CN110593839A - A countable downhole full-bore fracturing sliding sleeve - Google Patents

Abstract

The invention discloses a countable underground full-drift-diameter fracturing sliding sleeve which is internally provided with a counting mechanism, wherein the counting mechanism generates a fixed displacement amount when passing through a boss of an execution assembly, and the counting mechanism is preset with a total displacement amount on the ground according to the number of the bosses which pass through the execution assembly before a switch assembly reaches a target fracturing layer; trigger latch mechanism and packing mechanism behind the preceding boss on purpose fracturing layer when the switch assembly, treat that the total displacement volume that finishes of counting mechanism execution, latch mechanism and packing mechanism execution finish, the switch assembly also enters into purpose fracturing layer to further open the fracturing passageway of the execution assembly on purpose fracturing layer, so the fracturing sliding sleeve of this application only need be equipped with one set of on-off mechanism can, solved current fracturing sliding sleeve and need be equipped with the problem of a plurality of specification on-off mechanisms.

Description

A countable downhole full-bore fracturing sliding sleeve

technical field

The invention relates to a downhole layered fracturing tool, in particular to a downhole layered fracturing sliding sleeve.

Background technique

A downhole split-layer fracturing tool is a component used to communicate the reservoir and well layers. Downhole full-bore infinite-stage fracturing sliding sleeve CN 107178352 B realizes full-bore fracturing, but has obvious deficiencies, mainly in the following aspects:

(1) Two layers of annular bosses need to be set for each set of sliding sleeve actuators, and the distance between the two layers of annular bosses in each sliding sleeve actuator is not equal, and the distance between the two layers of pistons on the corresponding switch mechanism is not equal. The switch mechanism can seal and open the fracturing channel only when the piston on the switch mechanism completely corresponds to the two-layer annular boss on the actuator.

Assuming that fracturing 5 formations requires 5 types of actuators, each of which has a completely different annular boss spacing. The fracturing channel can only be opened when the piston spacing of the switching mechanism is the same as the annular boss spacing of the corresponding actuator. Therefore, it is necessary to 5 types of piston spacing switch mechanism.

For example: the actuator ① corresponds to the switch mechanism ①, and can open the fracturing channel, the actuator ② corresponds to the switch mechanism ②, and can open the fracturing channel, and the actuator ① corresponds to the switch mechanism ② cannot open the fracturing channel, and the fracturing is performed on site The number of layers is large, and there are many types of actuators and switch mechanisms required, which increases the difficulty of construction and manufacturing costs.

(2) When fracturing the formation, it is necessary to accurately run the corresponding switch mechanism according to the distance between the bosses of the sliding sleeve into the formation, so as to realize the opening of the sliding sleeve. During the fracturing operation, the number of fracturing layers is large, and the downhole force is complex. It is difficult to ensure that the switch mechanism corresponds exactly to the sliding sleeve actuator.

Due to the above reasons, the application of full-bore infinite pole fracturing sliding sleeves in fracturing operations is limited.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a countable downhole full-bore fracturing sliding sleeve, which solves the problem that the existing fracturing sliding sleeve needs to be equipped with multiple specifications of switch mechanisms.

In order to achieve the above purpose of the invention, the described countable downhole full-bore fracturing sliding sleeve includes a switch assembly and at least one execution assembly, the execution assembly is connected to the wellbore, and the execution assembly has a The boss; the switch assembly is put into the wellbore, and is characterized in that:

The switch assembly includes a counting mechanism, a sealing mechanism and a locking mechanism;

When the switch assembly descends through the boss in the wellbore, the boss contacts the counting mechanism to form a driving force;

the driving force is used to trigger the operation of the counting mechanism and generate a fixed displacement;

The fixed displacement is used to calculate the total displacement;

The total displacement is equal to the fixed displacement × (the number of layers of the target fracturing layer-1);

Presetting the total displacement into the counting mechanism;

When the counting mechanism completes the execution of the total displacement, the counting mechanism activates the packing mechanism and the locking mechanism, and the switch assembly descends to the target fracturing layer;

The packing mechanism is used for setting the formation during the fracturing operation so that the fracturing fluid forms a driving hydraulic force in the wellbore;

The locking mechanism is used for the switch assembly to sit on the boss when it reaches the target fracturing layer, and transmit the driving hydraulic force to the target fracturing layer through the boss on the corresponding execution assembly;

The driving hydraulic force is used to drive the execution assembly to open the fracturing channel of the target fracturing layer.

Preferably, the switch assembly includes: a switch body;

The switch body includes: a top cover, a middle cover and a lower cover;

the top cover is connected with the middle sleeve;

An annular boss is arranged in the middle sleeve;

the annular boss for supporting the counting mechanism;

Two tracks are symmetrically arranged on the inner wall of the middle sleeve below the annular boss;

the lower sleeve is connected to the lower end of the middle sleeve;

The locking mechanism connection structure is arranged on the lower sleeve.

Preferably, the counting mechanism includes a linear displacement mechanism and a driving mechanism;

the drive mechanism is connected to the top cover;

During the downward process of the switch assembly in the wellbore, the driving mechanism is in contact with the boss to generate the driving force;

The driving force is used to drive the linear displacement mechanism to generate the fixed displacement amount.

Preferably, the linear displacement mechanism includes a ratchet shaft and a ratchet sleeve;

the ratchet shaft is rotatably connected to the annular boss;

Two through-length rectangular grooves are symmetrically arranged on the outer circumference of the ratchet sleeve;

The track is connected with the rectangular groove as a linear sliding guide rail mechanism;

the sliding guide rail mechanism is used for the displacement guidance of the ratchet sleeve and restricting the axial rotation of the ratchet sleeve;

The ratchet sleeve is coaxially threaded with the ratchet shaft;

The driving force drives the ratchet shaft to rotate by a fixed angle, and at the same time, the ratchet sleeve moves along the sliding rail mechanism by the fixed displacement amount.

Preferably, the driving mechanism includes: a push block, a ratchet pawl and a start counting assembly;

the push block shaft is connected to the top cover;

Ratchet teeth are arranged on the ratchet shaft;

the ratchet pawl is connected with the push block;

the ratchet pawl and the ratchet teeth constitute a ratchet mechanism;

The start counting assembly is attached to the outer side of the push block;

When the switch assembly passes the boss, the boss presses the activation counting assembly;

the extrusion is used to form the driving force;

the driving force is used to drive the push block to drive the ratchet pawl to rotate;

The ratchet pawl rotates to push the ratchet teeth to drive the ratchet shaft to rotate by a fixed angle.

Preferably, the lower part of the start counting assembly is an arc surface thin plate, and the upper part is an inclined flat plate;

A fixing hole is opened on the circular arc panel sheet;

the fixing hole is used for connecting with the switch main body;

The distance between the two symmetrically arranged inclined plates is greater than the inner diameter of the boss;

The inclined flat plate is attached to the outer side of the push block;

The boss presses the inclined plate to form the driving force.

