A downhole accessory push-to- valve

Abstract

The application provides a downhole accessory push-to-exist valve, which comprises a valve seat matched with a valve ball, a basket with a channel communicated with the valve seat in the interior, and a holder arranged in the channel, wherein a first magnet is arranged at a first end of the holder, and a second magnet magnetically repulsive to the first magnet is arranged in the interior of the channel; the valve ball can abut against a second end of the holder and push the holder to move along the channel, so that the first magnet gradually approaches the second magnet; under the action of the magnetic repulsive force, the first magnet can gradually move away from the second magnet, and the holder pushes the valve ball to move and enter the valve seat.

Description

Technical Field

[0001] This invention relates to the field of downhole tools for drilling, and more specifically, to a downhole accessory push valve. Background Technology

[0002] Downhole push valves typically use mechanical compression springs (e.g., helical springs) to control valve opening and closing. When drilling fluid pressure pushes the valve core, the spring is compressed; when the pressure decreases, the spring rebounds and closes the valve. Because mechanical compression springs have a compression limit, the actual effective stroke is short, reducing valve response efficiency. Furthermore, long-term exposure to fluid corrosion and cyclic stress makes the spring prone to breakage and failure. Additionally, the frictional vibration generated by the mechanical contact between the spring and the valve body affects sealing performance and equipment stability. Summary of the Invention

[0003] One objective of this invention is to provide a downhole accessory push valve that utilizes the repulsive magnetic force between two magnets of the same pole to replace the mechanical elastic force of the spring in a traditional push valve, thereby achieving contactless valve actuation, reducing stroke loss and mechanical wear. The repulsive magnetic force between the two magnets of the same pole is a constant restoring force, which can improve the sealing accuracy and lifespan of the push valve.

[0004] According to the present invention, a downhole accessory push valve is provided, comprising: a valve seat that cooperates with a valve ball, a basket having an internal channel communicating with the valve seat, and a support disposed within the channel. A first magnet is disposed at a first end of the support, and a second magnet that is opposite to and magnetically repulsive to the first magnet is disposed inside the channel. The valve ball is capable of abutting against a second end of the support and pushing the support to move along the channel, so that the first magnet gradually approaches the second magnet. Under the action of magnetic repulsion, the first magnet can gradually move away from the second magnet, and the support pushes the valve ball to move and enter the valve seat.

[0005] In a preferred embodiment, the support includes a ball holder disposed at a second end of the support, the inner surface of the ball holder being able to abut against the valve ball, and the outer side wall of the ball holder abutting against the inner wall forming the channel.

[0006] In a preferred embodiment, the support further includes: a limiting guide rod with its first end connected to the side of the ball support away from the valve ball, the second end of the limiting guide rod having a notch, and the first magnet being disposed within the notch.

[0007] In a preferred embodiment, the first end of the limiting guide rod is integrally formed with the ball support.

[0008] In a preferred embodiment, the channel includes: an expanding channel that internally accommodates the ball holder, the inner wall of the expanding channel contacting the outer wall of the ball holder.

[0009] In a preferred embodiment, the channel includes: a limiting channel communicating with the expanding channel, the diameter of the expanding channel being larger than the diameter of the limiting channel, the second end of the limiting guide rod being disposed inside the limiting channel, and the diameter of the limiting channel being the same as the outer diameter of the limiting guide rod.

[0010] In a preferred embodiment, the flower basket has air holes in the wall forming the channel.

[0011] In a preferred embodiment, the flower basket extends from the wall forming the outwardly expanding channel toward the valve seat via a connecting wall that contacts and is fixed to the outer wall of the valve seat.

[0012] In a preferred embodiment, the downhole accessory push valve further includes: a base with a first end inserted into the end of the limiting channel, the first end of the base having a recess, and a second magnet disposed in the recess.

[0013] In a preferred embodiment, the connecting wall is fixedly connected to the outer wall of the valve seat by a threaded connection.

[0014] This invention has at least the following technical effects: According to the present invention, the repulsive magnetic force between two magnets of the same pole replaces the mechanical elastic force of the spring in the traditional push valve, realizing contactless valve actuation, reducing stroke loss and mechanical wear. The repulsive magnetic force between the two magnets of the same pole is a constant restoring force, which can improve the sealing accuracy and life of the push valve.

