Hydraulic self-sealing device

Abstract

The utility model relates to petroleum equipment accessory technical field especially relates to a kind of hydraulic self-sealing device, including shell, double-layer capsule, oil guide ring, rubber core and upper cover, rubber core and double-layer capsule are installed in the stepped hole of shell, and double-layer capsule is located between the outer wall of rubber core and the inner wall of shell;Cavity is formed between the capsule inner layer of double-layer capsule, capsule outer layer;Upper cover is buckled on shell, and oil guide ring is installed between the bending part of capsule inner layer, capsule outer layer, and oil guide ring is the annular structure that the arc body spliced into of multiple section split type;Groove is provided on the outer circumferential surface of each arc body, and the groove on all arc bodies forms annular oil groove together;One oil passing hole is provided on each arc body, and the oil passing hole communicates cavity with annular oil groove;Oil nozzle is installed on shell, and the outlet end of oil nozzle is aligned with annular oil groove.Oil guide ring with split type structure overcomes the problem of difficult assembly of integral oil guide ring in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of petroleum equipment accessories technology, and in particular to a hydraulic self-sealing device. Background Technology

[0002] During well workover operations, hydraulic self-sealing devices are used to scrape off oil sludge from the outer wall of the tubing and seal it inside the well. For example, patent CN210714566U discloses a hydraulically controlled self-sealing device. This device is connected to the wellhead via bolts on a flange. Hydraulic oil from the tank is injected into the cavity between the outer and inner layers of the rubber sleeve, causing the double-layered sleeve to expand. This expansion compresses the bushing, causing it to deform and grip the tubing tightly. When the tubing is pulled up, the bushing gripping the tubing scrapes off the oil sludge and seals it inside the well. The amount of hydraulic oil in the double-layered sleeve can be controlled, thus changing the tightness of the bushing gripping the tubing. This allows the coupling to pass under light loads, enabling pressure relief in the double-layered sleeve and increasing its diameter.

[0003] However, the aforementioned prior art CN210714566U has the following problems: (1) The oil guide ring used is an integral ring structure. In the assembly process, it is difficult to install the entire oil guide ring between the inner and outer bending parts of the double-layer rubber sleeve.

[0004] (2) When assembling the oil pipe, it is necessary to align the oil pipe with the oil hole. If the component formed by the oil guide ring and the double-layer rubber sleeve is first installed into the housing, and then the oil pipe is assembled, it is difficult to align the oil pipe with the oil hole because the oil pipe needs to be stuck in the U-shaped groove on the upper part of the housing. It is necessary to continuously adjust the angle of the component formed by the oil guide ring and the double-layer rubber sleeve, which makes the assembly operation cumbersome. Utility Model Content

[0005] The main objective of this invention is to propose a hydraulic self-sealing device to solve the aforementioned technical problems.

[0006] To achieve the above objectives, this utility model proposes a hydraulic self-sealing device, comprising a shell, a double-layer capsule, an oil guide ring, a rubber core, and a top cover. The rubber core and the double-layer capsule are installed in a stepped hole in the shell, with the double-layer capsule located between the outer wall of the rubber core and the inner wall of the shell. A cavity is formed between the inner and outer layers of the double-layer capsule. The top cover is fastened to the shell. The oil guide ring is installed between the bent portions of the inner and outer layers of the capsule. The oil guide ring is a ring-shaped structure composed of multiple segmented arc-shaped bodies. A groove is provided on the outer circumferential surface of each arc-shaped body, and the grooves on all the arc-shaped bodies together form an annular oil groove. An oil passage hole is provided on each arc-shaped body, and the oil passage hole connects the cavity to the annular oil groove. An oil nozzle is installed on the shell, and the outlet end of the oil nozzle is aligned with the annular oil groove.

[0007] Preferably, the nozzle and the housing are connected by a thread, and a first sealing ring is provided at the connection.

[0008] Preferably, the oil guide ring is made of four arc-shaped segments spliced ​​together.

[0009] Preferably, a first protruding ring is provided on the upper surface of the bent portion of the inner layer of the capsule, and a second protruding ring is provided on the lower surface; a third protruding ring is provided on the upper surface of the bent portion of the outer layer of the capsule, and a fourth protruding ring is provided on the lower surface of the upper cover; a first slot is formed on the lower surface of the upper cover, and the first protruding ring is engaged in the first slot; a second slot is formed on the upper end surface of the arc-shaped body, and the second protruding ring is engaged in the second slot; a third slot is formed on the lower end surface of the arc-shaped body, and the third protruding ring is engaged in the third slot; a fourth slot is formed on the stepped surface of the stepped hole of the shell, and the fourth protruding ring is engaged in the fourth slot.

