Harmer damping valve and full-hydraulic while-drilling jar

Abstract

The invention relates to a jar damper valve and a full-hydraulic while-drilling jar, the jar damper valve comprises a front valve body, a middle valve body and a rear valve body, one side of the middle valve body is fixedly connected with the front valve body, and the other side of the middle valve body is fixedly connected with the rear valve body; a control unit and an execution unit are arranged in a first cavity formed by the front valve body and the middle valve body, and the control unit is used for receiving instruction control of a ground control system and controlling the execution unit to rotate according to a control instruction; a valve element is arranged in a second cavity formed by the middle valve body and the rear valve body in a sealed mode, the execution unit rotates to drive the valve element to rotate, and the valve element rotates to change the flow of slurry passing through the damping valve. According to the damping valve, the flow of mud passing through the damping valve can be adjusted and changed through the ground after a pipe column is stuck, so that the magnitude of release force of a jar is changed, and the pipe column is released when the pipe column is stuck.

Description

Technical Field

[0001] The invention belongs to the technical field of downhole tools for oil production, and in particular relates to a jar damping valve and a full hydraulic drilling jar. Background Art

[0002] In the process of drilling operations, we often encounter the phenomenon of stuck drill caused by improper selection of drilling fluid, irregular operation, unstable formation and other factors. If the stuck drill cannot be released in time, it is easy to cause the wellbore to be scrapped, thus causing economic losses. There are many ways to release the stuck drill. Commonly used methods include bath well release, use of jar release, active drilling tool release, etc. Among them, using jar release is a quick and efficient way to solve the stuck drill accident.

[0003] The fully hydraulic drilling jar has been widely used due to its advantages such as being able to vibrate at any time when a drill bit is stuck, having a good sealing structure during drilling, and having stable performance. The fully hydraulic drilling jar has the ability to handle drill bit sticking accidents in the first time, realizing the continuity and convenience of oil drilling projects and greatly reducing the cost of domestic oil drilling.

[0004] In the prior art, fully hydraulic drilling jars are Figure 1 As shown, it includes a jar body 01 and a jar damping valve 02. The jar damping valve has a through hole for mud to flow. The size of the through hole is related to the size of the jar release force. Therefore, if the jar release force needs to be adjusted, the damping valve in the jar needs to be replaced before going down the well. This will cause problems such as the jar release force cannot be adjusted in time if the drill bit stuck force is large during the drilling process, and the jar release force cannot be compensated after the viscosity of the hydraulic oil decreases after multiple jarring, resulting in a decrease in the jar release force. Summary of the invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a jar damping valve and a fully hydraulic drilling jar. The damping valve of the present invention can change the flow of mud passing through the damping valve after the pipe string is stuck through ground adjustment, thereby changing the size of the jar release force and achieving the unblocking of the stuck pipe string.

[0006] According to one aspect of the present invention, a jar damping valve is provided, comprising a front valve body, an intermediate valve body and a rear valve body, one side of the intermediate valve body is fixedly connected to the front valve body, and the other side of the intermediate valve body is fixedly connected to the rear valve body; wherein,

[0007] A control unit and an execution unit are arranged in the first cavity formed by the front valve body and the middle valve body, and the control unit is used to receive a control command from a ground control system and control the rotation of the execution unit according to the control command;

[0008] A valve core is sealed in the second cavity formed by the middle valve body and the rear valve body. The rotation of the actuator unit can drive the valve core to rotate, and the rotation of the valve core can change the flow of mud passing through the damping valve.

[0009] Furthermore, the execution unit includes a stepper motor fixed in the first cavity, the stepper motor is connected to the control unit, the control unit is used to drive the stepper motor to rotate and supply power to the stepper motor, the motor shaft of the stepper motor is fixedly connected with an internal gear, the internal gear is meshingly connected with an outer gear ring, the rotation of the outer gear ring can drive the valve core to rotate, and the outer gear ring is limited in the first cavity along its axial direction.

[0010] Furthermore, the control unit includes a control module and a battery module fixed in the first cavity, the control module is connected to the stepper motor, the control module is used to receive control commands from a ground control system and control the rotation of the stepper motor according to the control commands, the battery module is connected to the control module and the stepper motor, and the battery module is used to power the control module and the stepper motor.