Preferably, the counting mechanism further comprises: a safety claw assembly;

The safety claw assembly includes: a safety claw and a first return spring;

The upper part of the ratchet shaft has gear teeth;

The front end of the safety claw is a gear tooth structure, and the middle shaft is connected to the top cover;

the gear tooth structure meshes with the gear teeth;

the first return spring is used to tighten the gear tooth structure on the gear teeth;

One of the inclined flat plates is attached to the side of the safety claw for squeezing the safety claw;

The safety claw rotates with the shaft as the center against the tightening force under the pressing action;

The safety claw performs the rotation for the gear tooth structure to be separated from the gear teeth;

The separation is used for the free rotation of the ratchet shaft.

Preferably, the isolation mechanism includes: a slider assembly and a rubber cylinder;

The rubber tube is sleeved outside the middle sleeve;

the slider assembly is connected to the middle sleeve;

There is a first flow channel in the middle sleeve;

The slider assembly has a second flow channel;

When the counting mechanism activates the packing mechanism, the slider assembly is used to push the rubber cartridge to form a gap with the middle sleeve, and connect the first flow channel to the second sleeve. The two flow channels are connected to form a total flow channel;

The fracturing hydraulic force enters the gap through the main flow channel;

The fracturing hydraulic force is used to expand the gap and expand the rubber cylinder.

Preferably, the latching mechanism includes: a pop-up assembly, a start-up assembly and a locking assembly;

When the switch assembly passes through the previous layer of the target fracturing layer, the ejection assembly is ejected radially, and the switch assembly stops on the boss when it reaches the target fracturing layer;

the counting mechanism activates the activation assembly;

the start-up assembly for triggering the radial ejection of the ejection assembly;

The locking assembly is used for locking the ejected assembly when the ejecting assembly is seated on the boss.

Preferably, the ejection assembly includes: a card plate and a card plate spring;

the card board is symmetrically mounted on the lower sleeve;

The bottom end of the card plate is provided with a triangular hook structure and a non-return pin hole;

The starting assembly includes: a push rod and a push rod spring;

the push rod has a triangular groove;

The triangular hook structure and the triangular groove are fastened together to prevent the card plate from popping out radially;

A clamping plate spring is connected between the push rod and the clamping plate;

The counting mechanism presses down the push rod spring, and when the triangular hook structure of the push rod is disengaged from the triangular groove, the card plate spring is used to apply a radial ejection force to the card plate;

The locking assembly includes: a check pin and a check spring;

When the card plate is ejected radially and stops on the boss, the non-return spring pushes the non-return pin into the non-return pin hole;

The non-return pin is used for locking the ejection assembly on the boss.

The present invention has the following beneficial effects:

The countable downhole full-bore fracturing sliding sleeve of the present invention has a counting mechanism inside, and the counting mechanism generates a fixed displacement each time it passes through a boss of an execution assembly, so that the counting mechanism can pass through a boss of an execution assembly. The purpose of one count; continue to preset the total displacement of the counting mechanism on the ground according to the number of bosses that must pass through the execution assembly before the switch assembly reaches the target fracturing layer; during work, when the switch assembly passes through the target The locking mechanism and the isolation mechanism are triggered after the previous boss of the fracturing layer. After the counting mechanism completes the execution of the total displacement, the locking mechanism and the isolation mechanism are triggered, and the switch assembly also enters the target fracturing layer and is further turned on. It is the fracturing channel of the execution assembly of the target fracturing layer, so the fracturing sliding sleeve of the present application only needs to be equipped with a set of switch mechanisms.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

1 is a schematic structural diagram of a countable downhole full-bore fracturing sliding sleeve according to an embodiment of the present invention;

2 is a schematic structural diagram of an executive mechanism according to an embodiment of the present invention;

3 is a schematic three-dimensional structure diagram of an upper joint according to an embodiment of the present invention;

Fig. 4 is the sectional view of the upper joint of the embodiment of the present invention;

5 is a schematic three-dimensional structure diagram of a lower joint according to an embodiment of the present invention;

Fig. 6 is the sectional view of the lower joint of the embodiment of the present invention;

7 is a schematic three-dimensional structure diagram of an inner sliding sleeve according to an embodiment of the present invention;

Fig. 8 is the sectional view of the inner sliding sleeve of the embodiment of the present invention;

9-A is a cross-sectional view of a switch mechanism according to an embodiment of the present invention;

9-B is a schematic three-dimensional structural diagram of a switch mechanism according to an embodiment of the present invention;

9-C is a schematic three-dimensional structure diagram of a counting mechanism according to an embodiment of the present invention;

9-D is a top view of the counting mechanism according to the embodiment of the present invention;

9-E is a structural cross-sectional view of a packing mechanism according to an embodiment of the present invention;

9-F is a schematic three-dimensional structure diagram of a locking mechanism according to an embodiment of the present invention;

10 is a cross-sectional view taken along line A-A in FIG. 9-A of an embodiment of the present invention;

11 is a sectional view taken along the line B-B in FIG. 9-A of an embodiment of the present invention;

FIG. 12 is a schematic three-dimensional structure diagram of a top cover according to an embodiment of the present invention;

13 is a cross-sectional view of a top cover of an embodiment of the present invention;

14 is a schematic three-dimensional structure diagram of a middle sleeve according to an embodiment of the present invention;

15 is a cross-sectional view of a middle sleeve according to an embodiment of the present invention;

FIG. 16 is a three-dimensional structural view of a sliding plate according to an embodiment of the present invention;

17 is a schematic three-dimensional structure diagram of a ratchet shaft assembly according to an embodiment of the present invention;

18 is a schematic three-dimensional structure diagram of a ratchet shaft according to an embodiment of the present invention;

19 is a cross-sectional view of a ratchet shaft according to an embodiment of the present invention;

Figure 20 is a schematic three-dimensional structure diagram of a ratchet sleeve according to an embodiment of the present invention;

21 is a cross-sectional view of a ratchet sleeve according to an embodiment of the present invention;

22 is a schematic three-dimensional structural diagram of a safety claw assembly according to an embodiment of the present invention;

Fig. 23 is the bottom view of the safety claw of the embodiment of the present invention;

Figure 24 is a schematic three-dimensional structure diagram of the first return spring and the second return spring according to the embodiment of the present invention;

25 is a schematic three-dimensional structure diagram of a ratchet pawl assembly according to an embodiment of the present invention;

FIG. 26 is a schematic three-dimensional structure diagram of a push block according to an embodiment of the present invention;

27 is a schematic three-dimensional structure diagram of a ratchet pawl according to an embodiment of the present invention;

FIG. 28 is a schematic three-dimensional structure diagram of an elastic sheet according to an embodiment of the present invention;

