Mechanical counting full-gauge casing fracturing sliding sleeve and counting method thereof

Abstract

This invention provides a mechanically counting full-bore casing fracturing sleeve and its counting method. The mechanically counting full-bore casing fracturing sleeve includes an upper connector, an outer sleeve, a check sleeve, a bypass sleeve, a support claw, a lower connector, a counting ball seat, a support ring, a spring, an inner sleeve, and a pressure-bearing ball seat. This mechanically counting full-bore casing fracturing sleeve can be connected to the completion casing and inserted into the well to the designed well depth. Cementing is performed according to conventional cementing procedures. During staged fracturing, the corresponding sleeves are opened step by step by mechanical counting to complete fracturing. After completion, the full bore is maintained. As an important part of the composite process, it can be used in conjunction with mature bridge plug completion fracturing technology to solve the problems of bridge plug pumping and drilling / well cleaning difficulties in deep wells and long horizontal sections.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas extraction technology, and specifically relates to a mechanical counting type full-bore casing fracturing sliding sleeve. Background Technology

[0002] Horizontal well fracturing is a crucial measure in the development of shale gas and other oil and gas reservoirs. Currently, the main fracturing technology for horizontal wells employs clustered perforation and bridge plug segmented large-scale hydraulic sand fracturing to create a large-scale stimulated volume in the reservoir and increase single-well production. This completion fracturing technology has been successfully applied in shale gas development. However, with the continuous development of shale gas and tight oil and gas, deep wells, long horizontal sections, and upsloping well types pose certain challenges to the conventional bridge plug segmentation process, indicating room for improvement in its application.

[0003] In existing technologies, while pump-driven bridge plug staged fracturing can achieve ultra-large displacement pumping of proppant-carrying fluid and full-bore formation can be achieved after fracturing, the horizontal sections of shale gas wells continue to grow, making it difficult to establish fracturing channels in deep and upturned sections using bridge plugs and perforations. Furthermore, conventional multi-stage fracturing sleeves can only open one sleeve at a time with each ball drop, and the more layers there are, the smaller the ball seat diameter becomes, which also affects flowback due to inner diameter limitations. If the ball seat is not drillable, production logging tools are essentially unable to reach the bottom of the well to log each producing layer; if a drillable ball seat is used, drilling costs are high and there are certain operational risks, especially in drilling long horizontal sections, where it is difficult to achieve full-bore formation of the downhole completion string. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a mechanically counting full-bore casing fracturing sleeve and its counting method. After well completion, it is full-bore and serves as an important part of the composite process. It can be used in conjunction with mature bridge plug completion fracturing technology to solve the problems of difficult bridge plug pumping, drilling / well cleaning in deep wells and long horizontal sections.

[0005] A mechanically counting full-bore casing fracturing sleeve includes an upper connector, an outer sleeve, a check sleeve, a bypass sleeve, a support claw, a lower connector, a counting ball seat, a support ring, a spring, an inner sleeve, and a pressure-bearing ball seat.

[0006] The lower end of the upper connector is connected to the upper end of the outer sleeve, and the lower end of the outer sleeve is connected to the upper end of the lower connector. The upper end of the counting ball seat is in contact with the lower end face of the upper connector. The lower end of the counting ball seat is engaged with the upper end of the inner sliding sleeve. The lower end of the inner sliding sleeve is engaged with the upper end of the bypass sliding sleeve. The lower end of the bypass sliding sleeve is in contact with the upper end face of the support claw. The support claw is embedded in the block-shaped hole of the lower connector. The upper end face of the support ring is in contact with the lower end face of the upper connector. The lower end face of the support ring is in contact with the upper end face of the spring. The lower end face of the spring is in contact with the upper end face of the check sleeve and is fixed inside the outer sleeve. The check sleeve is embedded in the annular space between the outer sleeve and the inner sliding sleeve. The support ring and the spring are integrally engaged between the outer sleeve and the inner sliding sleeve. The upper end of the pressure-bearing ball seat is connected to the bypass sliding sleeve by a pin. The lower end of the pressure-bearing ball seat is in contact with the upper end face of the lower connector.

