Wellhead horizontal biasing seal assembly

Abstract

The application discloses a wellhead horizontal deviation adjusting sealing assembly and belongs to the technical field of sealing equipment for oil exploitation drilling. The sealing assembly comprises a primary packing, a self-deviation adjusting module, a secondary packing, a blowout prevention structure and an outer shell which are sequentially arranged. The self-deviation adjusting module is the core of the sealing assembly. The self-deviation adjusting module drives an internal impact component through a polished rod, utilizes a dynamic unbalanced torque generated by deviation of the polished rod and drives a main body of the sealing assembly to perform self-adaptive posture adjustment in real time, so that the polished rod is automatically tracked and corrected in horizontal deviation. The device effectively solves the problems of sealing failure and crude oil leakage caused by polished rod deviation wear. Meanwhile, the device is integrated with automatic blowout prevention functions of multi-stage sealing and instantaneous closing, has the advantages of accurate deviation adjustment, reliable sealing, safe blowout prevention, energy saving and consumption reduction and prolonged maintenance period.

Description

Technical Field

[0001] This invention relates to the field of oil well drilling sealing equipment technology, specifically to a wellhead horizontal offset sealing assembly for sealing the eccentric wellhead polished rod during oil extraction. Background Technology

[0002] In my country's northern oilfields, extreme temperature differences exist, with winter and summer temperatures varying by as much as 70 to 80 degrees Celsius. Furthermore, issues such as unbalanced pumping unit base installation and poor initial wellhead alignment frequently occur. These, coupled with unpredictable factors like geological changes and formation displacement, create a highly complex operating environment for the polished rod in rod pump production systems. Rod pump production relies on the pumping unit driving the polished rod, sucker rod string, and deep-well pump plunger in a reciprocating motion to complete the pumping action. To prevent crude oil leakage from the gap between the polished rod and the wellhead assembly, a sealing device (packing box) is typically installed on the outside of the polished rod for dynamic sealing.

[0003] However, in actual production, due to unavoidable installation errors, foundation settlement, temperature stress, equipment vibration, and other factors, the running axis of the polished rod often deviates from the ideal centerline of the wellhead sealing device, resulting in lateral or random offset. This offset leads to severe uneven wear between the polished rod and the sealing packing. On the one hand, uneven wear accelerates the wear of the packing (usually made of rubber or composite materials), leading to seal failure, oil leakage, environmental pollution, resource waste, and increased workload for subsequent cleanup and environmental treatment. On the other hand, uneven wear also damages the surface of the polished rod, and long-term operation may lead to polished rod fatigue or even breakage, causing serious production safety accidents.

[0004] To address the issue of polished rod misalignment, existing technologies typically incorporate misalignment mechanisms into the sealing device, such as ball joints, spring supports, or airbag compensation mechanisms, attempting to enable the sealing box to swing with the polished rod within a certain range. However, these traditional misalignment structures still have significant drawbacks in practical applications. For example, ball joint structures are prone to wear gaps after long-term exposure to alternating loads, leading to decreased misalignment accuracy; spring support structures may lose their compensation capability due to spring fatigue and have limited response speed; airbag structures suffer from issues related to sealing reliability, oil resistance, and temperature adaptability. Furthermore, these structures are often complex, inconvenient to maintain, and lack sufficient misalignment and correction capabilities when the polished rod experiences sudden or significant misalignment, failing to fundamentally solve problems such as short packing life, frequent oil leaks, and increased energy consumption due to increased friction caused by uneven wear.

[0005] Therefore, oilfield operators still need to conduct frequent inspections and perform regular maintenance work such as packing tightening, replacement, and polished rod alignment. This not only increases production costs and management difficulty, but also affects the stability and high production of crude oil due to frequent well shutdowns for maintenance. There is an urgent need for a new type of wellhead sealing assembly with a more reliable structure, stronger adjustment capability, adaptive ability to dynamic polished rod offset, and self-correction function to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of existing wellhead sealing assembly alignment structures and provide a wellhead horizontal alignment sealing assembly. This sealing assembly can not only effectively adapt to the horizontal deviation of the polished rod, but also achieve self-correction through the dynamic action of its internal mechanism, significantly reducing wear, extending the life of the seals, preventing crude oil leakage, and possessing an emergency blowout prevention function, thereby reducing maintenance costs and production energy consumption, and improving the safety and stability of oilfield production.