FIG. 29 is a schematic three-dimensional structure diagram of a rubber cartridge according to an embodiment of the present invention;

FIG. 30 is a schematic three-dimensional structure diagram of a fixing sleeve on a rubber cartridge according to an embodiment of the present invention;

31 is a cross-sectional view of the fixing sleeve on the rubber cylinder according to the embodiment of the present invention;

32 is a cross-sectional view of the lower fixing sleeve of the rubber cartridge according to the embodiment of the present invention;

33 is a schematic three-dimensional structural diagram of a slider assembly according to an embodiment of the present invention;

34 is a schematic three-dimensional structure diagram of a slider pin according to an embodiment of the present invention;

35 is a cross-sectional view of a slider pin of an embodiment of the present invention;

36 is a schematic three-dimensional structure diagram of a slider according to an embodiment of the present invention;

Figure 37 is a cross-sectional view of the slider of the embodiment of the present invention;

Figure 38 is a schematic three-dimensional structure diagram of a lower sleeve according to an embodiment of the present invention;

Figure 39 is a cross-sectional view of a lower sleeve of an embodiment of the present invention;

Figure 39-A is a bottom view of the lower sleeve of the embodiment of the present invention;

40 is a schematic three-dimensional structure diagram of a card board according to an embodiment of the present invention;

Figure 41 is a schematic three-dimensional structure diagram of a non-return pin according to an embodiment of the present invention;

Figure 42 is a schematic three-dimensional structure diagram of a push rod according to an embodiment of the present invention;

Figure 43 is a schematic three-dimensional structure diagram of a cone tip according to an embodiment of the present invention;

Figure 44 is a schematic diagram of the initial position of the locking mechanism and the packing mechanism according to the embodiment of the present invention;

Fig. 44-A is a partially enlarged schematic diagram of the initial state of the packing mechanism according to the embodiment of the present invention;

44-B is a partially enlarged schematic diagram of the initial state of the latching mechanism according to the embodiment of the present invention;

Figure 44-C is a schematic diagram of the positional relationship between the ratchet sleeve, the push rod and the slider after the switch mechanism according to the embodiment of the present invention passes through the third actuator;

Fig. 45 is a schematic diagram of the working state of the packing mechanism and the locking mechanism after being triggered according to the embodiment of the present invention.

Detailed ways

The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are described in detail. However, those skilled in the art can fully understand the present invention for the parts that are not described in detail.

Furthermore, it should be understood by those of ordinary skill in the art that the accompanying drawings are provided only to illustrate the objects, features and advantages of the present invention and are not actually drawn to scale.

Meanwhile, unless the context clearly requires otherwise, throughout the specification and claims, words such as "including", "comprising" and the like should be construed in an inclusive rather than an exclusive or exhaustive sense; that is, "including but not limited to" means.

FIG. 1 is a schematic structural diagram of a countable downhole full-bore fracturing sliding sleeve according to an embodiment of the present invention. As shown in Figure 1, each set of countable downhole full-bore fracturing sliding sleeves includes execution assembly 1 and switch assembly 2. Each set of execution assembly 1 corresponds to a formation to be fracturing. During fracturing, the execution assembly 1 is opened to form a channel between the fracturing fluid and the formation, so that the fracturing fluid can directly fract the formation.

In FIG. 2 , the execution assembly 1 includes an upper joint 3 , a lower joint 4 and an inner sliding sleeve 5 .

In Figures 3 and 4, the upper joint 3 is cylindrical, and its main function is to form the connection between the actuator and the casing, the upper end of the upper joint 3 is threadedly connected to the casing, and the lower end is provided with threads;

In Figures 5 and 6, the lower joint 4 adopts a cylindrical structure, and its upper end is threadedly connected to the lower part of the upper joint 3; two outer fracturing holes 4-1 are symmetrically arranged on the cylinder wall of the lower joint 4; A shear pin hole 4-2 is arranged below the hole 4-1; a stop boss 4-3 is arranged inside the lower joint 4;

In FIGS. 7 and 8 , the inner sliding sleeve 5 is provided with a boss 5-3 at the bottom, and two inner fracturing holes 5-1 are symmetrically arranged in the middle of the inner sliding sleeve 5. When the inner fracturing hole 5-1 is aligned with the two outer fracturing holes 4-1 on the lower joint, a fracturing channel is formed, and the fracturing channel is used for fracturing; the lower part of the inner sliding sleeve 5 is provided with a shear pin hole 5-2.

In the initial state, as shown in Figure 1, the inner sliding sleeve 5 is installed concentrically with the lower joint 4, the inner sliding sleeve 5 is inside the lower joint 4, the upper end surface of the inner sliding sleeve 5 is flush with the upper end surface of the lower joint 4, and the inner sliding sleeve 5 is flush with the upper end surface of the lower joint 4. The shear pin hole 5-2 of 5 is aligned with the shear pin hole 4-2 of the lower joint, and a shear pin 17 is built in, and the shear pin 17 fixedly connects the inner sliding sleeve 5 and the lower joint 4 together.

After the inner sliding sleeve 5 is fixedly connected with the lower joint 4, the inner fracturing hole 5-1 is above the outer fracturing hole 4-1 on the lower joint 4, and the inner fracturing hole 5-1 and the outer fracturing hole 4-1 are located. The distance between them is equal to the distance from the lower end surface of the inner sliding sleeve 5 to the stop boss 4-3 provided inside the lower joint 4 .

During the fracturing operation, an external force is applied to the inner boss 5-3 of the inner sliding sleeve 5. When the external force is large enough to cut off the shear pin 17, the inner sliding sleeve 5 moves downward, and the lower end surface of the inner sliding sleeve 5 contacts the bottom. When the stop boss 4-3 is arranged inside the joint 4, the inner sliding sleeve 5 stops moving. At this time, the outer fracturing hole 4-1 is aligned with the inner fracturing hole 5-1, and the fracturing channel is opened.

In FIG. 1 , when in use, the switch assembly 2 is put into the inner sliding sleeve 5 .

The function of switch assembly 2 is:

①Before fracturing, just pass through without opening all the execution assemblies 1 before the target fracturing layer, and form a seal with the inner sliding sleeve 5 when reaching the target fracturing layer to prevent the fracturing fluid from flowing out of the target fracturing layer. Ensure that the fracturing fluid forms a high-pressure driving hydraulic force in the target fracturing layer;

② During fracturing, the driving hydraulic force acts on the boss 5-3 inside the inner sliding sleeve 5 of the target fracturing layer through the switch assembly 2, so that the inner sliding sleeve 5 moves down to open the fracturing channel.

The switch assembly 2 includes a switch body, a counting mechanism, a sealing mechanism and a locking mechanism.

