Washing pipe sealing assembly and petroleum and natural gas drilling device

Abstract

The utility model discloses a wash pipe sealing assembly and a petroleum and natural gas drilling device. The washing pipe sealing assembly comprises a pressing cap, a static ring assembly, an elastic piece and a movable ring assembly, the pressing cap is used for being connected with a gooseneck pipe, the static ring assembly is movably connected with the pressing cap, the two elastic ends of the elastic piece abut against the pressing cap and the static ring assembly respectively so that the static ring assembly can elastically move relative to the pressing cap, and the movable ring assembly is used for being connected with a central pipe and rotating along with the central pipe. The static ring assembly can abut against or be separated from the moving ring assembly in a sealed mode through elastic movement. By means of the design, during installation, the static ring assembly can move to the position where the static ring assembly is separated from the movable ring assembly, and after the static ring assembly and the movable ring assembly are installed on the gooseneck pipe and the center pipe respectively, the static ring assembly elastically moves to the position where the static ring assembly abuts against the movable ring assembly in a sealed mode so that the movable ring assembly and the static ring assembly can abut against each other and are fixed. In this way, a larger assembling space can be obtained in the assembling process, and the washing pipe sealing assembly can be disassembled, assembled and replaced conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling and workover tools, in particular to a swab seal assembly and an oil and gas drilling device. Background Art

[0002] The swab seal device is one of the important components of the oil and gas drilling and workover swivel and top drive. It is used to connect the gooseneck pipe and the central pipe that rotates relative to the gooseneck pipe, and transport the high-pressure mud output by the drilling pump to the drill bit underground. A swab device with convenient and fast installation, less maintenance time, convenient and fast seal replacement, high working pressure, and long working life is an important factor to ensure the working efficiency and operation safety of oil and gas drilling operations. The existing swab device is a traditional swab packing device. Due to reasons such as the use of hammer union method, large device weight, high operation height, and small installation space in the traditional swab packing device, and because the packing corresponding to the swab requires very high concentricity and the installation and debugging are relatively complex, there are problems such as difficult installation and seal replacement, long maintenance time, and short service life. Summary of the Utility Model

[0003] To solve the problems of difficult installation and seal replacement and long maintenance time in the prior art, the utility model provides a swab seal assembly.

[0004] A swab seal assembly provided by the present application includes a compression cap, a static ring assembly, an elastic member, and a dynamic ring assembly. The compression cap is used to connect the gooseneck pipe. The static ring assembly is movably connected to the compression cap. The two elastic ends of the elastic member respectively abut against the compression cap and the static ring assembly, so that the static ring assembly can elastically move relative to the compression cap. The dynamic ring assembly is used to connect with the central pipe and rotate with the central pipe.

[0005] Wherein, the static ring assembly can be in sealing abutment or disengagement with the dynamic ring assembly through elastic movement.

[0006] In some embodiments, the static ring assembly includes a swab, a spring seat, and an adjusting ring. The swab is movably connected to the compression cap. The spring seat is sleeved outside the swab. The adjusting ring is threadedly connected to the swab and abuts against the spring seat.

[0007] Wherein, the spring seat is used to abut against the elastic member, and the adjusting ring can rotate along the radial direction of the swab to abut against the spring seat and move.

[0008] In some embodiments, the static ring assembly further includes a guiding member. One of the spring seat and the compression cap is provided with the guiding member, and the other of the spring seat and the compression cap is provided with a guiding hole. The guiding member is inserted into the guiding hole and can reciprocally slide along the moving direction of the static ring assembly.

[0009] In some embodiments, the stationary ring assembly further includes a first abutting ring, and the first abutting ring is connected to the wash pipe;

[0010] The moving ring assembly includes a connecting member and a second abutting ring. The connecting member is used for connecting with the central pipe, and the second abutting ring is connected to the connecting member;

[0011] Wherein, the first abutting ring and the second abutting ring are arranged oppositely. When the stationary ring assembly moves relative to the gland, the first abutting ring can be in sealing abutment with or separated from the second abutting ring.