[0011] Furthermore, an arc groove is provided on the front valve body, and the arc groove extends from the middle of the front valve body to the direction close to the middle valve body and passes through the front valve body. The battery module is fixed in the arc groove, and a motor bracket is fixedly connected to the side wall of the arc groove. The stepper motor is fixed on one side of the motor bracket close to the middle valve body, and the control module is fixed on the other side of the motor bracket.

[0012] Furthermore, an annular groove is provided on one side of the intermediate valve body close to the front valve body, and the annular groove and the arc groove form the first cavity. The inner gear and the outer gear ring are both arranged in the annular groove, and a limiting step is provided on the side wall of the annular groove. The outer gear ring is axially limited between the limiting step and the bottom wall of the annular groove.

[0013] Furthermore, a plurality of driving magnetic poles are fixedly provided on the outer gear ring, and the plurality of driving magnetic poles are evenly distributed in a ring shape on a side of the outer gear ring close to the valve core with the axis of the outer gear ring as the center; a plurality of driven magnetic poles are fixedly provided on a side of the valve core close to the outer gear ring, and the driven magnetic poles correspond to the driving magnetic poles one by one, and the rotation of the outer gear ring drives the valve core to rotate through the driving magnetic poles and the driven magnetic poles.

[0014] Furthermore, a valve body inlet is provided on the middle valve body, a valve body outlet is provided on the rear valve body, a plurality of valve body channels are evenly opened on the valve core, each of the valve body channels extends to pass through the valve core, each of the valve body channels can connect the valve body inlet and the valve body outlet, the apertures of any two valve body channels are not equal, the valve core rotates to connect the valve body inlet and the valve body outlet through valve body channels of different apertures to change the flow rate of mud passing through the valve body, the aperture of the valve body inlet is greater than or equal to the maximum aperture of the apertures of the valve body channels, and the aperture of the valve body outlet is greater than or equal to the maximum aperture of the apertures of the valve body channels.

[0015] Furthermore, the apertures of the plurality of valve core channels increase in sequence from the smallest aperture to the largest aperture in a counterclockwise direction.

[0016] Furthermore, a mounting groove is provided on one side of the intermediate valve body close to the rear valve body, and the mounting groove and the rear valve body cooperate to form a second cavity for accommodating the valve core; the inner ring of the valve core is provided with an inner sealing groove, and the outer ring of the valve core is provided with an outer sealing groove, an inner sealing ring is provided in the inner sealing groove, and an outer sealing ring is provided in the outer sealing groove, and the valve core is sealed and connected to the side wall of the second cavity through the inner sealing ring and the outer sealing ring.

[0017] Furthermore, a valve core shoulder is provided at one end of the valve core close to the rear valve body, a rear valve body shoulder is provided on the rear valve body, and the valve core shoulder and the rear valve body shoulder cooperate with each other; the front valve body and the intermediate valve body are threadedly connected, and the intermediate valve body is threadedly connected to the rear valve body.

[0018] The present invention also provides a fully hydraulic drilling jar, comprising the jar damping valve described in any one of the above.

[0019] It can be seen from the above technical solutions that the jar damping valve and the fully hydraulic drilling jar provided by the present invention have the following beneficial effects:

[0020] The damping valve of the present invention can change the flow of mud passing through the damping valve after the pipe string is stuck through ground adjustment, thereby changing the magnitude of the release force of the jar, and realizing the release of the stuck pipe string. In addition, the present invention can realize multi-level adjustment of the shock force of the jar in the well on the ground;

[0021] The present invention can compensate for the reduction of the jarring force, and solves the problem that the jarring release force is reduced and cannot be compensated for after the viscosity of the hydraulic oil is reduced after multiple jarring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of a fully hydraulic drilling jar in the prior art;

[0023] Figure 2 is an axonometric view of a jar damping valve according to an embodiment of the present invention;

[0024] Figure 3 is a full cross-sectional view of the jar damping valve according to an embodiment of the present invention along the axial direction;

[0025] Figure 4 for Figure 3 A partial enlarged view of point D in the middle;

