30000psi ultra-high pressure Christmas tree

Abstract

The application relates to the field of oil and gas wellhead equipment, and discloses a 30000 PSI superhigh-pressure gas production tree, which comprises a main body, the main body is used for mounting a tubing hanger, the tubing hanger is arranged in the main body, the tubing hanger is used for suspending a tubing, a pressure test channel, the pressure test channel is arranged in the main body, the pressure test channel is used for applying a test pressure to the outside of a first sealing sleeve and a second sealing sleeve, the first sealing sleeve and the second sealing sleeve are arranged between the main body and the tubing hanger, and the first sealing sleeve and the second sealing sleeve are used for sealing the gap between the main body and the tubing hanger; through the arrangement of the first sealing sleeve and the second sealing sleeve, the superhigh-pressure working condition still has good sealing effect, and the greater the pressure is, the better the sealing effect is; through the arrangement of a top screw and a limiting component, the tubing hanger can be doubly limited, so that the sudden pressure impact can be coped with, and accidents can be prevented.

Description

A 30000PSI ultra-high pressure gas-gathering tree Technical Field

[0001] This invention relates to the field of oil and gas wellhead equipment, and in particular to a 30,000 PSI ultra-high pressure wellhead. Background Technology

[0002] In the process of oil and gas extraction, the wellhead is a key piece of equipment connecting the wellhead to the surface gathering and transportation system, undertaking the important functions of controlling well production, regulating gas flow, and ensuring production safety. As oil and gas exploration and development advances into deeper and ultra-deep areas, downhole pressure and temperature continue to rise, and traditional wellheads can no longer meet the requirements of ultra-high pressure conditions of 30,000 PSI (pounds per square inch, a unit of pressure representing the force applied per square inch).

[0003] The existing gas tree design presents several technical challenges: the sealing fit between the tubing hanger, the tubing cross, and the gas tree flange is prone to failure under long-term conditions of ultra-high pressure (30,000 PSI) and high temperature; when the pressure between the tubing and the casing annulus is high, the set screw alone is insufficient to effectively prevent the tubing hanger from moving upward, which in turn leads to the failure of its metal seal. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that existing gas-gathering trees are difficult to cope with ultra-high pressure conditions.

[0005] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a 30000PSI ultra-high pressure gas-gathering tree, comprising:

[0006] The main body is used to install the oil pipe hanger;

[0007] The tubing hanger is located inside the main body and is used to suspend the tubing.

[0008] A pressure testing channel is provided inside the main body, and the pressure testing channel is used to apply test pressure to the outside of the first sealing sleeve and the second sealing sleeve.

[0009] The first sealing sleeve and the second sealing sleeve are disposed between the main body and the tubing hanger;

[0010] The first sealing sleeve and the second sealing sleeve are used to seal the gap between the body and the tubing hanger.

[0011] In a preferred embodiment of the 30000PSI ultra-high pressure gas-producing tree of the present invention: the main body includes an oil pipe four-way and a gas-producing tree flange bolted to the outside of the oil pipe four-way.

[0012] In a preferred embodiment of the 30000PSI ultra-high pressure gas production tree of the present invention: the main body further includes a bearing step opened inside the oil pipe cross;

[0013] The tubing hanger includes a tubing hanger body disposed inside the tubing cross and a mating step opened on the outside of the tubing hanger body.

[0014] The bearing step fits into the mating step, and the bearing step is used to support the oil pipe hanger.

[0015] In a preferred embodiment of the 30000PSI ultra-high pressure gas-gathering tree of the present invention: the pressure test channel includes a through hole opened inside the flange of the gas-gathering tree, and a pressure test interface communicating with the inside of the through hole.

[0016] In a preferred embodiment of the 30000PSI ultra-high pressure gas-gathering tree of the present invention: the main body further includes a first contact surface formed inside the gas-gathering tree flange;

[0017] The tubing hanger also includes a second contact surface formed on the outside of the tubing hanger body.

[0018] The first sealing sleeve includes a first auxiliary ring disposed on the outside of the tubing hanger body, a first sealing pad disposed inside the first auxiliary ring, a second mating surface disposed on the outside of the first auxiliary ring, a first sealing ring disposed on the outside of the first auxiliary ring, a first tapered groove formed inside the first sealing ring, a first lug disposed on the outside of the first sealing ring, a first support ring disposed on the outside of the first sealing ring, a first compression ring fixedly connected to the outside of the first support ring, and a first mating surface disposed on the outside of the first support ring.

[0019] Two first sealing gaskets are provided, one of which is located between the tubing hanger body and the first auxiliary ring, and the other is located between the gas tree flange and the first auxiliary ring.

