Repeated switching valve

Abstract

The invention belongs to the technical field of downhole tools, and particularly relates to a repeated switching valve. The repeated switching valve comprises a valve body, a valve rod and a valve rod, wherein an overflowing hole is formed in the end part of the valve body; the valve core is movably arranged in the valve body along the axial direction; the valve rod is movably arranged in the valve body along the axial direction; the elastic piece is used for providing pre-tightening force, and the two axial ends of the elastic piece abut against the valve rod and the valve body respectively; in the first state, the upper end of the valve rod can abut against the valve element, so that the pre-tightening force of the elastic piece is transmitted to the valve element, and the upper end of the valve element seals the overflowing hole in a one-way mode. And in the second state, the valve rod does not abut against the valve element any more, the pre-tightening force of the elastic piece cannot be transmitted to the valve element, and therefore the valve element does not seal the overflowing hole any more.

Description

Technical Field

[0001] The present invention belongs to the technical field of downhole tools, and in particular, relates to a repeated switching valve. Background Art

[0002] At present, in the floating collar and floating shoe products of petroleum engineering cementing tools, a one-way valve structure is used to achieve one-way passage of fluid to meet the working requirements of the floating collar and floating shoe products.

[0003] In order to facilitate entering the well, in the prior art, a floating collar / floating shoe with a self-grouting valve of a floating ball type, a sliding sleeve closing type, a limit ball type, etc. is often used, which is installed in the casing string and lowered together with the casing. By setting a self-grouting valve, the casing string can be automatically grouted during the well entry process, thereby reducing the resistance from the fluid in the well during the well entry process. After the casing string is in place in the well, the closing structure of the self-grouting valve is activated, and the self-grouting valve is transformed into a one-way valve, realizing one-way passage of the fluid, meeting the working requirements of the floating collar and floating shoe products.

[0004] However, after the closing structure of the self-grouting valve of the above structure is activated, the automatic grouting function fails and it is completely transformed into a one-way valve structure and cannot be transformed into a self-grouting valve again to realize the self-grouting function.

[0005] With the development of drilling and completion technology, there is an urgent need to develop a device that can repeatedly switch between a self-grouting valve and a one-way valve. Summary of the invention

[0006] In view of the technical problem mentioned above, the present invention aims to provide a repeated switching valve, which can repeatedly switch between a self-grouting valve and a one-way valve.

[0007] According to the present invention, there is provided a repeated switching valve, comprising:

[0008] A valve body, wherein a flow hole is provided at an end of the valve body;

[0009] A valve core movably arranged in the valve body along the axial direction;

[0010] A valve stem movably disposed in the valve body along the axial direction; and

[0011] An elastic member for providing a pre-tightening force, wherein two axial ends of the elastic member abut against the valve stem and the valve body respectively;

[0012] In the first state, the valve stem is constructed so that its upper end can abut against the valve core, thereby transmitting the preload force of the elastic member to the valve core, so that the upper end of the valve core can unidirectionally seal the flow hole;

[0013] In the second state, the valve stem no longer abuts against the valve core, and the preload force of the elastic member cannot be transmitted to the valve core, so that the valve core no longer seals the flow hole.

[0014] In a specific embodiment, the valve body includes a middle section, a first through hole is axially penetrated through the middle section, and the valve core and the valve stem are respectively located at the upper and lower sides of the middle section.

[0015] In the first state, the upper end of the valve stem axially abuts against the valve core through the first through hole.

[0016] In the second state, the upper end of the valve stem axially abuts against the middle section, thereby no longer abutting against the valve core.

[0017] In a specific embodiment, a guide block is provided in the first through hole.

[0018] A rotor sleeve is arranged at the upper end of the valve stem, a plurality of axial second slide grooves are arranged circumferentially on the side of the rotor sleeve, and abutment grooves are arranged between adjacent second slide grooves at the upper end of the rotor sleeve.

[0019] In the first state, the second slide groove of the valve stem is adapted to be connected with the guide block, so that the valve stem can axially abut against the valve core through the first through hole.

[0020] In the second state, the valve stem rotates under the action of external force until the abutment groove axially abuts against the guide block, so that the valve stem no longer abuts against the valve core.

