Lifting type bridge plug device capable of being drilled, milled and deblocked

Abstract

The utility model provides a lifting type bridge plug device capable of being drilled, milled and deblocked, and belongs to the technical field of oil well sealing bridge plugs. The device comprises a delivery mechanism and a bridge plug, the delivery mechanism comprises a delivery outer cylinder, a pressing sleeve, an upper pull rod, a lower pull rod and a clamping jaw, the bridge plug comprises a rubber cylinder liner tube and a pull rod, the pull rod is sleeved with the rubber cylinder liner tube, the outer wall of the rubber cylinder liner tube is sleeved with a rubber cylinder, and the upper end and the lower end of the rubber cylinder liner tube are provided with a locking clamping tooth and a lower end respectively. An upper anchor tooth and a lower anchor tooth are arranged at the bottom of the locking clamping tooth and the top of the lower end respectively, the upper end and the lower end of the rubber sleeve are connected with the upper anchor tooth and the lower anchor tooth in a matched mode through cones respectively, and a clamping head matched with the clamping jaw is arranged at the top of the pull rod. The hydraulic setting bridge plug is mainly used for sealing an oil well, and solves the problems that an existing hydraulic setting bridge plug needs accurate pressure control and a complex ground control system, operation is complex, and maintenance cost is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil well plugging bridge plugs, and particularly relates to a drillable and millable release type bridge plug device that can be lifted and lowered. Background Art

[0002] In oil well operations, a bridge plug is a tool used to block a specific position in the wellbore for operations such as layered fracturing, acidizing, or other downhole operations. The main function of the bridge plug is to create a temporary or permanent barrier in the wellbore to isolate different well sections, allowing independent operations at different horizons. For old and abandoned wells, the bridge plug can be used to seal the well for a long time. The anchoring, setting, and releasing of the bridge plug are key steps in its operation process. In the prior art, most bridge plugs use hydraulic methods to achieve the anchoring, setting, and releasing processes of the bridge plug. However, hydraulic setting requires precise pressure control and a complex ground control system. If the pressure is too high or too low, it may cause the bridge plug to fail to be properly positioned or have poor sealing, and the operation is complex with high maintenance costs. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a drillable and millable release type bridge plug device to solve the problems that the existing hydraulic setting bridge plug requires precise pressure control and a complex ground control system, and has complex operation and high maintenance costs.

[0004] To achieve the above object, the utility model adopts the following technical solutions: A drillable and millable release type bridge plug device, which includes a delivery mechanism and a bridge plug. The delivery mechanism includes a delivery outer tube, a pressure sleeve, an upper pull rod, a lower pull rod, and a claw. The lower pull rod is arranged at the bottom of the upper pull rod and is connected to the upper pull rod. A claw is arranged at the bottom of the lower pull rod. The delivery outer tube is slidably sleeved outside the upper pull rod and is connected to the upper pull rod in a matching manner. The pressure sleeve is arranged below the delivery outer tube and is sleeved outside the lower pull rod. The bridge plug includes a rubber barrel liner and a pull rod. The rubber barrel liner is sleeved outside the pull rod. A rubber barrel is sleeved on the outer wall of the rubber barrel liner. Locking teeth and a lower end head are respectively arranged at the upper and lower ends of the rubber barrel liner. Upper anchor teeth and lower anchor teeth are respectively arranged at the bottom of the locking teeth and the top of the lower end head. Both upper and lower ends of the rubber barrel are respectively connected to the upper anchor teeth and the lower anchor teeth through cones in a matching manner. A connection head that cooperates with the claw is arranged at the top of the pull rod. The bottom of the pressure sleeve is connected to the top of the locking teeth in a matching manner.

[0005] Furthermore, the upper pull rod and the lower pull rod are connected through a middle joint.

[0006] Furthermore, a pressure-limiting shear pin is connected between the bottom of the pull rod and the lower end head.

[0007] Further, a limiting sliding groove is formed on the inner wall of the lower half of the outer delivery cylinder. A guiding body is slidably sleeved on the upper pull rod. A reversing sleeve is slidably sleeved on the guiding body. A reversing groove is arranged on the guiding body. A plurality of reversing keys matched with the reversing groove are arranged on the reversing sleeve. The outer wall of the reversing sleeve is slidably matched with the limiting sliding groove.

[0008] Further, a directional key is arranged at the bottom of the limiting sliding groove. A guiding groove matched with the directional key is formed on the outer side of the reversing sleeve. A directional groove is arranged on the outer wall of the guiding body. The directional key is slidably matched with the directional groove.