[0020] The second mating surface is in contact with the second contact surface, and the first mating surface is in contact with the first contact surface;

[0021] The first extrusion ring is disposed inside the first conical groove.

[0022] In a preferred embodiment of the 30000PSI ultra-high pressure gas production tree of the present invention: the tubing hanger further includes a third contact surface opened on the outside of the tubing hanger body;

[0023] The second sealing sleeve includes a second support ring disposed on the outside of the tubing hanger body, a second compression ring fixedly connected to the outside of the second support ring, a third mating surface disposed on the outside of the second support ring, a second sealing ring disposed on the outside of the second support ring, a second conical groove opened inside the second sealing ring, a second lifting lug disposed on the outside of the second sealing ring, a second sealing gasket disposed inside the second sealing ring, and a second auxiliary ring disposed on the outside of the second sealing ring.

[0024] Two second sealing gaskets are provided, one of which is located between the tubing hanger body and the second sealing ring, and the other is located between the tubing tee and the second sealing ring.

[0025] The third mating surface is in contact with the third contact surface;

[0026] The second extrusion ring is disposed inside the second conical groove.

[0027] In a preferred embodiment of the 30000PSI ultra-high pressure gas production tree of the present invention: it further includes a top screw; the top screw includes a top screw body threadedly connected to the inside of the tubing four-way, and a pressure-applying slope opened at the end of the top screw body near the inside of the tubing four-way.

[0028] The second sealing sleeve also includes a pressure-receiving inclined surface formed on the outside of the second auxiliary ring;

[0029] The pressure-applying inclined surface is in contact with the pressure-receiving inclined surface, and the set screw is used to limit the oil pipe hanger.

[0030] In a preferred embodiment of the 30000PSI ultra-high pressure gas production tree of the present invention: it further includes a limiting component; the limiting component includes a connecting ring fixedly connected to the outside of the tubing hanger body, a contraction groove opened inside the connecting ring, an elastic limiting ring provided inside the contraction groove, an elastic limiting protrusion fixedly connected to the outside of the elastic limiting ring, and a notch opened inside the elastic limiting ring and the elastic limiting protrusion.

[0031] The main body also includes a limiting groove formed inside the oil pipe cross;

[0032] The elastic limiting ring and the elastic limiting protrusion are made of elastic material. The elastic limiting protrusion is disposed inside the limiting groove. The limiting component is used to limit the oil pipe hanger.

[0033] The beneficial effects of the present invention are as follows: by setting a first sealing sleeve and a second sealing sleeve, a good sealing effect can still be maintained under ultra-high pressure conditions, and the greater the pressure, the better the sealing effect. By setting a top screw and a limiting component, the oil pipe hanger can be doubly limited to cope with sudden pressure shocks and prevent accidents. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0035] Figure 1 shows a schematic diagram of the overall structure of the present invention.

[0036] Figure 2 shows a cross-sectional view of the overall structure of the present invention.

[0037] Figure 3 shows a schematic diagram of the test pressure channel structure of the present invention.

[0038] Figure 4 shows a schematic diagram of the four-way oil pipe structure of the present invention.

[0039] Figure 5 shows a schematic diagram of the tubing hanger structure of the present invention.

[0040] Figure 6 shows a schematic diagram of the first sealing sleeve structure of the present invention.

[0041] Figure 7 shows a schematic diagram of the second sealing sleeve structure of the present invention.

[0042] Figure 8 shows a schematic diagram of the limiting component structure of the present invention.

[0043] Figure 9 shows a top view of the elastic limiting ring of the present invention.

[0044] Figure 10 shows a schematic diagram of the overall structure assembly of the present invention.

[0045] Figure 11 shows an enlarged view of part A in Figure 10 of the present invention.

[0046] Figure 12 shows an enlarged view of part B in Figure 10 of the present invention.

[0047] Figure 13 shows an enlarged view of part C in Figure 10 of the present invention.

[0048] In the diagram: 1. Main body; 2. Tubing hanger; 3. Pressure test channel; 4. First sealing sleeve; 5. Second sealing sleeve; 6. Set screw; 7. Limiting component; 11. Tubing cross; 12. Gas tree flange; 13. Bearing step; 14. First contact surface; 15. Limiting groove; 21. Tubing hanger body; 22. Mating step; 23. Second contact surface; 24. Third contact surface; 31. Through hole; 32. Pressure test interface; 41. First auxiliary ring; 42. First sealing gasket; 43. Second mating surface; 44. First seal 45. First conical groove; 46. First lug; 47. First support ring; 48. First compression ring; 49. First mating surface; 51. Second support ring; 52. Second compression ring; 53. Third mating surface; 54. Second sealing ring; 55. Second conical groove; 56. Second lifting lug; 57. Second sealing gasket; 58. Second auxiliary ring; 59. Pressure-bearing inclined surface; 61. Top screw body; 62. Pressure-applying inclined surface; 71. Connecting ring; 72. Shrinkage groove; 73. Elastic limiting ring; 74. Elastic limiting protrusion; 75. Notch. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0050] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0051] Referring to Figures 1-13, this embodiment provides a 30000PSI ultra-high pressure gas production tree, including a main body 1, which is used to install an oil pipe hanger 2;

[0052] The tubing hanger 2 is installed inside the main body 1 and is used to suspend the tubing.

