CN119102553A - A repetitive switching valve - Google Patents

Abstract

The present invention belongs to the technical field of downhole tools, and specifically, relates to a repeated switching valve. The repeated switching valve comprises: a valve body, at the end of which a flow hole is provided; a valve core movably arranged in the valve body along the axial direction; a valve stem movably arranged in the valve body along the axial direction; and an elastic member for providing a preload force, wherein the axial ends of the elastic member abut against the valve stem and the valve body respectively; in a 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 unidirectionally seals the flow hole; in a 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.

Description

Repeated switching valve

Technical Field

The invention belongs to the technical field of downhole tools, and particularly relates to a repeated switching valve.

Background

At present, in the floating collar floating shoe product of the petroleum engineering cementing tool, a one-way valve structure is adopted to realize one-way passage of fluid, so that the working requirement of the floating collar floating shoe product is met.

In order to facilitate well entry, in the prior art, float hoops/shoes provided with self-grouting valves of floating ball type, sliding sleeve closing type, limiting ball type and other structures are mostly adopted, and are installed in a casing string to be put into the casing string together with a casing. By arranging the self-grouting valve, the casing string can realize automatic grouting in the well entering process, thereby reducing the resistance from the fluid in the well during the well entering process. After the sleeve string enters the well in place, the closing structure of the self-grouting valve is excited again, so that the self-grouting valve is converted into a one-way valve, the fluid is enabled to pass through in one direction, and the working requirement of the floating collar floating shoe product is met.

However, after the closing structure of the self-grouting valve with the structure is excited, the automatic grouting function is invalid, the self-grouting valve is thoroughly converted into a one-way valve structure, and the self-grouting valve cannot be converted into the self-grouting valve again, so that the self-grouting function is realized.

With the development of the well completion process, there is a need to develop a device that can repeatedly switch between a self-grouting valve and a one-way valve.

Disclosure of Invention

In view of the above technical problems, the present invention aims to propose a repetitive switching valve capable of switching repeatedly between a self-grouting valve and a one-way valve.

According to the present invention, there is provided a repetitive switching valve comprising:

a valve body, wherein an overflow hole is arranged at the end part of the valve body;

A valve core arranged in the valve body in an axially movable manner;

A valve rod axially movably disposed within the valve body, and

The elastic piece is used for providing pretightening force, and two axial end parts of the elastic piece are respectively abutted against the valve rod and the valve body;

In a first state, the upper end part of the valve rod can be abutted against the valve core, so that the pretightening force of the elastic piece is transmitted to the valve core, and the upper end part of the valve core is in one-way sealing with the overflow hole;

in the second state, the valve rod is not abutted against the valve core any more, and the pretightening force of the elastic piece cannot be transmitted to the valve core, so that the valve core is not sealed in the overflow hole any more.

In a specific embodiment, the valve body comprises a middle section, a first through hole is axially arranged on the middle section in a penetrating way, the valve core and the valve rod are respectively positioned on the upper side and the lower side of the middle section,

In the first state, the upper end part of the valve rod is axially abutted against the valve core through the first through hole,

In the second state, the upper end of the valve rod axially abuts the intermediate section, so that the valve core is no longer in abutment.

In a specific embodiment, a guide block is disposed within the first through hole,

A rotor sliding sleeve is arranged at the upper end part of the valve rod, a plurality of axial second sliding grooves are arranged on the side surface of the rotor sliding sleeve along the circumferential direction, an abutting groove is arranged between the adjacent second sliding grooves at the upper end part of the rotor sliding sleeve,

In the first state, the second sliding groove of the valve rod is connected with the guide block in an adapting way, so that the valve rod can axially abut against the valve core through the first through hole,

In the second state, the valve rod rotates under the action of external force until the abutting groove axially abuts against the guide block, so that the valve rod is not abutted against the valve core any more.

In a specific embodiment, a stator sliding sleeve is arranged at the lower end part of the valve core, a first sliding groove used for being connected with the guide block in an adapting mode is arranged on the side face of the stator sliding sleeve, and the stator sliding sleeve is configured to penetrate through the first through hole downwards and push the valve rod to enable the valve rod to rotate a certain angle, so that the valve rod is switched between a first state and a second state.