[0021] In a specific embodiment, a stator sleeve is provided at the lower end of the valve core, and a first slide groove for adapting and connecting with the guide block is provided on the side of the stator sleeve. The stator sleeve is constructed to be able to pass downward through the first through hole and push the valve stem to rotate the valve stem by a certain angle, thereby switching the valve stem between the first state and the second state.

[0022] In a specific embodiment, a plurality of switching grooves are circumferentially arranged at the lower end of the stator sleeve, the switching groove includes a first guide bevel, and the abutment groove includes a second guide bevel. In the process of the stator sleeve pushing the valve stem downward, the lower end of the stator sleeve is adapted to the second guide bevel, or the upper end of the rotor sleeve is adapted to the first guide bevel, so that the rotor sleeve rotates relative to the stator sleeve, thereby rotating the valve stem.

[0023] In a specific embodiment, the valve stem is configured to switch between the first state and the second state in response to downhole fluid displacement.

[0024] In a specific embodiment, the valve body includes a first valve section located above the middle section, and the flow hole is coaxially arranged in the first valve section.

[0025] In a specific embodiment, the flow hole is constructed in a shape with a diameter gradually decreasing from bottom to top, and a plug for sealing the flow hole is provided at the upper end of the valve core.

[0026] In a specific embodiment, the valve body includes a second valve section located below the middle section, a second through hole is coaxially arranged in the second valve section, and the valve stem is axially movably arranged in the second through hole.

[0027] In a specific embodiment, two axial ends of the elastic member abut against the second valve section and the valve stem respectively.

[0028] Compared with the prior art, the advantages of the present application are as follows.

[0029] The present invention can be repeatedly switched between the first state and the second state. When switched to the first state, the valve stem axially abuts against the valve core, and the preload force of the elastic member is transmitted to the valve core through the valve stem, so that the valve core seals against the flow hole, and acts as a one-way valve. When switched to the second state, the valve stem no longer abuts against the valve core, and the preload force of the elastic member no longer affects the valve core. At the same time, the valve core is separated from the flow hole under the action of gravity, so that the present invention acts as a self-grouting valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be described below with reference to the accompanying drawings.

[0031] Figure 1 A schematic diagram showing the internal structure of an embodiment of a repeated switching valve according to the present invention is shown;

[0032] Figure 2 A schematic diagram of a three-dimensional structure of an embodiment of a valve core according to the present invention is shown;

[0033] Figure 3 A schematic diagram of a three-dimensional structure of an embodiment of a valve core according to the present invention is shown;

[0034] Figure 4 A schematic diagram of a three-dimensional structure of an embodiment of a valve stem according to the present invention is shown;

[0035] Figure 5 A schematic diagram of the three-dimensional structure of an embodiment of a valve body according to the present invention is shown;

[0036] Figure 6 A schematic diagram showing the internal structure of a valve core according to an embodiment of the present invention is shown;

[0037] Figure 7 A schematic diagram of a three-dimensional structure of an embodiment of an elastic member according to the present invention is shown;

[0038] Figure 8 A schematic diagram of a three-dimensional structure of an embodiment of a repeated switching valve according to the present invention is shown;

[0039] Fig. 9 A schematic diagram showing the switching of the repeated switching valve according to the present invention from the first state to the second state is shown, and the developed surface structure of the first through hole, the stator sleeve and the rotor sleeve is schematically shown in the figure;

[0040] Fig.10 A schematic diagram of the repeated switching valve according to the present invention switching from the second state to the first state is shown, and the developed surface structures of the first through hole, the stator sleeve and the rotor sleeve are schematically shown in the figure.

[0041] The reference numerals in the figures are as follows:

[0042] 1. valve body; 11. flow hole; 12. middle section; 121. first through hole; 122. guide block; 13. first valve section; 14. second valve section; 141. second through hole;

[0043] 2. valve core; 21. stator sleeve; 211. first slide groove; 212. switching groove; 213. first guide inclined surface; 22. plug;

[0044] 3. Valve stem; 31. Rotor sleeve; 311. Second slide groove; 312. Abutment groove; 313. Second guide slope; 314. Third guide slope;

[0045] 4. Elastic parts;

[0046] 100. Repeat the valve switching.

