A seal device for a Christmas tree port

Abstract

The utility model relates to the technical field of Christmas tree sealing technology discloses a sealing device for Christmas tree port, including Christmas tree pipe and apron, the fixed edge ring is fixedly installed on the Christmas tree pipe, the side inlaying installation of apron to fixed edge ring has the sealing gasket, the upper surface of sealing gasket and fixed edge ring is in accord with, the fixed edge ring is equidistant fixedly installed with the locating block, the apron is opened with the locating groove of the locating block adaptation in the corresponding position, the inside of a plurality of locating blocks all is provided with locking mechanism. The utility model realizes the synchronous action of all lock points through single point drive linkage mechanism, and cooperation wedge extrusion block and plug rod limiting design can complete the quick compression locking or complete release unlocking of apron quickly, compared with the traditional bolt fastening mode, the operation efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of oil well tree sealing technology, specifically a sealing device for the port of an oil well tree. Background Technology

[0002] In the field of oil and gas extraction, the wellhead is a critical piece of equipment installed at the wellhead to control and regulate the production process of oil and gas flowing from the bottom of the well to the surface gathering and transportation system. It consists of a series of valves, wing valves, main valves, four-way or three-way valves, pressure gauges, and connection ports. It is the core device ensuring safe, efficient, and controllable production of the oil well. Reliable and durable seals must be achieved between the various components of the wellhead, especially at the connection ports with wellhead equipment (such as casing head and tubing head) and downstream pipelines (such as production lines, kill lines, and test lines). These ports are subjected to high pressure, high temperature, corrosive fluids (such as crude oil, natural gas, formation water, H2S, CO2, etc.) from the bottom of the well, as well as potential vibration and thermal cycling loads. Failure of the port seal can lead to serious consequences.

[0003] However, existing equipment has the following problems when in use: In current oil and gas extraction equipment, the port of the wellhead and the end cap (or side valve cover, cap, etc.) generally adopt a flange-like connection structure, which is fastened by multiple sets of high-strength bolts. This connection method relies on the bolt preload to cause the sealing gasket (such as metal octagonal ring gasket, elliptical gasket, or spiral wound gasket, etc.) to undergo plastic or elastic deformation, thereby achieving reliable sealing under high pressure. Each installation or maintenance requires tightening or loosening multiple sets of bolts one by one according to a specific sequence and torque requirements. The operation process is complicated and time-consuming, especially in wellhead platforms with limited space or harsh environments, where the operation is even more difficult. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a sealing device for the port of the oil wellhead, which significantly improves the efficiency of installation, disassembly and maintenance operations.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sealing device for a wellhead port includes a wellhead tube and a cover plate. A fixing ring is fixedly installed on the wellhead tube. A sealing gasket is embedded in the side of the cover plate facing the fixing ring. The sealing gasket is in contact with the upper surface of the fixing ring. Positioning blocks are fixedly installed at equal intervals on the fixing ring. The cover plate has positioning grooves at corresponding positions that are adapted to the positioning blocks. Each of the positioning blocks has a locking mechanism inside.

[0007] Preferably, the locking mechanism includes a rotating rod and toothed plates. One end of the rotating rod is rotatably mounted inside the positioning block, and the other end of the rotating rod passes through the cover plate and is rotatably mounted inside the fixed side ring. A first gear is fixedly mounted on the rotating rod. There are two toothed plates, both of which are slidably mounted inside the positioning block. The two toothed plates are located on the front and rear sides of the first gear, respectively, and both toothed plates are meshed with the first gear. A pressing block is fixedly mounted on the side of each toothed plate away from the first gear, and the pressing block can be completely retracted into the positioning block.

[0008] Preferably, the extrusion block has a downward-facing inclined surface on the side opposite to the positioning block.

[0009] Preferably, a slider is fixedly installed on the toothed plate, and the positioning block has a groove at the corresponding position for the slider to slide.

