CN221032546U - Throttle ball fracturing sliding sleeve with can drag for, can switch, big latus rectum - Google Patents

Abstract

The utility model belongs to the technical field of ball throwing fracturing sliding sleeves, in particular to a throttling ball throwing fracturing sliding sleeve with a large-diameter and capable of being fished and opened, which comprises a pipe group sliding sleeve structure and an opening and closing fishing device, wherein the pipe group sliding sleeve structure comprises a joint, the outer side of the right end of the joint is sleeved with an outer cylinder, an injection hole is arranged on the outer side of the outer cylinder, an outer sliding sleeve is slidably arranged in the outer cylinder, an inner sliding sleeve structure is arranged on the inner side of the outer sliding sleeve, the inner sliding sleeve structure comprises a fishing head, a ball seat and a first inner saw tooth section are arranged on the inner side of the fishing head, an inner locking pipeline is fixedly connected to the inner side of the right end of the fishing head, a saw tooth ring mounting groove is arranged on the outer side of the inner locking pipeline, an outer saw tooth ring is arranged in the saw tooth ring mounting groove on the outer side of the inner locking pipeline, a positioning sleeve is sleeved on the outer side of the inner locking pipeline, and an elastic split is arranged on the left end of the positioning sleeve.

Description

Throttle ball fracturing sliding sleeve with can drag for, can switch, big latus rectum

Technical Field

The utility model belongs to the technical field of ball throwing fracturing sliding sleeves, and particularly relates to a throttling ball throwing fracturing sliding sleeve with a large drift diameter, which can be used for fishing and switching.

Background

The fracturing sliding sleeve is a tool applied to the existing segmented reconstruction fracturing yield increasing technology. And after the fracturing construction is completed, the pipe column is produced normally. However, when a certain water outlet is required to be closed or certain layers are abandoned, the fracturing sliding sleeve is required to be closed, and the limitation of the common fracturing sliding sleeve structure cannot be realized. Furthermore, the fracturing ball seats with different sizes and used for grading are arranged in the fracturing sliding sleeve, so that the inner diameter of the fracturing sliding sleeve is greatly limited, when a measure tool is needed to be put into the fracturing sliding sleeve in the later period, a milling tool is needed to be put into the fracturing sliding sleeve, the ball seats are gradually drilled and ground off, and the production cost, the construction safety and the construction time efficiency are influenced.

Disclosure of utility model

In view of the above problems, an object of the present utility model is to: the device can conveniently take out the inner sliding sleeve structure and drive the outer sliding sleeve to close the injection hole, and provides great convenience for the installation and layer giving up of follow-up measure tools.

In order to achieve the above object, the present utility model provides the following technical solutions: the utility model provides a but throttle ball fracturing sliding sleeve with drag for, but switch, big latus rectum, includes nest sliding sleeve structure and switch fishing device, nest sliding sleeve structure includes the joint, the right-hand member outside and the urceolus of joint cup joint, the outside of urceolus is equipped with the jet orifice, the inside slidable mounting of urceolus has outer sliding sleeve, the inboard of outer sliding sleeve is equipped with interior sliding sleeve structure, interior sliding sleeve structure includes the salvage head, the inboard of salvage head is equipped with ball seat and first interior sawtooth section, the inboard fixedly connected with inner locking pipeline of right-hand member of salvage head, the outside of inner locking pipeline is equipped with the sawtooth ring mounting groove, the outside of inner locking pipeline is located the sawtooth ring mounting groove and is equipped with outer sawtooth ring, the outside cover of inner locking pipeline is equipped with the spacer sleeve, the left end of spacer sleeve is equipped with elasticity split, the end of elasticity split sleeve is equipped with spacing recess, the inboard of spacer sleeve is equipped with second interior section, the outside of inner locking pipeline is equipped with the groove, the right side of urceolus is equipped with the connecting portion, the switch cooperation is equipped with the sawtooth ring.

