Fracturing gas production wellhead sealed by metal

Abstract

The utility model discloses a metal-sealed fracturing gas production wellhead, which belongs to the technical field of gas production wellheads and comprises a first pipeline and a second pipeline. According to the utility model, the first pipeline and the second pipeline are sealed through the metal sealing ring, so that the second insertion rings at the bottom of the first pipeline and the top of the second pipeline are inserted into the second ring groove for first-layer sealing, and the first insertion rings at the top and the bottom of the metal sealing ring are inserted into the first ring groove for second-layer sealing; in addition, when tiny movement is generated among the first pipeline, the second pipeline and the metal sealing ring, the second ring groove and the second inserting ring slide mutually, oil is effectively prevented from entering the position between the first inserting ring and the first ring groove, and the sealing effect is improved. And meanwhile, the first ring groove and the first insertion ring also slide, so that the stability of the metal sealing ring between the first pipeline and the second pipeline is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gas wellheads, and more specifically to a metal-sealed fracturing gas wellhead. Background Art

[0002] When the lower flange of the existing wellhead used for gas production is connected with the upper flange of the sleeve, a rubber ring is usually used for sealing. However, the use characteristics of the rubber ring have certain limitations and it is not acid-resistant and high-pressure-resistant. Therefore, when sealing the actual fracturing gas wellhead, a metal sealing ring is generally used instead of the rubber ring to achieve an acid-resistant, corrosion-resistant and high-pressure-resistant sealing effect to prevent leakage accidents.

[0003] After searching, the utility model patent with announcement number CN219452046U discloses a metal-sealed fracturing gas wellhead, in which the upper flange and the lower flange are provided with corresponding annular grooves I on the sealing annular surfaces, the metal sealing ring is placed in the upper and lower annular grooves I, the upper and lower annular surfaces of the metal sealing ring are provided with annular grooves II, through holes evenly distributed on the circumference are processed between the two annular grooves II, a polytetrafluoroethylene-lined rubber sealing ring is placed in the annular groove II, a metal gasket is installed between the polytetrafluoroethylene-lined rubber sealing ring and the bottom of the annular groove II, and a compression spring is installed in the through hole between the two metal gaskets; the patent arranges polytetrafluoroethylene-lined rubber sealing rings on the upper and lower annular surfaces of the metal seal, when the temperature rises, the length of the fastening bolts is extended, and the pressure on the metal seal becomes smaller, the polytetrafluoroethylene-lined rubber sealing ring compensates for the change and plays the role of a second seal, and a compression spring is arranged between the two polytetrafluoroethylene-lined rubber sealing rings to strengthen the seal.

[0004] However, the above patent still has the following shortcomings: when the fastening bolts are deformed by the external environment, gaps will also be generated between the upper flange, the lower flange and the inner raised ring, and the oil will enter the ring groove I, which will also affect the polytetrafluoroethylene lined rubber sealing ring, affecting the sealing effect; and the bolts and nuts for installing the upper flange and the lower flange on the outside are directly placed outside, which will be affected by the external temperature difference and cause them to deform; the bolts and nuts will also be affected by the external environment and produce rust stains, affecting their disassembly and installation stability. For this reason, we propose a metal-sealed fracturing gas wellhead. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model aims to provide a metal-sealed fracturing gas production wellhead.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A metal-sealed fracturing gas production wellhead comprises a first pipeline and a second pipeline, a metal sealing ring is arranged between the first pipeline and the second pipeline, a first annular groove is provided on the bottom surface of the first pipeline and the top surface of the second pipeline, a first plug ring is provided on the top surface and the bottom surface of the metal sealing ring, two of the first plug rings are respectively movably sleeved into the inner cavity of the first annular groove, a second annular groove is provided on the top and bottom of the inner side surface of the metal sealing ring, a second plug ring is provided on the bottom of the first pipeline and the top of the second pipeline, the second plug ring is respectively movably sleeved into the inner cavity of the second annular groove, a third annular groove is provided on the two first plug rings, a plurality of movable holes are provided between the two third annular grooves, the inner cavities of the plurality of movable holes are sleeved with springs, the two ends of the spring extend to the inner cavities of the two third annular grooves and are fixedly connected with polytetrafluoroethylene lined rubber sealing rings, flanges are respectively fixedly sleeved on the outer sides of the first pipeline and the second pipeline, a plurality of connecting holes are provided on the flanges, bolts are sleeved on the plurality of connecting holes, nuts are threadedly installed on the bottom ends of the bolts, and a protective mechanism is sleeved on the outer sides of the first pipeline and the second pipeline.

