Well drilling top drive flushing pipe assembly structure

Abstract

The utility model discloses a well drilling top drive wash pipe assembly structure, which relates to the technical field of wash pipe sealing and comprises a wash pipe body, an upper connecting union connected to the upper end of the wash pipe body and a lower connecting union connected to the lower end of the wash pipe body. A packing assembly is arranged between the washing pipe body and the lower connecting union and comprises a packing base pipe, a lower end sealing seat, a plurality of sets of abrasion-resistant packing, a plurality of stages of spacer rings and an upper end sealing seat, wherein the packing base pipe is arranged on the periphery of the washing pipe body in a sleeving mode and forms a packing ring cavity, and the lower end sealing seat, the multiple sets of abrasion-resistant packing, the multiple stages of spacer rings and the upper end sealing seat are sequentially arranged in the packing ring cavity in a sleeved mode in the axial direction. The washing pipe is characterized in that a grease groove surrounding the washing pipe body is formed in the inner wall of the upper end sealing seat, and the grease groove is filled with lubricating grease. According to the utility model, the lubricating effect of the rotary seal between the washing pipe body and the packing assembly can be provided, and the friction is reduced, so that the effects of reducing the abrasion speed and prolonging the service life are achieved.

Description

Technical Field

[0001] The utility model relates to the field of drilling top drive equipment, and specifically, to a structure of a drilling top drive swivel joint assembly. Background Art

[0002] The swivel joint assembly is a very important part of the top drive drilling device. The upper end face of the swivel joint assembly is generally connected and matched with the static parts of the upper gooseneck pipe, and the lower end face is connected and matched with the rotating parts of the top drive main shaft. Therefore, the upper and lower parts of the swivel joint need to consider the sealing link, and the middle needs to solve the sealing conversion and matching from dynamic sealing to static sealing. In the traditional technology, packing is usually set for sealing. The upper sealing structure is composed of an ordinary packing sleeved in the upper sealing box. The upper union is an integral structure with the upper sealing box. By tightening the upper union, the packing and the upper part of the swivel joint can achieve a sealing effect. The lower sealing box and the lower union are an integral structure. The packing is placed in the lower sealing box. By tightening the lower union, the packing and the swivel joint can be fitted to achieve sealing. During the working process, large friction will occur between the packing and the swivel joint, resulting in an accelerated wear speed of the packing, shortening the service life, thus affecting the drilling efficiency and increasing the production and equipment maintenance costs. Summary of the Utility Model

[0003] The utility model provides a structure of a drilling top drive swivel joint assembly, which solves the problems of fast wear speed and short service life of the packing in the prior art.

[0004] To achieve the above object, the technical solution provided by the utility model is as follows:

[0005] A structure of a drilling top drive swivel joint assembly includes a swivel joint body, an upper union connected to the upper end of the swivel joint body, and a lower union connected to the lower end of the swivel joint body. A packing assembly is arranged between the swivel joint body and the lower union. The packing assembly includes a packing base pipe sleeved on the outer periphery of the swivel joint body to form a packing ring cavity, a lower end sealing seat, multiple groups of wear-resistant packings, multiple-stage spacer rings, and an upper end sealing seat axially sleeved and stacked in the packing ring cavity in sequence.

[0006] An oil groove surrounding the swivel joint body is formed on the inner wall of the upper end sealing seat, and lubricating grease is filled in the oil groove.

[0007] The above technical measures provide lubrication for the rotary seal between the swivel joint body and the packing assembly during the operation of the equipment by arranging an oil groove on the inner wall of the upper end sealing seat and filling lubricating grease in the oil groove, reducing friction, so as to achieve the effect of reducing the wear speed and extending the service life.

[0008] Further, an oil injection nozzle communicating with the packing ring cavity is connected to the packing base pipe of the packing assembly; the oil injection nozzle is used to inject lubricating oil into the packing ring cavity. The above technical measure can provide a lubricating effect between various devices by setting the oil injection nozzle communicating with the packing ring cavity.

[0009] Further, on the inner wall of the upper end seal seat of the packing assembly, a centering seat is provided above the grease groove; centering rings sleeved on the swab pipe body are arranged on the centering seat. The above technical measure can reduce the sway between the swab pipe body and the packing components by setting the centering rings, ensure the concentricity of the equipment during operation, improve the stability, and at the same time reduce the friction, so as to achieve the effect of extending the service life.