[0009] Further, a friction mechanism is connected to the bottom of the guiding body. The friction mechanism includes a friction block main body, a friction block, a friction block protective sleeve and a plurality of friction block springs. The upper half of the friction block protective sleeve is screwed to the bottom of the guiding body. The lower half of the friction block protective sleeve is screwed to the friction block main body. The friction block main body is sleeved on the outer side of the lower pull rod. The friction block is sleeved on the outer side of the friction block main body. A plurality of friction block springs are arranged between the inner wall of the friction block and the friction block main body.

[0010] Further, the top end of the friction block is in limiting cooperation with the bottom of the friction block protective sleeve, and the bottom end of the friction block is in limiting cooperation with the friction block main body.

[0011] Further, an anchoring mechanism is arranged at the bottom of the friction block main body. The anchoring mechanism includes an upper cone, a lower cone and an anchor tooth frame. The top of the upper cone is screwed to the bottom of the friction block main body. The top of the anchor tooth frame is sleeved on the bottom of the upper cone. The bottom of the anchor tooth frame is sleeved on the top of the lower cone. The bottom of the lower cone is screwed to the pressure sleeve. Anchor teeth are arranged on the outer wall of the anchor tooth frame. A hoop spring is sleeved on the anchor tooth frame.

[0012] Further, a claw frame is arranged at the bottom end of the lower pull rod. The claw is connected to the claw frame through a claw pin. A claw leaf spring is arranged between the claw and the claw frame.

[0013] Further, the material of the locking jaw is ductile iron, and the materials of the lower end head, the cone, the upper anchor tooth and the lower anchor tooth are all gray cast iron materials.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The utility model provides a drillable, millable, releasable and retrievable bridge plug device, which is provided with a delivery mechanism. By lifting and lowering the delivery mechanism, mechanical anchoring, setting and releasing of the bridge plug are realized. Compared with the traditional hydraulic setting, the operation is simple and the maintenance cost is low.

[0016] 2. Through the structural arrangement of the bridge plug in the present utility model, and the materials selected for the main structures such as the lower end head, cone, upper anchor teeth, and lower anchor teeth of the bridge plug are all HT10-26 gray cast iron materials with low hardness and easy to drill and mill, and the material of the locking dog teeth is QT45-0 ductile iron with low hardness, which is much lower than the hardness of the hard alloy drill and mill tools for machining. They all belong to easily machinable metal materials. When it is necessary to release the anchor of the bridge plug, the drill and mill cutting tool can be lowered into the well without being affected by casing sand plugging, and the bridge plug tool can be safely and quickly released from the anchor. The operation is safe and reliable, and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of the delivery mechanism in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0019] Figure 2 is a schematic diagram of the overall structure of the bridge plug in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0020] Figure 3 is a schematic diagram of the structure of the delivery outer cylinder in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0021] Figure 4 is a schematic diagram of the structure of the guide body in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0022] Figure 5 is an unfolded schematic diagram of the reversing groove of the guide body in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0023] Figure 6 is a top view schematic diagram of the structure of the reversing sleeve in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0024] Figure 7 is a partial structure schematic diagram of the delivery mechanism in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0025] Figure 8 is a partial structure schematic diagram of the delivery mechanism in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0026] Figure 9 is a connection schematic diagram of the delivery mechanism and the bridge plug in a drillable and millable release and lifting type bridge plug device according to the present utility model;

[0027] Figure 10 This is a schematic view of the releasing of a drillable and millable retrievable bridge plug device according to the present utility model.

