CN210087293U

CN210087293U - Throwing type soluble bridge plug and well cementation sliding sleeve matched with bridge plug for use

Info

Publication number: CN210087293U
Application number: CN201920599440.1U
Authority: CN
Inventors: 李一村; 陈辰; 樊祥意; 樊慧梅
Original assignee: Tianjin Matrix Technology Co Ltd
Current assignee: Tianjin Matrix Technology Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-02-18
Anticipated expiration: 2029-04-28

Abstract

The utility model provides a well cementation sliding sleeve that soluble bridging plug of type of throwing and cooperation bridging plug used relates to oil exploration technical field, has solved among the prior art technical problem that the bridging plug needs the later stage to bore except that and the easy sand card of well cementation sliding sleeve. The sealing device comprises an upper joint and a lower joint, wherein a sealing assembly is sleeved on the outer side of the upper joint; a pumping leather cup I and a guide shoe are sequentially sleeved on the outer side of the lower joint from top to bottom; still include the stopping subassembly, the both ends of stopping subassembly are connected with top connection, lower clutch respectively. The utility model is used for in the oil exploration.

Description

Throwing type soluble bridge plug and well cementation sliding sleeve matched with bridge plug for use

Technical Field

The utility model belongs to the technical field of the oil exploration technique and specifically relates to a well cementation sliding sleeve that soluble bridging plug of type of throwing and cooperation bridging plug used is related to.

Background

With the fact that the problems of thin reservoir, low pressure, low permeability, high water content, unbalanced storage and production and the like are increasingly highlighted in the middle and later stages of development of domestic oil fields, oil layers of the thin and poor oil and gas fields are dispersed, interlayer spans are disordered, and the common fracturing technology cannot meet the requirement of efficient production. In recent years, a fracturing bridge plug and a well cementation sliding sleeve fracturing process become core methods for solving the problem.

The technology of bridge plug clustering perforation combined-staged fracturing is widely used at present, and has the advantages of one-time pipe column operation, no staged limitation, simple tool pipe column structure, smooth shaft and the like. As one of the important tools for staged fracturing, bridge plugs are increasingly used. At present, conventional bridge plugs include drillable bridge plugs, large-bore bridge plugs, and the like; the drillable bridge plug needs to be drilled and ground by a drilling tool after fracturing is finished; in the far end of the horizontal well or the ultra-long horizontal well, the drilling and grinding efficiency is low.

Casing cementing sliding sleeve staged fracturing is a novel reservoir transformation technology, and the process principle is as follows: according to the condition of a hydrocarbon reservoir producing zone, after the placement position of the fracturing sliding sleeve is determined, a plurality of fracturing sliding sleeves and sleeves aiming at different producing zones are put into a well once according to the determined depth, then conventional well cementation is implemented, and each layer of sliding sleeve is opened step by step through a specific mode to perform the fracturing of the producing zone. The technology adopts the well cementation fracturing sliding sleeve and is matched with a hydraulic or mechanical switching tool, so that the well cementation fracturing sliding sleeve can be used for increasing production and transformation of unconventional oil and gas reservoirs such as low-permeability oil and gas reservoirs, thin oil layers, shale gas, coal bed gas and the like, and can also be used as an effective means for exploiting and plugging bottom water in a stratum during production of an oil and gas well, but the conventional well cementation sliding sleeve has the problems of small drift diameter, easiness in sand blocking, risk in an opening mode and the like.