The beneficial effects of the utility model are as follows: the device is provided with the inner sliding sleeve structure capable of being salvaged and the outer sliding sleeve capable of being closed, and is matched with the setting of the switch salvaging device, the inner sliding sleeve structure can be conveniently taken out and the outer sliding sleeve is driven by the switch to enable the outer sliding sleeve to close the injection hole, and great convenience is provided for the installation of follow-up measure tools and the giving up of the horizon.

To enable the outer toothed ring to be more tightly clasped with the second inner toothed segment:

As a further improvement of the above technical scheme: the left end of the sawtooth ring mounting groove is a forty-five degree inclined plane, and the left side surface of the outer sawtooth ring is a forty-five degree inclined plane.

The beneficial effects of this improvement are: because the left end of sawtooth ring mounting groove is forty-five degree inclined planes, the left surface of outer sawtooth ring is forty-five degree inclined planes, even if interior locking pipeline backward slides, can also make outer sawtooth ring expanded because of the extrusion of sawtooth ring mounting groove and outer sawtooth ring inclined planes, makes its inseparabler withhold with the interior sawtooth section of second, effectively avoids the condition of backward sliding.

In order to seal between the external sliding sleeve and the outer cylinder, between the salvaging head and the external sliding sleeve, the internal locking pipeline and the salvaging head are:

As a further improvement of the above technical scheme: the outside of outer sliding sleeve is equipped with first seal groove, the outside of salvaging the head is equipped with the second seal groove, the inboard of salvaging the head is equipped with the third seal groove, the inside of first seal groove, second seal groove and third seal groove all is equipped with the sealing washer.

The beneficial effects of this improvement are: the first sealing groove, the second sealing groove, the third sealing groove and the sealing ring are arranged, and sealing is carried out between the outer sliding sleeve and the outer cylinder, between the salvage head and the outer sliding sleeve, and between the inner locking pipeline and the salvage head.

In order to fix the outer cylinder and the outer sliding sleeve, the inner locking pipeline and the positioning sleeve:

as a further improvement of the above technical scheme: the outer cylinder is connected with the outer sliding sleeve through bolts, a gasket is arranged between the outer cylinder and the outer sliding sleeve, a first shearing pin is mounted on the gasket in a screwed connection mode, the first shearing pin is connected with the outer sliding sleeve, and a second shearing pin is connected between the positioning sleeve and the inner locking pipeline.

The beneficial effects of this improvement are: the first shearing pin and the second shearing pin fix the outer cylinder and the outer sliding sleeve, and the inner locking pipeline and the positioning sleeve.

In order to play a role in positioning the external sliding sleeve:

As a further improvement of the above technical scheme: the inner side of the outer cylinder is provided with a first positioning groove and a second positioning groove, the outer side of the outer sliding sleeve is provided with a positioning ring, and the outer side of the positioning ring is provided with a positioning convex ring.

The beneficial effects of this improvement are: the positioning ring, the positioning convex ring, the first positioning groove and the second positioning groove are matched to play a role in positioning the outer sliding sleeve.

In order to pull the fishing head, the outer sliding sleeve moves:

As a further improvement of the above technical scheme: the switch salvaging device comprises a base, a pipeline connecting seat is arranged at the left end of the base, a salvaging connecting seat is arranged at the right end of the base, an outer saw tooth elastic split is arranged at the right end of the salvaging connecting seat, an inner telescopic cavity communicated with the outer telescopic cavity is arranged inside the base, and a switch limiting block is slidably arranged in the telescopic cavity.

The beneficial effects of this improvement are: the outer sawtooth elasticity split can get into the inside of salvaging the head and mesh with first interior sawtooth section through its elasticity, pulls salvaging the head and removes, and the switch stopper stretches out along flexible chamber, can form spacingly between the cooperation groove of switch, drives outer sliding sleeve and removes.

In order to support the outer sawtooth elastic split, the outer sawtooth elastic split cannot slip with the first inner sawtooth section:

As a further improvement of the above technical scheme: the inside of base is installed first pneumatic cylinder, the piston rod end and the holding ring of first pneumatic cylinder are connected.

