Oilfield underground plugging tool

Abstract

The utility model relates to an oil field underground plugging tool, which belongs to the technical field of plugging equipment and comprises an upper pressure plate, a lower pressure plate, an annular elastic agent storage bag, an annular elastic air bag, a guide inner ring and a guide outer ring, a limit boss is arranged on the inner side of the bottom of the guide outer ring, and the top of the guide inner ring is in threaded connection with a limit guide ring. A limiting plug pin is arranged above the limiting guide ring, a limiting insertion hole is formed in the inner wall of the guide outer ring, a liquid pressing ring arranged on the guide outer ring in a sleeving mode is arranged above the annular elastic agent storage bag, an elastic piece is arranged at the top of the liquid pressing ring, a protective open groove is formed in the outer side wall of the liquid pressing ring, and a puncture rod is arranged in the protective open groove. The guide outer ring and the guide inner ring are connected and matched through the limiting boss and the limiting guide ring, production and assembly are more convenient, and at ordinary times, the puncture rod is hidden in the protective opening groove under the action of the elastic piece, so that the situation that the puncture rod is collided in the transportation and storage process and punctures the annular elastic agent storage bag is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oilfield downhole plugging tool and belongs to the technical field of plugging equipment. BACKGROUND

[0002] Oilfield downhole sometimes produces leakage, so it is necessary to plug the downhole tubing leakage point, and a plugging tool is used during plugging. At present, some plugging tools are provided with upper and lower pressure plates, the upper and lower pressure plates are provided with annular elastic agent storage bags, an annular elastic air bag is arranged between the two annular elastic agent storage bags, and the annular elastic agent storage bags are pierced by a piercing rod to release the plugging agent. This structure has the following disadvantages: the piercing structure is exposed, is easily damaged during transportation and storage, affects the plugging effect and the service life of the device, and the upper and lower pressure plates are connected through a sleeve joint structure, which is troublesome to manufacture and install. SUMMARY

[0003] The utility model provides an oilfield downhole plugging tool, which solves the problem that the piercing structure is exposed, is easily damaged during transportation and installation, affects the plugging effect and the service life of the device, and the upper and lower pressure plates are connected through a sleeve joint structure, which is troublesome to manufacture and install.

[0004] The utility model relates to an oilfield downhole plugging tool, which comprises upper and lower pressure plates, annular elastic agent storage bags and annular elastic air bags arranged between the upper and lower pressure plates, a guide inner ring arranged on the inner top of the lower pressure plate, a guide outer ring sleeved outside the guide inner ring and arranged on the inner bottom of the upper pressure plate, a limiting boss arranged on the inner bottom of the guide outer ring, a limiting guide ring threadedly connected to the top of the guide inner ring, a limiting bolt arranged above the limiting guide ring, a limiting insertion hole arranged on the inner wall of the guide outer ring, the annular elastic air bag arranged below the annular elastic agent storage bag, a liquid pressing ring sleeved on the guide outer ring arranged above the annular elastic agent storage bag, an elastic piece arranged between the top of the liquid pressing ring and the upper pressure plate, a plurality of protective open grooves uniformly arranged on the outer wall of the liquid pressing ring, a piercing rod arranged in each protective open groove, and the top of the piercing rod fixed to the upper pressure plate.

[0005] As a preferred option, the elastic piece comprises an elastic rubber column, a spring wrapped in the elastic rubber column, and positioning convex columns arranged on the upper and lower ends of the elastic rubber column. The bottom of the upper pressure plate and the top of the liquid pressing ring are both provided with positioning recesses, which facilitates the installation of the elastic piece.

[0006] As a preferred option, the bottom of the limiting guide ring is provided with a connecting boss, the inner top of the guide inner ring is provided with a connecting groove threadedly connected to the connecting boss, which facilitates the installation of the limiting guide ring. A sealing groove is arranged on the outer wall of the limiting guide ring, and a sealing ring is arranged in the sealing groove, which provides better sealing effect.

[0007] As a preferred, the bottom of the puncture rod is provided with a puncture blade, which facilitates the puncture of the annular elastic storage capsule.

[0008] As a preferred, the outer side wall of the annular elastic gas bag is outside the outer side wall of the lower pressing disc and the upper pressing disc, when the annular elastic gas bag is pressed, it will expand, and the annular elastic gas bag can tightly fit on the inner wall of the downhole pipe, play a sealing role, effectively prevent the leakage agent from flowing down, and ensure that the leakage agent acts on the leakage point.

[0009] As a preferred, the top of the lower pressing disc is provided with a support boss supporting the inner lower part of the annular elastic gas bag, which facilitates the support installation of the annular elastic gas bag, and the inner side of the support boss and the guide inner ring are provided with a gap, and the gap and the radial thickness of the limiting boss are in interference fit, so that the lower part of the support boss can be clamped in the gap.

[0010] As a preferred, the outer side wall of the upper pressing disc and the lower pressing disc is fixed with a leather bowl.

