Downhole circulating hydraulic flow diverter

Abstract

The application discloses a downhole circulating hydraulic shunt tool, and relates to the shunt field.The downhole circulating hydraulic shunt tool comprises an upper shell, a choke ring, a sliding inner cylinder, a bypass sleeve, a sliding sleeve, a connecting sleeve, a piston inner cylinder, an elastic element, a ball valve, a piston sleeve, a pushing sleeve, a lower shell, a switch assembly, a shunt valve seat and a cut-off valve seat.The sliding inner cylinder is provided with four shunt holes in the circumferential direction and moves axially in the upper shell; the shunt sleeve is used for controlling the opening and closing of the shunt holes; the sliding sleeve is provided with a steel ball raceway on the outer wall and is used for sliding limiting; the ball valve is located in the lower shell and is responsible for the opening and closing of the flow channel; and the shunt valve seat is located in the lower shell and is used for storing the damaged ball valve and realizing the shunt work.The application realizes the conversion between the flow-through state and the shunt state of the shunt tool through the hydraulic drive mechanical mechanism, the overall mechanical structure is simple, the energy loss is small, and the shunt tool can work cyclically at high temperature.

Description

Technical Field

[0001] This invention relates to the technical field of drilling tools, specifically to a downhole circulating hydraulic diversion tool. Background Technology

[0002] To achieve drilling design objectives, appropriate drilling tools need to be integrated into the drilling string. One type of downhole circulating hydraulic shunt tool allows for plugging and wellbore cleaning operations during drilling, completion, and workover phases without requiring tripping out of the well. Its most significant feature is its ability to perform plugging operations while drilling, protecting downhole instruments, shortening drilling cycles, and reducing well control risks.

[0003] In implementing the above drilling design, commonly used bypass valves currently suffer from at least the following problems:

[0004] 1. If the mechanical structure of the tool is poorly designed, it is prone to failure in complex working environments. Failure to quickly resolve the problem may result in huge economic losses and personnel injuries.

[0005] 2. Under high temperature and high pressure working conditions, drilling equipment such as electronic devices are prone to loss of control, leading to downhole accidents and environmental pollution.

[0006] 3. Due to site conditions, frequent tripping and switching of drilling tools are required during operations, which poses a well control risk.

[0007] Therefore, we propose a downhole circulating hydraulic diversion tool to address the problems mentioned above. Summary of the Invention

[0008] The embodiments of the present invention provide a downhole circulating hydraulic diversion tool. Through a mechanical structural design, the diversion tool can switch between three working states: flow state, partial diversion state, and diversion state. The entire device has a simple structure, which reduces the design and development cycle cost of the actuator. Furthermore, the hydraulic drive avoids the adverse effects of electronic equipment failure on downhole work and the environment.

[0009] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0010] A downhole circulating hydraulic diversion tool includes: an upper shell with four diversion holes circumferentially arranged and an internal step at the lower end;

[0011] A choke ring, installed inside the upper housing, is funnel-shaped and used to accumulate the pressure of the fluid in the upper part;

[0012] The sliding inner cylinder is installed inside the upper outer shell, with the choke ring installed at the upper end. It has four flow diversion holes in the circumference, can move axially, and has a middle flow channel.

[0013] The diversion sleeve is located inside the upper outer shell and outside the sliding inner cylinder. It has four diversion holes in the circumference and is connected in parallel with the diversion holes. It moves axially in cooperation with the sliding inner cylinder to realize the switching of three working states: flow, partial diversion and diversion.

[0014] A sliding sleeve, located inside the upper outer shell, is installed in parallel with the diversion sleeve. Its outer wall is provided with a steel ball raceway, which limits the movement when a downhole circulating hydraulic diversion tool switches working states.

[0015] A connecting sleeve is located inside the upper outer shell and is connected in parallel with the sliding sleeve. It is connected to the sliding inner cylinder through a threaded engagement and engages with the outer wall of the upper shaft end of the sliding inner cylinder to limit the axial displacement of the diversion sleeve and the sliding sleeve.

[0016] The piston inner cylinder is connected in parallel with the connecting sleeve to transmit the thrust from the upper end to the lower part;

[0017] An elastic element is located on the outer wall of the piston inner cylinder and is installed on the inner step at the lower end of the upper outer shell;

[0018] The piston sleeve is connected to the piston inner cylinder via a threaded connection.