[0008] As a preferred solution of the utility model, the protective mechanism includes a plurality of fixed sleeves which are respectively fixedly sleeved on the outside of the first pipe and the second pipe, the outsides of the plurality of fixed sleeves are sleeved with a first protective shell, the outsides of the plurality of fixed sleeves are sleeved with a second protective shell, the ends of the first protective shell and the second protective shell are fitted together, the interiors of the first protective shell and the second protective shell are both sleeved with thermal insulation cotton, the two ends of the inner cavity of the first protective shell are respectively fixedly connected with the second connecting seat, the two ends of the inner cavity of the second protective shell are respectively fixedly connected with the first connecting seat, a slot is opened on the side of the second connecting seat, a magnet block is fixedly connected to the inner wall of the slot, an iron pin is fixedly connected to the side of the first connecting seat, and the end of the iron pin is movably sleeved to the inner cavity of the slot and contacts with the magnet block.

[0009] As a preferred solution of the utility model, the inner diameters of the first pipe, the second pipe, the second insert ring and the metal sealing ring are equal.

[0010] As a preferred solution of the utility model, the side surface of the polytetrafluoroethylene-lined rubber sealing ring is in contact with the inner wall of the third ring groove, and the outer side surface of the first plug ring is in contact with the inner wall of the first ring groove.

[0011] As a preferred solution of the utility model, the inner side surfaces of the first protective shell and the second protective shell are respectively fitted with the outer side surfaces of the fixing sleeve and the flange.

[0012] As a preferred solution of the utility model, the side surface of the iron latch is in contact with the inner wall of the slot.

[0013] As a preferred solution of the present invention, the inner side surface of the second insert ring is in contact with the inner wall of the second ring groove.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] (1) In the utility model, the first pipe and the second pipe are sealed by a metal sealing ring, so that the second plug-in ring at the bottom of the first pipe and the top of the second pipe is inserted into the second ring groove to perform a first layer of sealing, and the first plug-in ring at the top and bottom of the metal sealing ring is inserted into the first ring groove to perform a second layer of sealing, and a spring and a polytetrafluoroethylene-lined rubber sealing ring are used to form a third layer of sealing. In addition, when a small movement occurs between the first pipe, the second pipe and the metal sealing ring, the second ring groove and the second plug-in ring slide against each other, effectively preventing oil from entering between the first plug-in ring and the first ring groove. At the same time, the first ring groove and the first plug-in ring also slide, ensuring the stability of the metal sealing ring between the first pipe and the second pipe, thereby improving its practicality.

[0016] (2) In the utility model, the first protective shell and the second protective shell are sleeved on the outside of two fixed sleeves, and the iron pin is inserted into the slot. The magnetism between the iron pin and the slot is used to fix the first protective shell and the second protective shell. The first protective shell and the second protective shell are used to protect the outside of the installed bolts. In addition, the thermal insulation cotton inside the first protective shell and the second protective shell is used to protect the bolts and nuts, so as to prevent the bolts and nuts from being affected by the external temperature, effectively prevent the bolts from being deformed, and improve the working quality of the metal-sealed fracturing gas wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is an exploded view of the overall structure of the utility model;

[0019] Figure 3 It is an exploded view of the cross-sectional structure of the utility model;

[0020] Figure 4 It is a cross-sectional schematic diagram of the first pipeline of the utility model;

[0021] Figure 5 It is a cross-sectional schematic diagram of the second pipeline of the utility model;

[0022] Figure 6 This is a structural explosion diagram of the metal sealing ring and the polytetrafluoroethylene-lined rubber sealing ring of the utility model;

[0023] Figure 7 It is a cross-sectional schematic diagram of the first protective shell and the second protective shell of the utility model;

[0024] Figure 8 For this utility model Figure 4 A is an enlarged schematic diagram;

[0025] Fig. 9 For this utility model Figure 5 The enlarged schematic diagram of point B in FIG.

