A large-diameter tubing hanger for use with a tubing head spool and method of use

Abstract

The application discloses a large-diameter tubing hanger suitable for tubing head four-way use and a use method, relates to the technical field of oil exploitation instruments, and discloses a large-diameter tubing hanger suitable for tubing head four-way use, which comprises a tubing four-way head, a tubing hanger head for tubing sealing is longitudinally arranged in the tubing four-way head, and a supporting frame is fixed on the outside of the tubing four-way head through a mounting support; a booster assembly for external connection of a gas pump is arranged on the supporting frame, the booster assembly comprises a three-way valve arranged on the outside of the supporting frame, and an excitation assembly for tubing hanger head sealing is arranged in the supporting frame; an excitation hole is arranged on the tubing four-way head close to the tubing hanger head, and a trigger assembly matched with the excitation assembly is arranged on the tubing hanger head. The application adopts a pneumatic abutting mode, eleven jacks are used to realize efficient excitation sealing of the tubing hanger head, and longitudinal trigger sealing and stress offsetting are simultaneously completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil extraction equipment, and particularly relates to a large-diameter tubing hanger for adapting to a tubing head four-way cross and a use method. BACKGROUND

[0002] The tubing hanger is a key device for suspending the weight of the tubing string in the oil and gas well and preventing it from falling, and the core function thereof is to seal the annular space between the tubing and the casing to isolate the formation pressure from the wellhead equipment. Generally, the tubing hanger is adapted to be installed in the tubing four-way cross head for subsequent sealing and suspension of the tubing.

[0003] In the process of installing the tubing hanger in the tubing four-way cross head, the metal sealing position of the conventional size tubing hanger and the tubing four-way cross body is at the lower end of the body, and the installation process is prone to bruising, deformation and damage, and it is difficult to replace after damage. The large-diameter tubing hanger puts forward higher requirements for installation convenience, sealing safety and reliability. For the metal sealing excitation mode, such as the design of the screwing jack rod with screw threads, manual excitation is performed, and since a large number of screwing jack rods are required, manual screwing is high in intensity and long in time, not to mention that it is easy to appear the phenomenon of screwing excitation error, screwing excitation out of place, which leads to the sealing out of place, affects the stability of the subsequent tubing, and causes safety hazards. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above and / or existing problems in the large-diameter tubing hanger for adapting to the tubing head four-way cross and the use method, the present application is proposed.

[0006] Therefore, the problem to be solved by the present application is how to change the lower metal sealing position of the conventional size tubing hanger and the tubing four-way cross body to the upper metal sealing position, realize the sealing safety and reliability, and how to solve the problem of synchronous completion of longitudinal trigger sealing and stress offset under the condition of high-efficiency excitation sealing of the tubing hanger by eleven jacks through the pneumatic abutting mode.

[0007] To solve the above technical problems, the present application provides the following technical solutions: A large-diameter tubing hanger suitable for tubing head four-way use, comprising a tubing four-way head, a tubing hanger head is longitudinally arranged in the tubing four-way head for tubing sealing, and a supporting bracket is fixed on the outside of the tubing four-way head through a mounting support; a booster assembly for external air pump pressure activation is arranged on the supporting bracket, and a three-way valve is arranged on the outside of the supporting bracket, and a trigger assembly for tubing hanger head sealing is arranged in the supporting bracket; a trigger hole is arranged in the tubing four-way head close to the tubing hanger head, and bolt reserved holes are staggered distributed on the tubing four-way head, and a trigger assembly matched with the trigger assembly is arranged on the tubing hanger head, and a clamping spring is clamped on the tubing hanger head.

[0008] As a preferred scheme of the large-diameter tubing hanger suitable for tubing head four-way use and the use method, the booster assembly further comprises a connecting end connected to the front end of the three-way valve, and an internal screw is connected to the pressure port of the external air pump, and the top end of the three-way valve is connected to a booster end, and the booster end is connected to a main cylinder body connected to the supporting bracket.