[0010] Preferably, a second gear is fixedly installed on the side of each of the plurality of rotating rods away from the first gear, and an internal gear ring is rotatably installed inside the fixed side ring, wherein the internal gear ring is meshed with the plurality of second gears.

[0011] Preferably, a connecting rod is fixedly installed on one of the rotating rods, the connecting rod passes through the corresponding positioning block and is fixedly installed on the operating block, the operating block has a slot, the corresponding positioning block has two limiting grooves, an insert rod is movably installed on the slot, and the insert rod is plugged into both limiting grooves.

[0012] Preferably, a fixing plate is fixedly installed on the side of the operating block facing the positioning block, and a slide rail adapted to the fixing plate is provided on the positioning block. When the fixing plate abuts against the first and last ends of the slide rail respectively, the center of the slot is on the same straight line as the center of the corresponding limiting groove.

[0013] Preferably, a blocking block is fixedly installed at the center of the side of the cover plate facing the fixed edge ring, and the blocking block is interference-fitted with the inner wall of the oil well pipe.

[0014] Preferably, a sealing ring is embedded in the positioning block at the part where it contacts the fixing edge ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention achieves the synchronous extension or retraction of multiple positioning blocks with inclined pressing blocks by operating a single operating block to drive the internal gear ring and link all locking mechanisms. A single rotation can complete the synchronous operation of multiple points, realizing the full clamping and locking or complete release and unlocking of the cover plate. With the precise positioning design of the insertion rod and the limiting groove, the operating block can clearly sense and immediately lock the state (locked or unlocked) when it rotates to the correct position. This eliminates the cumbersome steps and time-consuming process of traditional multi-bolt fastening, significantly improving the efficiency of installation, disassembly and maintenance operations, while ensuring uniform distribution of clamping force and reliable maintenance of the state. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a sealing device for the port of an oil wellhead according to the present invention;

[0018] Figure 2 This is a schematic diagram showing the installation position of the positioning block for a sealing device at the end of an oil wellhead, as proposed in this utility model.

[0019] Figure 3 This is a schematic diagram of the locking mechanism of a sealing device for the wellhead port proposed in this utility model;

[0020] Figure 4 This is a schematic diagram showing the installation position of the internal toothed ring in a sealing device for the port of an oil wellhead, as proposed in this utility model.

[0021] Figure 5 This is a schematic diagram showing the location of the limiting groove for a sealing device at the end of an oil wellhead, as proposed in this utility model.

[0022] Figure 6 This is a schematic diagram showing the installation position of the fixing plate of the sealing device for the oil wellhead port proposed in this utility model;

[0023] Figure 7 This is a schematic diagram showing the installation position of the plug block of a sealing device for the port of an oil wellhead, as proposed in this utility model.

[0024] In the diagram: 1. Oil production tree pipe; 2. Fixed side ring; 3. Cover plate; 4. Positioning block; 5. Extrusion block; 6. Sealing ring; 7. Rotating rod; 8. First gear; 9. Tooth plate; 10. Second gear; 11. Sliding block; 12. Slide groove; 13. Internal toothed ring; 14. Connecting rod; 15. Operating block; 16. Slot; 17. Insert rod; 18. Limiting groove; 19. Slide rail; 20. Fixed plate; 21. Block; 22. Sealing gasket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Please see Figures 1 to 7 A sealing device for the port of a tree, comprising a tree pipe 1 and a cover plate 3, wherein a fixing edge ring 2 is fixedly installed on the tree pipe 1.

[0027] The fixed edge ring 2 is the base platform for sealing. It is welded or bolted to the end face of the oil well pipe 1. Before installing the sealing device, it is necessary to ensure that the upper surface of the fixed edge ring 2 is clean, flat and undamaged. The cleanliness of the contact surface is guaranteed to ensure the subsequent sealing effect.