[0012] In some embodiments, the first abutting ring includes a first outer ring and a first inner ring, and the first outer ring is connected to the first inner ring;

[0013] The second abutting ring includes a second outer ring and a second inner ring, and the second outer ring is connected to the second inner ring;

[0014] Wherein, along the relative direction of the first abutting ring and the second abutting ring, the first inner ring protrudes from the first outer ring, and the second inner ring protrudes from the second outer ring.

[0015] In some embodiments, both the first inner ring and the second inner ring are made of ceramic material.

[0016] In some embodiments, the stationary ring assembly further includes a locking member. The locking member is threadedly connected to the spring seat and can selectively abut against the wash pipe in a direction perpendicular to the side surface of the wash pipe.

[0017] In some embodiments, a limiting groove is formed on the side surface of the wash pipe. The radial direction of the limiting groove is consistent with the moving direction of the wash pipe. The locking member can selectively abut against the bottom surface of the limiting groove, and the locking member can slide within a predetermined range along the radial direction of the limiting groove.

[0018] In some embodiments, a pantograph seal ring is arranged at the movable connection between the wash pipe and the gland. The pantograph seal ring is also arranged between the first abutting ring and the wash pipe and between the second abutting ring and the connecting member.

[0019] The present application also provides an oil and gas drilling device, including the above-mentioned wash pipe seal assembly.

[0020] Compared with the prior art, the beneficial effects of the flushing pipe sealing assembly according to the embodiment of the present utility model are as follows: The flushing pipe sealing assembly provided in this application includes a compression nut, a static ring assembly, an elastic member, and a dynamic ring assembly. The compression nut is used to connect the gooseneck pipe. The static ring assembly is movably connected to the compression nut. The two elastic ends of the elastic member respectively abut against the compression nut and the static ring assembly, so that the static ring assembly can elastically move relative to the compression nut. The dynamic ring assembly is used to connect to the central pipe and rotate with the central pipe. The static ring assembly can elastically move to sealingly abut against or disengage from the dynamic ring assembly. Through the above design, the static ring assembly can elastically move. During installation, the static ring assembly can be first moved to a position where it disengages from the dynamic ring assembly. After the static ring assembly and the dynamic ring assembly are respectively installed on the gooseneck pipe and the central pipe, the static ring assembly is elastically moved to a position where it sealingly abuts against the dynamic ring assembly so that the dynamic ring assembly and the static ring assembly abut and fix each other. In this way, a larger assembly space can be obtained during the assembly process, which is convenient for disassembling, installing, and replacing the flushing pipe sealing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of an embodiment of the flushing pipe sealing assembly provided in this application;

[0022] Figure 2 is a schematic sectional view of an embodiment of the flushing pipe sealing assembly provided in this application;

[0023] Figure 3 is Figure 2 an enlarged schematic view of the structure at A in

[0024] Figure 4 is Figure 2 an enlarged schematic view of the structure at B in

[0025] Figure 5 is an exploded schematic view of an embodiment of the flushing pipe sealing assembly provided in this application;

[0026] Figure 6 is another exploded schematic view of an embodiment of the flushing pipe sealing assembly provided in this application.

[0027] 100, compression nut; 11, guiding hole; 200, static ring assembly; 21, flushing pipe; 211, limiting groove; 22, spring seat; 23, adjusting ring; 24, guiding member; 25, first abutting ring; 251, first outer ring; 252, first inner ring; 26, locking member; 300, dynamic ring assembly; 31, second abutting ring; 311, second outer ring; 312, second inner ring; 32, connecting member; 400, elastic member; 500, fan-shaped seal ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is merely exemplary and explanatory, and shall not have any restrictive effect on the protection scope of the present utility model.