[0019] The lower outer shell is connected to the lower end of the upper outer shell;

[0020] The push sleeve is located inside the lower outer shell and is installed at the lower end of the piston sleeve;

[0021] The ball valve sleeve is located inside the push sleeve;

[0022] A ball valve, installed inside the ball valve sleeve, is used to rotate and switch the intermediate flow channel to achieve the switching of three working states of a downhole circulating hydraulic diversion tool;

[0023] The diversion valve seat is located at the lower end of the ball valve sleeve and is connected to the lower outer shell by a threaded connection. It is funnel-shaped and can be collected when the ball valve is cut off and falls. It can also divert the flow through the internal circumferential diversion channel to prevent fluid blockage.

[0024] The shut-off valve seat is located at the lower part of the diversion valve seat and is connected to the lower housing by a threaded connection. It is funnel-shaped and can be collected when the ball valve breaks. It can also be diverted through the internal circumferential diversion channel to prevent fluid blockage.

[0025] The switch assembly, consisting of a push rod, a ball valve connecting rod, a ball valve rotating shaft, and a rebound element, is installed on the outer wall of the ball valve sleeve. The ball valve rotating shaft is connected to the ball valve and is used to control the rotation of the ball valve.

[0026] 2. Furthermore, the sliding inner cylinder has four diversion holes distributed circumferentially, which can realize three working states: flow, partial diversion, and diversion.

[0027] 3. Furthermore, the choke ring accumulates fluid pressure to push the sliding inner cylinder to move axially downward, thereby opening and closing the diversion hole. After the diversion work is completed, the pressure is released through the elastic element, and the sliding inner cylinder returns to its initial position.

[0028] 4. Furthermore, the inner diameter of the steel ball raceway limit on the outer wall of the sliding sleeve is larger than the diameter of the rolling steel ball, thereby maintaining different working states of the tool.

[0029] 5. Furthermore, the piston inner cylinder transmits the fluid pressure from the upper end to the lower end, while simultaneously compressing the elastic element.

[0030] 6. Further, the push sleeve moves axially downward under the action of fluid pressure, pushing the ball valve connecting rod in the switch assembly to rotate the ball valve and close the intermediate flow channel, thereby realizing the diversion operation. The rebound element releases the elastic force to rotate the ball valve and open the intermediate flow channel, thereby realizing the flow operation.

[0031] 7. Furthermore, the ball valve adopts a ceramic structure;

[0032] 8. Furthermore, the diversion valve seat is bolted to the lower housing. When the ball valve is cut off, it is stored and diverted through the circumferential diversion channel to prevent fluid blockage.

[0033] 9. Furthermore, the shut-off valve seat is bolted to the lower housing, and is stored when the ball valve is broken, and is diverted through the circumferential diversion channel to prevent fluid blockage.

[0034] This invention provides a downhole circulating hydraulic diversion tool. Through a mechanical structural design, the tool can switch between three working states: flow state, partial diversion state, and diversion state. The entire device has a simple design, reducing the design and development cycle cost of the actuator. Furthermore, the hydraulic drive avoids the adverse effects of electronic equipment failure on downhole operations and the environment. Fluid pressure drives the inner cylinder to move axially downward to open the diversion orifice, and the elastic element rebounds to return the inner cylinder to its initial position to close the diversion orifice. The working principle is simple and less prone to blockage, jamming, or other failures. The ceramic ball valve structure can withstand higher fluid pressures compared to other structures, preventing failures during operation. The ball valve is rotated using a switching assembly. The structural design is economical and environmentally friendly, allowing for unlimited cycle operation. In case of ball valve failure, the ball valve can be sheared by increasing the fluid pressure, causing it to fall into the diversion valve seat. Alternatively, the ball valve can be broken by throwing a ball, causing ceramic fragments to fall into the cut-off valve seat. Neither method affects the normal flow of fluid through the middle channel. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the flow state of a downhole circulating hydraulic diversion tool.

[0036] Figure 2 for Figure 1 Enlarged view of the structure of section A in the middle;

[0037] Figure 3 A schematic diagram of the switching assembly structure for the flow state of a downhole circulating hydraulic diversion tool;

[0038] Figure 4 This is a schematic diagram of the partial flow-diversion state of a downhole circulating hydraulic flow-diverting tool.

[0039] Figure 5 for Figure 4 Enlarged view of the structure of section B in the middle;

[0040] Figure 6 A schematic diagram of the switching assembly structure for a partial flow diversion state of a downhole circulating hydraulic flow diversion tool;

[0041] Figure 7 This is a schematic diagram of the flow-diverting state of a downhole circulating hydraulic flow-diverting tool.