[0007] Preferably, the upper connector is provided with threads and multiple pin holes for connection and fixation with the outer sleeve;

[0008] The inner wall of the upper connector is provided with a groove for engaging with the counting ball seat.

[0009] Preferably, the outer sleeve is provided with threads and multiple pin holes for connection and fixation with the upper connector and the lower connector;

[0010] The outer sleeve also includes multiple fracturing holes and multiple O-rings, wherein the multiple fracturing holes are located at the lower end of the outer sleeve, and the O-rings cooperate with the fracturing holes.

[0011] Preferably, the inner wall of the outer sleeve is provided with multiple annular grooves to cooperate with the movement of the anti-return sleeve.

[0012] Preferably, the lower connector is provided with multiple pin holes for connection and fixation with the outer sleeve;

[0013] The lower connector has multiple block-shaped holes for embedding support claws.

[0014] Preferably, the counting ball seat is composed of a ring of circumferentially distributed blocks, and the blocks are of the same size and shape;

[0015] The outer wall of the counting ball seat is provided with a smooth inclined surface. The upper half of the inclined surface fits into the upper connector, and the lower half of the inclined surface fits between the upper connector and the inner sliding sleeve.

[0016] Preferably, the anti-return sleeve is provided with two C-shaped rings, which match the outer sleeve and the inner sleeve to ensure the unidirectional counting movement of the anti-return sleeve, and are fitted together between the outer sleeve and the inner sleeve.

[0017] Preferably, the bypass sleeve includes multiple fracturing holes and multiple pin holes, wherein,

[0018] The multiple fracturing holes of the bypass sleeve are used to form fracturing fluid channels with the fracturing holes of the outer sleeve;

[0019] The bypass sleeve and the pressure ball seat are connected and fixed by a pin, and the pin is fitted into the pin hole;

[0020] The upper section of the bypass sleeve is fitted between the outer sleeve and the inner sleeve, the middle section of the bypass sleeve is fitted inside the outer sleeve, and the lower section of the bypass sleeve is fitted between the outer sleeve and the lower connector. The pressure-bearing ball seat is fitted inside the bypass sleeve, and the support claw is fitted inside the outer sleeve.

[0021] A mechanical counting method for counting full-bore casing fracturing sliding sleeves, the method comprising the following steps:

[0022] When the fracturing ball begins to pass through the counting ball seat from the upper joint, the spring is compressed, and the counting ball seat, support ring, inner sliding sleeve, and check sleeve move downwards; after the fracturing ball moves into place, the counting ball seat opens, the fracturing ball passes through completely, the spring returns, and the counting ball seat, support ring, and inner sliding sleeve return to their initial positions, while the check sleeve does not move, thus completing one count.

[0023] New fracturing balls are continuously fed through the counting mechanism. When the count reaches the set number, the spring compresses as the last fracturing ball begins to pass through the counting ball seat. The counting ball seat, support ring, inner sleeve, check sleeve, bypass sleeve, and pressure ball seat move downwards. Simultaneously, the lower end of the pressure ball seat is compressed and narrowed, pressing tightly against the inner wall of the lower connector. The support claw is compressed and extends out of the inner wall of the lower connector. When the last fracturing ball moves into place, the counting ball seat opens, and the fracturing ball completely passes through the counting ball seat. The spring returns to its original position, and the counting ball seat, support ring, and inner sleeve return to their initial positions. The check sleeve, bypass sleeve, pressure ball seat, and support claw do not move, and the full-bore casing fracturing sleeve count is reset.

[0024] Preferably, the method further includes,

[0025] When counting the fracturing sleeve of a mechanically counting full-bore casing, the check sleeve moves down one level for each fracturing ball thrown, and one count is completed.