The applicant has found that the prior art has at least the following technical problems:

1. the technical problem that bridge plugs in the prior art need to be drilled and removed later is solved;

2. the well cementation sliding sleeve in the prior art has the technical problem of easy sand blocking.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a well cementation sliding sleeve that soluble bridging plug of type of throwing and cooperation bridging plug used to the bridging plug that exists needs the later stage to bore the technical problem who removes and the easy sand card of well cementation sliding sleeve among the solution prior art. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a throwing type soluble bridge plug, which comprises an upper joint and a lower joint; a sealing assembly is further sleeved on the outer side of the upper joint; a pumping leather cup I and a guide shoe are sequentially sleeved on the outer side of the lower joint from top to bottom;

the anti-back assembly is also included; the retaining assembly comprises a retaining ring and a retaining back ring; the anti-backing ring is sleeved on the upper joint, a one-way locking structure I is arranged between the anti-backing ring and the upper joint, and a one-way locking structure II is arranged between the anti-backing ring and the anti-backing back ring; the lower adapter is sleeved outside the backstop back ring; the locking directions of the first unidirectional locking structure and the second unidirectional locking structure are both the directions which are along the axial direction of the central tube and far away from the guide shoe; a setting boss matched with the upper joint is arranged on the inner side of the backstop back ring;

a plurality of sleeving lugs are circumferentially arranged on the outer side of the guide shoe, a first gap is formed between every two adjacent sleeving lugs, and a first guide tip is arranged at the lower end of each sleeving lug;

the upper joint, the lower joint, the sealing assembly, the first pumping leather cup, the guide shoe and the retaining assembly are all made of soluble materials.

Optionally or preferably, a first sleeving part is arranged at the upper part of the sleeving lug, and the width of the first sleeving part is gradually increased along the direction from the lower end to the upper end of the first sleeving part.

Optionally or preferably, the included angle between the two side edges of the first socket joint part and the vertical direction is 5-6 degrees.

Optionally or preferably, a leather cup back ring and a pumping leather cup II are sequentially sleeved on the outer side of the backstop back ring from top to bottom; the lower end of the pumping leather cup II is connected with the upper end of the lower connector; and a leather cup protecting ring is sleeved outside the joint of the lower end of the pumping leather cup II and the upper end of the lower joint.

Optionally or preferably, the lower end of the leather cup protection ring is sleeved outside the upper end of the pumping leather cup, and the guide shoe is sleeved outside the lower end of the pumping leather cup; the lower end of the packing cup back ring is sleeved on the outer side of the upper end of the pumping packing cup II.

Optionally or preferably, the sealing assembly comprises a rubber tube, an inner back ring and an outer back ring assembly which are sequentially sleeved outside the upper joint from top to bottom; wherein,

the contact surfaces of the outer back ring assembly, the inner back ring and the backstop component are inclined surfaces; when the outer back ring assembly is pressed by force, the outer back ring assembly can be pressed radially towards the upper connector, and the outer back ring assembly can slide out along the inclined plane.

Optionally or preferably, the sealing assembly further comprises a rubber tube inner ring sleeved outside the upper joint, and the rubber tube inner ring is arranged inside the rubber tube.

Optionally or preferably, the lower end of the backstop back ring is in threaded connection with the upper end of the lower connector, the upper end of the backstop back ring is connected with the lower end of the upper connector through a shear pin, and an O-shaped sealing ring is arranged on the connection side of the backstop back ring and the upper connector.

Optionally or preferably, the packing cup back ring, the pumping packing cup II and the O-shaped sealing ring are all made of soluble materials.

The utility model provides a well cementation sliding sleeve, which comprises an outer sleeve and an inner sleeve, wherein the inner diameter of the inner sleeve is matched with the outer diameter of the throwing type soluble bridge plug; the inner wall of the inner sleeve is provided with a guide body;

the guide body comprises a plurality of sleeved inner bulges which are circumferentially arranged, a gap II is formed between every two adjacent sleeved inner bulges, the shape and the number of the sleeved inner bulges are matched with those of sleeved lugs on the throwing type soluble bridge plug, and the upper ends of the sleeved inner bulges are provided with guide tip parts II;

when the throwing type soluble bridge plug is sleeved in the inner sleeve, the sleeved inner bulges are all inserted in the first gap between the two adjacent sleeved lugs.