[0042] Figure 8 for Figure 7 Enlarged view of the C-section structure;

[0043] Figure 9 A schematic diagram of the switching assembly structure for the diversion state of a downhole circulating hydraulic diversion tool;

[0044] Figure 10 This is a schematic diagram of the structure of a ball valve in a downhole circulating hydraulic diversion tool when it is sheared off.

[0045] Figure 11 Schematic diagram of the sliding sleeve

[0046] The above figures include the following reference numerals: 1-choke ring; 2-sliding inner cylinder; 201, 202-diverting holes; 3-upper outer shell; 301, 302-diverting holes; 4-diverting sleeve; 401, 402-diverting holes; 5-sliding sleeve; 6-connecting sleeve; 7-piston inner cylinder; 8-elastic element; 9-piston sleeve; 10-push sleeve; 11-ball valve sleeve; 12-lower outer shell; 13-ball valve; 14-diverting valve seat; 15-cut-off valve seat; 16-switch assembly; 161-push rod; 162-ball valve connecting rod; 163-ball valve rotating shaft; 164-rebound element. Detailed Implementation

[0047] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0048] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Example

[0052] Please refer to Figures 1 to 11As shown, this embodiment provides a downhole circulating hydraulic diversion tool, including: an upper outer shell 3, with four diversion holes 301 and 302 circumferentially arranged and an internal step at the lower end; a choke ring 1, installed inside the upper outer shell 3, funnel-shaped, used to accumulate upper fluid pressure; a sliding inner cylinder 2, installed inside the upper outer shell 3, with the choke ring 1 mounted at the upper end, and four diversion holes 201 and 202 circumferentially arranged, capable of axial movement, and having a central flow channel; and a diversion sleeve 4, located inside the upper outer shell 3 and outside the sliding inner cylinder 2, with four diversion holes 401 and 402 circumferentially arranged and connected in parallel with the diversion holes 201 and 202, and connected to... The sliding inner cylinder 2 moves axially to switch between three working states: flow, partial diversion, and diversion. The sliding sleeve 5, located inside the upper outer shell 3, is installed parallel to the diversion sleeve 4. Its outer wall has a steel ball raceway 501, which limits movement during the switching of working states in this downhole circulating hydraulic diversion tool. The connecting sleeve 6, located inside the upper outer shell 1, is connected parallel to the sliding sleeve 5 and is threaded to the sliding inner cylinder 2. It engages with the outer wall of the upper shaft end of the sliding inner cylinder 2 to limit the axial displacement of the diversion sleeve 4 and the sliding sleeve 5. The piston inner cylinder 7, connected parallel to the connecting sleeve 6, transmits the thrust from the upper end to the lower end. The system comprises: an elastic element 8 located on the outer wall of the piston inner cylinder 7 and installed on the inner step at the lower end of the upper outer shell 3; a piston sleeve 9 connected to the piston inner cylinder 7 via a threaded connection; a lower outer shell 12 connected to the lower end of the upper outer shell 3; a push sleeve 10 located inside the lower outer shell 12 and installed at the lower end of the piston sleeve 9; a ball valve sleeve 11 located inside the push sleeve 10; a ball valve 13 installed inside the ball valve sleeve 11 for rotating and switching the intermediate flow channel to achieve switching between three working states of a downhole circulating hydraulic diversion tool; and a diversion valve seat 14 located at the lower end of the ball valve sleeve 11 and connected to the lower outer shell 12 via a threaded connection. The ball valve 13 is funnel-shaped and can be caught when it breaks and falls. It can also be diverted through its internal circumferential flow channel to prevent fluid blockage. The cut-off valve seat 15 is located below the diverter valve seat 14 and is connected to the lower housing 12 by a threaded connection. It is also funnel-shaped and can be caught when the ball valve 13 breaks. It can also be diverted through its internal circumferential flow channel to prevent fluid blockage. The switch assembly 16 consists of a push rod 161, a ball valve connecting rod 162, a ball valve rotating shaft 163, and a rebound element 164. It is installed on the outer wall of the ball valve sleeve 11. The ball valve rotating shaft 163 is connected to the ball valve 13 and is used to control the rotation of the ball valve 13.

