Buffer type blocking valve

Abstract

The utility model discloses a buffering type blocking valve which comprises a blocking valve body, a blocking valve lower connector and a pressing cap which are sequentially connected in a sealed mode, through holes are coaxially formed in the blocking valve body and the blocking valve lower connector in a penetrating mode, and a plug is arranged in the through hole of the blocking valve lower connector. The plug is fixed to the end, away from the pressing cap, in the lower plug valve connector through a shear pin arranged on the lower plug valve connector. Buffer pads and strong magnetic blocks are arranged at one end, close to the pressing cap, of the plug and in the pressing cap; according to the utility model, the buffer pad is arranged between the plug and the pressing cap, and the strong magnetic block is arranged at the bottom of the plug and at the position corresponding to the pressing cap, so that the plug can be effectively fixed in the pressing cap, and when the plug is broken through, the water hammer effect generated by collision and the phenomenon of jumping and collision of the plug are avoided; by arranging the pressure testing plug, the pressure testing and replacement of the on-site wellhead device can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead plugging in the oil and gas industry, specifically, a buffer type plug valve. Background Art

[0002] In wellhead plugging work, a plug valve is lowered into the tubing or tubing hanger to block the passage of well fluid and ensure well control safety at the construction site. When the existing plug valve is circulated after plugging by punching through the plug, the plug and the gland collide violently, which is likely to cause a water hammer effect; at the same time, since the plug is not fixed between the gland and the lower joint, during the well fluid circulation, due to the flow of the well fluid, the plug bounces back and forth between the gland and the lower joint, posing certain safety hazards. Content of the Utility Model

[0003] The purpose of the utility model is to provide a buffer type plug valve, which is used to solve the technical problem that the plug bounces back and forth in the lower joint and impacts the gland in the prior art, easily generating safety hazards.

[0004] The utility model solves the above problems through the following technical solutions:

[0005] A buffer type plug valve includes: a plug valve body, a plug valve lower joint and a gland which are sequentially sealed and connected. A through hole is coaxially and communicatively arranged in the plug valve body and the plug valve lower joint. A plug is arranged in the through hole of the plug valve lower joint; the plug is fixed to one end of the plug valve lower joint away from the gland through a shear pin arranged on the plug valve lower joint; buffer pads and strong magnetic blocks are arranged at one end of the plug close to the gland and inside the gland. During operation, when the pump is started, the plug shears the shear pin, and after the plug is penetrated, it avoids the impact with the buffer pad on the gland, and the plug and the gland are fixed through the magnetic attraction of the strong magnetic block.

[0006] As a further improvement, it includes: the plug abuts against the end of the plug valve body.

[0007] As a further improvement, installation notches are oppositely formed at one end of the plug close to the gland and inside the gland, buffer pads are arranged in the installation notches, and strong magnetic blocks are arranged in a wrapped manner inside the buffer pads.

[0008] As a further improvement, a counterbore hole matched with a fixing bolt is arranged in each of the strong magnetic blocks to install the strong magnetic blocks through the fixing bolt.

[0009] As a further improvement, the strong magnetic blocks are circular rings; the buffer pads are barrel-shaped structures with lugs, and the inner sides of the lugs are in contact with the sides of the strong magnetic blocks.

[0010] As a further improvement, a pressure test plug for pressure testing the on-site wellhead device is also arranged inside the plug valve body.

[0011] As a further improvement, one end of the pressure test plug close to the plug is fitted into the inside of the plug valve body, and a number of O-ring seals are embedded on the outer wall of the pressure test plug.

[0012] As a further improvement, a blind hole is formed at the end of the pressure test plug away from the plug; there is a certain gap between the side of the pressure test plug away from the plug and the inner wall of the through hole in the plug valve body, and two pressure relief through holes communicating with the blind hole are formed to realize reverse flow pressure relief.

[0013] As a further improvement, the buffer pad is made of HNBR material coated with a steel wire mesh.

[0014] As a further improvement, the lower joint of the plug valve is fixed to both the compression nut and the plug valve body by set screws, and a number of O-ring seals are provided between the lower joint of the plug valve and the plug valve body.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] By installing a buffer pad between the plug and the compression nut, and installing strong magnetic blocks at the corresponding positions at the bottom of the plug and the compression nut, the plug can be effectively fixed in the compression nut. When the plug is opened, the water hammer effect caused by impact and the phenomenon of the plug jumping and hitting are avoided. A sealing structure is provided in multiple places, and by setting a pressure test plug, the pressure test and replacement of the on-site wellhead device can be satisfied, and the maximum pressure can reach 105 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a buffer type plug valve during the operation of the utility model;

[0018] Figure 2 is a schematic structural diagram of a buffer type plug valve after the operation of the utility model is completed.

