A reinforced seal structure for a downhole heating cable wellhead crossing device

Abstract

The utility model relates to wellhead crossing device technical field, concretely for the reinforcing seal structure of oil and gas well downhole heating cable wellhead crossing device, including wellhead crossing device body, installation groove and connecting plug, the top of wellhead crossing device body is equipped with the threaded portion, the lower part outside of threaded portion is equipped with the gasket, the top of gasket is equipped with the lamination groove, the inner wall of lamination groove is installed rubber ring, the top of gasket is equipped with a plurality of thread grooves, the inner wall of thread groove is connected with the connecting screw rod, the top of connecting screw rod is installed rubber side piece, through when assembling wellhead crossing device, let its upper half and lower half between through threaded portion connection, and gradually contact between rubber side piece downwards, simultaneously, follow the lower shift of upper half to extrude rubber side piece and present extrusion deformation state, and cooperate between rubber ring, and then increase the sealing property of wellhead crossing device.

Description

Technical Field

[0001] This utility model relates to the field of wellhead crossing device technology, and more specifically, to a reinforced sealing structure for a wellhead crossing device for downhole heating cables in oil and gas wells. Background Technology

[0002] In the process of oil and gas well development, the wellhead crossing device for downhole heating cables plays a crucial role. It ensures the safe and stable crossing of heating cables at the wellhead, guaranteeing the normal operation of downhole operations and the effective extraction of oil and gas resources. However, existing wellhead crossing devices have some problems that urgently need to be solved in actual use, especially in the assembly process. These problems seriously affect the overall performance and effectiveness of the device.

[0003] Most common wellhead crossing devices use only a single sealing ring to achieve the sealing function during assembly. While this single sealing method can meet basic sealing requirements to a certain extent, the sealing effect of a single sealing ring gradually decreases when faced with complex downhole conditions due to large pressure differences, temperature changes, and chemical corrosion. As the usage time increases, the sealing ring will age or deform, thus making it impossible to reliably guarantee the sealing performance of the wellhead crossing device. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, this utility model provides a reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells, so as to solve the problem that the existing technology only uses a single sealing ring to increase the sealing performance of the wellhead crossing device assembly, which leads to aging or deformation after long-term use, thus affecting the sealing effect.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a reinforced sealing structure for a wellhead crossing device for downhole heating cables in oil and gas wells, including a wellhead crossing device body, an installation groove and a connecting plug. The top of the wellhead crossing device body is fitted with a threaded part, and a gasket is fitted on the lower outer side of the threaded part. The top of the gasket is provided with a fitting groove, and a rubber ring is installed on the inner wall of the fitting groove.

[0006] The gasket has multiple threaded grooves on its top, and a connecting screw is threaded to the inner wall of the threaded grooves. A rubber side block is installed on the top of the connecting screw, and a matching groove is formed on the side of the multiple rubber side blocks away from the threaded portion.

[0007] The rubber side blocks are attached to the top of the gasket, the fitting groove is attached to the outer side of the rubber ring, and the multiple rubber side blocks are arranged in a ring with the axis of the threaded part as the center.

[0008] The gasket has multiple inserts installed at its bottom, and each insert has a rubber protrusion on the side away from the threaded portion. The top of the wellhead crossing device body has multiple slots, and the inner wall of each slot has a groove.

[0009] The insert is inserted into the inner wall of the slot, and the multiple inserts are arranged in a ring around the axis of the threaded part.

[0010] The rubber protrusion is engaged with the inner wall of the slot and is subjected to compression deformation under pressure.

[0011] The gasket is installed at the top of the wellhead crossing device body, and the inner ring wall of the gasket fits against the outer side of the threaded part.

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

[0013] In the above scheme, when assembling the wellhead crossing device, the upper and lower halves are connected by a threaded part and gradually come into contact with the rubber side block downwards. At the same time, as the upper half moves downwards, the rubber side block is squeezed into a squeezed deformation state, and the fit between it and the rubber ring is improved, thereby increasing the sealing performance of the wellhead crossing device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is the right view of the present invention;

[0016] Figure 3 for Figure 2 Cross-sectional view of the structure at point AA;

[0017] Figure 4 This is a schematic diagram of the insert block structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the fitting groove structure of this utility model.