[0029] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this article are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0034] Such as Figure 1 、 Figure 2A flushing pipe sealing assembly as shown includes a compression nut 100, a stationary ring assembly 200, an elastic member 400, and a moving ring assembly 300. One end of the compression nut 100 is used to connect to the gooseneck pipe, and the other end is movably connected to the stationary ring assembly 200. During drilling, the mud flows through the gooseneck pipe and then through this flushing pipe sealing assembly. The two elastic ends of the elastic member 400 (the elastic member 400 can be a kind of spring) respectively abut against the compression nut 100 and the stationary ring assembly 200. Under the action of the elastic member 400, the stationary ring assembly 200 can elastically move relative to the compression nut 100. One end of the moving ring assembly 300 is in sealing abutment with the stationary ring assembly 200, and the other end is connected to the central pipe. The mud flowing through this flushing pipe sealing assembly then flows into the central pipe and is discharged. When the mud flows through this flushing pipe sealing assembly, it will generate pressure on the stationary ring assembly 200 to press the stationary ring assembly 200 against the moving ring assembly 300, so that the stationary ring assembly 200 and the moving ring assembly 300 are pressed against each other more tightly. When there is no mud flowing through, the elastic member 400 can provide a predetermined degree of elastic force for the stationary ring assembly 200, so that when there is no mud flowing through, the stationary ring assembly 200 can also be pressed against the moving ring assembly 300 with a predetermined pressure, avoiding the phenomenon that the stationary ring assembly 200 and the moving ring assembly 300 are separated when there is no mud flowing through.

[0035] Through the above design, when installing this flushing pipe sealing assembly, first move the stationary ring assembly 200 to a position where it is separated from the moving ring assembly 300. After the stationary ring assembly 200 and the moving ring assembly 300 are respectively installed on the gooseneck pipe and the central pipe, elastically move the stationary ring assembly 200 to a position where it is in sealing abutment with the moving ring assembly 300 so that the moving ring assembly 300 and the stationary ring assembly 200 are abutted and fixed to each other. In this way, a larger assembly space can be obtained during the assembly process, which is convenient for disassembling, assembling, and replacing this flushing pipe sealing assembly.

[0036] The technical details of each component will be introduced one by one below.

[0037] In some embodiments, as Figure 2 、 Figure 5 、 Figure 6 shown, the above-mentioned stationary ring assembly 200 includes a flushing pipe 21, a spring seat 22, and an adjusting ring 23. The flushing pipe 21 is movably connected to the compression nut 100. When the mud is flowing, the mud will generate pressure on the end face of the flushing pipe 21 close to the compression nut 100 to push the flushing pipe 21 against the moving ring assembly 300. The spring seat 22 is sleeved outside the flushing pipe 21 and is used to abut against the elastic member 400. The adjusting ring 23 is threadedly connected to the flushing pipe 21 and abuts against the spring seat 22. The adjusting ring 23 can rotate along the radial direction of the flushing pipe 21 to abut against the spring seat 22 and move, so as to compress or relax the elastic member 400. By the above method, the magnitude of the pressure generated by the elastic member 400 on the stationary ring assembly 200 can be changed, so that the stationary ring assembly 200 and the moving ring assembly 300 can be pressed against each other with a suitable pressure.

[0038] The above-mentioned gland 100 is provided with an embedding groove for embedding the elastic member 400. The embedding groove can prevent the elastic member 400 from shifting in position during the process of abutting against the stationary ring assembly 200 and moving, so that the elastic member 400 can always abut against the stationary ring assembly 200 evenly and stably. In this way, the abutting structure between the stationary ring assembly 200 and the moving ring assembly 300 can be made to fit more tightly.

[0039] In some embodiments, the above-mentioned stationary ring assembly 200 further includes a guiding member 24. One of the spring seat 22 and the gland 100 is provided with the guiding member 24, and the other of the spring seat 22 and the gland 100 is provided with a guiding hole 11. The guiding member 24 is inserted into the guiding hole 11 and can slide reciprocally along the moving direction of the stationary ring assembly 200.