Based on the technical scheme, the embodiment of the utility model provides a can produce following technological effect at least:

(1) the utility model provides a throwing type soluble bridge plug, because top connection, lower clutch, seal assembly, pump sending leather cup one, guide shoe and stopping subassembly are made by dissoluble material, after fracturing is accomplished, the utility model provides a throwing type bridge plug can dissolve by oneself, can be fine after dissolving realize very big latus rectum, exempt from to bore simultaneously and remove, exempt from to salvage, reduced earlier stage equipment and later stage and bored the cost of grinding, make things convenient for going into of later stage operation instrument; the method can realize the transformation process of completing all fracturing by one trip of the tubular column, and solves the technical problem of drilling and removing in the later period.

(2) The utility model provides a well cementation sliding sleeve, at the in-process of fracturing construction, the overcoat can prevent well cementation in-process cement effectively to the jam in punching the hole, has reduced the gravel and has got into the inside risk of well cementation sliding sleeve, has solved the technical problem of the easy sand card of well cementation sliding sleeve.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of embodiment 1 of the present invention;

fig. 2 is a sectional view of embodiment 1 of the present invention;

fig. 3 is a sectional view of embodiment 2 of the present invention;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3;

fig. 5 is a schematic view of the internal structure of the inner sleeve in embodiment 2 of the present invention;

fig. 6 is a schematic view of the use state of embodiment 1 and embodiment 2 of the present invention;

fig. 7 is a schematic diagram showing the classification of the inner sleeve in embodiment 2 of the present invention;

fig. 8 is a schematic view of the interlocking of the guiding body and the female ear in

embodiments

1 and 2 of the present invention.

In the figure: 1. an upper joint; 2. a lower joint; 3. pumping a leather cup I; 4. guiding a shoe; 5. a check ring; 6. a backstop back ring; 7. setting the boss; 8. a leather cup back ring; 9. pumping a leather cup II; 10. a leather cup protecting ring; 11. a rubber cylinder; 12. recessing; 13. an inner dorsal loop; 14. a first back ring; 15. a second dorsal ring; 16. an inner ring of the rubber cylinder; 17. an O-shaped sealing ring; 18. shearing the pin; 19. a protrusion; 20. a one-way locking thread I; 21. a one-way locking thread II; 22. a jacket; 23. an inner sleeve; 24. a guide body; 25. the inner bulge is sleeved; 26. a first gap; 27. A second gap; 28. a first guiding tip; 29. a second guiding tip; 30. a first flow interception surface; 31. a second flow intercepting surface; 32. a third flow intercepting surface; 33. a lug is sleeved; 34. a ball; 35. a first sleeve joint part; 36. a second sleeve joint part; 37. A long hole; 38. a first connector; 39. a second joint; 40. c type stopping structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1-8:

example 1:

the utility model provides a throwing type soluble bridge plug, which comprises an upper joint 1 and a lower joint 2; a sealing component is further sleeved on the outer side of the upper joint 1; a pumping leather cup I3 and a guide shoe 4 are sequentially sleeved on the outer side of the lower joint 2 from top to bottom;

the anti-blocking device further comprises a stopping component, wherein two ends of the stopping component are respectively connected with the upper joint 1 and the lower joint 2; the retaining assembly comprises a retaining ring 5 and a retaining back ring 6; the anti-backing ring 5 is sleeved on the upper joint 1, a one-way locking structure I is arranged between the anti-backing ring 5 and the upper joint 1, and a one-way locking structure II is arranged between the anti-backing ring 5 and the anti-backing back ring 6; the lower joint 2 is sleeved outside the backstop back ring 6; the locking directions of the first unidirectional locking structure and the second unidirectional locking structure are both the directions which are along the axial direction of the central tube and far away from the guide shoe 4; a setting boss 7 matched with the upper joint 1 is arranged on the inner side of the backstop back ring 6;

a plurality of sleeving lugs 33 are circumferentially arranged on the outer side of the guide shoe 4, a gap I26 is formed between every two adjacent sleeving lugs 33, and a guide tip I28 is arranged at the lower end of each sleeving lug 33;

the upper joint 1, the lower joint 2, the sealing assembly, the pumping leather cup I3, the guide shoe 4 and the retaining assembly are all made of soluble materials.