The beneficial effects of this improvement are: when the inner sliding sleeve structure is required to be taken out, the switch salvaging device is lowered to the inner side of the outer sliding sleeve through a pipeline, so that the outer sawtooth elastic split can enter the inner side of the salvaging head through elasticity of the switch salvaging device to be meshed with the first inner sawtooth section, and the first hydraulic cylinder is controlled to push the supporting ring to slide from the inner side of the base to the inner side of the outer sawtooth elastic split, so that the outer sawtooth elastic split is supported, and cannot slide between the outer sawtooth elastic split and the first inner sawtooth section.

In order to drive the outer sliding sleeve to slide leftwards:

As a further improvement of the above technical scheme: the inside of base is equipped with the second pneumatic cylinder, the piston rod of second pneumatic cylinder rotates with first bull stick to be connected, the other end and the second bull stick of first bull stick rotate to be connected, the other end and the inner wall of base of second bull stick rotate to be connected, the junction of first bull stick and second bull stick rotates with the rotation connecting seat on the switch stopper to be connected.

The beneficial effects of this improvement are: when the injection hole needs to be closed, the switch salvaging device is placed into the inner side of the outer sliding sleeve, the base is enabled to enter the inner side of the switch matching groove, the second hydraulic cylinder is controlled to push out to drive the first rotating rod to rotate, the switch limiting block is driven to extend out along the telescopic cavity under the matching of the second rotating rod, the switch limiting block can be limited with the switch matching groove, and the switch salvaging device is pulled at the moment to drive the outer sliding sleeve to slide leftwards.

None of the parts of the device are the same as or can be implemented using prior art.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is a schematic view of the present utility model in cross-section during fishing;

FIG. 3 is an enlarged view of the structure of the portion A of the present utility model;

FIG. 4 is a schematic view of the present utility model in cross-section with the outer sleeve open;

FIG. 5 is an enlarged view of the B part of the present utility model;

FIG. 6 is a schematic view of the inner sliding sleeve structure in the present utility model;

FIG. 7 is a schematic view of a cut-away structure of a positioning sleeve according to the present utility model;

FIG. 8 is a schematic view of the positioning sleeve according to the present utility model;

FIG. 9 is a schematic view of the fishing head of the present utility model in cross-section;

FIG. 10 is a schematic view of the structure of the inner locking pipe of the present utility model;

FIG. 11 is a schematic view of the positioning sleeve and inner locking tube of the present utility model in cross-section;

FIG. 12 is a schematic view of the right side cross-sectional structure of the switch fishing device of the present utility model;

FIG. 13 is a right side elevational view of the switch fishing apparatus of the present utility model;

FIG. 14 is a schematic view of a retainer ring according to the present utility model;

In the figure: 1. a tube group sliding sleeve structure; 2. a switch salvaging device; 3. a joint; 4. an outer cylinder; 5. an injection hole; 6. an outer sleeve; 8. a fishing head; 9. a ball seat; 10. a first inner serration section; 11. an inner locking pipe; 12. a sawtooth ring mounting groove; 13. an outer serrated ring; 14. a positioning sleeve; 15. elastic split; 16. a limit protrusion; 17. a limit groove; 18. a second inner serration section; 19. a storage groove; 20. a connection part; 21. a switch mating groove; 22. a first seal groove; 23. a second seal groove; 24. a third seal groove; 25. a seal ring; 26. a gasket; 27. a first shear pin; 28. a second shear pin; 29. a first positioning groove; 30. a second positioning groove; 31. a positioning ring; 32. positioning the convex ring; 33. a base; 34. a pipeline connecting seat; 35. salvaging the connecting seat; 36. the external saw teeth elastically split; 37. a telescopic chamber; 38. a switch limiting block; 39. a first hydraulic cylinder; 40. a support ring; 41. a second hydraulic cylinder; 42. a first rotating lever; 43. a second rotating rod; 44. and rotating the connecting seat.

Detailed Description

In order that those skilled in the art may better understand the technical solutions of the present invention, the following detailed description of the present invention with reference to the accompanying drawings is provided for exemplary and explanatory purposes only and should not be construed as limiting the scope of the present invention.

