Unlimited-stage large-pass intelligent dart-type fracturing sliding sleeve

Abstract

The application discloses an infinite-stage large-drift-diameter intelligent dart-type fracturing sliding sleeve and relates to the field of oil and gas field fracturing. The infinite-stage large-drift-diameter intelligent dart-type fracturing sliding sleeve comprises a sliding cylinder, a fracturing hole, a sliding seat, a dart and a shear pin body. A sealing plate is arranged on the sliding cylinder at the fracturing hole. The end face of the sealing plate is wrapped with the sliding seat. The sliding seat is used for driving the sealing plate to slide horizontally. A shear pin hole is formed on the sliding cylinder at the sliding seat. A shear pin groove is formed on the sliding seat at the shear pin hole. A shutter is slidably arranged on the sliding seat at the shear pin groove. After the dart is seated, the dart-type fracturing sliding sleeve forms a guiding effect on the particulate impurities in the well hole, fundamentally blocks the path of the debris into the fitting gap, and the shear pin body is sheared through the sliding seat. In the process, the shear pin body falls into the shear pin groove. The shutter on the sealing plate is inserted into the first sliding groove through the limiting of the sliding seat groove, and the broken shear pin body is enclosed in the closed cavity formed by the shear pin groove and the shutter.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field fracturing, specifically to an infinitely large-diameter intelligent dart-type fracturing sleeve. Background Technology

[0002] Fracturing sleeves are the core downhole tools for segmented fracturing in horizontal wells of oil and gas fields. Installed on the completion string, they are used to precisely control the opening and closing of the channel for fracturing fluid to enter the target formation, enabling segmented and layered volumetric fracturing. The main types are ball-drop fracturing sleeves and dart-type fracturing sleeves. Because the inner diameter of the ball seat in ball-drop fracturing sleeves decreases step by step, and balls are dropped from large to small, the overall number of segments is limited, and the subsequent drilling and removal of the ball seat is too complicated. Therefore, the mainstream fracturing method at present is the dart-type fracturing sleeve.

[0003] Existing dart-type fracturing sleeves, in the initial stage, are similar to ball-throwing type sleeves, using a slide block to seal the fracturing orifice (see appendix for details). Figure 13 The dart carries an electronic code and relies on an internal pressure pulse signal to cooperate only with the code groove in the corresponding level of slide block. When fracturing fluid is pumped into the wellhead, the pressure is slowly increased to 20-30MPa. The dart descends with the fracturing fluid and passes through each level of slide block in sequence. At each slide block, the dart interacts with the slide block identification module for verification. If there is a mismatch, the dart passes directly through the slide block without affecting it. If there is a match, the identification module triggers a command for the dart to fall into the slide block, completely blocking the central flow channel. Then, fracturing fluid is pumped into the wellhead, causing its internal pressure to rise rapidly to 30-50MPa. At this time, the pressure of the fracturing fluid acts on the end face of the slide block, causing it to shear the shear pin. The slide block itself moves axially, exposing the fracturing hole, thus completing one fracturing operation. The above workflow is repeated until all fracturing operations are completed. However, during fracturing, the fracturing hole is sealed solely by the slide block. When the slide cylinder enters the wellbore, some particulate impurities on its inner wall enter the fracturing hole. When the slide block shears the shear pins and moves to one side, hard particles will be mixed between the slide block and the slide cylinder as it slides. The relative movement constantly squeezes and grinds, scraping and plowing the outer wall of the slide block and the inner wall of the slide cylinder, forming axial scratches and pits. The fit clearance is reduced due to the scratches, which affects the fracturing work of the subsequent fracturing fluid. When there are many impurities, the slide cylinder may be directly jammed by the impurities and unable to move, thus causing the entire slide sleeve to fail completely. Furthermore, when the shear pins break under the action of the slide block, they will remain inside the slide cylinder and move back and forth under pressure, which will also damage the precision sealing surfaces of the outer wall of the slide block and the inner wall of the slide cylinder.