[0047] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0048] The present invention will be described below with reference to the accompanying drawings.

[0049] It should be noted that the directional terms or qualifiers "upper" and "lower" used in this application are all directed to the referenced Figure 1 They are not intended to define the absolute positions of the components involved, but may vary depending on the specific circumstances.

[0050] Figure 1 The structure of the repeated switching valve 100 according to the present invention is shown. Figure 1 As shown, the repeated switching valve 100 mainly includes a valve body 1 , a valve core 2 , a valve stem 3 and an elastic member 4 .

[0051] A flow hole 11 is provided at the upper end of the valve body 1. The valve core 2 is axially movably arranged in the valve body 1 and is located below the flow hole 11, and is used to seal the flow hole 11. The valve stem 3 is axially movably arranged in the valve body 1 and is located below the valve core 2. The axial ends of the elastic member 4 abut against the valve stem 3 and the valve body 1 respectively, and the elastic member 4 can provide an upward preload force to the valve stem 3.

[0052] In the first state, the upper end of the valve stem 3 can abut against the valve core 2, thereby transmitting the preload force of the elastic member 4 to the valve core 2, so that the upper end of the valve core 2 can one-way seal the flow hole 11. At this time, the repeated switching valve 100 acts as a one-way valve. In other words, when the fluid flows from top to bottom, the fluid can push the valve core 2 and the valve stem 3 downward, thereby opening the flow hole 11. When the fluid flows from bottom to top, the valve core 2 seals the flow hole 11 under the preload force of the elastic member 4, so that the fluid cannot pass through the flow hole 11.

[0053] In the second state, the valve stem 3 no longer abuts the valve core 2, and the preload force of the elastic member 4 cannot be transmitted to the valve core 2, so that the valve core 2 no longer seals the flow hole 11. At this time, the flow hole 11 of the repeated switching valve 100 is in a normally open state, and the fluid can flow freely from top to bottom or from bottom to top.

[0054] The following is a description of a specific embodiment of the repeated switching valve 100 provided according to the present invention. Figures 1 to 8 shown.

[0055] like Figure 1 , Figure 5 and Figure 6 As shown, in a specific embodiment, the valve body 1 includes a first valve section 13, a middle section 12 and a second valve section 14 which are arranged in sequence from top to bottom.

[0056] The valve core 2 and the valve stem 3 are respectively located at the upper and lower sides of the middle section 12. That is, the valve core 2 is located between the middle section 12 and the first valve section 13, and the valve stem 3 is located between the middle section 12 and the second valve section 14.

[0057] According to the present invention, the flow hole 11 is coaxially arranged to penetrate the first valve section 13. A plug 22 for sealing the flow hole 11 is arranged at the upper end of the valve core 2.

[0058] A first through hole 121 is axially penetrated in the middle section 12 , and the valve core 2 is axially movably disposed in the first through hole 121 of the middle section 12 .

[0059] A second through hole 141 is axially provided on the second valve section 14. The valve stem 3 is axially movably provided in the second through hole 141 of the second valve section 14.

[0060] like Figure 4 As shown, a rotor sleeve 31 is provided at the upper end of the valve stem 3. The elastic member 4 is sleeved on the outer side of the valve stem 3, and the lower end of the elastic member 4 abuts against the second valve section 14, and the upper end of the elastic member 4 abuts against the rotor sleeve 31 of the valve stem 3. Through this arrangement, the elastic member 4 can provide the valve stem 3 with an upward preload relative to the second valve section 14.

[0061] Furthermore, an axially extending guide block 122 is provided in the first through hole 121. A plurality of axial second slide grooves 311 are evenly and spacedly provided on the side of the rotor sleeve 31 along the circumferential direction, and an abutment groove 312 is provided between adjacent second slide grooves 311 at the upper end of the rotor sleeve 31.

[0062] In the first state, the second slide groove 311 of the valve stem 3 is adaptively slidably connected with the guide block 122 to form a sliding pair, so that the valve stem 3 can axially abut the valve core 2 through the first through hole 121. At this time, the preload force of the elastic member 4 can be transmitted to the valve core 2 through the valve stem 3, so that the plug 22 of the valve core 2 can unidirectionally seal the flow hole 11, playing the role of a one-way valve.