As shown in fig. 1-14, the throttle ball-throwing fracturing sliding sleeve with the large-diameter and capable of being fished and opened comprises a pipe group sliding sleeve structure 1 and an opening and closing fishing device 2, wherein the pipe group sliding sleeve structure 1 comprises a joint 3, the outer side of the right end of the joint 3 is sleeved with an outer cylinder 4, the outer side of the outer cylinder 4 is provided with an injection hole 5, the inner side of the outer cylinder 4 is slidably provided with an outer sliding sleeve 6, the inner side of the outer sliding sleeve 6 is provided with an inner sliding sleeve structure, the inner side of the inner sliding sleeve structure comprises a fishing head 8, the inner side of the fishing head 8 is provided with a ball seat 9 and a first inner saw tooth section 10, the inner side of the right end of the fishing head 8 is fixedly connected with an inner locking pipeline 11, the outer side of the inner locking pipeline 11 is provided with a saw tooth ring mounting groove 12, the outside of interior locking pipeline 11 is located and is equipped with outer sawtooth ring 13 in sawtooth ring mounting groove 12, the outside cover of interior locking pipeline 11 is equipped with spacer sleeve 14, the left end of spacer sleeve 14 is equipped with elasticity split 15, the end of elasticity split 15 is equipped with spacing arch 16, the inboard of outer sliding sleeve 6 is equipped with spacing recess 17, the inboard of spacer sleeve 14 is equipped with the interior sawtooth section 18 of second, the outside of interior locking pipeline 11 is equipped with storage tank 19, the right side of urceolus 4 is equipped with joint connection portion 20, the inboard of outer sliding sleeve 6 is equipped with switch cooperation groove 21. The device is provided with the inner sliding sleeve structure capable of being salvaged and the outer sliding sleeve 6 capable of being closed, and is matched with the setting of the switch salvaging device 2, the inner sliding sleeve structure can be conveniently taken out and the outer sliding sleeve 6 is driven by the switch to close the injection hole 5, and great convenience is provided for the installation of follow-up measure tools and the giving up of the horizon. The left end of the sawtooth ring mounting groove 12 is a forty-five degree inclined surface, and the left side surface of the outer sawtooth ring 13 is a forty-five degree inclined surface. Because the left end of sawtooth ring mounting groove 12 is forty-five degree inclined planes, the left surface of outer sawtooth ring 13 is forty-five degree inclined planes, even if interior locking pipeline 11 backward slides, also can make outer sawtooth ring 13 by the extrusion of sawtooth ring mounting groove 12 and outer sawtooth ring 13 inclined planes, make its inseparabler withhold with second interior sawtooth section 18, effectively avoid the circumstances of backward sliding, the outside of outer sliding sleeve 6 is equipped with first seal groove 22, the outside of salvaging head 8 is equipped with second seal groove 23, the inboard of salvaging head 8 is equipped with third seal groove 24, the inside of first seal groove 22, second seal groove 23 and third seal groove 24 all is equipped with sealing washer 25. The first sealing groove 22, the second sealing groove 23, the third sealing groove 24 and the sealing ring 25 are arranged between the outer sliding sleeve 6 and the outer cylinder 4, between the salvaging head and the outer sliding sleeve 6, the inner locking pipeline 11 and the salvaging head are sealed, a gasket 26 is arranged between the outer cylinder 4 and the outer sliding sleeve 6, a first shearing pin 27 is arranged on the gasket 26 in a screwed connection mode, the