A plugging structure suitable for a flange screw thread

Abstract

The utility model relates to oil and gas pipeline leak protection technical field discloses a leak stoppage structure suitable for flange screw thread place, including annular and coaxial line setting's leak stoppage clamp, jackscrew body, piston piece and rubber ring, the upper surface of leak stoppage clamp is opened and has the concave accommodation groove, the piston piece and rubber ring are located in the accommodation groove and rubber ring is located above the piston piece, leak stoppage clamp is set in the sleeve periphery and is fixed on the sleeve, leak stoppage clamp is located below the flange and the upper surface of leak stoppage clamp is close to flange, the lower surface of leak stoppage clamp is opened and has the jackscrew hole of vertical access accommodation groove, jackscrew body inserts jackscrew hole and is cooperated with jackscrew hole thread, and the top end of jackscrew body is in close contact with piston piece. The utility model fixes the whole structure between the junction of flange and sleeve through clamp, on this basis, through jackscrew to push rubber ring and pressurized injection two kinds of sealing mode are used simultaneously and cooperate with each other, and double sealing structure can effectively guarantee the effect of plugging.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas pipeline leak prevention technology, and in particular to a leak-sealing structure suitable for flange thread joints. Background Technology

[0002] As attached Figure 1 As shown, during the development of oil and gas wells, the threads at the connection between the flange 1 and the casing 2 at the bottom of the wellhead tree often leak due to insufficient torque during threading or thread corrosion, causing oil, gas, water and other media in the well to seep out from the connection between the flange 1 and the casing 2.

[0003] Because the connection between flange 1 and sleeve 2 is stepped, and the leak point 3 is located at the right angle between flange 1 and sleeve 2, existing sealing clamps can only seal the connection between flange 1 or the threads between sleeve 2 and coupling. They cannot seal the threaded connection between flange 1 and sleeve 2. Therefore, it is necessary to design a special sealing structure to seal this part. Utility Model Content

[0004] To address the problems existing in the prior art, namely that existing sealing clamps cannot seal the threaded connection between the flange and the sleeve, the purpose of this utility model is to provide a sealing structure suitable for flange threads. The entire structure is fixed to the connection between the flange and the sleeve by a clamp. On this basis, two sealing methods, namely pushing the rubber ring with a push rod and applying pressure to inject glue, are used simultaneously and in coordination. The dual sealing structure can effectively ensure the sealing effect.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A leak-sealing structure suitable for flange threads includes a leak-sealing clamp, a push rod body, a piston, and a rubber ring arranged in a ring and coaxially. The upper surface of the leak-sealing clamp has a recessed receiving groove. The piston and rubber ring are located in the receiving groove, with the rubber ring located above the piston. The leak-sealing clamp is sleeved around a sleeve and fixed to the sleeve. The leak-sealing clamp is located below the flange, and the upper surface of the leak-sealing clamp is in close contact with the flange. The lower surface of the leak-sealing clamp has a push rod hole that leads vertically to the receiving groove. The push rod body is inserted into the push rod hole and threadedly engaged with the push rod hole. The top end of the push rod body abuts against the piston.

[0007] The present invention is further configured such that: a plurality of push rod holes are provided on the lower surface of the sealing fixture, and all the push rod holes are evenly distributed around the axis of the sealing fixture.

[0008] The present invention is further configured such that: the leak-sealing clamp includes a convex clamp and a concave clamp, and the leak-sealing clamp is formed by splicing the convex clamp and the concave clamp.

[0009] The present invention is further configured such that: the leak-sealing clamp also includes anti-slip fixing teeth, which are disposed on the inner wall of the leak-sealing clamp in contact with the sleeve.

[0010] The present invention is further configured such that: the top surface of the piston is inclined, the outer side of the top surface of the piston is higher than the inner side, the bottom surface of the rubber ring is adapted to the top surface of the piston, the top surface of the rubber ring is horizontal, and the side of the rubber ring that contacts the sleeve is vertical.

[0011] The present invention is further configured such that the radial dimensions of the piston and the rubber ring are adapted to the radial dimensions of the receiving groove.

[0012] The present invention is further configured to include an injection valve, and the sealing fixture is provided with an injection hole, the injection hole leading to the receiving groove, and the injection valve being inserted into and fixed in the injection hole.

[0013] The present invention is further configured such that: the leak-sealing fixture is provided with two or more glue injection holes, and the glue injection holes are distributed at intervals on the leak-sealing fixture.

