Multi-seal dual-plate float valve

Abstract

The utility model relates to a kind of multi-sealing double-plate float valve, it includes valve body (1) and valve core (2), the through hole of valve core (2) is separated by upper valve plate (21) and lower valve plate (22) in one above another, one side of upper valve plate (21) and lower valve plate (22) is respectively hinged on the side wall of valve core (2) by pin shaft (23), pin shaft (23) is equipped with torsion spring (24), one end of which is matched with valve core (2), the other end is matched with upper valve plate (21) and lower valve plate (22).It is better in sealing effect, can more effectively prevent well surge and blowout. It adds a valve plate on the valve core, when one valve plate loses effect, the other valve plate can also play a sealing role, which can not hinder the normal circulation of mud, can also reduce the occurrence of well surge or blowout accident, and greatly improve the service life of tool. When tripping operation, it can still prevent the backflow of drilling fluid, prevent silt from entering the drill string, and play a role in preventing blockage.

Description

Technical Field

[0001] This utility model relates to petroleum tools, specifically to a double-plate float valve with multiple sealing functions. Background Technology

[0002] A float valve is an internal blowout preventer used in drilling operations to effectively prevent well blowouts. Commonly used plate-type float valves have only one valve plate. Under the scouring action of drilling fluid, the sealing effect of the valve plate often decreases. With the continuous scouring of downhole fluid, the sealing effect will become worse and worse until a well kick and blowout occur. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-seal double-plate float valve with better sealing performance, which can effectively prevent blowouts.

[0004] The technical solution of this utility model is as follows: It includes a valve body and a valve core. The valve body and the valve core are respectively provided with through holes at their axial centers. The valve core is installed in the through hole of the valve body. The outer wall of the valve core and the inner wall of the through hole of the valve body are sealed together. An upper valve plate and a lower valve plate are provided in the through hole of the valve core, spaced apart from each other. One side of the upper valve plate and the lower valve plate are respectively hinged to the side wall of the valve core by a pin. A torsion spring is fitted on the pin, with one end cooperating with the valve core and the other end cooperating with the upper valve plate and the lower valve plate. The upper valve plate and the lower valve plate flip downward against the elastic force of the torsion spring to open the valve core through hole. Under the action of the elastic force of the torsion spring, they flip upward to seal and close the valve core through hole.

[0005] The technical advantages of this invention are: it provides a better sealing effect, more effectively preventing well kicks and blowouts. By adding a valve plate to the valve core, the other valve plate can still provide a seal even if one valve plate fails, thus not hindering the normal circulation of drilling mud, reducing the occurrence of well kicks or blowouts, and significantly extending the tool's service life. During tripping operations, it still prevents drilling fluid backflow and blocks mud and sand from entering the drill string, thus preventing blockages. Attached Figure Description

[0006] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present utility model. Detailed Implementation

[0007] like Figure 1As shown, it includes a valve body 1 and a valve core 2. The valve body 1 and the valve core 2 are respectively provided with through holes at their axial centers. The valve core 2 is installed in the through hole of the valve body 1. The outer wall of the valve core 2 is sealed to the inner wall of the through hole of the valve body 1. An upper valve plate 21 and a lower valve plate 22 are provided in the through hole of the valve core 2, spaced apart from each other. One side of the upper valve plate 21 and the lower valve plate 22 are respectively hinged to the side wall of the valve core 2 by a pin 23. A torsion spring 24 is fitted on the pin 23, with one end cooperating with the valve core 2 and the other end cooperating with the upper valve plate 21 and the lower valve plate 22. The upper valve plate 21 and the lower valve plate 22 flip downward to open the through hole of the valve core 2 against the elastic force of the torsion spring 24, and flip upward under the action of the elastic force of the torsion spring 24 to seal and close the through hole of the valve core 2.

[0008] The outer wall of the valve core 1 above the upper valve plate 21 and the lower valve plate 22 is provided with sealing ring grooves in the circumferential direction, and each sealing ring groove is equipped with an O-ring 3 that seals with the inner wall of the through hole of the valve body 1.

[0009] The upper end of the valve body 1 is provided with an internal thread 11 for pipe connection, and the lower end is provided with an external thread 12 for pipe connection.

[0010] The valve core 2 is installed from top to bottom in the through hole of the valve body 1. The valve core 2 is provided with an upward-facing inner end face 13 in the through hole of the valve body 1 below the valve core 2, which matches the periphery of the lower end face of the valve core 2 and plays a downward limiting role for the valve core 2. The tubing is installed on the upper end of the valve body 1 by threads, and the lower end face of the tubing plays an upward limiting role for the valve core 2.

[0011] Torsion spring 24 is a double-arm torsion spring.

[0012] Sealing sleeves 25 are provided in the through hole of valve core 2 at the positions that seal with upper valve plate 21 and lower valve plate 22. Sealing sleeves 25 are tightly fitted in sealing sleeve grooves 26 in the through hole of valve core 2. Sealing gasket grooves 27 are provided on the inner end face of valve core 2 facing downward outside the sealing sleeves 25. Sealing gaskets 28 that seal with upper valve plate 21 and lower valve plate 22 are installed in the sealing gasket grooves 27.

[0013] The cross-sections of the sealing gasket groove 27 and the sealing gasket 28 are L-shaped.

[0014] The lower edge of the sealing gasket 27 protrudes downward to the bottom of the sealing gasket groove and the sealing sleeve 25, and cooperates with the upper valve plate 21 and the lower valve plate 22 to perform a sealing function.

