A float valve

Abstract

The utility model provides a kind of float valve, comprising: valve body, with the shut-off valve and conical valve of valve body connection, the outer periphery of valve body is provided with pulp hole, and inside has the first overflow passage with the pulp hole communication, the shut-off valve core of shut-off valve is placed in the outer periphery of valve body and can close the pulp hole, shut-off valve core and valve body sliding connection, the conical valve core of conical valve is set in the bottom end of first overflow passage inside.The utility model can form the double-valve structure with different shape valve core by using shut-off valve and conical valve, and then can form double seal, to significantly reduce the risk of float valve failure.

Description

Technical Field

[0001] This utility model belongs to the field of well control facility technology, specifically, it relates to a float valve. Background Technology

[0002] In oil drilling, float valves are typically used to prevent backflow of drilling mud from the drill string due to downhole overflow, thereby ensuring well control safety. Existing float valves mainly include arrow-shaped float valves and baffle-type float valves. Because both use a single valve core and form a single seal, their sealing performance is poor. In actual use, due to mud fouling, detachment of the drill string's inner coating, barite precipitation, gravel, etc., arrow-shaped and baffle-type float valves frequently fail, posing a significant risk to well control safety at the drilling site. Utility Model Content

[0003] One objective of this invention is to propose a float valve that, by employing a shut-off valve and a cone valve, forms a dual-valve structure with valve cores of different shapes, thereby achieving a double seal and significantly reducing the risk of float valve failure.

[0004] According to this utility model, a float valve is provided, comprising: a valve body, a shut-off valve and a conical valve connected to the valve body, wherein the valve body is provided with a slurry passage hole on its outer periphery and has a first flow passage communicating with the slurry passage hole inside, the shut-off valve core is sleeved on the outer periphery of the valve body and can close the slurry passage hole, the shut-off valve core is slidably connected to the valve body, and the conical valve core is disposed in the bottom end of the first flow passage.

[0005] In a preferred embodiment, the conical valve includes: a valve stem connected to the bottom end of the conical valve core and arranged axially, and a conical valve spring is sleeved on the outer periphery of the valve stem.

[0006] In a preferred embodiment, the valve stem is centrally located inside the valve body.

[0007] In a preferred embodiment, the valve body includes: a first support sleeve fitted around the outer periphery of the valve stem, and an upper support frame integrally connected to the side of the first support sleeve away from the valve stem.

[0008] In a preferred embodiment, the top end of the conical valve spring is connected to the lower surface of the conical valve core, and the bottom end is connected to the upper support frame.

[0009] In a preferred embodiment, the valve body further includes: a second support sleeve fitted around the outer periphery of the valve stem, and a lower support frame integrally connected to the side of the second support sleeve away from the valve stem, the lower support frame being disposed at the lower part of the upper support frame and parallel to the upper support frame.

[0010] In a preferred embodiment, a conical valve limiting block is fixedly sleeved on the outer periphery of the valve stem, and the conical valve limiting block is located axially between the lower support frame and the upper support frame.

[0011] In a preferred embodiment, the valve stem is fitted with the conical valve spring on the segment between the lower support frame and the conical valve limiting block.

[0012] In a preferred embodiment, a limiting block extending radially outward is provided at the top of the valve body.

[0013] In a preferred embodiment, the bottom end of the first flow channel is configured as a conical surface adapted to the upper surface of the conical valve core.

[0014] This utility model has at least the following technical effects: According to this utility model, a valve body, a shut-off valve connected to the valve body, and a conical valve are provided. The valve body has a slurry passage hole on its outer periphery and a first flow channel communicating with the slurry passage hole inside. The shut-off valve core is fitted onto the outer periphery of the valve body and can seal the slurry passage hole. The shut-off valve core is slidably connected to the valve body so that the shut-off valve core can move axially. The conical valve core is disposed within the bottom end of the first flow channel. This utility model, by employing a shut-off valve and a conical valve, forms a dual-valve structure with valve cores of different shapes, thereby achieving a double seal and significantly reducing the risk of float valve failure.

[0015] Furthermore, compared to using two shut-off valves, this invention, by employing a shut-off valve and a cone valve arranged separately at the top and bottom, respectively, can shorten the tubing length and prevent pipe leakage. Moreover, since the shut-off valve has better shear resistance than the cone valve, placing the shut-off valve above the cone valve effectively protects the cone valve. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of a float valve according to an embodiment of the present invention is shown, wherein the float valve is in the closed state; Figure 2 A schematic diagram of a float valve according to an embodiment of the present invention is shown, wherein the float valve is in the open state.