[0014] The present invention is further configured such that: a plurality of push rod holes are provided on the lower surface of the sealing fixture, all of the push rod holes are evenly distributed around the axis of the sealing fixture, and the glue injection hole is located between two adjacent push rod holes in the vertical direction.

[0015] The present invention is further configured such that: the piston is composed of two semi-circular rings spliced ​​together, and the rubber ring has a slit in the circumferential direction that can unfold the rubber ring.

[0016] In summary, the beneficial effects achieved by this utility model are as follows:

[0017] (1) The leak-sealing clamp is sleeved and fixed around the outer side of the sleeve and the leak-sealing clamp is tightly attached to the lower surface of the flange, so that the rubber ring in the receiving groove of the leak-sealing clamp can contact and seal the leak point. The action of the push rod body on the piston and then on the rubber ring can press the rubber ring tightly against the leak point, thereby achieving the leak-proof effect;

[0018] (2) The injection hole leads to the receiving groove. The sealant can be injected into the receiving groove through the injection valve. The pressurized sealant can not only further press the piston and rubber ring towards the leakage point, but also form a sealing structure other than the rubber ring after the sealant solidifies. The double sealing structure can effectively ensure the sealing effect.

[0019] (3) The plugging fixture is formed by splicing a convex fixture and a concave fixture. At the same time, the piston is also spliced ​​by two semi-circular rings. The rubber ring is provided with a cut that can unfold the rubber ring, so as to facilitate the direct installation of the entire plugging structure and avoid affecting the normal operation of oil and gas extraction.

[0020] (4) The anti-slip fixing teeth on the inner wall of the leak-sealing clamp that contacts the casing can effectively increase the biting pressure between the leak-sealing clamp and the casing, ensuring that the leak-sealing clamp is installed firmly.

[0021] (5) The top surface of the piston and the bottom surface of the rubber ring are both inclined. When the piston squeezes the rubber ring vertically upward, since the outer side of the top surface of the piston is higher than the inner side, the piston not only has a vertical upward squeezing force on the rubber ring, but also a horizontal inward squeezing force towards the sleeve, thereby pressing the rubber ring tightly towards the leakage point and strengthening the leak prevention effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the leakage location between the flange and the sleeve in the background art of this utility model;

[0024] Figure 2 This is a schematic diagram of the leak-stopping structure in this utility model;

[0025] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0026] Figure 4 This is a front view of the leak-stopping structure in this utility model;

[0027] Figure 5 This is a top view of the leak-stopping structure in this utility model;

[0028] Figure 6 This is a schematic diagram showing the distribution of the injection holes and push rod holes in the receiving groove.

[0029] In the diagram: 1. Flange; 2. Sleeve; 3. Leakage point; 4. Leak-sealing clamp; 41. Convex clamp; 42. Concave clamp; 43. Anti-slip fixing teeth; 44. Injection hole; 45. Push rod hole; 46. Receiving groove; 47. Connecting plate; 48. Connecting bolt; 5. Injection valve; 6. Push rod body; 7. Piston; 8. Rubber ring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. For ease of explanation, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] As attached Figure 2-5 As shown, a leak-sealing structure suitable for flange threads is installed at the connection between flange 1 and sleeve 2, where leakage point 3 is prone to occur. Both flange 1 and sleeve 2 are cylindrical, with their axes coinciding and vertically aligned. Flange 1 is located directly above sleeve 2. The leak-sealing structure includes a leak-sealing clamp 4, an injection valve 5, a push rod body 6, a piston 7, and a rubber ring 8.

[0033] The leak-sealing clamp 4 is sleeved around the sleeve 2 and fixed to the sleeve 2, with the axis of the leak-sealing clamp 4 coinciding with the axis of the sleeve 2. Furthermore, the leak-sealing clamp 4 is located below the flange 1, and its upper surface is in close contact with the flange 1. The leak-sealing clamp 4 includes a convex clamp 41, a concave clamp 42, a connecting plate 47, and connecting bolts 48.

[0034] Both the convex clamp 41 and the concave clamp 42 are semi-circular ring structures, with convex and concave connecting parts respectively on their opposite sides. The leak-sealing clamp 4 can be formed by splicing the convex clamp 41 and the concave clamp 42. Furthermore, both the convex clamp 41 and the concave clamp 42 are provided with connecting plates 47. After the convex clamp 41 and the concave clamp 42 are spliced, connecting bolts 48 are passed through the connecting plates 47 on the convex clamp 41 and the concave clamp 42 respectively and tightened to firmly fix the leak-sealing clamp 4 onto the sleeve 2.

