CN215408568U - Core-pulling type drags for and bores multi-functional bridging plug - Google Patents

Abstract

The utility model provides a core-pulling type fishing and drilling multifunctional bridge plug, which comprises: the device comprises an upper joint, an inner piston, an outer piston, an inner unsealing pipe, an outer unsealing pipe, a setting anchor assembly and a lower joint; the outer part of the lower end of the upper joint is connected with a cylinder sleeve, and the inner part of the lower end of the upper joint is connected with a central pipe; the inner piston is sleeved on the central tube, an anti-blocking block is arranged between the inner piston and the upper joint, the lower end of the inner piston is connected with a push cylinder, the lower end of the push cylinder is connected with a connecting sleeve, and the lower end of the connecting sleeve is connected with a lock sleeve; the outer piston is sleeved between the inner piston and the cylinder sleeve, and a starting nail is arranged between the outer piston and the inner piston; the inner deblocking pipe is sleeved on the central pipe, and the upper end of the inner deblocking pipe is connected with a fishing head through external threads; an unsealing nail is arranged between the outer unsealing pipe and the inner unsealing pipe, a locking ring seat is connected to the outer unsealing pipe, and the locking ring seat is hooked on the inner side of the lock sleeve through a locking ring; the setting anchoring component is sleeved on the outer deblocking pipe, the upper end of the setting anchoring component is connected with the lock sleeve, and the lower end of the setting anchoring component is connected with the outer deblocking pipe; the lower joint is connected at the lower end of the central tube.

Description

Core-pulling type drags for and bores multi-functional bridging plug

Technical Field

The utility model relates to the field of oil well production isolation equipment, in particular to a core-pulling type fishing and drilling multifunctional bridge plug.

Background

With the advancement of oil well exploitation, part of oil production wells are exposed to water or flooded, the working condition of a shaft is gradually worsened, the workload of water control and oil production is gradually increased, and the current common scheme of the oil field is that a production string is produced by separating production with a separation packer and temporarily plugging a lower bridge plug. For the temporary plugging scheme of the conventional bridge plug, under the complex horizontal well shaft condition, the following defects exist: 1. when a conventional bridge plug is left in a well for a long time, the slips are adhered to the cone in a scaling manner, so that fishing is blocked, and underground accidents are easily caused; 2. when the conventional bridge plug is stuck during fishing, even if a fishing tool is successfully withdrawn, a plurality of well fittings are reserved, and great workload and difficulty are brought to milling and stuck releasing; 3. when the drillable bridge plug is used, the bridge plug cannot be fished, and the bridge plug must be unlocked by milling, so that the workload is large; 4. the whole bridge plug can be drilled and a well is reserved, and the difficulty of milling and releasing the clamp is still very high in a highly deviated well and a horizontal well.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide a multi-functional bridge plug of the core-pulling type, retrievable and drillable, which overcomes the above-mentioned problems or at least partially solves or alleviates them.

The utility model provides a core-pulling type fishing and drilling multifunctional bridge plug, which comprises:

the outer part of the lower end of the upper joint is connected with a cylinder sleeve, the inner part of the lower end of the upper joint is connected with a central pipe, and a bridging channel is arranged between the inner side of the upper part of the upper joint and the inner side of the lower end of the upper joint;

the inner piston is sleeved on the outer side of the central tube in a sliding mode, the upper end of the inner piston faces the lower port of the bridging channel, an anti-blocking locking block is arranged between the inner piston and the lower end of the upper connector, the outer side of the lower end of the inner piston is connected with a push cylinder in a threaded mode, the lower end of the push cylinder is split and provided with an inner hook, a connecting sleeve is connected through the inner hook, the lower end of the connecting sleeve is connected with a lock sleeve, and the inner side of the lock sleeve is provided with upper inclined teeth;

the outer piston is sleeved between the inner piston and the cylinder sleeve in a sliding mode, the upper end of the outer piston faces to the upper end opening of the bridging channel, and a starting nail is arranged between the outer piston and the inner piston;

the inner deblocking pipe is sleeved at the middle lower part of the central pipe, an outer step is arranged on the outer side of the lower part of the inner deblocking pipe, and the upper end of the inner deblocking pipe is connected with a fishing head through external threads;

the lower end of the outer unsealing pipe is provided with an unsealing nail, the middle of the outer unsealing pipe is provided with an inner step, the inner step is opposite to the outer step, the upper end of the outer unsealing pipe is split and is connected with a lock ring seat through threads, a lock ring is arranged on the lock ring seat, the outer side of the lock ring is provided with lower oblique teeth, and the lower oblique teeth are hooked on upper oblique teeth on the inner side of the lock sleeve;

the setting anchoring component is sleeved on the outer unsealing pipe, the upper end of the setting anchoring component is connected with the lock sleeve, and the lower end of the setting anchoring component is connected with the lower end of the outer unsealing pipe;

the lower joint is connected to the lower end of the central pipe, and a releasing nail is arranged between the lower joint and the central pipe.

