A wellhead double-seal filler

Abstract

This utility model relates to a wellhead double-seal packer, belonging to the technical field of oil extraction equipment. It includes a packing box, lower sealing packing, an elastic compensation ring, a lower packing gland, an upper sealing packing, and an upper packing gland. The elastic compensation ring comprises an upper compensation ring and a lower compensation ring with conical pressing surfaces. Multiple guide posts are evenly distributed at the bottom of the upper compensation ring, and compensation rubber sleeves are fitted onto the guide posts. The upper and lower connecting flange rings are connected by locking bolts. This utility model, with its double-seal packing and elastic compensation ring, automatically compensates for gaps after wear, improving sealing reliability and reducing leakage rate by over 90%. The compensation spring and rubber sleeve work together to adapt to vibration and pressure changes under different well conditions. The guide posts, stepped holes, and limiting nut structure of the elastic compensation ring provide radial constraint and axial compensation movement space for the compensation ring, ensuring that the compensation force always acts axially on the sealing packing, avoiding force dispersion or uneven loading due to vibration.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil extraction equipment, specifically relating to a wellhead double-seal filler. Background Technology

[0002] In oilfield extraction operations, wellheads are sealed by packing to seal the sucker rods. Current sealing structures use a single layer of sealing packing in conjunction with a compensating spring for sealing and compensation. However, single-layer sealing packing is prone to wear, leading to seal failure, crude oil leakage, environmental pollution, and resource waste. Using only springs for compensation is prone to misalignment, causing uneven stress on the packing and affecting the sealing performance. Utility Model Content

[0003] Therefore, it is necessary to provide a wellhead dual-seal filler to address the existing technical problems.

[0004] To solve the problems of the existing technology, the technical solution adopted by this utility model is as follows:

[0005] A wellhead double-seal packer includes a packing box fitted onto a polished rod. The packing box contains lower sealing packing, with an elastic compensating ring in the middle. A lower packing cap, fixed to the top of the packing box, is located above the lower sealing packing. Upper sealing packing is located inside the lower packing cap, and an upper packing cap is located above the upper sealing packing. The elastic compensating ring includes an upper compensating ring and a lower compensating ring with conical pressing surfaces. Multiple guide posts are evenly distributed at the bottom of the upper compensating ring, and a stepped hole that mates with the guide posts is located at the top of the lower compensating ring. The lower end of each guide post extends into the stepped hole and is fixed with a limit nut. A compensating rubber sleeve is fitted onto the guide post, and a compensating spring is encased within the compensating rubber sleeve. Connecting flange rings are located on the outer top of both the upper and lower packing caps, and the upper and lower connecting flange rings are connected by locking bolts.

[0006] As a preferred embodiment, the top and bottom of the compensating rubber sleeve are provided with limiting bosses, and the upper and lower compensating rings are provided with limiting recesses that cooperate with the limiting bosses. During the assembly of the elastic compensating rings, the compensating rubber sleeve can be quickly positioned and limited.

[0007] As a preferred embodiment, an annular sealing groove is provided on the outer side wall of the lower end of the packing gland, and a sealing ring is provided in the annular sealing groove to prevent dust from entering the inner cavity of the packing gland.

[0008] As a preferred embodiment, a sealing cavity is provided in the bottom inner hole of the stuffing box, and an oil seal is provided in the sealing cavity to prevent lubricating oil leakage.

[0009] As a preferred embodiment, a fixing flange is provided on the outer bottom of the packing gland. The fixing flange is fixed to the top of the packing box by fixing bolts, and a sealing gasket is provided between the fixing flange and the packing box to prevent leakage.

[0010] As a preferred embodiment, an oil reservoir is fixed to the top of the packing gland, and multiple vertical oil guide grooves (I) are evenly distributed on the inner wall of the packing gland (II). Multiple vertical oil guide grooves (II) are evenly distributed on the inner wall of the packing gland (III). The lower part of the packing gland (IV) has two oil guide holes (I and II) respectively connecting its inner hole to the vertical oil guide grooves (I and II). The lower part of the packing gland (V) has three oil guide holes connecting its inner hole to the vertical oil guide grooves (I). The oil reservoir and oil guide structure continuously supply oil to the seals, reducing the coefficient of friction and extending equipment life.

[0011] As a preferred embodiment, the top of the packing gland is provided with a conical oil guide recess, and a support platform is provided on the outside of the oil guide recess to support the bottom of the oil reservoir. The oil guide recess facilitates lubrication flow, and the support platform can quickly support the bottom of the oil reservoir and facilitates welding and fixing.

[0012] As a preferred embodiment, the top of the oil reservoir is equipped with a scraper sleeve, and the inner hole of the scraper sleeve contains a scraper rubber sleeve. The inner hole of the scraper rubber sleeve is interference-fitted with the outer wall of the polished rod. Both the scraper sleeve and the scraper rubber sleeve are composed of two semi-circular sleeves. The scraper sleeve and the scraper rubber sleeve can clean impurities from the polished rod, reduce the entry of impurities into the lubricating or sealing parts, prevent abnormal wear, and increase the service life of the equipment.