[0015] In addition, the repulsive magnetic force between the two magnets ensures that the valve responds quickly to close, reducing the risk of well fluid backflow; it also prevents foreign objects from getting stuck in the spring and causing it to fail to rebound. At the same time, since the first magnet reciprocates within the closed channel of the basket, it can prevent a large amount of metal debris generated during the downhole cleaning process from being adsorbed, thus improving downhole reliability. Because the magnets are made of nickel alloy, they are suitable for high temperature, high pressure and corrosive environments.

[0016] According to the present invention, the second end of the limiting guide rod is disposed inside the limiting channel, and the diameter of the limiting channel is the same as the outer diameter of the limiting guide rod. The limiting channel can restrict the limiting guide rod and the first magnet from moving axially and avoid radial displacement. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a downhole accessory push valve according to an embodiment of the present invention is shown. Figure 2 A schematic cross-sectional view of the support structure of a downhole accessory push valve according to an embodiment of the present invention is shown. Figure 3 A schematic diagram of the basket structure of a downhole accessory push valve according to an embodiment of the present invention is shown. Figure 4 A schematic diagram of the base of a downhole accessory push valve according to an embodiment of the present invention is shown.

[0018] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "outer" and "inner" 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 invention 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 limiting this invention.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] like Figure 1 As shown, the downhole accessory push valve 100 of the present invention includes: a valve seat 1-6 that cooperates with a valve ball 1-5; a basket 1-3 having an internal channel communicating with the valve seat 1-5; and a support 1-2 disposed within the channel. The basket 1-3 is disposed on the side of the valve seat 1-6, and the channel extends axially. A first magnet 1-1 is disposed at the first end of the support 1-2, and its second end can abut against the valve ball 1-5. A second magnet 1-7, which is opposite to the first magnet 1-1 and magnetically repelled, is disposed inside the channel. In the present invention, the downhole accessory can be a float band or a float shoe.

[0023] In the initial state, before being subjected to downhole mud or drilling fluid circulation pressure, there is a certain magnetic repulsion between the first magnet 1-1 and the second magnet 1-7, which keeps the valve ball 1-5 tightly against the valve seat 1-6 and achieves a seal. When the downhole mud or drilling fluid circulates to a certain pressure, it pushes the valve ball 1-5 away from the valve seat 1-6 and presses against the support 1-2, causing the support 1-2 to move axially downward in the channel, opening the push valve 100. During the axial downward movement of the support 1-2, the first magnet 1-1 moves closer to the second magnet 1-7, increasing the repulsion between the two magnets. If the pressure of the downhole mud or drilling fluid is insufficient to push the valve ball 1-5 further downward, the first magnet 1-1 moves axially upward under the action of the magnetic repulsion, gradually moving away from the second magnet 1-7, causing the support 1-2 to push the valve ball 1-5 until the valve ball 1-5 enters the valve seat 1-6, closing the push valve 100.

[0024] According to the present invention, the repulsive magnetic force between two magnets of the same pole replaces the mechanical elastic force of the spring in the traditional push valve, realizing contactless valve actuation, reducing stroke loss and mechanical wear. The repulsive magnetic force between the two magnets of the same pole is a constant restoring force, which can improve the sealing accuracy and life of the push valve.

[0025] In addition, the repulsive magnetic force between the two magnets ensures that the valve responds quickly to close, reducing the risk of well fluid backflow; it also prevents foreign objects from getting stuck in the spring, causing it to be unable to rebound. At the same time, since the first magnet 1-1 reciprocates within the closed channel of the basket 1-3, it can prevent a large amount of metal debris generated during the downhole cleaning process from being adsorbed, thus improving downhole reliability. Since the magnets are made of nickel alloy, they are suitable for high temperature, high pressure and corrosive environments.

[0026] like Figure 2 As shown, in one or more embodiments, the support 1-2 includes: a ball support 2-1 disposed at the second end of the support 1-2, the inner surface of the ball support 2-1 being able to abut against the valve ball 1-5, and the outer wall of the ball support 2-1 abutting against the inner wall of the support 1-2 forming a channel.

