Bidirectional high-pressure resistant fishable bridge plug

Abstract

The present application relates to the field of bridge plug, especially to a bidirectional high-pressure-resistant fishable bridge plug, comprising a center pipe and a recovery sleeve, first and second locking slips are arranged at the front and rear ends of the center pipe respectively, a sealing rubber ring is arranged between the first and second locking slips, a first unsealing shaft sleeve is sleeved on the outer wall of the center pipe, the front end of the first unsealing shaft sleeve is connected with the recovery sleeve, the inner wall of the first unsealing shaft sleeve is fixed with the center pipe through a first shear ring, a first and a second front cone are arranged at the front and rear ends of the first unsealing shaft sleeve respectively, a second unsealing shaft sleeve is sleeved on the outer wall of the first unsealing shaft sleeve, the inner wall of the second unsealing shaft sleeve is fixed with the center pipe through a second shear ring. The two sets of slip systems can be expanded and anchored synchronously, and can be tightly sealed with the wellbore at the front and rear ends, so as to realize the bidirectional sealing of the wellbore from the front and rear ends, and greatly improve the pressure-bearing capacity and sealing effect of the bridge plug.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge plug, in particular to a bidirectional high-pressure-resistant fishable bridge plug. BACKGROUND

[0002] Bridge plug is a downhole tool used for sealing sections in oil and gas wellbore. It plays a sealing role by setting in the casing to isolate the upper and lower parts of the wellbore. Bridge plug is an indispensable precise sealing tool in modern oil and gas well engineering, which greatly improves the flexibility and efficiency of the operation, especially in the horizontal well staged fracturing technology.

[0003] At present, fishable bridge plug is more and more widely used in oil well construction because of its fishable characteristics. When the temporary sealing purpose is achieved, the operator can use a special fishing tool to grab it and unblock by lifting the pipe column, and finally take out the whole bridge plug from the wellbore to restore the smoothness of the wellbore. However, the existing fishable bridge plug still has the problems of low setting pressure resistance and unreliable unblocking. SUMMARY

[0004] The purpose of the present application is to provide a bidirectional high-pressure-resistant fishable bridge plug, which aims to solve the above technical problems.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A bidirectional high-pressure-resistant fishable bridge plug, comprising a center pipe and a recovery sleeve, the front and rear ends of the center pipe are respectively provided with a first locking slip and a second locking slip, a sealing rubber ring is arranged between the locking slip and the second locking slip, a unblocking shaft sleeve one is sleeved on the outer wall of the center pipe, the front end of the unblocking shaft sleeve one is connected with the recovery sleeve, the inner wall of the unblocking shaft sleeve one is fixed with the center pipe through a first shear ring, the front and rear ends of the unblocking shaft sleeve one are respectively provided with a front cone one and a front cone two, a unblocking shaft sleeve two is sleeved on the outer wall of the unblocking shaft sleeve one, the inner wall of the unblocking shaft sleeve two is fixed with the center pipe through a second shear ring, the front and rear ends of the unblocking shaft sleeve two are respectively provided with a rear cone one and a rear cone two, the conical surfaces of the front cone one and the rear cone one are matched and abut against the first locking slip, and the conical surfaces of the front cone two and the rear cone two are matched and abut against the second locking slip.

[0007] As a further scheme of the present application, the first locking slips are uniformly arranged on the outer wall of the first slip sleeve and can move radially in the first slip sleeve, and a first compression spring is arranged between the bottom of the first locking slip and the inner wall of the first slip sleeve.

[0008] As a further scheme of the present application, the front and rear rubber ring seats are arranged on the two sides of the rubber ring and abut against the side wall of the rubber ring through inclined surfaces, one end of the front rubber ring seat abuts against the first rear cone, and one end of the rear rubber ring seat abuts against the second front cone.