[0011] The utility model discloses the following beneficial effects:

[0012] The upper pressing disc and the lower pressing disc are respectively provided with a guide outer ring and a guide inner ring, the guide outer ring and the guide inner ring are connected and matched through a limiting boss and a limiting guide ring, production and assembly are more convenient, and a liquid pressing ring is arranged above the annular elastic storage capsule, an elastic element is arranged above the liquid pressing ring, the puncture rod is received in a protection open slot on the outer side wall of the liquid pressing ring, usually, the puncture rod is hidden in the protection open slot under the action of the elastic element, collision in the transportation and storage process is avoided to pierce the annular elastic storage capsule, and a limiting bolt and a limiting hole are arranged, and mutual cooperation can not cause the annular elastic storage capsule to be pierced even if the upper pressing disc and the lower pressing disc are pressed when not in use. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be obtained according to the provided drawings without creating creative labor.

[0014] The structure, proportion, size and the like disclosed in the specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions that the utility model can be implemented, so it does not have the substantial meaning of technology, any modification of structure, change of proportion relationship or adjustment of size, as long as it does not affect the effect and purpose that the utility model can produce, should still fall within the range that the technical content disclosed by the utility model can cover.

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 for Figure 1 Partial structural diagram;

[0017] Figure 3 This is a schematic diagram of the top structure of the hydraulic ring;

[0018] Figure 4 for Figure 1 Enlarged structural diagram at point A;

[0019] In the diagram: 1. Upper pressure plate; 2. Lower pressure plate; 3. Outer guide ring; 4. Inner guide ring; 5. Puncture rod; 6. Annular elastic reservoir; 7. Annular elastic airbag; 8. Support boss; 9. Gap; 10. Limiting guide ring; 11. Protective opening groove; 12. Fluid compression ring; 13. Positioning recess; 14. Elastic element; 15. Leather cup; 16. Connecting boss; 17. Limiting boss; 18. Limiting insertion hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0021] Example 1, as Figures 1 to 4 As shown, this utility model is an oilfield downhole plugging tool, including an upper pressure plate 1 and a lower pressure plate 2. An annular elastic reservoir 6 and an annular elastic air bladder 7 are provided between the upper pressure plate 1 and the lower pressure plate 2. A guide inner ring 4 is provided on the top inner side of the lower pressure plate 2, and a guide outer ring 3, fitted around the guide inner ring 4, is provided on the bottom bottom of the upper pressure plate 1. A limiting boss 17 is provided on the inner bottom of the guide outer ring 3. A limiting guide ring 10 is threadedly connected to the top of the guide inner ring 4. Above the limiting guide ring 10... A limiting pin is provided, and a limiting insertion hole 18 is provided on the inner wall of the guide outer ring 3. The annular elastic airbag 7 is located below the annular elastic reservoir 6. A pressure ring 12 is provided above the annular elastic reservoir 6 and is fitted on the guide outer ring 3. An elastic element 14 is provided between the top of the pressure ring 12 and the upper pressure plate 1. Multiple protective opening grooves 11 are evenly provided on the outer wall of the pressure ring 12. A puncture rod 5 is provided in each protective opening groove 11. The top of the puncture rod 5 is fixed to the upper pressure plate 1.

[0022] When installing, the annular elastic air bag 7 is sleeved outside the guide inner ring 4, the elastic member 14 is fixed on the liquid pressing ring 12, the outer side of the guide outer ring 3 is sequentially sleeved with the liquid pressing ring 12 and the annular elastic agent storage bag 6 containing the plugging agent, and when using, the guide outer ring 3 is then sleeved on the guide inner ring 4, then the limiting guide ring 10 is screwed, limiting and fixing are performed, and then the limiting plug is inserted into the limiting plug hole 18. During storage and transportation, even if the upper pressing disc 1 and the lower pressing disc 2 are pressed, the puncture rod 5 cannot be pulled out of the protection opening slot 11 due to the blocking of the limiting plug, and the annular elastic air bag 7 is not damaged.

[0023] The plugging device is installed below the leakage point of the downhole pipeline, and then the limiting plug is pulled out of the limiting plug hole 18. Due to the arrangement of the elastic member 14, the lower part of the puncture rod 5 cannot be pulled out of the lower part of the protection opening slot 11. Then the device is put into the oil well and seated on the plugging device, and then the upper pressing disc 1 is pressed by using a lifting and pressing cylinder or lowering a pipe. The upper pressing disc 1 and the lower pressing disc 2 are close to each other. When the elastic member 14 is deformed, the lower part of the puncture rod 5 is pulled out of the lower part of the protection opening slot 11, the annular elastic agent storage bag 6 is punctured, and the plugging agent in the annular elastic agent storage bag 6 can be uniformly pressed out to plug the pipeline at the leakage point.