[0028] 1 - Delivery outer cylinder, 2 - Upper pull rod, 3 - Guide body, 4 - Reversing sleeve, 5 - Orientation key, 6 - Middle joint, 7 - Friction block protective sleeve, 8 - Friction block main body, 9 - Friction block, 10 - Friction block spring, 11 - Upper cone, 12 - Anchor tooth frame, 13 - Anchor tooth, 14 - Hoop spring, 15 - Lower cone, 16 - Pressure sleeve, 17 - Lower pull rod, 18 - Claw holder, 19 - Claw leaf spring, 20 - Claw, 21 - Claw pin, 22 - Connector, 23 - Locking jaw, 24 - Upper anchor tooth, 25 - Cone, 26 - Pull rod, 27 - Rubber barrel liner, 28 - Rubber barrel, 29 - Lower anchor tooth, 30 - Lower end head, 31 - Pressure limiting shear pin, 32 - Reversing key, 33 - Reversing groove, 34 - Limit sliding groove, 35 - Guide groove, 36 - Orientation groove. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other. The described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0030] See Figures 1 - 10 In this embodiment, a drillable and millable retrievable bridge plug device includes a delivery mechanism and a bridge plug. The delivery mechanism includes a delivery outer cylinder 1, a pressure sleeve 16, an upper pull rod 2, a lower pull rod 17, and a claw 20. The lower pull rod 17 is arranged at the bottom of the upper pull rod 2 and connected to the upper pull rod 2. A claw 20 is arranged at the bottom of the lower pull rod 17. The delivery outer cylinder 1 is slidably sleeved outside the upper pull rod 2 and is connected to the upper pull rod 2 in a matching manner. The pressure sleeve 16 is arranged below the delivery outer cylinder 1 and sleeved outside the lower pull rod 17. The bridge plug includes a rubber barrel liner 27 and a pull rod 26. The rubber barrel liner 27 is sleeved outside the pull rod 26. A rubber barrel 28 is sleeved on the outer wall of the rubber barrel liner 27. A locking jaw 23 and a lower end head 30 are respectively arranged at the upper and lower ends of the rubber barrel liner 27. An upper anchor tooth 24 and a lower anchor tooth 29 are respectively arranged at the bottom of the locking jaw 23 and the top of the lower end head 30. The upper and lower ends of the rubber barrel 28 are respectively connected to the upper anchor tooth 24 and the lower anchor tooth 29 through a cone 25 in a matching manner. A connector 22 that cooperates with the claw 20 is arranged at the top of the pull rod 26. The bottom of the pressure sleeve 16 is connected to the top of the locking jaw 23 in a matching manner. In this embodiment, a delivery mechanism is provided. By lifting and lowering the delivery mechanism, the mechanical anchoring, setting, and releasing of the bridge plug are realized. Compared with the traditional hydraulic setting, the operation is simple and the maintenance cost is low.

[0031] In this embodiment, the upper pull rod 2 and the lower pull rod 17 are connected by a middle joint 6. The middle joint 6 is screwed to both the upper pull rod 2 and the lower pull rod 17 and is used to connect the upper pull rod 2 and the lower pull rod 17.

[0032] In this embodiment, a pressure-limiting shear pin 31 is connected between the bottom of the pull rod 26 and the lower end head 30. The pressure-limiting shear pin 31 is used for connecting the pull rod 26 and the lower end head 30, is horizontally installed in the outer circumferential hole of the lower end head 30, and connects the lower end head 30 and the pull rod 26. When the upward pulling force on the pull rod 26 is greater than 7 tons, the pressure-limiting shear pin 31 is cut off, so that the pull rod 26 is separated from the lower end head 30, thereby realizing the separation between the pull rod 26 and the bridge plug.

[0033] In this embodiment, a limiting sliding groove 34 is provided on the inner wall of the lower half of the delivery outer cylinder 1. A guide body 3 is slidably sleeved on the upper pull rod 2. A reversing sleeve 4 is slidably sleeved on the guide body 3. A reversing groove 33 is provided on the guide body 3. A plurality of reversing keys 32 that cooperate with the reversing groove 33 are provided on the reversing sleeve 4. The outer wall of the reversing sleeve 4 is slidably matched with the limiting sliding groove 34. A positioning key 5 is provided at the bottom of the limiting sliding groove 34. A guide groove 35 that cooperates with the positioning key 5 is provided on the outside of the reversing sleeve 4. As Figure 5 shown, 12 reversing grooves 33 are evenly spaced on the guide body 3, and the included angle between two adjacent reversing grooves 33 is 30°. As Figure 6 shown, when the reversing key 32 on the reversing sleeve 4 slides upward, it cooperates with the reversing groove 33 to realize the reversing of the reversing sleeve 4, so that the guide groove 34 on the reversing sleeve 4 turns to the positioning key 5, thereby realizing the docking between the positioning key 5 and the guide groove 34. In this embodiment, the reversing sleeve 4 needs to be lifted and lowered six times, that is, the reversing sleeve 4 needs to be reversed six times to realize the docking between the positioning key 5 and the guide groove 34.

[0034] In this embodiment, a positioning groove 36 is provided on the outer wall of the guide body 3. The positioning key 5 is slidably matched with the positioning groove 36. The positioning key 5 passes through the positioning groove 36 on the guide body 3 and abuts against the upper pull rod 2, thereby lifting the upper pull rod 2.