[0053] In this embodiment, the upper outer shell 3 is provided with four diversion holes 301 and 302 in the circumferential direction. The sliding inner cylinder 2 and the diversion sleeve 4 are located inside the upper outer shell 3. At the same time, diversion holes 201, 202 and 401, 402 are provided in the circumferential direction respectively. The choke ring 1 is installed in the upper end of the sliding inner cylinder and is funnel-shaped to accumulate the upper fluid pressure.

[0054] Furthermore, in some implementations of this embodiment, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 , Figure 8 As shown, when the tool is in a flow state, the sliding inner cylinder 2 is located at the top of the upper outer shell 3, and the diversion holes 301 and 302 are closed. When the fluid pressure is increased, the choke ring 1 begins to push the sliding inner cylinder 2 and the diversion sleeve 4 axially downward. When the diversion holes 301 and 202 are connected through 402, the tool is in a partially diverted state. When the fluid pressure is further increased, the choke ring 1 continues to push the sliding inner cylinder 2 and the diversion sleeve 4 axially downward. When the diversion holes 301 and 201 are connected through 401, and the diversion holes 302 and 202 are connected through 402, the tool is in a diverted state.

[0055] In this embodiment, the sliding sleeve 5 is located inside the upper outer shell 3 and is installed in parallel with the diverter sleeve 4. The outer wall is provided with a steel ball raceway 501 to limit the movement when the tool switches working states. The connecting sleeve 6 is connected in parallel with the sliding sleeve 5 and is connected to the sliding inner cylinder 2 through a threaded fit. It cooperates with the outer wall of the upper shaft end of the sliding inner cylinder 2 to limit the axial displacement of the diverter sleeve 4 and the sliding sleeve 5. The elastic element 8 is located on the outer wall of the piston inner cylinder 7 and is installed on the inner step at the lower end of the upper outer shell 3.

[0056] Furthermore, in some implementations of this embodiment, such as Figure 1 , Figure 4 , Figure 7 , Figure 11 As shown, when the tool is in a flowing state, the limiting steel ball is located at point A of the steel ball raceway 501 on the outer wall of the sliding sleeve 5; when the fluid pressure increases and the tool is in a partially diverted state, the limiting steel ball is located at point B of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, and the elastic element 8 is compressed; when the fluid pressure continues to increase and the tool is in a diverted state, the limiting steel ball is located at point C of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, and the elastic element 8 continues to be compressed; when the fluid pressure decreases, the elastic element 8 releases its elastic force, the limiting steel ball is located at point D of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, and the tool returns to a partially diverted state; when the fluid pressure continues to decrease, the elastic element 8 continues to release its elastic force, the limiting steel ball is located at point A of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, and the tool returns to a flowing state.

[0057] In this embodiment, the piston inner cylinder 7 is connected in parallel with the connecting sleeve 6 to transmit the thrust from the upper end to the lower part; the piston sleeve 9 is connected to the piston inner cylinder 7 through a threaded fit; the push sleeve 10 is located inside the lower outer shell 12 and is installed at the lower end of the piston sleeve 9; the ball valve 13 is installed inside the ball valve sleeve 11 and is used to rotate and switch the intermediate flow channel to realize the switching of the three working states of the tool; the switch assembly 16 consists of a push rod 161, a ball valve connecting rod 162, a ball valve rotating shaft 163, and a rebound element 164, and is installed on the outer wall of the ball valve sleeve 11. The ball valve rotating shaft 163 is connected to the ball valve 13 and is used to control the rotation of the ball valve 13.

[0058] Furthermore, in some implementations of this embodiment, such as Figures 1-9 As shown, after the piston inner cylinder 7 is subjected to fluid pressure from the upper end, it begins to move axially downward. Since the upper conical surface diameter of the push sleeve 10 is larger than that of the piston sleeve 9, the push sleeve 10 begins to move axially downward with the piston inner cylinder 7.

[0059] Furthermore, in some implementations of this embodiment, such as Figures 1-9 As shown, the push sleeve 10 pushes the push rod 161 to move axially downward along the groove on the outer wall of the ball valve sleeve 11, thereby causing the ball valve connecting rod 162 to start rotating. The ball valve rotating shaft 163 slides in the middle groove of the ball valve connecting rod 162, causing the ball valve 13 to rotate. When the ball valve 13 rotates 40 degrees, the middle flow channel is partially closed, and the tool switches to a partial diversion state. At this time, the rebound element 164 is compressed. The push sleeve 10 continues to push the push rod 161 to move axially downward. When the ball valve 13 rotates 90 degrees, the middle flow channel is completely closed, and the tool switches to a diversion state. At this time, the rebound element 164 is compressed. When the fluid pressure drops, the rebound element 164 begins to release its elastic force, pushing the push rod 161 to move axially upward. The tool begins to switch to a partial diversion state, thereby restoring the flow state.