In Fig. 9-A and Fig. 9-B, the main body of the switch is used as the mounting frame of the counting mechanism, the packing mechanism and the locking mechanism. Including: top cover 6, middle sleeve 20, lower sleeve 14, cone tip 18.

In FIGS. 12 and 13 , the top cover 6 has a cylindrical structure, and a circular hole 6-2 is provided in the center of the upper end face of the top cover, and the liquid in the wellbore flows into the top cover 6 from the circular hole 6-2. The left side of the upper end face of the top cover is provided with a safety claw fixing hole 6-1, the right side is provided with a push block fixing hole 6-3, two rectangular holes 6-5 are symmetrically arranged on the circumference of the top cover cylinder, and the two rectangular holes 6- 5. The lower end surface is provided with a boss 6-6, the safety claw fixing hole 6-1 and the push block fixing hole 6-3 pass through the boss 6-6; the boss 6-6 is provided with a return spring fixing hole 6-4 , the lower port of the top cover 6 is provided with an internal thread, and a sealing groove is provided.

14 and 15 , the base of the middle sleeve 20 is cylindrical, and the upper part of the middle sleeve 20 is provided with an external thread 20 - 2 to be connected with the inner thread of the lower port of the top cover 6 . An annular boss 20-1 is arranged inside the upper end of the middle sleeve 20, and the annular boss 20-1 supports the counting mechanism; the inner surface of the annular boss 20-1 is provided with a rectangular annular groove 20-9. The annular groove 20-9 is filled with liquid, the upper side and the lower side of the annular groove 20-9 are respectively equipped with sealing rings 20-6, and the sealing rings 20-6 are used to seal the liquid in the annular groove 20-9 . The center of the annular groove 20-9 is provided with two groove flow channels 20-5 symmetrically in the radial direction. There are two slider pin holes 20-4, and the slider pin holes 20-4 open up two flow channels 20-8 along the wall of the middle sleeve, which communicate with the flow channels 20-5 in the inner groove of the boss, and the annular groove 20-9 The inner liquid flows into the flow channel 20-8 through the groove flow channel 20-5. Under the inner boss of the middle sleeve, two rectangular tracks 20-7 are arranged symmetrically in the circumferential direction. The rectangular track 20-7 starts from the lower end of the boss to the bottom end of the middle sleeve and plays a guiding role.

In 38, 39 and 39-A: the lower sleeve 14 is cylindrical, and the lower sleeve 14 is screwed to the lower part of the middle sleeve 20. Two clamping plate grooves 14-1 are arranged symmetrically in the middle of the lower sleeve 14, and cylindrical holes 14-4 are symmetrically arranged on the inner wall of the clamping plate groove 14-1. The bottom surface of the lower sleeve 14 is provided with two push rod holes 14-6 and two check pin holes 14-7. The opening direction of the card slot 14-1 is the same, and the two check pin holes 14-7 are outside the two push rod holes 14-6. Two push rod rectangular holes 14-3 are provided on the upper surface of the lower sleeve 14, a push rod rectangular slide 14-5 is provided above the push rod hole 14-6, two pin channels 14-2 are provided above the check pin hole 14-7, The lower part of the sleeve 14 is provided with external threads.

In Figure 43, the cone tip 18 is bullet-shaped, the upper end of which is threadedly connected with the lower sleeve 14, the cone tip 18 is arranged at the lowermost end of the switch assembly 2, and the cone tip 18 can reduce the switch assembly 2 during the downward process. resistance.

The function of the counting mechanism is: it is used to control the switch assembly 2 not to trigger all the execution assemblies 1 before the target fracturing layer, and when the switch assembly 2 reaches a fracturing layer before the target fracturing layer, the latch is opened in time mechanism and isolation mechanism, so as to achieve the purpose of accurately triggering the execution assembly 1 of the target fracturing layer, and then accurately opening the fracturing channel.

The design concept adopted by the counting mechanism to achieve the above functions is that the counting mechanism will generate a fixed displacement every time it passes through a boss 5-3 of the execution assembly 1, so that the counting mechanism can pass through a boss 5-3 of the execution assembly 1. The purpose of one count; continue to preset the total displacement of the counting mechanism on the ground (the fixed displacement multiplied by the number of bosses 5-3 of the execution assembly 1) before the switch assembly 2 reaches the target fracturing layer. During operation, when the switch assembly 2 passes through the previous boss 5-3 of the target fracturing layer, the locking mechanism and the isolation mechanism are triggered, and the switch assembly 2 continues to move down through the boss 5-3 After that, the counting mechanism completes the execution of the total displacement, the locking mechanism and the packing mechanism are triggered, and the switch assembly 2 also enters the target fracturing layer to further open the fracturing channel of the execution assembly 1 of the target fracturing layer.

For example, the target layer of fracturing is layer 5, and the fracturing construction sequence is from bottom to top. After passing through the fourth boss 5-3, the locking mechanism and the sealing mechanism are just triggered, and the switch assembly 2 moves downward and gets stuck on the fifth actuator boss 5-3 and is set.

In Figures 9-C and 9-D: the counting mechanism includes: ratchet shaft assembly (ratchet shaft 21, ratchet sleeve 22), safety claw assembly (mainly including safety claw 19), ratchet claw assembly (mainly including push block 7, ratchet wheel Claw 28, elastic piece 29), start counting assembly 8.

As shown in FIG. 17 : the ratchet shaft assembly, including the ratchet shaft 21 and the ratchet sleeve 22 . Function: Every time a boss 5-3 passes through, the ratchet sleeve 22 moves axially downward by a fixed displacement amount, and the total displacement amount divided by the fixed displacement amount is equal to the number of 5-3 annular bosses passed through, that is, the total number of executions passed through. into a number of 1.

In FIG. 9-A , the ratchet shaft 21 is installed in the cavity enclosed by the top cover 6 and the middle sleeve 20 .

In FIGS. 18 and 19 , the base of the ratchet shaft 21 is cylindrical, the top of the ratchet shaft 21 is provided with a pressing boss 21-1, and the upper part of the ratchet shaft 21 is provided with two upper and lower circles of ratchet teeth 21-3. The ratchet shaft 21 is pushed to rotate on the ratchet teeth 21-3. An annularly arranged gear tooth 21-2 is arranged between the two sets of annular ratchet teeth 21-3, and the gear tooth 21-2 is used to prevent the ratchet shaft 21 from colliding and rotating and causing counting errors. The middle part of the ratchet shaft is provided with an annular mounting shoulder 21-4; the lower part of the ratchet shaft 21 is provided with a thread 21-8.

9-A, 14 and 15: the top cover 6 is in contact with the pressing boss 21-1, and the mounting shoulder 21-4 is pressed on the annular boss 20-1 of the middle sleeve 20. There is an inverted T-shaped flow channel inside the ratchet shaft 21, wherein the upward flow channel 21-5 is concentric with the circular hole 6-2 at the upper end of the top cover, the horizontal flow channel 21-7 symmetrically runs through the entire ratchet shaft, and the horizontal flow channel 21-7 The two ends of the liquid are communicated with the annular groove 20-9 in the middle sleeve 20; when the ratchet shaft 21 rotates, the liquid enters the horizontal flow channel 21-7 through the upward flow channel 21-5 and then flows into the annular groove 20-9.

