Sealing device for petroleum wellhead

Abstract

The utility model discloses a sealing device for a petroleum wellhead, which relates to the field of petroleum wellhead sealing, and adopts the technical scheme that the sealing device comprises a well body and a device body, an external thread pipe is integrally formed at the upper end of the well body, and the external thread pipe is sleeved at the lower end in the device body in a threaded manner; threads opposite to the threads on the external threaded pipe are formed in the position, close to the bottom, of the interior of the device body, so that threaded connection of the device body and the external threaded pipe is achieved, an annular block is integrally formed at the top of the well body, an annular groove allowing the annular block to be inserted is formed in the bottom of the device body, and a sealing ring A is bonded to the interior of the annular groove; after the well body is rotationally installed on the outer threaded pipe, the annular block on the well body is also inserted into the annular groove, and the annular block makes contact with the sealing ring A. Compared with single face contact in a comparison file, the sealing ring is in a concave-convex matched contact mode, the contact face is larger, the sealing effect is better, and installation steps are not increased.

Description

Technical Field

[0001] The utility model relates to the field of oil wellhead sealing, and more specifically, to a sealing device for an oil wellhead. Background Art

[0002] An oil well is a channel drilled to exploit underground oil and natural gas resources. It plays an important role in oil extraction, and during the period when oil is not extracted, the wellhead needs to be sealed accordingly.

[0003] Most of the oil wellhead sealing devices are fixed at the oil wellhead by multiple bolts. Although the fixing by multiple bolts has high strength, it is troublesome during the installation process, which reduces the convenience of the installation process of the oil wellhead sealing device. Therefore, it is necessary to improve it. For this purpose, the announcement number: CN216553859U discloses a sealing device for an oil wellhead that can be tightly sealed. The invention can fix the oil wellhead sealing device at the oil wellhead by threaded connection, and then limit the rotation of the oil wellhead sealing device by a fixing mechanism, which effectively improves the convenience of the installation process of the oil wellhead sealing device. At the same time, the lower end of the main body and the upper end of the well body can be sealed by a sealing ring to prevent leakage at the connection between the main body and the well body.

[0004] However, the above invention only uses one sealing ring for surface contact sealing. The contact surface between the sealing ring and the connecting component is small, and the sealing effect is poor. If other sealing structures in the prior art are added, the steps for installing the sealing device will be increased, and the convenience level is low.

[0005] Therefore, in order to solve the above technical problems, the present application proposes a sealing device for an oil wellhead. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model aims to provide a sealing device for a petroleum wellhead.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sealing device for an oil wellhead, comprising a well body and a device body, the upper end of the well body is integrally formed with an external threaded pipe, the external threaded pipe is threadedly sleeved on the lower end of the device body, the interior of the device body near the bottom is provided with threads opposite to those on the external threaded pipe, thereby realizing a threaded connection between the two, the top of the well body is integrally formed with an annular block, the bottom of the device body is provided with an annular groove for inserting the annular block, a sealing ring A is bonded to the inside of the annular groove, after the well body is rotatably installed on the external threaded pipe, the annular block thereon is also inserted into the annular groove, and the annular block is in contact with the sealing ring A.

[0008] Preferably, a sealing ring B is bonded to the head of the externally threaded pipe and an annular plate is integrally formed on the inner wall of the well body to enhance the sealing.

[0009] Preferably, oil pipelines equipped with oil valves are provided on both sides of the well body, and the oil pipelines are used to extract the oil in the well body.

[0010] Preferably, a connecting plate A is welded to the side end of the device body, and a rotating rod is welded to the side end of the connecting plate A for facilitating the rotation of the device body. The connecting plate A increases the rotation force arm, so that the staff can more easily rotate the device body through the rotating rod.

[0011] Preferably, a locking assembly that cooperates with each other is provided between the connecting plate A and the device body.

[0012] Preferably, the locking assembly includes a connecting shell embedded and fixed inside the connecting plate A, and a connecting plate B fixed on the outer wall of the well body. The bottom of the connecting shell is open, and a lifting component for driving the fixed block to move downward is installed inside the connecting shell. The head of the connecting plate B is fixedly connected to a groove seat for inserting the fixed block. The fixed block is driven to move downward by the lifting component in the connecting shell and inserted into the groove seat, so that the rotation of the device body can be restricted to prevent the device body from being rotated by external force and affecting the sealing of the connection between it and the external threaded pipe.

[0013] Preferably, the lifting component includes a screw threadedly connected to the head of the connecting shell, the bottom end of the screw is rotatably connected to the movable plate through a bearing, guide rails are fixedly connected on both sides of the interior of the connecting shell, both sides of the movable plate are slidably connected to the guide rails through sliders, and the bottom end of the movable plate is fixed to the top of the fixed block through a vertical rod.