[0060] In this embodiment, the diversion valve seat 14 is located at the lower end of the ball valve sleeve 11 and is connected to the lower outer shell 12 by a threaded connection. It is funnel-shaped and can be collected when the ball valve 13 breaks and falls. The flow is diverted through the internal circumferential diversion channel to prevent fluid blockage. The cut-off valve seat 15 is located below the diversion valve seat 14 and is connected to the lower outer shell 12 by a threaded connection. It is funnel-shaped and can be collected when the ball valve 13 breaks. The flow is diverted through the internal circumferential diversion channel to prevent fluid blockage.

[0061] Furthermore, in some implementations of this embodiment, such as Figure 10As shown, due to the harsh working environment downhole, traditional mechanical transmission devices suffer from defects such as "jamming" and "malfunction." To prevent the entire drilling operation from halting due to transmission failure, ball valve 13 is made of ceramic material. This material has high strength, good high-temperature resistance, and can withstand high fluid pressure. When "jamming" occurs, the fluid pressure can be increased to shear the shear pins at both ends of ball valve 13. Ball valve 13 then falls with the fluid into the lower chamber of the diversion valve seat 14. At the same time, the inner wall of the diversion valve seat 14 has diversion channels distributed circumferentially. In this case, the fluid can flow smoothly out of the tool through the diversion channels. When "malfunction" occurs, a large-diameter steel ball can be inserted. Driven by the fluid, the kinetic energy of the steel ball will shatter ball valve 13. The ceramic fragments will fall with the fluid into the lower chamber of the cut-off valve seat 15. The lower chamber of the cut-off valve seat 15 has a groove to store the steel ball.

[0062] In summary, when the fluid pressure increases, the choke ring 1 accumulates pressure, and the sliding inner cylinder 2 and the diverting sleeve 4 begin to move axially downward, compressing the elastic element 8. Simultaneously, it transmits downward power, pushing the sleeve 10 to push the push rod 161 downward along the groove on the outer wall of the ball valve sleeve 11, compressing the rebound element 164. This also causes the ball valve 13 to rotate. When the ball valve 13 rotates 40 degrees, the rolling steel ball is located at point B of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, and the diverting holes 301 and 202 are connected through 402. At this time, the tool is in a partially diverted state. When the fluid pressure continues to increase, the elastic element 8 continues to be compressed, and the push rod 161 continuously moves downward, compressing the rebound element 164. When the ball valve rotates 90 degrees, the rolling steel ball is located at point C of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, and the diverting holes 301 and 202 are connected. 1 and 201 are connected through 401, while diversion holes 302 and 202 are connected through 402. At this time, the tool is in a diversion state. When the fluid pressure begins to drop, the rebound element 164 begins to release its elastic force, pushing the push rod 161 upward, thereby transmitting power upward to the push sleeve 10. The ball valve 13 begins to rotate in the reverse direction, and the sliding inner cylinder 2 and the diversion sleeve 4 begin to move axially upward. At the same time, the elastic element 8 also begins to release its elastic force, and the rolling steel ball rolls from point C to point D along the steel ball raceway 501 on the outer wall of the sliding sleeve 5. The tool switches back to a partial diversion state. When the fluid pressure drops to normal, the tool returns to a flow state. At this time, the rolling steel ball is located at point A of the steel ball raceway 501 on the outer wall of the sliding sleeve 5, the diversion holes 301 and 302 are closed, and the elastic force of the rebound element 164 and the elastic element 8 is fully released. When the ball valve fails to rotate, the fluid pressure can be increased to shear the ball valve or a ball can be thrown to break the ball valve, thus resolving the work accident. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A downhole circulating hydraulic diversion tool, comprising: The upper outer shell (3) has four diversion holes (301) and (302) in the circumferential direction, and an internal step at the lower end; A choke ring (1) is installed inside the upper housing (3) and is funnel-shaped, used to accumulate the pressure of the upper fluid; The sliding inner cylinder (2) is installed inside the upper outer shell (3) and located at the lower end of the choke ring (1). It has two identical diversion holes (201) and (202) on both sides of the circumference, which can move axially and have a middle flow channel. The diversion sleeve (4) is located inside the upper outer shell (3) and outside the sliding inner cylinder (2). Two identical diversion holes (401) and (402) are opened on both sides of the circumference, and are connected in parallel with the diversion holes (201) and (202), and move axially in cooperation with the sliding inner cylinder (2). The sliding sleeve (5) is located inside the upper outer shell (3) and is installed in parallel with the diversion sleeve (4). The outer wall is provided with a steel ball raceway (501). The connecting sleeve (6) is located inside the upper outer shell (3), communicates with the sliding sleeve (5), is connected to the sliding inner cylinder (2), and abuts against the outer wall of the upper shaft end of the sliding inner cylinder (2) to limit the axial displacement of the diversion sleeve (4) and the sliding sleeve (5); The piston inner cylinder (7) is connected to the connecting sleeve (6); The elastic element (8) is located on the outer wall of the piston inner cylinder (7) and installed inside the lower end of the upper outer shell (3). One end of the elastic element (8) abuts against the piston inner cylinder (7) and the other end abuts against the upper outer shell (3). The piston sleeve (9) is connected to the piston inner cylinder (7) mentioned above; The lower outer casing (12) is installed at the lower end of the upper outer casing (3); The push sleeve (10) is located inside the lower outer shell (12) and installed at the lower end of the piston sleeve (9); The ball valve sleeve (11) is located inside the push sleeve (10); A ball valve (13) is installed inside the ball valve sleeve (11) and is used to rotate and switch the intermediate flow channel; The diversion valve seat (14) is located at the lower end of the ball valve sleeve (11) and is connected to the lower outer shell (12) by threaded connection. The whole is funnel-shaped. When the ball valve (13) is cut off and falls, it can be stored and diverted through the internal circumferential diversion channel to prevent fluid blockage. The shut-off valve seat (15) is located at the lower part of the diversion valve seat (14) and is connected to the lower housing (12) by threaded connection. It is funnel-shaped and can be collected when the ball valve (13) breaks. It can also be diverted through the internal circumferential diversion channel (151) to prevent fluid blockage. A switch assembly (16) is installed on the outer wall of the ball valve sleeve (11), and the ball valve rotating shaft (163) is connected to the ball valve (13) to control the rotation of the ball valve (13).