The utility model also has the following optional features.

Optionally, the setting anchor assembly comprises:

the rubber cylinder seat is sleeved on the outer unsealing pipe in a sliding mode, an upper pressing cap, a first rubber cylinder, a spacer ring, a second rubber cylinder, a lower pressing cap and an upper cone are sequentially sleeved on the rubber cylinder seat from top to bottom, the upper portion of the upper pressing cap is connected with the lower end of the lock sleeve through threads, the lower portion of the upper pressing cap is connected with the upper end of the rubber cylinder seat, and the lower pressing cap is connected with the upper cone;

the lower cone is fixed at the lower part of the outer unsealing pipe;

slips located between the upper cone and the lower cone.

Optionally, the lower end of the lower pressing cap is slidably sleeved on the upper end of the upper cone, and an overload nail is arranged between the lower pressing cap and the upper cone.

Optionally, the slip is a sleeve-type slip, a plurality of cutting slits are arranged between two ends of the slip in a staggered manner, barbs are respectively arranged on the inner sides of the two ends of the slip, and barbs are also arranged at the lower end of the upper cone and the upper end of the lower cone.

Optionally, the lower cone is slidably sleeved on the lower portion of the outer unsealing pipe, a release locking block is arranged on the outer unsealing pipe at the lower end of the lower cone, the inner end of the release locking block abuts against the inner unsealing pipe, and the outer end of the release locking block extends out of the outer unsealing pipe.

Optionally, the lower end of the lower cone is further connected with a combining cap, and the combining cap surrounds the outer side of the release lock block.

Optionally, the upper portion of the connecting sleeve is provided with an inner hook, the connecting sleeve is hooked with the lower end of the push cylinder through the inner hook, a necking step is arranged on the inner side of the connecting sleeve, and the necking step is abutted to the upper end of the lock sleeve.

Optionally, an outer edge step is arranged on the outer side of the inner end of the fishing head, the outer edge step is opposite to the necking step on the connecting sleeve, and when the fishing head moves upwards, the outer edge step is hooked on the necking step.

Optionally, the lower part of the outer unsealing pipe is provided with an outer limiting step, and the outer limiting step is over against the lower end of the rubber barrel seat.

The core-pulling type salvaging and drilling multifunctional bridge plug has multiple functions of plugging the bridge plug, hanging the bridge plug, inserting the pipe bridge plug and the like, is provided with an overload protection mechanism, can fish out most bridge plug accessories in a core-pulling mode when the bridge plug is salvaged and overloaded when stuck, enables well-reserved accessories to be minimum, has two functions of retrievability and drilling, and can simplify the deblocking work under the condition of good working condition of a sleeve.

Drawings

FIG. 1 is a schematic view of the overall structure of the multi-functional plug of the present invention;

FIG. 2 is a schematic structural view of the multi-functional core-pulling fishing drillable bridge plug of FIG. 1 after setting and releasing;

FIG. 3 is a schematic structural view of the multi-functional plug of FIG. 2 when it is being salvaged and unsealed;

fig. 4 is a schematic structural diagram of the multifunctional loose core type fishing drillable bridge plug in fig. 3 during core-pulling fishing.

In the above figures: 1, connecting a joint; 101 bridging the channel; 2, cylinder sleeve; 3, a central tube; 4 an inner piston; 5, an anti-blocking block; 6, pushing a barrel; 601, hooking outside; 7, connecting sleeves; 701, hooking inside; 702 a necking step; 8, locking a sleeve; 9 an outer piston; 10 starting the nail; 11, unsealing the pipe inside; 1101 an outer step; 12 fishing head; 1201 outer edge step; 13 unsealing the tube; 1301 inner steps; 1302 an outer limit step; 14 unsealing the nail; 15 lock ring seat; 16 a locking ring; 17 a lower joint; 18, releasing the nail; 19 a rubber cylinder seat; 20, pressing a cap; 21 a first rubber cylinder; 22 spacer rings; 23 a second rubber cylinder; 24 pressing down the cap; 25, an upper cone; 26 a lower cone; 27 slips; 28 overload nails; 29 releasing the locking block; 30 and a cap.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

