Pressure-bearing plugging device for drilling fluid

Abstract

The utility model relates to the technical field of well drilling leaking stoppage, and provides a pressure-bearing leaking stoppage device for drilling fluid, which comprises a support frame, a screw rod is rotatably connected to the axis of the support frame, a plugging mechanism is movably connected to the bottom end of the screw rod, and a first air bag is arranged on the outer side wall of the plugging mechanism; the first air bag, the first air bag pipe, the connecting piece, the second air bag pipe and the second air bag are matched with one another, the plugging mechanism is placed in the borehole for plugging, when cracks appear in the borehole, the plugging mechanism cannot be tightly attached to the borehole, the first air bag is subjected to opposite resistance when placed in the borehole, and the plugging mechanism cannot be tightly attached to the borehole. When a borehole is blocked, resistance can extrude a second air bag, the second air bag transmits compressed air into a first air bag pipe through a second air bag pipe and a connecting piece, the first air bag pipe drives the first air bag to bulge along the outer side wall of the first air bag, the blocking mechanism rapidly and stably blocks the borehole through the first air bag, and the practicability and convenience of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling plugging, in particular to a pressure-bearing plugging device for drilling fluid. Background Technique

[0002] Well leakage is extremely dangerous to drilling operations. During drilling operations, plugging agents need to be injected into the wellbore from the wellhead through plugging tools for plugging. Most of the existing pressure-bearing plugging devices are used for injecting plugging agents. Most of the existing pressure-bearing plugging devices are composed of a connecting pipe, a plugging disk, and a sealing ring arranged on the plugging disk. The plugging disk is inserted into the wellbore for plugging agent injection operation, and the plugging disk seals the wellbore.

[0003] For example, the patent with the publication number CN220815600U discloses a pressure-bearing plugging device using a drilling fluid plugging agent, which relates to the technical field of drilling plugging. It includes a well body, a positioning unit inside the well body, an adjustment unit fixed on the positioning unit, a liquid guide pipe assembled on the adjustment unit, and a sealing component installed on the inner wall of the well body. It also includes: the positioning unit includes a rectangular frame plate, a transverse lead screw, and a guide block. The adjustment unit includes a bearing box, a vertical lead screw, and a support block. In the utility model, after pressing down the rectangular frame plate to keep the inserted vertical bars in a tightened state, holding the first turntable can control the forward and reverse rotation of the transverse lead screw. Two of the guide blocks threadedly connected to the transverse lead screw can move relative to each other to help the two abutting arc blocks open the distance and abut against the inner wall of the well body. The height position of the inserted vertical bars is locked accordingly. The transverse guide rod is provided to guide the sliding and translation of the other two guide blocks to cooperate with the abutting arc blocks for adjustment and provide auxiliary support for them. The equipment is simple and labor-saving for the assembly and positioning operation of the sealing component.

[0004] However, in the prior art, usually the plugging mechanism is placed into the wellbore for plugging. Due to the fact that the plugging mechanism has a unified size, when cracks occur due to formation reasons and the size of the wellbore does not match and fit the plugging mechanism, the plugging effect is not ideal, thus resulting in a certain degree of limitation in the practicality of the device. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem that in the prior art, the plugging mechanism has a unified size, and when cracks occur due to formation reasons and the size of the wellbore does not match and fit the plugging mechanism, the plugging effect is not ideal.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a pressure-bearing plugging device for drilling fluid, including a support frame, a lead screw is rotatably connected to the center of the support frame, the bottom end of the lead screw is movably connected with a plugging mechanism, a first airbag is arranged on the outer side wall of the plugging mechanism, a plurality of first airbag pipes are annularly arranged inside the first airbag, and the plurality of first airbag pipes are fixedly connected through a connecting piece. A second airbag pipe is arranged on the lower surface of the connecting piece, and a second airbag is arranged at the bottom end of the second airbag pipe.

[0007] As a preferred embodiment, a shaped groove for sleeving with the first airbag is formed on the outer edge of the support frame, and a second bevel gear is drivingly connected to the upper surface of the lead screw.

[0008] As a preferred embodiment, the support frame is inlaid by three Z-shaped frames, and a plug rod is inserted at the end of each Z-shaped frame.

[0009] As a preferred embodiment, a displacement block is threadedly connected to the surface of the lead screw, and a plurality of L-shaped rods are fixedly connected to the outer side wall of the displacement block in a ring shape.