[0024] In example two, on the basis of example one, the elastic member 14 comprises an elastic rubber column, the elastic rubber column is covered with a spring, and the upper and lower ends of the elastic rubber column are provided with positioning convex columns. The bottom of the upper pressing disc 1 and the top of the liquid pressing ring 12 are provided with positioning concave holes 13. When the elastic member 14 is installed, the upper and lower ends of the elastic rubber column are embedded in the positioning concave holes 13.

[0025] The bottom of the limiting guide ring 10 is provided with a connecting boss 16, the inner side of the top of the guide inner ring 4 is provided with a connecting groove which is threadedly connected with the connecting boss 16, the outer side wall of the limiting guide ring 10 is provided with a sealing groove, and the sealing groove is provided with a sealing ring. The top of the limiting guide ring 10 is provided with a tightening groove, which facilitates the tightening of the limiting guide ring 10 by using equipment.

[0026] The bottom of the puncture rod 5 is provided with a puncture blade. The plugging agent is a moisture-cured polyurethane plugging agent or an anaerobic adhesive, and the plugging agent is vacuum sealed in the annular elastic agent storage bag 6.

[0027] The outer side wall of the annular elastic air bag 7 is outside the outer side walls of the lower pressing disc 2 and the upper pressing disc 1. When the upper pressing disc 1 is pressed, the annular elastic air bag 7 is deformed, the annular elastic air bag 7 can be tightly attached to the inner wall of the downhole pipeline, plays a sealing role, effectively prevents the plugging agent from flowing downward, and ensures that the plugging agent acts on the leakage point.

[0028] The top of the lower pressing disc 2 is provided with a supporting boss 8 supporting the inner lower part of the annular elastic air bag 7, and the inner side of the supporting boss 8 is provided with a gap 9 between the guiding inner ring 4, and the gap 9 and the radial thickness of the limiting boss 17 are in interference fit. When the upper pressing disc 1 is pressed to a certain position, the limiting boss 17 will be inserted into the gap 9 and clamped.

[0029] The outer side walls of the upper pressing disc 1 and the lower pressing disc 2 are fixed with leather cups 15.

[0030] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0031] In the description of the present application, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

Claims

1. An oilfield downhole plugging tool comprising an upper pressure disc (1) and a lower pressure disc (2), between which an annular elastic fluid reservoir bladder (6) and an annular elastic gas bladder (7) are provided, characterized in that: The inner top of the lower pressing disc (2) is provided with a guide inner ring (4), the inner bottom of the upper pressing disc (1) is provided with a guide outer ring (3) sleeved outside the guide inner ring (4), the bottom inner side of the guide outer ring (3) is provided with a limiting boss (17), the top of the guide inner ring (4) is threadedly connected with a limiting guide ring (10), the upper side of the limiting guide ring (10) is provided with a limiting bolt, the inner wall of the guide outer ring (3) is provided with a limiting hole (18), the annular elastic air bag (7) is below the annular elastic storage bag (6), the upper side of the annular elastic storage bag (6) is provided with a liquid pressing ring (12) sleeved on the guide outer ring (3), the top of the liquid pressing ring (12) and the upper pressing disc (1) are provided with an elastic element (14), the outer side wall of the liquid pressing ring (12) is uniformly provided with a plurality of protective open grooves (11), each protective open groove (11) is provided with a puncture rod (5), and the top of the puncture rod (5) is fixed to the upper pressing disc (1).

2. A downhole plugging tool for use in an oilfield as defined in claim 1, characterized in that: The elastic element (14) comprises an elastic rubber column, the elastic rubber column is covered with a spring, and the upper and lower ends of the elastic rubber column are provided with positioning convex columns, and the bottom of the upper pressing disc (1) and the top of the liquid pressing ring (12) are provided with positioning recesses (13).

3. A downhole plugging tool for use in an oilfield as defined in claim 1, characterized in that: The bottom of the limiting guide ring (10) is provided with a connecting boss (16), the inner side of the top of the guide inner ring (4) is provided with a connecting groove in threaded connection with the connecting boss (16), the outer side wall of the limiting guide ring (10) is provided with a sealing groove, and the sealing groove is provided with a sealing ring.

4. The downhole plugging tool of claim 1, wherein: The bottom of the puncture rod (5) is provided with a puncture blade.

5. The downhole plugging tool of claim 1, wherein: The outer side wall of the annular elastic air bag (7) is outside the outer side walls of the lower pressing disc (2) and the upper pressing disc (1).

6. A downhole plugging tool for use in an oilfield as defined in claim 5, characterized in that: The top of the lower pressing disc (2) is provided with a supporting boss (8) supporting the inner lower part of the annular elastic air bag (7), a gap (9) is arranged between the inner side of the supporting boss (8) and the guide inner ring (4), and the gap (9) and the radial thickness of the limiting boss (17) are in interference fit.

7. The downhole plugging tool of claim 1, wherein: The outer side walls of the upper pressing disc (1) and the lower pressing disc (2) are fixed with leather bowls (15).

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