[0026] Preferably, when the count reaches a set number, the lower end face of the check sleeve contacts the upper end face of the bypass sleeve.

[0027] Preferably, the movement of the fracturing ball into place includes,

[0028] The counting ball seat opens into several petals and enters the upper joint groove. The fracturing ball falls, and the check sleeve enters the next level groove of the outer sleeve.

[0029] Preferably, the fracturing ball being moved into place includes the spring returning to its original position after the fracturing ball has completely passed the counting ball seat.

[0030] Driven by the spring, the counting ball seat, inner sliding sleeve, and support ring move upward in conjunction, while the counting ball seat contracts into a ring shape.

[0031] The counting ball seat, inner sliding sleeve, support ring, and spring are restored to their pre-operation state and position, while the check sleeve remains in the next level groove of the outer sleeve and does not return to its previous position.

[0032] Preferably, the support claw extends out of the inner wall of the lower connector under pressure, including:

[0033] The lower end of the pressure ball seat is squeezed and compressed, and the inner diameter is reduced to the inside of the lower joint and moves downward close to the inner wall of the lower joint.

[0034] The support claws are squeezed by the lower end of the bypass sleeve and extend into the lower connector, forming a circumferential distribution.

[0035] Preferably, after the last fracturing ball is moved into place, the process further includes:

[0036] After being moved into place, the counting ball seat opens into several petals and enters the upper joint groove, and the fracturing ball falls; at the same time, the check sleeve enters the next level groove of the outer sleeve.

[0037] The bypass sleeve fracturing holes and the outer sleeve fracturing holes are aligned one by one to form a fracturing fluid channel.

[0038] Preferably, the full-bore casing fracturing sleeve counter reset includes,

[0039] The counting ball seat, inner sliding sleeve, support ring, and spring are restored to their pre-operation state and position. The check sleeve, bypass sleeve, pressure ball seat, and support claw are not restored to their previous positions. The full-bore casing fracturing sleeve is opened, and a pressure ball seat with an inner diameter smaller than the fracturing ball is generated.

[0040] The technical effects and advantages of this invention are as follows:

[0041] 1. The upper and lower connectors of this invention are connected to the production casing respectively and are inserted into the well along with the casing to complete the cementing operation. No other special tools are required, and it is not limited by well depth or horizontal section length, which reduces the operation risk and saves the completion cost.

[0042] 2. The minimum inner diameter of the wellbore is 100mm, which maintains the full bore diameter and integrity of the wellbore.

[0043] In this embodiment of the invention, a mechanically counting full-bore casing fracturing sleeve can be connected to the completion casing and inserted into the well to the designed well depth. The well is cemented according to the conventional cementing procedure. During staged fracturing, the corresponding sleeve is opened step by step by mechanical counting to complete the fracturing. After completion, the full bore is maintained. As an important part of the composite process, it can be used in conjunction with the mature bridge plug completion fracturing process to solve the problems of bridge plug pumping, drilling / well cleaning difficulties in deep wells and long horizontal sections.

[0044] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of an embodiment of the mechanical counting type full-bore casing fracturing sliding sleeve of the present invention;

[0047] Figure 2 This is a schematic diagram of the structure provided in an embodiment of the present invention where the first fracturing ball has not yet reached the counting ball seat;

[0048] Figure 3 This invention provides a schematic diagram of the structure as the last fracturing ball passes through the counting ball seat;

[0049] Figure 4 This is a schematic diagram of the structure provided by an embodiment of the present invention, showing that the last fracturing ball has completely passed through the counting ball seat and reached the pressure ball seat, and can no longer continue to descend.