The utility model provides a throwing type soluble bridging plug, because top connection 1, lower clutch 2, seal assembly, pump sending leather cup 3, guide shoe 4 and stopping subassembly are made by dissolvable material, after fracturing is accomplished, the utility model provides a throwing type bridging plug can dissolve by oneself, can be fine after dissolving realize very big latus rectum, exempt from to bore simultaneously and remove, exempt from to salvage, reduced earlier stage equipment and later stage and bored and ground into the cost, make things convenient for going into of later stage operation instrument; the method can realize the transformation process of completing all fracturing by one trip of the tubular column, and solves the technical problem of drilling and removing in the later period.

As an alternative embodiment, the upper portion of the engaging lug 33 is provided with a first engaging portion 35, and the width of the first engaging portion 35 gradually increases along the direction from the lower end to the upper end thereof.

As an alternative embodiment, the angle a between the two side edges of the first socket part 35 and the vertical direction is 5-6 °.

As an optional implementation mode, a leather cup back ring 8 and a pumping leather cup second 9 are sequentially sleeved on the outer side of the backstop back ring 6 from top to bottom; the lower end of the pumping leather cup II 9 is connected with the upper end of the lower connector 2; and a leather cup protecting ring 10 is sleeved outside the joint of the lower end of the pumping leather cup II 9 and the upper end of the lower connector 2.

As an optional implementation mode, the lower end of the leather cup protection ring 10 is sleeved outside the upper end of the pumping leather cup I3, and the guide shoe 4 is sleeved outside the lower end of the pumping leather cup I3.

As an optional implementation mode, the lower end of the cup back ring 8 is sleeved outside the upper end of the second pumping cup 9.

As an optional implementation manner, the sealing assembly comprises a rubber tube 11, an inner back ring 13 and an outer back ring assembly which are sleeved outside the upper joint 1 in sequence from top to bottom; wherein,

the contact surfaces of the outer back ring assembly, the inner back ring 13 and the backstop component are inclined planes; when the outer back ring assembly is pressed by force, the outer back ring assembly can be pressed radially towards the upper connector 1, and the outer back ring assembly can slide out along the inclined surface.

As an alternative embodiment, the outer back ring assembly includes a first back ring 14 and a second back ring 15 which are symmetrically arranged, and the first back ring 14 and the second back ring 15 are movably connected.

As an optional embodiment, the sealing assembly further includes a rubber tube inner ring 16 sleeved outside the upper joint 1, and the rubber tube inner ring 16 is disposed inside the rubber tube 11.

As an optional embodiment, the lower end of the retaining back ring 6 is in threaded connection with the upper end of the lower joint 2, the upper end of the retaining back ring 6 is connected with the lower end of the upper joint 1 through a shear pin 18, and the retaining back ring 6 is provided with an O-shaped sealing ring 17 on the connecting side with the upper joint 1.

As an alternative embodiment, both the upper and lower ends of the rubber tube 11 are provided with recesses 12, and the upper joint 1 and the inner back ring 13 are respectively provided with protrusions 19 matching with the recesses 12.

As an alternative embodiment, the one-way locking structure one is a one-way locking thread one 20 which is arranged on the contact surfaces of the anti-return ring 5 and the upper joint 1 and is matched with each other; the second unidirectional locking structure is a second unidirectional locking thread 21 which is arranged on the contact surface of the backstop ring 5 and the backstop back ring 6 and is matched with the backstop back ring.

As an alternative embodiment, the material of the engaging lug 33 is high-strength steel, which can play a good role in wear resistance and impact resistance during the pumping process.

