CN214532895U

CN214532895U - Sealing assembly for dissolvable bridge plug and dissolvable bridge plug

Info

Publication number: CN214532895U
Application number: CN202023099627.7U
Authority: CN
Inventors: 陈爱民; 张亚东
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-10-29
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a but dissoluble bridging plug is with sealed assembly and dissoluble bridging plug belongs to oil gas exploitation technical field. The technical problems of poor sealing durability and temperature adaptability in the prior art are solved. The sealing assembly for the dissolvable bridge plug comprises a sealing ring and a support ring, wherein the support ring comprises at least two support parts which can slide along the radial direction, and the axial end face of the support ring is abutted with the axial end face of the sealing ring; the central holes of the support ring and the seal ring can be sleeved outside the part capable of dissolving the bridge plug, and the support part of the support ring in the expansion state can apply axial thrust to the seal ring to prevent the seal ring from deforming along the axial direction. The utility model is used for reduce the sealing member size, increase the leakproofness of bridging plug, enlarge the application scope of bridging plug.

Description

Sealing assembly for dissolvable bridge plug and dissolvable bridge plug

Technical Field

The utility model belongs to the technical field of oil gas exploitation, especially a but dissoluble for bridge plug seal assembly and set up this dissoluble for bridge plug seal assembly's dissoluble bridge plug.

Background

The bridge plug is a plugging tool used in oil and gas wells, and can plug the current oil and gas production zone so as to implement technological measures on other oil and gas production zones, and after the process is completed, the temporary plugging is removed, and a flow channel between the production zone and a shaft is established, so that the oil and gas production operation of the oil and gas wells is realized.

The sealing assembly is an important tool for sealing a gap between a bridge plug and a sleeve on the bridge plug, and the bridge plug disclosed in the Chinese patent application with the application number of 201610868106.2 provides the sealing assembly which comprises an upper reducing support ring, a sealing rubber cylinder and a lower reducing support ring, wherein the upper reducing support ring and the lower reducing support ring respectively comprise two annular assemblies. When the sealing assembly is subjected to axial pressure, the upper reducing support ring, the sealing rubber cylinder and the lower reducing support ring are radially deformed and expanded to be tightly abutted to a sleeve where the bridge plug is located, and the upper reducing support ring, the sealing rubber cylinder and the lower reducing support ring can plug a gap between a central channel inside the bridge plug and the sleeve.

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

in the prior art, the soluble bridge plug is sealed mainly by a sealing body consisting of a reducing support ring and a soluble rubber cylinder, wherein the reducing support ring is provided with a plurality of forked branches, when the soluble bridge plug is set in a sleeve in a well, the reducing support ring and the soluble rubber cylinder are extruded and expanded to seal a gap between the soluble bridge plug and a shaft, the soluble bridge plug is degraded along with the well entering time, the size of the reducing support ring is also degraded and reduced along with the well entering time, the strength of the sealing body is weakened, and the performance requirement that the soluble bridge plug is kept in the well for more than 24 hours can not be met, so the technical problems of poor sealing durability and temperature adaptability exist.

SUMMERY OF THE UTILITY MODEL

The utility model provides a but dissoluble sealing assembly for bridging plug and set up this dissoluble sealing assembly for bridging plug's dissoluble bridging plug has solved the relatively poor technical problem of sealed persistence, temperature adaptability that prior art exists. The embodiment of the utility model provides a following technical scheme at least:

the embodiment of the utility model provides a but soluble bridge plug is with sealed assembly, including sealing washer and support ring, wherein:

the rigidity of the support ring is higher than that of the sealing ring;

the support ring comprises at least two support parts which can slide along the radial direction, and the axial end face of the support ring is abutted with the axial end face of the seal ring;

the central holes of the support ring and the sealing ring can be sleeved outside a part (preferably a support cone) on the central rod of the dissolvable bridge plug;

the supporting part of the supporting ring can slide to an expansion state along the radial direction after the supporting ring receives axial thrust towards the direction close to the sealing ring and radial thrust from inside to outside (the direction far away from the axial lead), and the supporting part of the supporting ring in the expansion state can apply axial thrust to the sealing ring so as to prevent the sealing ring from deforming along the axial direction and prevent dissolved matters generated by the sealing ring from leaking.

Preferably or optionally, the support ring is made of a dissolvable or degradable material and can prevent the sealing ring from leaking before the support ring is dissolved.

Preferably or optionally, the support ring is made of a dissolvable or degradable metal material; and/or the sealing ring is made of soluble or degradable metal, or the sealing ring is made of soluble or degradable rubber.

Preferably or optionally, the cross-sectional outer contour and/or inner contour of the support part is O-shaped (or understood as annular) or C-shaped (or understood as notched annular), and a sliding slope surface is arranged on an axial end surface of each support part, and the sliding slope surfaces of the adjacent support parts are mutually abutted.

Preferably or optionally, the support ring comprises two or more support parts, and one of the two support parts, which is the part with the largest thickness in the axial direction, abuts against the other part with the smallest thickness in the axial direction.

The embodiment of the utility model provides a dissoluble bridge plug, including well core rod the utility model discloses the dissoluble sealing assembly for bridge plug that arbitrary technical scheme provided, dissoluble sealing assembly for bridge plug the support ring and the equal cover of sealing washer is established outside the part (preferably support centrum) on the well core rod of dissoluble bridge plug.

