Wellhead packing box

Abstract

The utility model relates to a wellhead packing box, which belongs to the technical field of oil exploitation equipment and comprises a box body sleeved on a polish rod, a packing, bushes, a packing pad and a pressing sleeve, a centralizing copper sleeve sleeved on the polish rod is arranged at the bottom of the lowest bushing, a plurality of mounting holes are uniformly arranged on the box body on the outer side of the centralizing copper sleeve, heat conduction columns are arranged in the mounting holes, and the packing pad is arranged on the packing box. A heat dissipation sleeve is sleeved on the box body on the outer side of the heat conduction column, a plurality of heat dissipation fins are evenly fixed on the outer side wall of the heat dissipation sleeve, and a fixed turnup is arranged at the bottom of the heat dissipation sleeve and fixed on a flange at the bottom of the box body through a bolt. The centralizing copper sleeve is arranged on the lower portion of the inner cavity of the box body, the polish rod can be centralized and prevented from inclining, the hardness of the centralizing copper sleeve is smaller than that of the polish rod, the polish rod cannot be damaged even if the polish rod is eccentrically abraded, the centralizing copper sleeve is better in heat conduction capacity, heat dissipation is better achieved through the heat conduction column, the heat dissipation sleeve and the heat dissipation fins, and the sealing effect is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil extraction equipment, specifically relating to a wellhead packing box. Background Technology

[0002] In oilfield operations, wellhead packing boxes are crucial for sealing polished rods, and their performance directly impacts the safety and economy of the operation. With continued use, existing wellhead packing boxes have led to increased polished rod wear in pumping wells, causing scratches, corrosion, and accelerated packing wear, resulting in oil spills. Currently, a centralizing sleeve is installed in the middle of the packing box for alignment. However, this current centralizing sleeve is too hard, easily scratching the polished rod, and has poor heat transfer, making it difficult for the generated heat to dissipate, thus affecting the packing seal. Utility Model Content

[0003] Therefore, it is necessary to provide a wellhead packing box 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 packing box includes a box body fitted onto a polished rod. Multiple packing rings are arranged along the axial direction of the polished rod inside the box body. Each packing ring has a bushing below it. The top of the uppermost packing ring has a packing pad. Above the packing pad is a pressure sleeve installed on the top of the box body. The bottom of the lowermost bushing has a straightening copper sleeve fitted onto the polished rod. Multiple mounting holes are evenly distributed on the box body outside the straightening copper sleeve. Heat-conducting columns are installed within the mounting holes. A heat-dissipating sleeve is fitted on the box body outside the heat-conducting columns. Multiple heat-dissipating fins are evenly fixed on the outer wall of the heat-dissipating sleeve. A fixing flange is provided at the bottom of the heat-dissipating sleeve, and the fixing flange is fixed to a flange at the bottom of the box body by bolts.

[0006] The outer wall of the copper sleeve has a corresponding mounting hole for inserting the inner end of the heat-conducting column. The inner wall of the heat sink sleeve has an annular slot for inserting the outer end of the heat-conducting column, which facilitates heat conduction. The inner side of the heat sink fins passes through the heat sink sleeve and extends into the annular slot for better heat dissipation.

[0007] The bottom of the straightening copper sleeve is fixed with a positioning post, and the bottom of the inner cavity of the box is provided with a positioning hole that cooperates with the positioning post, which can quickly position the straightening copper sleeve and quickly make the mounting hole correspond to the insertion hole.

[0008] The heat sink consists of two semi-circular sleeves, each with a fixed flange at the bottom for easy installation and fixation.

[0009] The lower outer part of the compression sleeve is fitted onto the top of the housing. A guide post is provided on the inner bottom of the compression sleeve. A rubber sleeve is fitted on the outer side of the guide post, and a spring is wrapped inside the rubber sleeve. The top of the packing pad is provided with a guide hole that mates with the guide post. This can automatically compensate for the gap caused by packing wear, extend the packing replacement cycle, and reduce maintenance costs.

[0010] The bottom outer side of the pressure sleeve is equipped with a connecting flange. Multiple slots are evenly distributed on the outer circumference of the connecting flange. A rotating seat is located below each slot. A locking bolt is rotatably mounted on the rotating seat, moving in and out of the slot. The locking bolt has a locking cap. A support ring is fixed to the inner side of the rotating seat and is fixed to the outer wall of the housing. This allows for quick disassembly of the pressure sleeve, facilitating replacement of the rubber sleeve and maintenance of the internal seals.

