottom surface of the sealing head 12 is fixedly connected with an annular sealing strip 13 that matches the annular sealing groove 14. The sealing connection between the annular sealing strip 13 and the annular sealing groove 14 can be used to increase the sealing effect between the sealing head 12 and the bulging sealing plug 10, which facilitates the effective sealing of the oil well body 1. The upper surface of the connecting column head 5 is fixedly connected with a model mark 8. The model mark 8 is located behind the sealing extrusion rod 6. The model mark 8 can be used to describe the model of this oil well sealing device, which is convenient for oil well sealing personnel to understand and use.

[0026] The working principle of this utility model is as follows:

[0027] In use, the cementing casing 7 is first fixed to the inner wall of the well body 1 using cement grouting. Then, the well plugging equipment, such as the sealing head 12 and the connecting pin head 5, is inserted into the inside of the cementing casing 7 and connected to the power transmission unit through the clamping connector 2. This drives the sealing extrusion rod 6 and the connecting pin head 5 to rotate. By utilizing the threaded connection between the connecting pin head 5 and the cementing casing 7, the sealing head 12 can be moved downward and squeezed into the inside of the bulging sealing plug 10. At the same time, the annular sealing strip 13 is tightly inserted into the inside of the annular sealing groove 14 to form a sealing mechanism, thus completing the cementing and plugging operation of the well body 1.

[0028] 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.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing device for cementing oil wells, characterized in that: The well body (1) is included. A cementing casing (7) is attached to the inner wall of the well body (1). The inner wall of the cementing casing (7) has an internal thread (4). An expansion sealing plug (10) is fixedly connected to the inner wall of the cementing casing (7). A conical hole (15) is opened in the inner wall of the expansion sealing plug (10). A sealing head (12) is attached to the inner wall of the conical hole (15). A sealing bearing (11) is fixedly embedded on the upper surface of the sealing head (12). A sealing extrusion rod (6) is fixedly connected to the inner ring of the sealing bearing (11). A connecting pin (5) is fixedly connected to the outer surface of the sealing extrusion rod (6). An external thread (16) is opened on the outer surface of the connecting pin (5). The outer surface of the connecting pin (5) is threaded to the inner wall of the cementing casing (7).

2. The well cementing plugging device according to claim 1, characterized in that: The cementing casing (7) is fixedly connected to the inner wall of the well body (1) by a cement grouting process.

3. The well cementing plugging device according to claim 1, characterized in that: The top end of the sealing and squeezing rod (6) is fixedly connected to a clamping connector (2), and the front side of the clamping connector (2) is provided with an installation hole (3).

4. The well cementing plugging device according to claim 1, characterized in that: The bottom end of the sealing head (12) is fixedly connected to a probe (9), which is made of rubber.

5. The well cementing plugging device according to claim 1, characterized in that: The upper surface of the bulging sealing plug (10) is provided with an annular sealing groove (14), and the bottom surface of the sealing head (12) is fixedly connected with an annular sealing strip (13) that is compatible with the annular sealing groove (14).

6. The well cementing plugging device according to claim 1, characterized in that: A model mark (8) is fixedly connected to the upper surface of the connecting column head (5), and the model mark (8) is located behind the sealing and squeezing rod (6).

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