[0063] In the second state, the rotor sleeve 31 of the valve stem 3 rotates a certain angle under the action of external force, so that the abutment groove 312 axially abuts the guide block 122, so that the valve stem 3 no longer abuts the valve core 2. At this time, the axial distance between the upper end of the valve stem 3 and the flow hole 11 is greater than the axial length of the valve core 2. Therefore, the valve core 2 can move downward under the action of gravity to separate from the flow hole 11, so that the flow hole 11 is in a normally open state, and the fluid can flow freely from top to bottom or from bottom to top through the flow hole 11, playing the role of a self-grouting valve.

[0064] According to the present invention, in a specific embodiment, the valve core 2 can rotate the valve stem 3 by a certain angle under the action of fluid displacement, so as to switch the valve stem 3 between the first state and the second state.

[0065] like Figure 2 and Figure 3 As shown, a stator sleeve 21 is provided at the lower end of the valve core 2, and a first slide groove 211 extending in the axial direction is provided on the side of the stator sleeve 21. The stator sleeve 21 is coaxially sleeved in the first through hole 121, and the first slide groove 211 is slidably matched with the guide block 122. Under this arrangement, the valve core 2 is movably arranged in the first through hole 121 of the middle section 12 in the axial direction, and the valve core 2 cannot rotate relative to the middle section 12.

[0066] A plurality of switching grooves 212 are axially arranged on the lower end surface of the stator sleeve 21, and the switching grooves 212 are configured to enable the valve stem 3 to rotate. Specifically, when the displacement of the fluid flowing from top to bottom reaches a certain level, the fluid pushes the valve core 2 to move downward through the first through hole 121, and pushes the rotor sleeve 31 of the valve stem 3 to move downward through the stator sleeve 21. Under the action of the guide inclined surface of the switching groove 212 of the stator sleeve 21 or the guide inclined surface of the rotor sleeve 31, the rotor sleeve 31 rotates a certain angle relative to the stator sleeve 21, so that the repeated switching valve 100 switches between the first state and the second state.

[0067] Specifically, a plurality of switching grooves 212 are circumferentially arranged at the lower end of the stator sleeve 21, the switching groove 212 includes a first guide bevel 213, and the abutment groove 312 includes a second guide bevel 313. In the process of the stator sleeve 21 pushing the valve stem 3 downward, the lower end of the stator sleeve 21 is adapted to the second guide bevel 313, or the upper end of the rotor sleeve 31 is adapted to the first guide bevel 213, so that the rotor sleeve 31 rotates relative to the stator sleeve 21, thereby rotating the valve stem 3.

[0068] For ease of explanation, Fig. 9 A schematic diagram showing a repeated switching valve 100 according to the present invention switching from a first state to a second state, Fig.10 A schematic diagram of the repeated switching valve 100 according to the present invention switching from the second state to the first state is shown, and the figure schematically shows the unfolded surface structure of the first through hole 121, the stator sleeve 21 and the rotor sleeve 31. The number of the guide block 122, the first slide groove 211, the second slide groove 311, etc. in the figure is not used to limit the protection scope of the present invention, but is only used to illustrate the working principle of the present invention. Those skilled in the art can set the specific number according to the present invention.

[0069] Fig. 9 The first figure in the figure schematically shows the first state of the repeated switching valve 100. At this time, the upper end face of the rotor sleeve 31 is axially abutted against the lower end face of the stator sleeve 21, and the preload force of the elastic member 4 can be transmitted to the valve core 2 through the valve stem 3, the rotor sleeve 31, and the stator sleeve 21, so that the plug 22 at the upper end of the valve core 2 can one-way seal the flow hole 11 and play the role of a one-way valve. It should be noted that the repeated switching valve 100 that plays the role of a one-way valve in the first state can only be used under a preset fluid displacement to prevent the upper end face of the rotor sleeve 31 from being lower than the lower end face of the guide block 122 of the middle section 12. If the fluid displacement exceeds the preset value, the repeated switching valve 100 will switch to the second state, as described below.