[0050] In the diagram, 1 is the upper connector; 2 is the outer sleeve; 3 is the check sleeve; 4 is the bypass sleeve; 5 is the support claw; 6 is the lower connector; 7 is the counting ball seat; 8 is the support ring; 9 is the spring; 10 is the inner sleeve; and 11 is the pressure ball seat. Detailed Implementation

[0051] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0052] To address the shortcomings of existing technologies, this invention discloses a mechanically counting type full-bore casing fracturing sliding sleeve and its counting method, based on... Figure 1As shown, the mechanical counting type full-bore casing fracturing sleeve of the present invention includes an upper connector 1, an outer sleeve 2, a check sleeve 3, a bypass sleeve 4, a support claw 5, a lower connector 6, a counting ball seat 7, a support ring 8, a spring 9, an inner sleeve 10, and a pressure-bearing ball seat 11, wherein,

[0053] The lower end of the upper connector 1 is connected to the upper end of the outer sleeve 2, and the lower end of the outer sleeve 2 is connected to the upper end of the lower connector 6. The upper end of the counting ball seat 7 is in contact with the lower end face of the upper connector 1, and the lower end of the counting ball seat 7 is engaged with the upper end of the inner sliding sleeve 10. The lower end of the inner sliding sleeve 10 is engaged with the upper end of the bypass sliding sleeve 4, and the lower end of the bypass sliding sleeve 4 is in contact with the upper end face of the support claw 5. The support claw 5 is embedded in the block-shaped hole of the lower connector 6, and the upper end face of the support ring 8 is in contact with the lower end face of the upper connector 1. The lower end face of the support ring 8 is in contact with the upper end face of the spring 9, and the lower end face of the spring 9 is in contact with the upper end face of the anti-return sleeve 3 and fixed inside the outer sleeve. The anti-return sleeve 3 is embedded in the annular space between the outer sleeve 2 and the inner sleeve 10. The support ring 8 and the spring 9 are integrally fitted between the outer sleeve 2 and the inner sleeve 10. The upper end of the pressure bearing ball seat 11 is connected to the bypass sleeve 4 by a pin, and the lower end of the pressure bearing ball seat 11 is in contact with the upper end face of the lower connector 6.

[0054] Specifically, the upper connector 1 is threaded and has multiple pin holes for connection and fixation with the outer sleeve 2. The inner wall of the upper connector 1 has a groove for mating with the counting ball seat 7. The outer sleeve 2 is threaded and has multiple pin holes for connection and fixation with the upper connector 1 and the lower connector 6. It has multiple fracturing holes for fracturing fluid to pass through, and an O-ring is provided near the fracturing hole to prevent pressure communication between the inside and outside of the tool. The inner wall has multiple annular grooves for mating with the movement of the check sleeve 3. The lower connector 6 has multiple pin holes for connection and fixation with the outer sleeve 2. The lower connector 6 also has a ring of multiple block-shaped holes for embedding the support claw 5. The counting ball seat 7 is composed of a ring of circumferentially distributed blocks that can open into several equal blocks under force. The outer wall has a smooth inclined surface for movement within the groove of the upper connector 1. The upper half of the counting ball seat 7 fits into the upper connector 1, and the lower half fits between the upper connector 1 and the inner sleeve 10. The support ring 8 and the spring are integrally fitted between the outer sleeve 2 and the inner sleeve 10. The anti-return sleeve 3 is provided with two C-shaped rings for matching the outer sleeve 2 and the inner sleeve 10 to ensure the unidirectional counting movement of the anti-return sleeve 3, which fits together between the outer sleeve 2 and the inner sleeve 10.

[0055] Specifically, the bypass sleeve 4 includes multiple fracturing holes and multiple pin holes, wherein,

[0056] The bypass sleeve 4 is provided with multiple fracturing holes, which together with the fracturing holes of the outer sleeve 2 form a fracturing fluid channel after the movement is in place; the bypass sleeve 4 is provided with multiple pin holes for connection and fixation with the pressure ball seat 11, and the bypass sleeve 4 and the pressure ball seat 11 are connected and fixed by pins, and the pins are fitted into the pin holes.