[0004] In summary, when the existing fracturing sleeve moves to one side after the shear pin breaks off, hard particles will be mixed between the slide block and the slide cylinder and slide along with it. When the shear pin breaks under the action of the slide block, it will remain inside the slide cylinder. During the sliding process, the particle impurities and shear pin will damage the precision sealing surface of the outer wall of the slide block and the inner wall of the slide cylinder, affecting the subsequent fracturing operation of the fracturing fluid. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide an infinitely large-diameter intelligent dart-type fracturing sleeve to solve the technical problems that when the fracturing sleeve moves to one side after the shear pin is cut off, hard particles will be mixed between the slide block and the slide cylinder and slide along with it. Furthermore, when the shear pin breaks under the action of the slide block, it will remain inside the slide cylinder, which will damage the precision sealing surface between the outer wall of the slide block and the inner wall of the slide cylinder, thus affecting the subsequent fracturing operation of the fracturing fluid.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an infinite-level large-diameter intelligent dart-type fracturing sleeve, comprising a sliding cylinder, a fracturing hole, a sliding seat, a dart, and a shearing nail body. A sealing plate is horizontally slidably disposed on the sliding cylinder at the fracturing hole. One side of the sealing plate wraps around the end face of the sliding seat. The sliding seat is used to drive the sealing plate to slide horizontally. A shearing nail hole is opened on the sliding cylinder at the sliding seat. A shearing nail groove is opened on the sliding seat at the shearing nail hole. A cover plate is slidably disposed on the sliding seat at the shearing nail groove. The cover plate is used to close the top of the shearing nail groove. One end of the cover plate extends through to one side of the sealing plate.

[0007] By adopting the above technical solution, the sealing plate and the slide block are tightly fitted together to form a physical barrier to the inside of the fracturing hole, preventing it from intruding into the sliding gap. After the dart lands, when the slide block slides to one side, it guides the particulate impurities in the wellbore, causing them to flow along the outer wall of the slide block away from the sliding gap, fundamentally blocking the path of debris intruding into the fitting gap. The shearing pin body will be sheared by the slide block. During this process, the shearing pin body will fall into the shearing pin groove, preventing fragments from splashing into the wellbore or sliding gap. The baffle on the sealing plate will be inserted into the first sliding groove through the limiting of the slide block groove. After the slide block completes the fracturing hole opening action, it will seal the broken shearing pin body in the closed cavity formed by the shearing pin groove and the baffle.

[0008] The present invention is further configured such that there are two sets of shear pin holes, both located at the top of the slide cylinder, and the shear pin holes are threadedly connected to the shear pin body.

[0009] Preferably, only two sets are provided, which reduces the number of shear pin holes opened on the outer wall of the slide. This arrangement greatly improves the pressure resistance of the slide itself, and the function of the shear pin is to be sheared by pressure to unlock the slide. The shearing force of this local shear pin is just right to match the design pressure.

[0010] The present invention is further configured such that one side of the slide has an arc-shaped end face, wherein one end of the sealing plate and the arc-shaped end face of the slide are on the same vertical plane.

[0011] Preferably, the arc-shaped end face facilitates the guidance of particulate impurities falling through the fracturing hole to one side, effectively preventing some particulate impurities from entering the sliding gap. Furthermore, the sealing plate always blocks the outer wall of the slide block during the sliding process, ensuring that no particulate impurities are carried during the movement of the slide block.

[0012] The invention is further configured such that a second sliding groove is provided on the sliding cylinder at the sealing plate, wherein one end of the second sliding groove is provided with a slot for the sealing plate to slide horizontally.

[0013] Preferably, the sealing plate slides horizontally within the slide cylinder under the action of the second slide groove, while the slot on one side facilitates the movement of the sealing plate by the slide block.

[0014] The present invention is further configured such that the depth of the clipper groove is greater than the length of the clipper body, and the clipper groove is open.

[0015] Preferably, when the shear bolt body breaks under the pressure of fracturing fluid, since the shear bolt body is at the top of the slide, its own weight causes the broken part of the shear bolt body to fall into the shear bolt groove at the bottom, where it is collected. At the same time, the open design facilitates the guidance of the shear bolt body, allowing it to fall stably into the shear bolt groove. Furthermore, it ensures that the broken shear bolt does not obstruct the subsequent movement of the cover plate.