[0019] [Figure Labels]

[0020] 1. Wellhead crossing device body; 2. Threaded part; 3. Rubber side block; 4. Rubber ring; 5. Gasket; 6. Insert block; 7. Rubber protrusion; 8. Slot; 9. Slot; 10. Fitting groove; 11. Adhesive groove; 12. Threaded groove; 13. Connecting screw; 14. Mounting groove; 15. Connecting plug. Detailed Implementation

[0021] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1: Please refer to Figures 1 to 5 This utility model provides a technical solution: a reinforced sealing structure for a wellhead crossing device for downhole heating cables in oil and gas wells, including a wellhead crossing device body 1, an installation groove 14, and a connecting plug 15. In this paper, the wellhead crossing device body 1 is the lower half. A threaded part 2 is installed at the top of the wellhead crossing device body 1. A gasket 5 is fitted on the lower outer side of the threaded part 2. A fitting groove 11 is opened at the top of the gasket 5. A rubber ring 4 is installed on the inner wall of the fitting groove 11. The gasket 5 is installed at the top of the wellhead crossing device body 1, and the inner ring wall of the gasket 5 fits against the outer side of the threaded part 2, so that the wellhead crossing device body 1 can be assembled without the aid of an additional gasket 5.

[0023] In use, the upper and lower halves of the wellhead crossing device body 1 are connected by the threaded part 2. As the upper half moves down, it gradually comes into contact with the rubber side block 3 and pushes the rubber side block 3 to make it in a state of compression deformation, thereby improving the sealing performance of the wellhead crossing device body 1 after assembly. At the same time, the cooperation between it and the rubber ring 4 further improves the sealing performance of the wellhead crossing device body 1 after assembly.

[0024] Example 2: Based on Example 1, in order to facilitate the replacement of a single rubber side block 3 and increase the stability and sealing performance of the rubber ring 4 after it is fitted, the top of the gasket 5 is provided with multiple threaded grooves 12. The inner wall of the threaded grooves 12 is threaded with a connecting screw 13. The top of the connecting screw 13 is fitted with a rubber side block 3, which allows it to undergo elastic deformation and form an interference fit with the upper part, thereby improving the sealing effect. The side of the multiple rubber side blocks 3 away from the threaded part 2 is provided with a fitting groove 10. The rubber side block 3 fits against the top of the gasket 5, and the fitting groove 10 fits against the outer side of the rubber ring 4, so that the rubber ring 4 is fitted on the outer side of the multiple rubber side blocks 3 and fits against the fitting groove 10, thereby increasing the sealing performance and stability after it is fitted. The multiple rubber side blocks 3 are designed in a ring shape with the axis of the threaded part 2 as the center, so that they fit against the threaded part 2 after deformation, thereby increasing the sealing performance of the wellhead crossing device body 1 after assembly.

[0025] First, remove the rubber ring 4 and detach it from the mating groove 10 and the fitting groove 11. Then, remove the gasket 5 upwards and detach it from the outside of the threaded part 2. After that, rotate the rubber side block 3 so that the connecting screw 13 at its bottom gradually detaches from the threaded groove 12, thereby facilitating the disassembly of the mating grooves 10 one by one and reducing the replacement cost.

[0026] Example 3: Based on Example 2, in order to facilitate the removal of the entire gasket 5 for maintenance or replacement, multiple inserts 6 are installed at the bottom of the gasket 5. Rubber protrusions 7 are installed on the side of the multiple inserts 6 away from the threaded part 2. Multiple slots 8 are opened at the top of the wellhead crossing device body 1, and slots 9 are opened on the inner wall of the slots 8. The inserts 6 are inserted into the inner wall of the slots 8, and the multiple inserts 6 are arranged in a ring around the axis of the threaded part 2, so as to facilitate the insertion of the gasket 5 into the wellhead crossing device body 1. The rubber protrusions 7 are engaged in the inner wall of the slots 9 and are squeezed and deformed, thereby increasing the friction between the inserts 6 and the slots 8 to improve the stability of the gasket 5 installation.