[0015] Working principle:

[0016] During drilling, under the scouring of mud and drilling fluid, the valve plates first overcome the elastic force of the torsion spring 24 of the upper valve plate 21 to open downwards. Mud and drilling fluid then pass through the upper valve plate 21 and enter between the upper valve plate 21 and the lower valve plate 22. Then, overcoming the elastic force of the torsion spring 24 of the lower valve plate 22, the lower valve plate 22 opens. After both valve plates are open, the drilling passage is fully open, ensuring normal circulation of mud and drilling fluid, allowing for normal drilling operations.

[0017] When a well kick or blowout occurs at the bottom of the well, the drilling rig pressure gauge displays the pressure at the bottom of the well, controlling the drilling rig to stop the pump. The mud and drilling fluid pressures decrease, and the upper valve plate 21 and lower valve plate 22, under the action of the torsion spring 24, flip upwards and close until they contact the sealing gasket 28 to achieve a seal. The sealing gasket 28 is supported by the sealing sleeve 25. The pressure from the well kicking up from the bottom of the well first acts on the lower valve plate 22, which compresses the sealing gasket 28 to form an effective seal. The upper valve plate 21 then serves as a backup seal; at this time, the channel above the lower valve plate 22 is not subjected to pressure from the bottom of the well, and all the pressure from the bottom of the well acts on the lower valve plate 22. If the seal of the lower valve plate 22 fails, the pressure will then act on the upper valve plate 21, which will then continue to perform the sealing task. This buys valuable time to resolve the blowout or kick.

[0018] Instructions for use and safety precautions:

[0019] A pressure test should be performed before use;

[0020] During use, the tool should be regularly inspected for sealing performance and flaw detection. If the sealing components are damaged, they should be replaced and a pressure test should be performed again.

[0021] When connecting a multi-seal double-plate float valve, care should be taken to ensure that the valve core is installed in the correct direction. The correct installation direction is that the valve core opens when the drilling fluid flows downward and closes when it flows upward.

[0022] Maintenance and upkeep:

[0023] After the tools are used, they are sent to the pipe station (workshop) for disassembly, inspection, cleaning, oiling, and reinstallation (replacing with new sealing rings).

[0024] After reinstallation, a clean water pressure test was conducted;

[0025] After the pressure test is passed, drain the water from the inside.

[0026] Apply anti-rust and anti-corrosion grease to the threaded areas, then install it and store it in a well-ventilated and dry place for future use.

Claims

1. A multi-seal double-plate float valve, comprising a valve body (1) and a valve core (2), wherein the axial center of the valve body (1) and the valve core (2) are respectively provided with through holes, the valve core (2) is installed in the through hole of the valve body (1), and the outer wall of the valve core (2) is sealed to the inner wall of the through hole of the valve body (1), characterized in that: The valve core (2) has an upper valve plate (21) and a lower valve plate (22) spaced apart in the through hole. One side of the upper valve plate (21) and the lower valve plate (22) are respectively hinged to the side wall of the valve core (2) by a pin (23). A torsion spring (24) is fitted on the pin (23), with one end cooperating with the valve core (2) and the other end cooperating with the upper valve plate (21) and the lower valve plate (22). The upper valve plate (21) and the lower valve plate (22) overcome the elastic force of the torsion spring (24) and flip downward to open the through hole of the valve core (2). Under the action of the elastic force of the torsion spring (24), they flip upward to seal and cooperate with the valve core (2) to close the through hole of the valve core (2).

2. The multi-seal double-plate float valve as described in claim 1, characterized in that... The valve core (2) located above the upper valve plate (21) and the lower valve plate (22) has a sealing ring groove on its outer wall in the circumferential direction. Each sealing ring groove is equipped with an O-ring (3) that seals against the inner wall of the through hole of the valve body (1).

3. The multi-seal double-plate float valve as described in claim 1, characterized in that... The valve body (1) has an internal thread (11) for connecting the pipe column at the upper end and an external thread (12) for connecting the pipe column at the lower end.

4. The multi-seal double-plate float valve as described in claim 1, characterized in that... The valve core (2) is installed from top to bottom in the through hole of the valve body (1). The valve body (1) below the valve core (2) has an inner end face (13) facing upward that matches the periphery of the lower end face of the valve core (2), which limits the valve core (2) downward.

5. The multi-seal double-plate float valve as described in claim 1, characterized in that... The torsion spring (24) is a double-arm torsion spring.

6. The multi-seal double-plate float valve as described in claim 1, characterized in that... The valve core (2) is provided with sealing sleeves (25) at the positions where it seals with the upper valve plate (21) and the lower valve plate (22). The sealing sleeves (25) are tightly fitted in the sealing sleeve grooves (26) provided in the valve core (2) through holes. The valve core (2) on the outer side of the sealing sleeves (25) is provided with sealing gasket grooves (27) facing downwards. The sealing gasket grooves (27) are provided with sealing gaskets (28) that seal with the upper valve plate (21) and the lower valve plate (22).

7. The multi-seal double-plate float valve as described in claim 6, characterized in that... The cross-sections of the sealing groove (27) and the sealing gasket (28) are L-shaped.

8. The multi-seal double-plate float valve as described in claim 6, characterized in that... The lower part of the sealing gasket (28) protrudes downward to the bottom of the sealing gasket groove and the sealing sleeve (25), and cooperates with the upper valve plate (21) and the lower valve plate (22) to perform a sealing function.

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