In the embodiment, the upper joint 1, the lower joint 2, the pumping leather cup I3, the guide shoe 4 and the retaining assembly are all made of soluble magnesium alloy materials sold by Mattery technologies, Inc. of Tianjin, and the specific performance parameters of the soluble magnesium alloy materials are shown in the following table 1; of course, the soluble magnesium alloy material may be produced by other manufacturers as long as the performance parameters of table 1 below are satisfied.

The sealing component is made of soluble polyurethane rubber, and the polyurethane rubber contains a large amount of molecules which are sensitive to water and can be hydrolyzed into molecules with small molecular weight. Macroscopic manifestations are that the seal assembly swells earlier, decreases in elasticity, and then degrades loosely into tiny particles.

TABLE 1 soluble magnesium alloy material performance parameter table

Performance items	Detection method and standard	Standard value
			Density of		1.8-1.83g/cm³
Tensile strength	GB/T228.1-2010	≥300MPa
			Permanent set in tension	GB/T228.1-2010	≥5％
Tensile yield strength	GB/T228.1-2010	≥200MPa
			Hardness HB	GB/T231.1-2009	≥85

Example 2:

the utility model provides a sliding sleeve, including overcoat 22 and endotheca 23, be equipped with slot hole 37 on the overcoat 22 and be used for the fracturing, be equipped with joint one 38, endotheca 23, joint two 39 along its length direction in proper order in the overcoat 22, the internal diameter of endotheca 23 with the external diameter phase-match of throwing type soluble bridging plug in above-mentioned embodiment 1; a guide body 24 is arranged on the inner wall of the inner sleeve 23;

the guide bodies 24 respectively comprise a plurality of sleeve inner bulges 25 which are circumferentially arranged, a gap II 27 is formed between every two adjacent sleeve inner bulges 25, the shapes and the number of the sleeve inner bulges 25 are matched with the shapes and the number of the sleeve lugs 33 on the throwing type soluble bridge plug in the embodiment 1, and the upper ends of the sleeve inner bulges 25 are provided with guide tip parts II 29;

when the throw-type soluble bridge plug is sleeved in the inner sleeve 23 as described in embodiment 1 above, each of the sleeved inner protrusions 25 is inserted into the gap one 26 between two adjacent sleeved lugs 33.

In an alternative embodiment, a C-shaped retaining structure 40 is arranged between the inner sleeve 23 and the outer sleeve 22.

As an optional embodiment, the upper end of the sleeve inner protrusion 25 is a second sleeve part 36, and the width of the second sleeve part 36 gradually decreases along the direction from the lower end to the upper end thereof.

As an alternative embodiment, the included angle b between the two side edges of the second socket part 36 and the vertical direction is 5-6 ° (i.e. matching with the first socket part 35, which is convenient for construction).

As an optional embodiment, the whole guide body 24 is of a streamline design, and the end part of the guide body is rounded, so that the well cementation rubber plug can be well protected, and the rubber plug can more effectively scrape off cement residues.

In the practical use of the throwing type soluble bridge plug and the well cementation sliding sleeve, the well cementation sliding sleeve in the embodiment 2 is matched with the throwing type soluble bridge plug in the embodiment 1 for use;

the setting distance between two adjacent groups of guide bodies 24 on the well cementation sliding sleeve is adapted to the length of the throwing type soluble bridge plug in the embodiment 1; and along the direction from the upper end to the lower end of the outer sleeve 22, the second gaps 27 between the sleeving inner bulges 25 on the multiple groups of guide bodies 24 are from large to small;

in particular use, the nesting lugs 33 on each throwable soluble bridge plug of example 1 each mate with the second gap 27 of a corresponding set of guides 24, respectively; specifically, the sleeving lugs 33 are divided into a plurality of grades according to the size, the guiding bodies 24 of different grades are matched with the sleeving lugs 33 of different sizes, when the well cementation sliding sleeve is prefabricated in the previous period, the inner sleeve 23 with the second smallest gap 27 is located at the lowest side of the well cementation sliding sleeve, and then the inner sleeve 23 is prefabricated sequentially from bottom to top according to the sequence that the second gap 27 is gradually increased.