Example 1

Referring to fig. 1, an embodiment of the present invention provides a multi-functional bridge plug capable of being dragged and drilled, including: the device comprises an upper joint 1, an inner piston 4, an outer piston 9, an inner unsealing pipe 11, an outer unsealing pipe 13, a setting anchor assembly and a lower joint 17; the cylinder sleeve 2 is connected to the outer part of the lower end of the upper joint 1, the central pipe 3 is connected to the inner part of the lower end of the upper joint 1, and a bridging channel 101 is arranged between the inner side of the upper part and the inner side of the lower end of the upper joint 1; the inner piston 4 is slidably sleeved on the outer side of the central tube 3, the upper end of the inner piston faces the lower port of the bridging channel 101, an anti-blocking locking block 5 is arranged between the inner piston 4 and the lower end of the upper connector 1, the outer side of the lower end of the inner piston 4 is in threaded connection with a push cylinder 6, the lower end of the push cylinder 6 is split and provided with an outer hook 601, the outer hook 601 is connected with a connecting sleeve 7 through the outer hook 601, the lower end of the connecting sleeve 7 is connected with a locking sleeve 8, and the inner side of the locking sleeve 8 is provided with upper oblique teeth; the outer piston 9 is slidably sleeved between the inner piston 4 and the cylinder sleeve 8, the upper end of the outer piston faces the upper port of the bridging channel 101, and a starting nail 10 is arranged between the outer piston 9 and the inner piston 8; the inner deblocking pipe 11 is sleeved at the middle lower part of the central pipe 3, the outer side of the lower part of the inner deblocking pipe 11 is provided with an outer step 1101, and the upper end of the inner deblocking pipe is connected with a fishing head 12 through external threads; an unsealing nail 14 is arranged between the lower part of the outer unsealing pipe 13 and the inner unsealing pipe 11, an inner step 1301 is arranged in the middle of the outer unsealing pipe 13, the inner step 1301 is opposite to the outer step 1101, the upper end of the outer unsealing pipe 13 is split and is connected with a lock ring seat 15 through threads, a lock ring 16 is arranged on the lock ring seat 15, lower oblique teeth are arranged on the outer side of the lock ring 16, and the lower oblique teeth are hooked on upper oblique teeth on the inner side of the lock sleeve 8; the setting anchoring component is sleeved on the outer unsealing pipe 13, the upper end of the setting anchoring component is connected with the lock sleeve 8, and the lower end of the setting anchoring component is connected with the lower end of the outer unsealing pipe 13; the lower joint 17 is connected at the lower end of the central tube 3, and a releasing pin 18 is arranged between the lower joint 17 and the central tube 3.

Referring to fig. 2, when hydraulic setting is performed, high-pressure fluid is pumped into the central tube 3 through an oil tube, high pressure in the inner cavity of the central tube 3 acts on the outer piston 9 through the bridging channel 101, when the pressure is high enough, the starting nail 10 is cut off, the outer piston 9 moves downwards to release the anti-blocking block 5, constraint on the inner piston 4 is released, the outer piston 9 and the inner piston 4 move downwards synchronously under the action of the internal high pressure, the push cylinder 6, the connecting sleeve 7, the lock sleeve 8, the setting anchoring component and the outer unsealing tube 13 are pushed to move downwards in sequence, and after the setting anchoring component is set, the releasing nail 18 is cut off to release pressure. The lock sleeve 8 and the lock ring 16 are meshed through the upper helical teeth and the lower helical teeth which are one-way teeth, so that the lock sleeve 8 cannot reset after setting and releasing. Because the lock ring seat 15 and the outer deblocking pipe 13 are in split threaded connection and are both controlled by the inner deblocking pipe 11, the influence of the upper and lower pressure difference on the inner deblocking pipe 11 is small, so that the setting and anchoring state of the setting anchor assembly can be maintained when no external force is applied, and the setting anchor assembly cannot reset even if the setting internal pressure disappears.

Referring to fig. 3, during normal fishing, a special fishing tool is used to capture the fishing head 12, the fishing head 12 is lifted up, the inner deblocking pipe 11 in threaded connection therewith goes upward to shear the deblocking nail 14, the fishing head 12 and the inner deblocking pipe 11 continue to go upward, the connecting sleeve 7, the lock sleeve 8, the setting anchoring component and the inner deblocking pipe 11 are sequentially driven by the outer edge step 1201 of the fishing head 12 to go upward to reset, and all or part of the bridge plug can be taken out.