[0010] Further, the centering rings on the upper end seal seat are arranged in the middle area of the swab pipe body. The above technical measure can more effectively balance the pressure by arranging the centering rings in the middle area of the swab pipe body, reduce the wear caused by uneven force or vibration, and at the same time improve the structural stability;

[0011] Further, the wear-resistant packing in the packing ring cavity is distributed between the lower end seal seat and the adjacent spacer ring, between adjacent spacer rings, and between the upper end seal seat and the adjacent spacer ring; there are mating gaps between the lower end seal seat and the adjacent spacer ring, between adjacent spacer rings, and between the upper end seal seat and the adjacent spacer ring in the packing ring cavity respectively.

[0012] Further, on the inner wall of the upper end seal seat, at least one first seal groove surrounding the swab pipe body is provided, and an auxiliary sealing ring surrounding the swab pipe body is filled in the first seal groove; on the inner wall of the lower end seal seat, at least one second seal groove surrounding the swab pipe body is provided, and an auxiliary sealing ring surrounding the swab pipe body is filled in the second seal groove; on the inner wall of at least one spacer ring, at least one third seal groove surrounding the swab pipe body is provided, and an auxiliary sealing ring surrounding the swab pipe body is filled in the third seal groove. The above technical measure further enhances the sealing effect and extends the operation time of the equipment by setting the auxiliary sealing rings.

[0013] Further, the packing assembly further includes a compression nut; the compression nut is sleeved on the outer periphery of the upper end seal seat and forms a rabbet fit with the upper end seal seat; the compression nut is in threaded connection with the packing base pipe, and in the initial state, there is an adjustment stroke reserved between the upper end of the packing base pipe and the inner end of the compression nut. The above technical measure can adapt to different environmental changes and working conditions by adjusting the compression force on the packing assembly, and at the same time extends the operation time of the equipment and reduces the maintenance and production costs.

[0014] Furthermore, a sealing ring is provided between the flushing pipe body and the upper union; the sealing ring is sleeved on the outer periphery of the upper end of the flushing pipe body, and the upper end of the flushing pipe body is in limit fit with the upper end of the inner hole of the sealing ring in a keyway structure; at least one fourth sealing groove surrounding the flushing pipe body is formed in the inner wall of the middle part of the sealing ring, and a sealing ring surrounding the flushing pipe body is filled in the fourth sealing groove. The above technical measures fix the upper end of the flushing pipe body and the sealing ring by setting the keyway structure and the sealing ring, enhancing the stability of the connection.

[0015] Furthermore, a circumferential fifth sealing groove is formed in the upper end face of the sealing ring, and a sealing ring is filled in the fifth sealing groove; the upper end face of the sealing ring is connected to the lower end face of the gooseneck pipe through the sealing ring. The above technical measures seal the upper end face of the sealing ring and the lower end face of the gooseneck pipe by setting the sealing ring.

[0016] One or more technical solutions provided by the present utility model at least have the following technical effects or advantages:

[0017] In the present utility model, by setting the grease groove surrounding the flushing pipe body, the friction generated during the operation between the flushing pipe body and the packing component is reduced, and the lubricating effect is provided, so as to achieve the purpose of reducing the packing wear speed and extending the service life.

[0018] In the present utility model, by setting the centering ring, the shaking between the flushing pipe body and the packing component is reduced, the concentricity of the equipment operation is ensured, the working stability is improved, so as to reduce the packing wear speed and achieve the effect of extending the service life.