[0014] Preferably, a handle is fixedly connected to the top of the screw rod for facilitating its rotation, so that the staff can turn the screw rod conveniently.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model, after the device body and the external threaded pipe are threadedly connected, the annular block is also inserted into the annular groove on the device body. After the insertion is completed, the annular block contacts the sealing ring A in the annular groove to perform sealing. In this way, the sealing ring is in a concave-convex matching contact mode. Compared with the single surface contact in the comparative document, the contact surface of the sealing ring is larger and the sealing effect is better, and no installation steps are added, thereby solving the problem that the background technology uses a sealing ring for surface contact sealing, the contact surface between the sealing ring and the connecting component is small, and the sealing effect is poor. Adding other sealing structures in the prior art will increase the steps of installing the sealing device and the convenience is low.

[0017] 2. After the device body and the external threaded pipe are threadedly connected, the sealing ring B on the external threaded pipe is in contact with the bottom surface of the annular plate, thereby forming a one-circle seal. Thus, the sealing effect can be further improved through two layers of sealing.

[0018] 3. The utility model improves the turning force arm by connecting plate A, so that the staff can more easily turn the device body by turning the rod.

[0019] 4. The utility model drives the fixing block to move downward through the lifting component in the connecting shell, and inserts it into the groove seat, so as to limit the rotation of the device body, thereby preventing the device body from rotating due to external force and affecting the sealing performance of the connection with the external threaded pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 For this utility model Figure 1 A schematic diagram of the structure from another angle;

[0023] Figure 3 This is a schematic diagram of the bottom structure of the device body in the utility model;

[0024] Figure 4 It is a schematic diagram of the internal structure of the connecting shell in the utility model.

[0025] In the figure: 1, well body; 2, external threaded pipe; 3, device body; 4, annular block; 5, annular groove; 6, sealing ring A; 7, annular plate; 8, sealing ring B; 9, oil pipeline; 10, oil valve; 11, connecting plate A; 12, rotating rod; 13, locking assembly; 131, connecting shell; 1331, screw; 1332, moving plate; 1333, guide rail; 1334, slider; 1335, vertical rod; 1336, handle; 132, fixed block; 133, lifting component; 134, connecting plate B; 135, groove seat. DETAILED DESCRIPTION

[0026] like Figure 1-4As shown, the utility model provides a sealing device for an oil wellhead, comprising a well body 1 and a device body 3, wherein an externally threaded pipe 2 is integrally formed at the upper end of the well body 1, and the externally threaded pipe 2 is threadedly sleeved on the lower end of the device body 3, and a thread opposite to that on the externally threaded pipe 2 is provided near the bottom of the inside of the device body 3, so as to realize a threaded connection between the two, and through the structure of the device body 3 and the externally threaded pipe 2 being screwed together, the device body 3 can be fixedly installed on the well body 1 by means of a threaded connection, which effectively replaces the traditional method of fixing it by means of multiple bolts, and oil pipelines 9 equipped with oil valves 10 are provided on both sides of the well body 1, and the oil pipelines are used to extract the oil in the well body 1 (in order to clearly show the internal structure of the device body 3, the part of the oil pipeline located at the connection between the device body 3 and the inside of the well body 1 is not drawn), and the switch of the oil pipeline is controlled by the oil valve 10.

[0027] The following are improvements made by the utility model based on the prior art:

[0028] An annular block 4 is integrally formed on the top of the well body 1, and an annular groove 5 for inserting the annular block 4 is provided at the bottom of the device body 3. A sealing ring A6 is bonded inside the annular groove 5. After the well body 1 is rotated and installed on the external threaded tube 2, the annular block 4 thereon is also inserted into the annular groove 5, and the annular block 4 contacts the sealing ring A6. After the device body 3 and the external threaded tube 2 are threadedly connected, the annular block 4 is also inserted into the annular groove 5 on the device body 3. After the insertion is completed, the annular block 4 contacts the sealing ring A6 in the annular groove 5 (it should be noted that the sealing ring A6 is an adaptive design made according to the inner wall of the annular groove 5, and it can cover the inner wall of the arc groove) to perform sealing. In this way, the sealing ring has a larger contact surface and a better sealing effect through the contact method of concave-convex matching compared with the single surface contact in the comparative document.

[0029] Furthermore, the annular plate 7 is integrally formed on the inner wall of the well body 1, and the head of the externally threaded pipe 2 is bonded with a sealing ring B8, that is, after the device body 3 and the externally threaded pipe 2 are threadedly connected, the sealing ring B8 on the externally threaded pipe 2 is in contact with the bottom surface of the annular plate 7, forming another circle of sealing. In this way, the sealing effect can be further improved through two layers of sealing.

[0030] Among them, a connecting plate A11 is welded to the side end of the device body 3, and a rotating rod 12 for facilitating the rotation of the device body 3 is welded to the side end of the connecting plate A11. The connecting plate A11 increases the rotation force arm, so that the staff can more easily rotate the device body through the rotating rod 12 to achieve its installation with the external threaded pipe 2.