Preferably or optionally, the dissolvable bridge plug comprises a support cone and an axial extrusion, wherein:

the supporting cone is provided with a central hole and a lower outer conical surface, and the central hole of the supporting cone is sleeved on the central rod;

the support ring and the sealing ring are sleeved on the lower outer conical surface of the support cone, and the position of the sealing ring is relatively closer to the position with the largest outer diameter of the lower outer conical surface;

when the axial extrusion piece applies axial thrust to the support ring and the sealing ring to push the support ring and the sealing ring to slide on the lower outer conical surface towards the direction of gradually increasing the outer diameter, the radial inward-outward thrust exerted by the lower outer cone against the seal ring can radially deform the seal ring and seal the gap between the support cone and the casing when the dissolvable bridge plug is seated in the casing in the hydrocarbon well, meanwhile, the radial thrust from inside to outside applied by the lower outer cone to the support ring can enable the support part of the support ring to slide to an expanded state in the radial direction, and the support part of the support ring in the expanded state can apply axial thrust to the seal ring in the expanded state so as to prevent the seal ring from deforming in the axial direction and prevent the dissolved matters generated by the seal ring from leaking.

Preferably or optionally, the material of the support cone is the same as that of the support ring and can prevent the sealing ring from leaking before the support ring is dissolved.

Preferably or optionally, a limit flange is arranged on the upper end face of the axial extrusion part, a limit groove matched with the limit flange is arranged at the port of the central hole of the support ring, and the limit flange is embedded between the limit groove and the lower outer conical surface of the support cone; and/or the inner walls of the support ring and the sealing ring are respectively provided with a sliding inner slope surface matched with the lower outer conical surface of the support cone.

Preferably or optionally, the axial extrusion piece is a lower slip, an upper end inner conical surface is arranged at a port of a central hole of the lower slip, the upper end inner conical surface is sleeved on the lower part outer conical surface, a plurality of lower anchoring teeth are arranged on the outer surface of the lower slip, a detachable support body (or a lock nut or a release hand) is connected to the bottom of the center rod, the detachable support body is provided with a plurality of limiting convex teeth, the limiting convex teeth are meshed with guiding convex teeth on the lower slip, the meshing structure can enable the lower part of the lower slip to slide only in the radial direction, the detachable support body can pull the lower slip to go upward together when the detachable support body is pulled by the center rod, the lower slip gradually expands under the common action of the lower part outer conical surface and the upper end inner conical surface, and the lower anchoring teeth of the lower slip are clamped in the casing when the bridge plug is set, the support body can fall off from the central rod, and at least the support cone, the lower slip, the support ring and the sealing ring are set in the sleeve when the dissolvable bridge plug is set.

Preferably or optionally, the central rod is provided with a connecting collar, the lower part of the connecting collar is provided with a limiting outer conical surface, and the upper end of the central hole of the supporting cone is provided with a limiting inner conical surface matched with the limiting outer conical surface;

the upper end surface of the support cone is also provided with a connecting flange, and the connecting flange is in threaded connection with the upper part of the connecting collar;

when the dissolvable bridge plug is set, the support cone, the lower slip, the support ring and the sealing ring are set in the sleeve, and the sealing ring, the support ring and the lower slip are arranged between the support cone and the sleeve.

Preferably or optionally, the slip includes a plurality of ring tooth bases that the axial lead of dissoluble bridging plug was arranged, every be provided with a plurality of anchor teeth down (the slip is removed down the outer preferred integral type structure of anchor teeth down) on the tooth base outer wall, it is adjacent there is the clearance and is connected through the splice bar between the tooth base, the direction dogtooth is located on the tooth base, when the slip expands to the setting position down, the splice bar disconnection, the tooth base drives down anchor tooth card dissoluble in the cover at bridging plug place.

Preferably or optionally, well core rod is provided with the connection axle ring, the connection axle ring cover is equipped with a central section of thick bamboo, a central section of thick bamboo upper portion is provided with ends a flange, the below of the flange that ends of a central section of thick bamboo from last down overlaps in proper order and is equipped with the clamping ring, goes up the slips and support the partial section of cone, wherein:

the stop flange is abutted against the upper end face of the compression ring;

the limiting convex teeth on the compression ring are meshed with the guiding convex teeth on the upper slip, and the meshing structure can enable the upper part of the upper slip to slide only along the radial direction;

the supporting cone is also provided with an upper outer conical surface, the outer surface of the upper slip is provided with a plurality of upper anchoring teeth, and a lower end inner conical surface matched with the upper outer conical surface is arranged at the lower port of the central hole of the upper slip;

when the central rod and the central cylinder move upwards, the pressing ring can press the upper slip to move downwards, the upper slip gradually expands under the combined action of the upper outer conical surface of the supporting cone and the lower inner conical surface, when the dissolvable bridge plug is set, the upper anchoring teeth of the upper slip are clamped on the inner wall of the sleeve, and the central cylinder, the pressing ring, the upper slip, the supporting cone, the lower slip, the supporting ring and the sealing ring are set in the sleeve.

Preferably or optionally, the upper slip comprises a plurality of tooth bases arranged around the axial lead of the dissolvable bridge plug, each tooth base is provided with a plurality of upper anchoring teeth (the structure of the upper slip excluding the upper anchoring teeth is preferably an integrated structure), the adjacent tooth bases are connected through a connecting rib, the guide convex teeth are positioned on the tooth bases, when the lower slip expands to a setting position, the connecting rib is disconnected, and the tooth bases drive the upper anchoring teeth to be clamped in the sleeve where the dissolvable bridge plug is positioned.

Preferably or optionally, the central cylinder is in threaded connection with the central rod, the upper outer conical surface is in threaded connection with the lower inner conical surface, and the outer wall of the central cylinder is in threaded connection with the inner wall of the central hole of the upper slip;

and anti-withdrawal tooth structures are arranged between the lower outer conical surface of the support cone and the upper inner conical surface of the lower slip, between the upper outer conical surface of the support cone and the lower inner conical surface of the upper slip, and between the outer wall of the central cylinder and the inner wall of the central hole of the support cone, and can prevent the support cone from withdrawing after going upwards.