The upward flow channel 21-5, the horizontal flow channel 21-7, the flow channel 20-5, the flow channel 20-8 and the annular groove 20-9 communicate with each other to form a first flow channel.

As shown in FIG. 9-A and FIG. 17 : the ratchet sleeve 22 is installed in the middle sleeve 20 concentrically with the ratchet shaft 21 .

20 and 21: the outer circumference of the ratchet sleeve 22 is symmetrically arranged with two long rectangular grooves 22-1, the rectangular track 20-7 in the middle sleeve is matched with the rectangular groove 22-1, and the rectangular groove 22-1 is used for In order to limit the axial rotation of the ratchet sleeve 22, it is ensured that the ratchet shaft 21 can only move in the axial direction.

Two inclined surfaces 22 - 2 are symmetrically arranged in the direction of 90° with the rectangular groove 22 - 1 on the ratchet sleeve 22 .

The bottom of the ratchet sleeve 22 is provided with a horizontal rectangular plate 22-3, and the internal thread 22-4 of the ratchet sleeve 22 is connected with the thread 21-8 of the ratchet shaft.

When the ratchet shaft 21 rotates, due to the restriction on the ratchet sleeve 22 by the rectangular rails 20-7 in the middle sleeve, the ratchet sleeve 22 can only perform downward linear motion and cannot rotate.

Every time the switch assembly 2 passes through an execution assembly 1, the ratchet shaft 21 rotates by an angle, and the ratchet sleeve 22 moves downward for a fixed distance. The number of fracturing layers, that is, the ratchet shaft assembly has a counting function. When the target fracturing layer is reached, the ratchet sleeve 22 just moves to the bottommost end of the middle sleeve 20 , and the rectangular plate 22 - 3 is in contact with the lower sleeve 14 .

In FIG. 22 , the safety pawl assembly, used to prevent the ratchet shaft 21 from rotating due to collision, includes the safety pawl 19 and the first return spring 30 .

9-C, 9-D, 10 and 23: the safety pawl 19 has a gear tooth structure 19-1 at the front end, which meshes with the upper gear tooth 21-2 of the ratchet shaft. A safety claw fixing pin hole 19 - 2 is provided in the middle, which is installed concentrically with the safety claw fixing hole 6 - 1 of the top cover 6 and the first return spring 30 . One spring leg of the first return spring 30 is fixed in the spring fixing hole 19-3. The other leg of the spring is fixed in the return spring fixing hole 6 - 4 on the top cover 6 . In the initial state, the first return spring 30 tightens the front end gear tooth structure 19-1 of the safety pawl 19 on the gear tooth 21-2 of the ratchet shaft.

In Figure 25: the ratchet pawl assembly, when passing the boss 5-3, is used to push the ratchet shaft 22 to rotate. Including: push block 7, ratchet pawl 28, elastic piece 29, second return spring 30'.

As shown in Figure 10, Figure 25 and Figure 26: the push block 7, the base body is an elliptical cylinder, its rear end is provided with a fixing hole 7-2 connected with the top cover, the left side is provided with an arc-shaped gap, and the interior of the gap is provided. There is an arc-shaped rib plate, and the center of the rib plate is provided with a push block connecting pin hole 7-3; on the lower end face of the push block 7, there is a gap 7-1 facing the fixing hole 7-2, and the upper end face of the gap 7-1 is provided A return spring fixing hole 7-4 is provided, and the notch 7-1 is used to install the second return spring 30'.

The second return spring 30 ′ sits in the push block notch 7 - 1 and is concentric with the fixing hole 7 - 2 and the push block fixing hole 6 - 3 of the top cover 6 . One of the two fixing claws of the second return spring 30' is fixed in the return spring fixing hole 7-4, and the other is fixed in the return spring fixing hole 6-4 of the top cover 6. The second return spring 30' is used for expanding Push block 7 firmly.

9-C, 10, 25, 26 and 27: the ratchet pawl 28, its front end is a pawl tip 28-1, the pawl tip 28-1 is installed against the direction of the ratchet teeth 21-3; its rear end is provided with a ratchet pawl The fixing hole 28-2 is installed concentrically with the connecting pin hole 7-3 of the push block; the middle part is provided with a gap 28-3 for installing the rib plate of the push block.

25, 26, 27, and 28: the elastic piece 29 is an arc-shaped sheet, which is fixed on the push block 7 through the connecting hole 29-2; Together, it serves to prevent the ratchet pawl 28 from disengaging from the ratchet teeth 21-3.

With reference to Figures 1, 9-A, 9-C, and 16: the start counting assembly 8 has a circular arc surface sheet at its lower part and an inclined flat plate at the upper part, and a fixing hole 8-1 is opened in the middle of the lower circular arc surface of the start counting assembly 8 ; Start the counting assembly 8 symmetrically installed on both sides of the switch body through the fixing hole 8-1.

9-A and 9-C, 9-D: the distance between the two symmetrically arranged start counting components 8 is greater than the inner diameter of the inner boss 5-3 of the inner sliding sleeve 5, and the distance between the inner sliding sleeve 5 boss 5-3 At 3:00, the two start counting components 8 are pressed inward by the boss 5-3, and one side start counting component 8 squeezes the mounting claw 19, and the mounting claw 19 takes the safety claw fixing pin hole 19-2 as the axis to overcome the first The return spring 30 is tightened and rotated, so that the front gear teeth 19-1 of the safety pawl 19 are separated from the gear teeth 21-2 of the ratchet shaft 21. After separation, the ratchet shaft 21 is in a free state and can rotate freely; at the same time, the other side Start the counting assembly 8 to squeeze the push block 7, so that the push block 7 takes the fixing hole 7-2 as the axis to overcome the tightening force of the second return spring 30' to rotate, and the push block 7 drives the ratchet pawl 28 against the ratchet teeth 21- 3. Push the ratchet shaft 21 to rotate, the ratchet shaft 21 rotates, and the lower ratchet sleeve 22 moves downward. Every time it passes through a boss 5-3, the ratchet sleeve 22 moves downward for a certain distance to complete one count.

In Figure 9-E: the isolation mechanism, including: slider assembly (slider pin 11, slider 12), rubber barrel 10, rubber barrel upper fixing sleeve 9, rubber barrel lower fixing sleeve 13.

Function: During the fracturing operation, a seal is formed between the switch assembly 2 and the inner sliding sleeve 5 to prevent the fracturing fluid from flowing out of the target fracturing formation, and to ensure the formation of high-pressure driving hydraulic force in the wellbore.