[0035] In this embodiment, a friction mechanism is connected to the bottom of the guide body 3. The friction mechanism includes a friction block main body 8, a friction block 9, a friction block protective sleeve 7, and a plurality of friction block springs 10. The upper half of the friction block protective sleeve 7 is screwed to the bottom of the guide body 3, and the lower half of the friction block protective sleeve 7 is screwed to the friction block main body 8. The friction block main body 8 is sleeved outside the lower pull rod 17, and the friction block 9 is sleeved outside the friction block main body 8. A plurality of friction block springs 10 are arranged between the inner wall of the friction block 9 and the friction block main body 8. The friction block 9 is clamped in the outer groove of the friction block main body 8 by the friction block protective sleeve 7. The friction block 9 generates friction between the outer wall of the sleeve and the pipe wall by the tension of the friction block spring 10 outward in the sleeve, so as to keep the delivery tool assembly hovering in the sleeve.

[0036] In this embodiment, the top end of the friction block 9 is in limit fit with the bottom of the friction block protective sleeve 7, and the bottom end of the friction block 9 is in limit fit with the friction block main body 8. Through the limit fit between the bottom of the friction block protective sleeve 7 and the friction block main body 8 on the friction block 9, the friction block 9 is always clamped in the outer groove of the friction block main body 8.

[0037] In this embodiment, an anchoring mechanism is arranged at the bottom of the friction block main body 8. The anchoring mechanism includes an upper cone 11, a lower cone 15, and an anchor tooth frame 12. The top of the upper cone 11 is screwed to the bottom of the friction block main body 8. The top of the anchor tooth frame 12 is sleeved on the bottom of the upper cone 11. The bottom of the anchor tooth frame 12 is sleeved on the top of the lower cone 15. The bottom of the lower cone 15 is screwed to the pressure sleeve 16. Anchor teeth 13 are arranged on the outer wall of the anchor tooth frame 12. A hoop spring 14 is sleeved on the anchor tooth frame 12. When the upper cone 11 and the lower cone 15 are used to lift the delivery outer cylinder 1, due to the compression support force of the bridge plug, the anchor tooth frame 12 expands, so that the anchor teeth 13 on the anchor tooth frame 12 are anchored to the inner wall of the casing. After the hoop spring 14 is connected in a circular shape, it is sleeved in the outer grooves of the anchor tooth frame 12 and the anchor teeth 13, and the anchor teeth 13 are tightly clamped by the elastic force and do not expand outward without external force.

[0038] In this embodiment, a claw frame 18 is arranged at the bottom end of the lower pull rod 17. The claw 20 is connected to the claw frame 18 through a claw pin 21. A claw leaf spring 19 is arranged between the claw 20 and the claw frame 18. The upper end of the claw leaf spring 19 is installed in the outer circular groove of the claw frame 18 through a screw, and the lower end of the claw leaf spring presses on the back of the claw 20. The claw 20 is installed in the groove of the claw frame 18 through the claw pin 21. The claw 20 is used for clamping with the pull rod 26.

[0039] In this embodiment, the locking teeth 23 are made of ductile iron, and the lower end head 30, the cone 25, the upper anchoring teeth 24 and the lower anchoring teeth 29 are all made of gray cast iron. After the oil well is perforated, it is not immediately exploited. For oil wells that need to be exploited after a long time, the well plug may not be smoothly released due to sand plugging. In this embodiment, the main structures such as the lower end head 30, the cone 25, the upper anchoring teeth 24 and the lower anchoring teeth 29 of the plug are made of HT10-26 gray cast iron with low hardness and easy to be drilled and milled. The locking teeth 23 are made of QT45-0 ductile iron with low hardness, and the hardness is much lower than that of the hard alloy drilling and milling tools for machining. They all belong to easily machinable metal materials. When the plug needs to be released, the drilling and milling cutting tool can be lowered into the well without being affected by the casing sand plug, and the plug can be safely and quickly released. The operation is safe and reliable, and the production efficiency is improved.

[0040] In this embodiment, when the drilling and milling release operation is carried out, the drill pipe is connected to the conventional oilfield drilling and milling device and lowered into the well. After the drilling and milling tool contacts the upper part of the plug, the drill pipe is rotated, and the drilling and milling tool rotates to drill and mill the plug body until the plug is completely drilled through, and the drilling and milling release operation is completed.