Preferably or optionally, well core rod is connected with a central section of thick bamboo, a central section of thick bamboo upper portion is provided with ends a flange, the below of the flange of ending a central section of thick bamboo from last down the cover in proper order be equipped with the clamping ring, go up the slips support the cone and axial extrusion spare, wherein:

the upper part of the supporting cone is provided with an upper outer conical surface which is matched with a lower end inner conical surface at the port of a central hole of the upper slip;

the sealing ring and the support ring are sequentially sleeved on the outer conical surface at the lower part of the support cone from top to bottom;

the axial extrusion piece is of a cone structure with a central hole, and the upper end face of the axial extrusion piece is pressed against the lower end face of the support ring;

the stop flange is abutted against the upper end face of the compression ring;

a lower slip is sleeved on the outer slope surface at the bottom end of the axial extrusion piece, the lower slip and the upper slip respectively comprise a hoop and a plurality of tooth bases sleeved on the hoop, and a plurality of anchoring teeth are arranged on the outer wall of each tooth base;

the bottom of the central rod is connected with a detachable support body, the end surface of the detachable support body is provided with a plurality of limiting convex teeth, the limiting convex teeth are meshed with the guiding convex teeth on the lower slip, the lower slip can expand only in the radial direction by the meshing structure, when the central rod pulls the detachable support body to move upwards, the detachable support body can pull the lower slip to move upwards together, the lower slip gradually expands under the common action of the outer slope surface at the bottom end of the axial extrusion piece and the inner slope surface at the upper end opening at the central hole port of the lower slip, the upper slip gradually expands under the common action of the outer cone surface at the upper part of the support cone and the inner slope surface at the lower end opening at the central hole port of the upper slip, and when the lower slip and the respective anchoring teeth of the upper slip are clamped on the inner wall of the sleeve, the support body that can fall off follow well core rod drops, center section of thick bamboo, the clamping ring, go up the slips, support the cone, the sealing washer, the support ring, axial extruded piece and the slips down sits and seals jointly in the cover is intraductal makes dissoluble bridge plug sit and seal.

Preferably or optionally, the central rod is provided with a connecting collar, the outer diameter of the connecting collar is larger than that of the central rod, the connecting collar is in threaded connection with the central cylinder, the upper part of the central cylinder is provided with a stop flange, and the press ring is in threaded connection with the central cylinder.

The embodiment of the utility model provides a sealing method in clearance, this clearance be that above-mentioned arbitrary technical scheme provides dissolvable bridge plug and sleeve pipe between the clearance, sealing method in this clearance, including following step:

when the axial extrusion piece exerts axial thrust on the support ring and the seal ring to push the support ring and the seal ring to slide on the lower outer conical surface towards the direction of increasing outer diameter size, the radial thrust from inside to outside, which is exerted by the lower outer conical surface on the seal ring, enables the seal ring to generate radial deformation and seals a gap between the support cone and the casing pipe when the dissolvable bridge plug is set in the casing pipe in the oil and gas well;

at the same time, the radial thrust from inside to outside exerted by the lower outer cone on the support ring causes the support part of the support ring to slide radially to the expanded state, and the support part of the support ring in the expanded state exerts an axial thrust on the seal ring in the expanded state to prevent the seal ring from deforming in the axial direction and to block (in a sheltering manner) the seal ring from leaking before the support ring dissolves.

Any one of the above technical solutions can produce at least the following technical effects:

because the support ring in the sealing assembly provided by the utility model can slide to the expansion state along the radial direction after receiving the axial thrust towards the direction close to the sealing ring and the radial thrust from the inside to the outside (the direction far away from the axial lead), the support part of the support ring in the expansion state can apply the axial thrust to the sealing ring to prevent the sealing ring from deforming along the axial direction and blocking the solute leakage generated by the sealing ring, compared with the reducing support ring in the prior art, the support ring has the supporting, shielding and sealing functions of the support ring and the sealing ring to form a tighter and reliable sealing matching relation with the sealing ring, thereby effectively reducing the possibility of leakage from the gap between the support ring and the sleeve after the soluble and degradable sealing ring is heated, and simultaneously, the gap between the support ring and the sealing ring and the force application part (such as an axial extrusion part) of the radial thrust under the extrusion from the inside to the outside (the direction far away from the axial lead) is also smaller, therefore, the technical problems of poor sealing durability and temperature adaptability in the prior art are solved.

Additionally, the utility model discloses the support ring only need exert axial thrust for the sealing washer in order to prevent the sealing washer along the axial take place deformation can, need not the support ring and take place elastic deformation and expand to the state with the inseparable butt of sleeve pipe, laminating, its axial dimensions need not to set up great from this, and simultaneously, the more progress that is showing is: the utility model discloses a sealing washer only need utilize its elasticity (flexibility) to realize sealed effect can, need not to keep stronger rigidity in order to extrude the deformation of reducing support ring and expand to the state with the inseparable butt of sleeve pipe, laminating, so the axial dimension of sealing washer also can set up lessly, and then the axial dimension of setting up the bridge plug of sealed assembly also can set up lessly.