2. The downhole circulating hydraulic diversion tool according to claim 1, characterized in that, The sliding inner cylinder (2) has four diversion holes (201) and (202) distributed circumferentially, which can realize three working states: flow, partial diversion and diversion.

3. The downhole circulating hydraulic diversion tool according to claim 2, characterized in that, The choke (1) accumulates fluid pressure to push the sliding inner cylinder (2) to move axially downward, thereby opening and closing the diversion holes (301) and (302). After the diversion work is completed, the pressure is released through the elastic element (8), and the sliding inner cylinder (2) returns to its initial position.

4. The downhole circulating hydraulic diversion tool according to claim 3, characterized in that, The inner diameter of the ball raceway (501) on the outer wall of the sliding sleeve is larger than the diameter of the rolling ball, thereby maintaining different working states of the tool.

5. A downhole circulating hydraulic diversion tool according to claim 3, characterized in that, The piston inner cylinder (7) transmits the fluid pressure from the upper end to the lower end, while simultaneously compressing the elastic element (8).

6. The downhole circulating hydraulic diversion tool according to claim 1, characterized in that, The push sleeve (10) moves axially downward under the action of fluid pressure, pushing the ball valve connecting rod (162) in the switch assembly (16) to rotate the ball valve (13) and close the intermediate flow channel to achieve diversion. The rebound element (164) releases the elastic force to rotate the ball valve (13) and open the intermediate flow channel to achieve flow.

7. A downhole circulating hydraulic diversion tool according to claim 6, characterized in that, The ball valve (13) is made of ceramic.

8. A downhole circulating hydraulic diversion tool according to claim 6, characterized in that, The diversion valve seat (14) is bolted to the lower housing (12). When the ball valve (13) is cut off, it is stored and diverted through the circumferential diversion channel to prevent fluid blockage.

9. A downhole circulating hydraulic diversion tool according to claim 6, characterized in that, The shut-off valve seat (15) is bolted to the lower housing (12). When the ball valve (13) is broken, it is stored and diverted through the circumferential diversion channel to prevent fluid blockage.

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