[0019] In the present utility model, by setting the auxiliary sealing ring, the sealing effect is enhanced, the equipment operation time is extended, and it can better adapt to the working environment of high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, and constitute a part of the present utility model, without constituting a limitation to the embodiments of the present utility model;

[0021] Figure 1 It is a schematic structural diagram of a drilling top drive flushing pipe assembly structure in the present utility model;

[0022] Figure 2 It is a schematic diagram when a drilling top drive flushing pipe assembly structure in the present utility model is applied;

[0023] Figure 3 It is a schematic top view structural diagram of a drilling top drive flushing pipe assembly structure in the present utility model;

[0024] Among them, 1. Flushing pipe body; 2. Upper connecting union; 3. Lower connecting union; 4. Packing base pipe; 5. Lower end sealing seat; 6. Wear-resistant packing; 7. Spacer ring; 8. Upper end sealing seat; 9. Grease groove; 10. Grease injection nozzle; 11. Centralizer seat; 12. First sealing groove; 121. Second sealing groove; 122. Third sealing groove; 13. Compression nut; 14. Sealing ring; 15. Fifth sealing groove; 16. Fourth sealing groove; 17. Sixth sealing groove; 18. Seventh sealing groove; 19. Eighth sealing groove; 20. Circlip groove; 21. Gooseneck pipe; 22. Central cover support body; 23. Top drive main shaft. Specific embodiments

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0026] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0027] Referring to Figure 1 , this embodiment provides a structure of a drilling top drive flushing pipe assembly, including a flushing pipe body 1, an upper connecting union 2 connected to the upper end of the flushing pipe body 1, and a lower connecting union 3 connected to the lower end of the flushing pipe body 1; a packing assembly is arranged between the flushing pipe body 1 and the lower connecting union 3, and the packing assembly includes a packing base pipe 4 sleeved on the outer periphery of the flushing pipe body 1 to form a packing ring cavity, and a lower end sealing seat 5, multiple groups of wear-resistant packings 6, multiple stages of spacer rings 7, and an upper end sealing seat 8 axially sleeved in the packing ring cavity in sequence;

[0028] An inner wall of the upper end sealing seat 8 is provided with a grease groove 9 surrounding the flushing pipe body 1, and the grease groove 9 is filled with lubricating grease.

[0029] In the above-mentioned embodiment, the surface of the flushing pipe body 1 is made of a high-strength wear-resistant alloy material, the wear-resistant packing 6 is made of a high-performance material, the number of stages of the spacer ring 7 can be 3, the number of groups of wear-resistant packings can be 4, and the installation sequence is the lower end sealing seat, wear-resistant packing, spacer ring, wear-resistant packing, spacer ring, wear-resistant packing, spacer ring, wear-resistant packing, upper end sealing seat; during use, the lubricating grease in the grease groove provides lubrication for the rotational seal between the flushing pipe body and the packing assembly, reducing friction.

[0030] Referring to Figure 1, in some embodiments of the present utility model, an oil injection nozzle 10 communicating with the packing ring cavity is connected to the packing base pipe 4 of the packing assembly; the oil injection nozzle 10 is used to inject lubricating oil into the packing ring cavity.

[0031] In the above embodiments, during use, the oil injection nozzle 10 can inject lubricating oil into the packing ring cavity to reduce friction during the operation of each device.

[0032] Refer to Figure 1 , in some embodiments of the present utility model, on the inner wall of the upper end sealing seat 8 of the packing assembly, a centering seat 11 is provided above the grease groove 9; centering rings sleeved on the swab tube body 1 are arranged on the centering seat 11.

[0033] In the above embodiments, during the operation of the device, centering rings are provided to limit the shaking between devices and ensure the concentricity of the device operation.

[0034] Refer to Figure 1 , in some embodiments of the present utility model, the centering rings on the upper end sealing seat 8 are arranged in the middle area of the swab tube body 1.

[0035] Refer to Figure 1 , in some embodiments of the present utility model, the wear-resistant packing 6 in the packing ring cavity is distributed between the lower end sealing seat 5 and the adjacent spacer ring, between adjacent spacer rings, and between the upper end sealing seat 8 and the adjacent spacer ring; there are mating gaps respectively between the lower end sealing seat 5 and the adjacent spacer ring, between adjacent spacer rings, and between the upper end sealing seat 8 and the adjacent spacer ring in the packing ring cavity.

[0036] Refer to Figure 1 , in some embodiments of the present utility model, on the inner wall of the upper end sealing seat 8, at least one first sealing groove 12 surrounding the swab tube body 1 is provided, and an auxiliary sealing ring surrounding the swab tube body 1 is filled in the first sealing groove 12; on the inner wall of the lower end sealing seat 5, at least one second sealing groove 121 surrounding the swab tube body 1 is provided, and an auxiliary sealing ring surrounding the swab tube body 1 is filled in the second sealing groove 121; on the inner wall of at least one stage of spacer ring 7, at least one third sealing groove 122 surrounding the swab tube body 1 is provided, and an auxiliary sealing ring surrounding the swab tube body 1 is filled in the third sealing groove 122.