Drawings

Fig. 1 is a schematic view illustrating a disassembly of a support ring composed of O-shaped support parts of a sealing assembly for a dissolvable bridge plug according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating disassembly of a support ring composed of C-shaped support parts of another sealing assembly for a dissolvable bridge plug from an initial state to be fractured or a support ring composed of O-shaped support parts from an initial state to be fractured according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating disassembly of a dissolvable bridge plug using one-way integrated slips according to embodiment 1 of the present invention;

fig. 4 is a schematic exploded view of a dissolvable bridge plug using one-way integral slips according to embodiment 1 of the present invention;

fig. 5 is a schematic diagram illustrating a process of operating a dissolvable bridge plug using one-way integral slips from an initial state to a set state according to embodiment 1 of the present invention;

fig. 6 is a schematic view illustrating disassembly of a dissolvable bridge plug using a two-way integrated slip according to embodiment 2 of the present invention;

fig. 7 is a schematic exploded view of a dissolvable bridge plug using a two-way integrated slip according to embodiment 2 of the present invention;

fig. 8 is a schematic diagram illustrating a process of operating a dissolvable bridge plug using two-way integrated slips from an initial state to a set state according to embodiment 2 of the present invention;

fig. 9 is a schematic view illustrating disassembly of a dissolvable bridge plug using a bi-directional combination slip according to embodiment 3 of the present invention;

fig. 10 is a schematic exploded view of a dissolvable bridge plug using bi-directional combination slips according to embodiment 3 of the present invention;

fig. 11 is a schematic diagram illustrating a process of operating a dissolvable bridge plug from an initial state to a set state using bi-directional combination slips according to embodiment 3 of the present invention.

In the figure: 1. a seal ring; 2. a support ring; 21. a support member; 210. sliding the slope surface; 211. a limiting groove; 120. sliding the inner slope surface; 3. a center pole; 31. a connecting collar; 32. a central barrel; 321. a stop flange; 311. a limiting outer conical surface; 41. a support cone; 411. limiting the inner conical surface; 412. A connecting flange; 410. a lower outer conical surface; 420. an upper external conical surface; 42. an axial extrusion; 421. A limiting flange; 422. an outer slope surface at the bottom end; 43. a sleeve; 441. an upper end inner conical surface; 442. lower anchoring teeth; 44. a detachable support; 440. limiting convex teeth; 443. a guide convex tooth; 444. a tooth base; 445. connecting ribs; 446. an inner conical surface at the lower end; 447. an upper anchoring tooth; 448. a hoop; 45. pressing a ring; 46. the slips are put on; 47. a tooth retreat prevention structure; 48. a slip is put down; 481. an inner slope surface of the upper port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail with reference to fig. 1-11. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides an axial dimension is little, use spare part few, and material cost is low and sealed effectual, the extensive sealing assembly of range of application and set up this sealing assembly's dissoluble bridging plug.

As shown in fig. 1 to 11, the sealing assembly for a dissolvable bridge plug according to the embodiment of the present invention includes a sealing ring 1 shown in fig. 3 and a support ring 2 shown in fig. 1 and 2, wherein:

the rigidity of the support ring 2 is stronger than that of the sealing ring 1; the material of the sealing ring 1 may be the same as or different from that of the existing sealing rubber tube.

The support ring 2 comprises at least two support parts 21 which can slide along the radial direction, and the axial end surface of the support ring 2 is abutted with the axial end surface of the seal ring 1;

the central holes of the support ring 2 and the sealing ring 1 can be sleeved outside a part (preferably a support cone) on the central rod 3 of the dissolvable bridge plug;

the support ring 2 can slide to an expanded state along the radial direction after receiving axial thrust towards the direction close to the seal ring 1 and radial thrust from inside to outside (the direction far away from the axial lead), and the support part 21 of the support ring 2 in the expanded state (the support part 21 of the support ring 2 can be in a state of fracturing or pressing open a small gap, and the gaps of the stacked support parts 21 are staggered in the circumferential direction of the support ring 2, namely the support part 21 is not overlapped in the axial direction) can apply axial thrust to the seal ring 1 to prevent the seal ring 1 from deforming along the axial direction and prevent the solute generated by the seal ring from leaking.

Because the support part 21 of the support ring 2 in the sealing assembly provided by the utility model can slide to the expansion state along the radial direction after the support ring 2 receives the axial thrust towards the direction close to the seal ring 1 and the radial thrust from inside to outside (the direction far away from the axial lead), the support part 21 of the support ring 2 in the expansion state (the support part 21 of the support ring 2 can be in the state of fracturing or pressing open a small gap, the gaps of the stacked support parts 21 are mutually staggered along the circumferential direction of the support ring 2, namely not overlapped along the axial direction) can apply the axial thrust to the seal ring 1 to prevent the seal ring 1 from deforming along the axial direction and prevent the solute generated by the seal ring from leaking, compared with the reducing support ring 2 in the prior art, the support and shielding and sealing functions of the support ring form a tighter and reliable sealing matching relation with the seal ring, the possibility of leakage from the gap between the support ring and the sleeve after the soluble and degradable sealing ring is heated is effectively reduced, and meanwhile, the gap between the support ring and the sealing ring and a force application part (such as an axial extrusion part) of the radial thrust under the extrusion of the radial thrust from inside to outside (the direction far away from the axial lead) is smaller, so the technical problems of poor sealing durability and temperature adaptability in the prior art are solved.

Additionally, the utility model discloses support ring 2 only need exert axial thrust for sealing washer 1 in order to prevent sealing washer 1 along the axial take place deformation can, need not support ring 2 to take place elastic deformation and expand to the state with the inseparable butt of sleeve pipe 43, laminating, its axial dimensions need not to set up great from this, and simultaneously, the more progress that is showing is: the utility model discloses a sealing washer 1 only need utilize its elasticity (flexibility) to realize sealed effect can, need not to keep stronger rigidity with extrusion reducing support ring 2 deformation and expand to with the state of the inseparable butt of sleeve pipe 43, laminating, so the axial dimension of sealing washer 1 also can set up lessly, and then the axial dimension of setting up the bridge plug of the seal assembly body also can set up lessly.