In Fig. 29: the rubber cylinder 10, the base of which is cylindrical and made of rubber, expands under the action of fracturing hydraulic force to achieve the purpose of plugging the formation.

9-A, 9-E, 16, 30 and 31: the fixing sleeve 9 on the rubber cylinder is cylindrical, and the upper part of the fixing sleeve 9 on the rubber cylinder is provided with a fixing groove 9-1 for starting the counting assembly 8 , the fixing screw holes 9-2 in the groove 9-1 and the fixing holes 8-1 are fixed by bolts; the upper fixing sleeve 9 is provided with a rubber cylinder pressing boss 9-3, and the upper part of the rubber cylinder 10 is pressed in the middle The outer surface of the sleeve 20 ensures that a seal is formed between the rubber cylinder 10 and the middle sleeve 20 , and the upper part is provided with an inner thread connected with the middle sleeve 20 .

With reference to Figures 9-A, 9-E and 32: the lower fixing sleeve 13 of the rubber cylinder is cylindrical, and there is a two-stage rubber cylinder pressing boss 13-1 inside, which presses the lower part of the rubber cylinder 10 in the middle The outer surface of the sleeve 20 ensures that a seal is formed between the rubber cylinder 10 and the middle sleeve 20 , and the lower part is provided with an inner thread for connecting with the middle sleeve 20 .

9-E, and shown in 33: the slider assembly is used to push the rubber barrel 10 to make it protrude outward, so that the liquid can flow between the rubber barrel 10 and the middle sleeve 20. Specifically, it includes: the slider pin 11 and the slider 12 .

9-A, 9-E, 15, 34 and 35: the slider pin 11 is installed in the slider pin hole 20-4 of the middle sleeve, and its front end is the arc surface 11-1; the slider pin 11 is provided with a flow channel hole 11-2 inside; the arc surface 11-1 is installed between the rubber cylinder 10 and the slider groove 20-3 of the middle sleeve, because the rubber cylinder 10 has elasticity to tighten the arc surface 11-1. Press on the outer wall of the middle sleeve 20. In the initial state, the flow channel hole 11-2 is not communicated with the flow channel 20-8 of the middle sleeve, and the tail end of the slider pin 11 is provided with an external thread.

The flow channel hole 11-2 is the second flow channel.

9-A, 33, 36 and 37: the slider 12, its base is a trapezoidal block, its outer side is a slider slope 12-1, its inner side has a threaded hole 12-2, and the slider pin 11 End threaded connection. When fracturing is started, the inclined surface 12-1 of the slider is pressed outward by the inclined surface 22-2 of the ratchet sleeve, so that a gap is formed between the rubber cylinder 10 and the middle sleeve 20, and the first flow channel and the second flow channel are connected to form a total. Flow channel; the fracturing hydraulic force enters the gap through the total flow channel. With the further increase of the fracturing hydraulic force, the gap between the rubber barrel 10 and the middle sleeve 20 becomes larger, so that the rubber barrel 10 is expanded and the seat before fracturing is reached. sealed purpose.

In FIG. 9-F : the locking mechanism, including: a card plate 15 , a push rod 23 , a check pin 16 , a card plate spring 24 , a push rod spring 25 , and a check spring 27 .

Function: to transmit the fracturing fluid force in the wellbore to the inner sliding sleeve 5, so that the inner and outer sliding sleeves 5 slide relative to each other and open the fracturing channel.

Referring to Figures 9-F, 38, 39, and 40: the card plate 15, its front end surface 15-1 is a circular arc surface, its rear end is a cylinder 15-2, and the bottom end of the cylinder is provided with a triangular hook 15-4, the card plate The bottom end is provided with a check pin hole 15-3, which is symmetrically installed in the clamping plate groove 14-1 of the lower sleeve 20, and the cylinder 15-2 is installed in the cylindrical hole 14-4. In the initial state, the card board 15 is inside the lower sleeve 14 .

Referring to Figures 9-F, 38, 39, and 42, the push rod 23 has a rectangular slideway 23-1 at the top, a triangular groove 23-2 at the middle, a ring platform 23-3, and a cylinder at the bottom 23-4 , the push rod spring 25 pushes the ring table 23-3 upward, and the push rod triangular groove 23-2 and the card triangular hook 15-4 are buckled together, preventing the force generated when the card plate spring 24 compresses from pushing the card plate 15 Push out, the slideway 23-1 of the push rod extends into the push rod rectangular hole 14-3 of the lower sleeve, and the circular ring platform 23-3 of the push rod is installed in the push rod hole 14-6 of the lower sleeve.

With reference to Figures 9-F, 39, 40, and 41: the non-return pin 16, whose base is a combination of a cylinder and a circular ring, is installed in the non-return pin hole 14-7 of the lower sleeve, and its function is to prevent the protruding card The plate 15 is retracted, and after the card plate 15 is extended, the check pin 16 under the action of the check spring 27 extends the upper cylinder of the pin 16 into the check pin hole 15-3 of the card plate through the pin channel 14-2, so as to prevent jamming. The plate 15 is retracted.

The fracturing construction sequence is from bottom to top, the bottom is the fifth fracturing layer, and the top is the 4th layer, the 3rd layer, the 2nd layer, and the 1st layer.

The working process of the sliding sleeve switch of the present invention is described below by taking the fracturing of the 5th layer as an example:

As shown in Figure 44 and Figure 44-A: in the initial state, the ratchet sleeve 22 is not in contact with the slider 12, and the first flow channel and the second flow channel are not in communication.

As shown in Figure 44 and Figure 44-B: in the initial state, the card plate spring 24, the push rod spring 25, and the check spring 27 are all in a compressed state. The push rod groove 23-2 is clamped with the clamping plate triangular hook 15-4, the clamping plate 15 is fixed in the clamping plate groove 14-1 of the lower sleeve, and the push rod 23 protrudes 20mm above the lower sleeve 14.

When fracturing the 5th layer, the switch assembly 2 must pass through the bosses 5-3 of four actuators before reaching the fracturing layer. The ratchet shaft 21 of the designed switch mechanism rotates and the ratchet sleeve 22 moves downward by 20mm, that is, The fixed displacement is 20 mm, so set the distance from the ratchet sleeve 22 to the bottom end of the lower sleeve 14 before construction as [total displacement = fixed displacement × (the number of layers of the target fracturing layer - 1)] as 20 mm × (5- 1)=80mm, the distance to the push rod 23 is 60mm.

Before construction, in the wellbore corresponding to the corresponding formation, prefabricated 5 execution assemblies 1 on the casing in advance.