[0019] Reference numerals:

[0020] 1. Plug valve body; 2. Lower joint of plug valve; 3. Compression nut; 4. Plug; 5. Shearing pin; 6. First strong magnetic block; 7. First buffer pad; 8. Second strong magnetic block; 9. Second buffer pad; 10. Set screw; 11. S seal ring; 12. BPV thread; 13. Pressure test plug; 14. O-ring seal; 15. Flow guiding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment

[0023] Combined with the attached Figure 1-2 As shown, a buffer type plug valve includes: a plug valve body 1, a lower joint 2 of the plug valve, and a gland 3 that are sequentially and sealingly connected. A through hole is coaxially and communicatively arranged in the plug valve body 1 and the lower joint 2 of the plug valve. A plug 4 is arranged in the lower joint 2 of the plug valve; the plug 4 is fixed in the lower joint 2 of the plug valve through a shear pin 5 radially arranged in the lower joint 2 of the plug valve and abuts against the plug valve body 1; a first installation notch is formed at one end of the plug 4 close to the gland 3. A first buffer pad 7 is arranged in the first installation notch. A first strong magnetic block 6 is arranged inside the first buffer pad 7. A counterbore is arranged in the first strong magnetic block 6. A fixing bolt passes through the counterbore and the first buffer pad 7 and is threadedly connected to one end of the plug 4 close to the gland 3; correspondingly, a second installation notch is formed in the gland 3. A second buffer pad 9 is arranged in the second installation notch. A second strong magnetic block 8 is arranged inside the second buffer pad 9. A counterbore is arranged in the second strong magnetic block 8. A fixing bolt passes through the counterbore and the second buffer pad 9 and is threadedly connected to the internal thread of the gland 3; and the opposite surfaces of the first strong magnetic block 6 and the second strong magnetic block 8 are respectively the N pole and the S pole, so that when starting the pump, the plug 4 cuts the shear pin 5. After the plug 4 penetrates, the buffer pads on the gland 3 avoid the impact. At the same time, the two strong magnetic blocks of the first strong magnetic block 6 and the second strong magnetic block 8 attract each other to fix the plug 4 and the gland 3, and the impact force of the plug 4 is reduced through the first buffer pad 7 and the second buffer pad 9.

[0024] Preferably, the first buffer pad 7 and the second buffer pad 9, that is, the buffer pads, are made of HNBR material coated with a wire mesh.

[0025] When using this buffer type plug valve to open the plug 4, a buffer pad is installed between the plug 4 and the gland 3, and strong magnetic blocks are installed at the corresponding positions at the bottom of the plug 4 and the gland 3, which can effectively fix the plug 4 and the gland 3, avoiding the water hammer effect caused by the impact and the phenomenon of the plug 4 jumping and hitting.

[0026] Specifically, the second strongest magnet block 8 is arranged with the same shape and structure as the first strongest magnet block 6, and the first buffer pad 7 is arranged with the same shape and structure as the second buffer pad 9. Now, an example is given: the first strongest magnet block 6 is in an annular shape, and the first buffer pad 7 is in a barrel structure. The outer side of the lug of the barrel structure is flush with the outer wall of the plug 4, and the inner side of the lug is in contact with the side surface of the first strongest magnet block 6, so as to wrap the first strongest magnet block 6 except for the contact surface with the second strongest magnet block 8 through the first buffer pad 7, and reduce the impact force between the first strongest magnet block 6 and the second strongest magnet block 8.

[0027] Furthermore, a pressure test plug 13 is also arranged in the plugging valve body 1. The pressure test plug 13 can meet the requirements of on-site wellhead device pressure test and replacement, and the maximum pressure can reach 105 MPa. Specifically, the end of the pressure test plug 13 close to the plug is fitted into the stepped through hole in the plugging valve body 1, and several O-ring seals are embedded on the outer wall of the pressure test plug 13, so as to seal and close the inside of the plugging valve body 1 through the pressure test plug 13; a blind hole matching with a special tool is formed at the end of the pressure test plug 13 far from the plug, and two pressure relief through holes communicating with the blind hole are formed on the opposite side surfaces. There is a certain gap between the outer surface of the pressure test plug 13 far from the plug and the inner wall of the through hole in the plugging valve body 1, so as to cooperate with one end of the special tool with the blind hole of the pressure test plug 13 by means of thread or other matching methods to take and place the pressure test plug 13; and when the special tool is connected with the blind hole, the two pressure relief through holes communicating with the blind hole are used to reverse flow and relieve pressure in the blind hole; of course, the special tool can also take and place the pressure test plug 13 in other ways, and the present invention does not limit this.