[0010] Preferably, an upper edge plate is integrally formed on the upper end surface of the arc-shaped body, and the outer peripheral surface of the bent portion of the inner layer of the capsule abuts against the inner arc surface of the upper edge plate; a lower edge plate is integrally formed on the lower end surface of the arc-shaped body, and the outer peripheral surface of the bent portion of the outer layer of the capsule abuts against the inner arc surface of the lower edge plate.

[0011] Preferably, an upper flange is integrally formed at the upper end of the housing, and the upper flange is connected to the upper cover by screws; a lower flange is integrally formed at the lower end of the housing, and bolt through holes are provided on the lower flange.

[0012] Preferably, a metal ring is provided at the upper end of the rubber core, and the lower end of the metal ring is embedded in the upper end of the rubber core; the outer circumferential surface of the metal ring is provided with external threads; the central hole of the upper cover is provided as a threaded hole; the metal ring is screwed into the central threaded hole of the upper cover.

[0013] Preferably, a second sealing ring is provided between the lower surface of the top cover and the upper end face of the housing, and the second sealing ring is embedded in a sealing ring mounting groove on the bottom surface of the top cover.

[0014] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: (1) The oil guide ring in this utility model is a ring structure made up of multiple separate arc-shaped bodies. During assembly, each arc-shaped body can be inserted into the bending part between the inner layer and the outer layer of the capsule, and finally the entire spliced ​​oil guide ring is formed. Therefore, the oil guide ring with a split structure overcomes the problem of difficult assembly of the integral oil guide ring in the prior art.

[0015] (2) Since the grooves on all the arc-shaped bodies together form an annular oil groove, during operation, hydraulic oil enters the annular oil groove through the oil nozzle, and then enters the cavity of the double-layer capsule through the oil passage hole on the arc-shaped body. During assembly, it is only necessary to insert the component formed by the oil guide ring and the double-layer capsule into the housing, without adjusting the angular orientation of the component, thus overcoming the defect in the prior art that requires ensuring the alignment of the oil nozzle and the oil passage hole, and achieving the purpose of simplifying assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural diagram of the hydraulic self-sealing device provided by this utility model; Figure 2 This is a cross-sectional view of the hydraulic self-sealing device provided by this utility model; Figure 3 This is a schematic diagram of the structure of an oil guide ring formed by splicing four arc-shaped bodies in this utility model; Figure 4 This is a schematic diagram of the structure of the single-segment arc-shaped body in this utility model; Figure 5 This is a cross-sectional view of the double-layer capsule in this utility model; Figure 6 This is a schematic diagram of the structure of the metal ring and the rubber core in this utility model.

[0018] Explanation of reference numerals: 1. Core; 2. Top cover; 2a. First slot; 3. Shell; 3a. Fourth slot; 3b. Upper flange; 3c. Lower flange; 4. Double-layer capsule; 4a. Outer capsule layer; 4b. Inner capsule layer; 4c. Cavity; 4d. First convex ring; 4e. Second convex ring; 4f. Third convex ring; 4g. Fourth convex ring; 5. Oil guide ring; 5a. Arc-shaped body; 5b. Groove; 5c. Annular oil groove; 5d. Oil passage hole; 5e. Second slot; 5f. Third slot; 5g. Upper edge plate; 6. Oil nozzle; 7. First sealing ring; 8. Metal ring; 9. Second sealing ring; 10. Oil pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] Combination Figures 1 to 6 As shown, a hydraulic self-sealing device includes a housing 3, a double-layer capsule 4, an oil guide ring 5, a rubber core 1, and a top cover 2. The rubber core 1 and the double-layer capsule 4 are installed in a stepped hole in the housing 3, and the double-layer capsule 4 is located between the outer wall of the rubber core 1 and the inner wall of the housing 3. The double-layer capsule 4 includes an inner capsule layer 4b and an outer capsule layer 4a, and the upper ends of both the inner capsule layer 4b and the outer capsule layer 4a are bent outward to form a bent portion. A cavity 4c for storing hydraulic oil is formed between the inner capsule layer 4b and the outer capsule layer 4a. The top cover 2 is fastened to the housing 3, and the oil guide ring 5 is installed between the bent portions of the inner capsule layer 4b and the outer capsule layer 4a.