[0053] The pressure test channel 3 is located inside the main body 1 and is used to apply the test pressure to the outside of the first sealing sleeve 4 and the second sealing sleeve 5.

[0054] The first sealing sleeve 4 and the second sealing sleeve 5 are disposed between the main body 1 and the oil pipe hanger 2;

[0055] The first sealing sleeve 4 and the second sealing sleeve 5 are used to seal the gap between the main body 1 and the oil pipe hanger 2.

[0056] During installation, the tubing hanger 2, the first sealing sleeve 4, the second sealing sleeve 5, the set screw 6, and the limiting component 7 are first installed inside the main body 1, and then the assembly of the main body 1 is completed.

[0057] During normal operation, the oil pipe pressure inside the oil pipe hanger 2 is applied to the top of the first sealing sleeve 4 through the gap between the main body 1 and the oil pipe hanger 2, causing the first sealing sleeve 4 to deform. The deformed first sealing sleeve 4 will further fill the gap between the oil pipe hanger 2 and the main body 1, thereby improving the sealing effect.

[0058] At the same time, the wellhead of the gas well will generate upward tubing annular pressure. The tubing annular pressure is applied to the bottom of the tubing hanger 2 and lifts the tubing hanger 2 up. With the cooperation of the top screw 6 and the tubing hanger 2, the rise of the tubing hanger 2 will squeeze the second sealing sleeve 5, thereby deforming the second sealing sleeve 5. The deformed second sealing sleeve 5 will further fill the gap between the tubing hanger 2 and the main body 1 to improve the sealing effect.

[0059] When testing the sealing effect, the field annular test pressure can be applied to the first sealing sleeve 4 and the second sealing sleeve 5 through the test pressure channel 3. Under the action of the field annular test pressure, the first sealing sleeve 4 and the second sealing sleeve 5 will deform, thereby further filling the gap between the oil pipe hanger 2 and the main body 1, so as to improve the sealing effect.

[0060] At this time, it can be detected whether there is pressure leakage between the oil pipe hanger 2 and the main body 1. If no pressure leakage occurs, it can be known that the first sealing sleeve 4 and the second sealing sleeve 5 are not damaged and can meet the working requirements.

[0061] As one embodiment of the present invention, as shown in Figures 1 to 4, the main body 1 includes an oil pipe four-way 11 and a gas source tree flange 12 bolted to the outside of the oil pipe four-way 11.

[0062] The main body 1 also includes a load-bearing step 13 located inside the oil pipe cross 11;

[0063] The tubing hanger 2 includes a tubing hanger body 21 disposed inside the tubing cross 11, and a mating step 22 opened on the outside of the tubing hanger body 21.

[0064] The supporting step 13 fits into the mating step 22.

[0065] When the tubing hanger body 21 is placed inside the tubing cross 11, as the tubing hanger body 21 descends, the mating step 22 on the outside of the tubing hanger body 21 will gradually approach and fit against the bearing step 13. When the mating step 22 fits against the bearing step 13, the tubing hanger body 21 cannot continue to descend due to the obstruction of the bearing step 13. Then, the set screw 6 is installed to limit the tubing hanger 2, thus completing the installation and fixation of the tubing hanger 2.

[0066] It should be noted that, in order to improve the structural strength of the load-bearing step 13, the following measures can be taken for the load-bearing step 13:

[0067] (1) Welding process: Plasma transfer arc welding technology is used to weld 718 nickel-based alloy on the surface of the bearing step 13. The thickness of the weld layer on one side is controlled at 5mm~6mm and the hardness of the weld layer is 40~45HRC (Rockwell hardness).

[0068] (2) Heat treatment optimization: After welding, solution treatment (process steps: heat the bearing step 13 with 718 nickel-based alloy weld overlay to 980°C and hold for 2 hours, then cool with water) and aging treatment (process steps: heat the bearing step 13 with 718 nickel-based alloy weld overlay to 720°C and hold for 8 hours, then cool in air) are performed to improve the fatigue resistance of the material.