[0027] First, pull the pad 5 upwards, causing the four inserts 6 at its bottom to disengage from the slot 8, and then causing the rubber protrusions 7 to disengage from the slot 9. Then, the components on the outside of the slot 9 can be maintained. After that, put the pad 5 downwards onto the outside of the threaded part 2. At the same time, insert the inserts 6 into the inner wall of the slot 8 and push the rubber protrusions 7 so that they are engaged with the inner wall of the slot 9 and are in a state of compression deformation, thereby improving the stability of the assembly and facilitating subsequent maintenance and use.

[0028] The working process of this utility model is as follows:

[0029] In use, the upper and lower halves of the wellhead crossing device body 1 are connected by the threaded part 2. As the upper half moves down, it gradually comes into contact with the rubber side block 3 and pushes the rubber side block 3 to make it deformed by compression, thereby improving the sealing performance of the wellhead crossing device body 1 after assembly. At the same time, the cooperation between it and the rubber ring 4 further improves the sealing performance of the wellhead crossing device body 1 after assembly. When it is necessary to disassemble the rubber side block 3, first remove the rubber ring 4 and disengage it from the mating groove 10 and the mating groove 11. Then, remove the gasket 5 upwards and disengage it from the outside of the threaded part 2. Then, the rubber side block 3 can be rotated so that the connecting screw 13 at the bottom gradually disengages from the threaded groove 12, thereby facilitating the disassembly of the mating groove 10 one by one and reducing the replacement cost.

[0030] When it is necessary to remove the gasket 5, first pull the gasket 5 upwards, causing the four inserts 6 at its bottom to disengage from the slot 8, and then causing the rubber protrusions 7 to disengage from the groove 9. Then, the components on the outside of the groove 9 can be maintained. After that, put the gasket 5 downwards onto the outside of the threaded part 2. At the same time, drive the inserts 6 into the inner wall of the slot 8 and push the rubber protrusions 7, so that they are locked in the inner wall of the groove 9 and in a state of compression deformation, thereby improving the stability of its assembly and facilitating subsequent maintenance and use.

[0031] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0032] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0033] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reinforced sealing structure for wellhead crossing devices of downhole heating cables in oil and gas wells, characterized in that, The device includes a wellhead crossing device body (1), an installation groove (14), and a connecting plug (15). The top of the wellhead crossing device body (1) is fitted with a threaded part (2). A gasket (5) is fitted on the lower outer side of the threaded part (2). A fitting groove (11) is opened on the top of the gasket (5). A rubber ring (4) is installed on the inner wall of the fitting groove (11).

2. The reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells according to claim 1, characterized in that, The top of the gasket (5) is provided with multiple threaded grooves (12), and the inner wall of the threaded grooves (12) is threaded with a connecting screw (13). The top of the connecting screw (13) is equipped with a rubber side block (3), and the side of the multiple rubber side blocks (3) away from the threaded part (2) is provided with a fitting groove (10).

3. The reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells according to claim 2, characterized in that, The rubber side block (3) is attached to the top of the gasket (5), the fitting groove (10) is attached to the outer side of the rubber ring (4), and the multiple rubber side blocks (3) are arranged in a ring with the axis of the threaded part (2) as the center.

4. The reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells according to claim 1, characterized in that, The bottom of the gasket (5) is equipped with multiple inserts (6), and each insert (6) is equipped with a rubber protrusion (7) on the side away from the threaded part (2). The top of the wellhead crossing device body (1) is provided with multiple slots (8), and the inner wall of the slots (8) is provided with a groove (9).

5. The reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells according to claim 4, characterized in that, The insert (6) is inserted into the inner wall of the slot (8), and the multiple inserts (6) are arranged in a ring with the axis of the threaded part (2) as the center.

6. The reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells according to claim 4, characterized in that, The rubber protrusion (7) is engaged with the inner wall of the slot (9) and is squeezed and deformed.

7. The reinforced sealing structure for the wellhead crossing device of downhole heating cable in oil and gas wells according to claim 1, characterized in that, The gasket (5) is installed at the top of the wellhead crossing device body (1), and the inner ring wall of the gasket (5) is in contact with the outer side of the threaded part (2).

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