[0023] Combination Figures 2 to 4As shown, the oil guide ring 5 is a ring structure composed of multiple segmented arc-shaped bodies 5a; specifically, the oil guide ring 5 is composed of four segmented arc-shaped bodies 5a. A groove 5b is provided on the outer circumferential surface of each segmented arc-shaped body 5a, and the grooves 5b on all the arc-shaped bodies 5a together form an annular oil groove 5c; an oil passage hole 5d is provided on each segmented arc-shaped body 5a, which connects the cavity 4c to the annular oil groove 5c; a threaded hole for installing the oil nozzle 6 is provided on the housing 3, and the position of this threaded hole corresponds to the height position of the annular oil groove 5c. Therefore, after the oil nozzle 6 is installed on the housing 3, the outlet end of the oil nozzle 6 is aligned with the annular oil groove 5c.

[0024] In this embodiment, after the oil guide ring 5 is machined as a whole by turning, it is divided into four parts by wire cutting to form four arc-shaped bodies 5a.

[0025] By adopting the above structure, since the oil guide ring 5 is a ring structure formed by splicing multiple segmented arc-shaped bodies 5a, during assembly, each segment of arc-shaped body 5a can be inserted one by one between the bending parts of the inner layer 4b and the outer layer 4a of the capsule, and finally the entire spliced ​​oil guide ring 5 is formed. In addition, it is only necessary to insert the component formed by the oil guide ring 5 and the double-layer capsule 4 into the housing 3, without adjusting the angular orientation of the component or ensuring that the oil nozzle 6 and the oil passage hole 5d are aligned, thus achieving the purpose of simplifying the assembly and playing the role of simplifying the assembly.

[0026] Combination Figure 2 As shown, the nozzle 6 is threadedly connected to the housing 3, and a first sealing ring 7 is provided at the connection. Furthermore, a second sealing ring 9 is provided between the lower surface of the upper cover 2 and the upper end face of the housing 3, and the second sealing ring 9 is embedded in a sealing ring mounting groove on the bottom surface of the upper cover 2. The first sealing ring 7 and the second sealing ring 9 achieve a sealing effect.

[0027] Combination Figure 2 , Figure 4 and Figure 5 As shown, a first protruding ring 4d is provided on the upper surface of the bent portion of the inner layer 4b of the capsule, and a second protruding ring 4e is provided on the lower surface.

[0028] A third protruding ring 4f is provided on the upper surface of the bent portion of the outer layer 4a of the capsule, and a fourth protruding ring 4g is provided on the lower surface.

[0029] A first slot 2a is provided on the lower surface of the upper cover 2, and the first protruding ring 4d is engaged in the first slot 2a.

[0030] A second slot 5e is provided on the upper end surface of the arc-shaped body 5a, and the second protruding ring 4e is engaged in the second slot 5e.

[0031] A third slot 5f is provided on the lower end surface of the arc-shaped body 5a, and the third convex ring 4f is engaged in the third slot 5f.

[0032] A fourth slot 3a is provided on the stepped surface of the stepped hole in the housing 3, and the fourth protruding ring 4g is engaged in the fourth slot 3a.

[0033] By employing the structure of four convex rings and four corresponding slots, it is easier to limit the position of the double-layer capsule 4.

[0034] Combination Figure 2 and Figure 4 As shown, an upper edge plate 5g is integrally formed on the upper end surface of the arc-shaped body 5a, and the outer peripheral surface of the bent portion of the inner capsule layer 4b abuts against the inner arc surface of the upper edge plate 5g; furthermore, a lower edge plate 5h is integrally formed on the lower end surface of the arc-shaped body 5a, and the outer peripheral surface of the bent portion of the outer capsule layer 4a abuts against the inner arc surface of the lower edge plate 5h. The upper edge plate 5g and the lower edge plate 5h can further limit the positioning of the double-layer capsule 4.

[0035] Combination Figure 2 As shown, an upper flange 3b is integrally formed at the upper end of the housing 3, and the upper flange 3b is connected to the upper cover 2 by screws; a lower flange 3c is integrally formed at the lower end of the housing 3, and bolt through holes are provided on the lower flange 3c.

[0036] Combination Figure 2 and Figure 6 As shown, in order to prevent the rubber core 1 from falling off during use, a metal ring 8 is provided at the upper end of the rubber core 1, and the lower end of the metal ring 8 is embedded in the upper end of the rubber core 1; the outer circumferential surface of the metal ring 8 is provided with external threads; the central hole of the upper cover 2 is provided with a threaded hole; the metal ring 8 is screwed into the central threaded hole of the upper cover 2 to form a threaded fit.

[0037] During well workover operations, hydraulic oil is injected through the nozzle 6. The hydraulic oil enters the annular oil groove 5c through the nozzle 6, and then enters the cavity 4c of the double-layer capsule 4 through the oil passage hole 5d on the arc-shaped body 5a. This causes the double-layer capsule 4 to expand, thereby squeezing the rubber core 1 and causing the rubber core 1 to hold the tubing 10, which seals the space between the outer wall of the tubing 10 and the inner wall of the shell 3. When pulling out the tubing, it can also scrape off the oil wax on the outer wall of the tubing 10.