[0009] As a preferred scheme of the large-diameter tubing hanger suitable for tubing head four-way use and the use method, the outer end of the main cylinder body is connected to a secondary cylinder body through booster pipes of different lengths, and the main cylinder body and the secondary cylinder body are connected to the supporting bracket, and the head ends of the main cylinder body and the secondary cylinder body are provided with airtight pressure accumulation spaces, and the bottom end of the three-way valve is connected to a pressure relief end.

[0010] As a preferred scheme of the large-diameter tubing hanger suitable for tubing head four-way use and the use method, the trigger assembly further comprises a sliding cavity arranged in the supporting bracket close to the inside of the trigger hole, a reset spring is embedded in the pressure accumulation spaces of the main cylinder body and the secondary cylinder body, and the inner end of the reset spring is fixed with a workpiece sliding in the sliding cavity.

[0011] As a preferred scheme of the large-diameter tubing hanger suitable for tubing head four-way use and the use method, the inner side of the workpiece is sleeved with a trigger rod penetrating the trigger hole, a top pressure head designed in a circular truncated cone shape is arranged on the inner side of the trigger rod, and an elastic block is arranged between the workpiece and the trigger rod.

[0012] As a preferred scheme of the large-diameter tubing hanger suitable for tubing head four-way use and the use method, the trigger assembly further comprises an upper metal sealing ring and a lower metal sealing ring sliding close to the clamping spring on the tubing four-way head, and the upper metal sealing ring and the lower metal sealing ring are designed in a circular truncated cone shape and slide inwardly, and a pressing ring sliding with the tubing four-way head is fixed on the upper metal sealing ring.

[0013] As a preferred solution of the large-diameter tubing hanger and method for use of the tubing head adapter cross, wherein: the upper metal sealing ring and the pressing ring are fixed with the elastic ring sliding with the tubing cross head, and the upper sealing ring is sleeved outside the elastic ring, and the upper edge of the lower metal sealing ring is sleeved with the lower sealing ring.

[0014] As a preferred solution of the large-diameter tubing hanger and method for use of the tubing head adapter cross, wherein: the lower metal sealing ring is sleeved with the expansion ring outside, and is below the lower sealing ring, and the expansion ring is sleeved with the restraint ring outside, and the restraint ring is sleeved with the stop ring fixed with the lower edge of the lower metal sealing ring outside.

[0015] As a preferred solution of the large-diameter tubing hanger and method for use of the tubing head adapter cross, wherein: the upper part of the tubing cross head is annularly provided with a sealing groove from top to bottom, and the upper FS sealing ring and the lower FS sealing ring are sleeved in the two groups of sealing grooves and staggered with the upper metal sealing ring and the lower metal sealing ring.

[0016] A method for using a large-diameter tubing hanger for use of a tubing head adapter cross, comprising the following steps:

[0017] Step one: first, the gas source of the external air pump pressure port is connected to the main cylinder through the connecting end and the booster end of the three-way valve, and then to the plurality of auxiliary cylinders through the plurality of booster pipes with different lengths;

[0018] Step two: under the action of the boosting pressure, the workpiece drives the excitation rod to slide synchronously and inwardly in the excitation hole, and the pressure head forces the upper metal sealing ring on the pressure ring to stop the excitation, and the pneumatic excitation sealing work is completed;

[0019] Step three: at the same time, the pressure ring forces the upper metal sealing ring to slide downward on the outer wall of the tubing hanger toward the lower metal sealing ring, and also forces the elastic ring to be pressed downward and to be elastically contracted, and then drives the upper sealing ring to be moved downward and to be clamped in the lower sealing ring, and triggers the longitudinal sealing of the annular space between the upper metal sealing ring and the lower metal sealing ring which slides downward.

[0020] Step four: during this period, the lower metal sealing ring is subjected to the transverse extrusion force generated by the sliding of the upper metal sealing ring, forcing the expansion ring inside to expand and stretch outwardly and tightly adhere to the inner wall of the restraint ring, forming an annular closed space, and completing the expansion and restraint sealing work.