[0011] The bottom of the support ring is fixed with a reinforcing rib, and the inner side of the reinforcing rib is fixed to the outer wall of the box. The top and bottom of the rubber sleeve are provided with positioning bosses, and the pressure sleeve and packing pad are provided with positioning grooves that cooperate with the positioning bosses for quick positioning of the rubber sleeve.

[0012] A sealing groove is provided at the top of the center hole of the pressure sleeve, and a sealing ring is placed inside the sealing groove. A rectangular retaining ring is placed above the sealing ring, with its outer side wall contacting the inner wall of the sealing groove. A gap is provided between the inner side wall of the rectangular retaining ring and the outer wall of the polished rod. A clamping nut is threadedly connected to the upper part of the sealing groove to clamp the rectangular retaining ring, and a gap is provided between the inner hole of the clamping nut and the outer wall of the polished rod. This seals the gap between the pressure sleeve and the polished rod, preventing slurry from entering the pressure sleeve, accelerating the wear of the polished rod, and affecting its service life. Furthermore, when the sealing ring wears down and affects the seal, the clamping nut can be rotated to further compress the sealing ring, ensuring the sealing effect and extending the service life of the sealing ring.

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

[0014] By installing a straightening copper sleeve in the lower part of the box cavity, the guide rod can be straightened to prevent skewing. The straightening copper sleeve is less hard than the guide rod, so even if it wears off, it will not damage the guide rod. In addition, the straightening copper sleeve has better thermal conductivity, which is then better dissipated through the heat conduction pillar, heat dissipation sleeve and heat dissipation fins to ensure the sealing effect. Attached Figure Description

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

[0016] Figure 2 This is a top view of the heat sink structure.

[0017] Figure 3 yes Figure 1 Partial structural diagram;

[0018] The numbers on the map are:

[0019] 1. Housing; 2. Smooth rod; 3. Packing gasket; 4. Bushing; 5. Packing; 6. Press sleeve; 7. Straightening copper sleeve; 8. Heat-conducting column; 9. Heat dissipation sleeve; 10. Fixing flange; 11. Positioning column; 12. Flange; 13. Annular slot; 14. Heat dissipation fins; 15. Mounting hole; 16. Support ring; 17. Locking bolt; 18. Opening groove; 19. Rubber sleeve; 20. Compression screw sleeve; 21. Rectangular retaining ring; 22. Sealing ring; 23. Guide column; 24. Spring. Detailed Implementation

[0020] 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.

[0021] Example 1, Reference Figures 1 to 3 A wellhead packing box includes a box body 1 fitted onto a polished rod 2. Multiple packing rings 5 ​​are arranged axially along the polished rod 2 inside the box body 1. A bushing 4 is provided below each packing ring 5. A packing pad 3 is provided at the top of the uppermost packing ring 5. A pressure sleeve 6, installed on the top of the box body 1, is provided above the packing pad 3. A straightening copper sleeve 7, fitted onto the polished rod 2, is provided at the bottom of the lowermost bushing 4. Multiple mounting holes 15 are evenly distributed on the box body 1 outside the straightening copper sleeve 7. A heat-conducting column 8, made of copper, is provided inside the mounting holes 15. A heat-dissipating sleeve 9, also made of copper, is fitted onto the box body 1 outside the heat-conducting column 8. Multiple heat-dissipating fins 14 are evenly fixed on the outer wall of the heat-dissipating sleeve 9. A fixing flange 10 is provided at the bottom of the heat-dissipating sleeve 9, and the fixing flange 10 is fixed to a flange 12 at the bottom of the box body 1 by bolts. The gap between the inner wall of the straightening copper sleeve 7 and the outer wall of the smooth rod 2 is ≤0.5mm; a gap is left between the inner wall of the packing pad 3 and the bushing 4 and the outer wall of the smooth rod 2, and this gap is larger than the gap between the inner wall of the straightening copper sleeve 7 and the outer wall of the smooth rod 2. The heat dissipation sleeve 9 and the heat dissipation fins 14 are made of aluminum alloy or copper.