As an alternative implementation manner, in this embodiment, the support ring 2 is made of a dissolvable or degradable material and can block the seal ring 1 from leaking before the support ring 2 is dissolved. The support ring 2 made of dissolvable or degradable material does not block the fluid passage and does not obstruct the oil and gas extraction.

As an alternative implementation manner, in this embodiment, the support ring 2 is made of a dissolvable or degradable metal material, and/or the seal ring 1 is made of a dissolvable or degradable rubber. The support ring 2 is preferably the same as the bridge plug except the other parts of the sealing ring 1, and the design is convenient for material taking and mass production.

As an alternative, in the present embodiment, the cross-sectional outer contour and/or inner contour of the support part 21 is in an O shape (or understood as a ring shape) or a C shape (or understood as a ring shape with a notch) as shown in fig. 1, and a sliding slope surface 210 is provided on an axial end surface of each support part 21, and the sliding slope surfaces 210 of adjacent support parts 21 abut against each other. The abutment surface of the support ring 2 with the sealing ring is preferably flat. The above structure is designed to facilitate the support part 21 to slide to the expansion state along the radial direction after the support part 21 receives the axial thrust towards the direction approaching to the sealing ring 1 and the radial thrust from the inside to the outside (the direction far away from the axial lead). Of course, the sliding slope 210 may also be an arc surface or a curved surface, as long as the sliding can be realized, which is within the protection scope of the present invention. As an alternative implementation manner, the number of the supporting parts 21 included in the supporting ring 2 in this embodiment is preferably two (three or more), and the portion with the largest thickness in the axial direction in one of the two supporting parts 21 is abutted with the portion with the smallest thickness in the axial direction in the other supporting part.

The structure is compact, the assembly is convenient, and the thickness and the size of the whole support ring 2 in the axial direction are easy to be ensured to be consistent.

Dissolvable bridge plug example 1 (one-way integral slips):

as shown in fig. 3, fig. 4 and fig. 5, the embodiment of the present invention provides a dissolvable bridge plug, including center core rod 3, the present invention provides a dissolvable sealing assembly for bridge plug, wherein support ring 2 and seal ring 1 of the dissolvable sealing assembly for bridge plug are all sleeved outside the component (preferably support cone) on center core rod 3 of the dissolvable bridge plug. The soluble bridge plug is preferably made of soluble materials.

As an alternative embodiment, the dissolvable bridge plug in this embodiment comprises a support cone 41 and an axial extrusion 42, wherein:

the support cone 41 is provided with a central hole and a lower outer conical surface 410 (in the present invention, all slopes can be replaced by conical surfaces or curved surfaces with similar characteristics, such as cambered surfaces), and the central hole of the support cone 41 is sleeved on the central rod 3;

the support ring 2 and the sealing ring 1 are sleeved on the lower outer conical surface 410 of the support cone 41, and the position of the sealing ring 1 is relatively closer to the position where the outer diameter of the lower outer conical surface 410 is maximum;

when the axial extrusion piece 42 applies axial thrust to the support ring 2 and the seal ring 1 to push the support ring 2 and the seal ring 1 to slide towards the direction of gradually increasing outer diameter dimension on the lower outer conical surface 410, the radial thrust from inside to outside applied by the lower outer conical surface 410 to the seal ring 1 can cause the seal ring 1 to deform radially and seal a gap between the support cone 41 and the sleeve 43 when the bridge plug is seated in the sleeve 43 in the oil-gas well, meanwhile, the radial thrust from inside to outside applied by the lower outer conical surface 410 to the support ring 2 can cause the support part 21 of the support ring 2 to slide radially to an expanded state, the support part 21 of the support ring 2 in the expanded state (the support part 21 of the support ring 2 can be in a state of fracturing or pressing open a small gap at this time, and the two right-hand drawings in three drawings of fig. 2 can show a state of fracturing of the O-shaped support ring 2 and a state of fracturing of the C-shaped support ring 2) and can apply axial thrust to the seal ring 1 in the expanded state So as to prevent the sealing ring 1 from deforming along the axial direction and prevent the solute generated by the sealing ring from leaking.

The axial extrusion piece 42 applies axial thrust and radial thrust from inside to outside to the support ring 2 and the seal ring 1, so that the support ring 2 and the seal ring 1 can be ensured to be deformed synchronously, and when the sleeve 43 for setting the bridge plug in an oil and gas well can be dissolved, the support ring 2 can still apply axial thrust to the expanded seal ring 1 even if being fractured, and the sealing effect is ensured.

As an alternative embodiment, the material of the support cone 41 in this embodiment is the same as the material of the support ring 2. This design is convenient for draw materials, is favorable to supporting cone 41 and the volume production of support ring 2.

As an alternative embodiment, the upper end surface of the axial extrusion member 42 in this embodiment is provided with a limit flange 421, the port of the central hole of the support ring 2 is provided with a limit groove 211 matched with the limit flange 421, and the limit flange 421 is embedded between the limit groove 211 and the lower outer conical surface 410 of the support cone 41. And/or the inner walls of the support ring 2 and the seal ring 1 are provided with sliding inner slopes 120 which are matched with the lower outer conical surface 410 of the support cone 41. The taper or slope of the sliding inner ramp 120 of the support ring 2 and the sealing ring 1, respectively, is preferably uniform.

The matching structure formed by the limiting flange 421 and the limiting groove 211 can reliably limit the supporting ring 2, so as to ensure that the supporting ring is not pressed to turn over, and further ensure that the supporting ring 1 can provide reliable supporting force.