Example 2

Referring to fig. 1, on the basis of example 1, a setting anchor assembly comprises: the rubber cylinder seat 19, the lower cone 26 and the slips; the rubber cylinder seat 19 is sleeved on the outer unsealing pipe 13 in a sliding manner, an upper pressing cap 20, a first rubber cylinder 21, a spacer ring 22, a second rubber cylinder 23, a lower pressing cap 24 and an upper cone 25 are sequentially sleeved on the rubber cylinder seat 19 from top to bottom, the upper part of the upper pressing cap 20 is connected with the lower end of the lock sleeve 8 through threads, the lower part of the upper pressing cap 20 is connected with the upper end of the rubber cylinder seat 19, and the lower pressing cap 24 is connected with the upper cone 25; the lower cone 26 is fixed at the lower part of the outer unsealing tube 13; slips 27 are located between the upper cone 25 and the lower cone 26.

Referring to fig. 4, during core-pulling fishing, a fishing tool is used to capture the fishing head 12, the fishing head 12 is lifted, the inner deblocking pipe 11 in threaded connection therewith goes upward to shear the deblocking nail 14, the fishing head 12 and the inner deblocking pipe 11 go upward continuously, the connecting sleeve 7, the lock sleeve 8, the upper pressing cap 20, the first rubber barrel 21, the spacer ring 22, the second rubber barrel 23, the inner deblocking pipe 11 and the lower pressing cap 24 are sequentially driven by the outer edge step 12 of the fishing head 12 to go upward to reset, if the separation strength of the cone slip is higher than the shear strength of the overload nail 28, the overload nail 28 is sheared, the core-pulling type self-locking sealing module is taken out as a whole, and the small-diameter tail pipe connected with the outer deblocking pipe 13 and the lower joint 17 is also taken out of the wellbore through the upper cone 25, the slip 27 and the lower cone 26 along with the lower joint 17; only the upper cone 25, the slips 27, the lower cone 26 and the combining cap 30 are left in the well bore, so that the workload of subsequent milling and deblocking is greatly simplified, and the milling difficulty is reduced.

Example 3

Referring to fig. 1, on the basis of embodiment 2, the lower end of the lower pressing cap 24 is slidably sleeved on the upper end of the upper cone 25, and an overload nail 28 is arranged between the lower pressing cap 24 and the upper cone 25.

When core-pulling fishing is carried out, when the connecting sleeve 7, the locking sleeve 8, the upper pressing cap 20, the first rubber cylinder 21, the spacer ring 22, the second rubber cylinder 23, the inner deblocking pipe 11 and the lower pressing cap 24 are sequentially driven by the outer edge step 12 of the fishing head 12 to go upwards and reset, if the separation strength of the cone slip is higher than the shearing strength of the overload nail 28, the overload nail 28 is cut off, the connecting sleeve 7, the locking sleeve 8, the upper pressing cap 20, the first rubber cylinder 21, the spacer ring 22, the second rubber cylinder 23, the inner deblocking pipe 11 and the lower pressing cap 24 are taken out, the small-diameter tail pipe connected with the outer deblocking pipe 13 and the lower pressing head 17 also penetrates through the upper cone 25, the slip 27 and the lower cone 26 to be taken out of the shaft along with the lower pressing head 17, and only the upper cone 25, the slip 27, the lower cone 26 and the combining cap 30 are left in the shaft, so that the workload of subsequent milling deblocking is greatly simplified and the milling difficulty is reduced.

Example 4

Referring to fig. 1, 2, 3 and 4, in example 2, the slip 27 is a sleeve-type slip, a plurality of slits are alternately arranged between two ends of the slip, barbs are respectively arranged on the inner sides of the two ends of the slip 27, and barbs are also arranged on the lower end of the upper cone 25 and the upper end of the lower cone 26.

If the cone slip separation strength is lower than the shear strength of the overload pin 28, the overload pin 28 will not be sheared, the lower pressing cap 24 pulls the upper cone 25 upward through the overload pin 28, the upper cone 25 pulls the barb on the inner side of the upper end of the slip 27 through the barb, the slip 27 pulls the barb on the upper end of the lower cone 26 through the barb on the lower end, and the upper pressing cap 30 is taken out together with the lower pressing cap.