[0021] The application has the advantages that: through the booster assembly and the excitation assembly, the gas dynamic abutting mode is adopted, the efficient excitation sealing effect is realized on the tubing hanger head through the transverse root rod, the manual screw excitation mode is replaced, the operation is convenient and fast, the fault tolerance is low, the precision is high, through the trigger assembly, the longitudinal sealing effect is realized on the tubing hanger head based on the secondary trigger mechanism, the double sealing effect in the transverse and longitudinal directions is realized, the generated extrusion stress is bound and offset, the safety hidden danger caused by the insufficient sealing of the annular space of the tubing hanger head is prevented, and safety and reliability are realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A scene diagram of a large-diameter tubing hanger for adapting to a tubing head four-way.

[0024] Figure 2 A side view of the tubing hanger head, the support frame, the booster assembly, the excitation assembly and the trigger assembly.

[0025] Figure 3 A side view of the tubing four-way head and the support frame.

[0026] Figure 4 A top view of the support frame, the booster assembly and the excitation assembly.

[0027] Figure 5 A side view of the booster assembly and the excitation assembly.

[0028] Figure 6 A bottom view of the booster assembly and the excitation assembly.

[0029] Figure 7 An exploded view of the tubing hanger head and the trigger assembly.

[0030] Figure 8 An exploded view of the trigger assembly.

[0031] In the figure: 1, tubing four-way head; 2, tubing hanger; 3, mounting support; 4, support bracket; 51, three-way valve; 52, connecting end; 53, booster end; 54, main cylinder; 55, booster pipe; 56, auxiliary cylinder; 57, pressure relief end; 61, excitation hole; 62, sliding cavity; 63, return spring; 64, I-shaped piece; 65, excitation rod; 66, pressure head; 67, elastic block; 71, upper metal sealing ring; 72, lower metal sealing ring; 73, snap spring; 74, pressure ring; 75, elastic ring; 76, upper sealing ring; 77, lower sealing ring; 8, expansion ring; 9, restraint ring; 10, stop ring; 11, upper FS sealing ring; 12, lower FS sealing ring. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0033] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0034] Secondly, "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in this specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0035] Embodiment 1, refer to Figures 1-8 For the first embodiment of the present application, the embodiment provides a large-diameter tubing hanger for adapting to the tubing head four-way, comprising a tubing four-way head 1, a tubing hanger 2 is arranged longitudinally in the tubing four-way head 1 for tubing sealing, and a support bracket 4 is fixed on the outside of the tubing four-way head 1 through a mounting support 3; and the support bracket 4 is provided with a booster assembly for external air pump pressure activation, and comprises a three-way valve 51 arranged on the outside of the support bracket 4, and a pressure sensor is arranged at the inner end of the three-way valve 51 for real-time monitoring of the pressure of the pressure source flowing through the three-way valve 51, so as to prevent the pressure of the external air source from being insufficient, and to ensure that the pressure of the external air source is sufficient.

[0036] Specifically, it further comprises a connecting end 52 connected to the front end of the three-way valve 51, which is communicated with the pressure port of the external air pump by internal threads, and the top end of the three-way valve 51 is communicated with a booster end 53, and the booster end 53 is communicated with a main cylinder 54 which is communicated with the support bracket 4.

[0037] The air source of the external air pump pressing port is supplied to the pressurizing end 53 through the connecting end 52 of the three-way valve 51, reaches the main cylinder 54, and is used as the carrier space of the main cylinder 54 located in the middle of the support frame 4 to complete the preliminary supply of the air source of the external air pump pressing port.

