Large-drift-diameter tubing hanger matched with tubing head four-way joint for use and use method of large-drift-diameter tubing hanger

Abstract

The invention discloses a large-drift-diameter tubing hanger matched with a tubing head four-way joint for use and a using method, and relates to the technical field of oil exploitation instruments.The large-drift-diameter tubing hanger matched with the tubing head four-way joint for use comprises a tubing four-way joint, and a tubing hanging head used for sealing a tubing is longitudinally arranged in the tubing four-way joint; a bearing frame is fixed on the outer side of the oil pipe four-way head through a mounting support; the bearing frame is provided with a pressurizing assembly used for being externally connected with an air pump to conduct pressurizing activation, the pressurizing assembly comprises a three-way valve arranged on the outer side of the bearing frame, and an excitation assembly used for sealing the oil pipe hanging head is arranged in the bearing frame. The excitation hole is formed in the position, close to the oil pipe hanging head, of the oil pipe four-way head, and a triggering assembly matched with the excitation assembly is arranged on the oil pipe hanging head. According to the device, a pneumatic abutting mode is adopted, and under the condition that efficient excitation sealing is achieved on the oil pipe hanging head through the eleven ejector rods, longitudinal trigger sealing and stress counteracting work are synchronously completed.

Description

Technical Field

[0001] This invention relates to the field of oil extraction equipment technology, and in particular to a large-diameter oil pipe hanger adapted for use with a four-way oil pipe head and its method of use. Background Technology

[0002] Tubing hangers are key devices used in oil and gas well production to suspend the weight of the tubing string in the well and prevent it from falling. Their core function is to seal the annular space between the tubing and the casing to isolate the formation pressure from the wellhead equipment. Generally, tubing hangers are fitted and installed inside the tubing four-way connector for subsequent tubing sealing and suspension.

[0003] During the installation of the tubing hanger inside the tubing four-way connector, the metal seal between the standard-sized tubing hanger and the four-way body is located at the lower end of the body. This makes it susceptible to damage and deformation during installation, and replacement is difficult after damage. Large-diameter tubing hangers place higher demands on installation convenience and reliable sealing. For metal seal activation methods, such as using threaded screw-operated push rods for manual activation, the large number of push rods required, the high manual tightening intensity, and the long processing time not only increase the risk of incorrect or incomplete activation but also lead to inadequate sealing, affecting the stability of subsequent tubing and creating safety hazards. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing large-diameter tubing hangers and methods of use for tubing head four-way fittings, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to change the lower metal sealing position of the conventional size oil pipe hanger and oil pipe four-way body to the upper metal sealing position to achieve its sealing safety and reliability, and how to solve the problem of simultaneously completing longitudinal trigger sealing and stress relief under the condition of using pneumatic clamping method to achieve efficient activation of sealing through eleven push rods to the oil pipe suspension head.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a large-diameter tubing hanger adapted for use with a tubing head four-way connector, comprising a tubing four-way connector, wherein a tubing hanger for tubing sealing is longitudinally arranged inside the tubing four-way connector, and a support frame is fixed on the outside of the tubing four-way connector by a mounting bracket; and a pressurizing component for activation by an external air pump is provided on the support frame, and a three-way valve is provided on the outside of the support frame, and an activation component for sealing the tubing hanger is provided inside the support frame; and an activation hole is provided on the tubing four-way connector near the tubing hanger, and is staggered with the bolt pre-drilled holes thereon, and a triggering component that matches the activation component is provided on the tubing hanger, and a retaining spring is provided that is snapped onto the tubing hanger.

[0008] As a preferred embodiment of the large-diameter oil pipe hanger and its usage method adapted for use with the four-way oil pipe head described in this invention, the pressurizing component further includes a connecting end connected to the front end of the three-way valve, and is connected to the pressure port of an external air pump by means of internal thread, and the top of the three-way valve is connected to a pressurizing end, and the pressurizing end is connected to a main cylinder body connected to the support frame.