[0007] To solve the above-mentioned technical problems, the technical solution proposed in this application is as follows:

[0008] A wellhead horizontal deflection sealing assembly includes a primary packing, a self-adjusting module, a secondary packing, a blowout preventer (BOP), and a housing. The primary packing, self-adjusting module, secondary packing, and BOP are sequentially arranged and housed within the housing. The self-adjusting module includes a primary sealing housing, a secondary sealing housing, a clamp, two conical oscillators, a differential cone, two springs, a primary retaining ring, a secondary retaining ring, and two adjusting pads. The primary and secondary sealing housings are joined to form an internal sealing cavity. The clamp is fixedly fitted onto a smooth rod passing through the sealing cavity. Above; the differential cone is fixedly sleeved on the outside of the sleeve; the two conical oscillators are coaxially arranged on both sides of the axial direction of the sleeve, and the light rod passes through the central hole of the conical oscillator and is clearance-fitted with it; the two springs are coaxially sleeved on the outer periphery of the end of the corresponding conical oscillator; the two adjusting pads are respectively arranged between the end of the corresponding conical oscillator and the first-level protective ring or the second-level protective ring; the first-level protective ring is fixed to the inner wall of the first-level sealing box, and the second-level protective ring is fixed to the inner wall of the second-level sealing box.

[0009] Furthermore, the self-adjusting module also includes a displacement retaining ring and a soft seal, which are disposed at the joint between the primary sealing box and the secondary sealing box.

[0010] Further, the primary packing includes an upper pressure cap, a packing ring, an upper straightening block, an upper compression ring, a sealing assembly I, and a lower compression ring; the upper pressure cap is threadedly connected to the front cavity of the primary sealing box; the outer peripheries of the packing ring, the upper compression ring, the sealing assembly I, and the lower compression ring all abut against the inner wall of the front cavity of the primary sealing box; the packing ring is located below the upper pressure cap; the upper straightening block is located inside the packing ring and has a shoulder that cooperates with the packing ring; the front end of the upper compression ring has a recess that cooperates with the lower end of the upper straightening block, and the front end face of the upper compression ring cooperates with the packing ring; the sealing assembly I is located below the upper compression ring; the lower compression ring is located below the sealing assembly I and abuts against the bottom of the inner cavity of the front cavity of the primary sealing box.

[0011] Furthermore, the secondary packing includes sealing component II and sealing component III; sealing component II and sealing component III are arranged radially inward and outward, wherein sealing component II is located on the outer side and externally connected to the inner wall of the secondary sealing box, and sealing component III is located on the inner side of sealing component II.

[0012] Furthermore, the anti-spray structure includes an upper horizontal slip ring, a lower horizontal slip ring, a lower pressure cap, a lower pad, and spring baffles; the upper horizontal slip ring is disposed between the lower pressure cap and the bottom upper end face of the secondary sealing box; the lower horizontal slip ring is disposed between the lower pad and the bottom lower end face of the secondary sealing box; the lower pressure cap is threadedly connected to the lower pad, and a plurality of spring baffles arranged in a ring are supported on the inner wall of the lower pad.

[0013] Furthermore, the spring stop is composed of multiple spring steel sheets.

[0014] Furthermore, the outer shell includes an upper thermal insulation sealing enclosure, a lower thermal insulation sealing enclosure, an upper sealing box shell, and a lower sealing box shell; the upper and lower thermal insulation sealing enclosures together enclose an internal space for accommodating the primary packing, the self-adjusting module, the secondary packing, and the blowout preventer; the upper sealing box shell is wrapped around the outside of the upper thermal insulation sealing enclosure, and the lower sealing box shell is wrapped around the outside of the lower thermal insulation sealing enclosure.

[0015] Furthermore, the upper sealing box shell and the lower sealing box shell are fixedly connected by a connector.

[0016] Furthermore, the connector includes screws and nuts.

[0017] Furthermore, the conical oscillator includes a conical front end near the differential cone and a cylindrical end away from the differential cone; the spring is sleeved around the cylindrical end; the conical front end is clearance-fitted with the outer peripheral surface of the differential cone.

[0018] Compared with the prior art, the present invention achieves the following beneficial technical effects:

[0019] The wellhead horizontal offset sealing assembly provided in this application, through an innovative dynamic impact feedback mechanism, utilizes the reciprocating motion of the polished rod itself to drive the internal offset components, achieving adaptive tracking and real-time correction of the polished rod's lateral offset. This completely solves the problem of seal failure and crude oil leakage caused by polished rod wear. The device combines multi-stage sealing and automatic blowout prevention functions, significantly improving sealing reliability, operational safety, and the lifespan of vulnerable parts, while reducing energy consumption and maintenance costs, providing efficient and reliable technical support for high and stable oilfield production. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the wellhead horizontal offset sealing assembly of the present invention.