[0016] The present invention is further configured such that the sealing plate and the shear nail body are misaligned.

[0017] Preferably, the staggered arrangement ensures that the sealing plate will not obstruct the shear nail body when it is slidably installed, thus improving the overall conversion efficiency of the device.

[0018] The invention is further configured such that the inner wall of the slide is provided with an encoding groove, and the outer wall of the dart is provided with an encoding that cooperates with the encoding groove.

[0019] Preferably, the setting of the code and the code slot facilitates stable engagement between the slide and the dart, while maintaining a large diameter on the inner wall of the slide cylinder, so as not to affect the early operations such as cementing and logging. The code and the code slot are matched by pressure pulse signal.

[0020] The present invention is further configured such that a first sliding groove is horizontally provided on the slide block at the shearing nail groove, wherein the first sliding groove is located on the upper part of the side wall of the shearing nail groove and is provided through, and the first sliding groove is used for the cover plate to slide.

[0021] Preferably, the first groove ensures that the cover plate can be stably guided, and during the process of the slide groove squeezing the cover plate, the first groove may block the top of the shear nail groove.

[0022] The present invention is further configured such that the clipper body and the clipper hole are sealed together.

[0023] Preferably, the sealing design ensures the stability of the internal seal and maintains a seal between the shear bolt body and the shear bolt hole even when the shear bolt body breaks, further improving the overall fracturing effect.

[0024] In summary, the present invention has the following main beneficial effects: 1. This invention provides a second sliding groove at the fracturing hole, with a sealing plate slidably installed inside. Under normal conditions, the sealing plate and the slide block are tightly fitted together, forming a physical barrier to the inside of the fracturing hole, blocking particulate impurities in the wellbore from entering the sliding gap. After the dart is seated, when the slide block slides to one side, it will drive the sealing plate to move accordingly. In this process, it does not hinder the conduction of the fracturing hole, and through its cooperation with the arc-shaped end face of the slide block, it guides the particulate impurities in the wellbore, causing them to flow along the outer wall of the slide block to the side away from the sliding gap. This fundamentally blocks the path of debris entering the fitting gap, effectively preventing the formation of axial scratches and pits during the movement of the slide block, and ensuring the sealing between the slide block and the slide cylinder. 2. This invention features a shearing screw groove on the slide block, with one end of the shearing screw body fixed within the groove. This provides reliable axial positioning and locking of the slide block during normal operation, preventing accidental movement. As the hydraulic pressure during fracturing increases, the shearing screw body is sheared by the slide block. During this process, the shearing screw body falls into the shearing screw groove, preventing fragments from splashing into the wellbore or sliding gap. Furthermore, as the sealing plate moves to one side with the slide block, the baffle on the sealing plate is inserted into the first sliding groove through the limiting action of the slide block groove. After the slide block completes the fracturing hole opening action, the baffle completely covers the top opening of the shearing screw groove, sealing the broken shearing screw body within the closed cavity formed by the shearing screw groove and the baffle. This achieves in-situ, residue-free collection of shearing screw fragments and prevents damage to the precision sealing surfaces of the slide block's outer wall and the inner wall of the slide cylinder by the shearing screw body, further improving the overall fracturing effect. Attached Figure Description

[0025] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the slide block in its initial state according to the present invention; Figure 4For the present invention Figure 3 Enlarged image in the image; Figure 5 This is a schematic diagram of the structure of the present invention in the open state of the fracturing hole; Figure 6 This is an experimental diagram of the structure of the shield in its initial state according to the present invention; Figure 7 For the present invention Figure 6 Enlarged view of B in the middle; Figure 8 This is a schematic diagram of the structure of the present invention under the condition of collecting broken shear pins; Figure 9 This is an internal view of the slide block of the present invention; Figure 10 This is a schematic diagram of the sealing plate and shield structure of the present invention; Figure 11 This is a cross-sectional view of the shear pin groove and fracturing hole of the present invention; Figure 12 For the present invention Figure 11 Enlarged view of C; Figure 13 This is a schematic diagram of the slide fracturing hole structure in the prior art of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. Slide cylinder; 2. Connector; 3. Slide seat groove; 4. Fracturing hole; 5. Shear nail hole; 6. Slide seat; 7. Coding groove; 8. Sealing plate; 9. Cover plate; 10. Shear nail body; 11. First slide groove; 12. Shear nail groove; 13. Second slide groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The embodiments of the present invention will now be described.