[0040] As Figure 2 、 Figure 5 、 Figure 6 shown, the above-mentioned guiding hole 11 is opened on the gland 100, and the above-mentioned guiding member 24 is arranged on the spring seat 22. Of course, the guiding hole 11 can also be opened on the spring seat 22, and the guiding member 24 is arranged on the gland 100. On the one hand, the guiding member 24 can play a guiding role during the movement of the spring seat 22. On the other hand, it can prevent the spring seat 22 from rotating together with the adjusting ring 23 and causing the elastic member 400 to shift, ensuring that the elastic member 400 can abut against the stationary ring assembly 200 evenly and stably.

[0041] In some embodiments, as Figure 2 、 Figure 5 、 Figure 6 shown, the above-mentioned stationary ring assembly 200 further includes a first abutting ring 25. The first abutting ring 25 and the above-mentioned wash pipe 21 can be detachably connected by means of clamping, screwing, fitting, magnetic attraction, etc., so that the first abutting ring 25 can be very conveniently detached from the wash pipe 21.

[0042] Please refer to Figure 2 again. The above-mentioned moving ring assembly 300 includes a connecting member 32 and a second abutting ring 31. The connecting member 32 is used to connect the moving ring assembly 300 to the central pipe. The second abutting ring 31 can be detachably connected to the connecting member 32 by means of clamping, screwing, fitting, magnetic attraction, etc., so that the second abutting ring 31 can be very conveniently detached from the connecting member 32.

[0043] Please refer to Figure 2, the above-mentioned first abutting ring 25 and second abutting ring 31 are arranged opposite to each other. When the stationary ring assembly 200 moves relative to the gland nut 100, the first abutting ring 25 can be in sealing abutment with or disengaged from the second abutting ring 31. Through the above design, when the sealing performance of the swage tube seal assembly is damaged due to wear, only the first abutting ring 25 and the second abutting ring 31 need to be replaced, without replacing the entire stationary ring assembly 200 and the rotating ring assembly 300, which greatly reduces the cost required for replacing the swage tube seal assembly and extends the service life of some components of the swage tube seal assembly.

[0044] In practical applications, in order to prevent the first abutting ring 25 from rotating relative to the swage tube 21, a fastening screw is provided between the first abutting ring 25 and the swage tube. The fastening screw can connect the first abutting ring 25 and the swage tube 21 together and prevent the first abutting ring 25 and the swage tube 21 from rotating relative to each other, which may have an adverse effect on the sealing performance of the swage tube seal assembly. Similarly, in order to prevent the second abutting ring 31 from rotating relative to the connecting member 32, a fastening screw is also provided between the second abutting ring 31 and the connecting member 32 to connect the second abutting ring 31 and the connecting member 32 together and prevent the second abutting ring 31 and the connecting member 32 from rotating relative to each other, which may have an adverse effect on the sealing performance of the swage tube seal assembly.

[0045] In some embodiments, such as Figure 2 , Figure 5 , Figure 6 shown, the above-mentioned first abutting ring 25 includes a first outer ring 251 and a first inner ring 252, and the first outer ring 251 and the first inner ring 252 can be fixedly connected to each other by integral injection molding, snap-fitting, or fitting; the above-mentioned second abutting ring 31 includes a second outer ring 311 and a second inner ring 312, and the second outer ring 311 and the second inner ring 312 can be fixedly connected to each other by integral injection molding, snap-fitting, or fitting. Along the relative direction of the first abutting ring 25 and the second abutting ring 31, the above-mentioned first inner ring 252 protrudes from the first outer ring 251, and the above-mentioned second inner ring 312 protrudes from the second outer ring 311.