In a specific embodiment, a plurality of switching grooves are formed in the lower end portion of the stator sliding sleeve along the circumferential direction, the switching grooves comprise first guide inclined surfaces, the abutting grooves comprise second guide inclined surfaces, and in the process that the stator sliding sleeve pushes the valve rod to move downwards, the lower end portion of the stator sliding sleeve is matched with the second guide inclined surfaces, or the upper end portion of the rotor sliding sleeve is matched with the first guide inclined surfaces, so that the rotor sliding sleeve rotates relative to the stator sliding sleeve, and the valve rod rotates.

In a specific embodiment, the valve stem is configured to be switchable between the first state and the second state in response to a displacement of downhole fluid.

In a specific embodiment, the valve body includes a first valve section above the intermediate section, and the flow-through aperture is coaxially disposed within the first valve section.

In a specific embodiment, the overflow hole is configured into a shape with a caliber gradually decreasing from bottom to top, and a plug for plugging the overflow hole is arranged at the upper end part of the valve core.

In a specific embodiment, the valve body comprises a second valve section below the middle section, a second through hole is coaxially arranged in the second valve section, and the valve rod is axially movably arranged in the second through hole.

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

Compared with the prior art, the application has the following advantages.

The present invention can repeatedly switch between the first state and the second state. When the valve is switched to the first state, the valve rod axially abuts against the valve core, the pretightening force of the elastic piece is transmitted to the valve core through the valve rod, the valve core is enabled to abut against the overflow hole in a sealing mode, and the one-way valve is achieved. When the valve is switched to the second state, the valve rod is not abutted against the valve core any more, the pretightening force of the elastic piece does not influence the valve core any more, and meanwhile, the valve core is separated from the overflow hole under the action of gravity, so that the self-grouting valve plays a role in self-grouting.

Drawings

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

FIG. 1 shows a schematic internal structure of an embodiment of a repetitive switching valve according to the present invention;

FIG. 2 shows a schematic perspective view of one embodiment of a valve cartridge according to the present disclosure;

FIG. 3 shows a schematic perspective view of one embodiment of a valve cartridge according to the present disclosure;

FIG. 4 shows a schematic perspective view of an embodiment of a valve stem according to the present invention;

FIG. 5 shows a schematic perspective view of an embodiment of a valve body according to the present invention;

FIG. 6 shows a schematic internal structure of an embodiment of a valve cartridge according to the present invention;

FIG. 7 shows a schematic perspective view of an embodiment of an elastic member according to the present invention;

FIG. 8 shows a schematic perspective view of one embodiment of a repetitive switching valve according to the present invention;

FIG. 9 is a schematic view of a repetitive switching valve according to the present invention switching from a first state to a second state, schematically showing the configuration of the deployment surfaces of a first through-hole, a stator sliding sleeve and a rotor sliding sleeve;

Fig. 10 is a schematic view showing the switching of the repetitive switching valve according to the present invention from the second state to the first state, schematically showing the deployment surface structure of the first through hole, the stator sliding sleeve and the rotor sliding sleeve.

Reference numerals in the drawings are as follows:

1. valve body, 11, overflow hole, 12, middle section, 121, first through hole, 122, guide block, 13, first valve section, 14, second valve section, 141, second through hole;

2. the valve comprises a valve core, a stator sliding sleeve, 211, a first sliding groove, 212, a switching groove, 213, a first guide inclined plane, 22 and a plug;

3. The valve rod, 31, the rotor sliding sleeve, 311, a second sliding chute, 312, an abutting groove, 313, a second guide inclined plane, 314 and a third guide inclined plane;

4. An elastic member;

100. The switching valve is repeated.

In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.

Detailed Description

The invention is described below with reference to the accompanying drawings.

The directional terms or qualifiers "upper" and "lower" used in the present application are used with respect to fig. 1 to which reference is made. They are not intended to limit the absolute position of the parts involved, but may vary according to the specific circumstances.