[0029] Example 1: Please refer to Figures 1-12The diagram shows an infinite-level large-diameter intelligent dart-type fracturing sleeve, comprising a slide cylinder 1, a connector 2, a fracturing hole 4, a sliding mechanism, a sealing mechanism, and a shielding component. The connector 2 is threadedly connected to the slide cylinder 1. According to the actual needs of the wellbore, the operator matches slide cylinders 1 of different lengths and splices them together. Then, the slide cylinder 1 is horizontally transported into the wellbore by a hoisting device. At this time, the slide seat 6 inside the slide cylinder 1 completely blocks the fracturing hole 4. The operator throws the intelligent dart into the interior of the slide cylinder 1 and pumps fracturing fluid into the slide cylinder 1, causing the fracturing fluid to slowly increase the pressure to the set value of 25MPa. At this time, the fracturing fluid pushes the intelligent dart to slide inside the slide cylinder 1. A sealing plate 8 is horizontally slidably installed on the slide cylinder 1 at the fracturing hole 4. One side of the sealing plate 8 wraps around the end face of the slide seat 6. Under normal conditions, the sealing plate 8 and the slide seat 6 are tightly fitted to form a physical barrier to the inside of the fracturing hole 4, blocking particulate impurities in the wellbore to the outside of the fracturing hole 4 and preventing them from intruding into the sliding gap. Meanwhile, a shearing pin hole 5 is provided at the top of the slide cylinder 1. The shearing pin body 10 is threadedly connected to the shearing pin hole 5. The shearing pin body 10 has a rated shear resistance, usually set in the range of 15-35 MPa. The well vibration, the fluid pressure inside the pipe, and the annular pressure in the wellbore are only 3-8 MPa, all far less than this shear force. Therefore, the shearing pin will not break, and the slide cylinder will always be locked. Since a slide seat 6 is provided in the slide seat groove 3, and an encoding groove 7 is provided on the inner wall of the slide seat 6, the dart... The outer wall is provided with a code that matches the coding groove 7. The code and coding groove 7 are designed to facilitate a stable engagement between the slide block 6 and the dart, while keeping the inner wall of the slide cylinder at a large diameter, so as not to affect the cementing, logging and other early operations. The code and coding groove 7 are matched by a pressure pulse signal. As the dart moves down with the fracturing fluid, it passes through each slide block 6 in sequence. At each slide block 6, the dart and the slide block 6 identification module interact to verify each other. If there is a mismatch, the slide block remains contracted and the dart passes through directly without affecting the slide block. When a match is successful, the recognition module triggers a command, causing the dart's code to engage with the code slot 7. At this moment, the petal-shaped claw inside the dart pops out instantly, forming an annular support in the center of the slide block 6. The annular support completely seals the central channel of the slide cylinder 1. At this time, the operator continues to pump fracturing fluid into the slide, and the fracturing fluid is slowly pressurized to the set value of 45MPa. At this time, the slide block 6 shears the shear pin body 10 under the pressure of the fracturing fluid, causing the slide block 6 to slide within the slide block groove 3. Simultaneously, one side of the slide block 6 will move the sealing plate 8 accordingly. During the movement, the fracturing hole 4 is not obstructed from being connected, and through its cooperation with the arc-shaped end face of the slide block 6, it guides the particulate impurities in the wellbore, causing them to flow along the outer wall of the slide block 6 to the side away from the sliding gap. This fundamentally blocks the path of debris intruding into the fitting gap, effectively preventing the formation of axial scratches and pits during the movement of the slide block 6. Furthermore, a shearing groove 12 is provided on the slide block 6 at the shearing hole 5. At this time, the broken shearing body 10 will fall into the shearing groove 12, preventing fragments from splashing into the wellbore or the sliding gap. Meanwhile, a baffle 9 is slidably disposed on the slide block 6 at the shear nail groove 12. The baffle 9 is used to close the top of the shear nail groove 12, and one end of the baffle 9 extends through to one side of the sealing plate 8. When the sealing plate 8 moves to one side with the slide block 6, the baffle 9 on the sealing plate 8 will be inserted into the first slide groove 11 through the limiting of the slide block groove 3. When the slide block 6 completes the fracturing hole opening action, the baffle completely covers the top opening of the shear nail groove 12, sealing the broken shear nail body 10 in the closed cavity formed by the shear nail groove 12 and the baffle 9. This achieves in-situ collection of shear nail fragments without residue, and at the same time prevents the shear nail body 10 from damaging the precision sealing surface of the outer wall of the slide block 6 and the inner wall of the slide cylinder 1, further improving the overall fracturing effect.