[0009] As a preferred embodiment of the large-diameter oil pipe hanger and its usage method adapted for use with the four-way valve of the present invention, wherein: the outer end of the main cylinder is connected to the secondary cylinder through a pressure boosting pipe of varying lengths and is connected to the support frame, and the head ends of the main cylinder and the secondary cylinder are provided with a sealed pressure accumulator space, and a pressure relief end is connected to the bottom end of the three-way valve.

[0010] As a preferred embodiment of the large-diameter tubing hanger and its usage method adapted for use with tubing head four-way according to the present invention, the excitation assembly further includes a sliding cavity opened on the inner side of the support frame near the excitation hole, and a reset spring is embedded in the pressure storage space of the main cylinder and the auxiliary cylinder, and an I-shaped part that slides with the sliding cavity is fixed to the inner end of the reset spring.

[0011] As a preferred embodiment of the large-diameter oil pipe hanger and its usage method adapted for use with the four-way oil pipe head described in this invention, wherein: an excitation rod that passes through the excitation hole is sleeved on the inner side of the I-shaped part, and a top pressure head with a frustum-shaped design is provided on the inner side of the excitation rod, and an elastic block is provided between the I-shaped part and the excitation rod.

[0012] As a preferred embodiment of the large-diameter tubing hanger and its usage method adapted for use with tubing head four-way according to the present invention, the triggering component further includes an upper metal sealing ring and a lower metal sealing ring that slide near the retaining ring of the tubing four-way head, and adopts a frustum-shaped design, slides inward towards each other, and a pressure ring that slides with the tubing four-way head is fixed on the upper metal sealing ring.

[0013] As a preferred embodiment of the large-diameter tubing hanger and its usage method adapted for use with tubing head four-way according to the present invention, wherein: an elastic ring that slides with the tubing head four-way is fixed between the upper metal sealing ring and the pressure ring, and an upper sealing ring is sleeved on the outside of the elastic ring, and a lower sealing ring that engages with the upper sealing ring is sleeved on the upper edge of the lower metal sealing ring.

[0014] As a preferred embodiment of the large-diameter tubing hanger and its usage method adapted for use with tubing head four-way according to the present invention, wherein: an expansion ring is sleeved on the outer side of the lower metal sealing ring and is located below the lower sealing ring, and a restraining ring is sleeved on the outer side of the expansion ring, and a stop ring fixed to the lower edge of the lower metal sealing ring is sleeved on the outer side of the restraining ring.

[0015] As a preferred embodiment of the large-diameter tubing hanger and its usage method adapted for use with tubing head four-way according to the present invention, wherein: the upper part of the tubing four-way head is provided with sealing grooves in an annular shape from top to bottom, and upper FS sealing rings and lower FS sealing rings are provided in the two sets of sealing grooves, which are distributed alternately with upper metal sealing rings and lower metal sealing rings.

[0016] A method for using a large-diameter tubing hanger adapted for use with tubing head four-way fittings includes the following steps:

[0017] Step 1: First, pressurize the air from the external air pump through the connection end and the booster end of the three-way valve to the main cylinder, and then through several booster pipes of different lengths to the auxiliary cylinders.

[0018] Step 2: Under the pressure of the booster, the tooling is forced to move the root excitation rod inward synchronously in the excitation hole, and the top pressure head is forced to resist the excitation by the upper metal sealing ring on the pressure ring laterally, thus completing the pneumatic excitation sealing work.

[0019] Step 3: At the same time, the pressure ring forces the upper metal sealing ring to slide down inside the lower metal sealing ring on the surface of the oil pipe suspension head, and also presses down on the elastic ring and performs elastic contraction. Then, it drives the upper sealing ring to move down and lock into the lower sealing ring, and performs longitudinal trigger sealing on the annular space between the upper and lower metal sealing rings that have slid down to reach.