Put the switch assembly 2 into the wellbore, press the switch assembly 2, the switch assembly 2 runs downward, and when it passes through the bosses 5-3 on the first inner sliding sleeve, the counting components 8 are activated on both sides to go inward. The diameter reduction pushes the push block 7 and the safety claw 19 to move inward, and the safety claw 19 rotates around the fixed pin hole 19-2, so that the gear tooth 19-1 is disengaged from the ratchet shaft gear tooth 21-2, and the push block 7 is The fixed hole 7-2 rotates as the center, the shrapnel 29 presses the ratchet pawl 28 on the ratchet tooth 21-3, the push block 7 drives the ratchet pawl 28 to rotate together, and the pawl tip 28-1 is opposite to the tooth shape of the ratchet tooth 21-3. Movement, the ratchet shaft 21 is rotated, and the ratchet sleeve 22 is threadedly connected with the ratchet shaft 21. Since the rectangular track 20-7 in the middle sleeve restricts the rotation of the ratchet sleeve 22, the ratchet sleeve 22 moves down along the rectangular track 20-7 by 20mm, At this time, the distance from the lower sleeve 14 is still 60mm, and the distance from the push rod 23 is 40mm.

When the switch assembly 2 passes through the boss 5-3 on the second actuating assembly 1, the action process is the same as above, the ratchet sleeve 22 moves down along the rectangular track 20-7 by 20mm, the distance from the lower sleeve 14 is 40mm, and the distance from the push rod 23 At a distance of 20 mm, the ratchet sleeve 22 is not in contact with the slider 12 .

As shown in Figure 44-C: when the switch assembly 2 passes through the boss 5-3 of the third execution assembly 1, the action process is the same as above, and the ratchet sleeve 22 moves downward along the rectangular track 20-7 by 20mm, and the distance from the lower sleeve 14 is 20mm away, just in contact with the push rod 23 and the slider 12.

When the switch assembly 2 passes through the boss 5-3 on the fourth inner sliding sleeve, the ratchet sleeve 22 continues to move downward for 20mm along the rectangular track 20-7. During the movement of the ratchet sleeve 22, the push rod 23 is pressed downward to trigger the card. Lock mechanism, press the slider 12 outward to trigger the isolation mechanism; after passing through the boss 5-3 of the fourth executive assembly 1, the slider 12 moves outward to the maximum distance, and the upper surface of the push rod 23 and the upper surface of the lower sleeve 14 Flush; as shown in Figure 45.

As shown in Figure 45, the isolation mechanism is triggered: the ratchet sleeve 22 gradually contacts the slider assembly during the downward movement. Since the ratchet sleeve 22 is of a large upper and a lower structure, the inclined surface 22-2 of the ratchet sleeve 22 squeezes the inclined surface 12 of the slider. -1, when the ratchet sleeve 22 moves to the lowermost end, the slider mechanism is extruded to the maximum position, the rubber barrel is raised to the outside, and the slider pin shaft flow channel 11-2 is connected with the middle sleeve flow channel 20-8 to form a communication channel , the hydraulic force enters the gap formed by the bulge of the rubber cylinder through the communication channel.

45, trigger the locking mechanism: during the downward movement of the ratchet sleeve 22, the rectangular plate 22-3 at the lower end of the ratchet sleeve 22 squeezes the push rod 23 to move downward, and the push rod groove 23-2 is connected to the triangular hook of the clamping plate. 15-4 is disengaged, the clamping plate 15 extends outward, and the pin 16 extends into the non-return pin hole 15-3 under the action of the check spring 27 to prevent the clamping plate 15 from being retracted by external force.

The switch assembly 2 continues to move down under the action of pressure. When the card board 15 encounters the boss 5-3 of the fifth execution assembly 1, the switch assembly 2 is stuck on the boss 5-3 of the execution assembly 1. , ready for fracturing.

When the clamping plate 15 is stuck on the boss 5-3 of the fifth execution assembly 1, the fifth execution assembly 1 corresponds to the stratum to be fracturing, and the pressure in the wellbore increases continuously and the rubber barrel 10 rises larger and larger. , and finally realize the expansion setting with the wellbore. The higher the pressure, the better the setting effect, preventing the leakage of the fracturing fluid to the formation below. After the packing mechanism is set, the hydraulic force acts on the switch assembly 2 and is transmitted through the clamping plate 15. On the inner sliding sleeve 5, the inner sliding sleeve 5 is moved down, the fracturing hole 5-1 on the inner sliding sleeve 5 is opposite to the outer fracturing hole 4-1 on the lower joint 4, and the lowermost end of the inner sliding sleeve 5 moves to The downward movement is stopped at the stop boss 4-3 inside the lower joint 4, and the fracturing channel is fully opened.

In the same way, when fracturing the fourth layer, the switch assembly 2 must pass through three bosses 5-3 of the execution assembly 1 before reaching the fracturing layer, so the distance from the ratchet sleeve 22 to the lower sleeve 14 is set before construction. It is [total displacement=(the number of layers of the target fracturing layer-1)×fixed displacement] is (4-1)×20mm=60mm, and the distance from the push rod 23 is 40mm.

For stage 3 and stage 2 fracturing, the distances from the ratchet sleeve 22 to the lower sleeve 14 are preset to be 40 mm and 20 mm, respectively.

When fracturing the first layer, trigger the isolation mechanism and locking mechanism inside the switch assembly 2 on the ground in advance, then put it into the wellbore, and sit on the boss of the execution assembly 1 closest to the wellhead 5- 3, the implementation of fracturing operations.

The above-mentioned embodiments are only for expressing the embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications, equivalent replacements, improvements, etc. can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims (10)