[0057] The upper section of the bypass sleeve 4 fits between the outer sleeve 2 and the inner sleeve 10, the middle section fits inside the outer sleeve 2, and the lower section fits between the outer sleeve 2 and the lower connector 6. The pressure-bearing ball seat 11 fits inside the bypass sleeve 4 and is made of deformable metal. The support claw 5 fits inside the outer sleeve 2.

[0058] A mechanical counting method for counting full-bore casing fracturing sliding sleeves, the method comprising the following steps:

[0059] When the fracturing ball begins to pass through the counting ball seat 7 from the upper connector 1, the spring 9 is compressed, and the counting ball seat 7, support ring 8, inner sliding sleeve 10, and check sleeve 3 move downwards; after the fracturing ball moves into place, the counting ball seat 7 opens, the fracturing ball passes through completely, the spring 9 returns to its original position, the counting ball seat 7, support ring 8, and inner sliding sleeve 10 return to their initial positions, and the check sleeve 3 does not move, thus completing one count;

[0060] New fracturing balls are continuously fed through the counting mechanism. When the count reaches the set number, and the last fracturing ball begins to pass through the counting ball seat 7, the spring 9 is compressed. The counting ball seat 7, support ring 8, inner sleeve 10, check sleeve 3, bypass sleeve 4, and pressure ball seat 11 move downwards. At the same time, the lower end of the pressure ball seat 11 is compressed and narrowed, pressing tightly against the inner wall of the lower connector 6. The support claw 5 is pressed and extends out of the inner wall of the lower connector 6. When the last fracturing ball moves into place, the counting ball seat 7 opens, and the fracturing ball completely passes through the counting ball seat 7. The spring 9 returns to its original position, and the counting ball seat 7, support ring 8, and inner sleeve 10 return to their initial positions. The check sleeve 3, bypass sleeve 4, pressure ball seat 11, and support claw 5 do not move, and the full-bore casing fracturing sleeve count is reset.

[0061] Specifically, in combination Figures 2-4 As shown in the mechanical counting process of full-bore casing fracturing sliding sleeve, it can be seen that, combined with Figure 2 As shown in the schematic diagram of the structure provided in this embodiment of the invention before the first fracturing ball reaches the counting ball seat, when the fracturing ball begins to pass through the counting ball seat 7, the spring 9 is compressed, and the counting ball seat 7, support ring 8, inner sliding sleeve 10, and check sleeve 3 move downwards; after moving one stroke, the counting ball seat 7 opens, the fracturing ball passes completely, the spring 9 returns to its original position, the counting ball seat 7, support ring 8, and inner sliding sleeve 10 return to their initial positions, and the check sleeve 3 does not move, completing one count; new fracturing balls are continuously fed to repeat the counting process until a set number is reached, combined with... Figure 3As shown in the structural diagram of the last fracturing ball passing through the counting ball seat in this embodiment of the invention, when the last fracturing ball begins to pass through the counting ball seat 7, the spring 9 is compressed, and the counting ball seat 7, support ring 8, inner sliding sleeve 10, check sleeve 3, bypass sleeve 4, and pressure-bearing ball seat 11 move downwards. At the same time, the lower end of the pressure-bearing ball seat 11 is compressed and its diameter is reduced, tightly adhering to the inner wall of the lower connector 6, and the support claw 5 is pressed out of the inner wall of the lower connector 6; after moving one stroke, combined with Figure 4 As shown in the schematic diagram of the present invention embodiment, the last fracturing ball completely passes through the counting ball seat and reaches the pressure ball seat and cannot continue to descend. It can be seen that the counting ball seat 7 opens, the fracturing ball passes through completely, the spring 9 returns to its original position, the counting ball seat 7, the support ring 8, and the inner sliding sleeve 10 return to their initial positions, the check sleeve 3, the bypass sleeve 4, the pressure ball seat 11, and the support claw 5 do not move, and the full-bore casing fracturing sliding sleeve is activated.