[0069] (3) Stress test: The stress distribution of the bearing step 13 under the combined load of the oil pipe weight and 30,000 PSI annular pressure was verified by finite element analysis (FEA). The maximum stress was lower than the yield strength of 718 alloy.

[0070] As one embodiment provided by the present invention, as shown in Figures 1 to 3 and Figure 10, the pressure test channel 3 includes a through hole 31 opened inside the gas sampling tree flange 12, and a pressure test interface 32 communicating with the inside of the through hole 31.

[0071] When testing the sealing performance, an external pressure pump can be connected through the test pressure interface 32 to apply pressurized fluid. The fluid enters the area between the tubing four-way 11, the gas tree flange 12, and the tubing hanger body 21 through the through hole 31, and acts directly on the bottom of the first sealing sleeve 4 and the top of the second sealing sleeve 5, so that the fluid can apply pressure to the bottom of the first sealing sleeve 4 and the top of the second sealing sleeve 5. This pressure is the field annular test pressure.

[0072] It should be noted that the present invention does not collect data when testing the sealing performance, and therefore is not affected by the oil pipe pressure and oil pipe annular pressure. The first sealing sleeve 4 and the second sealing sleeve 5 are only affected by the on-site annular test pressure.

[0073] The bottom of the first sealing sleeve 4 and the top of the second sealing sleeve 5 are deformed by the field annular test pressure, thereby further filling the gap between the gas tree flange 12 and the tubing hanger body 21, as well as the gap between the tubing cross 11 and the tubing hanger body 21. At this time, it is possible to detect whether there is any pressure leakage between the tubing cross 11, the gas tree flange 12 and the tubing hanger body 21. If no pressure leakage occurs, it can be known that the first sealing sleeve 4 and the second sealing sleeve 5 are not damaged and can meet the working requirements.

[0074] As one embodiment of the present invention, as shown in Figures 1-6, 10 and 11, the main body 1 further includes a first contact surface 14 formed inside the gas extraction tree flange 12;

[0075] The tubing hanger 2 also includes a second contact surface 23 located on the outside of the tubing hanger body 21;

[0076] The first sealing sleeve 4 includes a first auxiliary ring 41 disposed on the outside of the tubing hanger body 21, a first sealing pad 42 disposed inside the first auxiliary ring 41, a second mating surface 43 disposed on the outside of the first auxiliary ring 41, a first sealing ring 44 disposed on the outside of the first auxiliary ring 41, a first tapered groove 45 formed inside the first sealing ring 44, a first lug 46 disposed on the outside of the first sealing ring 44, a first support ring 47 disposed on the outside of the first sealing ring 44, a first compression ring 48 fixedly connected to the outside of the first support ring 47, and a first mating surface 49 disposed on the outside of the first support ring 47.

[0077] Two first sealing gaskets 42 are provided. One first sealing gasket 42 is provided between the tubing hanger body 21 and the first auxiliary ring 41, and the other first sealing gasket 42 is provided between the gas source tree flange 12 and the first auxiliary ring 41.

[0078] The second mating surface 43 is fitted with the second contact surface 23, and the first mating surface 49 is fitted with the first contact surface 14;

[0079] The first extrusion ring 48 is disposed inside the first conical groove 45;

[0080] The first sealing gasket 42 can be made of rubber.

[0081] In Figure 10, the thickened arrow at the top of the tubing hanger body 21 indicates the tubing pressure, the thickened arrow at the bottom of the tubing hanger body 21 indicates the tubing annulus pressure, and the thickened arrow inside the through hole 31 indicates the field annulus test pressure.

[0082] In Figure 11, the thickened arrow at the top of the first support ring 47 indicates the oil pipe pressure, and the thickened arrow at the bottom of the first auxiliary ring 41 indicates the field annular test pressure.

[0083] As shown in Figures 10 and 11, since the first auxiliary ring 41 is provided with a first sealing gasket 42 between the gas tree flange 12 and the tubing hanger body 21, and the tubing four-way 11 is fastened to the gas tree flange 12 by bolts, the first sealing sleeve 4 is pressed between the gas tree flange 12 and the tubing hanger body 21, so the first sealing sleeve 4 has the auxiliary sealing function in the initial state.

[0084] During normal data collection, the pressure test interface 32 is not connected to any device.

[0085] As shown in Figure 10, after the fluid leaves the tubing, it will come into contact with the first sealing sleeve 4 through the gap between the gas tree flange 12 and the tubing hanger body 21. Since the first sealing sleeve 4 has an initial auxiliary sealing function, the fluid cannot leak. Therefore, the fluid will directly apply pressure to the first mating surface 49 at the top of the first support ring 47. This pressure is the tubing pressure.

