A segmented fracturing tool
By using a specialized tool to open the sliding sleeve assembly step by step, the problem of limited fracturing stages in existing technologies has been solved, enabling flexible internal and external connection and isolation of the sliding sleeve assembly, thereby improving fracturing efficiency and economy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING LANDY GREAT EXPLOIT SCI & TECH DEV
- Filing Date
- 2023-05-17
- Publication Date
- 2026-05-19
AI Technical Summary
In existing staged fracturing technology, as the number of fracturing stages increases, the size difference of the ball increases, which leads to an increase in the size requirements of the borehole and fracturing string, limiting the improvement of the number of fracturing stages and resulting in poor economic efficiency.
Specialized tools are used to open the sliding sleeve assembly step by step. There is no need for size differences between the sliding sleeve assemblies. Multi-stage fracturing is achieved by opening and closing the sliding sleeve assemblies step by step. The movement and connection of the sliding sleeve assemblies are controlled by soluble materials and limiting structures to achieve internal and external isolation.
It achieves unlimited fracturing stages, and allows for flexible connection or isolation between the inner and outer parts of the sliding sleeve assembly, thereby improving fracturing efficiency and economy.
Smart Images
Figure CN116517515B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fracturing equipment technology, and more particularly to equipment for staged fracturing, specifically a staged fracturing tool. Background Technology
[0002] Staged fracturing refers to dividing the reservoir into multiple stages, separating each stage, and performing fracturing operations on each stage separately. It is a common method for enhancing oil and gas production. Currently, the commonly used approach is to use separators to divide the annulus between the fracturing tubing and the wellbore. Sliding sleeves are installed within the tubing between each stage, as shown in Figure 1. From top to bottom, the inner diameter of the ball seat in each sliding sleeve decreases sequentially. In operation, the smallest ball is deployed first, entering the lowest sliding sleeve and cutting off the downward flow channel. Then, fluid is injected into the tubing, pushing the sliding sleeve downwards and opening the jet orifice on the tubing. High-pressure fluid is then injected into the reservoir through the tubing and jet orifice to perform fracturing. The next stage ball is then deployed to perform fracturing of the previous stage, and so on, fracturing stage by stage from bottom to top. In this method, the ball size decreases sequentially from top to bottom. When more layers are needed, the difference in ball size required also increases. Therefore, it is necessary to increase the borehole size during drilling and use larger diameter fracturing tubing during fracturing, which is uneconomical and limits the increase in the number of fracturing stages. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides a segmented fracturing tool that uses a specialized tool to open each sliding sleeve assembly step by step from top to bottom. The dimensions of each sliding sleeve assembly do not need to be different, and therefore, the total number of stages is unlimited.
[0004] The specific solution of the present invention is as follows:
[0005] A segmented fracturing tool includes a sliding sleeve assembly and an opening assembly. The sliding sleeve assembly comprises a first cylinder, a second cylinder, and a third cylinder, arranged sequentially from the outside to the inside, sealed together, and capable of relative axial movement. The first cylinder has a first jet hole on its side wall, and the second cylinder has a second jet hole on its side wall that is not connected to the first jet hole. The third cylinder wall does not seal the second jet hole. When the second cylinder moves axially relative to the first cylinder to its limit position, the first jet hole communicates with the second jet hole. When the third cylinder moves axially relative to the second cylinder to its limit position, the outer wall of the third cylinder seals the second jet hole. The opening assembly includes a cylindrical body. The peripheral side wall of the body is sequentially provided with a first rubber plug assembly, an active telescopic mechanism, a second rubber plug assembly, and a driven telescopic mechanism. Both the first and second rubber plug assemblies are capable of sliding and sealingly connecting with the inner wall of the third cylinder. The driven telescopic mechanism is drivenly connected to the active telescopic mechanism, and after connection, the main... When the active telescopic mechanism is in an extended state, the driven telescopic mechanism is in a retracted state; when the active telescopic mechanism is in a retracted state, the driven telescopic mechanism is in an extended state. When the active telescopic mechanism is outside the third cylinder, it is in a naturally extended state. The active telescopic mechanism in the extended state can enter the third cylinder under external force and transform into a retracted state. The driving force for the second cylinder to move axially relative to the first cylinder is less than the driving force for the third cylinder to move axially relative to the second cylinder. During the axial movement of the opening assembly along the sliding sleeve assembly, when the active telescopic mechanism enters the third cylinder and transforms into a retracted state, the driven telescopic assembly extends and abuts against the third cylinder, driving the third cylinder to move axially relative to the first cylinder. When the third cylinder moves axially relative to the second cylinder to its limit position, the active telescopic mechanism is in an extended state. The second cylinder or the third cylinder is made of a soluble material.
