Squeezing bridge plug intubation tube sealing structure

Abstract

The utility model discloses a squeezing bridge plug intubation tube sealing structure which comprises a bridge plug body, an intubation tube structure is arranged on the bridge plug body, a sealing ring set is arranged on the intubation tube structure, and the sealing ring set is arranged between the intubation tube structure and the bridge plug body. The squeezing bridge plug intubation tube sealing structure solves the problem that an intubation tube cannot be repeatedly used when a squeezing bridge plug is used for plugging.

Description

Technical Field

[0001] This utility model belongs to the technical field of sealing equipment for oil extraction, specifically relating to the sealing structure of the injection bridge plug insertion tube. Background Technology

[0002] In oil extraction, when water is produced in the oil layer or the oil well has no production value, it is necessary to seal the oil layer or the well with cement. In order to improve the accuracy of the cement injection depth and avoid the risk of cement stuck in the drill bit caused by the high pressure overflow well, the injection bridge plug is conventionally used for sealing in this field.

[0003] During the sealing process using the injection bridge plug, it was found that several single "O-ring" rubber seals on the insertion tube would all be damaged when the insertion tube was pulled out under pressure after the formation water absorption test was performed. This prevented cement injection and required the seals to be replaced before sealing could continue. In this process, the insertion tube could not be reused, resulting in a waste of resources. Utility Model Content

[0004] The purpose of this invention is to provide a sealing structure for the injection bridge plug cannula, which solves the problem that the cannula cannot be reused when using the injection bridge plug for sealing.

[0005] The technical solution adopted by this utility model is an extrusion bridge plug insertion sealing structure, including a plug body, an insertion structure on the bridge plug body, a sealing ring assembly on the insertion structure, and the sealing ring assembly being disposed between the insertion structure and the bridge plug body.

[0006] The features of this utility model also include:

[0007] The insertion structure includes an insertion tube, a bridge plug body with a central blind hole, the insertion tube extending into the central blind hole of the bridge plug body, a setting tool threaded to the outer wall of one end of the insertion tube, a chamfered structure at the other end of the insertion tube, the setting tool contacting and connecting with the bridge plug body, and a sealing ring set on the outer wall of the other end of the insertion tube, between the insertion tube and the bridge plug body.

[0008] The sealing ring assembly includes several rubber sealing rings, with several sealing ring grooves opened on the outer wall of the insertion tube, and several rubber sealing rings corresponding to each other in the several sealing ring grooves; it also includes vulcanized sealing rings, with wide sealing ring grooves opened along the circumferential direction on the outer wall of the insertion tube, and vulcanized sealing rings placed in the wide sealing ring grooves.

[0009] Several rubber sealing rings have an "O" shaped cross section, and several sealing ring grooves are arranged parallel to each other along the circumferential direction of the outer wall of the insertion tube.

[0010] Several sealing ring grooves have trapezoidal cross-sections.

[0011] The vulcanized sealing ring includes a sealing ring housing, and a sealing ring steel ring skeleton is provided inside the sealing ring housing.

[0012] The sealing ring steel ring skeleton includes three ring skeleton steel rings, which are arranged side by side and fixed together by several ring skeleton steel ring fixing strips.

[0013] The beneficial effects of this utility model are:

[0014] The sealing structure for the extrusion bridge plug provided by this utility model, by setting several rubber rings and vulcanized sealing rings, prevents the sealing structure from being damaged by friction with the inner hole of the bridge plug body. At the same time, when the plug is pulled out under pressure, the vulcanized sealing ring is the last to move out of the bridge plug body, protecting the rubber sealing ring from the impact of high-pressure water, thereby protecting the plug and preventing damage to the plug. This facilitates the reuse of the plug and saves resources. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the extrusion bridge plug insertion sealing structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the vulcanized sealing ring of this utility model;

[0017] Figure 3 This is a schematic diagram of the steel ring skeleton of this utility model.

[0018] In the figure, 1. Bridge plug body, 2. Setting tool, 3. Insert tube, 4. Rubber sealing ring, 5. Vulcanized sealing ring, 6. Sealing ring groove, 7. Wide sealing ring groove, 8. Sealing ring shell, 9. Sealing ring steel ring skeleton, 10. Ring skeleton steel ring, 11. Ring skeleton steel ring fixing strip. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] The extrusion bridge plug insertion sealing structure provided by this utility model, such as Figure 1As shown, the device includes a bridge plug body 1, on which an insertion tube structure is provided. A sealing ring assembly is provided on the insertion tube structure for easy sealing and protection of the insertion tube structure. The sealing ring assembly is located between the insertion tube structure and the bridge plug body 1. The insertion tube structure includes an insertion tube 3. The bridge plug body 1 has a central blind hole, and the insertion tube 3 extends into the central blind hole. A setting tool 2 is threaded onto the outer wall of one end of the insertion tube 3. The other end of the insertion tube 3 has a chamfered structure. The setting tool 2 contacts and connects with the bridge plug body 1. The sealing ring assembly is located on the outer wall of the other end of the insertion tube 3. Above, a sealing ring assembly is located between the insertion tube 3 and the bridge plug body 1; the sealing ring assembly includes several rubber sealing rings 4, and several sealing ring grooves 6 are opened on the outer wall of the insertion tube 3, with the several rubber sealing rings 4 correspondingly disposed in the several sealing ring grooves 6; it also includes vulcanized sealing rings 5, with wide sealing ring grooves 7 opened along the circumferential direction on the outer wall of the insertion tube 3, with the vulcanized sealing rings 5 ​​disposed in the wide sealing ring grooves 7; the cross-sections of the several rubber sealing rings 4 are all "O" shaped, and the several sealing ring grooves 6 are arranged parallel to each other along the circumferential direction of the outer wall of the insertion tube 3; the cross-sections of the several sealing ring grooves 6 are all trapezoidal. Figure 2 As shown, the vulcanized sealing ring 5 includes a sealing ring housing 8, and a sealing ring steel ring skeleton 9 is provided inside the sealing ring housing 8. Figure 3 As shown, the sealing ring steel ring skeleton 9 includes three ring skeleton steel rings 10, which are arranged side by side and are fixedly connected by several ring skeleton steel ring fixing strips 11.