[0086] As shown in Figures 11 and 6, after the oil pipe pressure is applied to the first mating surface 49, it will push the first support ring 47 downward, thereby causing the first extrusion ring 48 to move downward. However, under the action of the bearing step 13 and the mating step 22, the oil pipe hanger body 21 cannot move downward. Therefore, the oil pipe hanger body 21 will support the first auxiliary ring 41 and the first sealing ring 44, preventing the first auxiliary ring 41 and the first sealing ring 44 from moving downward. At this time, since the first sealing ring 44 cannot move downward, while the first extrusion ring 48 continues to move downward, under the action of the first extrusion ring 48 and the first conical groove 45, the first sealing ring 44 expands to both sides.

[0087] The expansion of the first sealing ring 44 to both sides will cause strong compression between the first lug 46 and the gas tree flange 12 and the tubing hanger body 21, resulting in deformation of the first lug 46 and a tighter fit with the surfaces of the gas tree flange 12 and the tubing hanger body 21, thereby improving the sealing effect.

[0088] It should be noted that the greater the oil pipe pressure, the greater the downward movement distance of the first support ring 47 and the greater the downward movement distance of the first compression ring 48, which in turn causes the first sealing ring 44 to expand to both sides to a greater extent, and the tighter the surface fit between the first lug 46 and the gas tree flange 12 and the oil pipe hanger body 21. In other words, the greater the oil pipe pressure, the better the sealing effect of the first sealing sleeve 4.

[0089] When testing the sealing effect of the first sealing sleeve 4, an external pressure pump can be used through the test pressure interface 32.

[0090] As shown in Figures 6, 10, and 11, an external pressure pump applies pressurized fluid through the through-hole 31. After the fluid enters the gap between the tubing four-way 11, the gas tree flange 12, and the tubing hanger body 21, it will directly contact the second mating surface 43 at the bottom of the first auxiliary ring 41. Since the first sealing sleeve 4 has the initial auxiliary sealing function, the fluid cannot leak. Therefore, the fluid will directly apply pressure to the first auxiliary ring 41. This pressure is the field annular test pressure.

[0091] When the annular test pressure is applied to the surface of the first auxiliary ring 41, it will push the first auxiliary ring 41 to rise. The rise of the first auxiliary ring 41 will drive the first sealing ring 44 to rise. However, since the first mating surface 49 at the top of the first support ring 47 is in contact with the first contact surface 14 of the gas tree flange 12, the first support ring 47 cannot rise, that is, the first compression ring 48 cannot rise. At this time, since the first compression ring 48 cannot rise, the rise of the first auxiliary ring 41 will cause the first sealing ring 44 to expand to both sides under the action of the first compression ring 48 and the first conical groove 45.

[0092] The expansion of the first sealing ring 44 to both sides will cause strong compression between the first lug 46 and the gas tree flange 12 and the tubing hanger body 21, resulting in deformation of the first lug 46 and a tighter fit with the surfaces of the gas tree flange 12 and the tubing hanger body 21, thereby achieving a better sealing effect.

[0093] At this time, it is possible to detect whether there is any pressure leakage between the oil pipe four-way 11, the gas tree flange 12 and the oil pipe hanger body 21. If no pressure leakage occurs, it can be known that the first sealing sleeve 4 is not damaged and can meet the working requirements. At this time, the inspection of the first sealing sleeve 4 can be completed.

[0094] As one embodiment provided by the present invention, as shown in Figures 1 to 5, 7, 10 and 13, the tubing hanger 2 further includes a third contact surface 24 formed on the outside of the tubing hanger body 21.

[0095] The second sealing sleeve 5 includes a second support ring 51 disposed on the outside of the tubing hanger body 21, a second compression ring 52 fixedly connected to the outside of the second support ring 51, a third mating surface 53 disposed on the outside of the second support ring 51, a second sealing ring 54 disposed on the outside of the second support ring 51, a second conical groove 55 formed inside the second sealing ring 54, a second lifting lug 56 disposed on the outside of the second sealing ring 54, a second sealing pad 57 disposed inside the second sealing ring 54, and a second auxiliary ring 58 disposed on the outside of the second sealing ring 54.

[0096] There are two second sealing pads 57. One second sealing pad 57 is located between the tubing hanger body 21 and the second sealing ring 54, and the other second sealing pad 57 is located between the tubing four-way connector 11 and the second sealing ring 54.

[0097] The third mating surface 53 is in contact with the third contact surface 24;

[0098] The second extrusion ring 52 is disposed inside the second conical groove 55;

[0099] The second sealing gasket 57 can be made of rubber.

[0100] In Figure 10, the thickened arrow at the top of the tubing hanger body 21 indicates the tubing pressure, the thickened arrow at the bottom of the tubing hanger body 21 indicates the tubing annulus pressure, and the thickened arrow inside the through hole 31 indicates the field annulus test pressure.