Fig. 1 shows the structure of a repetitive switching valve 100 according to the present invention. As shown in fig. 1, the repetitive switching valve 100 mainly includes a valve body 1, a valve spool 2, a valve stem 3, and an elastic member 4.

An overflow hole 11 is provided at the upper end of the valve body 1. The valve core 2 is arranged in the valve body 1 in an axially movable manner and is positioned below the overflow hole 11, and is used for sealing the overflow hole 11. The valve rod 3 is arranged in the valve body 1 in an axially movable manner and is positioned below the valve core 2. The two axial end parts of the elastic piece 4 are respectively abutted against the valve rod 3 and the valve body 1, and the elastic piece 4 can provide upward pretightening force for the valve rod 3.

In the first state, the upper end portion of the valve rod 3 can abut against the valve core 2, so that the pretightening force of the elastic member 4 is transmitted to the valve core 2, the upper end portion of the valve core 2 is sealed in a one-way manner to the through hole 11, and the repeated switching valve 100 acts as a one-way valve. That is, when the fluid flows from the top down, the fluid can push the valve body 2 and the valve stem 3 downward, thereby opening the flow-through hole 11. When fluid flows from bottom to top, the valve core 2 seals the flow-through hole 11 under the pretightening force of the elastic piece 4, so that the fluid cannot pass through the flow-through hole 11.

In the second state, the valve rod 3 is not abutted against the valve core 2 any more, the pretightening force of the elastic piece 4 cannot be transmitted to the valve core 2, so that the valve core 2 is not sealed with the overflow hole 11 any more, at the moment, the overflow hole 11 of the repeated switching valve 100 is in a normally open state, and fluid can flow freely from top to bottom or from bottom to top.

The following describes an embodiment of the repetitive switching valve 100 according to the present invention, as shown in fig. 1 to 8.

As shown in fig. 1, 5 and 6, in a specific embodiment, the valve body 1 comprises a first valve section 13, an intermediate section 12 and a second valve section 14 arranged in sequence from top to bottom.

The valve core 2 and the valve rod 3 are respectively positioned on the upper side and the lower side of the middle section 12. That is, the valve spool 2 is located between the intermediate section 12 and the first valve section 13, and the valve stem 3 is located between the intermediate section 12 and the second valve section 14.

According to the invention, the flow opening 11 is arranged coaxially through the first valve section 13. A plug 22 for sealing the flow-through hole 11 is provided at the upper end of the valve body 2.

The intermediate section 12 is provided with a first through hole 121 penetrating in the axial direction, and the valve element 2 is provided in the first through hole 121 of the intermediate section 12 in an axially movable manner.

A second through hole 141 is provided in the second valve segment 14 so as to extend in the axial direction. The valve rod 3 is arranged in the second through hole 141 of the second valve section 14 in an axially movable manner.

As shown in fig. 4, a rotor sliding sleeve 31 is provided at the upper end portion of the valve stem 3. The elastic member 4 is sleeved outside the valve rod 3, and the lower end of the elastic member 4 is abutted against the second valve section 14, and the upper end of the elastic member 4 is abutted against the rotor sliding sleeve 31 of the valve rod 3. By this arrangement, the elastic element 4 can provide an upward pretension of the valve stem 3 relative to the second valve section 14.

Further, an axially extending guide block 122 is provided in the first through hole 121. A plurality of axial second sliding grooves 311 are uniformly provided on the side surface of the rotor sliding sleeve 31 at intervals in the circumferential direction, and an abutment groove 312 is provided between adjacent second sliding grooves 311 on the upper end portion of the rotor sliding sleeve 31.

In the first state, the second sliding groove 311 of the valve rod 3 is in adaptive sliding connection with the guide block 122 to form a sliding pair, so that the valve rod 3 can axially abut against the valve core 2 through the first through hole 121. At this time, the pretightening force of the elastic member 4 can be transmitted to the valve core 2 through the valve rod 3, so that the plug 22 of the valve core 2 is in one-way sealing with the overflow hole 11 to play a role of a one-way valve.