[0038] Specifically, the outer end of the main cylinder 54 is connected to the auxiliary cylinder 56 through the long and short pressurizing pipes 55. The long and short pressurizing pipes 55 are designed in an arc shape and are staggered along the groups of auxiliary cylinders 56, and a pressure gauge is arranged on the last two auxiliary cylinders 56 to read the value and communicate with the support frame 4. The head end of the main cylinder 54 and the auxiliary cylinder 56 is provided with a sealed pressure accumulation space, and the bottom end of the three-way valve 51 is connected to the pressure relief end 57. If the pressurizing pressure supplied to the main cylinder 54 is too large or needs to be released, the three-way valve 51 is controlled to open the channel of the pressure relief end 57, and then the excessive or discharged pressurizing air source is discharged through the pressure relief end 57, thereby achieving the effects of pressure regulation and release.

[0039] The pressurizing air source reaches the auxiliary cylinders 56 through the long and short pressurizing pipes 55, and continuously pressurizes in the pressure accumulation space at the head end of the main cylinder 54 and the auxiliary cylinders 56, thereby generating a pressurizing pressure force to prepare for the subsequent sealing and activation of the tubing hanger head 2.

[0040] The support frame 4 is provided with an activation assembly for the sealing of the tubing hanger head 2, which includes an activation hole 61 arranged in the tubing cross head 1 near the tubing hanger head 2 and staggered with the bolt reserved holes thereon, and a sliding cavity 62 arranged in the support frame 4 near the inner side of the activation hole 61. A reset spring 63 is embedded in the pressure accumulation space of the main cylinder 54 and the auxiliary cylinder 56, and the inner end of the reset spring 63 is fixed with a workpiece 64 that slides in the sliding cavity 62.

[0041] Under the action of the pressurizing pressure force in the pressure accumulation space, the eleven workpieces 64 are forced to slide inward in the sliding cavity 62 in the support frame 4 synchronously, and the eleven reset springs 63 are stretched to perform synchronous action. When the pressure relief end 57 is released, the pressurizing air source in the pressure accumulation space is discharged, the eleven workpieces 64 lose the pressurizing pressure force, and are forced to slide outward under the elastic reset force of the eleven reset springs 63.

[0042] The inner side of the I-shaped piece 64 is sleeved with the excitation rods 65 penetrating the excitation holes 61, and the inner side of the excitation rods 65 is provided with the top pressing heads 66 designed in a circular truncated cone type, the number of the excitation holes 61, the excitation rods 65 and the top pressing heads 66 is eleven, and they are arranged in a two, two, three, two and two half ring embracing type along the longitudinal axis of the tubing hanger 2, so as to realize the overall excitation sealing effect of the tubing hanger 2, and the elastic blocks 67 are arranged between the I-shaped piece 64 and the excitation rods 65, so as to eliminate the extrusion stress between the I-shaped piece 64 and the excitation rods 65, and prevent the eleven excitation rods 65 from being loosened and displaced after being pressed for a long time.

[0043] The eleven I-shaped pieces 64 also drive the eleven excitation rods 65 to slide inwards in the excitation holes 61 synchronously, and force the top pressing heads 66 to press against the upper metal sealing ring 71 on the pressure ring 74 transversely, so as to excite the tubing hanger 2 in the tubing cross 1 by the eleven excitation rods 65 in the horizontal direction synchronously, and complete the pneumatic excitation sealing work.

[0044] Embodiment 2, with reference to Figures 1-8 This is the second embodiment of the present application, which is based on the previous embodiment.

[0045] Specifically, the tubing hanger 2 is provided with a trigger assembly matched with the excitation assembly, and includes the snap spring 73 clamped on the tubing hanger 2, which clamps and stops the upper edge of the upper metal sealing ring 71, so as to prevent it from sliding upwards after being stressed.

[0046] It also includes the upper metal sealing ring 71 and the lower metal sealing ring 72 sliding on the tubing cross 1 near the snap spring 73, which are designed in a circular truncated cone type and slide inwards, and the pressure ring 74 sliding with the tubing cross 1 is fixed on the upper metal sealing ring 71, which is designed in a circular truncated cone type matched with the eleven top pressing heads 66, so as to facilitate the eleven top pressing heads 66 to press and extrude the pressure ring 74 effectively, and realize the effective transmission of force.