[0026] Figure 5 for Figure 3 A partial enlarged view of point E in the middle;

[0027] Figure 6 It is a left side view of the jar damping valve according to an embodiment of the present invention;

[0028] Figure 7 It is a right side view of the jar damping valve according to an embodiment of the present invention;

[0029] Figure 8 for Figure 3 Sectional view in the AA direction;

[0030] Fig. 9 for Figure 3 Cross-sectional view in the BB direction;

[0031] Fig.10 for Figure 3 Cross-sectional view in CC direction;

[0032] Fig.11 A cross-sectional view of a fully hydraulic drilling jar according to an embodiment of the present invention;

[0033] Fig.12 yes Fig.11 A partial enlarged view of the F in the middle;

[0034] The reference numerals in the figure are: front valve body 1, outer gear ring 2, middle valve body 3, valve core 4, outer sealing groove 5, outer sealing ring 6, rear valve body 7, stepper motor 8, internal gear 9, driving magnetic pole 10, inner sealing groove 11, inner sealing ring 12, arc groove 13, battery module 14, control module 15, motor bracket 16, annular groove 17, valve body inlet 18, driven magnetic pole 19, valve core channel 20, valve core shoulder 21, rear valve body shoulder 22, valve body outlet 23; jar body 01, damping valve 02. DETAILED DESCRIPTION

[0035] In order to better understand the purpose, structure and function of the present invention, a jar damping valve and a fully hydraulic drilling jar of the present invention are further described in detail below with reference to the accompanying drawings.

[0036] Figure 2is an axonometric view of a jar damping valve according to an embodiment of the present invention, Figure 3 It is a full axial cross-sectional view of the jar damping valve of an embodiment of the present invention. Specifically, the jar damping valve 02 of the embodiment of the present invention includes a front valve body 1, an intermediate valve body 3 and a rear valve body 7, one side of the intermediate valve body 3 is fixedly connected to the front valve body 1, and the other side of the intermediate valve body 3 is fixedly connected to the rear valve body 7; wherein, a control unit and an execution unit are arranged in a first cavity formed by the front valve body 1 and the intermediate valve body 3, and the control unit is used for receiving command control from a ground control system and controlling the rotation of the execution unit according to the control command; a valve core 4 is sealed in a second cavity formed by the intermediate valve body 3 and the rear valve body 7, and the rotation of the execution unit can drive the rotation of the valve core 4, and the rotation of the valve core 4 can change the flow rate of mud passing through the damping valve.

[0037] The damping valve of this embodiment includes a front valve body 1, an intermediate valve body 3 and a rear valve body 7. The control unit and the execution unit are arranged in a first cavity formed by the front valve body 1 and the intermediate valve body 3, wherein the control unit is used to receive control instructions from the ground control system and to control the rotation of the execution unit; the valve core 4 is arranged in a second cavity formed by the intermediate valve body 3 and the rear valve body 7, and the rotation of the execution unit drives the valve core 4 to rotate, and the rotation of the valve core 4 can change the flow rate of the mud passing through the damping valve, and the flow rate of the mud passing through the damping valve is related to the release force of the jar, so by changing the flow rate of the mud passing through the damping valve, the release force of the jar is changed accordingly.

[0038] During specific use, for the jar with the damping valve of this embodiment, if the jar is still not unstuck after the drill is stuck and the pipe is lifted up, a control command is issued through the ground control system. After receiving the control command, the control unit of the damper controls the actuator to rotate, thereby finally changing the flow rate of the mud passing through the damping valve. Then, the pipe is lifted up again to determine whether the jar is unstuck after being acted upon. If it is still not unstuck, the above process is repeated until the pipe is unstuck.

[0039] The damping valve of this embodiment can change the flow rate of mud passing through the damping valve through ground adjustment after the pipe string is stuck, thereby changing the size of the jar release force, solving the problem in the prior art that after the pipe string is stuck, the jar release force is too small to unblock the pipe string, and it is impossible to try to unblock the pipe string by changing the jar release force. At the same time, this embodiment can compensate for the reduction in jarring force, solving the problem that the jar release force is reduced due to the reduction in hydraulic oil viscosity after multiple jarring, and the jar release force cannot be compensated.