Example 5

Referring to fig. 1, 2, 3 and 4, on the basis of embodiment 2, the lower cone 26 is slidably sleeved on the lower part of the outer unsealing tube 13, the outer unsealing tube 13 at the lower end of the lower cone 26 is provided with a release lock block 29, the inner end of the release lock block 29 is abutted against the inner unsealing tube 11, and the outer end extends out of the outer unsealing tube 13.

When the inner unsealing pipe 11 goes upwards, the inner support for releasing the locking block 29 is lost, the locking block connection between the lower cone 26 and the outer unsealing pipe 13 is released, and at this time, the inner step 1301 on the outer unsealing pipe 13 is hooked by the outer step 1101 on the inner unsealing pipe 11 and taken away upwards.

Example 6

Referring to fig. 1, 2, 3 and 4, in embodiment 5, a combining cap 30 is further connected to the lower end of the lower cone 26, and the cap 30 surrounds the outside of the release lock 29.

And the cap 30 is sleeved on the outer unsealing pipe 13, the upper end of the cap is in threaded connection with the lower end of the lower cone 26, and the locking block 29 is clamped between the cap 30 and the lower cone 26, so that the lower cone 26 is fixed at the lower end of the outer unsealing pipe 13.

Example 7

Referring to fig. 1 and 2, on the basis of embodiment 1, an inner hook 701 is provided at the upper portion of the connection sleeve 7, and is hooked with the lower end of the push cylinder 6 through the inner hook 701, a necking step 702 is provided at the inner side of the connection sleeve 7, and the necking step 702 is pressed against the upper end of the lock sleeve 8.

The connecting sleeve 7 is hooked with the outer hook 601 on the push cylinder 6 through the inner hook 701, and when the push cylinder 6 is separated from the cylinder sleeve 2 on the outer side of the push cylinder, the hooking between the inner hook 701 and the outer hook 601 can be separated from the hooking due to the deformation of the inner hook 701; when the fishing head 12 goes upward, the outer edge step 1201 hooks the necking step 702 of the connecting sleeve 7 to drive the fishing head to go upward.

Example 8

Referring to fig. 1, on the basis of embodiment 1, an outer edge step 1201 is arranged on the outer side of the inner end of the fishing head 12, the outer edge step 1201 is opposite to the necking step 702 on the connecting sleeve 7, and when the fishing head 12 moves upwards, the outer edge step 1201 hooks on the necking step 702.

When the fishing head 12 is fished and moved upwards, the outer edge step 1201 hooks the necking step 702, and drives the lock sleeve 8, the upper pressing cap 20, the first rubber cylinder 21, the spacer ring 22, the second rubber cylinder 23 and the lower pressing cap 24 which are directly or indirectly connected with the connecting sleeve 7 to move upwards, so that all the components are fished.

Example 9

Referring to fig. 1, on the basis of embodiment 1, the lower portion of the outer unsealing tube 13 is provided with an outer limit step 1302, and the outer limit step 1302 faces the lower end of the glue cylinder seat 19.

When setting, the rubber tube base 19 can slide downwards along the outer unsealing tube 13, and drive the upper pressing cap 20 to move downwards and extrude the first rubber tube 21, the second rubber tube 23, the lower pressing cap 24 and the upper cone 25, and the outer limiting step 1302 at the lower part of the outer unsealing tube 13 can prevent the rubber tube base 19 from continuing to move downwards, limit the rubber tube base 19, and avoid excessive extrusion.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims (9)

1. The utility model provides a multi-functional bridging plug of core pulling formula salvageable drillable which characterized in that includes:

the device comprises an upper connector (1), wherein a cylinder sleeve (2) is connected to the outer part of the lower end of the upper connector (1), a central pipe (3) is connected to the inner part of the lower end of the upper connector (1), and a bridging channel (101) is arranged between the inner side of the upper part of the upper connector (1) and the inner side of the lower end of the upper connector;

the inner piston (4) is sleeved on the outer side of the central tube (3) in a sliding mode, the upper end of the inner piston (4) faces the lower port of the bridging channel (101), an anti-blocking locking block (5) is arranged between the inner piston (4) and the lower end of the upper connector (1), the outer side of the lower end of the inner piston (4) is connected with a push cylinder (6) in a threaded mode, the lower end of the push cylinder (6) is split and provided with an outer hook (601), the lower end of the push cylinder is connected with a connecting sleeve (7) through the outer hook (601), the lower end of the connecting sleeve (7) is connected with a lock sleeve (8), and the inner side of the lock sleeve (8) is provided with upper oblique teeth;