[0026] Fig.10 For this utility model Figure 7 The enlarged schematic diagram is shown in Figure 2.

[0027] Description of the numbers in the figure:

[0028] 1. First pipeline; 2. Second pipeline; 3. Metal sealing ring; 4. First ring groove; 5. First plug ring; 6. Second ring groove; 7. Second plug ring; 8. Third ring groove; 9. Movable hole; 10. Spring; 11. Polytetrafluoroethylene-lined rubber sealing ring; 12. Protective mechanism; 13. Flange; 14. Connecting hole; 15. Bolt; 16. Nut; 17. Fixed sleeve; 18. First protective shell; 19. Second protective shell; 20. Insulation cotton; 21. First connecting seat; 22. Second connecting seat; 23. Slot; 24. Magnet block; 25. Iron latch. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Example:

[0033] See also Figure 1-10 A metal-sealed fracturing gas wellhead comprises a first pipeline 1 and a second pipeline 2, a metal sealing ring 3 is arranged between the first pipeline 1 and the second pipeline 2, a first annular groove 4 is provided on the bottom surface of the first pipeline 1 and the top surface of the second pipeline 2, a first plug-in ring 5 is arranged on the top and bottom surfaces of the metal sealing ring 3, and the two first plug-in rings 5 ​​are respectively movably sleeved into the inner cavity of the first annular groove 4, a second annular groove 6 is respectively arranged on the top and bottom of the inner side surface of the metal sealing ring 3, a second plug-in ring 7 is respectively arranged on the bottom of the first pipeline 1 and the top of the second pipeline 2, and the second plug-in ring 7 is respectively movably sleeved into the inner cavity of the second annular groove 6, and the two A third annular groove 8 is provided on each of the first plug rings 5, a plurality of movable holes 9 are provided between the two third annular grooves 8, the inner cavities of the plurality of movable holes 9 are sleeved with springs 10, the two ends of the spring 10 respectively extend to the inner cavities of the two third annular grooves 8 and are fixedly connected with polytetrafluoroethylene lined rubber sealing rings 11, flanges 13 are fixedly sleeved on the outer sides of the first pipe 1 and the second pipe 2, a plurality of connecting holes 14 are provided on the flanges 13, bolts 15 are sleeved on the plurality of connecting holes 14, nuts 16 are threadedly installed on the bottom ends of the bolts 15, and protective mechanisms 12 are sleeved on the outer sides of the first pipe 1 and the second pipe 2.

[0034] For details, please refer to Figure 1 , Figure 2 , Figure 7 and Fig.10The protective mechanism 12 includes a plurality of fixed sleeves 17 respectively fixedly sleeved on the outside of the first pipe 1 and the second pipe 2, a first protective shell 18 is sleeved on the outside of the plurality of fixed sleeves 17, a second protective shell 19 is sleeved on the outside of the plurality of fixed sleeves 17, the ends of the first protective shell 18 and the second protective shell 19 are fitted together, and the interiors of the first protective shell 18 and the second protective shell 19 are sleeved with thermal insulation cotton 20, the two ends of the inner cavity of the first protective shell 18 are respectively fixedly connected with the second connecting seat 22, the two ends of the inner cavity of the second protective shell 19 are respectively fixedly connected with the first connecting seat 21, a slot 23 is opened on the side of the second connecting seat 22, a magnet block 24 is fixedly connected to the inner wall of the slot 23, an iron pin 25 is fixedly connected to the side of the first connecting seat 21, and the end of the iron pin 25 is movably sleeved to the inner cavity of the slot 23 and contacts with the magnet block 24.

[0035] In this embodiment, the inner side of the first protective shell 18 and the second protective shell 19 is insulated by the heat insulation cotton 20 to prevent the bolts 15 from being expanded or contracted by heat or cold.

