Composite sealing soluble bridge plug structure

Abstract

The utility model relates to the technical field of oil and gas field development, in particular to a composite sealing soluble bridge plug structure which comprises a sealing rubber sleeve, a protection ring, a protection gasket, a reducing sealing ring, a cone, a tailstock, a mounting block, a connecting shaft and a plurality of slip assemblies. The hardness of the sealing rubber cylinder is lower than that of the variable-diameter sealing ring, and when the casing pipe deforms seriously or local sudden change is serious, the sealing rubber cylinder supplements and seals the part, and gaps are filled; when the reducing sealing ring is damaged by external force in the well descending process, the sealing omission position after deformation is supplemented by the sealing rubber sleeve, so that the defective part can be compensated by the sealing rubber sleeve, and the influence on the sealing effect caused by the damage of the external force in the well descending process can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field development, in particular to a composite seal soluble bridge plug structure. Background Art

[0002] In the middle and shallow layer oil testing construction, for special layers such as dry layers, water layers, gas layers and abnormally high pressure layers, in order to facilitate subsequent oil testing and plug abandoned layers, this type of bridge plug is usually used for layer sealing. At the same time, for some oil testing completed wells without development plans in the short term, it is also used for temporary plugging during multi-stage perforation of horizontal wells. Because it is soluble, the plugging needs to be removed after the construction and completely dissolved.

[0003] In the prior art, the metal variable diameter seal is mainly realized by a variable diameter seal ring. The variable diameter seal ring is made of a soluble metal with low strength but extremely high ductility. When it is subjected to an outward expansion force inside, the overall diameter becomes larger. It is installed on the side of the cone bottom of the slip close to the cone body. The inner surface is an inner conical surface that cooperates with the outer conical surface, and the radial cross-section of the outer surface is a plane; the variable diameter seal ring is a highly ductile soluble alloy, and the sealing effect is achieved by the extrusion of the outer circular surface after diameter change with the inner wall of the casing.

[0004] However, in the above-mentioned prior art, the variable diameter seal ring is a highly ductile soluble alloy. Although the material has low strength due to diameter change requirements, due to pressure-bearing requirements, a certain strength is still needed. As a result, when the casing is severely deformed or there are severe local mutations, the variable diameter seal ring cannot produce enough deformation to seal the defective part; when the variable diameter seal ring is damaged by external forces during the downhole process, the sealing effect is greatly affected. Content of the Utility Model

[0005] The purpose of the utility model is to provide a composite seal soluble bridge plug structure, which solves the problem in the prior art that the variable diameter seal ring is a highly ductile soluble alloy. Although the material has low strength due to diameter change requirements, due to pressure-bearing requirements, a certain strength is still needed. As a result, when the casing is severely deformed or there are severe local mutations, the variable diameter seal ring cannot produce enough deformation to seal the defective part; when the variable diameter seal ring is damaged by external forces during the downhole process, the sealing effect is greatly affected.

[0006] To achieve the above object, the utility model provides a composite sealing soluble bridge plug structure, which includes a sealing rubber cylinder, a protection ring, a protection gasket, a variable-diameter sealing ring, a cone, a tail seat, a mounting block, a connecting shaft and a plurality of slip assemblies. The cone is sleeved outside the connecting shaft, and the plurality of slip assemblies are respectively arranged around the cone. The tail seat is sleeved on the connecting shaft and is located on the right side of the plurality of slip assemblies. The mounting block is fixedly connected to the tail seat and is located at the left end of the tail seat. The mounting block is connected to the plurality of slip assemblies. The sealing rubber cylinder is sleeved outside the cone. The protection ring is sleeved outside the cone and abuts against the left end of the sealing rubber cylinder. The protection gasket is sleeved on the cone and is located between the plurality of slip assemblies and the sealing rubber cylinder. A variable-diameter sealing ring is arranged between the sealing rubber cylinder and the protection gasket.

[0007] Wherein, each slip assembly includes a slip block and a plurality of anchoring teeth. The slip block has a plurality of tooth holes, the slip block is arranged on the cone, and the plurality of anchoring teeth are respectively adapted to the corresponding tooth holes.

[0008] Wherein, the inner wall of the mounting block has threads, the left end of the mounting block has a plurality of grooves, and the right end of the slip block has a protrusion, and the protrusion is adapted to the corresponding groove.

[0009] Wherein, the composite sealing soluble bridge plug structure further includes a limit sleeve. The connecting shaft has a convex ring. The limit sleeve is arranged on the connecting shaft and is located on the left side of the convex ring, and the limit sleeve abuts against the left side of the cone.

[0010] Wherein, the composite sealing soluble bridge plug structure further includes a spring. The spring is sleeved on the connecting shaft and is located on the left side of the limit sleeve.