The utility model provides a casting type soluble bridge plug and well cementation sliding sleeve's working process does:

(1) prefabricating a bridge plug in an earlier stage, and prefabricating a well cementation sliding sleeve in a well:

bridge plug: prefabricating a plurality of bridge plugs as required, wherein gaps I26 between the sleeving lugs 33 on the bridge plugs are gradually decreased from large to small according to the throwing sequence of the bridge plugs (as the gaps I26 are gradually decreased, the sleeving lugs 33 are divided into a plurality of grades according to the size of the gaps I26);

well cementation sliding sleeve: prefabricating a plurality of well cementation sliding sleeves as required, wherein the second gaps 27 between the sleeving inner bulges 25 on the guide bodies 24 of the inner sleeves 23 are gradually reduced from large to small along the direction from the upper end to the lower end of the outer sleeve 22 (as the second gaps 27 are gradually reduced from large to small, the sleeving inner bulges 25 are also classified into a plurality of grades according to the size of the second gaps 27, and each bridge plug is matched with one well cementation sliding sleeve);

(2) when the well cementation sliding sleeve needs to be opened, a plurality of throwing type soluble bridge plugs in the embodiment 1 of the utility model are put in from the well mouth in sequence (the putting-in sequence is put in according to the sequence of the matching between the sleeve lug 33 and the gap II 27), the first pumping leather cup 3 and the second pumping leather cup 9 can both increase the acting force of fluid on the throwing type bridge plugs, so that the throwing type bridge plugs move forward smoothly until reaching the preset throwing position and interacting with the guide body 24 matched with the throwing type bridge plugs;

since the nesting lugs 33 are classified into a plurality of grades according to the size, and the nesting lugs 33 with different size grades have nesting inner protrusions 25 (guide bodies 24) with different grades to match with the nesting inner protrusions, under the action of hydraulic pumping, the nesting lugs 33 sequentially pass through each upper guide body 24 and finally interact with the guide body 24 matched with the nesting lugs; when the guiding body 24 matched with the guiding body is reached, the included angle a between the two side edges of the first sleeve part 35 and the vertical direction is 5-6 degrees, the included angle b between the two side edges of the second sleeve part 36 and the vertical direction is 5-6 degrees, the sleeve joint lug 33 and the sleeve joint inner bulge 25 can interact to form interlocking (as shown in figure 8, the direction of an arrow c in figure 8 is the direction of throwing the bridge plug), and the interlocking is formed, so that the interlocking cannot be separated due to hydraulic action, the interlocking is remained in the well, and the residual in the well in the later period can be effectively prevented.

(3) When the throwing bridge plug reaches a designated position, the discharge capacity is continuously increased, when the pumping discharge capacity reaches a certain degree, a large flow-intercepting pressure difference is generated by three flow-intercepting surfaces (a first pumping leather cup 3, a first flow-intercepting surface 30 and a second flow-intercepting surface 31 at a second pumping leather cup 9, and a third flow-intercepting surface 32 generated between a sleeve joint lug 33 and a guide body 24), a pressing ball 34 on the throwing bridge plug is located on an upper connector 1, a cutting pin 18 is cut off, a rubber cylinder 11 is compressed, an upper back ring and a lower back ring are unfolded, a stopping structure is formed between the stopping ring 5 and the upper connector 1, the stopping ring 5 and the stopping back ring form a stopping structure, and finally the upper connector 1 is located on a setting boss 7 in the stopping back ring to realize setting.