In the second state, the rotor sliding sleeve 31 of the valve rod 3 rotates by a certain angle under the action of external force, so that the abutting groove 312 axially abuts against the guide block 122, and the valve rod 3 is no longer abutted against the valve core 2. At this time, the axial distance between the upper end of the valve rod 3 and the overflow hole 11 is greater than the axial length of the valve core 2, so that the valve core 2 can move downwards to be separated from the overflow hole 11 under the action of gravity, the overflow hole 11 is in a normally open state, and fluid can flow freely from top to bottom or from bottom to top through the overflow hole 11, so that the self-grouting valve is realized.

According to the invention, in a particular embodiment, the valve element 2 is capable of rotating the valve stem 3 by a certain angle under the influence of the displacement of fluid, so that it is switched between a first state and a second state.

As shown in fig. 2 and 3, a stator sliding sleeve 21 is provided at the lower end portion of the valve body 2, and a first slide groove 211 extending in the axial direction is provided on the side surface of the stator sliding sleeve 21. The stator sliding sleeve 21 is coaxially sleeved in the first through hole 121, and the first sliding groove 211 is in sliding fit with the guide block 122. With this arrangement, the spool 2 is disposed in the first through hole 121 of the intermediate section 12 so as to be movable in the axial direction, and the spool 2 cannot rotate relative to the intermediate section 12.

A plurality of switching grooves 212 are provided in the axial direction on the lower end surface of the stator sliding sleeve 21, and the switching grooves 212 are configured to be capable of rotating the valve rod 3. Specifically, when the fluid displacement flowing from top to bottom reaches a certain degree, the fluid pushes the valve core 2 to move downward through the first through hole 121, and pushes the rotor sliding sleeve 31 of the valve rod 3 to move downward through the stator sliding sleeve 21, and the rotor sliding sleeve 31 rotates by a certain angle relative to the stator sliding sleeve 21 under the action of the guide slope of the switching groove 212 of the stator sliding sleeve 21 or the guide slope of the rotor sliding sleeve 31, so that the repetitive switching valve 100 is switched between the first state and the second state.

Specifically, a plurality of switching grooves 212 are provided at the lower end portion of the stator sliding sleeve 21 along the circumferential direction, the switching grooves 212 include a first guiding inclined surface 213, the abutting grooves 312 include a second guiding inclined surface 313, and in the process that the stator sliding sleeve 21 pushes the valve rod 3 to move downwards, the lower end portion of the stator sliding sleeve 21 is matched with the second guiding inclined surface 313, or the upper end portion of the rotor sliding sleeve 31 is matched with the first guiding inclined surface 213, so that the rotor sliding sleeve 31 rotates relative to the stator sliding sleeve 21, and the valve rod 3 rotates.

For convenience of description, fig. 9 shows a schematic diagram of switching the repetitive switching valve 100 according to the present invention from the first state to the second state, fig. 10 shows a schematic diagram of switching the repetitive switching valve 100 according to the present invention from the second state to the first state, the structures of the first through hole 121, the stator sliding sleeve 21 and the unfolding surface of the rotor sliding sleeve 31 are schematically shown, and the numbers of the guide blocks 122, the first sliding grooves 211, the second sliding grooves 311, etc. in the drawings are not used for limiting the protection scope of the present invention, but are only used for illustrating the working principle of the present invention, and a person skilled in the art can set specific numbers by himself according to the present invention.

The first diagram in fig. 9 schematically shows a first state of the repetitive switching valve 100. At this time, the upper end surface of the rotor sliding sleeve 31 axially abuts against the lower end surface of the stator sliding sleeve 21, the pretightening force of the elastic member 4 can be transmitted to the valve core 2 through the valve rod 3, the rotor sliding sleeve 31 and the stator sliding sleeve 21, so that the plug 22 at the upper end part of the valve core 2 unidirectionally seals the overflow hole 11, and the unidirectional valve is realized. It should be noted that, the repeated switching valve 100 functioning as a check valve in the first state can only be used at a predetermined fluid displacement, and prevents the upper end surface of the rotor sliding sleeve 31 from being lower than the lower end surface of the guide block 122 of the intermediate section 12. If the displacement of fluid exceeds the preset value, the repetitive switching valve 100 is switched to the second state, as described in detail below.