[0028] A sealing gasket 22 is inlaid on the side of the cover plate 3 facing the fixed edge ring 2. The sealing gasket 22 is in contact with the upper surface of the fixed edge ring 2. Positioning blocks 4 are fixedly installed at equal intervals on the fixed edge ring 2. The cover plate 3 has a positioning groove that matches the positioning block 4 at the corresponding position. The multiple positioning blocks 4 are all equipped with a locking mechanism inside.

[0029] It is worth noting that the sealing gasket 22 should be made of a high-pressure resistant elastic material (such as fluororubber), and the amount of compression deformation should be checked regularly. If the thickness wear exceeds a certain level, it needs to be replaced.

[0030] When installing the cover plate 3, first align the positioning groove on the cover plate 3 precisely with the positioning block 4 on the fixed edge ring 2, and then carefully lower the cover plate 3 so that the sealing gasket 22 falls smoothly on the cleaned surface of the fixed edge ring 2. The cooperation between the positioning block 4 and the positioning groove ensures the precise alignment of the cover plate 3 relative to the oil tree port and the sealing gasket 22 relative to the fixed edge ring 2. After the cover plate 3 is fully seated on the positioning block 4, the locking mechanism inside the positioning block 4 can be operated to fix and press the cover plate 3.

[0031] like Figure 2 , Figure 3 As shown, the locking mechanism includes a rotating rod 7 and a toothed plate 9. One end of the rotating rod 7 is rotatably installed inside the positioning block 4, and the other end of the rotating rod 7 passes through the cover plate 3 and is rotatably installed inside the fixed side ring 2. A first gear 8 is fixedly installed on the rotating rod 7. There are two toothed plates 9, and both toothed plates 9 are slidably installed inside the positioning block 4. The two toothed plates 9 are located on the front and rear sides of the first gear 8, and both toothed plates 9 are meshed with the first gear 8. A pressing block 5 is fixedly installed on the side of the two toothed plates 9 away from the first gear 8. The pressing block 5 can be completely retracted into the positioning block 4.

[0032] When the rotating rod 7 is driven, it drives the first gear 8 fixed on it to rotate. Since the two toothed plates 9 are located on the front and rear sides of the first gear 8 respectively and mesh with the gear, the rotation of the gear will drive the two toothed plates 9 to slide synchronously in the positioning block 4 in opposite directions (one forward and one backward). The movement of the toothed plates 9 will drive the pressing block 5 at its end to extend out of the positioning block 4 or retract into the positioning block 4 synchronously. When the pressing block 5 is retracted into the positioning block 4, the pressing block 5 is completely retracted into the positioning block 4 so that the cover plate 3 can be freely placed or removed. When the pressing block 5 is extended out of the positioning block 4, the pressing block 5 extends outward and presses the cover plate 3, thereby firmly locking the cover plate 3 on the fixing edge ring 2.

[0033] like Figure 3 As shown, the extrusion block 5 has a downward-facing inclined surface on the side opposite to the positioning block 4.

[0034] As the pressing block 5 extends outward, the downward-facing inclined surface first contacts the inner wall of the positioning groove of the cover plate 3. As the pressing block 5 continues to extend, the interaction between the inclined surface and the vertical groove wall generates a downward component force (wedge effect). This downward force presses the cover plate 3 more tightly against the fixed edge ring 2, thereby enhancing the compression force on the sealing gasket 22 and significantly improving the reliability and pressure resistance of the seal. The angle design of the inclined surface ensures that the horizontal locking force can be effectively converted into the vertical pressing force during the locking process.

[0035] like Figure 3 As shown, a slider 11 is fixedly installed on the toothed plate 9, and a groove 12 for sliding of the slider 11 is provided in the corresponding position on the positioning block 4.

[0036] The cooperation between slider 11 and groove 12 ensures that toothed plate 9 always maintains linear motion during sliding without deviation or jamming. Groove 12 restricts the travel of slider 11 (and thus also restricts the travel of toothed plate 9 and pressing block 5), preventing it from overextending or retracting, and ensuring the reliability and consistency of the locking mechanism's operation.