[0062] Specifically, during operation, the corresponding designed number of fracturing balls are deployed to open the mechanically counting full-bore casing fracturing sleeve. The counting ball seat 7, pushed by the fracturing balls, moves downwards in conjunction with the inner sleeve 10, support ring 8, and check sleeve 3. Simultaneously, the upper end of the spring 9 is compressed downwards, while the lower end remains fixed. After moving into position, the counting ball seat 7 opens into several segments and enters the groove of the upper connector 1. The fracturing balls fall due to the opening of the counting ball seat 7; at the same time, the check sleeve 3 enters the next level groove of the outer sleeve 2. After the fracturing balls have completely passed through the counting ball seat 7, the counting ball seat 7, inner sleeve 10, and support ring 8 move upwards in conjunction with the push of the spring 9, while the counting ball seat 7 contracts into a ring shape. At this point, the counting ball seat 7, inner sleeve 10, support ring 8, and spring 9 return to their pre-operational state and position, except for the check sleeve 3, which remains in the next level groove of the outer sleeve 2 and does not return to its previous position, completing one count. The fracturing balls then move downwards away from the tool. This process continues, with each fracturing ball being thrown. The check sleeve moves downwards one level after each ball is thrown, completing one count, while other components return to their pre-operational state and position. When the designed number of balls is reached, the lower end of the check sleeve 3 contacts the upper end of the bypass sleeve 4. The counting ball seat 7 is pushed by the fracturing balls, causing the counting ball seat 7, inner sleeve 10, support ring 8, check sleeve 3, and bypass sleeve 4 to move downwards in tandem. Simultaneously, the upper end of the spring 9 is compressed downwards, while the lower end remains fixed. At the same time, the lower end of the pressure ball seat 11 is compressed, reducing the inner diameter to within the lower connector and moving downwards close to the inner wall of the lower connector 6. Simultaneously, the support claw 5 is squeezed by the lower end of the bypass sleeve 4, extending into the lower connector 6 and forming a circumferential distribution. After being moved into position, the counting ball seat 7 opens into several segments and enters the groove of the upper connector 1. The fracturing ball falls due to the opening of the counting ball seat 7. At the same time, the check sleeve 3 enters the next level groove of the outer sleeve 2. Simultaneously, the fracturing holes of the bypass sleeve 4 and the outer sleeve 2 are aligned one by one, forming a fracturing fluid channel. After the fracturing ball has completely passed through the counting ball seat 7, under the push of the spring 9, the counting ball seat 7, the inner sleeve 10, and the support ring 8 move upward in linkage, while the counting ball seat 7 contracts into a ring shape. At this time, the counting ball seat 7, the inner sleeve 10, the support ring 8, and the spring 9 return to their pre-operation state and position, while the check sleeve 3, the bypass sleeve 4, the pressure-bearing ball seat 11, and the support claw 5 do not return to their previous positions. This completes the opening of the mechanical counting full-bore casing fracturing sleeve and generates a ball seat with an inner diameter smaller than the fracturing ball. After the fracturing ball moves to the position of the pressure ball seat 11, it cannot pass through. The downward channel of fracturing fluid inside the tool is blocked by the fracturing ball and the pressure ball seat 11. It can only flow out through the fracturing fluid channel formed by the bypass sleeve 4 and the outer sleeve 2, thus realizing the design function.