[0006] In one specific embodiment of the present invention, a transmission shaft, a first return spring, and a second return spring are further included to realize the transmission connection between the driven telescopic mechanism and the active telescopic mechanism via the transmission shaft and to reset the mechanism. The transmission shaft is movably arranged within the body along the axial direction of the body. The driven telescopic mechanism is transmissionally connected to the active telescopic mechanism via the transmission shaft. The first return spring is used to push the active transmission mechanism to move radially outward along the body. The second return spring is used to push the driven transmission mechanism to move radially inward along the body. In this embodiment, the transmission shaft can move in two directions: along the axial direction of the body and rotated about the central axis of the body, as detailed below:
[0007] The first configuration involves the active telescopic mechanism extending or retracting radially along the body, causing the drive shaft to move axially along the body; and the drive shaft moving axially along the body, causing the driven telescopic mechanism to extend or retract radially along the body. Specifically, the drive shaft includes two variable-diameter sections. Both the active and driven telescopic mechanisms abut against the outer wall of the drive shaft. When the active telescopic mechanism slides along one of the variable-diameter sections and moves closer to the central axis of the drive shaft, the driven telescopic mechanism slides along the other variable-diameter section and moves away from the central axis of the drive shaft.
[0008] In the first case, when the active telescopic mechanism extends or retracts radially along the body, it drives the transmission shaft to rotate along the axis of the body; when the transmission shaft rotates axially along the body, it drives the driven telescopic mechanism to extend or retract radially along the body.
[0009] In this invention, the active telescopic mechanism in its extended state can enter the third cylinder and transform into a retracted state under the push of an external force. Specifically, this includes at least the following two methods:
[0010] The first type: the active telescopic mechanism has an inclined surface on one side of the body radially outward, and the contact point between the active telescopic mechanism and the third cylinder port is located on the inclined surface.
[0011] The second type: the inner side of the third cylindrical port is an inclined surface, and the contact point between the active telescopic mechanism and the third cylindrical port is located on the inclined surface.
[0012] In this invention, the driving force for axial movement of the second cylinder relative to the first cylinder is less than the driving force for axial movement of the third cylinder relative to the second cylinder. Specifically, this includes the following two methods:
[0013] The first type: the first cylinder and the second cylinder are connected by a first shearable pin, and the second cylinder and the third cylinder are connected by a second shearable pin, wherein the shearing force for cutting the second shearable pin is greater than the shearing force for cutting the first shearable pin.
[0014] The second method involves the first cylinder, the second cylinder, and the third cylinder being connected by an expansion joint.
[0015] In this invention, the second cylinder has a limit position when it slides relative to the first cylinder, and this limit position needs to be limited by a limiting structure; in this invention, the third cylinder 1300 also has a limit position when it slides relative to the second cylinder 1200, and whether or not a limiting mechanism needs to be set for this limit position can be determined according to the specific situation.
[0016] Compared with the prior art, the present invention has the following advantages:
[0017] The opening tool of the present invention can open the inner and outer isolated sliding sleeve assembly to achieve fracturing, or after fracturing, increase the pressure to change the shape of the sliding sleeve assembly to achieve inner and outer isolation of the sliding sleeve assembly again. After that, the opening tool can pass through this sliding sleeve assembly and enter the next level sliding sleeve assembly to repeat the above actions. Therefore, when multiple sliding sleeve assemblies are set, the inner diameter of each sliding sleeve assembly can be the same, and the number of levels is not limited. Attached Figure Description
[0018] Figure 1 is a schematic diagram of the working state of the segmented fracturing tool of the present invention, wherein... Figure 1a This is a schematic diagram showing the active telescopic mechanism entering the sliding sleeve assembly in the open component. At this time, the active telescopic mechanism retracts and the driven telescopic mechanism extends. Figure 1b This is a schematic diagram showing the state in which the first jet hole and the second jet hole in the sliding sleeve assembly are connected after the first shear pin is cut off. Figure 1c A schematic diagram showing the state in which the third cylinder wall of the sliding sleeve assembly closes the second jet hole after the second shear pin is cut off; Figure 1d This is a schematic diagram showing the state of the component passing through the sliding sleeve component. At this time, the active telescopic mechanism extends and the driven telescopic mechanism retracts.