[0022] During installation, the straightening copper sleeve 7 is placed into the housing 1, followed by the bushing 4 and packing 5. The top of the packing 5 is then pressed down using the packing gasket 3. The housing 1 is then fitted onto the polished rod 2, and the pressure sleeve 6 is put on. The flange 12 at the bottom of the housing 1 is then fixed to the Christmas tree. The pressure sleeve 6 is used to press the packing gasket 3, thereby compressing the packing 5 for sealing. During operation, the straightening copper sleeve 7 will straighten the polished rod 2. Because the hardness of the straightening copper sleeve 7 is less than that of the polished rod 2, even if there is uneven wear, it will not damage the polished rod 2. The heat generated by friction will be transferred to the heat dissipation fins 14 of the heat dissipation sleeve 9 through the heat conduction column 8 for rapid heat dissipation.

[0023] In Example 2, based on Example 1, the outer wall of the straightening copper sleeve 7 is provided with an insertion hole for the inner end of the heat conduction column 8 to be inserted at the mounting hole 15. The inner wall of the heat dissipation sleeve 9 is provided with an annular slot 13 for the outer end of the heat conduction column 8 to be inserted. The inner side of the heat dissipation fin 14 passes through the heat dissipation sleeve 9 and extends into the annular slot 13.

[0024] The bottom of the straightening copper sleeve 7 is fixed with a positioning post 11, and the bottom of the inner cavity of the box body 1 is provided with a positioning hole that cooperates with the positioning post 11.

[0025] The heat sink sleeve 9 consists of two semi-circular sleeves, each with a fixed flange 10 at its bottom. When the copper sleeve 7 is installed, the positioning pin 11 is inserted into the positioning hole, aligning with the mounting hole 15. Then, the heat-conducting pin 8 is inserted into the outer side of the mounting hole 15, with its inner end inserted into the insertion hole. The two semi-circular sleeves are then joined together and fitted onto the lower outer side of the housing 1, with the outer end of the heat-conducting pin 8 inserted into the annular slot 13. Finally, the fixed flange 10 is secured to the flange 12 using bolts.

[0026] The lower outer side of the pressure sleeve 6 is fitted onto the top of the box body 1. The bottom inner side of the pressure sleeve 6 is provided with a guide post 23. The outer side of the guide post 23 is fitted with a rubber sleeve 19. The rubber sleeve 19 is filled with a spring 24. The top of the packing pad 3 is provided with a guide hole that cooperates with the guide post 23.

[0027] The bottom outer side of the pressure sleeve 6 is provided with a connecting flange 12. Multiple opening slots 18 are evenly distributed on the outer periphery of the connecting flange 12. A rotating seat is provided below each opening slot 18. A locking bolt 17 is rotatably mounted on the rotating seat, moving in and out of the opening slot 18 by rotation. A locking cap is provided on the locking bolt 17. A support ring 16 is fixed to the inner side of the rotating seat and is fixed to the outer wall of the housing 1. During installation of the pressure sleeve 6, the rubber sleeve 19 can be placed on the guide post 23, and then the guide post 23 can be inserted into the guide hole. The locking bolt 17 is then rotated to enter the opening slot 18, and the locking cap is tightened. This compresses the rubber sleeve 19 and the spring 24, providing a downward preload to the packing gasket 3. This automatically compensates for the gaps caused by wear on the packing 5, extends the replacement cycle of the packing 5, and reduces maintenance costs.

[0028] The bottom of the support ring 16 is fixed with a reinforcing rib, and the inner side of the reinforcing rib is fixed to the outer wall of the box 1. The top and bottom of the rubber sleeve 19 are provided with positioning bosses, and the pressure sleeve 6 and the packing pad 3 are provided with positioning grooves that cooperate with the positioning bosses.

[0029] A sealing groove is provided at the top of the center hole of the pressure sleeve 6. A sealing ring 22 is provided inside the sealing groove. A rectangular retaining ring 21 is provided above the sealing ring 22. The outer wall of the rectangular retaining ring 21 contacts the inner wall of the sealing groove. There is a gap between the inner wall of the rectangular retaining ring 21 and the outer wall of the smooth rod 2. A clamping screw 20 is threadedly connected to the upper part of the sealing groove to clamp the rectangular retaining ring 21. There is a gap between the inner hole of the clamping screw 20 and the outer wall of the smooth rod 2. After a period of use, the sealing ring 22 will wear. The clamping screw 20 can be rotated to press down the rectangular retaining ring 21. The rectangular retaining ring 21 further squeezes the sealing ring 22, so that the sealing ring 22 fits the smooth rod 2 and the sealing groove better.