[0020] Step 4: During this period, the lower metal sealing ring is subjected to the lateral extrusion force generated by the downward movement of the upper metal sealing ring, which forces the expansion ring inside to expand and stretch outward and adhere tightly to the inner wall of the restraint ring, forming an annular sealed space and completing the expansion restraint sealing work.

[0021] The beneficial effects of this invention are as follows: By using the pressurization component and the activation component, and employing a pneumatic clamping method, the oil pipe suspension head is laterally activated and sealed through the root push rod, replacing the manual screwing activation method. This method is convenient, quick, has a low error tolerance, and is highly accurate. Through the trigger component, based on a secondary triggering mechanism, the oil pipe suspension head is sealed longitudinally, achieving a dual sealing effect in both the lateral and longitudinal directions. It also restrains and offsets the generated compressive stress, preventing insufficient sealing of the annular space of the oil pipe suspension head and potential safety hazards. This invention is safe and reliable. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A scene diagram of a large-diameter tubing hanger adapted for use with tubing head four-way fittings.

[0024] Figure 2 This is a side view of the tubing suspension head, support bracket, pressurization assembly, ignition assembly, and trigger assembly.

[0025] Figure 3 This is a side view of the tubing four-way connector and support bracket.

[0026] Figure 4 This is a top cross-sectional view of the support frame, pressurization assembly, and excitation assembly.

[0027] Figure 5 This is an exploded side view of the booster assembly and the excitation assembly.

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

[0029] Figure 7 This is an exploded view of the tubing suspension head and trigger assembly.

[0030] Figure 8 This is the exploded view of the triggering component.

[0031] In the diagram: 1. Tubing four-way connector; 2. Tubing suspension head; 3. Mounting support; 4. Support bracket; 51. Three-way valve; 52. Connecting end; 53. Pressure boosting end; 54. Main cylinder; 55. Pressure boosting pipe; 56. Secondary cylinder; 57. Pressure relief end; 61. Excitation hole; 62. Sliding cavity; 63. Return spring; 64. I-shaped part; 65. Excitation rod; 66. Top pressure head; 67. Elastic block; 71. Upper metal sealing ring; 72. Lower metal sealing ring; 73. Snap ring; 74. Pressure ring; 75. Elastic ring; 76. Upper sealing ring; 77. Lower sealing ring; 8. Expansion ring; 9. Restriction ring; 10. Stop ring; 11. Upper FS sealing ring; 12. Lower FS sealing ring. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0035] Example 1, referring to Figures 1 to 8 This is the first embodiment of the present invention. This embodiment provides a large-diameter tubing hanger adapted for use with a tubing head four-way connector, including a tubing four-way connector 1, a tubing hanger 2 for tubing sealing arranged longitudinally inside the tubing four-way connector 1, and a support frame 4 fixed on the outside of the tubing four-way connector 1 by a mounting bracket 3; and a pressurization component for external air pump pressurization activation is provided on the support frame 4, and a three-way valve 51 is provided on the outside of the support frame 4, and a pressure sensor is provided at the inner end of the three-way valve 51 for real-time monitoring of the pressure of the pressurizing air source flowing through the pressurizing port of the air pump inside and outside the three-way valve 51, so as to prevent insufficient external air source pressure, timely pressurization operation, and ensure sufficient external air source pressure.

[0036] Specifically, it also includes a connection end 52 connected to the front end of the three-way valve 51, which is connected to the pressure port of an external air pump using internal threads, and a pressure boosting end 53 connected to the top of the three-way valve 51, and a main cylinder 54 connected to the support frame 4 connected to the pressure boosting end 53.

[0037] The air source pressurized by the external air pump is supplied to the booster end 53 through the connection end 52 on the three-way valve 51, and then reaches the main cylinder 54. The main cylinder 54, located in the middle of the support frame 4, serves as the carrier space to complete the initial supply of pressurized air source from the external air pump.