[0009] As a further scheme of the present application, a front matching sleeve is arranged on the inner wall of the front rubber ring seat, and a rear matching sleeve is arranged on the inner wall of the rear rubber ring seat, the front matching sleeve and the rear matching sleeve are coaxially arranged in a staggered manner and are in sliding fit with each other.

[0010] As a further scheme of the present application, the first rear cone is fixedly arranged on the outer wall of the coarse diameter section, a limiting groove is arranged on the coarse diameter section in the axial direction, the second front cone is fixedly connected with the fine diameter section through a connecting part, a plurality of matching holes are uniformly arranged on the connecting part in the circumferential direction, a stepped part is fixedly arranged between the end portions of the coarse diameter section and the fine diameter section, a plurality of positioning holes are uniformly arranged on the stepped part, and a buckling locking pin is fixedly arranged on the side wall of the stepped part between adjacent two positioning holes.

[0011] As a further scheme of the present application, the second rubber ring seat is slidably sleeved on the inner wall of the fine diameter section in the axial direction, a fixed plate is fixedly connected with the front end of the second rubber ring seat through a positioning rod, the first rear cone is fixedly connected with the fixed plate through a connecting plate, and the second front cone is fixedly connected with the outer wall of the second rubber ring seat through a connecting block.

[0012] As a further scheme of the present application, the positioning rod slidably penetrates through the corresponding positioning hole, a pin hole corresponding to the buckling locking pin is arranged on the fixed plate, and the buckling locking pin is reversely limited and blocked by the fixed plate after penetrating through the pin hole.

[0013] As a further scheme of the present application, the connecting plate is slidably installed in the corresponding limiting groove, a sliding groove is uniformly arranged on the side wall of the second rubber ring seat, the sliding groove and the matching hole are arranged in a staggered manner, the connecting part between adjacent two matching holes is slidably installed in the sliding groove, and the second rubber ring seat between adjacent two sliding grooves is slidably installed in the matching hole.

[0014] The present application has the following beneficial effects:

[0015] (1) By setting the first locking slips and the second locking slips, two independent slip anchoring systems are formed at the front and rear ends. During setting, the first locking slips start to move radially and expand under the abutting action of the front cone I and the rear cone I, and the second locking slips start to move radially and expand under the abutting action of the front cone II and the rear cone II. Since the front cone I and the front cone II are arranged on the releasing sleeve I together, and the rear cone I and the rear cone II are arranged on the releasing sleeve II together, when subjected to setting thrust, the two sets of slip systems will be able to expand and anchor synchronously, and tightly set the wellbore at the front and rear ends, thereby realizing bidirectional isolation of the wellbore from the front and rear ends, and greatly improving the pressure-bearing capacity and isolation effect of the bridge plug.

[0016] (2) By setting the releasing sleeve I and the releasing sleeve II, when releasing, the fishing tool grabs the recovery sleeve at the front end, and exerts a pulling force on the releasing sleeve I through the recovery sleeve. The releasing sleeve I will move axially under the action of the pulling force, and then force the front cone I and the rear cone I to gradually separate from one side of the taper surface of the first locking slips and the second locking slips, respectively. During the axial displacement, the buckling locking pin on the stepped portion gradually approaches the pin hole on the fixed plate, until the buckling locking pin passes through the pin hole. At this time, the recovery sleeve is subjected to a pushing force by the fishing tool. Since the buckling locking pin is blocked by the fixed plate in the opposite direction after passing through the pin hole, the releasing sleeve I will exert a pushing force on the releasing sleeve II through the fixed plate. The releasing sleeve I will drive the releasing sleeve II to move axially in the opposite direction synchronously, and then force the front cone II and the rear cone II to gradually separate from the other side of the taper surface of the first locking slips and the second locking slips, respectively. In this way, the releasing of the two sets of slips is completed synchronously between pushing and pulling, and a stable and reliable releasing process of the bridge plug is realized, which is conducive to the fishing and recovery of the bridge plug. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further described below with reference to the drawings.