[0022] Figure 2 This is a three-dimensional structural cross-sectional view of the wellhead horizontal alignment sealing assembly of the present invention.

[0023] Figure 3 This is a cross-sectional view of the wellhead horizontal alignment sealing assembly of the present invention.

[0024] Figure 4 This is a cross-sectional view of the self-adjusting bias module in this invention.

[0025] The annotations in the figure are explained as follows:

[0026] 1. Upper pressure cap; 2. Packing ring; 3. Upper straightening block; 4. Upper compression ring; 5. Sealing assembly I; 6. Lower compression ring; 7. Primary sealing box; 8. Adjusting shim; 9. Conical oscillator; 10. Primary retaining ring; 11. Spring; 12. Differential cone; 13. Sleeve; 14. Secondary sealing box; 15. Soft seal; 16. Displacement retaining ring; 17. Secondary retaining ring; 18. Upper thermal insulation sealing enclosure; 19. Upper sealing box shell; 20. Lower thermal insulation sealing enclosure; 21. Lower sealing box shell; 22. Lower pressure cap; 23. Sealing assembly II; 24. Sealing assembly III; 25. Upper horizontal slip ring; 26. Lower horizontal slip ring; 27. Lower pad; 28. Spring stop; 29. ​​Screw; 30. Nut. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 4 As shown, the present invention provides a wellhead horizontal alignment sealing assembly, comprising five functional parts: a primary packing, a self-aligning module, a secondary packing, a blowout preventer, and a housing. These five parts are coaxially arranged from top to bottom along the axial direction of the polished rod and are ultimately all housed and encapsulated within the overall structure formed by the housing.

[0029] The self-adjusting bias module is a key component in realizing the core functionality of this invention. Please refer to [link / reference]. Figure 1 and Figure 3 This module mainly comprises the following components: a primary sealing housing 7, a secondary sealing housing 14, a clamp 13, two conical oscillators 9, a differential cone 12, two springs 11, a primary retaining ring 10, a secondary retaining ring 17, and two adjusting pads 8. Specifically, the primary sealing housing 7 and the secondary sealing housing 14 are typically cylindrical structures, connected by flanges at their ends and fasteners such as bolts, thus forming a complete, sealed internal cavity. The clamp 13 is a metal ring-shaped part, whose inner hole is fixedly connected to the sucker rod passing through the aforementioned sealing cavity by means of interference fit, key connection, or set screw, ensuring that the clamp 13 can move synchronously with the sucker rod. The differential cone 12 is a ring-shaped part with an outer conical surface, which is fixedly fitted onto the outer cylindrical surface of the clamp 13 by means of interference fit, thus forming a rigid moving whole with the clamp 13 and the sucker rod.

[0030] Two conical oscillators 9 are coaxially arranged on both sides of the sleeve 13. The guide rod passes through the central through hole of the two conical oscillators 9 in sequence. The diameter of the central through hole is slightly larger than the diameter of the guide rod, so that a clearance fit is formed between the guide rod and the conical oscillator 9. This means that when the guide rod moves, the conical oscillator 9 does not move synchronously with the guide rod. Two springs 11 are coaxially sleeved on the outer circumferential cylindrical surface of the end of the corresponding conical oscillator 9. Two adjusting pads 8 are respectively arranged at the end face of the corresponding conical oscillator 9; specifically, the upper adjusting pad 8 is located between the end of the upper conical oscillator 9 and the first-level protective ring 10, and the lower adjusting pad 8 is located between the end of the lower conical oscillator 9 and the second-level protective ring 17. The first-level protective ring 10 is fixedly installed on the inner wall of the first-level sealing box 7, and the second-level protective ring 17 is also fixed on the inner wall of the second-level sealing box 14.

[0031] The working principle of this invention is as follows:

[0032] When the polished rod experiences a static tilt relative to the wellhead centerline due to installation errors, foundation settlement, or other reasons, the sleeve 13 fixed to the polished rod and the differential cone 12 rigidly connected to it also tilt and shift with the polished rod. During the pumping unit's drive of the polished rod in its up-and-down reciprocating motion, due to the certain gap between the inner holes of the two conical oscillators 9 and the polished rod, they are not completely synchronously tilted with the polished rod. Instead, they are perpendicular to the wellhead due to gravity. At the moment the polished rod reverses direction or accelerates / decelerates, the conical oscillators 9 will return to their original position (perpendicular to the wellhead) due to gravity and other factors, resulting in a slight relative displacement with the polished rod. This causes their conical front end to periodically contact or impact the outer conical surface of the fixed differential cone 12. The taper of the differential cone 12 is preferably a 7:24 cone angle, which provides anti-locking characteristics.