[0038] Specifically, the outer end of the main cylinder 54 is connected to the secondary cylinder 56 via pressurizing pipes 55 of varying lengths. The pressurizing pipes 55 of varying lengths are designed in an arc shape and are also staggered along several sets of secondary cylinders 56. Pressure gauges are installed on the last two secondary cylinders 56 for reading and are connected to the support frame 4. The head ends of the main cylinder 54 and the secondary cylinders 56 are provided with sealed pressure storage spaces, and the bottom end of the three-way valve 51 is connected to a pressure relief end 57. If the pressurization pressure supplied into the main cylinder 54 is too high, or if it is necessary to release the pressurization pressure in the main cylinder 54, the three-way valve 51 is controlled to open the channel of the pressure relief end 57. The excessive or discharged pressurized air source is then released through the pressure relief end 57, achieving the effect of pressure regulation and pressure relief.

[0039] The pressurized air source then reaches several auxiliary cylinders 56 through several pressurized pipes 55 of varying lengths, and continuously pressurizes in the pressure storage space at the head of the main cylinder 54 and several auxiliary cylinders 56, generating pressurized pressure to prepare for the subsequent sealing and activation of the oil pipe suspension head 2.

[0040] Furthermore, the support frame 4 is provided with an excitation assembly for sealing the tubing suspension head 2, including an excitation hole 61 opened on the tubing four-way head 1 near the tubing suspension head 2, and the hole is staggered with the bolt pre-drilled hole on it. It also includes a sliding cavity 62 opened on the inner side of the support frame 4 near the excitation hole 61, and a return spring 63 is embedded in the pressure storage space of the main cylinder 54 and the auxiliary cylinder 56, and the inner end of the return spring 63 is fixed with an I-shaped part 64 that slides with the sliding cavity 62.

[0041] Under the pressure boosting force in the accumulator space, the eleven I-shaped parts 64 are forced to slide inward synchronously in the sliding cavity 62 in the support frame 4, and the eleven return springs 63 are stretched to perform synchronous actions. When the pressure is released at the pressure relief end 57, as the pressurized air source in the accumulator space is released, the eleven I-shaped parts 64, which have lost the pressure boosting force, are forced to slide outward and reset under the elastic reset force of the eleven return springs 63.

[0042] An excitation rod 65, which intersects with the excitation hole 61, is sleeved on the inner side of the I-shaped part 64. A top pressure head 66 with a frustum-shaped design is provided on the inner side of the excitation rod 65. There are eleven excitation holes 61, excitation rods 65 and top pressure heads 66, which are arranged in a two-two-three-two-two and two-half ring-shaped manner along the longitudinal axis of the oil pipe suspension head 2 to achieve a comprehensive excitation and sealing effect on the oil pipe suspension head 2. An elastic block 67 is provided between the I-shaped part 64 and the excitation rod 65 to eliminate the compressive stress between the I-shaped part 64 and the excitation rod 65, so as to prevent the eleven excitation rods 65 from loosening and displacing after long-term excitation and pressure.

[0043] Eleven I-shaped parts 64 also drive eleven excitation rods 65 to slide inward synchronously in the excitation hole 61, and force the top pressure head 66 to resist the excitation by laterally pressing the upper metal sealing ring 71 on the pressure ring 74. The eleven excitation rods 65 in the horizontal direction simultaneously press against the oil pipe suspension head 2 in the oil pipe four-way head 1 to complete the pneumatic excitation sealing work.

[0044] Example 2, refer to Figures 1 to 8 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0045] Specifically, the tubing suspension head 2 is equipped with a triggering component that matches the excitation component, and includes a retaining ring 73 that is snapped onto the tubing suspension head 2. The retaining ring 73 snaps against the upper edge of the metal sealing ring 71 to prevent it from slipping upwards under force.