[0101] In Figure 13, the thickened arrow at the top of the second auxiliary ring 58 indicates the field annular test pressure, and the thickened arrow at the bottom of the second support ring 51 indicates the tubing annular pressure.

[0102] As shown in Figures 10 and 13, since the second sealing ring 54 is provided with a second sealing gasket 57 between the oil pipe four-way 11 and the oil pipe hanger body 21, and the second sealing sleeve 5 can be pressed between the oil pipe four-way 11 and the oil pipe hanger body 21 through the cooperation of the set screw 6 and the pressure inclined surface 59, the second sealing sleeve 5 has the auxiliary sealing function in the initial state.

[0103] During normal data collection, the pressure test interface 32 is not connected to any device.

[0104] As shown in Figure 10, the wellhead of the gas well will generate upward tubing annular pressure, and the second sealing sleeve 5 has the auxiliary sealing function in the initial state, so there will be no pressure relief, thus the tubing annular pressure will act directly on the bottom of the tubing hanger body 21.

[0105] As shown in Figure 13, under the action of the tubing annular pressure, the tubing hanger body 21 will move slightly upward. At this time, under the cooperation of the set screw 6 and the pressure inclined surface 59, the second auxiliary ring 58 cannot move upward, and the second sealing ring 54 cannot move upward due to the obstruction of the second auxiliary ring 58. The upward movement of the tubing hanger body 21 will drive the second support ring 51 and the second compression ring 52 to move upward.

[0106] When the second extrusion ring 52 moves upward, the second sealing ring 54 will expand to both sides due to the cooperation between the second extrusion ring 52 and the second conical groove 55.

[0107] The expansion of the second sealing ring 54 to both sides will cause strong compression between the second lifting lug 56 and the oil pipe four-way 11 and the oil pipe hanger body 21, resulting in deformation of the second lifting lug 56 and a tighter fit with the surfaces of the oil pipe four-way 11 and the oil pipe hanger body 21, thereby improving the sealing effect.

[0108] It should be noted that the greater the annular pressure of the tubing, the greater the upward movement distance of the tubing hanger body 21, the greater the upward movement distance of the second support ring 51 and the second compression ring 52, the greater the extent to which the second sealing ring 54 expands to both sides, and the greater the degree of deformation of the second lifting lug 56, thereby achieving a better sealing effect.

[0109] When testing the sealing effect of the second sealing sleeve 5, an external pressure pump can be used through the test pressure interface 32.

[0110] As shown in Figures 7, 10, and 13, the pressure pump applies pressurized fluid through the through-hole 31. After the fluid enters the gap between the tubing four-way 11, the gas tree flange 12, and the tubing hanger body 21, it will directly contact the top surface of the second auxiliary ring 58. Since the second sealing sleeve 5 has the auxiliary sealing function in the initial state, the fluid cannot leak. Therefore, the fluid will directly apply pressure to the top of the second sealing sleeve 5. This pressure is the field annular test pressure.

[0111] Under the pressure of the annular test, the second auxiliary ring 58 will move downward and drive the second sealing ring 54 to move downward. However, due to the influence of the bearing step 13 and the mating step 22 on the oil pipe hanger body 21, the oil pipe hanger body 21 cannot move downward. Therefore, the second support ring 51 and the second extrusion ring 52 cannot move downward. At this time, the downward movement of the second sealing ring 54 will cause the second sealing ring 54 to expand to both sides under the action of the second extrusion ring 52 and the second conical groove 55.

[0112] The expansion of the second sealing ring 54 to both sides will cause strong compression between the second lifting lug 56 and the oil pipe four-way 11 and the oil pipe hanger body 21, resulting in deformation of the second lifting lug 56 and a tighter fit with the surfaces of the oil pipe four-way 11 and the oil pipe hanger body 21, thereby achieving a better sealing effect.

[0113] At this time, it is possible to check whether there is any pressure leakage between the oil pipe four-way 11, the gas tree flange 12 and the oil pipe hanger body 21. If no pressure leakage occurs, it can be known that the second sealing ring 54 is not damaged and can meet the working requirements. At this time, the inspection of the second sealing ring 54 can be completed.

[0114] As one embodiment of the present invention, as shown in Figures 1, 2, 10 and 13, the present invention further includes a set screw 6; the set screw 6 includes a set screw body 61 threadedly connected inside the oil pipe cross 11, and a pressure-applying slope 62 formed at the end of the set screw body 61 near the inside of the oil pipe cross 11.