[0033] The force generated by this periodic impact is transmitted through the differential cone 12. Since the differential cone 12 and the sleeve 13, as a whole, are inclined relative to the center of the cavity formed by the primary sealing housing 7 and the secondary sealing housing 14, the point of application of the impact force deviates from the geometric center of the sealing housing. This eccentric impact force, acting on the primary and secondary retaining rings 10 and 17 fixed thereto through the adjusting pad 8 and the spring 11, generates an overturning moment. This moment forces the primary and secondary sealing housings 7 and 14, connected by a flexible joint, to undergo a small, overall deflection. The direction of this deflection is precisely to bring the center of the sealing housing cavity closer to the actual operating axis of the guide rod, thereby reducing the original tilt angle.

[0034] The aforementioned process of "impact - torque generation - attitude fine-tuning - eccentricity reduction" is dynamically and cyclically performed in each reciprocating stroke of the polished rod. The system forms a negative feedback closed loop: the larger the tilt angle, the greater the dynamic adjustment torque generated; as the attitude is adjusted, the tilt angle decreases, and the adjustment torque weakens accordingly. Ultimately, the system dynamically balances at the minimum tilt angle and near-zero adjustment torque. At this point, the axis of the entire self-adjusting module (i.e., the core sealing cavity) can adaptively track and align with the actual operating axis of the polished rod, thereby achieving efficient and automatic horizontal self-adjustment and self-correction, thus eliminating wear between the polished rod and the sealing assembly.

[0035] In a preferred embodiment, the self-adjusting module further includes a displacement retaining ring 16 and a soft seal 15. Figure 1 and Figure 3 As shown, the displacement retaining ring 16 and the soft seal 15 are disposed between the mating flange faces of the primary sealing housing 7 and the secondary sealing housing 14. The displacement retaining ring 16 is used to precisely limit the axial relative position of the two housings after mating. The soft seal 15 can be an O-ring, flexible graphite spiral wound gasket, or other elastic sealing material. Its function is to ensure the sealing at the interface between the two sealing housings while allowing the primary sealing housing 7 to undergo a slight angular deflection or translation relative to the secondary sealing housing 14 around the mating point. This "flexible connection" or "soft connection" is a necessary structural condition for enabling the entire self-adjusting module to adjust its attitude in the above working principle.

[0036] The primary packing is positioned above the self-adjusting module and primarily serves as the first sealing layer. Specifically, it includes an upper pressure cap 1, a packing ring 2, an upper straightening block 3, an upper compression ring 4, a sealing assembly Ⅰ5, and a lower compression ring 6. The upper pressure cap 1 is screwed onto the external thread on the upper part of the primary sealing housing 7 via its inner thread, forming the uppermost cap. The packing ring 2 is positioned below the upper pressure cap 1. The upper straightening block 3 is nested within the internal cavity of the packing ring 2, and its outer side is machined with a radially protruding annular shoulder. This shoulder engages with a corresponding annular groove or step on the inner wall of the packing ring 2 to achieve radial positioning of the upper straightening block 3. The upper end face of the upper compression ring 4 directly contacts the lower end face of the packing ring 2; simultaneously, the front end of the upper compression ring 4 is machined with an inwardly contracting annular recess, the shape of which matches the lower outer edge of the upper straightening block 3, allowing the two to fit together. The sealing assembly I5 is composed of multiple conventional packing rings stacked together and is positioned below the upper extrusion ring 4. The lower extrusion ring 6 is positioned below the sealing assembly I5.

[0037] During assembly, tightening the upper pressure cap 1 transmits pressure through the packing ring 2 and the upper compression ring 4, ultimately causing the lower end face of the lower compression ring 6 to tightly abut against the bottom of the inner cavity of the front chamber of the primary sealing housing 7, thereby axially compressing the sealing assembly I5 to form an effective seal. Furthermore, the outer cylindrical surfaces of the packing ring 2, the upper compression ring 4, the sealing assembly I5, and the lower compression ring 6 all maintain tight radial contact with the smooth inner wall of the front chamber of the primary sealing housing 7, achieving radial positioning and auxiliary sealing of these components within the cavity.