[0047] Under the horizontal excitation force of the top pressing heads 66 on the eleven excitation rods 65, the pressure ring 74 forces the upper metal sealing ring 71 to slide downwards on the outer wall of the tubing hanger 2 towards the lower metal sealing ring 72.

[0048] Specifically, the elastic ring 75 sliding with the tubing cross 1 is fixed between the upper metal sealing ring 71 and the pressure ring 74, the upper blocking ring 76 is sleeved on the outer side of the elastic ring 75, and the lower blocking ring 77 is sleeved on the upper edge of the lower metal sealing ring 72 and clamped with the upper blocking ring 76, the inner diameter of the upper blocking ring 76 is the same as the outer diameter of the lower blocking ring 77, and after extrusion and adhesion, the lower blocking ring 77 can be completely received and hidden, and a ring-shaped whole is formed.

[0049] The upper metal sealing ring 71 that slides down also elastically contracts the elastic ring 75, and the contracted elastic ring 75 drives the upper sealing ring 76 to move down and be clamped in the lower sealing ring 77, thereby triggering longitudinal sealing of the annular space between the upper metal sealing ring 71 and the lower metal sealing ring 72 that slides down.

[0050] Embodiment 3, refer to Figures 1-8 As the third embodiment of the present application, the embodiment is based on the previous two embodiments.

[0051] Specifically, the lower metal sealing ring 72 is sleeved with the expansion ring 8 on the outside and is below the lower sealing ring 77, and the expansion ring 8 is sleeved with the restraint ring 9 on the outside, and the inner wall of the restraint ring 9 is annularly provided with an annular groove that engages with the expansion ring 8 and the lower metal sealing ring 72, so as to prevent the lower metal sealing ring 72 from being forced to stretch the expansion ring 8 to adhere to the restraint ring 9 and from being longitudinally skewed and separated, thereby limiting and preventing separation and eliminating longitudinal stress, and the restraint ring 9 is sleeved with the stop ring 10 that is fixed to the lower edge of the lower metal sealing ring 72 on the outside, and the inner diameter of the stop ring 10 is the same as the outer diameter of the restraint ring 9, so that after being extruded and adhered, the expansion ring 8 and the restraint ring 9 can be completely received and hidden, thereby sealing to form an annular whole.

[0052] The lower metal sealing ring 72 is subjected to transverse extrusion force generated by the lower sliding of the upper metal sealing ring 71, so as to force the expansion ring 8 inside to expand and stretch outward and adhere to the inner wall of the restraint ring 9, thereby forming an annular closed space, and then the expansion ring 8 and the restraint ring 9 after expansion and restraint are wrapped by the outermost stop ring 10, thereby synchronously completing the sealing work of expansion and restraint and stress elimination on the basis of the transverse and longitudinal double sealing of the upper metal sealing ring 71 and the lower metal sealing ring 72.

[0053] Specifically, the upper part of the tubing cross head 1 is annularly provided with sealing grooves from top to bottom, and the upper FS sealing ring 11 and the lower FS sealing ring 12 that are staggered with the upper metal sealing ring 71 and the lower metal sealing ring 72 are sleeved in the two groups of sealing grooves, both of which are designed with double strands, and the inner sleeve is provided with a stretch-resistant reinforcing ring to enhance the stretch resistance of the upper FS sealing ring 11 and the lower FS sealing ring 12, improve the sealing performance, and prolong the service life.

[0054] The positions of the upper metal sealing ring 71 and the lower metal sealing ring 72 are adjusted to the upper region of the tubing cross head 1 to avoid the problem of jamming and bumping during the lowering process, and then the annular space between the tubing cross head 1 and the tubing hanger 2 is double-sealed again by the upper FS sealing ring 11 and the lower FS sealing ring 12 that are also located in the upper region of the tubing cross head 1, thereby further improving the sealing performance and safety performance between the tubing cross head 1 and the tubing hanger 2.