[0019] Figure 2 This is a schematic diagram of the sliding sleeve assembly in Figure 1;
[0020] Figure 3 is a schematic diagram of the tool's enabled state in Figure 1, wherein... Figure 3a This is a schematic diagram of the active telescopic mechanism in its naturally extended state. Figure 3b A schematic diagram showing the active telescopic mechanism in a compressed state;
[0021] Figure 4 These are schematic diagrams showing the contact states of different shaped active telescopic mechanisms with the third cylinder;
[0022] Figure 5 yes Figure 2 Schematic diagram of the structure of the third cylinder;
[0023] Figure 6 yes Figure 2 Schematic diagram of the structure of the second cylinder;
[0024] Figure 7 is Figure 2 Schematic diagram of the structure of the first cylinder;
[0025] In the diagram, the sliding sleeve assembly is 1000; the opening assembly is 2000.
[0026] First cylinder 1100; Second cylinder 1200; Third cylinder 1300; Main body 2100; First rubber plug assembly 2200; Active telescopic mechanism 2300; Second rubber plug assembly 2400; Driven telescopic mechanism 2500; Drive shaft 2600; First shearable pin 3100; Second shearable pin 3200; Limiting ring 4100; Annular step 4200;
[0027] First jet hole 1110; second jet hole 1210; guide plate 1310; variable diameter part 2610; first return spring 2710; second return spring 2720. Detailed Implementation
[0028] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "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. They should not be construed as limitations on this invention.
[0030] Example
[0031] Please refer to Figures 1 to 7. The segmented fracturing tool of the present invention includes a sliding sleeve assembly 1000 and an opening assembly 2000. In use, the opening assembly 2000 is moved axially along the sliding sleeve assembly 1000 by hydraulic drive. The active telescopic mechanism 2300 and the driven telescopic mechanism 2500 of the opening assembly 2000 are linked, such as... Figure 1a As shown, when the active telescopic mechanism 2300 enters the third cylinder 1300 and becomes retracted, the driven telescopic mechanism 2500 becomes extended, thereby driving the third cylinder 1300 and the second cylinder 1200 to move together along the axial direction of the first cylinder 1100 to their limit positions. In this position, as... Figure 1b As shown, the first jet orifice 1110 and the second jet orifice 1210 are connected to perform fracturing operations; after fracturing is completed, the liquid pressure is further increased, and the opening component 2000 is used to push the third cylinder 1300 axially to its limit position relative to the second cylinder 1200. In this position, as follows... Figure 1dAs shown, the wall of the third cylinder 1300 is sealed with the second jet hole 1210, and the sliding sleeve assembly 1000 is isolated inside and out, so the fluid will not leak out. At the same time, the active telescopic mechanism 2300 comes to the outside of the third cylinder 1300 and returns to its natural state, that is, the extended state, thereby driving the driven telescopic mechanism 2500 to change to the contracted state. In this way, the opening assembly 2000 can pass through the hollow part of the third cylinder 1300 and start the next stage of fracturing construction at the next stage sliding sleeve assembly 1000.
[0032] In this invention, the first cylinder 1100, the second cylinder 1200, and the third cylinder 1300 are all components of the sliding sleeve assembly 1000, such as... Figure 2 As shown, the three components are arranged sequentially from the outside to the inside, sealed together, and capable of relative movement along the axial direction. The first cylinder 1100 has a first jet hole 1110 on its side wall, and the second cylinder 1200 has a second jet hole 1210 on its side wall. Figure 1a , Figure 2 As shown, in the initial state, the second jet hole 1210 is not connected to the first jet hole 1110, and the wall of the third cylinder 1300 does not seal the second jet hole 1210. Therefore, the fluid in the sliding sleeve assembly 1000 can enter the second jet hole 1210 but cannot communicate with the outside of the sliding sleeve assembly 1000, so the internal fluid will not leak out. Furthermore, the driving force for the second cylinder 1200 to move axially relative to the first cylinder 1100 is less than the driving force for the third cylinder 1300 to move axially relative to the second cylinder 1200. Therefore, when the first cylinder 1100 is fixed and a small axial thrust (less than the driving force for the third cylinder 1300 to move axially relative to the second cylinder 1200) is applied to the third cylinder 1300, it can push the third cylinder 1300 and the second cylinder 1200 together to move axially along the first cylinder 1100 to their limit positions. During the movement, there is no relative displacement between the third cylinder 1300 and the second cylinder 1200. When the limit positions are reached, the second jet hole 1210 communicates with the first jet hole 1110, and the third cylinder 1300 does not close the second jet hole 1210, thereby achieving internal and external communication of the sliding sleeve assembly 1000. Figure 1b As shown, fracturing operations can be performed. After fracturing, the axial thrust applied to the third cylinder 1300 is increased to be equal to the driving force that drives the third cylinder 1300 to move axially relative to the second cylinder 1200. The third cylinder 1300 will move axially relative to the second cylinder 1200 to the limit position. When the limit position is reached, the second jet hole 1210 is connected to the first jet hole 1110, and the third cylinder 1300 closes the second jet hole 1210. This achieves internal and external isolation of the sliding sleeve assembly 1000. Therefore, fluid will not leak from here when the next stage of fracturing is performed, and it will not affect the next stage of fracturing.