[0030] For details regarding the above embodiments, please refer to [link / reference]. Figure 3 and Figure 4 The slide block 6 has an arc-shaped end face on one side, and one end of the sealing plate 8 is on the same vertical plane as the arc-shaped end face of the slide block 6. The arc-shaped end face facilitates the guidance of particulate impurities falling through the fracturing hole 4 to one side, effectively preventing some particulate impurities from entering the sliding gap. Furthermore, the sealing plate 8 always blocks the outer wall of the slide block 6 during the sliding process, ensuring that no particulate impurities are carried during the movement of the slide block 6.

[0031] For details regarding the above embodiments, please refer to [link / reference]. Figure 7The depth of the shear spike groove 12 is greater than the length of the shear spike body 10. When the shear spike body 10 breaks under the pressure of fracturing fluid, since the shear spike body 10 is at the top of the slide cylinder 1, the broken part of the shear spike body 10 will fall into the shear spike groove 12 at the bottom under its own weight. The shear spike groove 12 is open to guide the shear spike body 10 and make it fall stably into the shear spike groove 12. It also makes it easy for the broken shear spike body 10 to not obstruct the cover plate 9 when it moves.

[0032] For details regarding the above embodiments, please refer to [link / reference]. Figure 9 and Figure 12 A first sliding groove 11 is horizontally provided on the slide block 6 at the shear pin groove 12. The first sliding groove 11 is located on the upper part of the side wall of the shear pin groove 12 and is through it. The first sliding groove 11 allows the cover plate 9 to slide. The first sliding groove 11 ensures that the cover plate 9 can be stably guided. During the process of the slide block groove 3 squeezing the cover plate 9, the first sliding groove 11 can block the top of the shear pin groove 12. At the same time, a second sliding groove 13 is provided on the slide cylinder 1 at the sealing plate 8. One end of the second sliding groove 13 is provided with a slot for the sealing plate 8 to slide horizontally. Under the action of the second sliding groove 13, the sealing plate 8 is ensured to slide horizontally in the slide cylinder. At the same time, the slot on one side facilitates the slide block 6 to drive the sealing plate 8 to move.

[0033] Example 2: Please refer to Figure 1 and Figure 2 The illustrated infinite-level large-diameter intelligent dart-type fracturing sleeve has an overall structure similar to that of Embodiment 1. It features two sets of shear pin holes 5, both located at the top of the slide cylinder 1. The shear pin holes 5 and the shear pin body 10 are connected by threads. Having only two sets reduces the number of shear pin holes 5 on the outer wall of the slide cylinder 1. If arranged in a continuous ring, it would be equivalent to cutting a continuous groove on the sleeve, directly cutting off the sleeve body, leading to structural fracture and loss of pressure bearing capacity. This arrangement greatly improves the pressure bearing capacity of the slide cylinder 1 itself. Furthermore, the shear pins are used to shear and unlock the slide cylinder under pressure. The shearing force of this localized shear pin arrangement perfectly matches the designed pressure resistance. If arranged in a continuous ring, the shearing force would be infinitely large, making it impossible for the dart-type pressure resistance to cut, causing the slide block to fail directly. This improves the overall service life of the device.