[0038] When the core 1 is worn out, the core 1 is compensated by being squeezed by the double-layer capsule 4, thus extending the service life of the core 1.

[0039] When the rubber core 1 needs to be released from the oil pipe 10, the double-layer capsule 4 can release hydraulic oil through the oil nozzle 6. The double-layer capsule 4 restores its initial shape through its own elasticity, thereby releasing the rubber core 1. The rubber core 1 restores its free shape through its own elasticity, making it easier for the oil pipe 10 to pass through.

[0040] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A hydraulic self-sealing device, comprising a housing (3), a double-layer capsule (4), an oil guide ring (5), a core (1), and a top cover (2), wherein the core (1) and the double-layer capsule (4) are installed in a stepped hole in the housing (3), and the double-layer capsule (4) is located between the outer wall of the core (1) and the inner wall of the housing (3); a cavity (4c) is formed between the inner layer (4b) and the outer layer (4a) of the double-layer capsule (4); the top cover (2) is fastened to the housing (3), and the oil guide ring (5) is installed between the bent portions of the inner layer (4b) and the outer layer (4a), characterized in that: The oil guide ring (5) is a ring structure formed by splicing together multiple segmented arc-shaped bodies (5a); A groove (5b) is provided on the outer circumferential surface of each arc-shaped body (5a), and the grooves (5b) on all the arc-shaped bodies (5a) together form an annular oil groove (5c). An oil passage hole (5d) is provided on each arc-shaped body (5a), and the oil passage hole (5d) connects the cavity (4c) with the annular oil groove (5c); An oil nozzle (6) is installed on the housing (3), and the outlet end of the oil nozzle (6) is aligned with the annular oil groove (5c).

2. The hydraulic self-sealing device according to claim 1, characterized in that, The oil nozzle (6) is threadedly connected to the housing (3), and a first sealing ring (7) is provided at the connection.

3. The hydraulic self-sealing device according to claim 1, characterized in that, The oil guide ring (5) is made of four arc-shaped bodies (5a) spliced ​​together.

4. The hydraulic self-sealing device according to claim 1, characterized in that, A first protruding ring (4d) is provided on the upper surface of the bent portion of the inner layer (4b) of the capsule, and a second protruding ring (4e) is provided on the lower surface. A third protruding ring (4f) is provided on the upper surface of the bent portion of the outer layer (4a) of the capsule, and a fourth protruding ring (4g) is provided on the lower surface. A first slot (2a) is provided on the lower surface of the upper cover (2), and the first protruding ring (4d) is engaged in the first slot (2a); A second slot (5e) is provided on the upper end surface of the arc-shaped body (5a), and the second protruding ring (4e) is engaged in the second slot (5e); A third slot (5f) is provided on the lower end surface of the arc-shaped body (5a), and the third convex ring (4f) is engaged in the third slot (5f). A fourth slot (3a) is provided on the stepped surface of the stepped hole in the housing (3), and the fourth protruding ring (4g) is engaged in the fourth slot (3a).

5. A hydraulic self-sealing device according to claim 1, characterized in that, An upper edge plate (5g) is integrally formed on the upper end surface of the arc-shaped body (5a), and the outer peripheral surface of the bent portion of the capsule inner layer (4b) abuts against the inner arc surface of the upper edge plate (5g). A lower edge plate (5h) is integrally formed on the lower end surface of the arc-shaped body (5a), and the outer peripheral surface of the bent portion of the capsule outer layer (4a) abuts against the inner arc surface of the lower edge plate (5h).

6. A hydraulic self-sealing device according to claim 1, characterized in that, An upper flange (3b) is integrally formed at the upper end of the housing (3), and the upper flange (3b) is connected to the upper cover (2) by screws; a lower flange (3c) is integrally formed at the lower end of the housing (3), and bolt through holes are provided on the lower flange (3c).

7. A hydraulic self-sealing device according to claim 1, characterized in that, A metal ring (8) is provided at the upper end of the core (1), and the lower end of the metal ring (8) is embedded in the upper end of the core (1); The outer circumferential surface of the metal ring (8) is provided with external threads; the central hole of the upper cover (2) is provided with a threaded hole; the metal ring (8) is screwed into the central internal threaded hole of the upper cover (2).

8. A hydraulic self-sealing device according to claim 1, characterized in that, A second sealing ring (9) is provided between the lower surface of the upper cover (2) and the upper end face of the housing (3), and the second sealing ring (9) is embedded in the sealing ring mounting groove on the bottom surface of the upper cover (2).

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