[0037] In the above embodiments, there is one first sealing groove 12 on the inner wall of the upper end sealing seat 8, one second sealing groove 121 on the inner wall of the lower end sealing seat 5, and one third sealing groove 122 on the inner wall of the first-stage spacer ring 7. The auxiliary sealing ring is made of wear-resistant material. During use, the auxiliary sealing ring and the wear-resistant packing cooperate with each other, enhancing the sealing effect and extending the operation time of the device.

[0038] Refer to Figure 1, in some embodiments of the present utility model, the packing assembly further includes a compression nut 13; the compression nut 13 is sleeved on the outer periphery of the upper end sealing seat 8 and forms a rabbet fit with the upper end sealing seat 8; the compression nut 13 is in threaded connection with the packing base tube 4, and in the initial state, there is an adjustment stroke reserved between the upper end of the packing base tube 4 and the inner end of the compression nut 13.

[0039] In the above embodiment, during use, the compression nut 13 rotates downward to give the packing assembly an initial pre-tightening force, so that the wear-resistant packing 6 is closely attached to the swab tube body 1 to achieve sealing; later, after the packing assembly is worn during use, the compression nut 13 is rotated downward regularly, and a downward force is applied to make the wear-resistant packing 6 deform and continue to be closely attached to the swab tube body, so as to continue to achieve the sealing purpose.

[0040] Refer to Figure 1 and Figure 3 , in some embodiments of the present utility model, a sealing ring 14 is provided between the swab tube body 1 and the upper connecting union 2; the sealing ring 14 is sleeved on the outer periphery of the upper end of the swab tube body 1, and the upper end of the swab tube body 1 and the upper end of the inner hole of the sealing ring 14 are in limit fit with a keyway structure; at least one fourth sealing groove 16 surrounding the swab tube body is provided on the inner wall of the middle part of the sealing ring 14, and a sealing ring surrounding the swab tube body 1 is filled in the fourth sealing groove 16.

[0041] In the above embodiment, the way that the upper end of the swab tube body 1 and the upper end of the inner hole of the sealing ring 14 are in limit fit with a keyway structure can be: by providing an inner hole in the sealing ring 14 and providing a keyway at the edge of the inner hole, a swab key matching the keyway is provided on the upper part of the swab tube body 1, a snap ring groove 20 for installing a snap ring is provided on the upper part of the swab key, the swab key and the keyway can be arc-shaped, the swab key is inserted into the inner hole keyway to fix the sealing ring 14 and the swab tube body 1, and after installation, a snap ring is provided in the snap ring groove 20, and the snap ring can be an annular snap ring to prevent the swab tube body 1 from withdrawing or sliding out of the sealing ring 14 in the longitudinal direction and ensure the longitudinal stability of the connection.

[0042] Refer to Figure 1-2 , in some embodiments of the present utility model, a circumferential fifth sealing groove 15 is provided on the upper end surface of the sealing ring 14, and a sealing ring is filled in the fifth sealing groove 15; the upper end surface of the sealing ring 14 is connected to the lower end surface of the gooseneck tube 21 through the sealing ring.

[0043] Refer to Figure 1 , in some embodiments of the present utility model, the upper end sealing seat 8 is provided with a sixth sealing groove 17, and a sealing ring for sealing the packing base tube 4 and the upper end sealing seat 8 is provided in the sixth sealing groove.

[0044] Refer to Figure 1-2, in some embodiments of the present utility model, the lower end sealing seat 5 is provided with a seventh sealing groove 18 and an eighth sealing groove 19. The seventh sealing groove 18 is provided with a sealing ring for sealing the lower end sealing seat 5 and the base pipe 4 of the disc, and the eighth sealing groove 19 is provided with a sealing ring for sealing the lower end face of the lower end sealing seat 5 and the upper end face of the top drive main shaft 23.

[0045] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present utility model.