[0034] In practical use, the present invention is as follows: the connector 2 is threadedly connected to the slide cylinder 1, and the overall length is adjusted according to the actual needs of the site. Then, with the help of hoisting equipment, the whole body is inserted into the horizontal wellbore. The workers throw darts into the interior of the slide cylinder 1 in sequence. When the electronic code on the outer wall of the dart matches the code groove in the slide seat 6, the dart will be stuck at the slide seat 6 to form a central seal. At this time, the workers continue to pump fracturing fluid into the slide cylinder 1, so that the internal pressure rises rapidly to 30-50MPa until the slide seat 6 cuts the shear nail body 10 and slides to one side of the slide seat groove 3. Since the sealing plate 8 is slidably set at the fracturing hole 4, the sealing plate 8 and the slide seat 6 are tightly matched to form a physical barrier to the inside of the fracturing hole 4, blocking the particulate impurities in the wellbore to the outside of the fracturing hole 4. As the slide block 6 moves, it drives the sealing plate 8 to slide. At this time, the sealing plate 8 and the slide block 6 will gradually release the blockage of the fracturing hole 4, and guide the particulate impurities in the wellbore, causing them to flow along the outer wall of the slide block 6 to the side away from the sliding gap. This can prevent particulate impurities from entering the sliding gap between the slide block 6 and the slide cylinder 1 during the sliding process, effectively preventing the formation of axial scratches and pits during the movement of the slide block 6. Furthermore, the shear nail body 10 is located at the top of the installation position of the slide cylinder 1. When it is sheared under the pressure of the fracturing fluid, its shear nail body 10 will fall into the shear nail groove 12 on the slide block 6. At the same time, when the slide block 6 pushes the sealing plate 8 to slide to one side, its shield 9 will be inserted into the first slide groove 11 under the action of the slide block groove 3. At this time, the shield 9 just completely shields the top opening of the shear nail groove 12, sealing the broken shear nail body 10 in the closed cavity formed by the shear nail groove 12 and the shield 9, realizing the in-situ collection of shear nail fragments without residue.

[0035] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An infinite-level large-diameter intelligent dart-type fracturing sleeve, comprising a slide cylinder (1), a fracturing hole (4), a slide base (6), and a dart and shear nail body (10), characterized in that: A sealing plate (8) is horizontally slidably disposed on the slide cylinder (1) at the fracturing hole (4). One side of the sealing plate (8) wraps around the end face of the slide block (6). The slide block (6) is used to drive the sealing plate (8) to slide horizontally. A shearing nail hole (5) is opened on the slide cylinder (1) at the slide block (6). A shearing nail groove (12) is opened on the slide block (6) at the shearing nail hole (5). A cover plate (9) is slidably disposed on the slide block (6) at the shearing nail groove (12). The cover plate (9) is used to close the top of the shearing nail groove (12). One end of the cover plate (9) extends through to one side of the sealing plate (8).

2. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The shearing nail hole (5) is provided in two sets, both of which are located on the top of the slide cylinder (1). The shearing nail hole (5) and the shearing nail body (10) are connected by a thread.

3. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The slide (6) has an arc-shaped end face on one side, wherein one end of the sealing plate (8) and the arc-shaped end face of the slide (6) are on the same vertical plane.

4. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The slide cylinder (1) has a second slide groove (13) at the sealing plate (8), wherein one end of the second slide groove (13) is provided with a slot for the sealing plate (8) to slide horizontally.

5. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The depth of the clipper groove (12) is greater than the length of its clipper body (10), and the clipper groove (12) is open.

6. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The sealing plate (8) and the shear nail body (10) are misaligned.

7. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The inner wall of the slide (6) is provided with an encoding groove (7), and the outer wall of the dart is provided with an encoding that cooperates with the encoding groove (7).

8. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 1, characterized in that: The slide block (6) has a first slide groove (11) horizontally arranged at the shearing nail groove (12), wherein the first slide groove (11) is located on the upper part of the side wall of the shearing nail groove (12) and is arranged through, and the first slide groove (11) is used for the cover plate (9) to slide.

9. The infinite-stage large-diameter intelligent dart-type fracturing sleeve according to claim 2, characterized in that: The clipper body (10) and the clipper hole (5) are sealed together.

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