When the repetitive switching valve 100 is required to be switched from the first state to the second state, the displacement of fluid flowing from top to bottom is increased to reach the switching displacement, and the valve core 2 drives the stator sliding sleeve 21 to move downwards relative to the middle section 12 under the pressure of the fluid and pushes the rotor sliding sleeve 31 of the valve rod 3 to move downwards until the upper end part of the rotor sliding sleeve 31 is lower than the lower end surface of the guide block 122 of the middle section 12. As shown in the second drawing in fig. 9, the second guide inclined surface 313 of the rotor sliding sleeve 31 axially abuts against the lower end portion of the stator sliding sleeve 21, and the rotor sliding sleeve 31 rotates by a certain angle relative to the stator sliding sleeve 21 under the action of the second guide inclined surface 313 until the second guide inclined surface 313 of the rotor sliding 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 by the elastic member 4. Finally, as shown in the third drawing of fig. 9, the abutment groove 312 of the rotor slide 31 of the valve stem 3 axially abuts the lower end surface of the guide block 122. The valve core 2 is not preloaded by the elastic piece 4 transmitted by the valve rod 3, so that the valve core 2 can be separated from the overflow hole 11 downwards under the action of gravity, the overflow hole 11 is in a normally open state, and the repeated switching valve 100 plays a role of a self-grouting valve.

When the repetitive switching valve 100 is required to switch 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 sliding sleeve 21 to move downwards relative to the middle section 12 under the pressure of the fluid and pushes the rotor sliding sleeve 31 of the valve rod 3 to move downwards until the upper end part of the rotor sliding sleeve 31 is lower than the lower end surface of the guide block 122 of the middle section 12, as shown in the first diagram of fig. 10. The first guiding inclined plane 213 of the stator sliding sleeve 21 axially abuts against the upper end portion of the rotor sliding sleeve 31, and the rotor sliding sleeve 31 rotates a certain angle relative to the stator sliding sleeve 21 under the action of the first guiding inclined plane 213 until the third guiding inclined plane 314 of the rotor sliding sleeve 31 axially corresponds to the guiding block 122, as shown in the second diagram of fig. 10. At this time, the displacement of the fluid is reduced, and the valve stem 3 moves upward by the elastic member 4. As shown in the third drawing of fig. 10, the third guide slope 314 of the rotor sliding sleeve 31 of the valve stem 3 abuts against the lower end surface of the guide block 122, and the rotor sliding sleeve 31 rotates by a certain angle with respect to the guide block 122. Finally, as shown in the first drawing of fig. 9, the repetitive switching valve 100 is switched to the first state and functions as a check valve.

According to the present invention, the overflow hole 11 is configured in a shape of gradually decreasing caliber from bottom to top, and the upper end portion of the valve core 2 is provided with a plug 22 for blocking the overflow hole 11.

In the present embodiment, the overflow 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 larger than the outer diameter dimension of the valve element 2. It is easy to understand that the size of the switching displacement can be designed by adjusting the outer diameter size of the plug 22 and the inner diameter size of the valve body 1.

The invention also provides a use method of the floating collar floating shoe, which is specifically as follows.

The repetitive switching valve 100 provided by the invention is arranged on the float collar float shoe and is connected with the sleeve string, and the repetitive switching valve 100 is in the second state at this time. The float collar float shoe with the repetitive switch valve 100 is put into the well, and at the moment, the repetitive switch valve 100 is in the second state, so that the underground fluid can automatically flow into the casing string, and the resistance of the underground fluid to the casing string is reduced.

After the casing string is put into place, fluid exceeding the switching displacement is pumped into the casing string from the wellhead, so that the repeated switching valve 100 is switched to a first state, and the repeated switching valve 100 plays a role of a one-way valve at the moment, thereby being convenient for implementing the subsequent well cementation process.

If desired, fluid exceeding the switching displacement may again be pumped into the casing string from the wellhead, switching the repetitive switching valve 100 between the first and second states.