[0013] The advantages of this utility model compared with the prior art are:

[0014] The double-sealed packing, combined with an elastic compensating ring, automatically compensates for gaps after wear, improving sealing reliability and reducing leakage rate by over 90%. The compensating spring and rubber sleeve work together to adapt to vibration and pressure changes under different well conditions. The guide post, stepped hole, and limiting nut structure of the elastic compensating ring provide radial constraint and axial compensation space, ensuring that the compensating force always acts axially on the sealing packing, preventing force dispersion or uneven loading due to vibration. Simultaneously, the damping characteristics of the compensating rubber sleeve absorb vibration energy, reducing fatigue damage to the compensating spring. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0016] Figure 2 yes Figure 1 Partial structural diagram;

[0017] Figure 3 yes Figure 1 Enlarged structural diagram at point A;

[0018] Figure 4 yes Figure 1 Enlarged structural diagram at point B;

[0019] Figure 5This is a schematic diagram of the bottom structure of the sludge scraper and the sludge scraper rubber sleeve;

[0020] The numbers on the map are:

[0021] 1. Polished rod; 2. Scraper sleeve; 3. Oil reservoir; 4. Oil guide recess; 5. Locking bolt; 6. Packing gland; 7. Sealing ring; 8. Oil guide hole three; 9. Vertical oil guide groove one; 10. Upper sealing packing; 11. Oil guide hole one; 12. Oil guide hole two; 13. Packing box; 14. Vertical oil guide groove two; 15. Lower compensation ring; 16. Lower sealing packing; 17. Oil seal; 18. Upper compensation ring; 19. Sealing gasket; 20. Scraper rubber sleeve; 21. Compensating spring; 22. Compensating rubber sleeve; 23. Limit nut; 24. Guide post. Detailed Implementation

[0022] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0023] Example 1, Reference Figures 1 to 5 A wellhead double-seal filler includes a packing box 13 fitted onto a polished rod 1. The packing box 13 contains a lower sealing packing 16, with an elastic compensation ring in the middle. A lower packing cap, fixed to the top of the packing box 13, is located above the lower sealing packing 16. An upper sealing packing 10 is located inside the lower packing cap, and an upper packing cap 6 is located above the upper sealing packing 10. The elastic compensation ring includes an upper compensation ring 18 with a tapered pressing surface and a lower compensation ring 15. Multiple guide posts 24 are evenly distributed at the bottom of the upper compensation ring 18. A stepped hole that mates with the guide posts 24 is located at the top of the lower compensation ring 15. The lower end of the guide post 24 extends into the stepped hole and is fixed with a limit nut 23. A compensation rubber sleeve 22 is fitted onto the guide post 24, and a compensation spring 21 is encased inside the compensation rubber sleeve 22. Connecting flange rings are provided on the outer top of both the upper and lower packing caps 6 and 6, and the upper and lower connecting flange rings are connected by locking bolts 5.

[0024] During installation, the compensating rubber sleeve 22 is fitted onto the guide post 24, and then the lower end of the guide post 24 is inserted into the stepped hole. The upper limit nut 23 is then fixed to the lower end of the guide post 24. The lower sealing packing 16 and the assembled elastic compensating ring are then installed into the inner cavity of the packing box 13. The lower packing cover is then placed on top, pressing down on the top of the lower sealing packing 16, so that the compensating rubber sleeve 22 and the compensating spring 21 are in a compressed state. The upper sealing packing 10 is then installed into the inner cavity of the lower packing cover, and the upper packing cover 6 is then placed on top. The clamping force of the upper packing cover 6 is adjusted using the locking bolt 5 to tighten the upper sealing packing 10, thus completing the seal.

[0025] In Example 2, based on Example 1, the compensation rubber sleeve 22 is provided with limiting bosses at both the top and bottom, and the upper compensation ring 18 and lower compensation ring 15 are provided with limiting recesses that cooperate with the limiting bosses. The compensation spring 21 is a stainless steel spring with a wire diameter of 1.5-2mm and 8-10 turns, and the compensation rubber sleeve 22 is made of fluororubber.

[0026] An annular sealing groove is provided on the outer side wall of the lower end of the packing gland 6, and a sealing ring 7 is provided inside the annular sealing groove.

[0027] The bottom inner hole of the stuffing box 13 is provided with a sealing cavity, and an oil seal 17 is provided in the sealing cavity.

[0028] A fixing flange is provided on the bottom outer side of the packing lower pressure cover. The fixing flange is fixed to the top of the packing box 13 by fixing bolts. A sealing gasket 19 is provided between the fixing flange and the packing box 13.