[0018] Figure 1 is the overall structure schematic diagram of the application.

[0019] Figure 2 is the full section structure schematic diagram of the application.

[0020] Figure 3 is the structure schematic diagram of the sealing rubber ring in the application.

[0021] Figure 4 is the installation schematic diagram of the releasing sleeve I and the releasing sleeve II in the application.

[0022] Figure 5 is the structure schematic diagram of the releasing sleeve I in the application.

[0023] Figure 6is the structural schematic view of the second unblocking shaft sleeve in the application.

[0024] Figure 7 is the state schematic view when unblocking in the application.

[0025] In the figure: 1, central pipe; 2, recovery sleeve; 3, first locking slip; 31, first slip sleeve; 32, first compression spring; 4, sealing rubber ring; 41, front rubber ring seat; 411, front matching sleeve; 42, rear rubber ring seat; 421, rear matching sleeve; 5, second locking slip; 51, second slip sleeve; 52, second compression spring; 6, first unblocking shaft sleeve; 61, front cone one; 62, front cone two; 621, connecting part; 622, matching hole; 63, first shear ring; 64, thick diameter section; 641, limiting groove; 65, thin diameter section; 66, step part; 661, positioning hole; 662, buckling locking pin; 7, second unblocking shaft sleeve; 71, rear cone one; 711, connecting plate; 72, rear cone two; 721, connecting block; 73, second shear ring; 74, fixed plate; 741, positioning rod; 742, pin hole; 75, sliding groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0027] Please refer to Figure 1 and Figure 2 shown, the application is a bidirectional high-pressure-resistant fishable bridge plug, comprising a central pipe 1 and a recovery sleeve 2, the front and rear ends of the central pipe 1 are respectively provided with a first locking slip 3 and a second locking slip 5, a sealing rubber ring 4 is arranged in abutment between the first locking slip 3 and the second locking slip 5, a first unblocking shaft sleeve 6 is sleeved on the outer wall of the central pipe 1, the front end of the first unblocking shaft sleeve 6 is connected with the recovery sleeve 2, the inner wall of the first unblocking shaft sleeve 6 is fixed with the central pipe 1 through a first shear ring 63, the front and rear ends of the first unblocking shaft sleeve 6 are respectively provided with a front cone one 61 and a front cone two 62, a second unblocking shaft sleeve 7 is sleeved on the outer wall of the first unblocking shaft sleeve 6, the inner wall of the second unblocking shaft sleeve 7 is fixed with the central pipe 1 through a second shear ring 73, the front and rear ends of the second unblocking shaft sleeve 7 are respectively provided with a rear cone one 71 and a rear cone two 72, the taper faces of the front cone one 61 and the rear cone one 71 are matched and abut against the first locking slip 3, and the taper faces of the front cone two 62 and the rear cone two 72 are matched and abut against the second locking slip 5.

[0028] Specifically, by setting the first locking slips 3 and the second locking slips 5, two sets of independent slip anchoring systems are formed at the front and rear ends. During the setting process, the first locking slips 3 start to move radially and expand under the abutting action of the front cone one 61 and the rear cone one 71, and the second locking slips 5 start to move radially and expand under the abutting action of the front cone two 62 and the rear cone two 72. Since the front cone one 61 and the front cone two 62 are arranged on the releasing sleeve one 6 together, and the rear cone one 71 and the rear cone two 72 are arranged on the releasing sleeve two 7 together, when subjected to the setting thrust, the two sets of slip systems will be able to expand and anchor synchronously, achieving tight setting of the wellbore at the front and rear ends, thereby achieving bidirectional isolation of the wellbore from the front and rear ends, greatly improving the pressure-bearing capacity and isolation effect of the bridge plug.