[0038] The secondary packing is located below the self-adjusting module to provide enhanced sealing. It includes sealing assembly II 23 and sealing assembly III 24. These two sets of sealing assemblies are arranged in a radially nested configuration. Specifically, sealing assembly II 23 is located on the outer side, with its outer wall directly abutting and externally connected to the inner wall of the secondary sealing housing 14; sealing assembly III 24 is located on the inner side of sealing assembly II 23. This double-layered radial sealing structure complements the axially compressed primary packing, together constructing a more reliable multi-layered sealing defense.

[0039] The blowout preventer is located at the bottom of the entire sealing assembly and integrates guiding and emergency sealing functions. It includes an upper horizontal slip ring 25, a lower horizontal slip ring 26, a lower pressure cap 22, a lower pad 27, and spring baffles 28. The upper horizontal slip ring 25 is positioned between the top of the inner cavity of the lower pressure cap 22 and the upper bottom surface of the secondary sealing housing 14. The lower horizontal slip ring 26 is positioned between the upper surface of the lower pad 27 and the lower bottom surface of the secondary sealing housing 14. The lower pressure cap 22 is screwed into the lower pad 27 via its internal thread and into the external thread in the central area of ​​the lower pad 27. When the lower pressure cap 22 is tightened, the lower pad 27, lower horizontal slip ring 26, and upper horizontal slip ring 25 are sequentially pressed from bottom to top, thereby axially fixing these components as a whole. Multiple spring baffles 28 are arranged in a ring array and supported by their outer edges or bottoms in the annular steps or grooves on the inner wall of the lower pad 27.

[0040] The spring baffle 28 is composed of multiple thin, elastic spring steel sheets. These steel sheets are arranged in a ring, and in their natural state, their inner edges form a through hole that allows the polished rod to pass through. During normal operation of the polished rod, the inner edges of the steel sheets contact the rod, scraping off the wax and viscous oil on the rod. When the polished rod breaks off and is pulled out, the unsupported spring steel sheets instantly spring back towards the center under their own elastic force, and the inner edges of each steel sheet overlap to form a closed metal sealing surface, quickly sealing the wellhead and achieving automatic blowout prevention.

[0041] The outer shell provides insulation, protection, and structural support for the entire device. It includes an upper insulated sealing enclosure 18, a lower insulated sealing enclosure 20, an upper sealed outer casing 19, and a lower sealed outer casing 21. The upper and lower insulated sealing enclosures 18 and 20 are typically made of insulation materials such as polyurethane, and are joined together to form a sealed, insulated space that directly accommodates all internal components of the aforementioned primary packing, self-aligning module, secondary packing, and blowout preventer structure. The upper and lower sealed outer casings 19 and 21 are metal structures that serve as external protective layers, respectively wrapping around and fixing to the outside of the upper and lower insulated sealing enclosures 18 and 20. The upper and lower sealed outer casings 19 and 21 are fixedly connected by connectors to form a robust, integrated outer shell.

[0042] The connector specifically includes a screw 29 and a mating nut 30. For example... Figure 3 As shown, this application uses multiple sets of screws 29 and nuts 30 to fasten the upper sealing box housing 19 and the flange edge of the lower sealing box housing 21 together. For comparison, Figure 3 Screw 29 and nut 30 on the upper middle side Figure 3 omitted.

[0043] Preferably, the conical oscillator 9 has a special shape, with one end near the differential cone 12 machined into a conical front end and the other end away from the differential cone 12 being a cylindrical end. The spring 11 is sleeved around the cylindrical end. A certain radial gap is maintained between the conical surface of the conical front end and the outer conical surface of the differential cone 12, forming a clearance fit. This clearance fit is a necessary condition for achieving periodic contact or impact between the conical oscillator 9 and the differential cone 12 during the reciprocating motion of the rod.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wellhead horizontal alignment sealing assembly, characterized in that, Includes primary packing, self-aligning module, secondary packing, blowout preventer and housing; The primary packing, self-adjusting module, secondary packing, and blowout preventer are arranged sequentially and housed inside the outer casing. The self-adjusting module includes a primary sealing box (7), a secondary sealing box (14), a sleeve (13), two conical oscillators (9), a differential cone (12), two springs (11), a primary guard ring (10), a secondary guard ring (17), and two adjusting pads (8). The primary sealing box (7) and the secondary sealing box (14) are joined to form an internal sealing cavity; The sleeve (13) is fixedly sleeved on the light rod that passes through the sealed cavity; The differential cone (12) is fixedly sleeved on the outside of the sleeve (13); The two conical oscillators (9) are coaxially arranged on both sides of the sleeve (13), and the light rod passes through the central hole of the conical oscillator (9) and is clearance-fitted with it; The two springs (11) are respectively coaxially sleeved on the outer periphery of the end of the corresponding conical oscillator (9); The two adjustment pads (8) are respectively disposed between the end of the corresponding conical oscillator (9) and the primary guard ring (10) or the secondary guard ring (17); The primary protective ring (10) is fixed to the inner wall of the primary sealing box (7), and the secondary protective ring (17) is fixed to the inner wall of the secondary sealing box (14).