[0017] In this application, all the accompanying drawings are schematic drawings, used only to illustrate the principle of the present invention, and are not drawn to scale. Detailed Implementation

[0018] The technical solution of this utility model 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 this utility model. 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.

[0019] In the description of the utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the utility model 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 the utility model.

[0020] In this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection 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 utility model according to the specific circumstances.

[0021] like Figures 1 to 2 As shown, this utility model provides a float valve 100 comprising: a valve body 1 disposed inside a tubular column, a shut-off valve and a conical valve connected to the valve body 1, wherein the shut-off valve is located at the upper part of the conical valve, the valve body 1 has a slurry passage hole 1-2 disposed on its outer periphery, and has a first flow passage a communicating with the slurry passage hole 1-2 inside, the shut-off valve core 2 of the shut-off valve is sleeved on the outer periphery of the valve body 1 and can close the slurry passage hole 1-2, and is slidably connected to the valve body 1, the conical valve core 4 of the conical valve is disposed in the bottom end of the first flow passage a, and is used to separate the first flow passage a and the second flow passage b, wherein the diameter of the second flow passage b is larger than the diameter of the first flow passage a. Optionally, the slurry passage hole 1-2 is disposed on the outer periphery of the valve body 1 near the top, and the shut-off valve core 2 of the shut-off valve is constructed in a cylindrical shape. Optionally, the bottom end of the first flow passage a is constructed as a conical surface adapted to the upper surface of the conical valve core.

[0022] When the pump stops, the shut-off valve closes, and the shut-off valve core 2 can seal the slurry passage hole 1-2. When the pump starts and a positive circulation is formed, the shut-off valve opens, and the shut-off valve core 2 can move axially downward under the action of external mud so that the slurry passage hole 1-2 is exposed. The first flow channel a is connected to the slurry passage hole 1-2. The mud enters the first flow channel a through the slurry passage hole 1-2 and flows inside the first flow channel a. When it flows to the bottom of the first flow channel a, it drives the cone valve core 4 of the cone valve to move axially downward. The second flow channel b is connected to the first flow channel a, and the mud can enter the second flow channel b from the first flow channel a.

[0023] According to this utility model, a valve body 1, a shut-off valve connected to the valve body 1, and a conical valve are provided. The valve body 1 has a slurry passage hole 1-2 on its outer periphery and a first flow passage a communicating with the slurry passage hole 1-2 inside. The shut-off valve core 2 is fitted around the valve body 1 and can seal the slurry passage hole 1-2. The shut-off valve core 2 is slidably connected to the valve body 1 so that the shut-off valve core 2 can move axially. The conical valve core 4 of the conical valve is disposed in the bottom end of the first flow passage a. This utility model, by employing a shut-off valve and a conical valve, forms a dual-valve structure with valve cores of different shapes, thereby achieving a double seal and significantly reducing the risk of float valve failure.

[0024] Furthermore, compared to using two shut-off valves, this invention, by employing a shut-off valve and a cone valve arranged separately at the top and bottom, respectively, can shorten the tubing length and prevent pipe leakage. Moreover, since the shut-off valve has better shear resistance than the cone valve, placing the shut-off valve above the cone valve effectively protects the cone valve.

[0025] In one or more embodiments, the conical valve includes: a valve stem 7 connected to the bottom end of the conical valve core 4 and arranged axially, with a conical valve spring 6 sleeved around the outer periphery of the valve stem 7. After the pump stops and the pressure inside the drill string water hole is equal to or less than the annular fluid column pressure, the conical valve spring 6 drives the conical valve core 4 to reset under the action of the rebound force and close the bottom end of the first flow passage a, thereby forming a first seal between the conical valve core 4 and the valve body 1, and simultaneously forming a pressure-assisted seal under pressure: when overflow occurs, the mud in the water hole flows back, the valve core 4 rebounds to close the passage; the seal formed by the valve core 4 and the valve body 1 can be pressed tighter under the pressure of the backflowing mud to achieve a pressure-assisted seal.

[0026] In one or more embodiments, the valve body 1 includes a receiving cavity surrounding the outer periphery of the pipe wall of the first flow channel a. The shut-off valve includes a shut-off valve spring 3 disposed within the receiving cavity, with its first end connected to the bottom end of the shut-off valve core 2, and its second end connected to the bottom surface of the receiving cavity. After the pump stops and the pressure inside the drill string's water hole is equal to or less than the annular fluid column pressure, the shut-off valve spring 3, under the action of its rebound force, drives the shut-off valve core 2 to reset and close the slurry passage 1-2, thereby forming a second seal between the shut-off valve core 2 and the valve body 1.