[0033] As shown in Figure 3, the opening component 2000 of the present invention includes a cylindrical body 2100. The peripheral sidewalls of the body 2100 are sequentially provided with a first rubber plug assembly 2200, an active telescopic mechanism 2300, a second rubber plug assembly 2400, and a driven telescopic mechanism 2500. Both the first rubber plug assembly 2200 and the second rubber plug assembly 2400 can be slidably and sealingly connected to the inner wall of the third cylinder 1300. Therefore, when they enter the third cylinder 1300, they can separate the liquid on both sides of the third cylinder 1300, and the fluid will not leak into the next formation section through the third cylinder 1300 during fracturing. The driven telescopic mechanism 2500 is drivenly connected to the active telescopic mechanism 2300. After connection, when the active telescopic mechanism 2300 is in an extended state, the driven telescopic mechanism 2500 is in a retracted state; when the active telescopic mechanism 2300 is in a retracted state, the driven telescopic mechanism 2500 is in an extended state. Figure 3a As shown, the active telescopic mechanism 2300, when located outside the third cylinder 1300, is in an extended state. In this extended state, it can enter the third cylinder 1300 under external force and then retract. During the axial movement of the opening assembly 2000 along the sliding sleeve assembly 1000, when the active telescopic mechanism 2300 enters the third cylinder 1300 and retracts, the driven telescopic assembly 2500 extends and abuts against the third cylinder 1300, driving the third cylinder 1300 to move axially relative to the first cylinder 1100. When the third cylinder 1300 moves axially to its limit relative to the second cylinder 1200, the active telescopic mechanism 2230 is in an extended state, thereby driving the driven telescopic mechanism 2500 to retract, allowing the entire opening assembly 2000 to pass through the hollow portion of the third cylinder 1300.
[0034] In this invention, during later oil extraction, the sliding sleeve assembly 1000 needs to be connected internally and externally so that fluid in the formation can flow into the sliding sleeve assembly 1000 and rise along the tubing to the surface. Therefore, in some embodiments, the second cylinder 1200 is made of a soluble material, and in other embodiments, the third cylinder 1300 is made of a soluble material. After dissolution, the sliding sleeve assembly 1000 can be connected internally and externally through the first jet hole 1110. There are various specific soluble materials, such as aluminum and other soluble materials, which are dissolved by injecting solvent later. Other soluble materials can also be used, which will automatically dissolve after a certain period of time. These will not be elaborated here.
[0035] In this invention, the driving force required to move the second cylinder 1200 axially relative to the first cylinder 1100 is less than the driving force required to move the third cylinder 1300 axially relative to the second cylinder 1200. The main purpose is to first move the second cylinder 1200 relative to the first cylinder 1100, and then move the third cylinder 1300 relative to the second cylinder 1200. There are various specific implementation methods, such as... Figure 2 As shown, a shearable pin is used to connect the second cylinder 1200 and the first cylinder 1100 via a first shearable pin 3100, and to connect the third cylinder 1300 and the second cylinder 1200 via a second shearable pin 3200. The shearing force required to cut the second shearable pin 3200 is greater than the shearing force required to cut the first shearable pin 3100. For example, the second shearable pin 3200 and the first shearable pin 3100 may be made of the same material, but the diameter of the second shearable pin 3200 is smaller than that of the first shearable pin 3100. Therefore, in use, the first shearable pin 3100 can be cut first to achieve relative movement between the first cylinder 1100 and the second cylinder 1200. Of course, the friction between the first cylinder 1100, the second cylinder 1200, and the third cylinder 1300 can also be controlled by tightening the connection, so that the friction between the second cylinder 1200 and the third cylinder 1300 is greater than the friction between the first cylinder 1100 and the second cylinder 1200.