first shearing pin 27 is connected with the outer sliding sleeve 6, and a second shearing pin 28 is connected between the positioning sleeve 14 and the inner locking pipeline 11. The first shear pin 27 and the second shear pin 28 fix the space between the outer cylinder 4 and the outer sleeve 6 and the space between the inner locking pipe and the positioning sleeve 14. The inner side of the outer cylinder 4 is provided with a first positioning groove 29 and a second positioning groove 30, the outer side of the outer sliding sleeve 6 is provided with a positioning ring 31, the outer side of the positioning ring 31 is provided with a positioning convex ring 32, and the positioning ring 31, the positioning convex ring 32, the first positioning groove 29 and the second positioning groove 30 are matched to play a role in positioning the outer sliding sleeve. The switch salvage device 2 comprises a base 33, a pipeline connecting seat 34 is arranged at the left end of the base 33, a salvage connecting seat 35 is arranged at the right end of the base 33, an outer sawtooth elastic split 36 is arranged at the right end of the salvage connecting seat 35, a telescopic cavity 37 communicated with the inside and the outside is arranged in the base 33, and a switch limiting block 38 is slidably arranged in the telescopic cavity 37. The outer sawtooth elasticity split 36 can get into the inside of salvaging the head 8 through its elasticity and mesh with first interior sawtooth section 10, pulls salvaging the head 8 and removes, and the switch stopper 38 stretches out along flexible chamber 37, can form the spacing between the cooperation groove 21 with the switch, drives outer sliding sleeve 6 and removes, the internally mounted of base 33 has first pneumatic cylinder 39, the piston rod end and the holding ring 40 of first pneumatic cylinder 39 are connected. When the inner sliding sleeve structure needs to be taken out, the switch salvaging device 2 is lowered to the inner side of the outer sliding sleeve 6 through a pipeline, the outer sawtooth elastic split 36 can enter the inner side of the salvaging head 8 to be meshed with the first inner sawtooth section 10 through elasticity of the switch salvaging device, at the moment, the first hydraulic cylinder 39 is controlled to push the supporting ring 40 to slide from the inner side of the base 33 to the inner side of the outer sawtooth elastic split 36, the outer sawtooth elastic split 36 is supported so as not to slide between the outer sawtooth elastic split 36 and the first inner sawtooth section 10, a second hydraulic cylinder 41 is arranged in the base 33, a piston rod of the second hydraulic cylinder 41 is rotationally connected with the first rotating rod 42, the other end of the first rotating rod 42 is rotationally connected with the second rotating rod 43, the other end of the second rotating rod 43 is rotatably connected with the inner wall of the base 33, and the connection part of the first rotating rod 42 and the second rotating rod 43 is rotatably connected with the rotation connection seat 44 on the switch limiting block 38. When the injection hole 5 needs to be closed, the switch salvaging device 2 is put into the inner side of the outer sliding sleeve 6, the base 33 is made to enter the inner side of the switch matching groove 21, the second hydraulic cylinder 41 is controlled to push out to drive the first rotating rod 42 to rotate, the switch limiting block 38 is driven to extend out along the telescopic cavity 37 under the matching of the second rotating rod 43, the limit can be formed between the switch limiting block and the switch matching groove 21, and the switch salvaging device 2 is pulled at the moment, so that the outer sliding sleeve 6 can be driven to slide leftwards.