[0040] Among them, Figure 4 , Fig. 9As shown, the execution unit includes a stepper motor 8 fixed in the first cavity, the stepper motor 8 is connected to the control unit, the control unit is used to drive the stepper motor 8 to rotate and supply power to the stepper motor 8, the motor shaft of the stepper motor 8 is fixedly connected with an internal gear 9, the internal gear 9 is meshingly connected with an outer gear ring 2, the rotation of the outer gear ring 2 can drive the valve core 4 to rotate, and the outer gear ring 2 is limited in the first cavity along its axial direction.

[0041] Specifically, the execution unit includes a stepper motor 8, an internal gear 9 and an outer gear ring 2, wherein the stepper motor 8 is connected to the control unit to drive the stepper motor 8 to rotate through the control unit, the internal gear 9 is fixed on the motor shaft of the stepper motor 8, and the rotation of the stepper motor 8 drives the internal gear 9 to rotate, and the outer gear ring 2 is meshed with the internal gear 9, so the rotation of the internal gear 9 will correspondingly drive the outer gear ring 2 to rotate, and the rotation of the outer gear ring 2 will rotate the valve core 4.

[0042] Among them, Figure 4 , Figure 5 , Fig. 9 , Fig.10 As shown, a plurality of driving magnetic poles 10 are fixedly provided on the outer gear ring 2, and the plurality of driving magnetic poles 10 are evenly distributed in a ring shape on the side of the outer gear ring 2 close to the valve core 4 with the axis of the outer gear ring 2 as the center; a plurality of driven magnetic poles 19 are fixedly provided on the side of the valve core 4 close to the outer gear ring 2, and the driven magnetic poles 19 correspond to the driving magnetic poles 10 one by one. The rotation of the outer gear ring 2 drives the valve core 4 to rotate through the driving magnetic poles 10 and the driven magnetic poles 19.

[0043] In this embodiment, the outer gear ring 2 rotates to drive the valve core 4 to rotate through the driving magnetic pole 10 and the driven magnetic pole 19. The driving magnetic pole 10 is evenly distributed on the side of the outer gear ring 2 close to the valve core 4, and the driven magnetic pole 19 is evenly distributed on the side of the valve core 4 close to the outer gear ring 2. The rotation of the outer gear ring 2 correspondingly drives the driving magnetic pole 10 to rotate, and the rotation of the driving magnetic pole 10 drives the driven magnetic pole 19 to rotate through the principle of opposite charges attracting and like charges repelling, thereby realizing the rotation of the valve core 4.

[0044] In a specific implementation, for example, 12 driving magnetic poles 10 are arranged on the outer gear ring 2, and the 12 driving magnetic poles 10 are evenly distributed on the outer gear ring 2 in a ring shape with the axis of the outer gear ring 2 as the center, that is, the angle between the line connecting each driving magnetic pole 10 and the center of the outer gear ring 2 and the line connecting the adjacent driving magnetic pole 10 and the center of the outer gear ring 2 is 30 degrees; 12 driven magnetic poles 19 are correspondingly arranged on the valve core 4.

[0045] Among them, Figure 3 , Figure 4 , Figure 6 As shown, the intermediate valve body 3 is provided with a valve body inlet 18; Figure 3 , Figure 4 , Figure 7 As shown, the rear valve body 7 is provided with a valve body outlet 23; Fig.10 As shown, a plurality of valve core channels 20 are evenly opened on the valve core 4, each valve core channel 20 extends to penetrate the valve core 4, each valve core channel 20 can connect the valve body inlet 18 and the valve body outlet 23, the apertures of any two valve core channels 20 are not equal, the valve core 4 rotates to connect the valve body inlet 18 and the valve body outlet 23 through the valve core channels 20 of different apertures to change the flow rate of the mud passing through the valve body, the aperture of the valve body inlet 18 is greater than or equal to the maximum aperture of the apertures of the valve core channel 20, and the aperture of the valve body outlet 23 is greater than or equal to the maximum aperture of the apertures of the valve core channel 20.