[0037] like Figure 4 As shown, a second gear 10 is fixedly installed on the side of multiple rotating rods 7 away from the first gear 8. An internal gear ring 13 is rotatably installed inside the fixed side ring 2. The internal gear ring 13 is meshed with multiple second gears 10 to realize the synchronous start of multiple locking mechanisms.

[0038] When the operator drives the corresponding rotating rod 7 to rotate, the second gear 10 on the rotating rod 7 will drive the internal gear ring 13 that meshes with it to rotate. The rotation of the internal gear ring 13 will then drive all other second gears 10 that mesh with it to rotate synchronously. In this way, by operating only one operating block 15, the rotating rods 7 inside all the positioning blocks 4 can be driven to rotate synchronously, thereby allowing the pressing blocks 5 of all locking mechanisms to extend (lock) or retract (unlock) at the same time. This design greatly simplifies the operation, ensures that the pressing force applied to the cover plate 3 is evenly distributed, avoids the risk of leakage caused by individual points not being locked properly, and significantly improves the efficiency of installation and disassembly.

[0039] like Figure 5 ,like Figure 6 As shown, a connecting rod 14 is fixedly installed on one of the rotating rods 7. The connecting rod 14 passes through the corresponding positioning block 4 and is fixedly installed on the operating block 15. The operating block 15 has a slot 16. The corresponding positioning block 4 has two limiting grooves 18. A plug rod 17 is movably installed on the slot 16. The plug rod 17 and the two limiting grooves 18 are in a plug-in fit.

[0040] Rotating the operating block 15 will cause the rotating rod 7 to rotate, which in turn will link all locking mechanisms through the internal gear ring 13. The insertion rod 17 and the limiting groove 18 constitute a reliable locking status indication and holding device. When the operating block 15 rotates to a specific position (so that the pressing block 5 is fully extended and the cover plate 3 is locked), the opening of the slot 16 will align with one of the limiting grooves 18 ("locked" position). At this time, inserting the insertion rod 17 through the slot 16 and into the limiting groove 18 can physically lock the position of the operating block 15 (and the entire linkage mechanism) and prevent it from being accidentally rotated and unlocked.

[0041] Similarly, when unlocking, you need to first pull out the plug rod 17, rotate the operating block 15 to the unlock position (the squeezing block 5 is fully retracted), at which point the slot 16 will align with another limiting slot 18 ("unlock" position), and then insert the plug rod 17 to maintain the unlocked state.

[0042] like Figure 5 ,like Figure 6 As shown, a fixing plate 20 is fixedly installed on the side of the operating block 15 facing the positioning block 4. The positioning block 4 is provided with a slide rail 19 that is compatible with the fixing plate 20. When the fixing plate 20 abuts against the first and last ends of the slide rail 19 respectively, the center of the slot 16 is on the same straight line as the center of the corresponding limiting groove 18.

[0043] The arc length of the slide rail 19 limits the rotation angle range of the operating block 15. When the operating block 15 rotates to the limit position (the beginning or end of the slide rail 19), the fixing plate 20 will abut against the end point of the slide rail 19. The design ensures that at these two limit positions (fully locked and fully unlocked), the slot 16 on the operating block 15 is precisely aligned with the corresponding "locking" limit slot 18 or "unlocking" limit slot 18 on the positioning block 4. This allows the operator to clearly perceive that the rotation is in place and conveniently insert the plug rod 17 into the corresponding limit slot 18 to lock the position.

[0044] like Figure 7 As shown, a block 21 is fixedly installed at the center of the cover plate 3 facing the fixed edge ring 2. The block 21 is in an interference fit with the inner wall of the oil well pipe 1.

[0045] Once the cover plate 3 is in place and pressed down by the locking mechanism, the plug 21 will be tightly inserted into the hole or seat corresponding to the center of the tree pipe 1. Due to the interference fit design, the outer surface of the plug 21 and the inner wall of the tree pipe 1 will generate continuous radial compression, forming a second independent and reliable central sealing barrier.