[0046] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A drilling top drive flushing pipe assembly structure, comprising a flushing pipe body (1), an upper connecting union (2) connected to the upper end of the flushing pipe body (1), and a lower connecting union (3) connected to the lower end of the flushing pipe body (1); a packing assembly is arranged between the flushing pipe body (1) and the lower connecting union (3), and the packing assembly comprises a packing base pipe (4) sleeved on the outer periphery of the flushing pipe body (1) to form a packing annular cavity, a lower end sealing seat (5) axially stacked in sequence in the packing annular cavity, multiple groups of wear-resistant packings (6), multiple-stage spacer rings (7), and an upper end sealing seat (8); Features: The inner wall of the upper end sealing seat (8) is provided with a grease groove (9) surrounding the flushing tube body (1), and the grease groove (9) is filled with lubricating grease.

2. The drilling top drive flushing pipe assembly structure according to claim 1 is characterized in that: The packing base pipe (4) of the packing assembly is connected to an oil injection nozzle (10) communicating with the packing annular cavity; The oil injection nozzle (10) is used to inject lubricating oil into the packing ring cavity.

3. The drilling top drive flushing pipe assembly structure according to claim 1 is characterized in that: The inner wall of the upper sealing seat (8) of the packing assembly is provided with a straightening seat (11) located above the grease groove (9); A straightening ring mounted on the flushing pipe body (1) is arranged on the straightening seat (11).

4. The drilling top drive flushing pipe assembly structure according to claim 3 is characterized by: The straightening ring on the upper end sealing seat (8) is arranged in the middle area of ​​the flushing pipe body (1).

5. The drilling top drive flushing pipe assembly structure according to claim 1, 2 or 3, characterized in that: The wear-resistant packing (6) in the packing ring cavity is distributed between the lower end sealing seat (5) and the adjacent spacer ring, between the adjacent spacer rings, and between the upper end sealing seat (8) and the adjacent spacer ring; There are matching gaps between the lower end sealing seat (5) and the adjacent spacer ring, between the adjacent spacer rings, and between the upper end sealing seat (8) and the adjacent spacer ring in the packing ring cavity.

6. The drilling top drive flushing pipe assembly structure according to claim 5 is characterized in that: The inner wall of the upper end sealing seat (8) is provided with at least one first sealing groove (12) surrounding the flushing pipe body (1), and the first sealing groove (12) is filled with an auxiliary sealing ring surrounding the flushing pipe body (1); The inner wall of the lower end sealing seat (5) is provided with at least one second sealing groove (121) surrounding the flushing pipe body (1), and the second sealing groove (121) is filled with an auxiliary sealing ring surrounding the flushing pipe body (1); The inner wall of at least one primary spacer ring (7) is provided with at least one third sealing groove (122) surrounding the flushing tube body (1), and the third sealing groove (122) is filled with an auxiliary sealing ring surrounding the flushing tube body (1).

7. The drilling top drive flushing pipe assembly structure according to claim 5 is characterized by: The packing assembly also includes a compression nut (13); The compression nut (13) is sleeved on the outer circumference of the upper end sealing seat (8) and forms a stop fit with the upper end sealing seat (8); The clamping nut (13) is threadedly connected to the packing base pipe (4), and in an initial state, an adjustment stroke is reserved between the upper end of the packing base pipe (4) and the inner end of the clamping nut (13).

8. The drilling top drive flushing pipe assembly structure according to claim 1 is characterized by: A sealing ring (14) is provided between the flushing pipe body (1) and the upper connecting union (2); The sealing ring (14) is sleeved on the outer periphery of the upper end of the flushing tube body (1), and the upper end of the flushing tube body (1) and the upper end of the inner hole of the sealing ring (14) are limitedly matched by a keyway structure; The middle inner wall of the sealing ring (14) is provided with at least one fourth sealing groove (16) surrounding the flushing tube body, and the fourth sealing groove (16) is filled with a sealing ring surrounding the flushing tube body (1).

9. The drilling top drive flushing pipe assembly structure according to claim 8 is characterized by: The upper end surface of the sealing ring (14) is provided with an annular fifth sealing groove (15), and a sealing ring is filled in the fifth sealing groove (15); The upper end surface of the sealing ring (14) is connected to the lower end surface of the gooseneck tube (21) via a sealing ring.

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