[0011] Wherein, the sealing rubber cylinder includes a sealing skeleton and a soluble rubber layer vulcanized and coated on the sealing skeleton.

[0012] Wherein, the sealing rubber cylinder is embedded in the variable-diameter sealing ring.

[0013] A composite seal soluble bridge plug structure of the present utility model, wherein the cone is sleeved outside the connecting shaft, and a plurality of the slip assemblies are respectively arranged around the outside of the cone. The tailstock is sleeved on the connecting shaft and is located on the right side of the plurality of the slip assemblies. The mounting block is fixedly connected with the tailstock and is located at the left end of the tailstock. The mounting block is connected with the plurality of the slip assemblies. The sealing rubber cylinder is sleeved outside the cone. The protective ring is sleeved outside the cone and abuts against the left end of the sealing rubber cylinder. The protective gasket is sleeved on the cone and is located between the plurality of the slip assemblies and the sealing rubber cylinder. A variable diameter sealing ring is arranged between the sealing rubber cylinder and the protective gasket. The hardness of the sealing rubber cylinder is lower than that of the variable diameter sealing ring. When the casing is severely deformed or there is a severe local mutation, the sealing rubber cylinder supplements the seal to fill the gap. When the variable diameter sealing ring is damaged by external force during the downhole process, the sealing rubber cylinder supplements the leaked part after deformation. Thus, the part that can make up for the defect can be achieved through the sealing rubber cylinder, and the influence on the sealing effect caused by being damaged by external force during the downhole process can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0015] Figure 1 It is a schematic structural diagram of the whole of the present utility model.

[0016] Figure 2 It is a cross-sectional view of the whole of the present utility model.

[0017] Figure 3 It is a schematic structural diagram of a part of the present utility model.

[0018] Figure 4 It is a side view of a part of the present utility model.

[0019] Figure 5 It is a structural diagram of the sealing rubber cylinder of the present utility model.

[0020] 1 - Sealing rubber cylinder, 2 - Protective ring, 3 - Protective gasket, 4 - Variable diameter sealing ring, 5 - Cone, 6 - Tailstock, 7 - Mounting block, 8 - Connecting shaft, 9 - Clamping block, 10 - Anchoring tooth, 11 - Tooth hole, 12 - Thread, 13 - Groove, 14 - Protrusion, 15 - Limiting sleeve, 16 - Convex ring, 17 - Spring, 1.1 - Sealing skeleton, 1.2 - Soluble rubber layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0022] Please refer to Figures 1 to 4 , wherein, Figure 1 is a schematic structural diagram of the whole of the present utility model, Figure 2 is a cross-sectional view of the whole of the present utility model, Figure 3 is a schematic structural diagram of a part of the present utility model, Figure 4 is a side view of a part of the present utility model.

[0023] The present utility model provides a composite sealing soluble bridge plug structure, including a sealing rubber cylinder 1, a protection ring 2, a protection gasket 3, a reduced-diameter sealing ring 4, a cone 5, a tail seat 6, a mounting block 7, a connecting shaft 8 and a plurality of slip assemblies. The cone 5 is sleeved outside the connecting shaft 8, and the plurality of slip assemblies are respectively arranged around the outside of the cone 5. The tail seat 6 is sleeved on the connecting shaft 8 and is located on the right side of the plurality of slip assemblies. The mounting block 7 is fixedly connected to the tail seat 6 and is located at the left end of the tail seat 6. The mounting block 7 is connected to the plurality of slip assemblies. The sealing rubber cylinder 1 is sleeved outside the cone 5. The protection ring 2 is sleeved outside the cone 5 and abuts against the left end of the sealing rubber cylinder 1. The protection gasket 3 is sleeved on the cone 5 and is located between the plurality of slip assemblies and the sealing rubber cylinder 1. The reduced-diameter sealing ring 4 is fixedly sleeved outside the sealing rubber cylinder 1. Figure 5 As shown, the sealing rubber cylinder 1 includes a sealing skeleton and a soluble rubber layer vulcanized and coated on the sealing skeleton. Preferably, the soluble rubber layer and the sealing skeleton are integrally designed to jointly expand the seal. The inside of the skeleton presses against the cone, and the outside of the skeleton presses against the outer wall through the rubber for sealing.

[0024] The sealing rubber cylinder is embedded in the reduced-diameter sealing ring. Preferably, the sealing rubber sleeve is embedded in the reduced-diameter sealing rings on both sides.

[0025] In this embodiment, the hardness of the sealing rubber cylinder 1 is lower than that of the reduced-diameter sealing ring 4. When the casing is severely deformed or there is a severe local mutation, the sealing rubber cylinder 1 supplements the seal to fill the gap. When the reduced-diameter sealing ring 4 is damaged by external force during the downhole process, the sealing rubber cylinder 1 supplements the leakage at the deformed part, so that the defective part can be compensated by the sealing rubber cylinder 1, and the influence on the sealing effect caused by external force damage during the downhole process can be avoided.