[0029] As shown in Figure 1 and Figure 2 , the first locking slips 3 are circumferentially and uniformly arranged on the outer wall of the first slip sleeve 31, and the first locking slips 3 are radially movable in the first slip sleeve 31. The first compression spring 32 is arranged between the bottom of the first locking slip 3 and the inner wall of the first slip sleeve 31. The second locking slip 5 is circumferentially and uniformly arranged on the outer wall of the second slip sleeve 51, and the second locking slip 5 is radially movable in the second slip sleeve 51. The second compression spring 52 is arranged between the bottom of the second locking slip 5 and the inner wall of the second slip sleeve 51.

[0030] Specifically, the outer end faces of the first locking slips 3 and the second locking slips 5 are provided with ratchets. When subjected to the abutting thrust, the first locking slips 3 and the second locking slips 5 will move radially, thereby protruding and expanding outward from the corresponding first slip sleeve 31 and second slip sleeve 51, until the ratchets are engaged in the inner wall of the wellbore to form a firm anchoring effect. When releasing and recovering, the abutting thrust of the cone is removed to release the radial pressure on the slips. At this time, the first locking slips 3 and the second locking slips 5 will automatically reset and retreat under the elastic force of the corresponding first compression spring 32 and second compression spring 52, so that the ratchets are disengaged from the inner wall of the wellbore to facilitate subsequent recovery and fishing.

[0031] As shown in Figure 2 and Figure 3 , the sealing rubber ring 4 is provided with a front rubber ring seat 41 and a rear rubber ring seat 42 on both sides. The front rubber ring seat 41 and the rear rubber ring seat 42 are arranged in abutment with the side wall of the sealing rubber ring 4 through inclined surfaces. One end of the front rubber ring seat 41 abuts against the rear cone one 71, and one end of the rear rubber ring seat 42 abuts against the front cone two 62.

[0032] Further, the front rubber ring seat 41 is provided with a front matching sleeve 411 extending on the inner wall, and the rear rubber ring seat 42 is provided with a rear matching sleeve 421 extending on the inner wall. The front matching sleeve 411 and the rear matching sleeve 421 are coaxially and staggered arranged and are in sliding cooperation with each other.

[0033] Specifically, the sealing rubber ring 4 is made of oil-resistant and high-temperature-resistant hydrogenated butadiene-acrylonitrile rubber. During setting, the sealing rubber ring 4 is compressed and expanded outwardly under the inclined surface thrust of the front rubber ring seat 41 and the rear rubber ring seat 42, so as to form a seal with the inner wall of the wellbore. By setting the front matching sleeve 411 and the rear matching sleeve 421 in sliding cooperation with each other, the front rubber ring seat 41 and the rear rubber ring seat 42 have a certain axial displacement space relative to each other. During unsetting, the axial movement of the rear cone body one 71 or the front cone body two 62 will push the front rubber ring seat 41 and the rear rubber ring seat 42 to relatively displace, so as to avoid interference with the unsetting process due to the rigid structure.

[0034] As shown in Figure 4 and Figure 5 , the unsetting shaft sleeve one 6 includes a coarse diameter section 64 and a fine diameter section 65. The front cone body one 61 is fixedly arranged on the inner wall of the coarse diameter section 64. The coarse diameter section 64 is provided with a limiting groove 641 penetrating in the axial direction. The front cone body two 62 is fixedly connected with the fine diameter section 65 through a connecting part 621. The connecting part 621 is uniformly provided with a plurality of cooperation holes 622 penetrating in the circumferential direction. The coarse diameter section 64 and the fine diameter section 65 are fixedly provided with a stepped part 66 between the end portions. The stepped part 66 is uniformly provided with a plurality of positioning holes 661. The stepped part 66 is fixedly provided with a buckling locking pin 662 between the adjacent two positioning holes 661.

[0035] Specifically, the unsetting shaft sleeve one 6 adopts a two-section structure of the coarse diameter section 64 and the fine diameter section 65, and is connected and transitioned through the stepped part 66. The coarse diameter section 64 cooperates with the stepped part 66 to provide sufficient movement space for the unsetting displacement process of the unsetting shaft sleeve two 7. Meanwhile, the rear cone body one 71 can keep synchronous unsetting process with the front cone body one 61 through the fine diameter section 65.