[0055] A method for using a large-diameter tubing hanger suitable for a tubing head cross fitting:

[0056] Step one, first, the air source of the outer air pump pressure port is supplied into the booster end 53 through the connecting end 52 of the three-way valve 51, reaches the main cylinder 54, and the booster air source reaches the several auxiliary cylinders 56 through the several booster pipes 55 of different lengths, and continuously boosts the pressure in the pressure storage space of the main cylinder 54 and the several auxiliary cylinders 56, to generate a boosting pressure force. If the boosting pressure force supplied into the main cylinder 54 is too large, or the boosting pressure in the main cylinder 54 needs to be released, the control three-way valve 51 is opened to release the channel of the pressure relief end 57, and then the boosting air source is discharged through the pressure relief end 57.

[0057] Step two, under the action of the boosting pressure force in the pressure storage space, the eleven work-shaped pieces 64 are forced to slide inward in the sliding cavity 62 in the support frame 4 synchronously, and the eleven work-shaped pieces 64 also stretch the eleven reset springs 63 at the same time, and the eleven work-shaped pieces 64 also drive the eleven excitation rods 65 to slide inward in the excitation holes 61 synchronously, and force the top pressure head 66 to resist the excitation of the upper metal sealing ring 71 on the pressure ring 74 transversely, and the elastic block 67 buffers the stress of the eleven work-shaped pieces 64 and the eleven excitation rods 65, and then the eleven excitation rods 65 in the horizontal direction synchronously excite the tubing hanger 2 in the tubing four-way head 1, to complete the pneumatic excitation sealing work.

[0058] Step three, at the same time, under the action of the horizontal excitation force of the top pressure head 66 on the eleven excitation rods 65, the pressure ring 74 forces the upper metal sealing ring 71 to slide downward in the tubing hanger 2 surface wall to the lower metal sealing ring 72, and after the clasp spring 73 is clamped to the upper edge of the upper metal sealing ring 71, the upper metal sealing ring 71 also elastically contracts the elastic ring 75, and the elastic ring 75 after contraction drives the upper sealing ring 76 to move downward and clamp to the lower sealing ring 77, to trigger the longitudinal sealing of the annular space between the upper metal sealing ring 71 and the lower metal sealing ring 72 which slides downward.

[0059] Step four, during this period, the lower metal sealing ring 72 is subjected to the transverse extrusion force generated by the downward sliding of the upper metal sealing ring 71, forces the expansion ring 8 in it to expand outward and stretch, and tightly adhere to the inner wall of the restraint ring 9, to form an annular closed space, and then the outermost stop ring 10 wraps the expansion ring 8 and the restraint ring 9 after expansion and restraint, and then, on the basis of the transverse and longitudinal double sealing of the upper metal sealing ring 71 and the lower metal sealing ring 72, the sealing work of expansion and stress elimination is completed synchronously.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A large-diameter tubing hanger adapted for use with tubing head four-way fittings, characterized in that, include: The oil pipe four-way connector (1) has an oil pipe suspension head (2) for oil pipe sealing arranged longitudinally inside the oil pipe four-way connector (1), and a support bracket (4) is fixed on the outside of the oil pipe four-way connector (1) by a mounting bracket (3). The oil pipe four-way connector (1) has an excitation hole (61) at one end near the oil pipe suspension head (2), which is staggered with the bolt reserved holes on the oil pipe four-way connector (1). A pressurization assembly is located on the support frame (4) and the pressurization assembly is used for pressurization activation by an external air pump; A three-way valve (51) is located on the outside of the support frame (4). The pressurization assembly also includes a connecting end (52) connected to the front end of the three-way valve (51) and connected to the pressurization port of an external air pump by an internal thread. The top of the three-way valve (51) is connected to a pressurization end (53), and a main cylinder (54) connected to the support frame (4) is connected to the pressurization end (53). The outer end of the main cylinder (54) is connected to the secondary cylinder (56) through pressure boosting pipes (55) of varying lengths, and is connected to the support frame (4). The head ends of the main cylinder (54) and the secondary cylinder (56) are provided with a sealed pressure storage space, and the bottom end of the three-way valve (51) is connected to a pressure relief end (57). The excitation assembly is located inside the support frame (4). The excitation assembly is used for sealing the oil pipe suspension head (2). The excitation assembly also includes a sliding cavity (62) opened inside the support frame (4) near the excitation hole (61). A reset spring (63) is embedded in the pressure storage space of the main cylinder (54) and the auxiliary cylinder (56). The inner end of the reset spring (63) is fixed with a I-shaped part (64) that slides with the sliding cavity (62). The inner side of the I-shaped part (64) is fitted with an excitation rod (65) that passes through the excitation hole (61), and a top pressure head (66) with a frustum design is provided on the inner side of the excitation rod (65). An elastic block (67) is provided between the I-shaped part (64) and the excitation rod (65). The oil pipe suspension head (2) is provided with a trigger assembly that matches the excitation assembly, and the trigger assembly includes a snap ring (73) that is snapped onto the oil pipe suspension head (2).

2. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 1, characterized in that: The triggering assembly also includes an upper metal sealing ring (71) and a lower metal sealing ring (72) that slide on the oil pipe four-way head (1) near the retaining ring (73), and adopts a frustum-shaped design, which slides inward to each other, and a pressure ring (74) that slides on the upper metal sealing ring (71) and slides with the oil pipe four-way head (1).

3. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 2, characterized in that: An elastic ring (75) that slides with the oil pipe four-way head (1) is fixed between the upper metal sealing ring (71) and the pressure ring (74), and an upper sealing ring (76) is sleeved on the outside of the elastic ring (75), and a lower sealing ring (77) that engages with the upper sealing ring (76) is sleeved on the upper edge of the lower metal sealing ring (72).

4. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 3, characterized in that: An expansion ring (8) is fitted on the outer side of the lower metal sealing ring (72) and is located below the lower sealing ring (77). A restraining ring (9) is fitted on the outer side of the expansion ring (8), and a stop ring (10) is fitted on the outer side of the restraining ring (9) and fixed to the lower edge of the lower metal sealing ring (72).

5. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 4, characterized in that: The upper part of the oil pipe four-way head (1) is provided with sealing grooves in a ring from top to bottom, and the upper FS sealing ring (11) and lower FS sealing ring (12) are provided in the two sets of sealing grooves, which are distributed alternately with the upper metal sealing ring (71) and the lower metal sealing ring (72).

6. A method of using a large-diameter tubing hanger adapted for use with a tubing head tee, based on the large-diameter tubing hanger adapted for use with a tubing head tee as described in claim 5, characterized in that: Includes the following steps: Step 1: First, the air source pressurized by the external air pump pressurization port is connected to the main cylinder (54) through the connection end (52) and the booster end (53) on the three-way valve (51), and then reaches the auxiliary cylinder (56) through several booster pipes (55) of different lengths. Step 2: Under the pressure of the booster, the tool (64) is forced to drive the eleven excitation rods (65) to slide inward synchronously in the excitation hole (61), and the top pressure head (66) is forced to resist the excitation by the upper metal sealing ring (71) on the pressure ring (74) laterally, thus completing the pneumatic excitation sealing work. Step 3: At the same time, the pressure ring (74) forces the upper metal sealing ring (71) to slide down inside the lower metal sealing ring (72) on the surface of the oil pipe suspension head (2), and also presses down on the elastic ring (75) and performs elastic contraction. Then, it drives the upper sealing ring (76) to move down and lock into the lower sealing ring (77), and performs longitudinal trigger sealing on the annular space between the upper metal sealing ring (71) and the lower metal sealing ring (72) that have slid down. Step 4: During this period, the lower metal sealing ring (72) is subjected to the lateral extrusion force generated by the downward movement of the upper metal sealing ring (71), which forces the expansion ring (8) inside to expand and stretch outward and stick tightly to the inner wall of the restraint ring (9) to form an annular sealed space, thus completing the expansion restraint sealing work.

Images