[0115] The second sealing sleeve 5 also includes a pressure-bearing inclined surface 59 formed outside the second auxiliary ring 58;

[0116] The pressure-applying inclined surface 62 is in contact with the pressure-receiving inclined surface 59.

[0117] When installing the tubing hanger body 21, after the tubing hanger body 21 is lowered to the point where the bearing step 13 contacts the mating step 22, the set screw body 61 can be turned so that the pressure-applying inclined surface 62 at the end of the set screw body 61 presses against the pressure-receiving inclined surface 59 at the top of the second auxiliary ring 58. Under the combined action of the pressure-applying inclined surface 62 and the pressure-receiving inclined surface 59, a downward pressure can be applied to the second sealing sleeve 5. At this time, without deformation of the second sealing sleeve 5, the tubing hanger body 21 cannot move upward, thus completing the limitation of the hanger body 21.

[0118] It should be noted that when the second sealing ring 54 deforms, the tubing hanger body 21 can move slightly upward.

[0119] As one embodiment of the present invention, as shown in Figures 1-5, 8-10 and 12, it further includes a limiting component 7; the limiting component 7 includes a connecting ring 71 fixedly connected to the outside of the tubing hanger body 21, a contraction groove 72 opened inside the connecting ring 71, an elastic limiting ring 73 disposed inside the contraction groove 72, an elastic limiting protrusion 74 fixedly connected to the outside of the elastic limiting ring 73, and a notch 75 opened inside the elastic limiting ring 73 and the elastic limiting protrusion 74;

[0120] The main body 1 also includes a limiting groove 15 opened inside the oil pipe four-way 11;

[0121] The elastic limiting ring 73 and the elastic limiting protrusion 74 are made of elastic material, and the elastic limiting protrusion 74 is disposed inside the limiting groove 15.

[0122] Since the elastic limiting ring 73 and the elastic limiting protrusion 74 have notches 75 inside, and the elastic limiting ring 73 and the elastic limiting protrusion 74 are made of elastic material, the elastic limiting ring 73 and the elastic limiting protrusion 74 can contract and expand.

[0123] During the installation of the tubing hanger body 21, when lowering the tubing hanger body 21, a compressive force should be applied to the elastic limiting ring 73 and the elastic limiting protrusion 74 to make the elastic limiting ring 73 and the elastic limiting protrusion 74 in a contracted state, and to make the elastic limiting ring 73 contracted inside the contraction groove 72, so as to prevent the elastic limiting protrusion 74 from blocking the lowering of the tubing hanger body 21 into the tubing cross 11.

[0124] After the tubing hanger body 21 is lowered into place, the squeezing force applied to the elastic limiting ring 73 and the elastic limiting protrusion 74 is released. At this time, the elastic limiting ring 73 and the elastic limiting protrusion 74 will return to their initial state under their own elastic action, and the elastic limiting protrusion 74 will be engaged in the limiting groove 15 inside the tubing four-way 11.

[0125] It should be noted that when the elastic limiting protrusion 74 enters the interior of the limiting groove 15, the elastic limiting ring 73 is still located inside the contraction groove 72.

[0126] Under the combined action of the elastic limiting protrusion 74 and the limiting groove 15, when the elastic limiting ring 73 and the elastic limiting protrusion 74 do not deform, the elastic limiting protrusion 74 and the elastic limiting ring 73 cannot move upward. And because the elastic limiting ring 73 is still located inside the contraction groove 72, the connecting ring 71 also cannot move upward. Since the connecting ring 71 is fixedly connected to the tubing hanger body 21, the tubing hanger body 21 also cannot move upward.

[0127] Therefore, with the cooperation of the elastic limiting protrusion 74 and the limiting groove 15, the tubing hanger body 21 can be further limited, and with the counterscrew 6 to limit the contact of the tubing hanger body 21, a double limiting effect can be achieved. This can resist the sudden pressure shock caused by abnormal conditions such as abnormal increase in tubing annular pressure and excessive wellbore temperature, thereby ensuring the integrity of the wellhead structure and avoiding accidents caused by excessive displacement of the tubing hanger 2.

[0128] In summary, by setting the first sealing sleeve 4 and the second sealing sleeve 5, a good sealing effect can still be maintained under ultra-high pressure conditions, and the higher the pressure, the better the sealing effect. The set top screw 6 and the limiting component 7 can provide double limiting for the oil pipe hanger 2 to cope with sudden pressure shocks and prevent accidents.