[0031] In order to ensure the stability of the connection between the external threaded pipe 2 and the device body 3: a locking assembly 13 that cooperates with each other is provided between the connecting plate A11 and the device body 3, and the locking assembly 13 includes a connecting shell 131 embedded and fixed inside the connecting plate A, and a connecting plate B134 fixed on the outer wall of the well body 1, the bottom of the connecting shell 131 is open, and a lifting component 133 for driving the fixed block 132 to move downward is installed inside the connecting shell 131, and the head of the connecting plate B134 is fixedly connected with a fixing block 132 for inserting The groove seat 135, that is, when the device body 3 is completely rotated on the external threaded tube 2, the fixed block 132 and the groove seat 135 are exactly on the same vertical line. The lifting component 133 in the connecting shell 131 drives the fixed block 132 to move downward and insert it into the groove seat 135, so that the rotation of the device body 3 can be restricted to prevent the device body 3 from being rotated by external force and affecting the sealing connection between it and the external threaded tube 2. Similarly, the lifting component 133 drives the fixed block 132 to move upward and pull it out from the groove seat 135 to cancel the restriction.

[0032] The utility model also provides a specific structure of the lifting component: the lifting component 133 includes a screw 1331 threadedly connected to the head of the connecting shell 131, the bottom end of the screw 1331 is rotatably connected to the moving plate 1332 through a bearing, the inner sides of the connecting shell 131 are fixedly connected with guide rails 1333, the two sides of the moving plate 1332 are slidably connected to the guide rails 1333 through sliders 1334, the bottom end of the moving plate 1332 is fixed to the top of the fixed block 132 through a vertical rod 1335, and the top of the screw 1331 is fixedly connected with The handle 1336 is convenient for rotating, that is, the handle 1336 is rotated clockwise or counterclockwise, the handle 1336 drives the screw 1331 to rotate clockwise or counterclockwise, the screw 1331 rotates along the movable plate 1332, and at the same time drives the movable plate 1332 to move up and down, the movable plate 1332 drives the slider 1334 to move up and down, the slider 1334 slides linearly up and down along the guide rail 1333 to maintain the movable plate 1332 to move linearly up and down, and the movable plate 1332 can drive the fixed block 132 to move linearly up and down through the vertical rod 1335.

[0033] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A sealing device for an oil wellhead, comprising a well body (1) and a device body (3), wherein the upper end of the well body (1) is integrally formed with an externally threaded pipe (2), the externally threaded pipe (2) is threadedly sleeved on the lower end of the device body (3), and the inside of the device body (3) near the bottom is provided with threads corresponding to the externally threaded pipe (2), so as to achieve a threaded connection between the two, characterized in that: An annular block (4) is integrally formed at the top of the well body (1), and an annular groove (5) is provided at the bottom of the device body (3) for the annular block (4) to be inserted into. A sealing ring A (6) is bonded inside the annular groove (5). After the well body (1) is rotatably mounted on the externally threaded pipe (2), the annular block (4) thereon is also inserted into the annular groove (5), and the annular block (4) is in contact with the sealing ring A (6).

2. The sealing device for a petroleum wellhead according to claim 1, characterized in that: An annular plate (7) is integrally formed on the inner wall of the well body (1), and a sealing ring B (8) is bonded to the head of the externally threaded tube (2).

3. The sealing device for a petroleum wellhead according to claim 1, characterized in that: Oil pipelines (9) equipped with oil valves (10) are provided on both sides of the well body (1).

4. The sealing device for a petroleum wellhead according to claim 1, characterized in that: A connecting plate A (11) is welded to the side end of the device body (3), and a rotating rod (12) for facilitating the rotation of the device body (3) is welded to the side end of the connecting plate A (11).

5. The sealing device for a petroleum wellhead according to claim 4, characterized in that: A locking assembly (13) that cooperates with each other is provided between the connecting plate A (11) and the device body (3).

6. The sealing device for a petroleum wellhead according to claim 5, characterized in that: The locking assembly (13) comprises a connection shell (131) embedded and fixed inside a connection plate A (11), and a connection plate B (134) fixed on the outer wall of the well body (1); the bottom of the connection shell (131) is open, a lifting component (133) for driving a fixed block (132) to move downward is installed inside the connection shell (131), and a groove seat (135) for inserting the fixed block (132) is fixedly connected to the head of the connection plate B (134).

7. The sealing device for a petroleum wellhead according to claim 6, characterized in that: The lifting component (133) comprises a screw rod (1331) threadedly connected to the head of the connecting shell (131); the bottom end of the screw rod (1331) is rotatably connected to the moving plate (1332) via a bearing; guide rails (1333) are fixedly connected to the two sides of the interior of the connecting shell (131); the two sides of the moving plate (1332) are slidably connected to the guide rails (1333) via sliders (1334); and the bottom end of the moving plate (1332) is fixed to the top of the fixed block (132) via a vertical rod (1335).

8. The sealing device for a petroleum wellhead according to claim 7, characterized in that: A handle (1336) is fixedly connected to the top end of the screw rod (1331) for facilitating its rotation.

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