[0030] 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 packing box, comprising a box body (1) sleeved on a polished rod (2), a plurality of packings (5) are arranged in the box body (1) along the axis of the polished rod (2), a bushing (4) is arranged below each packing (5), a packing pad (3) is arranged on the top of the uppermost packing (5), and a pressing sleeve (6) is arranged above the packing pad (3) and mounted on the top of the box body (1), characterized in that: The bottom of the bushing (4) is provided with a straightening copper sleeve (7) fitted on the light rod (2). Multiple mounting holes (15) are evenly provided on the outer side of the box (1) of the straightening copper sleeve (7). A heat-conducting column (8) is provided in the mounting hole (15). A heat-dissipating sleeve (9) is fitted on the outer side of the box (1) of the heat-conducting column (8). Multiple heat-dissipating fins (14) are evenly fixed on the outer side wall of the heat-dissipating sleeve (9). A fixing flange (10) is provided at the bottom of the heat-dissipating sleeve (9). The fixing flange (10) is fixed to the flange (12) at the bottom of the box (1) by bolts.

2. A wellhead packing box according to claim 1, characterized in that The outer wall of the straightening copper sleeve (7) is provided with an insertion hole for inserting the inner end of the heat conduction column (8) at the corresponding mounting hole (15). The inner wall of the heat dissipation sleeve (9) is provided with an annular slot (13) for inserting the outer end of the heat conduction column (8). The inner side of the heat dissipation fin (14) passes through the heat dissipation sleeve (9) and extends into the annular slot (13).

3. A wellhead packing box according to claim 1, characterized in that The bottom of the straightening copper sleeve (7) is fixed with a positioning post (11), and the bottom of the inner cavity of the box body (1) is provided with a positioning hole that cooperates with the positioning post (11).

4. A wellhead packing box according to claim 1, characterized in that The heat dissipation sleeve (9) consists of two semi-circular sleeves, and the bottom of each semi-circular sleeve is fixed with a fixed flange (10).

5. A wellhead packing box according to claim 4, characterised in that The lower outer side of the pressure sleeve (6) is fitted onto the top of the box body (1). The bottom inner side of the pressure sleeve (6) is provided with a guide post (23). The outer side of the guide post (23) is fitted with a rubber sleeve (19). The rubber sleeve (19) is filled with a spring (24). The top of the packing pad (3) is provided with a guide hole that cooperates with the guide post (23).

6. A wellhead packing box according to claim 5, characterised in that The bottom outer side of the pressure sleeve (6) is provided with a connecting flange (12). Multiple opening slots (18) are evenly provided on the outer periphery of the connecting flange (12). A rotating seat is provided below each opening slot (18). A locking bolt (17) is rotatably installed on the rotating seat, which moves in and out of the opening slot (18) by rotation. A locking cap is provided on the locking bolt (17). A support ring (16) is fixed on the inner side of the rotating seat. The support ring (16) is fixed on the outer wall of the box body (1).

7. A wellhead packing box according to claim 6, characterised in that The bottom of the support ring (16) is fixed with a reinforcing rib, and the inner side of the reinforcing rib is fixed to the outer wall of the box body (1). The top and bottom of the rubber sleeve (19) are provided with positioning bosses, and the pressure sleeve (6) and the packing pad (3) are provided with positioning grooves that cooperate with the positioning bosses.

8. A wellhead packing box according to claim 1, characterized in that, The top of the center hole of the pressure sleeve (6) is provided with a sealing groove, and a sealing ring (22) is provided in the sealing groove. A rectangular retaining ring (21) is provided above the sealing ring (22). The outer side wall of the rectangular retaining ring (21) contacts the inner wall of the sealing groove. There is a gap between the inner side wall of the rectangular retaining ring (21) and the outer wall of the smooth rod (2). The upper part of the sealing groove is threaded with a clamping screw sleeve (20) that clamps the rectangular retaining ring (21). There is a gap between the inner hole of the clamping screw sleeve (20) and the outer wall of the smooth rod (2).

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