[0028] An external BPV thread 12 matching with the tubing hanger and an S seal ring 11 for sealing the tubing hanger are also formed outside the plugging valve body 1.

[0029] Furthermore, the lower joint 2 of the plugging valve is fixed to both the compression nut 3 and the plugging valve body 1 through set screws 10, and several O-ring seals 14 are arranged between the lower joint 2 of the plugging valve and the plugging valve body 1 for sealing. A radial pin hole is arranged on the outer wall of the plug 4, and the shear pin 5 is telescopically arranged in the lower joint 2 of the plugging valve, and the pin of the shear pin 5 is inserted into the pin hole, so as to fix the plug 4 at one end close to the plugging valve body 1 through the shear pin 5; after the wellhead operation of disassembly and replacement is completed, by applying pressure, the plug 4 cuts off the pin of the shear pin 5, and the plug 4 can move downward to below the diversion groove 15 of the lower joint 2 of the plugging valve.

[0030] In order to improve the sealing performance of the plugging valve and ensure smooth downward movement during the lowering operation, the compression nut 3 is arranged to cover one end of the lower joint 2 of the plugging valve, and the other end of the lower joint 2 of the plugging valve is arranged to cover the plugging valve body 1.

[0031] A buffer type plug valve of the utility model is installed on the BPV thread of the tubing hanger during operation. After the operation is completed, first use a special tool to remove the pressure test plug, and then start the pump to cut the shear pin of the plug. After the plug is penetrated, the buffer pad on the compression nut avoids impact, and at the same time, two strong magnetic blocks attract each other to firmly fix the plug. By installing a buffer pad between the plug and the compression nut, and installing strong magnetic blocks at the corresponding positions at the bottom of the plug and the compression nut, the plug can be effectively fixed in the compression nut. When the plug is opened, the water hammer effect caused by impact and the phenomenon of the plug jumping and hitting are avoided.

[0032] Although the present utility model has been described herein with reference to illustrative embodiments thereof, the above embodiments are only the preferred embodiments of the present utility model. The embodiments of the present utility model are not limited by the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, and these modifications and embodiments will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A buffer type plug valve, characterized in that: include: The plugging valve body, the lower joint of the plugging valve and the pressure cap are sealed and connected in sequence. The plugging valve body and the lower joint of the plugging valve are coaxially connected with through holes, and a plug is arranged in the through hole of the lower joint of the plugging valve; the plug is fixed to the end of the lower joint of the plugging valve away from the pressure cap by shear nails arranged in the lower joint of the plugging valve; a buffer pad and a strong magnetic block are arranged at the end of the plug close to the pressure cap and in the pressure cap. When operating, the pump is started to make the plug shear the shear nails, and after the plug is penetrated, it avoids impact with the buffer pad on the pressure cap, and the plug and the pressure cap are fixed by the magnetic attraction of the strong magnetic block.

2. A buffer type plug valve according to claim 1, characterized in that: include: The plug abuts against the end of the plug valve body.

3. A buffer type plug valve according to claim 1, characterized in that: The plug is provided with mounting notches at one end close to the pressure cap and in the pressure cap. A buffer pad is provided in the mounting notch, and a strong magnetic block is covered in the buffer pad.

4. A buffer type plugging valve according to claim 3, characterized in that: The strong magnetic blocks are each provided with a countersunk hole matched with a fixing bolt, so that the strong magnetic blocks can be installed by the fixing bolt.

5. A buffer type plug valve according to claim 3, characterized in that: The strong magnetic block is in a ring shape; the buffer pad is a barrel-shaped structure with lugs, and the inner side of the lugs is in contact with the side surface of the strong magnetic block.

6. A buffer type plug valve according to claim 1, characterized in that: The plug valve body is also provided with a pressure testing plug for testing the pressure of the on-site wellhead device.

7. A buffer type plug valve according to claim 6, characterized in that: The end of the pressure test plug close to the plugging is embedded in the plug valve body, and a plurality of O-type sealing rings are embedded on the outer wall of the pressure test plug.

8. A buffer type plugging valve according to claim 6, characterized in that: A blind hole is formed at the end of the pressure test plug away from the plugging; there is a certain gap between the side of the end of the pressure test plug away from the plugging and the inner wall of the through hole in the plugging valve body, and two pressure relief through holes connected to the blind hole are formed to achieve backflow pressure relief.

9. A buffer type plug valve according to claim 1, characterized in that: The buffer pad is made of HNBR material coated with steel wire mesh.

10. A buffer type plugging valve according to any one of claims 1 to 9, characterized in that: The lower joint of the plugging valve is fixed to the pressure cap and the plugging valve body by means of set screws, and a plurality of O-type sealing rings are arranged between the lower joint of the plugging valve and the plugging valve body.

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