(4) Continuing to press, opening the inner sleeve 23 of the well cementation sliding sleeve, moving the inner sleeve 23 downwards to a position where the inner sleeve 23 is in contact with the lower joint 2, exposing the long hole 37 of the outer sleeve 22 to perform fracturing, and arranging a C-shaped backstop structure 40 between the inner sleeve 23 and the outer sleeve 22 of the well cementation sliding sleeve to prevent the inner sleeve 23 from moving upwards and closing, wherein after the fracturing is completed, the thrown throwing type soluble bridge plug can be gradually dissolved to form a large through diameter, and as the sleeving lugs 33 are insoluble materials, in the early stage of setting, self-locking is formed between the sleeving lugs 33 and the guide body 24, so that the interference of the sleeving lugs 33 on a lowering tool in the later stage of construction operation is effectively avoided, great convenience is provided, and the cost of manpower and material resources is also; and, the utility model provides a drop into and the seat of throwing type soluble bridging plug only need the water conservancy pump sending can, need not to use other running-in instruments, can save manpower and material resources cost.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.

Claims

1. A throwable soluble bridge plug, comprising: comprises an upper joint and a lower joint; a sealing assembly is further sleeved on the outer side of the upper joint; a pumping leather cup I and a guide shoe are sequentially sleeved on the outer side of the lower joint from top to bottom;

2. A tossable soluble bridge plug according to claim 1, wherein: the upper part of the sleeving lug is provided with a first sleeving part, and the width of the first sleeving part is gradually increased along the direction from the lower end to the upper end of the first sleeving part.

3. A tossable soluble bridge plug according to claim 2, wherein: the included angle between the two side edges of the first sleeving part and the vertical direction is 5-6 degrees.

4. A tossable soluble bridge plug according to claim 3, wherein: a leather cup back ring and a pumping leather cup II are sequentially sleeved on the outer side of the backstop back ring from top to bottom; the lower end of the pumping leather cup II is connected with the upper end of the lower connector; and a leather cup protecting ring is sleeved outside the joint of the lower end of the pumping leather cup II and the upper end of the lower joint.

5. A tossable soluble bridge plug according to claim 4, wherein: the lower end of the leather cup protection ring is sleeved outside the upper end of the pumping leather cup, and the guide shoe is sleeved outside the lower end of the pumping leather cup; the lower end of the packing cup back ring is sleeved on the outer side of the upper end of the pumping packing cup II.

6. A tossable soluble bridge plug according to any one of claims 4 to 5, wherein: the sealing assembly comprises a rubber cylinder, an inner back ring and an outer back ring assembly which are sequentially sleeved on the outer side of the upper joint from top to bottom; wherein,

7. A tossable soluble bridge plug according to claim 6, wherein: the sealing assembly further comprises a rubber cylinder inner ring sleeved on the outer side of the upper joint, and the rubber cylinder inner ring is arranged on the inner side of the rubber cylinder.

8. A tossable soluble bridge plug according to claim 7, wherein: the lower end of the stopping back ring is in threaded connection with the upper end of the lower connector, the upper end of the stopping back ring is connected with the lower end of the upper connector through a shearing pin, and an O-shaped sealing ring is arranged on the side, connected with the upper connector, of the stopping back ring.

9. A tossable soluble bridge plug according to claim 8, wherein: the packing cup back ring, the pumping packing cup II and the O-shaped sealing ring are all made of soluble materials.

10. A well cementation sliding sleeve which is characterized in that: comprising an outer sleeve and an inner sleeve, wherein the inner diameter of the inner sleeve is matched with the outer diameter of the throwing type soluble bridge plug in any one of the claims 1-9; the inner wall of the inner sleeve is provided with a guide body;

the guide body comprises a plurality of sleeve inner bulges which are circumferentially arranged, a gap II is formed between every two adjacent sleeve inner bulges, the shapes and the number of the sleeve inner bulges are matched with those of the sleeve lugs on the throwing soluble bridge plug in any one of claims 1 to 9, and the upper ends of the sleeve inner bulges are provided with guide tip parts II;

when a toss soluble bridge plug according to any of claims 1-9 is placed in the inner sleeve, the nesting protrusions are each inserted into the gap one between two adjacent nesting lugs.