[0041] During operation, the delivery outer cylinder 1 is lifted. As the delivery outer cylinder 1 rises, the orientation key 5 at the bottom of the delivery outer cylinder 1 rises. When the orientation key 5 rises to the reversing sleeve 4, the top end of the orientation key 5 abuts against the bottom end face of the reversing sleeve 4 and drives the reversing sleeve 4 to slide upward in the reversing groove 33. After lifting and lowering 6 times, when the reversing sleeve 4 realizes reversing in the reversing groove 33, the guiding groove 35 on the reversing sleeve 4 rotates to the orientation key 5. At this time, the orientation key 5 rises and passes through the reversing sleeve 4 through the guiding groove 35 and continues to rise. After passing through the orientation groove 36 on the guiding body 3, it abuts against the upper pull rod 2, and provides a pulling force to the lower pull rod 17 through the upper pull rod 2. At this time, the plug is gradually compressed under the pulling force of the lower pull rod 17 and tightly abuts against the pressure sleeve 16 of the delivery mechanism, and drives the pressure sleeve 16 to move upward, so that the lower cone 15 and the upper cone 11 expand the anchoring tooth frame 12. The anchoring teeth 13 on the anchoring tooth frame 12 are anchored on the casing wall, and the rubber cylinder 28 of the plug is compressed and sealed on the inner wall of the casing. The upper anchoring teeth 24 and the lower anchoring teeth 29 of the plug are tension-anchored on the inner wall of the casing under the action of the cone 25 at this time. When the upward pulling force on the pull rod 26 of the plug is greater than 7 tons, the pressure-limiting shear pin 31 between the pull rod 26 and the lower end head 30 breaks, the pull rod 26 is separated from the lower end head 30, and then the pull rod 26 is separated from the plug through the delivery mechanism, realizing the release of the plug after sealing and anchoring in the casing.

[0042] In the shooting-plugging-shooting combined operation process of oil well perforation, when shooting first and then plugging in the combined operation, after the perforating gun perforates, the plug is used to seal the well at the upper part of the perforation section. When plugging first and then shooting in the combined operation, the plug is used to seal the well at the lower part of the perforation section, and then the perforating gun perforation operation is carried out. The plug seals the well between the two perforation sections and separates the two perforation sections.

[0043] When the combined operation of perforation and plugging is carried out in this embodiment, it includes the following steps:

[0044] Step 1: Connect the assembly of the delivery mechanism and the bridge plug to the lower end of the perforating gun through the delivery mechanism, and lower the well with the perforating gun to the designed hole depth section;

[0045] Step 2: After the perforating gun perforates, lift the perforating gun to a position above the perforation section;

[0046] Step 3: Lift and lower the perforating gun 6 times. After the lifting tension of the perforating gun is greater than 7 tons, the bridge plug is set, anchored and released;

[0047] Step 4: Lift the perforating gun, lift the delivery mechanism out of the wellhead, and the combined operation of perforation and plugging is completed.

[0048] When the combined operation of plugging and perforation is carried out in this embodiment, it includes the following steps:

[0049] Step 1: Connect the assembly of the delivery mechanism and the bridge plug to the lower end of the perforating gun through the delivery mechanism, and lower the well with the perforating gun to a position below the designed well depth;

[0050] Step 2: Lift and lower the perforating gun 6 times. After the lifting tension of the perforating gun is greater than 7 tons, the bridge plug is set, anchored and released;

[0051] Step 3: Lift the perforating gun to the designed well depth, ignite and detonate the perforating gun to perforate;

[0052] Step 4: Lift the perforating gun, and the delivery mechanism is lifted out of the wellhead with the perforating gun, and the combined operation of plugging and perforation is completed.

[0053] The embodiments of the present utility model disclosed above are only used to help explain the present utility model. The embodiments do not describe all the details in detail, nor limit the present utility model to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can understand and utilize the present utility model well.