[0036] As shown in Figure 4 and Figure 6 , the unsetting shaft sleeve two 7 is slidably sleeved on the outer wall of the fine diameter section 65 in the axial direction. The unsetting shaft sleeve two 7 is fixedly connected with a fixed plate 74 through a positioning rod 741 at the front end. The rear cone body one 71 is fixedly connected with the fixed plate 74 through a connecting plate 711. The rear cone body two 72 is fixedly connected with the outer wall of the unsetting shaft sleeve two 7 through a connecting block 721.

[0037] Further, the positioning rod 741 is slidably penetrated through the corresponding positioning hole 661. The fixed plate 74 is provided with a pin hole 742 corresponding to the buckling locking pin 662. After the buckling locking pin 662 is penetrated through the pin hole 742, it will be reversely limited and blocked by the fixed plate 74.

[0038] Specifically, by setting the unblocking shaft sleeve one 6 and the unblocking shaft sleeve two 7, when unblocking, the fishing tool grabs the front end of the recovery sleeve 2, and the recovery sleeve 2 exerts a pulling force on the unblocking shaft sleeve one 6 until the first shear ring 63 on the unblocking shaft sleeve one 6 is broken, at which time the constraint between the unblocking shaft sleeve one 6 and the central tube 1 is released, and the unblocking shaft sleeve one 6 will move axially under the action of the pulling force, thereby forcing the front cone one 61 and the rear cone one 71 to gradually separate from one side of the tapered surface of the first locking slip 3 and the second locking slip 5, respectively, as shown in Figure 7 - (a) shown, and during the axial displacement, the buckling locking pin 662 on the stepped portion 66 gradually approaches the pin hole 742 on the fixed plate 74, while the positioning rod 741 always remains sliding in the positioning hole 661 to ensure accurate positioning, until the buckling locking pin 662 passes through the pin hole 742, at which time the recovery sleeve 2 is subjected to a pushing force by the fishing tool, and since the buckling locking pin 662 is blocked by the fixed plate 74 in the opposite direction after passing through the pin hole 742, the unblocking shaft sleeve one 6 will exert a pushing force on the unblocking shaft sleeve two 7 through the fixed plate 74, until the second shear ring on the unblocking shaft sleeve two 7 is broken, at which time the constraint between the unblocking shaft sleeve two 7 and the central tube 1 is released, and the unblocking shaft sleeve one 6 will drive the unblocking shaft sleeve two 7 to move axially in the opposite direction, thereby forcing the front cone two 62 and the rear cone two 72 to gradually separate from the other side of the tapered surface of the first locking slip 3 and the second locking slip 5, respectively, as shown in Figure 7 - (b) shown, so that the unanchoring of the two sets of slips can be completed synchronously between pushing and pulling, realizing a stable and reliable unblocking process of the bridge plug, which is beneficial to the fishing and recovery of the bridge plug.

[0039] As shown in Figures 4-6 The connecting plate 711 is slidingly installed in the corresponding limiting groove 641, the unblocking shaft sleeve two 7 is uniformly provided with sliding grooves 75 on the side wall, the sliding grooves 75 are staggered with the matching holes 622, the connecting portion 621 between the adjacent two matching holes 622 is slidingly installed in the sliding groove 75, and the unblocking shaft sleeve two 7 between the adjacent two sliding grooves 75 is slidingly installed in the matching hole 622.

[0040] Specifically, during the axial displacement of the unblocking shaft sleeve one 6 under the action of the pulling force, the connecting plate 711 remains sliding in the limiting groove 641, and at the same time, the unblocking shaft sleeve one 6 can smoothly move relative to the unblocking shaft sleeve two 7 by utilizing the staggered sliding grooves 75 and the matching holes 622, and the unblocking shaft sleeve one 6 is prevented from unnecessary rotation during axial movement by utilizing the limiting and guiding effect.