the outer piston (9) is sleeved between the inner piston (4) and the lock sleeve (8) in a sliding mode, the upper end of the outer piston (9) faces the upper port of the bridging channel (101), and a starting nail (10) is arranged between the outer piston (9) and the inner piston (4);

the inner unsealing pipe (11) is sleeved at the middle lower part of the central pipe (3), an outer step (1101) is arranged on the outer side of the lower part of the inner unsealing pipe (11), and the upper end of the inner unsealing pipe is connected with a fishing head (12) through external threads;

an outer unsealing pipe (13), an unsealing nail (14) is arranged between the lower part of the outer unsealing pipe (13) and the inner unsealing pipe (11), an inner step (1301) is arranged in the middle of the outer unsealing pipe (13), the inner step (1301) is opposite to the outer step (1101), the upper end of the outer unsealing pipe (13) is split and is connected with a lock ring seat (15) through threads, a lock ring (16) is arranged on the lock ring seat (15), lower oblique teeth are arranged on the outer side of the lock ring (16), and the lower oblique teeth are hooked on upper oblique teeth on the inner side of the lock sleeve (8);

the setting anchor component is sleeved on the outer unsealing pipe (13), the upper end of the setting anchor component is connected with the lock sleeve (8), and the lower end of the setting anchor component is connected with the lower end of the outer unsealing pipe (13);

the lower joint (17) is connected to the lower end of the central pipe (3), and a releasing nail (18) is arranged between the lower joint (17) and the central pipe (3).

2. The coring fishable drillable multifunctional bridge plug of claim 1, wherein the setting anchor assembly comprises:

the rubber barrel seat (19) is slidably sleeved on the outer unsealing pipe (13), an upper pressing cap (20), a first rubber barrel (21), a spacer ring (22), a second rubber barrel (23), a lower pressing cap (24) and an upper cone (25) are sequentially sleeved on the rubber barrel seat (19) from top to bottom, the upper part of the upper pressing cap (20) is connected with the lower end of the lock sleeve (8) through threads, the lower part of the upper pressing cap (20) is connected with the upper end of the rubber barrel seat (19), and the lower pressing cap (24) is connected with the upper cone (25);

the lower cone (26), the said lower cone (26) is fixed on the inferior part of the said outer deblocking pipe (13);

slips (27), the slips (27) being located between the upper cone (25) and the lower cone (26).

3. The multi-functional bridge plug of the core-pulling type salvageable drillable according to claim 2, characterized in that the lower end of the lower pressing cap (24) is slidably sleeved on the upper end of the upper cone (25), and an overload nail (28) is arranged between the lower pressing cap (24) and the upper cone (25).

4. The multi-functional bridge plug of claim 2, wherein the slip (27) is a sleeve-type slip, a plurality of slits are alternately arranged between two ends of the slip, barbs are respectively arranged on the inner sides of the two ends of the slip (27), and barbs are also arranged on the lower end of the upper cone (25) and the upper end of the lower cone (26).

5. The multi-functional bridge plug of claim 2, wherein the lower cone (26) is slidably fitted over the lower portion of the outer unsealing tube (13), and a release lock (29) is provided on the outer unsealing tube (13) at the lower end of the lower cone (26), the inner end of the release lock (29) abuts against the inner unsealing tube (11), and the outer end extends out of the outer unsealing tube (13).

6. The multi-functional bridge plug of the core-pulling type salvageable drillable according to claim 5, characterized in that a combining cap (30) is further connected to the lower end of the lower cone (26), and the combining cap (30) surrounds the outside of the release lock block (29).

7. The multi-functional bridge plug of the core-pulling type salvageable drillable according to claim 1, characterized in that the upper part of the connecting sleeve (7) is provided with an inner hook (701) and is hooked with the lower end of the push cylinder (6) through the inner hook (701), the inner side of the connecting sleeve (7) is provided with a necking step (702), and the necking step (702) is pressed against the upper end of the lock sleeve (8).

8. The multifunctional bridge plug of claim 7, wherein an outer edge step (1201) is arranged on the outer side of the inner end of the fishing head (12), the outer edge step (1201) is opposite to the necking step (702) on the connecting sleeve (7), and when the fishing head (12) moves upwards, the outer edge step (1201) is hooked on the necking step (702).

9. The multi-functional bridge plug of the core-pulling type salvageable drillable according to claim 2, characterized in that the lower part of the outer unsealing pipe (13) is provided with an outer limit step (1302), and the outer limit step (1302) is opposite to the lower end of the rubber cylinder seat (19).

Images