The working principle and the using flow of the utility model are as follows: when the device is used, a ball is thrown into the outer cylinder 4 from the joint 3, the ball enters the inner side of the fishing head 8 to prop against the ball seat 9, at the moment, the ball is injected and pressurized through an oil pipe, the fishing head 8 is driven to move rightwards by pushing the ball through pressure, the inner locking pipeline 11 and the positioning sleeve 14 are pushed to move rightwards by using the fishing head 8, the limit protrusion 16 is kept to be embedded and limited between the limit protrusion and the limit groove 17 by using the support of the inner locking pipeline 11 and the fishing head 8 on the elastic split 15, so that the outer sliding sleeve 6 is driven to move rightwards, the first shearing pin 27 is sheared by shearing force, and in the process of rightwards moving the outer sliding sleeve 6, the positioning ring 31 originally clamped in the first positioning groove 29 and the positioning convex ring 32 are extruded and deformed, are separated from the first positioning groove 29 and slide into the second positioning groove 30 along with the sliding of the outer sliding sleeve 6, the outer sliding sleeve 6 moves to a proper position at the moment, the injection hole 5 is completely opened, the injection fracturing operation can be started at the moment, when the inner sliding sleeve structure needs to be taken out, the switch salvaging device 2 is lowered to the inner side of the outer sliding sleeve 6 through a pipeline, the outer sawtooth elastic split 36 can enter the inner side of the salvaging head 8 to be meshed with the first inner sawtooth section 10 through the elasticity of the outer sawtooth elastic split 36, the first hydraulic cylinder 39 is controlled to push the supporting ring 40 to slide from the inner side of the base 33 to the inner side of the outer sawtooth elastic split 36 at the moment, the external sawtooth elastic split 36 is supported so as not to slip with the first internal sawtooth section 10, at the moment, the fishing head 8 is pulled to move leftwards through a pipeline, the fishing head 8 is driven to move leftwards while the internal locking pipeline 11 is moved leftwards, the second shearing pin 28 connected between the internal locking pipeline 11 and the positioning sleeve 14 is sheared by the shearing force pulled by the internal locking pipeline 11, so that the internal locking pipeline 11 moves leftwards along with the movement of the fishing head 8, when the internal locking pipeline 11 moves, the external sawtooth ring 13 is driven to move leftwards together through the limit between the sawtooth ring mounting groove 12 and the external sawtooth ring 13, so that the external sawtooth ring 13 moves to the inner side of the second internal sawtooth section 18 along with the movement of the external sawtooth ring, and engaged with the second inner serration 18, as shown in the attached drawings, after entering the inner side of the second inner serration 18, the outer serration 13 cannot move back due to the serration shape, because the left end of the serration mounting groove 12 is a forty-five degree inclined plane, the left side of the outer serration 13 is a forty-five degree inclined plane, even if the inner locking pipe 11 slides back, the outer serration 13 is expanded due to the extrusion of the serration mounting groove 12 and the inclined plane of the outer serration 13, so that the outer serration 13 is buckled with the second inner serration 18 more tightly, the condition of sliding back is effectively avoided, along with the movement of the fishing head 8 and the inner locking pipe 11, when the inner locking pipeline 11 moves to a position capable of pulling the positioning sleeve 14, the elastic split 15 loses bearing support, at the moment, the inner sliding pipe structure is pulled continuously, the limit protrusion 16 is extruded and deformed and separated from the limit groove 17 to enter a space between the storage groove 19 on the outer side of the inner locking pipeline 11 and the outer sliding sleeve 6, so that the positioning sleeve 14 also moves along with the movement of the inner locking pipeline 11 until the whole inner sliding sleeve structure is pulled out of the outer sliding sleeve 6, the inner sliding sleeve is fished out, the lower-in measure tool is facilitated, when the injection hole 5 needs to be closed, the switch salvaging device 2 is lowered into the inner side of the outer sliding sleeve 6, the base 33 enters the inner side of the switch matching groove 21, the second hydraulic cylinder 41 is controlled to push out to drive the first rotating rod 42 to rotate, the switch limiting block 38 is driven to extend along the telescopic cavity 37 under the cooperation of the second rotating rod 43 to form limiting with the switch cooperation groove 21, the switch salvaging device 2 is pulled at the moment, the outer sliding sleeve 6 can be driven to slide leftwards, when the outer sliding sleeve 6 slides leftwards, the positioning ring 31 and the positioning convex ring 32 are separated from the second positioning groove 30, the reaction force of pulling is changed at the moment, the pulling is continued at the moment, when the outer sliding sleeve 6 reaches the closing position, the positioning ring 31 and the positioning convex ring 32 are moved into the first positioning groove 29, the reaction force of pulling is changed again at the moment, through the change of reaction force, whether can judge to close in place, in sum, this device is provided with the interior sliding sleeve structure that can salvage and the outer sliding sleeve 6 that can close, and cooperation switch fishing device 2's setting can be convenient take out interior sliding sleeve structure and close and drive outer sliding sleeve 6 and make it close jet hole 5, for follow-up measure installation of instrument, the giving up at level provides very big facility.