[0021] The working principle of the extrusion bridge plug insertion sealing structure provided by this utility model is as follows: In the initial state, the bridge plug body 1, the setting tool 2, and the upper insertion tube 3 form an integrated bridge plug. It is lowered into the predetermined sealing position by the oil pipe. The bridge plug is set by the oil pipe pressure. The bridge plug body 1 separates from the setting tool 2 and the upper insertion tube 3. When the insertion tube 3 is inserted into the bridge plug body 1, several rubber sealing rings 4 and vulcanized sealing rings 5 ​​form a seal with the inner wall of the bridge plug body 1. When it is lifted under pressure, since the vulcanized sealing rings 5 ​​are the last to come out of the bridge plug body, the vulcanized sealing rings 5 ​​are protected from damage due to friction with the inner hole of the bridge plug body by the sealing ring steel ring skeleton 9. The several "O"-shaped rubber sealing rings 4 are not affected by high pressure water, thereby protecting the insertion tube 3 and making it easy to reuse the insertion tube 3.

[0022] Example 1

[0023] The extrusion bridge plug insertion sealing structure proposed in this embodiment, such as Figure 1 As shown, it includes a bridge plug body 1, a cannula structure on the bridge plug body 1, a sealing ring assembly on the cannula structure, and the sealing ring assembly is located between the cannula structure and the bridge plug body 1.

[0024] Example 2

[0025] The extrusion bridge plug insertion sealing structure proposed in this embodiment, such as Figure 1As shown, the device includes a bridge plug body 1, a cannula structure on the bridge plug body 1, a sealing ring assembly on the cannula structure, and the sealing ring assembly is located between the cannula structure and the bridge plug body 1; the cannula structure includes a cannula 3, the bridge plug body 1 has a central blind hole, the cannula 3 extends into the central blind hole of the bridge plug body 1, a setting tool 2 is threaded to the outer wall of one end of the cannula 3, the other end of the cannula 3 has a chamfer structure, the setting tool 2 is in contact with the bridge plug body 1, and the sealing ring assembly is located on the outer wall of the other end of the cannula 3, between the cannula 3 and the bridge plug body 1.

[0026] Example 3

[0027] The extrusion bridge plug insertion sealing structure proposed in this embodiment, such as Figure 1 As shown, the device includes a bridge plug body 1, a cannula structure on the bridge plug body 1, and a sealing ring assembly on the cannula structure, which is located between the cannula structure and the bridge plug body 1. The cannula structure includes a cannula 3. The bridge plug body 1 has a central blind hole, and the cannula 3 extends into the central blind hole of the bridge plug body 1. A setting tool 2 is threaded to the outer wall of one end of the cannula 3, and the other end of the cannula 3 has a chamfered structure. The setting tool 2 contacts and connects with the bridge plug body 1. The sealing ring assembly is located on the outer wall of the other end of the cannula 3. Between the insertion tube 3 and the bridge plug body 1; the sealing ring assembly includes several rubber sealing rings 4, and several sealing ring grooves 6 are opened on the outer wall of the insertion tube 3, with the several rubber sealing rings 4 corresponding to each other in the several sealing ring grooves 6; it also includes vulcanized sealing rings 5, with wide sealing ring grooves 7 opened on the outer wall of the insertion tube 3 along the circumferential direction, and the vulcanized sealing rings 5 ​​are placed in the wide sealing ring grooves 7; the cross-section of the several rubber sealing rings 4 is "O" shaped, and the several sealing ring grooves 6 are arranged parallel to each other along the circumferential direction of the outer wall of the insertion tube 3; the cross-section of the several sealing ring grooves 6 is trapezoidal.