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

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A repetitive switching valve, comprising:

a valve body (1), wherein an overflow hole (11) is arranged at the end part of the valve body (1);

a valve core (2) arranged in the valve body (1) in an axially movable manner;

a valve rod (3) arranged in the valve body (1) in an axially movable manner, and

An elastic piece (4) for providing a pretightening force, wherein two axial end parts of the elastic piece (4) are respectively abutted against the valve rod (3) and the valve body (1);

In a first state, the upper end part of the valve rod (3) can be abutted against the valve core (2), so that the pretightening force of the elastic piece (4) is transmitted to the valve core (2), and the upper end part of the valve core (2) is in one-way sealing with the overflow hole (11);

In the second state, the valve rod (3) is not abutted against the valve core (2), and the pretightening force of the elastic piece (4) cannot be transmitted to the valve core (2), so that the valve core (2) is not sealed with the overflowing hole (11).

2. The repeated switching valve according to claim 1, wherein the valve body (1) comprises a middle section (12), a first through hole (121) is axially arranged on the middle section (12) in a penetrating way, the valve core (2) and the valve rod (3) are respectively positioned on the upper side and the lower side of the middle section (12),

In the first state, the upper end part of the valve rod (3) is axially abutted against the valve core (2) through the first through hole (121),

In the second state, the upper end of the valve rod (3) axially abuts the intermediate section (12) so as not to abut the valve core (2).

3. The repetitive switching valve according to claim 2, wherein a guide block (122) is provided in the first through hole (121),

A rotor sliding sleeve (31) is arranged at the upper end part of the valve rod (3), a plurality of second sliding grooves (311) in the axial direction are arranged on the side surface of the rotor sliding sleeve (31) along the circumferential direction, an abutting groove (312) is arranged between the adjacent second sliding grooves (311) at the upper end part of the rotor sliding sleeve (31),

In the first state, the second sliding groove (311) of the valve rod (3) is in fit connection with the guide block (122), so that the valve rod (3) can axially abut against the valve core (2) through the first through hole (121),

In the second state, the valve rod (3) rotates under the action of external force until the abutting groove (312) axially abuts against the guide block (122), so that the valve rod (3) is not abutted against the valve core (2).

4. A repetitive switching valve according to claim 3, wherein a stator sliding sleeve (21) is provided at the lower end of the valve core (2), a first sliding groove (211) for being adapted to be connected with the guide block (122) is provided at a side surface of the stator sliding sleeve (21), the stator sliding sleeve (21) is configured to be able to pass down through the first through hole (121) and push the valve rod (3), the valve rod (3) is rotated by a certain angle, and the valve rod (3) is switched between a first state and a second state.

5. The repetitive switching valve according to claim 4, wherein a plurality of switching grooves (212) are provided in the circumferential direction at the lower end portion of the stator sliding sleeve (21), the switching grooves (212) include a first guide slope (213), and the abutment grooves (312) include a second guide slope (313), and the lower end portion of the stator sliding sleeve (21) is fitted with the second guide slope (313) or the upper end portion of the rotor sliding sleeve (31) is fitted with the first guide slope (213) during the process of pushing the stator sliding sleeve (21) down on the valve rod (3), thereby rotating the rotor sliding sleeve (31) relative to the stator sliding sleeve (21) and thus rotating the valve rod (3).

6. The repetitive switching valve according to any one of claims 1 to 5, wherein the valve stem (3) is configured to be switchable between the first state and the second state in response to a displacement of downhole fluid.

7. The repetitive switching valve according to any one of claims 2 to 5, wherein the valve body (1) comprises a first valve section (13) located above the intermediate section (12), the flow-through aperture (11) being coaxially arranged within the first valve section (13).

8. The repetitive switching valve according to claim 7, wherein the overflow hole (11) is configured in a shape in which the diameter gradually decreases from bottom to top, and a plug (22) for closing the overflow hole (11) is provided at an upper end portion of the valve body (2).

9. The repetitive switching valve according to any one of claims 2 to 5, wherein the valve body (1) comprises a second valve section (14) located below the intermediate section (12), a second through hole (141) is coaxially arranged in the second valve section (14), and the valve rod (3) is axially movably arranged in the second through hole (141).

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