The arrangement of the sliding inner slope 120 can ensure smooth expansion and sliding of the support ring 2 and the seal ring 1.

As an alternative embodiment, the axial extrusion 42 in this embodiment is a lower slip, the port of the central hole of the lower slip is provided with an upper inner tapered surface 441, the upper inner tapered surface 441 is sleeved on the lower outer tapered surface 410, the outer surface of the lower slip is provided with a plurality of lower anchoring teeth 442, the bottom of the center rod 3 is connected with a detachable support 44 (or called as a locking nut or a release), the detachable support 44 is provided with a plurality of limiting convex teeth 440, the limiting convex teeth 440 are engaged with the guiding convex teeth 443 on the lower slip, and the engagement structure enables the lower portion of the lower slip to slide only in the radial direction, during the upward movement of the detachable support 44 by the center rod 3, the detachable support 44 pulls the lower slip upward together, the lower slip gradually expands under the combined action of the lower outer tapered surface 410 and the upper inner tapered surface 441 and when the bridge plug is seated, the lower anchoring teeth 442 of the lower slip are clamped in the casing 43, the disengageable support 44 is disengaged from the central stem 3 and at least the support cone 41, lower slip, support ring 2 and seal ring 1 are set in the casing 43 when the dissolvable bridge plug is set.

As an alternative embodiment, in this embodiment, the central rod 3 is provided with a connection collar 31, the lower portion of the connection collar 31 is provided with a limiting outer conical surface 311, and the upper end of the central hole of the support cone 41 is provided with a limiting inner conical surface 411 matched with the limiting outer conical surface 311;

the upper end face of the support cone 41 is also provided with a connecting flange 412, and the connecting flange 412 is in threaded connection with the upper part of the connecting collar 31;

the support cone 41, the lower slip, the support ring 2 and the seal ring 1 are set in the casing 43 when the dissolvable bridge plug is set, and the seal ring 1, the support ring 2 and the lower slip are arranged between the support cone 41 and the casing 43.

The structure enables the bridge plug parts remained in the sleeve 43 to be the minimum after the setting, greatly reduces the axial size of the bridge plug and the bridge plug setting part, and enlarges the application range of the bridge plug.

As an alternative embodiment, the lower slip in this embodiment includes a plurality of tooth bases 444 arranged around the axial center line of the dissolvable bridge plug, a plurality of lower anchoring teeth 442 are disposed on the outer wall of each tooth base 444 (the structure of the lower slip excluding the lower anchoring teeth 442 is preferably an integral structure), a gap exists between adjacent tooth bases 444 and is connected by a connecting rib 445, the guiding convex tooth 443 is located on the tooth base 444, when the lower slip expands to the setting position, the connecting rib 445 is disconnected, and the tooth base 444 drives the lower anchoring teeth 442 to be clamped in the casing 43 in which the dissolvable bridge plug is located.

The lower slip is preferably a one-piece construction, with the exception of the lower anchoring teeth 442, which provides the advantage of ease of assembly. At this point there is only one lower slip, the anchoring force it exerts on the casing 43 being unidirectional, so called unidirectional one-piece slip.

Dissolvable bridge plug example 2 (two-way integral slip):

as shown in fig. 6, 7 and 8, in the present embodiment, the center rod 3 is provided with a connection collar 31, the connection collar 31 is sleeved with a center cylinder 32, the upper portion of the center cylinder 32 is provided with a stop flange 321, and a press ring 45, an upper slip 46 and a partial section of the support cone 41 are sequentially sleeved below the stop flange 321 of the center cylinder 32 from top to bottom, wherein:

the stop flange 321 abuts against the upper end face of the pressing ring 45;

the limit convex teeth 440 on the press ring 45 are engaged with the guide convex teeth 443 on the upper slip 46 and the engagement structure enables the upper part of the upper slip 46 to slide only in the radial direction;

the supporting cone 41 is also provided with an upper outer conical surface 420, the outer surface of the upper slip 46 is provided with a plurality of upper anchoring teeth 447, and a lower end inner conical surface 446 matched with the upper outer conical surface 420 is arranged at the lower port of the central hole of the upper slip 46;

when the central rod 3 and the central cylinder 32 go upwards, the pressing ring 45 presses the upper slip 46 to go downwards, the upper slip 46 gradually expands along the radial direction under the combined action of the upper outer conical surface 420 and the lower inner conical surface 446 of the supporting cone 41, the upper anchoring teeth 447 of the upper slip 46 are clamped on the inner wall of the sleeve 43 when the dissolvable bridge plug is set, and the central cylinder 32, the pressing ring 45, the upper slip 46, the supporting cone 41, the lower slip 48, the supporting ring 2 and the sealing ring 1 are set in the sleeve 43.

The anchoring teeth of the upper and

lower slips

46, 48 are anchored together in the casing 43, ensuring the setting reliability.

In an alternative embodiment, the upper slip 46 in this embodiment includes a plurality of tooth bases 444 arranged around the axial center line of the dissolvable bridge plug, a plurality of upper anchoring teeth 447 are disposed on the outer wall of each tooth base 444 (the structure of the upper slip 46 excluding the upper anchoring teeth 447 is preferably an integral structure), adjacent tooth bases 444 are separated and connected by a connecting rib 445, the guiding convex tooth 443 is disposed on the tooth base 444, and when the lower slip 48 is expanded to the setting position, the connecting rib 445 is disconnected, and the tooth bases 444 drive the upper anchoring teeth 447 to be stuck in the sleeve 43 in which the bridge plug is dissolvable.