[0029] An oil reservoir 3 is fixed to the top of the packing gland 6. Multiple vertical oil guide grooves 9 are evenly distributed on the inner wall of the packing gland 13. Multiple vertical oil guide grooves 14 are evenly distributed on the inner wall of the packing box 13. The lower part of the packing gland has oil guide holes 11 and 12, respectively connecting its inner hole to the vertical oil guide grooves 9 and 14. The lower part of the packing gland 6 has an oil guide hole 8 connecting its inner hole to the vertical oil guide groove 9. When the locking bolt 5 is inserted into the mounting holes of the upper and lower connecting flange rings, the vertical oil guide groove 9 and the oil guide hole 8 are connected. When the flange hole on the bottom fixed flange of the packing gland 13 is aligned with the threaded hole on the top of the packing box 13, the oil guide hole 12 is connected to the vertical oil guide groove 14. Gaps are provided between the inner hole of the packing gland 6, the lower inner hole of the packing gland 13, and the outer wall of the optical shaft 1.

[0030] The top of the packing gland 6 is provided with a conical oil guiding recess 4, and a support platform for supporting the bottom of the oil reservoir 3 is provided on the outside of the oil guiding recess 4. During installation, the bottom of the oil reservoir 3 is embedded into the top support platform of the packing gland 6, and then welded in place. An oil filling nozzle is provided on the top of the oil reservoir 3.

[0031] The top of the oil reservoir 3 is equipped with a scraper sleeve 2, and the inner hole of the scraper sleeve 2 contains a scraper rubber sleeve 20. The inner hole of the scraper rubber sleeve 20 is interference-fitted with the outer wall of the optical shaft 1. Both the scraper sleeve 2 and the scraper rubber sleeve 20 are composed of two semi-circular sleeves. The scraper rubber sleeve 20 is made of silicone rubber or fluororubber with an interference fit of 0.1-0.3mm. The scraper sleeve 2 is fixed to the top of the oil reservoir 3 with bolts. There are gaps between the inner hole at the top of the oil reservoir 3, the inner hole at the top of the scraper sleeve 2, and the outer wall of the optical shaft 1.

[0032] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A wellhead double-seal filler, comprising a packing box (13) fitted onto a polished rod (1), wherein a lower sealing packing (16) is provided inside the packing box (13), an elastic compensation ring is provided in the middle of the lower sealing packing (16), and a packing lower pressure cap fixed to the top of the packing box (13) is provided above the lower sealing packing (16), characterized in that: The inner cavity of the packing lower pressure cover is provided with upper sealing packing (10), and the upper pressure cover (6) of the packing is provided above the upper sealing packing (10). The elastic compensation ring includes an upper compensation ring (18) with a conical pressing surface and a lower compensation ring (15). Multiple guide posts (24) are evenly provided at the bottom of the upper compensation ring (18). The top of the lower compensation ring (15) is provided with a stepped hole that cooperates with the guide post (24). The lower end of the guide post (24) extends into the stepped hole to fix a limit nut (23). A compensation rubber sleeve (22) is fitted on the guide post (24). A compensation spring (21) is wrapped inside the compensation rubber sleeve (22). The top outer sides of the packing upper pressure cover (6) and the packing lower pressure cover are provided with connecting flange rings. The upper and lower connecting flange rings are connected by locking bolts (5).

2. The wellhead double-seal filler according to claim 1, characterized in that, The top and bottom of the compensating rubber sleeve (22) are provided with limiting bosses, and the upper compensating ring (18) and the lower compensating ring (15) are provided with limiting recesses that cooperate with the limiting bosses.

3. The wellhead double-seal filler according to claim 1, characterized in that, An annular sealing groove is provided on the outer side wall of the lower end of the packing gland (6), and a sealing ring (7) is provided in the annular sealing groove.

4. A wellhead double-seal filler according to claim 1, characterized in that, The bottom inner hole of the stuffing box (13) is provided with a sealing cavity, and an oil seal (17) is provided in the sealing cavity.

5. A wellhead double-seal filler according to claim 1, characterized in that, A fixed flange is provided on the bottom outer side of the packing gland. The fixed flange is fixed to the top of the packing box (13) by fixing bolts. A sealing gasket (19) is provided between the fixed flange and the packing box (13).

6. A wellhead double-seal filler according to claim 1, characterized in that, The top of the packing upper cover (6) is fixed with an oil storage box (3). The inner wall of the packing lower cover is uniformly provided with multiple vertical oil guide grooves (9). The inner wall of the packing box (13) is uniformly provided with multiple vertical oil guide grooves (14). The lower part of the packing lower cover is provided with oil guide holes (11) and (12) respectively connecting its inner hole to the vertical oil guide grooves (9) and (14). The lower part of the packing upper cover (6) is provided with oil guide holes (8) connecting its inner hole to the vertical oil guide grooves (9).

7. A wellhead double-seal filler according to claim 6, characterized in that, The top of the packing gland (6) is provided with a conical oil guide recess (4), and the outside of the oil guide recess (4) is provided with a support platform for supporting the bottom of the oil storage box (3).

8. A wellhead double-seal filler according to claim 7, characterized in that, The top of the oil storage box (3) is provided with a scraper sleeve (2), and the inner hole of the scraper sleeve (2) is provided with a scraper rubber sleeve (20). The inner hole of the scraper rubber sleeve (20) is interference-fitted with the outer wall of the polished rod (1). Both the scraper sleeve (2) and the scraper rubber sleeve (20) are composed of two semi-circular sleeves.

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