[0046] Specifically, the middle valve body 3 is provided with a valve body inlet 18, through which the mud enters, and the rear valve body 7 is provided with a valve body outlet 23, through which the mud flows out, and the aperture of the valve body inlet 18 is greater than or equal to the maximum aperture of the apertures of the valve core channel 20, and the aperture of the valve body outlet 23 is greater than or equal to the maximum aperture of the apertures of the valve core channel 20, so that the valve body inlet 18 and the valve body outlet 23 will not affect the flow of the mud, that is, the size of the mud flow through the damping valve is completely determined by the valve core channel 20. Between the valve body inlet 18 and the valve body outlet 23 is a second cavity formed by the middle valve body 3 and the rear valve body 7, and the valve core 4 is arranged in the second cavity. The valve core channel 20 on the valve core 4 connects the valve body inlet 18 and the valve body outlet 23, so that after the mud passes through the valve body inlet 18, it flows out of the valve body outlet 23 through the valve core channel 20. The apertures of each valve core channel 20 are not equal, so the valve core channels 20 with different apertures connect the valve body inlet 18 and the valve body outlet 23 to achieve the purpose of allowing mud with different flow rates to flow through.

[0047] Once again, the meshing of the inner gear 9 and the outer gear ring 2 can realize the purpose of the inner gear 9 driving the outer gear ring 2 to rotate, thereby transmitting the output torque of the stepper motor 8 to the outer gear ring 2. The outer gear ring 2 cooperates with the valve core 4, and the rotation of the outer gear ring 2 drives the valve core 4 to rotate through the magnetic field, thereby transmitting the torque to the valve core 4 again. The rotation of the valve core 4 can realize the purpose of connecting the valve body inlet 18 and the valve body outlet 23 through the valve core channel 20 of different apertures, thereby realizing the purpose of changing the mud flow through the damping valve.

[0048] In a specific implementation, for the plurality of valve core channels 20 on the valve core 4, for example, the apertures of the plurality of valve core channels 20 increase in sequence from the smallest aperture in a counterclockwise direction to the largest aperture. As an alternative, the apertures of the plurality of valve core channels 20 may also increase in sequence from the smallest aperture in a clockwise direction to the largest aperture.

[0049] During specific use, for the jar with the damping valve of this embodiment, for example, the valve core channel 20 is first adjusted to the minimum aperture, and the valve core 4 rotates clockwise to realize that the aperture of the valve core channel 20 connecting the valve body inlet 18 and the valve body outlet 23 becomes larger in sequence, and 10 valve core channels 20 are evenly opened on the valve core 4. If the jar is still not unstuck after the jar is activated after the drill is stuck, a control command is issued through the ground control system. After receiving the control command, the control unit of the damper controls the stepper motor 8 to rotate clockwise. First, the stepper motor 8 is controlled to rotate 360° / 10 to allow the valve core channel 20 with a larger aperture to connect the valve body inlet 18 and the valve body outlet 23. Then, the pipe is lifted again to determine whether it is unstuck after the jar is activated. If it is still not unstuck, the stepper motor 8 is controlled to rotate 360° / 10 clockwise again, and the above process is repeated until the pipe is unstuck.

[0050] Among them, Figure 2 , Figure 3 , Figure 4 As shown, the control unit includes a control module 15 and a battery module 14 fixed in the first cavity. The control module 15 is connected to the stepper motor 8. The control module 15 is used to receive command control from the ground control system and control the rotation of the stepper motor 8 according to the control command. The battery module 14 is connected to the control module 15 and the stepper motor 8. The battery module 14 is used to power the control module 15 and the stepper motor 8.

[0051] In this embodiment, the control unit includes a control module 15 and a battery module 14, wherein the lead wires of the battery module 14 are connected to the control module 15 and the stepper motor 8, the battery module 14 is used to provide power for the control module 15 and the stepper motor 8, the lead wires of the control module 15 are connected to the stepper motor 8, and the control module 15 is used to control the rotation of the stepper motor 8 according to the control instructions received from the ground control system.

[0052] Among them, Figure 8 As shown, an arc groove 13 is opened on the front valve body 1, and the arc groove 13 extends from the middle of the front valve body 1 to the direction close to the middle valve body 3 and penetrates the front valve body 1. The battery module 14 is fixed in the arc groove 13, and the side wall of the arc groove 13 is fixedly connected to the motor bracket 16. The stepper motor 8 is fixed on one side of the motor bracket 16 close to the middle valve body 3, and the control module 15 is fixed on the other side of the motor bracket 16.