The anchoring force applied to the casing 43 by the two slips, upper slip 46 and lower slip 48, is bi-directional and is therefore referred to as a bi-directional integral slip.

As an alternative implementation, in this embodiment, the central cylinder 32 is screwed with the central rod 3, the upper outer conical surface 420 is screwed with the lower inner conical surface 446, and the outer wall of the central cylinder 32 is screwed with the inner wall of the central hole of the upper slip 46; the threaded connection has the advantages of compact structure and convenient disassembly and assembly.

Anti-back tooth structures 47 are arranged between the lower outer conical surface 410 of the support cone 41 and the upper inner conical surface 441 of the lower slip 48, between the upper outer conical surface 420 of the support cone 41 and the lower inner conical surface 446 of the upper slip 46, and between the outer wall of the central cylinder 32 and the inner wall of the central hole of the support cone 41, and the anti-back tooth structures 47 can prevent the support cone 41 from moving back after moving upwards. The anti-back tooth structure 47 is preferably a ratchet structure, which can prevent the back-up of the support cone 41, thereby ensuring the reliability of the setting.

Dissolvable bridge plug example 3 (two-way combination slip):

as shown in fig. 9, 10 and 11, in the present embodiment, the center rod 3 is connected to a center cylinder 32, a stop flange 321 is provided at the upper part of the center cylinder 32, and a press ring 45, an upper slip 46, a support cone 41 and an axial extrusion 42 are sequentially sleeved below the stop flange 321 of the center cylinder 32 from top to bottom, wherein:

the upper part of the supporting cone 41 is provided with an upper outer conical surface 420, and the upper outer conical surface 420 is matched with a lower inner conical surface 446 at the central hole port of the upper slip 46;

the sealing ring 1 and the support ring 2 are sequentially sleeved on the lower outer conical surface 410 of the support cone 41 from top to bottom;

the axial extrusion piece 42 is a cone structure with a central hole, and the upper end surface of the axial extrusion piece is pressed against the lower end surface of the support ring 2;

the stop flange 321 abuts against the upper end face of the pressing ring 45;

the limiting convex teeth 440 on the press ring 45 are engaged with the guiding convex teeth 443 on the upper slip 46, and the engagement structure enables the upper part of the upper slip 46 to slide only in the radial direction;

the outer sloping surface 422 at the bottom end of the axial extrusion piece 42 is sleeved with a lower slip 48, each of the lower slip 48 and the upper slip 46 comprises a hoop 448 and a plurality of tooth bases 444 sleeved on the hoop 448, and the outer wall of each tooth base 444 is provided with a plurality of anchoring teeth;

the bottom of the central rod 3 is connected with a detachable support body 44, the end surface of the detachable support body 44 is provided with a plurality of limiting convex teeth 440, the limiting convex teeth 440 are engaged with the guiding convex teeth 443 on the lower slip 48, and the engagement structure can enable the lower slip 48 to expand only in the radial direction, when the central rod 3 pulls the detachable support body 44 to move upwards, the detachable support body 44 can pull the lower slip 48 to move upwards together, the lower slip 48 is gradually expanded under the common action of the bottom outer slope 422 of the axial extrusion piece 42 and the upper inner slope 481 at the central hole port of the lower slip 48, the upper slip 46 is gradually expanded under the common action of the upper outer cone 420 of the support cone 41 and the lower inner slope 481 at the central hole port of the upper slip 46, when the anchoring teeth of the lower slip 48 and the upper slip 46 are clamped on the inner wall of the sleeve 43, the detachable support body 44 falls off from the central rod 3, the central cylinder 32, press ring 45, upper slips 46, support cone 41, seal ring 1, support ring 2, axial extrusion 42, and lower slips 48 are collectively set within the casing 43 to set the dissolvable bridge plug.

The lower slip 48 and the upper slip 46 of this embodiment are constructed in the same manner as the prior art (e.g., chinese patent application No. 201610868106.2) and are combined slips.

As an alternative embodiment, in the present embodiment, the central rod 3 is provided with a connection collar 31, the outer diameter of the connection collar 31 is larger than that of the central rod 3, the connection collar 31 is in threaded connection with the central cylinder 32, the upper portion of the central cylinder 32 is provided with a stop flange 321, and the press ring 45 is in threaded connection with the central cylinder 32.

The structure is favorable for enlarging the inner drift diameter of the bridge plug, meanwhile, the arrangement of the connecting collar ring 31 enlarges the circumferential size of the central rod 3, and the weight and the consumed materials of the central rod 3 are saved because the connecting collar ring is only arranged in a small section of area in the axial direction of the central rod 3.

The embodiment of the utility model provides a sealing method in clearance, this clearance does the utility model provides a clearance between dissoluble bridging plug and the sleeve pipe that above-mentioned arbitrary technical scheme provided, the sealing method in clearance between dissoluble bridging plug and the sleeve pipe, including following step:

when the axial extrusion piece 42 applies an axial thrust to the support ring 2 and the seal ring 1 to push the support ring 2 and the seal ring 1 to slide on the lower outer conical surface 410 in a direction in which the outer diameter size gradually increases, the radial thrust from the inside to the outside applied by the lower outer conical surface 410 to the seal ring 1 causes the seal ring 1 to deform radially and seals a gap between the support cone 41 and the sleeve 43 when the bridge plug is seated in the casing 43 in the oil and gas well, and at the same time, the radial thrust from the inside to the outside applied by the lower outer conical surface 410 to the support ring 2 causes the support part 21 of the support ring 2 to slide radially to an expanded state, the support ring 2 in the expanded state (the support part 21 of the support ring 2 may be in a state of fracturing or pressing open a small gap, and the gaps of the stacked support parts 21 are mutually staggered in the circumferential direction of the support ring 2, that is, not overlapped in the axial direction) applies an axial thrust to the seal ring 1 in the expanded state to prevent the seal ring 1 from deforming in the axial direction and can be deformed in the axial direction And the sealing ring is prevented from leaking before the support ring is dissolved.