[0046] It also includes an upper metal sealing ring 71 and a lower metal sealing ring 72 that slide near the retaining ring 73 on the oil pipe four-way head 1. They are designed in a frustum shape and slide inwards towards each other. A pressure ring 74 that slides with the oil pipe four-way head 1 is fixed on the upper metal sealing ring 71. The pressure ring 74 is designed in a frustum shape that is matched with the eleven top pressure heads 66 to effectively resist and squeeze the pressure ring 74, so as to achieve effective force transmission.

[0047] Under the horizontal excitation force of the pressure head 66 on the eleven excitation rods 65, the pressure ring 74 forces the upper metal sealing ring 71 to slide down inside the lower metal sealing ring 72 on the surface wall of the oil pipe suspension head 2.

[0048] Specifically, 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. 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. The inner diameter of the upper sealing ring 76 is the same as the outer diameter of the lower sealing ring 77. After being squeezed and fitted, the lower sealing ring 77 can be completely stored and hidden, forming a sealed ring.

[0049] The sliding upper metal sealing ring 71 also elastically contracts the elastic ring 75. After contraction, the elastic ring 75 drives the upper sealing ring 76 to move down and lock into the lower sealing ring 77, thus longitudinally triggering a seal in the annular space between the sliding upper metal sealing ring 71 and the lower metal sealing ring 72.

[0050] Example 3, referring to Figures 1 to 8 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0051] Specifically, an expansion ring 8 is fitted around 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 around the outer side of the expansion ring 8. The inner wall of the restraining ring 9 has an annular groove that engages with the expansion ring 8 and the lower metal sealing ring 72. This prevents longitudinal skewing and detachment when the lower metal sealing ring 72 is forced to adhere to the restraining ring 9 under force. This serves to limit the detachment and eliminate longitudinal stress. A stop ring 10 is fitted around the outer side of the restraining ring 9 and is fixed to the lower edge of the lower metal sealing ring 72. The inner diameter of the stop ring 10 is the same as the outer diameter of the restraining ring 9. After compression and adhesion, the expansion ring 8 and the restraining ring 9 can be completely contained and hidden, forming a sealed annular whole.

[0052] The lower metal sealing ring 72 is subjected to lateral extrusion force generated by the downward sliding of the upper metal sealing ring 71, which forces the expansion ring 8 inside it to expand and stretch outward and adhere tightly to the inner wall of the restraint ring 9, forming an annular sealed space. Then, the outermost stop ring 10 wraps around the expansion ring 8 and the restraint ring 9 after expansion and restraint. Subsequently, based on the lateral and longitudinal double sealing of the upper metal sealing ring 71 and the lower metal sealing ring 72, the sealing work of expansion restraint and stress offset is completed simultaneously.

[0053] Specifically, the upper part of the oil pipe four-way head 1 is provided with sealing grooves in a ring from top to bottom. The upper FS sealing ring 11 and the lower FS sealing ring 12 are arranged in the two sets of sealing grooves, which are staggered with the upper metal sealing ring 71 and the lower metal sealing ring 72. Both adopt a double-strand design and are fitted with tensile-resistant reinforcing rings inside to enhance the tensile strength of the upper FS sealing ring 11 and the lower FS sealing ring 12, improve the sealing performance, and extend their service life.

[0054] The positions of the upper metal sealing ring 71 and the lower metal sealing ring 72 are adjusted to the upper area of ​​the tubing four-way head 1 to avoid jamming and collision during the lowering process. Then, the upper FS sealing ring 11 and the lower FS sealing ring 12, which are also located in the upper area of ​​the tubing four-way head 1, are used to perform a double sealing treatment on the annular space between it and the tubing four-way head 1, thereby further improving the sealing performance and safety performance between the tubing four-way head 1 and the tubing suspension head 2.