Claims

1. A drillable, millable, unsealed and liftable bridge plug device, characterized in that: It comprises a delivery mechanism and a bridge plug, wherein the delivery mechanism comprises a delivery outer cylinder (1), a pressure sleeve (16), an upper pull rod (2), a lower pull rod (17) and a claw (20), wherein the lower pull rod (17) is arranged at the bottom of the upper pull rod (2) and is connected to the upper pull rod (2), and a claw (20) is arranged at the bottom of the lower pull rod (17), wherein the delivery outer cylinder (1) is slidably sleeved on the outside of the upper pull rod (2) and is cooperatively connected to the upper pull rod (2), wherein the pressure sleeve (16) is arranged below the delivery outer cylinder (1) and sleeved on the outside of the lower pull rod (17), and wherein the bridge plug comprises a rubber sleeve liner (27) and a pull rod (26), wherein the rubber sleeve liner (27) is sleeved on the pull rod The outer wall of the rubber sleeve liner (27) is provided with a rubber sleeve (28), and the upper and lower ends of the rubber sleeve liner (27) are respectively provided with locking teeth (23) and a lower end head (30), and the bottom of the locking teeth (23) and the top of the lower end head (30) are respectively provided with upper anchor teeth (24) and lower anchor teeth (29), and the upper and lower ends of the rubber sleeve (28) are respectively connected with the upper anchor teeth (24) and the lower anchor teeth (29) through cones (25), and the top of the pull rod (26) is provided with a clamping joint (22) that cooperates with the claw (20), and the bottom of the pressing sleeve (16) is connected with the top of the locking teeth (23).

2. The drillable, millable, unsealed and liftable bridge plug device according to claim 1, characterized in that: The upper pull rod (2) and the lower pull rod (17) are connected via a middle joint (6).

3. The drillable, millable, unsealed and liftable bridge plug device according to claim 1, characterized in that: A pressure-limiting shear nail (31) is connected between the bottom of the pull rod (26) and the lower end (30).

4. The drillable, millable, unsealed and liftable bridge plug device according to claim 1, characterized in that: A limited sliding groove (34) is provided on the inner wall of the lower half of the delivery outer cylinder (1); a guide body (3) is provided on the sliding sleeve of the upper pull rod (2); a reversing sleeve (4) is connected to the sliding sleeve of the guide body (3); a reversing groove (33) is provided on the guide body (3); a plurality of reversing keys (32) matching with the reversing groove (33) are provided on the reversing sleeve (4); and the outer wall of the reversing sleeve (4) is slidably matched with the limited sliding groove (34).

5. The drillable, millable, unsealed and liftable bridge plug device according to claim 4, characterized in that: A directional key (5) is arranged at the bottom of the limit sliding groove (34), a guide groove (35) matching with the directional key (5) is opened on the outer side of the reversing sleeve (4), a directional groove (36) is arranged on the outer wall of the guide body (3), and the directional key (5) is slidably matched with the directional groove (36).

6. The drillable, millable, unsealed and liftable bridge plug device according to claim 4, characterized in that: The bottom of the guide body (3) is connected to a friction mechanism, which includes a friction block body (8), a friction block (9), a friction block protective sleeve (7) and a plurality of friction block springs (10). The upper half of the friction block protective sleeve (7) is screwed to the bottom of the guide body (3), and the lower half of the friction block protective sleeve (7) is screwed to the friction block body (8). The friction block body (8) is sleeved on the outside of the lower pull rod (17), and the friction block (9) is sleeved on the outside of the friction block body (8). A plurality of friction block springs (10) are arranged between the inner wall of the friction block (9) and the friction block body (8).

7. The drillable, millable, unsealed and liftable bridge plug device according to claim 6, characterized in that: The top end of the friction block (9) is in position-limiting cooperation with the bottom end of the friction block protective sleeve (7), and the bottom end of the friction block (9) is in position-limiting cooperation with the friction block body (8).

8. The drillable, millable, unsealed and liftable bridge plug device according to claim 7, characterized in that: An anchor mechanism is provided at the bottom of the friction block body (8), and the anchor mechanism comprises an upper cone (11), a lower cone (15) and an anchor bracket (12); the top of the upper cone (11) is screwed to the bottom of the friction block body (8); the top of the anchor bracket (12) is sleeved to the bottom of the upper cone (11); the bottom of the anchor bracket (12) is sleeved to the top of the lower cone (15); the bottom of the lower cone (15) is screwed to a compression sleeve (16); an anchor tooth (13) is provided on the outer wall of the anchor bracket (12); and a hoop spring (14) is sleeved on the anchor bracket (12).

9. The drillable, millable, unsealed and liftable bridge plug device according to claim 1, characterized in that: A claw frame (18) is provided at the bottom end of the lower pull rod (17), the claw (20) is connected to the claw frame (18) via a claw pin (21), and a claw leaf spring (19) is provided between the claw (20) and the claw frame (18).

10. The drillable, millable, unsealed and liftable bridge plug device according to claim 1, characterized in that: The locking tooth (23) is made of ductile iron, and the lower end head (30), cone (25), upper anchor tooth (24) and lower anchor tooth (29) are all made of grey cast iron.

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