Claims (8)

1. The utility model provides a throttle ball fracturing sliding sleeve with can drag for, can switch, big latus rectum, its characterized in that: including nest of tubes sliding sleeve structure (1) and switch fishing device (2), nest of tubes sliding sleeve structure (1) includes joint (3), the right-hand member outside and urceolus (4) of joint (3) cup joint, the outside of urceolus (4) is equipped with jet orifice (5), the inside slidable mounting of urceolus (4) has outer sliding sleeve (6), the inboard of outer sliding sleeve (6) is equipped with interior sliding sleeve structure, interior sliding sleeve structure includes salvage head (8), the inboard of salvage head (8) is equipped with ball seat (9) and first interior sawtooth section (10), the inboard fixedly connected with of right-hand member of salvage head (8) inner locking pipeline (11), the outside of interior locking pipeline (11) is equipped with sawtooth ring mounting groove (12), the outside of interior locking pipeline (11) is located sawtooth ring mounting groove (12) and is equipped with outer sawtooth ring (13), the outside cover of interior locking pipeline (11) is equipped with positioning sleeve (14), the left end of positioning sleeve (14) is equipped with elasticity split (15), the inboard (16) of elastic split (15) is equipped with protruding (16), the outside (19) are equipped with the inside of the inside locking pipeline (19) and accomodate recess (18), the right side of the outer cylinder (4) is provided with a joint connecting part (20), and the inner side of the outer sliding sleeve (6) is provided with a switch matching groove (21).

2. The throttled ball fracturing sleeve with draggable, switchable and large drift diameter of claim 1, wherein: the left end of the sawtooth ring mounting groove (12) is a forty-five degree inclined plane, and the left side surface of the outer sawtooth ring (13) is a forty-five degree inclined plane.

3. The throttled ball fracturing sleeve with draggable, switchable and large drift diameter of claim 1, wherein: the outside of outer sliding sleeve (6) is equipped with first seal groove (22), the outside of salvaging head (8) is equipped with second seal groove (23), the inboard of salvaging head (8) is equipped with third seal groove (24), the inside of first seal groove (22), second seal groove (23) and third seal groove (24) all is equipped with sealing washer (25).

4. The throttled ball fracturing sleeve with draggable, switchable and large drift diameter of claim 1, wherein: a gasket (26) is arranged between the outer cylinder (4) and the outer sliding sleeve (6), a first shearing pin (27) is arranged on the gasket (26) in a screwed connection mode, the first shearing pin (27) is connected with the outer sliding sleeve (6), and a second shearing pin (28) is connected between the positioning sleeve (14) and the inner locking pipeline (11).

5. The throttled ball fracturing sleeve with draggable, switchable and large drift diameter of claim 1, wherein: the inner side of the outer cylinder (4) is provided with a first positioning groove (29) and a second positioning groove (30), the outer side of the outer sliding sleeve (6) is provided with a positioning ring (31), and the outer side of the positioning ring (31) is provided with a positioning convex ring (32).

6. The throttled ball fracturing sleeve with draggable, switchable and large drift diameter of claim 1, wherein: the switch salvaging device (2) comprises a base (33), a pipeline connecting seat (34) is arranged at the left end of the base (33), a salvaging connecting seat (35) is arranged at the right end of the base (33), an outer sawtooth elastic split (36) is arranged at the right end of the salvaging connecting seat (35), an inner telescopic cavity (37) communicated with the outer part is arranged inside the base (33), and a switch limiting block (38) is slidably arranged in the telescopic cavity (37).

7. The throttled ball fracturing sleeve with draggable, switchable and large drift diameter of claim 6, wherein: the inside of base (33) is installed first pneumatic cylinder (39), the piston rod end of first pneumatic cylinder (39) is connected with holding ring (40).

8. The throttled ball fracturing sleeve with draggable, switchable and large diameter of claim 7, wherein: the inside of base (33) is equipped with second pneumatic cylinder (41), the (41) piston rod of second pneumatic cylinder rotates with first bull stick (42) to be connected, the other end of first bull stick (42) rotates with second bull stick (43) to be connected, the other end of second bull stick (43) rotates with the inner wall of base (33) to be connected, the junction of first bull stick (42) and second bull stick (43) rotates with rotation connecting seat (44) on switch stopper (38) to be connected.