[0027] In one or more embodiments, the support 1-2 further includes a limiting guide rod 2-2 connected to the side of the ball support 2-1 away from the valve ball 1-5. Optionally, the end of the limiting guide rod 2-2 is integrally formed with the ball support 2-1. The other end of the limiting guide rod 2-2 is provided with a notch 2-3, and the first magnet 1-1 is fixedly disposed in the notch 2-3.

[0028] In one or more embodiments, the channel includes: an expanding channel 3-3 and a limiting channel 3-4 communicating with the expanding channel 3-3, wherein the diameter of the expanding channel 3-3 is larger than the diameter of the limiting channel 3-4. A ball holder 2-1 is disposed inside the expanding channel 3-3, and its outer wall contacts the inner wall of the expanding channel 3-3. The second end of the limiting guide rod 2-2 is disposed inside the limiting channel 3-4, and the diameter of the limiting channel 3-4 is the same as the outer diameter of the limiting guide rod 2-2. The limiting channel 3-4 can restrict the axial movement of the limiting guide rod 2-2 and the first magnet 1-1, preventing radial displacement.

[0029] In one or more embodiments, the basket 1-3 has vents 3-2 on the wall forming the channel, allowing some of the gas generated inside the channel to be discharged through the vents 3-2 during reciprocating motion. Optionally, the vents 3-2 are formed on the wall forming the limiting channel 3-4.

[0030] like Figure 3 As shown, in one or more embodiments, the basket 1-3 extends from the wall forming the outwardly expanding channel 3-3 toward the valve seat 1-6 via a connecting wall 3-1, which contacts and is fixedly connected to the outer wall of the valve seat 1-6. Optionally, the connecting wall 3-1 is fixedly connected to the outer wall of the valve seat 1-6 via a threaded connection.

[0031] like Figure 4 As shown, in one or more embodiments, the downhole accessory push valve 100 of the present invention further includes: a base 1-4 with its first end inserted into the end of the limiting channel 3-4, the first end of the base 1-4 having a recess, and a second magnet 1-7 fixedly disposed in the recess.

[0032] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A downhole accessory push valve, comprising: A valve seat that cooperates with a valve ball, a basket having a channel communicating with the valve seat, and a support set in the channel, wherein a first magnet is provided at the first end of the support and a second magnet that is opposite to and magnetically repulsive to the first magnet is provided inside the channel; The valve ball can abut against the second end of the support and push the support to move along the channel so that the first magnet gradually approaches the second magnet; under the action of magnetic repulsion, the first magnet can gradually move away from the second magnet, and the support pushes the valve ball to move and enter the valve seat.

2. The downhole accessory push valve according to claim 1, characterized in that, The support includes a ball holder disposed at the second end of the support, wherein the inner surface of the ball holder is capable of abutting against the valve ball, and the outer side wall of the ball holder abuts against the inner wall forming the channel.

3. The downhole accessory push valve according to claim 2, characterized in that, The support also includes: a limiting guide rod whose first end is connected to the side of the ball support away from the valve ball, and a notch is provided at the second end of the limiting guide rod, with the first magnet disposed in the notch.

4. The downhole accessory push valve according to claim 3, characterized in that, The first end of the limiting guide rod is integrally formed with the ball support.

5. The downhole accessory push valve according to any one of claims 1 to 3, characterized in that, The channel includes: an expanding channel that internally accommodates the ball holder, the inner wall of the expanding channel being in contact with the outer wall of the ball holder.

6. The downhole accessory push valve according to claim 5, characterized in that, The channel includes: a limiting channel communicating with the expanding channel, wherein the diameter of the expanding channel is larger than the diameter of the limiting channel, the second end of the limiting guide rod is disposed inside the limiting channel, and the diameter of the limiting channel is the same as the outer diameter of the limiting guide rod.

7. The downhole accessory push valve according to claim 5, characterized in that, The flower basket has air holes in the wall forming the channel.

8. The downhole accessory push valve according to claim 5, characterized in that, The flower basket extends from the wall forming the outward expansion channel toward the valve seat via a connecting wall, which contacts and is fixed to the outer wall of the valve seat.

9. The downhole accessory push valve according to claim 5, characterized in that, Also includes: The first end is inserted into the base at the end of the limiting channel, and the first end of the base has a recess, in which the second magnet is disposed.

10. The downhole accessory push valve according to claim 8, characterized in that, The connecting wall is fixedly connected to the outer wall of the valve seat by a threaded connection.

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