[0010] As a preferred embodiment, a lower pressing plate is fixedly connected to the lower surface of each L-shaped rod, and a buffer pad is arranged on the lower surface of each lower pressing plate.

[0011] As a preferred embodiment, a motor is fixedly connected to one side of the upper surface of the support frame, and a first bevel gear is drivingly connected to the output end of the motor.

[0012] As a preferred embodiment, the first bevel gear and the second bevel gear are meshed with each other.

[0013] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0014] By adopting the mutual cooperation among the first airbag, the first airbag tube, the connecting piece, the second airbag tube and the second airbag, the plugging mechanism is placed in the wellbore for plugging. When there are cracks in the wellbore, it will cause the plugging mechanism to not fit tightly with the wellbore. The first airbag placed in the wellbore will be subject to an opposite resistance, and the resistance will squeeze the second airbag. The second airbag transmits the compressed gas to the first airbag tube through the connecting piece via the second airbag tube, and the first airbag tube drives the first airbag to bulge along the outer side wall of the first airbag. The plugging mechanism quickly and stably plugs the wellbore through the first airbag, improving the practicability and convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front schematic view of the three-dimensional structure of a pressure-bearing plugging device for drilling fluid provided by the present utility model;

[0016] Figure 2 It is a side schematic view of the three-dimensional structure of a pressure-bearing plugging device for drilling fluid provided by the present utility model;

[0017] Figure 3 It is a schematic view of the structure at the airbag of a pressure-bearing plugging device for drilling fluid provided by the present utility model;

[0018] Figure 4Explosion schematic diagram of the airbag structure of a pressure-bearing plugging device for drilling fluid provided by the present utility model.

[0019] Legend:

[0020] 1. Support frame; 2. Plug rod; 3. Motor; 4. First bevel gear; 5. Lead screw; 6. Second bevel gear; 7. Sealing mechanism; 8. Displacement block; 9. L-shaped rod; 10. Lower pressing plate; 11. I-shaped groove; 12. First airbag; 13. First airbag tube; 14. Connector; 15. Second airbag tube; 16. Second airbag. Specific implementation manner

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-4 , the present utility model provides a technical solution: a pressure-bearing plugging device for drilling fluid, including a support frame 1, a lead screw 5 is rotatably connected to the axis center of the support frame 1, the bottom end of the lead screw 5 is movably connected to a sealing mechanism 7, a first airbag 12 is arranged on the outer side wall of the sealing mechanism 7, a plurality of first airbag tubes 13 are annularly arranged inside the first airbag 12, the plurality of first airbag tubes 13 are fixedly connected through a connector 14, a second airbag tube 15 is arranged on the lower surface of the connector 14, a second airbag 16 is arranged at the bottom end of the second airbag tube 15. The mutual cooperation among the first airbag 12, the first airbag tubes 13, the connector 14, the second airbag tube 15 and the second airbag 16 places the sealing mechanism 7 in the wellbore for plugging. When there are cracks in the wellbore, it will cause the sealing mechanism 7 not to fit tightly with the wellbore. The first airbag 12 placed in the wellbore will be subject to an opposite resistance, and the resistance will squeeze the second airbag 16. The second airbag 16 transmits the compressed gas to the first airbag tubes 13 through the second airbag tube 15 via the connector 14, and the first airbag tubes 13 drive the first airbag 12 to bulge along the outer side wall of the first airbag 12. The sealing mechanism 7 quickly and stably plugs the wellbore through the first airbag 12, improving the practicability and convenience of the device.

[0023] Such as Figures 1-4As shown in the figure, a T-shaped groove 11 for sleeving with the first airbag 12 is provided on the outer edge of the support frame 1. A second bevel gear 6 is drivingly connected to the upper surface of the lead screw 5. A motor 3 is fixedly connected to one side of the Z-shaped frame on the upper surface of the support frame 1. The output end of the motor 3 is drivingly connected to a first bevel gear 4. The first bevel gear 4 meshes with the second bevel gear 6. The output end of the motor 3 drives the second bevel gear 6 to rotate through the first bevel gear 4. The second bevel gear 6 drives the lead screw 5 to rotate. The lead screw 5 drives the displacement block 8 to move. The displacement block 8 drives the lower pressing plate 10 to move downward through the L-shaped rod 9 and abut against the surface of the plugging mechanism 7. As the lower pressing plate 10 continues to move downward, a downward pressure is applied to the upper surface of the plugging mechanism 7, improving the stability of the plugging mechanism 7.