[0046] like Figure 2 As shown, a sealing ring 6 is embedded in the positioning block 4 at the part where it contacts the fixed edge ring 2.

[0047] The sealing ring 6 embedded at the bottom of the positioning block 4 is used to prevent moisture, corrosive media or impurities in the external environment from entering the oil production tree pipe 1 through the installation gap of the positioning block 4, so as to ensure the long-term operation of the sealing mechanism.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing device for a wellhead port, comprising a wellhead pipe (1) and a cover plate (3), wherein a fixing edge ring (2) is fixedly installed on the wellhead pipe (1), characterized in that, A sealing gasket (22) is inlaid on the side of the cover plate (3) facing the fixed edge ring (2). The sealing gasket (22) is in contact with the upper surface of the fixed edge ring (2). Positioning blocks (4) are fixedly installed at equal intervals on the fixed edge ring (2). The cover plate (3) has a positioning groove adapted to the positioning block (4) at the corresponding position. A locking mechanism is provided inside the multiple positioning blocks (4).

2. A sealing device for the wellhead port according to claim 1, characterized in that, The locking mechanism includes a rotating rod (7) and a toothed plate (9). One end of the rotating rod (7) is rotatably installed inside the positioning block (4), and the other end of the rotating rod (7) passes through the cover plate (3) and is rotatably installed inside the fixed side ring (2). A first gear (8) is fixedly installed on the rotating rod (7). There are two toothed plates (9). Both toothed plates (9) are slidably installed inside the positioning block (4). The two toothed plates (9) are located on the front and rear sides of the first gear (8) respectively, and both toothed plates (9) are meshed with the first gear (8). A pressing block (5) is fixedly installed on the side of the two toothed plates (9) away from the first gear (8). The pressing block (5) can be completely retracted into the positioning block (4).

3. A sealing device for the wellhead port according to claim 2, characterized in that, The extrusion block (5) has a downward-facing inclined surface on the side opposite to the positioning block (4).

4. A sealing device for the wellhead port according to claim 2, characterized in that, A slider (11) is fixedly installed on the toothed plate (9), and the positioning block (4) has a groove (12) at the corresponding position for the slider (11) to slide.

5. A sealing device for the wellhead port according to claim 2, characterized in that, Each of the multiple rotating rods (7) has a second gear (10) fixedly installed on the side away from the first gear (8). An internal gear ring (13) is rotatably installed inside the fixed side ring (2). The internal gear ring (13) is meshed with the multiple second gears (10).

6. A sealing device for the wellhead port according to claim 5, characterized in that, One of the rotating rods (7) is fixedly mounted with a connecting rod (14), the connecting rod (14) passes through the corresponding positioning block (4) and is fixedly mounted with an operating block (15), the operating block (15) is provided with a slot (16), the corresponding positioning block (4) is provided with two limiting grooves (18), the slot (16) is movably mounted with a plug rod (17), and the plug rod (17) and the two limiting grooves (18) are all in plug-in fit.

7. A sealing device for the wellhead port according to claim 6, characterized in that, The operating block (15) is fixedly mounted with a fixing plate (20) on the side facing the positioning block (4). The positioning block (4) is provided with a slide rail (19) that is compatible with the fixing plate (20). When the fixing plate (20) abuts against the beginning and end of the slide rail (19), the center of the slot (16) is on the same straight line as the center of the corresponding limiting groove (18).

8. A sealing device for the wellhead port according to claim 1, characterized in that, A block (21) is fixedly installed at the center of the side of the cover plate (3) facing the fixed side ring (2), and the block (21) is in an interference fit with the inner wall of the oil production tree pipe (1).

9. A sealing device for the wellhead port according to claim 1, characterized in that, A sealing ring (6) is inlaid on the part of the positioning block (4) that contacts the fixing edge ring (2).

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