[0036] In this invention, the second cylinder 1200 has a limit position when sliding relative to the first cylinder 1100, and the third cylinder 1300 also has a limit position when sliding relative to the second cylinder 1200. This limit position can be achieved by setting a limiting structure. The limiting structure is a conventional structure, and there are various specific configurations that can be freely selected by those skilled in the art. For example, a limiting ring 4100 can be set on the inner wall of the first cylinder 1100, or an annular step 4200 can be set on the second cylinder 1200. In addition, after setting the annular step 4200 on the second cylinder 1200, in order to facilitate the first rubber stopper assembly 2200 to pass through this annular step 4200 more smoothly, at least two guide plates 1310 extending axially are provided at one end of the third cylinder 1300. The guide plates 1310 are longitudinally spaced at a certain distance to form a gap, so that the fluid can communicate with the second jet hole 1210. In the initial state, one end of the guide plate 1310 extends to pass through the plane where the annular step 4200 is located.
[0037] In this invention, the active telescopic mechanism 2300, when in an extended state, is required to enter the third cylinder 1300 under external force and then retract. This can be achieved by controlling the shape and size of the active telescopic mechanism 2300 and the three cylinders 1300, for example... Figure 4 a, Figure 4 As shown in Figure b, the active telescopic mechanism 2300 has an inclined surface on one side radially outward from the main body 2100, and the contact point between the active telescopic mechanism 2300 and the port of the third cylinder 1300 is located on the inclined surface. For example... Figure 4 As shown in Figure c, the inner side of the port of the third cylinder 1300 is an inclined surface, and the contact point between the active telescopic mechanism 2300 and the port of the third cylinder 1300 is located on the inclined surface.
[0038] In this invention, the driven telescopic mechanism 2500 and the active telescopic mechanism 2300 are connected by a transmission shaft. A return spring is used to actuate the relevant components, ensuring that the driven telescopic mechanism 2500 is in a retracted state and the active telescopic mechanism 2300 is in an extended state in its natural state. The transmission shaft can employ two transmission methods. The first method involves the active telescopic mechanism 2300 extending or retracting, driving the transmission shaft 2600 to move axially along the body 2100. This axial movement of the transmission shaft 2600 then drives the driven telescopic mechanism 2500 to extend or retract radially along the body 2100. Specifically, this can be achieved by setting an inclined plane, allowing the radial movement of the active telescopic mechanism 2300 to be converted into the movement of the transmission shaft 2600 by sliding along the inclined plane. The axial movement of 600, as shown in Figure 1, involves a drive shaft 2600 comprising two variable diameter sections 2610. Both the active telescopic mechanism 2300 and the driven telescopic mechanism 2500 abut against the outer wall of the drive shaft 2600. When the active telescopic mechanism 2300 slides along one of the variable diameter sections 2610 and moves closer to the central axis of the drive shaft 2600, the driven telescopic mechanism 2500 slides along the other variable diameter section 2610 and moves away from the central axis of the drive shaft. Conversely, when the active telescopic mechanism 2300 slides along one of the variable diameter sections 2610 and moves away from the central axis of the drive shaft 2600, the driven telescopic mechanism 2500 slides along the other variable diameter section 2610 and moves closer to the central axis of the drive shaft 2600. The return spring can be located in multiple positions. For example, as shown in Figure 1, a first return spring 2710 can be used to push the drive shaft 2600 downwards, and a second return spring 2720 can be used to push the driven transmission mechanism 2500 towards the central axis of the drive shaft 2600. Alternatively, when the active telescopic mechanism 2300 extends or retracts, it drives the drive shaft 2600 to rotate. When the drive shaft 2600 rotates axially, it drives the driven telescopic mechanism 2500 to extend or retract radially along the body 2100. The specific structure will not be described in detail here.
[0039] In some embodiments, the first cylinder 1100 has connecting portions at both ends for connecting to upstream and downstream tubular columns (not shown in the figure).