[0035] The sealing clamp 4 also includes anti-slip fixing teeth 43, which are disposed on the inner wall of the sealing clamp 4 in contact with the sleeve 2. During the tightening of the connecting bolt 48, the anti-slip fixing teeth 43 can increase the biting pressure between the sealing clamp 4 and the sleeve 2, thereby ensuring that the sealing clamp 4 is firmly installed on the sleeve 2 and preventing it from slipping.

[0036] The leak-sealing fixture 4 also includes an injection hole 44, a push rod hole 45, and a receiving groove 46.

[0037] The receiving groove 46 is an annular groove formed on the upper surface of the sealing clamp 4, and its axis coincides with the axis of the sleeve 2. The bottom surface of the receiving groove 46 is horizontal and lower than the upper surface of the sealing clamp 4, and the depth of the receiving groove 46 in the vertical direction is less than the height of the sealing clamp 4. The radial cross-sectional shape of the receiving groove 46 is rectangular, which is used to accommodate and limit the piston 7 and the rubber ring 8. The piston 7 and the rubber ring 8 in the receiving groove 46 directly contact the side of the sleeve 2 facing the sleeve 2.

[0038] The piston component 7 is composed of two semi-circular rings joined together. Its bottom surface is horizontal while its top surface is inclined. The inclined top surface makes the height of the outer side of the piston component 7 (i.e., the side away from the axis of the sleeve 2) higher than the height of the inner side of the piston component 7 (i.e., the side closer to the axis of the sleeve 2). The inner side of the piston component 7 is in close contact with the outer wall of the sleeve 2, and the outer side of the piston component 7 is in close contact with the side wall of the receiving groove 46. Both the inner and outer sides are vertically arranged.

[0039] Since the rubber ring 8 is a flexible material with a certain elastic deformation capability, it is only necessary to make a slit in the circumferential direction of the rubber ring 8 to allow the rubber ring 8 to be unfolded so that the rubber ring 8 can be fitted onto the sleeve 2.

[0040] The rubber ring 8 is located directly above the piston 7. The inner side of the rubber ring 8 is in close contact with the outer wall of the sleeve 2, and the outer side of the rubber ring 8 is in close contact with the side wall of the receiving groove 46. Both the inner and outer sides are vertically arranged. The top surface of the rubber ring 8 is horizontal and the bottom surface is inclined, and the bottom surface of the rubber ring 8 is adapted to the top surface of the piston 7.

[0041] The sum of the heights of the piston 7 and the rubber ring 8 is less than the depth of the receiving groove 46, and the radial dimension between the two sides of the piston 7 and the rubber ring 8 is adapted to the radial dimension of the receiving groove 46, so that the piston 7 and the rubber ring 8 can move vertically within the receiving groove 46.

[0042] The lower surface of the sealing fixture 4 is provided with a plurality of push rod holes 45. The push rod holes 45 are vertically arranged and the top of the push rod holes 45 communicates with the bottom of the receiving groove 46. In this embodiment, the convex fixture 41 and the concave fixture 42 are each provided with 4 push rod holes 45, and all the push rod holes 45 on the sealing fixture 4 are evenly distributed around the axis of the sealing fixture 4.

[0043] The push rod body 6 is a rod-shaped structure with threads on its outer wall that can mate with the push rod hole 45. The length of the threaded portion of the push rod body 6 is greater than the height of the push rod hole 45. As the push rod body 6 is screwed into the push rod hole 45, the top of the push rod body 6 gradually contacts and abuts against the piston 7, ultimately pressing the piston 7 and the rubber ring 8 tightly against the flange 1 above the sealing clamp 4.

[0044] The injection hole 44 is located on the outer side of the sealing fixture 4. The injection hole 44 is horizontally positioned and also leads into the receiving groove 46. Specifically, the injection hole 44 is connected to the bottom of the receiving groove 46. The sealing fixture 4 has two or more injection holes 44. In this embodiment, the sealing fixture 4 has a total of 6 injection holes 44, which are spaced apart on the sealing fixture 4.

[0045] As attached Figure 4-6 As shown, in the vertical direction, each injection hole 44 is located exactly in the middle between two adjacent push rod holes 45. The injection hole 44 has a thread that mates with the injection valve 5, which is screwed into and fixed within the injection hole 44. The injection valve 5 is existing technology; it allows for pressurized injection of sealant into the receiving groove 46. After injection, tightening the control bolt on the injection valve 5 closes the channel within the valve, preventing backflow of the sealant.