[0070] When the repetitive switching valve 100 needs to be switched from the first state to the second state, the displacement of the fluid flowing from top to bottom is increased to reach the switching displacement, and the valve core 2 drives the stator sleeve 21 to move downward relative to the middle section 12 under the pressure of the fluid, and pushes the rotor sleeve 31 of the valve stem 3 to move downward until the upper end of the rotor sleeve 31 is lower than the lower end surface of the guide block 122 of the middle section 12. Fig. 9 As shown in the second figure in FIG. 1 , the second guide bevel 313 of the rotor sleeve 31 axially abuts against the lower end of the stator sleeve 21. Under the action of the second guide bevel 313, the rotor sleeve 31 rotates a certain angle relative to the stator sleeve 21 until the second guide bevel 313 of the rotor sleeve 31 axially corresponds to the guide block 122. At this time, the displacement of the fluid is reduced, and the valve stem 3 moves upward under the action of the elastic member 4. Finally, as shown in FIG. Fig. 9 As shown in the third figure, the abutment groove 312 of the rotor sleeve 31 of the valve stem 3 axially abuts against the lower end surface of the guide block 122. The valve core 2 is no longer subjected to the pre-tightening force of the elastic member 4 transmitted from the valve stem 3, so the valve core 2 can be separated from the flow hole 11 downward under the action of gravity, and the flow hole 11 is in a normally open state, and the repeated switching valve 100 acts as a self-grouting valve.

[0071] When it is necessary to switch the repetitive switching valve 100 from the second state to the first state, the displacement of the fluid flowing from top to bottom is increased again to reach the switching displacement, and the valve core 2 drives the stator sleeve 21 to move downward relative to the middle section 12 under the pressure of the fluid, and pushes the rotor sleeve 31 of the valve stem 3 to move downward until the upper end of the rotor sleeve 31 is lower than the lower end surface of the guide block 122 of the middle section 12, as shown in FIG. Fig.10 As shown in the first figure of FIG. The first guide bevel 213 of the stator sleeve 21 axially abuts against the upper end of the rotor sleeve 31. Under the action of the first guide bevel 213, the rotor sleeve 31 rotates a certain angle relative to the stator sleeve 21 until the third guide bevel 314 of the rotor sleeve 31 corresponds to the guide block 122 in the axial direction. Fig.10 As shown in the second figure. At this time, the displacement of the fluid is reduced, and the valve stem 3 moves upward under the action of the elastic member 4. Fig.10 As shown in the third figure, the third guide slope 314 of the rotor sleeve 31 of the valve stem 3 abuts against the lower end surface of the guide block 122, and the rotor sleeve 31 rotates a certain angle relative to the guide block 122. Finally, as Fig. 9 As shown in the first figure, the repeated switching valve 100 is switched to the first state and acts as a one-way valve.

[0072] According to the present invention, the flow hole 11 is configured to have a diameter that gradually decreases from bottom to top, and a plug 22 for sealing the flow hole 11 is disposed at the upper end of the valve core 2 .

[0073] In this embodiment, the flow hole 11 is configured as a concave spherical surface, the upper end surface of the plug 22 is configured as a convex spherical surface, the lower end surface of the plug 22 is configured as a plane, and the radial dimension of the lower end surface of the plug 22 is greater than the outer diameter dimension of the valve core 2. It is easy to understand that by adjusting the outer diameter dimension of the plug 22 and the inner diameter dimension of the valve body 1, the size of the switching displacement can be designed.

[0074] According to the present invention, a method for using a floating collar and a floating shoe is also provided, which is specifically as follows.

[0075] The repetitive switching valve 100 provided by the present invention is installed on the floating collar and floating shoe, and connected to the casing string. At this time, the repetitive switching valve 100 is in the second state. The floating collar and floating shoe with the repetitive switching valve 100 installed are put into the well. At this time, the repetitive switching valve 100 is in the second state, and the downhole fluid can automatically flow into the casing string, reducing the resistance of the downhole fluid to the casing string.

[0076] After the casing string is in place in the well, fluid exceeding the switching displacement is pumped into the casing string from the wellhead to switch the repeated switching valve 100 to the first state. At this time, the repeated switching valve 100 acts as a one-way valve, which facilitates the implementation of subsequent cementing technology.

[0077] As required, fluid exceeding the switching displacement may be pumped from the wellhead into the casing string again to switch the repeated switching valve 100 between the first state and the second state.