[0026] Further, each of the slips assemblies includes a slip block 9 and a plurality of anchoring teeth 10. The slip block 9 is provided with a plurality of tooth holes 11, the slip block 9 is disposed on the cone 5, and the plurality of anchoring teeth 10 are respectively adapted to the corresponding tooth holes 11.

[0027] In this embodiment, the shapes of the plurality of anchoring teeth 10 may be nail-shaped or block-shaped structures, which are adjusted according to actual use requirements, as well as the distribution mode and quantity according to actual use effects; when the setting force control is unstable, as long as the anchoring is stable, all sealing leaks are supplemented and improved by the rubber cylinder.

[0028] Further, the inner wall of the mounting block 7 has a thread 12, the left end of the mounting block 7 has a plurality of grooves 13, the right end of the slip block 9 has a convex block 14, and the convex block 14 is adapted to the corresponding groove 13.

[0029] In this embodiment, through the cooperation of the convex block 14 and the corresponding groove 13, the slip block 9 is fixed on the mounting block 7.

[0030] Further, the composite seal soluble bridge plug structure further includes a limit sleeve 15. The connecting shaft 8 has a convex ring 16. The limit sleeve 15 is disposed on the connecting shaft 8 and is located on the left side of the convex ring 16, and the limit sleeve 15 abuts against the left side of the cone 5.

[0031] In this embodiment, the cone 5 is limited by the setting of the limit sleeve 15 to prevent it from sliding, and the limit sleeve 15 is positioned by the setting of the convex ring 16.

[0032] Further, the composite seal soluble bridge plug structure further includes a spring 17. The spring 17 is sleeved on the connecting shaft 8 and is located on the left side of the limit sleeve 15.

[0033] In this embodiment, when the device is installed and used, the limit sleeve 15 is abutted and limited by the spring 17, and the protective ring protects the sealing rubber cylinder at the front; the reduced-diameter sealing ring supports the sealing rubber cylinder behind the sealing rubber cylinder and assists in sealing. An alternative way of the sealing structure of the sealing rubber cylinder is: an inlay combination method. The deformation structures of the sealing rubber cylinder and the reduced-diameter sealing ring are: the sealing rubber cylinder is inlaid in the reduced-diameter sealing rings on both sides.

[0034] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A composite sealing soluble bridge plug structure, characterized in that: include cone; A sealing rubber tube, the sealing rubber tube is sleeved on the outside of the cone A protective ring, which is sleeved on the outside of the cone and abuts against the left end of the sealing rubber tube; A plurality of slip assemblies, wherein the plurality of slip assemblies are respectively disposed around the outside of the cone; A protective gasket, which is sleeved on the cone and located between the plurality of slip assemblies and the sealing rubber cylinder; A variable diameter sealing ring, the variable diameter sealing ring is arranged between the sealing rubber tube and the protective gasket; A connecting shaft, the cone being sleeved on the outside of the connecting shaft; A tailstock, which is sleeved on the connecting shaft and located on the right side of the plurality of slip assemblies; A mounting block is fixedly connected to the tailstock and is located at the left end of the tailstock; the mounting block is connected to the plurality of slip assemblies.

2. The composite sealing soluble bridge plug structure according to claim 1, characterized in that: Each of the slip assemblies comprises a clamping block and a plurality of anchoring teeth, wherein the clamping block is provided with a plurality of tooth holes, the clamping block is arranged on the cone, and the plurality of anchoring teeth are respectively adapted to the corresponding tooth holes.

3. The composite sealing soluble bridge plug structure according to claim 2, characterized in that: The inner wall of the mounting block is provided with threads, the left end of the mounting block is provided with a plurality of grooves, and the right end of the clamping block is provided with a protrusion, and the protrusion is adapted to the corresponding groove.

4. The composite sealing soluble bridge plug structure according to claim 3, characterized in that: The composite sealing soluble bridge plug structure also includes a limiting sleeve. The connecting shaft is provided with a convex ring. The limiting sleeve is arranged on the connecting shaft and is located on the left side of the convex ring. The limiting sleeve abuts against the left side of the cone.

5. The composite sealing soluble bridge plug structure according to claim 4, characterized in that: The composite sealing soluble bridge plug structure also includes a spring, and the spring sleeve is arranged on the connecting shaft and is located on the left side of the limiting sleeve.

6. The composite sealing soluble bridge plug structure according to claim 1, characterized in that: The sealing rubber cartridge comprises Sealing frame and The soluble rubber layer coated on the sealing skeleton is vulcanized.

7. The composite sealing soluble bridge plug structure according to claim 1, characterized in that: The sealing rubber cylinder is embedded in the variable diameter sealing ring.

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