[0024] As Figures 1-4 As shown in the figure, the support frame 1 is formed by inlaying three groups of Z-shaped frames. A plug rod 2 is inserted at the end of each Z-shaped frame. A displacement block 8 is threadedly connected to the surface of the lead screw 5. A plurality of L-shaped rods 9 are fixedly connected to the outer side wall of the displacement block 8 in a ring shape. A lower pressing plate 10 is fixedly connected to the lower surface of each L-shaped rod 9. A buffer pad is provided on the lower surface of each lower pressing plate 10. Due to the design of the buffer pad, when the lower pressing plate 10 moves downward to the upper surface of the plugging mechanism 7, at this time, the lower pressing plate 10 and the plugging mechanism 7 are attached through the buffer pad, and when the lower pressing plate 10 is pressed downward, the wear on the plugging mechanism 7 will be reduced due to the effect of the shock-absorbing pad, extending the service life of the plugging mechanism 7.

[0025] Working principle: When in use, first place the support frame 1 at the axis of the wellbore, fix the end of the support frame 1 to the ground through the plug rod 2, place the plugging mechanism 7 in the wellbore for plugging. When there are cracks in the wellbore, it will cause the plugging mechanism 7 to not fit tightly with the wellbore. The first airbag 12 placed in the wellbore will be subjected to an opposite resistance, and the resistance will squeeze the second airbag 16. The second airbag 16 transmits the compressed gas to the first airbag tube 13 through the second airbag tube 15 via the connector 14. The first airbag tube 13 drives the first airbag 12 to bulge along the outer side wall of the first airbag 12. The plugging mechanism 7 quickly and stably plugs the wellbore through the first airbag 12. At this time, the output end of the motor 3 drives the second bevel gear 6 to rotate through the first bevel gear 4. The second bevel gear 6 drives the lead screw 5 to rotate. The lead screw 5 drives the displacement block 8 to move. The displacement block 8 drives the lower pressing plate 10 to move downward through the L-shaped rod 9 and abut against the surface of the plugging mechanism 7. As the lower pressing plate 10 continues to move downward, a downward pressure is applied to the upper surface of the plugging mechanism 7, improving the stability of the plugging mechanism 7.

[0026] The above are only the preferred embodiments of the present utility model, and do not limit the present utility model in other forms. Any person skilled in the relevant art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A pressure-bearing plugging device for drilling fluid, comprising a support frame (1), characterized in that: A screw rod (5) is rotatably connected to the axis of the support frame (1), and a sealing mechanism (7) is movably connected to the bottom end of the screw rod (5). A first airbag (12) is arranged on the outer wall of the sealing mechanism (7), and a plurality of first airbag tubes (13) are arranged in a ring shape on the inner side of the first airbag (12). The plurality of first airbag tubes (13) are fixedly connected via a connecting piece (14), and a second airbag tube (15) is arranged on the lower surface of the connecting piece (14), and a second airbag (16) is arranged at the bottom end of the second airbag tube (15).

2. A pressure-bearing plugging device for drilling fluid according to claim 1, characterized in that: An I-shaped groove (11) for sleeve connection with the first airbag (12) is formed on the outer edge of the support frame (1), and a second bevel gear (6) is transmission-connected to the upper surface of the screw rod (5).

3. A pressure-bearing plugging device for drilling fluid according to claim 1, characterized in that: The support frame (1) is inlaid with three groups of Z-shaped frames, and an insertion rod (2) is inserted at the end of each Z-shaped frame.

4. A pressure-bearing plugging device for drilling fluid according to claim 1, characterized in that: The surface of the screw rod (5) is threadedly connected to a displacement block (8), and the outer side wall of the displacement block (8) is annularly fixedly connected to a plurality of L-shaped rods (9).

5. A pressure-bearing plugging device for drilling fluid according to claim 4, characterized in that: The lower surface of each L-shaped rod (9) is fixedly connected to a lower pressing plate (10), and the lower surface of each lower pressing plate (10) is provided with a buffer pad.

6. A pressure-bearing plugging device for drilling fluid according to claim 1, characterized in that: A motor (3) is fixedly connected to one side of the Z-shaped frame on the upper surface of the support frame (1), and the output end of the motor (3) is transmission-connected to a first bevel gear (4).

7. A pressure-bearing plugging device for drilling fluid according to claim 6, characterized in that: The first bevel gear (4) and the second bevel gear (6) are meshed with each other.

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