[0046] The implementation principle of the above embodiments is as follows:

[0047] During the installation of the leak-sealing structure, the convex clamp 41 and concave clamp 42 are fitted around the sleeve 2 and spliced ​​together to form the leak-sealing clamp 4. The connecting bolt 48 is passed through the connecting plate 47 but not tightened. First, the two halves of the piston 7 are placed into the receiving groove 46, and then the rubber ring 8 is placed into the receiving groove 46. At this time, the leak-sealing clamp 4 is moved to directly below the flange 1, so that the top surface of the leak-sealing clamp 4 is in contact with the bottom surface of the flange 1, and the connecting bolt 48 is tightened. The push rod body 6 is rotated, and the top of the push rod body 6 continuously pushes the piston 7 upward, and the rubber ring 8 is continuously pressed towards the leak point 3. While the piston 7 and the rubber ring 8 are pushed upward, an annular channel for the sealant to flow freely is created at the bottom of the receiving groove 46. An external sealant injection device injects sealant under pressure into the receiving groove 46 via the injection valve 5. The pressurized sealant further presses the piston 7 and rubber ring 8 against the leakage point 3, and the sealant, as a fluid, applies a more uniform pressure to the piston 7 and rubber ring 8. After the injection valve 5 is closed and the sealant solidifies, a double sealing structure of rubber ring 8 and sealant is formed, thus achieving a leak-proof effect.

[0048] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A leak-sealing structure suitable for flange threads, characterized in that, The device includes a ring-shaped and coaxially arranged plugging clamp (4), a push rod body (6), a piston (7), and a rubber ring (8). The upper surface of the plugging clamp (4) has a recessed receiving groove (46). The piston (7) and the rubber ring (8) are located in the receiving groove (46), and the rubber ring (8) is located above the piston (7). The plugging clamp (4) is sleeved around the sleeve (2) and fixed on the sleeve (2). The plugging clamp (4) is located below the flange (1), and the upper surface of the plugging clamp (4) is in close contact with the flange (1). The lower surface of the plugging clamp (4) has a push rod hole (45) that leads vertically to the receiving groove (46). The push rod body (6) is inserted into the push rod hole (45) and threadedly engaged with the push rod hole (45). The top end of the push rod body (6) abuts against the piston (7).

2. The leak-sealing structure for flange threads according to claim 1, characterized in that, The lower surface of the plugging fixture (4) is provided with a plurality of push rod holes (45), and all the push rod holes (45) are evenly distributed around the axis of the plugging fixture (4).

3. The leak-sealing structure for flange threads according to claim 1, characterized in that, The leak-sealing clamp (4) includes a convex clamp (41) and a concave clamp (42), which are spliced ​​together to form the leak-sealing clamp (4).

4. The leak-sealing structure for flange threads according to claim 1 or 3, characterized in that, The plugging clamp (4) also includes anti-slip fixing teeth (43), which are disposed on the inner wall of the plugging clamp (4) in contact with the sleeve (2).

5. The leak-sealing structure for flange threads according to claim 1, characterized in that, The top surface of the piston (7) is inclined, the outer side of the top surface of the piston (7) is higher than the inner side, the bottom surface of the rubber ring (8) is adapted to the top surface of the piston (7), the top surface of the rubber ring (8) is horizontal, and the side of the rubber ring (8) that contacts the sleeve (2) is vertical.

6. The leak-sealing structure for flange threads according to claim 1 or 5, characterized in that, The radial dimensions of the piston (7) and the rubber ring (8) are adapted to the radial dimensions of the receiving groove (46).

7. The leak-sealing structure for flange threads according to claim 1, characterized in that, It also includes a glue injection valve (5), and the plugging clamp (4) is also provided with a glue injection hole (44), the glue injection hole (44) leads to the receiving groove (46), and the glue injection valve (5) is inserted and fixed in the glue injection hole (44).

8. The leak-sealing structure for flange threads according to claim 7, characterized in that, The sealing fixture (4) is provided with two or more glue injection holes (44), which are distributed at intervals on the sealing fixture (4).

9. The leak-sealing structure for flange threads according to claim 8, characterized in that, The lower surface of the sealing fixture (4) is provided with a plurality of top rod holes (45), all of which are evenly distributed around the axis of the sealing fixture (4), and the glue injection hole (44) is located between two adjacent top rod holes (45) in the vertical direction.

10. The leak-sealing structure for flange threads according to claim 3, characterized in that, The piston (7) is made up of two semi-circular rings joined together, and the rubber ring (8) has a slit in the circumferential direction that can unfold the rubber ring (8).

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