[0053] The arc groove 13 on the front valve body 1 is used to place the stepper motor 8, the control module 15 and the battery module 14. Specifically, the battery module 14 is connected to the bottom wall of the arc groove 13 of the front valve body 1 by bolts, and the motor bracket 16 is connected to the side wall of the arc groove 13 of the front valve body 1 by bolts; the control module 15 and the stepper motor 8 are respectively installed on the left and right sides of the motor bracket 16 by bolts, and in order to facilitate the engagement of the internal gear 9 on the stepper motor 8 with the inner and outer gear rings 2 of the middle valve body 3, the stepper motor 8 is fixed on the side of the motor bracket 16 close to the middle valve body 3.

[0054] Among them, Figure 2 , Figure 3 , Fig. 9 As shown, an annular groove 17 is provided on one side of the middle valve body 3 close to the front valve body 1, and the annular groove 17 and the arc groove 13 form a first cavity. The internal gear 9 and the outer gear ring 2 are both arranged in the annular groove 17, and a limiting step is provided on the side wall of the annular groove 17. The outer gear ring 2 is axially limited between the limiting step and the bottom wall of the annular groove 17.

[0055] Among them, a mounting groove is opened on one side of the middle valve body 3 close to the rear valve body 7, and the mounting groove and the rear valve body 7 cooperate to form a second cavity for accommodating the valve core 4; Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the inner ring of the valve core 4 is provided with an inner sealing groove 11, the outer ring of the valve core 4 is provided with an outer sealing groove 5, the inner sealing groove 11 is provided with an inner sealing ring 12, the outer sealing groove 5 is provided with an outer sealing ring 6, and the valve core 4 is sealed and connected to the side wall of the second cavity through the inner sealing ring 12 and the outer sealing ring 6.

[0056] In this embodiment, the inner sealing ring 12 and the outer sealing ring 6 are provided to achieve a sealed connection between the valve core 4 and the side wall of the second cavity, thereby isolating the pressure before and after the valve core 4 so that mud can only pass through the valve core channel 20 .

[0057] Among them, Figure 2 , Figure 4 As shown, a valve core shoulder 21 is provided at one end of the valve core 4 close to the rear valve body 7, and a rear valve body shoulder 22 is provided on the rear valve body 7, and the valve core shoulder 21 and the rear valve body shoulder 22 cooperate with each other; the front valve body 1 and the middle valve body are threadedly connected, and the middle valve body 3 and the rear valve body 7 are threadedly connected.

[0058] Specifically, the valve core shoulder 21 and the rear valve body shoulder 22 cooperate to form a set of thrust bearings for damping the axial pressure caused by the pressure difference before and after the damper.

[0059] The damping valve of this embodiment can change the flow rate of mud passing through the damping valve after the pipe string is stuck through ground adjustment, thereby changing the size of the jar release force to achieve the unsticking of the stuck pipe string, and this embodiment can realize multi-level adjustment of the jar force on the ground; at the same time, this embodiment can compensate for the reduction of the jar force, which solves the problem that the jar release force is reduced due to the reduction of the viscosity of the hydraulic oil after multiple jarring, and the jar release force cannot be compensated.

[0060] The embodiment of the present invention also provides a fully hydraulic drilling jar, such as Fig.11 , Fig.12 As shown, it includes the jar damping valve 02 of any one of the above embodiments.

[0061] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0062] In addition, the terms "one", "two", etc. 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. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] In this application, 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A jar damping valve, characterized in that: It comprises a front valve body, a middle valve body and a rear valve body, one side of the middle valve body is fixedly connected to the front valve body, and the other side of the middle valve body is fixedly connected to the rear valve body; wherein, A control unit and an execution unit are arranged in the first cavity formed by the front valve body and the middle valve body, and the control unit is used to receive a control command from a ground control system and control the rotation of the execution unit according to the control command; A valve core is sealed in the second cavity formed by the middle valve body and the rear valve body. The rotation of the actuator unit can drive the valve core to rotate, and the rotation of the valve core can change the flow of mud passing through the damping valve.