[0055] How to use a large-diameter tubing hanger adapted for use with tubing head four-way fittings:

[0056] Step 1: First, the air source pressurized by the external air pump is supplied to the booster end 53 through the connection end 52 on the three-way valve 51, and then reaches the main cylinder 54. The boosted air source then reaches several auxiliary cylinders 56 through several booster pipes 55 of different lengths, and is continuously pressurized in the pressure storage space at the head of the main cylinder 54 and several auxiliary cylinders 56, generating boosted pressure. If the boosted pressure supplied to the main cylinder 54 is too large, or if it is necessary to release the boosted pressure in the main cylinder 54, the three-way valve 51 is controlled to open the channel of the pressure relief end 57, and the excessive or discharged boosted air source is released through the pressure relief end 57.

[0057] Step 2: Under the pressure of the pressurization in the accumulator space, the eleven I-shaped parts 64 are forced to slide inward synchronously in the sliding cavity 62 in the support frame 4. At the same time as stretching the eleven return springs 63, the eleven I-shaped parts 64 also drive the eleven excitation rods 65 to slide inward synchronously in the excitation hole 61. This forces the top pressure head 66 to resist the excitation by laterally pressing against the upper metal sealing ring 71 on the pressure ring 74. The elastic block 67 provides stress buffering for the eleven I-shaped parts 64 and the excitation rods 65. The eleven excitation rods 65 in the horizontal direction simultaneously press against the oil pipe suspension head 2 in the oil pipe four-way head 1 to complete the pneumatic excitation sealing work.

[0058] Step 3: Simultaneously, under the horizontal excitation force of the pressure head 66 on the eleven excitation rods 65, the pressure ring 74 forces the upper metal sealing ring 71 to slide down into the lower metal sealing ring 72 on the surface wall of the oil pipe suspension head 2. After the snap ring 73 engages and stops the upper metal sealing ring 71, the sliding upper metal sealing ring 71 also elastically contracts the elastic ring 75. The contracted elastic ring 75 drives the upper sealing ring 76 to move down and lock into the lower sealing ring 77, thus longitudinally triggering a seal in the annular space between the sliding upper metal sealing ring 71 and the lower metal sealing ring 72.

[0059] Step 4: During this period, the lower metal sealing ring 72 is subjected to the lateral extrusion force generated by the downward sliding of the upper metal sealing ring 71, which forces the expansion ring 8 inside it to expand and stretch outward and adhere tightly to the inner wall of the restraint ring 9, forming an annular sealed space. Then, the outermost stop ring 10 wraps around the expansion ring 8 and the restraint ring 9 after expansion and restraint. Subsequently, based on the lateral and longitudinal double sealing of the upper metal sealing ring 71 and the lower metal sealing ring 72, the sealing work of expansion restraint and stress offset is completed simultaneously.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

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 excitation assembly is located inside the support frame (4). The excitation assembly is used for sealing the tubing suspension head (2). The tubing suspension head (2) is provided with a trigger assembly that matches the excitation assembly, and the trigger assembly includes a snap ring (73) that snaps onto the tubing 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 pressurization assembly also includes a connection end (52) connected to the front end of the three-way valve (51), which is connected to the pressure port of an external air pump by means of internal thread, and the top of the three-way valve (51) is connected to a pressurization end (53), and the main cylinder (54) connected to the support frame (4) is connected to the pressurization end (53).

3. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 2, characterized in that: 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).

4. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 3, characterized in that: The excitation assembly also includes a sliding cavity (62) opened on the inner side of the support frame (4) near the excitation hole (61), and a reset spring (63) is embedded in the pressure storage space of the main cylinder (54) and the auxiliary cylinder (56), and an I-shaped part (64) that slides with the sliding cavity (62) is fixed to the inner end of the reset spring (63).

5. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 4, characterized in that: 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), and an elastic block (67) is provided between the I-shaped part (64) and the excitation rod (65).

6. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 5, 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).

7. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 6, 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).

8. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 7, 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).

9. The large-diameter tubing hanger for use with tubing head four-way fittings as described in claim 8, 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).

10. 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 any one of claims 1-9, 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.

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