2. The wellhead horizontal biasing seal assembly of claim 1, wherein, The self-adjusting module also includes a displacement retainer (16) and a soft seal (15), which are located at the junction of the primary sealing box (7) and the secondary sealing box (14).

3. The wellhead horizontal biasing seal assembly of claim 1, wherein, The primary packing includes an upper pressure cap (1), a packing ring (2), an upper straightening block (3), an upper compression ring (4), a sealing assembly I (5), and a lower compression ring (6); the upper pressure cap (1) is threadedly connected to the front cavity of the primary sealing box (7); the outer peripheries of the packing ring (2), the upper compression ring (4), the sealing assembly I (5), and the lower compression ring (6) all abut against the inner wall of the front cavity of the primary sealing box (7); the packing ring (2) is located below the upper pressure cap (1); the upper straightening block (3) The upper extrusion ring (4) is provided inside the packing ring (2) and has a shoulder that cooperates with the packing ring (2); the front end of the upper extrusion ring (4) is provided with a recess, which cooperates with the lower end of the upper straightening block (3), and the front end face of the upper extrusion ring (4) cooperates with the packing ring (2); the sealing assembly I (5) is provided below the upper extrusion ring (4); the lower extrusion ring (6) is provided below the sealing assembly I (5) and abuts against the bottom of the inner cavity of the front cavity of the primary sealing box (7).

4. The wellhead horizontal biasing seal assembly of claim 1, wherein, The secondary packing includes sealing component II (23) and sealing component III (24); sealing component II (23) and sealing component III (24) are arranged radially inward and outward, wherein sealing component II (23) is located on the outer side and externally connected to the inner wall of the secondary sealing box (14), and sealing component III (24) is located on the inner side of sealing component II (23).

5. The wellhead horizontal trim seal assembly of claim 1, wherein, The anti-spray structure includes an upper horizontal slip ring (25), a lower horizontal slip ring (26), a lower pressure cap (22), a lower pad (27), and spring baffles (28); the upper horizontal slip ring (25) is disposed between the lower pressure cap (22) and the bottom upper end face of the secondary sealing box (14); the lower horizontal slip ring (26) is disposed between the lower pad (27) and the bottom lower end face of the secondary sealing box (14); the lower pressure cap (22) is threadedly connected to the lower pad (27), and a plurality of spring baffles (28) arranged in a ring are supported on the inner wall of the lower pad (27).

6. The wellhead horizontal trim seal assembly of claim 5, wherein, The spring stop (28) is composed of multiple spring steel sheets.

7. The wellhead horizontal alignment sealing assembly according to claim 1, characterized in that, The outer shell includes an upper thermal insulation sealing enclosure (18), a lower thermal insulation sealing enclosure (20), an upper sealing box shell (19), and a lower sealing box shell (21); the upper thermal insulation sealing enclosure (18) and the lower thermal insulation sealing enclosure (20) together enclose an internal space for accommodating the primary packing, self-adjusting module, secondary packing, and blowout prevention structure; the upper sealing box shell (19) is wrapped around the outside of the upper thermal insulation sealing enclosure (18), and the lower sealing box shell (21) is wrapped around the outside of the lower thermal insulation sealing enclosure (20).

8. The wellhead horizontal trim seal assembly of claim 7, wherein, The upper sealing box shell (19) and the lower sealing box shell (21) are fixedly connected by connectors.

9. The wellhead horizontal trim seal assembly of claim 8, wherein, The connector includes a screw (29) and a nut (30).

10. The wellhead horizontal trim seal assembly of claim 1, wherein, The conical oscillator (9) includes a conical front end near the differential cone (12) and a cylindrical end away from the differential cone (12); the spring (11) is sleeved on the periphery of the cylindrical end; the conical front end is clearance-fitted with the outer peripheral surface of the differential cone (12).

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