[0041] The working principle of the present application is as follows: Figures 1-7As shown, in use, the first locking slips 3 and the second locking slips 5 form two independent slip anchoring systems at the front and rear ends, and during setting, the first locking slips 3 start to move radially and expand under the abutting action of the front cone I 61 and the rear cone I 71, and the second locking slips 5 start to move radially and expand under the abutting action of the front cone II 62 and the rear cone II 72, since the front cone I 61 and the front cone II 62 are arranged on the releasing sleeve I 6 together, and the rear cone I 71 and the rear cone II 72 are arranged on the releasing sleeve II 7 together, when subjected to the setting thrust, the two sets of slip systems will be able to expand and anchor synchronously, and tightly set the wellbore at the front and rear ends, so as to realize the bidirectional isolation of the wellbore from the front and rear ends, and at the same time, the sealing rubber ring 4 is compressed and expanded outwardly under the inclined surface thrust action of the front rubber ring seat 41 and the rear rubber ring seat 42, so as to form a seal with the inner wall of the wellbore. When releasing, the fishing tool grabs the recovery sleeve 2 at the front end, and exerts a pulling force on the releasing sleeve I 6 through the recovery sleeve 2, until the first shear ring 63 on the releasing sleeve I 6 is broken, at this time, the constraint between the releasing sleeve I 6 and the central pipe 1 is released, and the releasing sleeve I 6 will move axially under the pulling force, and then force the front cone I 61 and the rear cone I 71 to gradually separate from one side of the conical surface of the first locking slips 3 and the second locking slips 5 respectively, and in the process of axial displacement, the buckling locking pin 662 on the stepped portion 66 gradually approaches the pin hole 742 on the fixed plate 74, and at the same time, the positioning rod 741 always slides in the positioning hole 661 to ensure accurate positioning, until the buckling locking pin 662 passes through the pin hole 742, at this time, the recovery sleeve 2 is subjected to a pushing force by the fishing tool, since the buckling locking pin 662 is blocked by the fixed plate 74 in the reverse direction after passing through the pin hole 742, therefore, the releasing sleeve I 6 will exert a pushing force on the releasing sleeve II 7 through the fixed plate 74, until the second shear ring on the releasing sleeve II 7 is broken, at this time, the constraint between the releasing sleeve II 7 and the central pipe 1 is released, and the releasing sleeve I 6 will drive the releasing sleeve II 7 to move axially in the reverse direction synchronously, and then force the front cone II 62 and the rear cone II 72 to gradually separate from the other side of the conical surface of the first locking slips 3 and the second locking slips 5 respectively, so as to synchronously complete the release of the anchoring of the two sets of slips between the pushing and the pulling, and realize the stable and reliable releasing process of the bridge plug, which is conducive to the fishing and recovery of the bridge plug.

[0042] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the implementation range of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A bi-directional high pressure resistant, fishable bridge plug comprising a central pipe (1) and a retrieval sleeve (2), characterized in that, The front and rear ends of the central pipe (1) are respectively provided with a first locking slip (3) and a second locking slip (5), the sealing rubber ring (4) is arranged between the first locking slip (3) and the second locking slip (5), the outer wall of the central pipe (1) is sleeved with a first unsealing sleeve (6), the front end of the first unsealing sleeve (6) is connected with the recovery sleeve (2), the inner wall of the first unsealing sleeve (6) is fixed with the central pipe (1) through a first shearing ring (63), the front and rear ends of the first unsealing sleeve (6) are respectively provided with a front cone (61) and a rear cone (62), the outer wall of the first unsealing sleeve (6) is sleeved with a second unsealing sleeve (7), the inner wall of the second unsealing sleeve (7) is fixed with the central pipe (1) through a second shearing ring (73), the front and rear ends of the second unsealing sleeve (7) are respectively provided with a front cone (61) and a rear cone (62), the taper surfaces of the front cone (61) and the rear cone (71) are matched and abut against the first locking slip (3), and the taper surfaces of the front cone (62) and the rear cone (72) are matched and abut against the second locking slip (5).