[0078] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0081] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A repeated switching valve, characterized in that: include: A valve body (1), wherein a flow hole (11) is provided at an end of the valve body (1); A valve core (2) movably arranged in the valve body (1) along the axial direction; a valve stem (3) movably arranged in the valve body (1) along the axial direction; and An elastic member (4) for providing a pre-tightening force, wherein two axial ends of the elastic member (4) respectively abut against the valve stem (3) and the valve body (1); In a first state, the valve stem (3) is constructed so that its upper end can abut against the valve core (2), thereby transmitting the preload force of the elastic member (4) to the valve core (2), so that the upper end of the valve core (2) can unidirectionally seal the flow hole (11); In the second state, the valve stem (3) no longer abuts against the valve core (2), and the preload force of the elastic member (4) cannot be transmitted to the valve core (2), so that the valve core (2) no longer seals the flow hole (11).

2. The repetitive switching valve according to claim 1, characterized in that: The valve body (1) comprises a middle section (12), a first through hole (121) is axially penetrated through the middle section (12), the valve core (2) and the valve stem (3) are respectively located at the upper and lower sides of the middle section (12). In the first state, the upper end of the valve stem (3) axially abuts against the valve core (2) through the first through hole (121). In the second state, the upper end of the valve stem (3) axially abuts against the middle section (12), thereby no longer abutting against the valve core (2).

3. The repetitive switching valve according to claim 2, characterized in that: A guide block (122) is arranged in the first through hole (121). A rotor sleeve (31) is provided at the upper end of the valve stem (3), a plurality of axial second slide grooves (311) are provided along the circumferential direction on the side surface of the rotor sleeve (31), and an abutment groove (312) is provided between adjacent second slide grooves (311) at the upper end of the rotor sleeve (31). In the first state, the second slide groove (311) of the valve stem (3) is adaptively connected to the guide block (122), so that the valve stem (3) can axially abut against the valve core (2) through the first through hole (121). In the second state, the valve stem (3) rotates under the action of an external force until the abutment groove (312) axially abuts against the guide block (122), so that the valve stem (3) no longer abuts against the valve core (2).

4. The repetitive switching valve according to claim 3, characterized in that: A stator sleeve (21) is arranged at the lower end of the valve core (2), and a first slide groove (211) for adapting and connecting with the guide block (122) is arranged on the side of the stator sleeve (21). The stator sleeve (21) is constructed to be able to pass through the first through hole (121) downward and push the valve stem (3), so that the valve stem (3) rotates a certain angle, thereby switching the valve stem (3) between the first state and the second state.

5. The repetitive switching valve according to claim 4, characterized in that: A plurality of switching grooves (212) are circumferentially arranged at the lower end of the stator sleeve (21), the switching groove (212) including a first guide bevel (213), and the abutment groove (312) including a second guide bevel (313). When the stator sleeve (21) pushes the valve stem (3) downward to move, the lower end of the stator sleeve (21) is matched with the second guide bevel (313), or the upper end of the rotor sleeve (31) is matched with the first guide bevel (213), so that the rotor sleeve (31) rotates relative to the stator sleeve (21), thereby rotating the valve stem (3).

6. The repeated switching valve according to any one of claims 1 to 5, characterized in that: The valve stem (3) is configured to switch between the first state and the second state in response to downhole fluid displacement.

7. The repeated switching valve according to any one of claims 2 to 5, characterized in that: The valve body (1) comprises a first valve section (13) located above the middle section (12), and the flow hole (11) is coaxially arranged in the first valve section (13).

8. The repetitive switching valve according to claim 7, characterized in that: The flow hole (11) is constructed in a shape with a diameter gradually decreasing from bottom to top, and the upper end of the valve core (2) is provided with a plug (22) for sealing the flow hole (11).

9. The repeated switching valve according to any one of claims 2 to 5, characterized in that: The valve body (1) comprises a second valve section (14) located below the middle section (12), a second through hole (141) being coaxially arranged in the second valve section (14), and the valve stem (3) being axially movably arranged in the second through hole (141).

10. The repetitive switching valve according to claim 9, characterized in that: The two axial ends of the elastic member (4) respectively abut against the second valve section (14) and the valve stem (3).

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