2. The jar damping valve according to claim 1, characterized in that: The execution unit includes a stepper motor fixed in the first cavity, the stepper motor is connected to the control unit, the control unit is used to drive the stepper motor to rotate and supply power to the stepper motor, the motor shaft of the stepper motor is fixedly connected with an internal gear, the internal gear is meshingly connected with an external gear ring, the rotation of the external gear ring can drive the valve core to rotate, and the external gear ring is limited in the first cavity along its axial direction.

3. The jar damping valve according to claim 2, characterized in that: The control unit includes a control module and a battery module fixed in the first cavity. The control module is connected to the stepper motor. The control module is used to receive control commands from a ground control system and control the rotation of the stepper motor according to the control commands. The battery module is connected to the control module and the stepper motor. The battery module is used to power the control module and the stepper motor.

4. The jar damping valve according to claim 3, characterized in that: An arc groove is provided on the front valve body, and the arc groove extends from the middle of the front valve body to the direction close to the middle valve body and passes through the front valve body. The battery module is fixed in the arc groove, and a motor bracket is fixedly connected to the side wall of the arc groove. The stepper motor is fixed on one side of the motor bracket close to the middle valve body, and the control module is fixed on the other side of the motor bracket.

5. The jar damping valve according to claim 4, characterized in that: An annular groove is provided on one side of the intermediate valve body close to the front valve body, and the annular groove and the arc groove form the first cavity. The inner gear and the outer gear ring are both arranged in the annular groove, and a limiting step is provided on the side wall of the annular groove. The outer gear ring is axially limited between the limiting step and the bottom wall of the annular groove.

6. The jar damping valve according to claim 2, characterized in that: A plurality of driving magnetic poles are fixedly arranged on the outer gear ring, and the driving magnetic poles are evenly distributed in a ring shape with the axis of the outer gear ring as the center on one side of the outer gear ring close to the valve core; a plurality of driven magnetic poles are fixedly arranged on one side of the valve core close to the outer gear ring, and the driven magnetic poles correspond to the driving magnetic poles one by one, and the rotation of the outer gear ring drives the valve core to rotate through the driving magnetic poles and the driven magnetic poles.

7. The jar damping valve according to claim 1, characterized in that: The intermediate valve body is provided with a valve body inlet, the rear valve body is provided with a valve body outlet, a plurality of valve core channels are evenly opened on the valve core, each of the valve core channels extends to penetrate the valve core, each of the valve core channels can connect the valve body inlet and the valve body outlet, the apertures of any two valve core channels are not equal, the valve core rotates to connect the valve body inlet and the valve body outlet through valve core channels of different apertures to change the flow rate of mud passing through the valve body, the aperture of the valve body inlet is greater than or equal to the maximum aperture of the apertures of the valve core channels, and the aperture of the valve body outlet is greater than or equal to the maximum aperture of the apertures of the valve core channels.

8. The jar damping valve according to claim 7, characterized in that: The apertures of the plurality of valve core channels increase in sequence from the smallest aperture to the largest aperture in a counterclockwise direction.

9. The jar damping valve according to claim 1, characterized in that: The middle valve body is provided with an installation groove on one side close to the rear valve body, and the installation groove and the rear valve body cooperate to form a second cavity for accommodating the valve core; the inner ring of the valve core is provided with an inner sealing groove, and the outer ring of the valve core is provided with an outer sealing groove, an inner sealing ring is provided in the inner sealing groove, and an outer sealing ring is provided in the outer sealing groove, and the valve core is sealed and connected to the side wall of the second cavity through the inner sealing ring and the outer sealing ring.

10. The jar damping valve according to claim 9, characterized in that: A valve core shoulder is provided at one end of the valve core close to the rear valve body, a rear valve body shoulder is provided on the rear valve body, the valve core shoulder and the rear valve body shoulder cooperate with each other; the front valve body and the intermediate valve body are threadedly connected, and the intermediate valve body is threadedly connected to the rear valve body.

11. A fully hydraulic drilling jar, characterized in that: The invention comprises a jar damping valve as described in any one of claims 1 to 10.

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