When the dissolvable bridge plug is set, the adapter of the bridge plug feeding tool is used for pulling or pulling the central rod 3 upwards (in the direction close to the wellhead), meanwhile, the pushing cylinder (or called as an outer cylinder) of the bridge plug feeding tool is used for pushing or pushing downwards (in the direction close to the well bottom) the supporting cone 41 shown in the figures 3-5 or the pressing ring 45 shown in the figures 6-9, the central rod 3 is pulled out until the anchoring teeth are clamped on the inner wall of the sleeve 43, the central rod 3 is pulled out, the detachable supporting body 44 synchronously falls off, and the dissolvable bridge plug can be set in the sleeve 43.

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

Claims

1. The utility model provides a dissoluble bridge plug is with sealed assembly which characterized in that, includes sealing washer and support ring, wherein:

the rigidity of the support ring is higher than that of the sealing ring;

the central holes of the support ring and the sealing ring can be sleeved outside the part on the central rod of the dissolvable bridge plug;

the support ring can slide to an expansion state along the radial direction after receiving axial thrust towards the direction close to the seal ring and radial thrust from inside to outside, and the support part of the support ring in the expansion state can apply axial thrust to the seal ring so as to prevent the seal ring from deforming along the axial direction and prevent dissolved matters generated by the seal ring from leaking.

2. The dissolvable bridge plug seal assembly according to claim 1, wherein said support ring is of a dissolvable or degradable material and blocks leakage of said seal ring prior to dissolution of said support ring.

3. The dissolvable bridge plug seal assembly according to claim 1, wherein said support ring is made of a dissolvable or degradable metal material; and/or the presence of a gas in the gas,

the sealing ring is made of dissolvable or degradable metal, or the sealing ring is made of dissolvable or degradable rubber.

4. The dissolvable bridge plug sealing assembly according to claim 1, wherein said support elements have an O-shaped or C-shaped cross-sectional outer profile and/or inner profile, each support element having a sliding ramp disposed on an axial end face thereof, wherein adjacent sliding ramps of said support elements abut one another.

5. The dissolvable bridge plug seal assembly according to claim 1, wherein said support ring comprises two or more of said support parts and wherein a portion of one of said two support parts having a greatest axial thickness abuts a portion of the other of said two support parts having a least axial thickness.

6. A dissolvable bridge plug, comprising a central rod, the sealing assembly of any of claims 1-5, said support ring and said sealing ring of said sealing assembly being sleeved over a feature on said central rod of said dissolvable bridge plug.

7. The dissolvable bridge plug according to claim 6, comprising a support cone and an axial extrusion, wherein:

8. The dissolvable bridge plug of claim 7, wherein the material of the support cone is the same as the material of the support ring.

9. The dissolvable bridge plug according to claim 7, wherein a stop flange is provided on an upper end face of the axial extrusion, a stop groove matching the stop flange is provided at a port of the central bore of the support ring, and the stop flange is embedded between the stop groove and the lower outer conical surface of the support cone; and/or the inner walls of the support ring and the sealing ring are respectively provided with a sliding inner slope surface matched with the lower outer conical surface of the support cone.

10. The dissolvable bridge plug according to claim 7, wherein said axial extrusion is a lower slip, an upper inner tapered surface is disposed at a port of a central bore of said lower slip, said upper inner tapered surface is sleeved on said lower outer tapered surface, a plurality of lower anchoring teeth are disposed on an outer surface of said lower slip, a releasable support is connected to a bottom of said center rod, said releasable support is provided with a plurality of limiting teeth, said limiting teeth are engaged with said guiding teeth on said lower slip and said engaging structure enables a lower portion of said lower slip to slide only in a radial direction, said releasable support pulls said lower slip upward during upward movement of said releasable support, said releasable support pulls said lower slip upward together, said lower anchoring teeth of said lower slip gradually expand under the combined action of said lower outer tapered surface and said upper inner tapered surface when said dissolvable bridge plug is seated and said dissolvable tooth of said lower slip is caught in said casing, the support body can fall off from the central rod, and at least the support cone, the lower slip, the support ring and the sealing ring are set in the sleeve when the dissolvable bridge plug is set.

11. The dissolvable bridge plug according to claim 10, wherein said central rod is provided with a collar, a lower portion of said collar being provided with a limiting outer conical surface, an upper end of said support cone central bore being provided with a limiting inner conical surface matching said limiting outer conical surface;

12. The dissolvable bridge plug according to claim 10, wherein said central rod is provided with a connecting collar, said connecting collar is provided with a central barrel, an upper portion of said central barrel is provided with a stop flange, and a press ring, an upper slip and a partial section of said support cone are sequentially sleeved below the stop flange of said central barrel from top to bottom, wherein:

the stop flange is abutted against the upper end face of the compression ring;

13. The dissolvable bridge plug according to claim 12, wherein said central cylinder is threaded with said central rod, said upper outer tapered surface is threaded with said lower inner tapered surface, and an outer wall of said central cylinder is threaded with an inner wall of said central bore of said upper slip;

14. The dissolvable bridge plug of claim 7, wherein the center rod is connected with a center barrel, the upper portion of the center barrel is provided with a stop flange, a compression ring, an upper slip, a support cone and the axial extrusion are sequentially sleeved below the stop flange of the center barrel from top to bottom, wherein:

the stop flange is abutted against the upper end face of the compression ring;