[0040] The above description is merely a preferred 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 embodiments of 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 staged fracturing tool, characterized in that, Includes a sliding sleeve assembly and an opening assembly, wherein, The sliding sleeve assembly includes a first cylinder, a second cylinder, and a third cylinder arranged sequentially from the outside to the inside, sealed together, and capable of axially moving relative to each other. The side wall of the first cylinder is provided with a first jet hole, the side wall of the second cylinder is provided with a second jet hole that is not connected to the first jet hole, and the wall of the third cylinder does not seal the second jet hole. When the second cylinder moves axially relative to the first cylinder to its limit position, the first jet hole and the second jet hole are connected. When the third cylinder moves axially relative to the second cylinder to its limit position, the outer wall of the third cylinder seals the second jet hole. The second cylinder or the third cylinder is made of a soluble material. The opening assembly includes a cylindrical body, with a first rubber plug assembly, an active telescopic mechanism, a second rubber plug assembly, and a driven telescopic mechanism sequentially arranged on the peripheral sidewalls of the body; both the first and second rubber plug assemblies are slidably and sealingly connected to the inner wall of the third cylinder; the driven telescopic mechanism is drivenly connected to the active telescopic mechanism, and when the active telescopic mechanism is in an extended state, the driven telescopic mechanism is in a retracted state, and when the active telescopic mechanism is in a retracted state, the driven telescopic mechanism is in an extended state; when the active telescopic mechanism is outside the third cylinder, it is in a naturally extended state, and when the active telescopic mechanism is in an extended state, it can enter the third cylinder under the push of an external force and change to a retracted state; The driving force for the second cylinder to move axially relative to the first cylinder is less than the driving force for the third cylinder to move axially relative to the second cylinder. During the axial movement of the opening component along the sliding sleeve component, when the active telescopic mechanism enters the third cylinder and changes to a retracted state, the driven telescopic mechanism extends to abut against the third cylinder and can drive the third cylinder to move axially relative to the first cylinder. When the third cylinder moves axially relative to the second cylinder to its limit position, the active telescopic mechanism is in an extended state. The segmented fracturing tool further includes a drive shaft, a first return spring, and a second return spring. The drive shaft is movably arranged within the body along the axial direction of the body. The driven telescopic mechanism is connected to the active telescopic mechanism via the drive shaft. The first return spring is used to push the active telescopic mechanism to move outward along the radial direction of the body. The second return spring is used to push the driven telescopic mechanism to move inward along the radial direction of the body. The drive shaft includes two variable diameter sections. Both the active telescopic mechanism and the driven telescopic mechanism abut against the outer wall of the drive shaft. When the active telescopic mechanism slides along one of the variable diameter sections and moves closer to the central axis of the drive shaft, the driven telescopic mechanism slides along the other variable diameter section and moves away from the central axis of the drive shaft.
2. The segmented fracturing tool according to claim 1, characterized in that, When the active telescopic mechanism extends or retracts radially along the body, it drives the transmission shaft to move axially along the body; when the transmission shaft moves axially along the body, it drives the driven telescopic mechanism to extend or retract radially along the body.
3. A segmented fracturing tool according to claim 1, characterized in that, When the active telescopic mechanism extends or retracts radially along the body, it drives the transmission shaft to rotate along the body axis; when the transmission shaft rotates axially along the body, it drives the driven telescopic mechanism to extend or retract radially along the body.
4. A segmented fracturing tool according to claim 1, characterized in that, The active telescopic mechanism has an inclined surface on one side of the main body in the radial direction outward, and the contact point between the active telescopic mechanism and the port of the third cylinder is located on the inclined surface.
5. A segmented fracturing tool according to claim 1, characterized in that, The inner side of the third cylindrical port is an inclined surface, and the contact point between the active telescopic mechanism and the third cylindrical port is located on the inclined surface.
6. A segmented fracturing tool according to claim 1, characterized in that, The first cylinder and the second cylinder are connected by a first shearable pin, and the second cylinder and the third cylinder are connected by a second shearable pin, and the shearing force for cutting the second shearable pin is greater than the shearing force for cutting the first shearable pin.
7. A segmented fracturing tool according to claim 1, characterized in that, The first cylinder, the second cylinder, and the third cylinder are connected by an expansion joint.
8. A segmented fracturing tool according to claim 1, characterized in that, It includes a first limiting structure for limiting the extreme position of the second cylinder relative to the first cylinder in axial movement.