[0063] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0064] Those skilled in the art will understand that the components in the apparatus of the embodiments may be distributed in the apparatus of the embodiments as described in the embodiments, or may be located in one or more devices different from this embodiment with corresponding changes. The components of the above embodiments may be combined into one component, or may be further divided into multiple sub-components.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A mechanically-counted full-gauge sleeve frac slide, characterized in that, The mechanical counting full-bore casing fracturing sleeve includes an upper connector (1), an outer sleeve (2), a check sleeve (3), a bypass sleeve (4), a support claw (5), a lower connector (6), a counting ball seat (7), a support ring (8), a spring (9), an inner sleeve (10), and a pressure-bearing ball seat (11), wherein, The lower end of the upper connector (1) is connected to the upper end of the outer sleeve (2), the lower end of the outer sleeve (2) is connected to the upper end of the lower connector (6), the upper end of the counting ball seat (7) is in contact with the lower end face of the upper connector (1), the lower end of the counting ball seat (7) is engaged with the upper end of the inner sliding sleeve (10), the lower end of the inner sliding sleeve (10) is engaged with the upper end of the bypass sliding sleeve (4), the lower end of the bypass sliding sleeve (4) is in contact with the upper end face of the support claw (5), and the support claw (5) is embedded in the block-shaped hole of the lower connector (6). The upper end face of the support ring (8) is in contact with the lower end face of the upper connector (1), the lower end face of the support ring (8) is in contact with the upper end face of the spring (9), the lower end face of the spring (9) is in contact with the upper end face of the check sleeve (3) and is fixed inside the outer sleeve, the check sleeve (3) is embedded in the annular space between the outer sleeve (2) and the inner sleeve (10), the support ring (8) and the spring (9) are integrally fitted between the outer sleeve (2) and the inner sleeve (10), the upper end of the pressure bearing ball seat (11) is connected to the bypass sleeve (4) by a pin, and the lower end of the pressure bearing ball seat (11) is in contact with the upper end face of the lower connector (6); The upper connector (1) is connected and fixed to the outer sleeve (2) by threads and multiple pin holes; the inner wall of the upper connector (1) is provided with a groove for cooperating with the counting ball seat (7); The inner wall of the outer sleeve (2) is provided with multiple annular grooves for cooperating with the movement of the anti-return sleeve (3); The anti-return sleeve (3) is provided with two C-shaped rings, which are matched with the outer sleeve (2) and the inner sleeve (10) to ensure the unidirectional counting motion of the anti-return sleeve (3), and are fitted together between the outer sleeve (2) and the inner sleeve (10). The upper section of the bypass sleeve (4) is fitted between the outer sleeve (2) and the inner sleeve (10), the middle section of the bypass sleeve (4) is fitted inside the outer sleeve (2), and the lower section of the bypass sleeve (4) is fitted between the outer sleeve (2) and the lower connector (6). The pressure bearing ball seat (11) is fitted inside the bypass sleeve (4), and the support claw (5) is fitted inside the outer sleeve (2).

2. The mechanical counting type full-bore casing fracturing sliding sleeve according to claim 1, characterized in that, The outer sleeve (2) is provided with threads and multiple pin holes for connection and fixation with the upper connector (1) and the lower connector (6); The outer sleeve (2) also includes multiple fracturing holes and multiple O-rings, wherein the multiple fracturing holes are located at the lower end of the outer sleeve (2), and the O-rings cooperate with the fracturing holes.

3. The mechanical counting type full-bore casing fracturing sliding sleeve according to claim 1, characterized in that, The lower connector (6) is provided with multiple pin holes for connecting and fixing with the outer sleeve (2); The lower connector (6) is provided with multiple block-shaped holes for embedding support claws (5).

4. The mechanical counting type full-bore casing fracturing sliding sleeve according to claim 1, characterized in that, The counting ball seat (7) is composed of a ring of circumferentially distributed blocks, which are of the same size and shape; The outer wall of the counting ball seat (7) is provided with a smooth inclined surface. The upper half of the inclined surface is fitted into the upper connector (1), and the lower half of the inclined surface is fitted between the upper connector (1) and the inner sliding sleeve (10).

5. The mechanical count full gauge sleeve frac sleeve of claim 1, wherein, The bypass sleeve (4) includes multiple fracturing holes and multiple pin holes, wherein, The multiple fracturing holes of the bypass sleeve (4) are used to form fracturing fluid channels with the fracturing holes of the outer sleeve (2); The bypass sleeve (4) and the pressure ball seat (11) are connected and fixed by a pin, and the pin is fitted into the pin hole.