[0036] For details, please refer to Figure 3 The inner diameters of the first pipe 1, the second pipe 2, the second insert ring 7 and the metal sealing ring 3 are equal.

[0037] In this embodiment, the smoothness of the inner walls of the first pipe 1, the second pipe 2, the second insert ring 7 and the metal sealing ring 3 is ensured to ensure smooth movement of the fluid.

[0038] For details, please refer to Figure 4 and Figure 6 The side surface of the polytetrafluoroethylene-lined rubber sealing ring 11 is in contact with the inner wall of the third annular groove 8 , and the outer side surface of the first plug ring 5 is in contact with the inner wall of the first annular groove 4 .

[0039] In this embodiment, the stability of the polytetrafluoroethylene lined rubber sealing ring 11 in the third annular groove 8 is ensured by the fit between the side surface of the polytetrafluoroethylene lined rubber sealing ring 11 and the inner wall of the third annular groove 8. In addition, the stability of the first plug-in ring 5 inserted into the inner cavity of the first annular groove 4 is ensured, and the sealing performance of the first plug-in ring 5 inserted into the inner cavity of the first annular groove 4 is ensured.

[0040] For details, please refer to Figure 2 The inner side surfaces of the first protective shell 18 and the second protective shell 19 are respectively fitted with the outer side surfaces of the fixing sleeve 17 and the flange 13 .

[0041] In this embodiment, the stability of the first protective shell 18 and the second protective shell 19 being sleeved on the outer sides of the fixing sleeve 17 and the flange 13 is ensured.

[0042] For details, please refer to Fig.10 The side surface of the iron latch 25 is fitted with the inner wall of the slot 23 .

[0043] In this embodiment, the stability of the iron latch 25 inserted into the inner cavity of the slot 23 is ensured.

[0044] For details, please refer to Figure 3 The inner side surface of the second insert ring 7 is in contact with the inner wall of the second ring groove 6 .

[0045] In this embodiment, the stability and sealing of the second insert ring 7 inserted into the second ring groove 6 are ensured.

[0046] Working principle: When in use, first put the metal sealing ring 3 between the first pipe 1 and the second pipe 2, and at the same time, insert the first plug rings 5 ​​at the top and bottom of the metal sealing ring 3 into the first ring groove 4 at the bottom of the first pipe 1 and the top of the second pipe 2 respectively. At this time, the polytetrafluoroethylene lined rubber sealing ring 11 is retracted into the inner cavity of the third ring groove 8, and the spring 10 is in a compressed state. In addition, the second plug ring 7 is inserted into the inner cavity of the second ring groove 6. The metal sealing ring 3, the first ring groove 4, the first plug ring 5, the second ring groove 6 and the second plug ring 7 are used to seal the first pipe 1 and the second pipe 2. Then, the bolts 15 are respectively passed through the inner cavities of the two connecting holes 14, and the nuts 16 are threadedly installed on the bottom ends of the bolts 15, so as to connect the first pipe 1, the second pipe 2 and the metal sealing ring 3. Then, the first protective shell 18 and the second protective shell 19 are respectively put on the two fixed sleeves 17, and at the same time, the ends of the iron plug 25 are inserted into the slots 23. The iron plug 25 and the magnetic The magnetic attraction between the iron blocks 24 connects the first connecting seat 21 and the second connecting seat 22, and then connects the first protective shell 18 and the second protective shell 19. The first protective shell 18 and the second protective shell 19 are used to protect the outer sides of the bolts 15 and the nuts 16. At the same time, the thermal insulation cotton 20 inside the first protective shell 18 and the second protective shell 19 is used to protect the bolts 15 and the nuts 16 to prevent the bolts 15 and the nuts 16 from being affected by the external temperature, and effectively prevent the bolts 15 from deforming. Finally, when the bolts 15 inevitably deform, the first pipe 1 and the second pipe 2 will separate, and at the same time, the second plug ring 7 first slides in the second ring groove 6, and the first plug rings 5 ​​at the top and bottom of the metal sealing ring 3 slide in the first ring groove 4. At this time, the spring 10 drives the polytetrafluoroethylene lined rubber sealing ring 11 to move outward, and the polytetrafluoroethylene lined rubber sealing ring 11 is used to ensure the sealing between the metal sealing ring 3 and the first pipe 1 and the second pipe 2.