[0046] It can be understood that driven by the central tube, the first abutting ring 25 and the second abutting ring 31 will rub against each other. During the rubbing process, the abutting surfaces of the first abutting ring 25 and the second abutting ring 31 will be worn and consumed. Through the above design that along the relative direction of the first abutting ring 25 and the second abutting ring 31, the above-mentioned first inner ring 252 protrudes from the first outer ring 251, and the above-mentioned second inner ring 312 protrudes from the second outer ring 311, the time of wear and consumption can be extended. At the same time, it is also possible to judge whether the first abutting ring 25 and the second abutting ring 31 need to be replaced by observing the distance between the first outer ring 251 and the second outer ring 311.

[0047] In some embodiments, both the first inner ring 252 and the second inner ring 312 are made of ceramic material. It can be understood that the ceramic material is not only delicate and smooth, with good fitting and sealing properties, but also has high hardness and good wear resistance, which can greatly extend the service life of the first abutting ring 25 and the second abutting ring 31, and thus improve the service life of the swage seal assembly.

[0048] In some embodiments, such as Figure 2 , Figure 5 , Figure 6 shown, the stationary ring assembly 200 further includes a locking member 26, which is threadedly connected to the spring seat 22. The locking member 26 can reciprocate by rotating in a direction perpendicular to the outer side surface of the swage 21, and can also be tightened and fixed against the outer side surface of the swage 21. After the swage seal assembly is installed, in order to prevent the adjusting ring 23 from moving due to vibration or other factors during use, which may cause a change in the pressure of the elastic member 400 on the stationary ring assembly 200, the locking member 26 can fix the spring seat 22 on the outer side surface of the swage 21 by being tightened and fixed against the outer side surface of the swage 21. In this way, the spring seat 22 can be prevented from moving with the adjusting ring 23, and thus the pressure generated by the elastic member 400 on the stationary ring assembly 200 can be effectively stabilized.

[0049] In some embodiments, such as Figure 2 , Figure 5 , Figure 6 shown, a limiting groove 211 is formed on the side surface of the swage 21. The radial direction of the limiting groove 211 is consistent with the moving direction of the swage 21. The locking member 26 can selectively abut against the limiting groove 211, and the locking member 26 can slide within a predetermined range along the radial direction of the limiting groove 211. When the locking member 26 is inserted into the limiting groove 211, since the locking member 26 can only slide within a predetermined range along the radial direction of the limiting groove 211, the moving range of the swage 21 is also restricted. In this way, it can be prevented that the swage 21 slides relative to the compression cap 100 excessively and causes the swage 21 to disengage from the compression cap 100. If the swage 21 disengages from the compression cap 100, it will cause mud leakage and trigger an accident. Therefore, the cooperation between the locking member 26 and the limiting groove 211 can effectively ensure the safety and stability of the swage seal assembly during use.

[0050] In some embodiments, such as Figure 2 , Figure 3 , Figure 4As shown in the figure, a pantograph seal ring 500 is provided at the movable connection between the flushing pipe 21 and the compression cap 100 (it should be noted that the pantograph seal ring 500 is a high-performance seal with a U-shaped Teflon inner special spring. With appropriate spring force plus system fluid pressure, the sealing lip / surface is pushed out to gently press against the sealed metal surface to generate a very excellent sealing effect. The pantograph seal ring 500 has the actuation effect of the spring, which can overcome the slight eccentricity of the metal mating surface and the wear of the sealing lip, and continuously maintain the expected sealing performance). Pantograph seal rings 500 are provided between the first abutting ring 25 and the flushing pipe 21, and between the second abutting ring 31 and the connecting member 32.

[0051] In practical applications, due to the influence of machining errors, the non-coaxiality of the flushing pipe 21, the moving ring assembly 300, and the static ring assembly 200, and when the central pipe connected by the connecting member 32 moves or swings in a direction deviating from the axis due to vibration or other reasons, because the pantograph seal ring 500 has the actuation effect of the spring, it can overcome the slight eccentricity of the metal mating surface and the wear of the sealing lip, so that the static ring assembly 200 and the moving ring assembly 300 can still maintain close fit and maintain the sealing integrity between the two, greatly reducing the difficulty of the installation and commissioning process of the flushing pipe seal assembly.