1. A countable downhole full-bore fracturing sliding sleeve, comprising a switch assembly (2) and at least one execution assembly (1), the execution assembly (1) being connected to a wellbore, the execution assembly (1) There is a boss (5-3) in it; the switch assembly (2) is put into the wellbore, and it is characterized in that: The switch assembly (2) includes a counting mechanism, a sealing mechanism and a locking mechanism; When the switch assembly (2) goes down through the boss (5-3) in the wellbore, the boss (5-3) contacts the counting mechanism to form a driving force; the driving force is used to trigger the operation of the counting mechanism and generate a fixed displacement; The fixed displacement is used to calculate the total displacement; The total displacement is equal to the fixed displacement × (the number of layers of the target fracturing layer-1); Presetting the total displacement into the counting mechanism; When the counting mechanism finishes executing the total displacement, the counting mechanism activates the packing mechanism and the locking mechanism, and the switch assembly (2) descends to the target fracturing layer; The packing mechanism is used for setting the formation during the fracturing operation so that the fracturing fluid forms a driving hydraulic force in the wellbore; The locking mechanism is used for the switch assembly (2) to sit on the boss (5-3) when it reaches the target fracturing layer, and to pass the driving hydraulic force through the boss (5-3) Transfer to the execution assembly (1) corresponding to the target fracturing layer; The driving hydraulic force is used to drive the execution assembly (1) to open the fracturing channel of the target fracturing layer. 2. a kind of countable downhole full-bore fracturing sliding sleeve according to claim 1, is characterized in that: The switch assembly (2) includes: a switch body; The switch body includes: a top cover (6), a middle cover (20) and a lower cover (14); the top cover (6) is connected with the middle sleeve (20); The middle sleeve (20) is provided with an annular boss (20-1); the annular boss (20-1) for supporting the counting mechanism; Two tracks (20-7) are symmetrically arranged on the inner wall of the middle sleeve (20) below the annular boss (20-1); The lower sleeve (14) is connected to the lower end of the middle sleeve (20); The locking mechanism connection structure is arranged on the lower sleeve (14). 3. a kind of countable downhole full-bore fracturing sliding sleeve according to claim 2, is characterized in that: The counting mechanism includes a linear displacement mechanism and a driving mechanism; the drive mechanism is connected to the top cover (6); During the downward process of the switch assembly (2) in the wellbore, the driving mechanism is in contact with the boss (5-3) to generate the driving force; The driving force is used to drive the linear displacement mechanism to generate the fixed displacement amount. 4. a kind of countable downhole full-bore fracturing sliding sleeve according to claim 3, is characterized in that: The linear displacement mechanism includes a ratchet shaft (21) and a ratchet sleeve (22); The ratchet shaft (21) is rotatably connected to the annular boss (20-1); Two through-length rectangular grooves (22-1) are symmetrically arranged on the outer circumference of the ratchet sleeve (22); The track (20-7) is connected with the rectangular groove (22-1) as a linear sliding guide rail mechanism; The sliding guide mechanism is used for displacement guidance of the ratchet sleeve (22) and restricting the axial rotation of the ratchet sleeve (22); The ratchet sleeve (22) is coaxially threaded with the ratchet shaft (21); The driving force drives the ratchet shaft (21) to rotate by a fixed angle, and at the same time, the ratchet sleeve (22) moves along the sliding guide rail mechanism by the fixed displacement amount. 5. a kind of countable downhole full-bore fracturing sliding sleeve according to any one of claims 4, is characterized in that: The drive mechanism includes: a push block (7), a ratchet pawl (28) and a start counting assembly (8); The push block (7) shaft is connected to the top cover (6); Ratchet teeth (21-3) are arranged on the ratchet shaft (21); The ratchet pawl (28) is connected with the push block (7); The ratchet pawl (28) and the ratchet teeth (21-3) constitute a ratchet mechanism; The start counting assembly (8) is attached to the outer side of the push block (7); When the switch assembly (2) passes through the boss (5-3), the boss (5-3) presses the start counting assembly (8); the extrusion is used to form the driving force; The driving force is used to drive the push block (7) to drive the ratchet pawl (28) to rotate; The ratchet pawl (28) rotates to push the ratchet teeth (21-3) to drive the ratchet shaft (1) to rotate by a fixed angle. 6. a kind of countable downhole full-bore fracturing sliding sleeve according to claim 5, is characterized in that: The start counting assembly (8) has a circular arc surface sheet at its lower part and an inclined flat plate at its upper part; A fixing hole (8-1) is opened on the circular arc panel sheet; the fixing hole (8-1) for connecting with the switch body; The distance between the two symmetrically arranged inclined plates is greater than the inner diameter of the boss (5-3); The inclined flat plate is attached to the outer side of the push block (7); The boss (5-3) presses the inclined plate to form the driving force. 7. A kind of countable downhole full-bore fracturing sliding sleeve according to claim 6 is characterized in that: The counting mechanism further includes: a safety claw assembly; The safety claw assembly includes: a safety claw (19) and a first return spring (30); The upper part of the ratchet shaft (21) is provided with gear teeth (21-2); The front end of the safety claw (19) is a gear tooth structure (19-1), and its central shaft is connected to the top cover; the gear tooth structure (19-1) meshes with the gear tooth (21-2); The first return spring (30) is used to tighten the gear tooth structure (19-1) on the gear tooth (21-2); One of the inclined flat plates is attached to the side surface of the safety claw (19) for pressing the safety claw (19); The safety claw (19) rotates against the tightening force with the shaft as the center under the pressing action; The safety claw (19) rotates for the purpose of separating the gear tooth structure (19-1) from the gear tooth (21-2); The separation is used for the free rotation of the ratchet shaft (21). 8. a kind of countable downhole full-bore fracturing sliding sleeve according to claim 5, is characterized in that: The isolation mechanism includes: a slider assembly and a rubber cylinder (10); The rubber cartridge (10) is sleeved on the outside of the middle sleeve (20); the slider assembly is connected to the middle sleeve; The middle sleeve (20) is provided with a first flow channel; the slider assembly has a second flow channel; When the counting mechanism activates the packing mechanism, the slider assembly is used to push the rubber cylinder (10) to form a gap with the middle sleeve (20), and push the rubber cylinder (10) to the middle sleeve (20). The first flow channel is communicated with the second flow channel to form a total flow channel; The fracturing hydraulic force enters the gap through the main flow channel; The fracturing hydraulic force is used to expand the gap and expand the rubber cylinder (10). 9. A kind of countable downhole full-bore fracturing sliding sleeve according to claim 5 is characterized in that: The locking mechanism includes: a pop-up assembly, a start-up assembly and a locking assembly; When the switch assembly (2) passes through the previous layer of the target fracturing layer, the ejection assembly is ejected radially, and the switch assembly (2) reaches the target fracturing layer and stops on the convex on stage (5-3); the counting mechanism activates the activation assembly; the start-up assembly for triggering the radial ejection of the ejection assembly; The locking assembly is used for locking the ejected assembly when the ejected assembly is seated on the boss (5-3). 10. A kind of countable downhole full-bore fracturing sliding sleeve according to claim 9 is characterized in that: The ejecting assembly includes: a card plate (15) and a card plate spring (24); The clamping plate (15) is symmetrically mounted on the lower sleeve (20); The bottom end of the clamping plate (15) is provided with a triangular hook structure (15-4) and a non-return pin hole (15-3); The starting assembly includes: a push rod (23) and a push rod spring (25); The push rod (23) has a triangular groove (23-2); The triangular hook structure (15-4) is fastened together with the triangular groove (23-2) to prevent the card plate (15) from popping out radially; A clamping plate spring (24) is connected between the push rod (23) and the clamping plate (15); The counting mechanism presses down the push rod spring (25), and when the triangular hook structure (15-4) of the push rod (23) is disengaged from the triangular groove (23-2), the clamping plate a spring (24) for applying radial ejection force to the card plate (15); The locking assembly includes: a non-return pin (16) and a non-return spring (27); When the card plate (15) is ejected radially and stops on the boss (5-3), the check spring (27) pushes the check pin (16) into the check pin hole ( 15-3); The non-return pin (16) is used for locking the ejection assembly on the boss (5-3).