[0047] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the utility model according to the technical solution and improved ideas of the utility model, which should be included in the protection scope of the utility model.

Claims

1. A metal-sealed fracturing gas production wellhead, comprising a first pipeline (1) and a second pipeline (2), characterized in that: A metal sealing ring (3) is provided between the first pipe (1) and the second pipe (2); a first annular groove (4) is provided on the bottom surface of the first pipe (1) and the top surface of the second pipe (2); a first plug-in ring (5) is provided on the top and bottom surfaces of the metal sealing ring (3); the two first plug-in rings (5) are respectively movably sleeved into the inner cavity of the first annular groove (4); a second annular groove (6) is respectively provided on the top and bottom of the inner side surface of the metal sealing ring (3); a second plug-in ring (7) is respectively provided on the bottom of the first pipe (1) and the top of the second pipe (2); the second plug-in ring (7) is respectively movably sleeved into the inner cavity of the second annular groove (6); and a third annular groove (8) is provided on the two first plug-in rings (5). ), a plurality of movable holes (9) are provided between the two third annular grooves (8), the inner cavities of the plurality of movable holes (9) are sleeved with springs (10), the two ends of the springs (10) respectively extend to the inner cavities of the two third annular grooves (8) and are fixedly connected with polytetrafluoroethylene-lined rubber sealing rings (11), the outer sides of the first pipe (1) and the second pipe (2) are respectively fixedly sleeved with flanges (13), the flanges (13) are provided with a plurality of connecting holes (14), the plurality of connecting holes (14) are sleeved with bolts (15), the bottom ends of the bolts (15) are threadedly mounted with nuts (16), and the outer sides of the first pipe (1) and the second pipe (2) are sleeved with protective mechanisms (12).

2. The metal-sealed fracturing gas wellhead according to claim 1, characterized in that: The protection mechanism (12) comprises a plurality of fixed sleeves (17) respectively fixedly sleeved on the outside of the first pipe (1) and the second pipe (2); the outside of the plurality of fixed sleeves (17) is sleeved with a first protection shell (18); the outside of the plurality of fixed sleeves (17) is sleeved with a second protection shell (19); the ends of the first protection shell (18) and the second protection shell (19) are fitted together; the insides of the first protection shell (18) and the second protection shell (19) are sleeved with heat insulation cotton (20); The two ends of the inner cavity of the shell (18) are respectively fixedly connected with a second connection seat (22), and the two ends of the inner cavity of the second protective shell (19) are respectively fixedly connected with a first connection seat (21). A slot (23) is provided on the side of the second connection seat (22), and a magnet block (24) is fixedly connected to the inner wall of the slot (23). An iron latch (25) is fixedly connected to the side of the first connection seat (21), and the end of the iron latch (25) is movably sleeved into the inner cavity of the slot (23) and in contact with the magnet block (24).

3. The metal-sealed fracturing gas wellhead according to claim 1, characterized in that: The inner diameters of the first pipe (1), the second pipe (2), the second insert ring (7) and the metal sealing ring (3) are equal.

4. The metal-sealed fracturing gas wellhead according to claim 1, characterized in that: The side surface of the polytetrafluoroethylene-lined rubber sealing ring (11) is in contact with the inner wall of the third annular groove (8), and the outer side surface of the first insert ring (5) is in contact with the inner wall of the first annular groove (4).

5. The metal-sealed fracturing gas wellhead according to claim 2, characterized in that: The inner side surfaces of the first protective shell (18) and the second protective shell (19) are respectively fitted with the outer side surfaces of the fixing sleeve (17) and the flange (13).

6. The metal-sealed fracturing gas wellhead according to claim 2, characterized in that: The side surface of the iron latch (25) is in contact with the inner wall of the slot (23).

7. The metal-sealed fracturing gas wellhead according to claim 1, characterized in that: The inner side surface of the second insert ring (7) is in contact with the inner wall of the second ring groove (6).

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