[0028] Example 4

[0029] The extrusion bridge plug insertion sealing structure proposed in this embodiment, such as Figure 1As shown, the device includes a bridge plug body 1, a cannula structure on the bridge plug body 1, and a sealing ring assembly on the cannula structure, which is located between the cannula structure and the bridge plug body 1. The cannula structure includes a cannula 3. The bridge plug body 1 has a central blind hole, and the cannula 3 extends into the central blind hole of the bridge plug body 1. A setting tool 2 is threaded to the outer wall of one end of the cannula 3, and the other end of the cannula 3 has a chamfered structure. The setting tool 2 contacts and connects with the bridge plug body 1. The sealing ring assembly is located on the outer wall of the other end of the cannula 3. Between the insertion tube 3 and the bridge plug body 1; the sealing ring assembly includes several rubber sealing rings 4, and several sealing ring grooves 6 are opened on the outer wall of the insertion tube 3, with the several rubber sealing rings 4 corresponding to each other in the several sealing ring grooves 6; it also includes vulcanized sealing rings 5, with wide sealing ring grooves 7 opened along the circumferential direction on the outer wall of the insertion tube 3, and the vulcanized sealing rings 5 ​​are located in the wide sealing ring grooves 7; the cross-sections of the several rubber sealing rings 4 are all "O" shaped, and the several sealing ring grooves 6 are arranged parallel to each other along the circumferential direction of the outer wall of the insertion tube 3; the cross-sections of the several sealing ring grooves 6 are all trapezoidal. Figure 2 As shown, the vulcanized sealing ring 5 includes a sealing ring housing 8, and a sealing ring steel ring skeleton 9 is provided inside the sealing ring housing 8.

[0030] Example 5

[0031] The extrusion bridge plug insertion sealing structure proposed in this embodiment, such as Figure 1 As shown, the device includes a bridge plug body 1, a cannula structure on the bridge plug body 1, and a sealing ring assembly on the cannula structure, which is located between the cannula structure and the bridge plug body 1. The cannula structure includes a cannula 3. The bridge plug body 1 has a central blind hole, and the cannula 3 extends into the central blind hole of the bridge plug body 1. A setting tool 2 is threaded to the outer wall of one end of the cannula 3, and the other end of the cannula 3 has a chamfered structure. The setting tool 2 contacts and connects with the bridge plug body 1. The sealing ring assembly is located on the outer wall of the other end of the cannula 3. Between the insertion tube 3 and the bridge plug body 1; the sealing ring assembly includes several rubber sealing rings 4, and several sealing ring grooves 6 are opened on the outer wall of the insertion tube 3, with the several rubber sealing rings 4 corresponding to each other in the several sealing ring grooves 6; it also includes vulcanized sealing rings 5, with wide sealing ring grooves 7 opened along the circumferential direction on the outer wall of the insertion tube 3, and the vulcanized sealing rings 5 ​​are located in the wide sealing ring grooves 7; the cross-sections of the several rubber sealing rings 4 are all "O" shaped, and the several sealing ring grooves 6 are arranged parallel to each other along the circumferential direction of the outer wall of the insertion tube 3; the cross-sections of the several sealing ring grooves 6 are all trapezoidal. Figure 2 As shown, the vulcanized sealing ring 5 includes a sealing ring housing 8, and a sealing ring steel ring skeleton 9 is provided inside the sealing ring housing 8. Figure 3 As shown, the sealing ring steel ring skeleton 9 includes three ring skeleton steel rings 10, which are arranged side by side and are fixedly connected by several ring skeleton steel ring fixing strips 11.

Claims

1. An extrusion bridge plug insertion sealing structure, characterized in that, Includes a bridge plug body (1), the bridge plug body (1) is provided with a cannula structure, the cannula structure is provided with a sealing ring group, the sealing ring group is located between the cannula structure and the bridge plug body (1); The insertion structure includes an insertion tube (3), the bridge plug body (1) has a central blind hole, the insertion tube (3) extends into the central blind hole of the bridge plug body (1), a setting tool (2) is threaded to the outer wall of one end of the insertion tube (3), the other end of the insertion tube (3) has a chamfer structure, the setting tool (2) is in contact with the bridge plug body (1), the sealing ring is set on the outer wall of the other end of the insertion tube (3), and the sealing ring is set between the insertion tube (3) and the bridge plug body (1); The sealing ring assembly includes several rubber sealing rings (4), and several sealing ring grooves (6) are opened on the outer wall of the insertion tube (3). The several rubber sealing rings (4) are respectively arranged in the several sealing ring grooves (6); it also includes a vulcanized sealing ring (5). A wide sealing ring groove (7) is opened on the outer wall of the insertion tube (3) along the circumferential direction, and the vulcanized sealing ring (5) is arranged in the wide sealing ring groove (7). The cross-section of several of the rubber sealing rings (4) is "O" shaped, and the grooves (6) of several of the sealing rings are arranged parallel to the circumferential direction of the outer wall of the insertion tube (3); The cross-sections of several of the sealing ring grooves (6) are trapezoidal; The vulcanized sealing ring (5) includes a sealing ring housing (8), and a sealing ring steel ring skeleton (9) is provided inside the sealing ring housing (8). The sealing ring steel ring skeleton (9) includes three ring skeleton steel rings (10), which are arranged side by side and are fixedly connected by several ring skeleton steel ring fixing strips (11).

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