[0027] In one or more embodiments, the valve stem 7 is centrally located inside the valve body 1. In this embodiment, the valve body 1 includes: a first support sleeve fitted around the outer periphery of the valve stem 7; an upper support frame 1-3 integrally connected to the side of the first support sleeve away from the valve stem 7; the other end of the upper support frame 1-3 is integrally connected to the main body of the valve body 1; the first support sleeve and the upper support frame 1-3 together restrict the radial movement of the valve stem 7, allowing the valve stem 7 to move only axially. In this embodiment, the top end of the conical valve spring 6 is connected to the lower surface of the conical valve core 4, and the bottom end is connected to the upper support frame 1-3.

[0028] In one or more embodiments, the valve body 1 further includes: a second support sleeve fitted around the outer periphery of the valve stem 7; a lower support frame 1-4 integrally connected to the side of the second support sleeve away from the valve stem 7; the other end of the lower support frame 1-4 integrally connected to the main body of the valve body 1; and the lower support frame 1-4 being disposed below the upper support frame 1-3 and parallel to the upper support frame 1-3. The second support sleeve and the lower support frame 1-4 can further restrict the radial movement of the valve stem 7.

[0029] In this embodiment, a conical valve limiting block 5 is fixedly sleeved on the outer periphery of the valve stem 7. The conical valve limiting block 5 is located axially between the lower support frame 1-4 and the upper support frame 1-3. In this embodiment, a conical valve spring 6 is sleeved on the section of the valve stem 7 between the lower support frame 1-4 and the conical valve limiting block 5, so that the lower support frame 1-4 and the conical valve limiting block 5 form a spring limit to prevent the conical valve spring 6 from disengaging. The slurry enters the first flow channel a through the slurry hole 1-2 and reaches the conical valve core 4. During the compression of the conical valve core 4, the conical valve stem 7 moves downward as a whole under the suspension of the upper support frame 1-3 and the lower support frame 1-4. The conical valve spring 6 is compressed under the limiting of the lower support frame 1-4 and the conical valve limiting block 5, and the conical valve opens to allow the slurry to flow out.

[0030] In one or more embodiments, a limiting block 1-1 extending radially outward is provided at the top of the valve body 1. The limiting block 1-1 is located above the slurry passage, and the lower surface of the limiting block 1-1 can abut against the upper surface of the shut-off valve core 2 to restrict the shut-off valve core 2 from moving upward in the axial direction. Optionally, the limiting block 1-1 is connected to the valve body 1 by threads.

[0031] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto 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, provided there is no structural conflict. The present 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 float valve, characterized in that, include: The valve body comprises a shut-off valve and a conical valve connected to the valve body. The valve body has a slurry passage hole on its outer periphery and a first flow passage communicating with the slurry passage hole inside. The shut-off valve core is sleeved on the outer periphery of the valve body and can close the slurry passage hole. The shut-off valve core is slidably connected to the valve body. The conical valve core is disposed inside the bottom end of the first flow passage.

2. The float valve according to claim 1, characterized in that, The conical valve includes: a valve stem connected to the bottom end of the conical valve core and arranged axially, and a conical valve spring sleeved on the outer periphery of the valve stem.

3. The float valve according to claim 2, characterized in that, The valve stem is centrally located inside the valve body.

4. The float valve according to claim 3, characterized in that, The valve body includes: a first support sleeve fitted around the outer periphery of the valve stem, and an upper support frame integrally connected to the side of the first support sleeve away from the valve stem.

5. The float valve according to claim 4, characterized in that, The top end of the conical valve spring is connected to the lower surface of the conical valve core, and the bottom end is connected to the upper support frame.

6. The float valve according to claim 4, characterized in that, The valve body further includes: a second support sleeve fitted around the outer periphery of the valve stem, and a lower support frame integrally connected to the side of the second support sleeve away from the valve stem, wherein the lower support frame is disposed at the lower part of the upper support frame and is parallel to the upper support frame.

7. The float valve according to claim 6, characterized in that, A conical valve limiting block is fixedly sleeved on the outer periphery of the valve stem, and the conical valve limiting block is located axially between the lower support frame and the upper support frame.

8. The float valve according to claim 7, characterized in that, The valve stem is fitted with the conical valve spring on the rod segment between the lower support frame and the conical valve limiting block.

9. The float valve according to claim 1 or 2, characterized in that, The valve body is provided with a limiting block that extends radially outward at its top end.

10. The float valve according to claim 1 or 2, characterized in that, The bottom end of the first flow passage is configured as a conical surface that fits the upper surface of the conical valve core.

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