2. The retrievable bridge plug of claim 1, wherein, The first locking slip (3) is circumferentially and uniformly arranged on the outer wall of the first slip sleeve (31), and the first locking slip (3) is radially movable in the first slip sleeve (31), the first compression spring (32) is arranged between the bottom of the first locking slip (3) and the inner wall of the first slip sleeve (31), the second locking slip (5) is circumferentially and uniformly arranged on the outer wall of the second slip sleeve (51), and the second locking slip (5) is radially movable in the second slip sleeve (51), and the second compression spring (52) is arranged between the bottom of the second locking slip (5) and the inner wall of the second slip sleeve (51).

3. The retrievable bridge plug of claim 1, wherein, The sealing rubber ring (4) is provided with a front rubber ring seat (41) and a rear rubber ring seat (42) on both sides, the front rubber ring seat (41) and the rear rubber ring seat (42) are arranged in abutment with the side wall of the sealing rubber ring (4) through inclined surfaces, one end of the front rubber ring seat (41) abuts against the rear cone (71), and one end of the rear rubber ring seat (42) abuts against the front cone (62).

4. The retrievable bridge plug of claim 3, wherein, The front matching sleeve (411) is arranged on the inner wall of the front rubber ring seat (41), the rear matching sleeve (421) is arranged on the inner wall of the rear rubber ring seat (42), and the front matching sleeve (411) and the rear matching sleeve (421) are coaxially and dislocatedly arranged and slidably matched with each other.

5. The retrievable bridge plug of claim 1, wherein, The unsealing sleeve one (6) includes a thick diameter section (64) and a thin diameter section (65), the front cone one (61) is fixedly arranged on the outer wall of the thick diameter section (64), the limit groove (641) is arranged on the thick diameter section (64) in the axial direction, the front cone two (62) is fixedly connected with the thin diameter section (65) through the connecting part (621), the matching hole (622) is uniformly arranged on the connecting part (621) in the circumferential direction, the step part (66) is fixedly arranged between the thick diameter section (64) and the thin diameter section (65), the positioning hole (661) is uniformly arranged on the step part (66), and the buckling locking pin (662) is fixedly arranged on the side wall of the step part (66) between the adjacent two positioning holes (661).

6. The retrievable bridge plug of claim 5, wherein, The unsealing sleeve two (7) is slidably sleeved on the inner wall of the thin diameter section (65) in the axial direction, the front end of the unsealing sleeve two (7) is fixedly connected with the fixed plate (74) through the positioning rod (741), the rear cone one (71) is fixedly connected with the fixed plate (74) through the connecting plate (711), and the rear cone two (72) is fixedly connected with the outer wall of the unsealing sleeve two (7) through the connecting block (721).

7. The retrievable bridge plug of claim 6, wherein, The positioning rod (741) is slidably penetrated through the corresponding positioning hole (661), the pin hole (742) corresponding to the buckling locking pin (662) is arranged on the fixed plate (74), and the buckling locking pin (662) is reversely limited and blocked by the fixed plate (74) after penetrating through the pin hole (742).

8. The retrievable bridge plug of claim 6, wherein, The connecting plate (711) is slidably installed in the corresponding limit groove (641), the sliding groove (75) is uniformly arranged on the side wall of the unsealing sleeve two (7), the sliding groove (75) and the matching hole (622) are arranged alternately, the connecting part (621) between the adjacent two matching holes (622) is slidably installed in the sliding groove (75), and the unsealing sleeve two (7) between the adjacent two sliding grooves (75) is slidably installed in the matching hole (622).

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