6. A method of counting a mechanically-counted full-gauge sleeve frac sleeve, the method comprising: The method includes the following steps: When the fracturing ball begins to pass through the counting ball seat (7) from the upper connector (1), the spring (9) is compressed, and the counting ball seat (7), support ring (8), inner sliding sleeve (10), and check sleeve (3) move downwards; after the fracturing ball moves into place, the counting ball seat (7) opens, the fracturing ball passes through completely, the spring (9) recovers, and the counting ball seat (7), support ring (8), and inner sliding sleeve (10) return to their initial positions, while the check sleeve (3) does not move, thus completing one count; Continue to feed new fracturing balls and repeat the counting process. When the count reaches the set number, the spring (9) is compressed when the last fracturing ball begins to pass through the counting ball seat (7). The counting ball seat (7), support ring (8), inner sliding sleeve (10), check sleeve (3), bypass sleeve (4), and pressure ball seat (11) move downward. At the same time, the lower end of the pressure ball seat (11) is compressed and shrinks in diameter, closely adhering to the inner wall of the lower connector (6). The support claw (5) is pressed and extends out of the inner wall of the lower connector (6). When the last fracturing ball moves into place, the counting ball seat (7) opens, the fracturing ball passes completely through the counting ball seat (7), the spring (9) recovers, and the counting ball seat (7), support ring (8), and inner sliding sleeve (10) return to their initial positions. The check sleeve (3), bypass sleeve (4), pressure ball seat (11), and support claw (5) do not move, and the full-bore casing fracturing sleeve count is reset. The fracturing ball is moved into place as follows: the counting ball seat (7) opens into several petals and enters the groove of the upper connector (1); the fracturing ball falls and the check sleeve (3) enters the next level groove of the outer sleeve (2); After the last fracturing ball is moved into place, the process also includes: After being moved into place, the counting ball seat (7) opens into several petals and enters the groove of the upper connector (1), and the fracturing ball falls down; at the same time, the check sleeve (3) enters the next level groove of the outer sleeve (2); The fracturing holes of the bypass sleeve (4) and the fracturing holes of the outer sleeve (2) are aligned one by one to form a fracturing fluid channel.

7. The counting method of claim 6, wherein, The method also includes, When counting the fracturing sleeve of a mechanically counting full-bore casing, each time a fracturing ball is thrown, the check sleeve (3) moves down one level and completes one count.

8. The counting method according to claim 6 or 7, characterized in that, When the count reaches the set number, the lower end face of the check sleeve (3) contacts the upper end face of the bypass sleeve (4).

9. The counting method of claim 6, wherein, The fracturing ball moving into place includes the following: after the fracturing ball has completely passed through the counting ball seat (7), the spring (9) returns to its original position. Under the push of the spring (9), the counting ball seat (7), the inner sliding sleeve (10), and the support ring (8) move upward in linkage, while the counting ball seat (7) contracts into a ring shape. The counting ball seat (7), the inner sliding sleeve (10), the support ring (8), and the spring (9) return to their pre-operation state and position, and the check sleeve (3) remains in the next level groove of the outer sleeve (2) and does not return to its previous position.

10. The counting method of claim 6, wherein, The support claw (5) extends out of the inner wall of the lower connector (6) under pressure, including, The lower end of the pressure ball seat (11) is squeezed and compressed, and the inner diameter is reduced to the inside of the lower connector (6) and moves downward close to the inner wall of the lower connector (6); The support claw (5) is squeezed by the lower end of the bypass sleeve (4) and extends into the interior of the lower connector (6), forming a circumferential distribution.

11. The counting method of claim 6, wherein, The full-bore casing fracturing sliding sleeve counter reset includes, The counting ball seat (7), inner sliding sleeve (10), support ring (8), and spring (9) are restored to their pre-operation state and position. The check sleeve (3), bypass sleeve (4), pressure ball seat (11), and support claw (5) are not restored to their previous positions. The full-bore casing fracturing sliding sleeve is opened and a pressure ball seat (11) with an inner diameter smaller than the fracturing ball is generated.

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