[0052] This application also proposes an oil and gas drilling device, which includes the above-mentioned flushing pipe seal assembly.

[0053] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0055] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A flushing pipe sealing assembly, characterized in that, Comprising: A compression cap (100) for connecting a gooseneck tube; A stationary ring assembly (200) movably connected to the compression cap (100); An elastic member (400) with its elastic ends respectively abutting against the compression cap (100) and the stationary ring assembly (200) so that the stationary ring assembly (200) can elastically move relative to the compression cap (100); A rotating ring assembly (300) for connecting to a central tube and rotating with the central tube; Wherein, the stationary ring assembly (200) can be in sealing abutment or separation from the rotating ring assembly (300) through elastic movement; 2. The flushing tube sealing assembly according to claim 1, wherein The stationary ring assembly (200) includes a flush tube (21), a spring seat (22), and an adjusting ring (23). The flush tube (21) is movably connected to the compression cap (100). The spring seat (22) is sleeved outside the flush tube (21). The adjusting ring (23) is threadedly connected to the flush tube (21) and abuts against the spring seat (22); Wherein, the spring seat (22) is used to abut against the elastic member (400), and the adjusting ring (23) can rotate to radially abut against the spring seat (22) along the flush tube (21) and move; 3. The flushing tube sealing assembly according to claim 2, wherein, The stationary ring assembly (200) further includes a guiding member (24). One of the spring seat (22) and the compression cap (100) is provided with the guiding member (24), and the other of the spring seat (22) and the compression cap (100) is provided with a guiding hole (11). The guiding member (24) is inserted into the guiding hole (11) and can reciprocally slide along the movement direction of the stationary ring assembly (200); 4. The flushing tube sealing assembly according to claim 2, wherein The stationary ring assembly (200) further includes a first abutting ring (25) connected to the flush tube (21); The rotating ring assembly (300) includes a connecting member (32) for connecting to a central tube and a second abutting ring (31) connected to the connecting member (32); Wherein, the first abutting ring (25) and the second abutting ring (31) are oppositely arranged. When the stationary ring assembly (200) moves relative to the compression cap (100), the first abutting ring (25) can be in sealing abutment or separation from the second abutting ring (31); 5. The flushing tube sealing assembly according to claim 4, wherein The first abutting ring (25) includes a first outer ring (251) and a first inner ring (252) connected to each other; The second abutting ring (31) includes a second outer ring (311) and a second inner ring (312) connected to each other; Wherein, along the relative direction of the first abutting ring and the second abutting ring, the first inner ring (252) protrudes from the first outer ring (251), and the second inner ring (312) protrudes from the second outer ring (311); 6. The flushing tube sealing assembly according to claim 5, wherein, Both the first inner ring (252) and the second inner ring (312) are made of ceramic material.

7. The flushing tube sealing assembly according to claim 2, wherein, The stationary ring assembly (200) further includes a locking member (26), which is threadedly connected to the spring seat (22) and can selectively press against the washpipe (21) in a direction perpendicular to the side surface of the washpipe (21).

8. The flushing tube sealing assembly according to claim 7, wherein, A limiting groove (211) is formed on the side surface of the washpipe (21). The radial direction of the limiting groove (211) is consistent with the moving direction of the washpipe (21). The locking member (26) can selectively press against the bottom surface of the limiting groove (211), and the locking member (26) can slide within a predetermined range along the radial direction of the limiting groove (211).

9. The flushing tube sealing assembly according to claim 4, wherein, A pantograph seal ring (500) is provided at the movable connection between the washpipe (21) and the compression cap (100). The pantograph seal ring (500) is also provided between the first abutting ring (25) and the washpipe (21), and between the second abutting ring (31) and the connecting member (32).

10. An oil and gas drilling device, characterized in that, It includes the washpipe seal assembly described in any one of claims 1 to 9.

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