[0129] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A 30000PSI ultra-high pressure gas-producing tree, characterized in that: include, Main body (1), the main body (1) is used to install tubing hanger (2); the tubing hanger (2) is disposed inside the main body (1), the tubing hanger (2) is used to suspend tubing; pressure test channel (3), the pressure test channel (3) is disposed inside the main body (1), the pressure test channel (3) is used to apply test pressure to the outside of the first sealing sleeve (4) and the second sealing sleeve (5); the first sealing sleeve (4) and the second sealing sleeve (5) are disposed between the main body (1) and the tubing hanger (2); the first sealing sleeve (4) and the second sealing sleeve (5) are used to seal the gap between the main body (1) and the tubing hanger (2); the main body (1) Includes a tubing tee (11) and a gas tree flange (12) bolted to the outside of the tubing tee (11); the main body (1) also includes a bearing step (13) formed inside the tubing tee (11); the tubing hanger (2) includes a tubing hanger body (21) set inside the tubing tee (11) and a mating step (22) formed outside the tubing hanger body (21); the bearing step (13) fits against the mating step (22); the main body (1) also includes a first contact surface (14) formed inside the gas tree flange (12); the tubing hanger (2) also includes a first contact surface (14) formed inside the tubing hanger body (21). The second contact surface (23) on the outer side of the body (21); the first sealing sleeve (4) includes a first auxiliary ring (41) disposed on the outer side of the oil pipe hanger body (21), a first sealing pad (42) disposed inside the first auxiliary ring (41), a second mating surface (43) disposed on the outer side of the first auxiliary ring (41), a first sealing ring (44) disposed on the outer side of the first auxiliary ring (41), a first conical groove (45) opened inside the first sealing ring (44), a first lug (46) disposed on the outer side of the first sealing ring (44), a first support ring (47) disposed on the outer side of the first sealing ring (44), and a fixed connection to the first support ring ( 47) The first extrusion ring (48) on the outer side, and the first mating surface (49) provided on the outer side of the first support ring (47); two first sealing pads (42) are provided, one of which is provided between the tubing hanger body (21) and the first auxiliary ring (41), and the other is provided between the gas tree flange (12) and the first auxiliary ring (41); the second mating surface (43) is in contact with the second contact surface (23), and the first mating surface (49) is in contact with the first contact surface (14); the first extrusion ring (48) is provided inside the first conical groove (45).

2. The 30000PSI ultra-high pressure gas-gathering tree according to claim 1, characterized in that: The pressure test channel (3) includes a through hole (31) opened inside the gas tree flange (12) and a pressure test interface (32) communicating with the inside of the through hole (31).

3. A 30000PSI ultra-high pressure gas-gathering tree according to claim 2, characterized in that: The tubing hanger (2) further includes a third contact surface (24) formed on the outside of the tubing hanger body (21); the second sealing sleeve (5) includes a second support ring (51) formed on the outside of the tubing hanger body (21), a second compression ring (52) fixedly connected to the outside of the second support ring (51), a third mating surface (53) formed on the outside of the second support ring (51), a second sealing ring (54) formed on the outside of the second support ring (51), a second conical groove (55) formed inside the second sealing ring (54), and a second lifting lug (56) formed on the outside of the second sealing ring (54). The second sealing pad (57) is disposed inside the second sealing ring (54), and the second auxiliary ring (58) is disposed outside the second sealing ring (54); there are two second sealing pads (57), one of which is disposed between the oil pipe hanger body (21) and the second sealing ring (54), and the other of which is disposed between the oil pipe cross (11) and the second sealing ring (54); the third mating surface (53) is in contact with the third contact surface (24); the second extrusion ring (52) is disposed inside the second conical groove (55).

4. A 30000PSI ultra-high pressure gas-gathering tree according to claim 3, characterized in that: It also includes a set screw (6); the set screw (6) includes a set screw body (61) threaded inside the oil pipe tee (11), and a pressure-applying slope (62) opened at the end of the set screw body (61) near the inside of the oil pipe tee (11); the second sealing sleeve (5) also includes a pressure-receiving slope (59) opened outside the second auxiliary ring (58); the pressure-applying slope (62) fits against the pressure-receiving slope (59).

5. A 30000PSI ultra-high pressure gas-gathering tree according to claim 4, characterized in that: It also includes a limiting component (7); the limiting component (7) includes a connecting ring (71) fixedly connected to the outside of the tubing hanger body (21), a contraction groove (72) opened inside the connecting ring (71), an elastic limiting ring (73) provided inside the contraction groove (72), an elastic limiting protrusion (74) fixedly connected to the outside of the elastic limiting ring (73), and a notch (75) opened inside the elastic limiting ring (73) and the elastic limiting protrusion (74); the main body (1) also includes a limiting groove (15) opened inside the tubing four-way (11); the elastic limiting ring (73) and the elastic limiting protrusion (74) are made of elastic material, and the elastic limiting protrusion (74) is provided inside the limiting groove (15).

Images