Underground hydraulic auxiliary drive bridge plug setting device

Abstract

The utility model discloses an underground hydraulic auxiliary drive bridge plug seat sealing device which comprises a booster cavity located in a device body, and the booster cavity is connected with an underground hydraulic environment through a liquid inlet. A piston structure is arranged in the pressurizing cavity in an axial sliding mode and used for opening and closing the liquid inlet. One end of the piston structure is connected with a driving device for driving the piston structure to linearly move, and the other end of the piston structure is connected with a setting pull rod for pulling a setting execution mechanism in the bridge plug structure. High setting force is provided by replacing gunpowder combustion with underground hydraulic boosting, so that the size of the device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge plug seat sealing, in particular to an underground hydraulic auxiliary driven bridge plug seat sealing device. Background Art

[0002] Bridge plugs are plugging tools used in oilfield wells. The sealing of bridge plugs relative to a predetermined position underground is often completed through cable sealing tools. Current cable bridge plug sealing tools mainly rely on the release of energy from the combustion of gunpowder as a power source. Firstly, gunpowder, as an explosive item, poses an operational safety risk. Secondly, in order to ensure sufficient sealing force, a sufficient amount of gunpowder must be filled. The structure required to store the gunpowder takes up a large amount of space, which can easily lead to obstruction underground. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides an underground hydraulically assisted drive bridge plug sealing device, which utilizes underground hydraulic boosting to replace gunpowder combustion to provide high sealing force, thereby reducing the size of the device.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides a downhole hydraulically assisted driven bridge plug sealing device, comprising a boosting chamber located inside the device body, wherein the boosting chamber is connected to the downhole hydraulic environment via a liquid inlet; a piston structure is axially slidably arranged inside the boosting chamber for opening and closing the liquid inlet; one end of the piston structure is connected to a driving device for driving its linear motion, and the other end thereof is connected to a sealing rod for pulling a sealing actuator in the bridge plug structure.

[0005] Furthermore, the device body includes a cylinder, and the pressure-bearing section of the piston structure is slidably matched with the cylinder; the lower port of the cylinder is fixedly connected to a liquid inlet joint, and the liquid inlet joint, the pressure-bearing section and the inner wall of the cylinder constitute the boosting chamber; the lower end of the pressure-bearing section is connected to a piston rod, and a transition hole adapted to the piston rod is axially opened in the center of the liquid inlet joint, and the liquid inlet is connected to the boosting chamber through the transition hole.

[0006] Furthermore, the transition hole is a stepped hole, and the liquid inlet is arranged on the hole wall of the small diameter section; the upper side of the small diameter section is a large diameter section for connecting to the boosting chamber; the lower end of the small diameter section is connected to a guide hole, and the guide hole is for the lower end of the piston rod to extend out, and the guide hole is sealingly and slidingly matched with the lower end of the piston rod.

[0007] Furthermore, the small diameter section and the large diameter section are both conical surface sections, and the large diameter ports of the two are both arranged close to the boost chamber.

[0008] Furthermore, the plurality of liquid inlets are arranged circumferentially on the conical surface of the small diameter section.

[0009] Furthermore, the lower end of the piston rod is sleeved with a thrust structure, and the thrust structure is in elastic contact with the lower end surface of the liquid inlet joint.

[0010] Beneficial effects: The utility model is an underground hydraulically assisted drive bridge plug sealing device, which uses the mechanical energy generated by the linear motion of the electrically driven mechanical structure and the auxiliary driving force of the underground hydraulic energy to provide a larger sealing force, reduce the overall structural volume of the device, and reduce the probability of obstruction underground; it uses green energy instead of gunpowder combustion to provide power, making the operation safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 This is a schematic cross-sectional view of the overall structure of an embodiment of the utility model;

[0012] Attached Figure 2 The figure is a schematic structural cross-sectional diagram of a liquid inlet joint according to an embodiment of the utility model. DETAILED DESCRIPTION

[0013] The utility model is further described below in conjunction with the accompanying drawings.

[0014] As attached Figure 1-2 The downhole hydraulically assisted driven bridge plug sealing device comprises a boosting chamber 1 located inside the device body, and the boosting chamber 1 is connected to the downhole hydraulic environment through a liquid inlet 11; a piston structure 2 is axially slidably arranged in the boosting chamber 1 for opening and closing the liquid inlet 11; one end of the piston structure 2 is connected to a driving device 3 for driving its linear motion, and the other end thereof is connected to a sealing rod for pulling a sealing actuator 6 in the bridge plug structure.

[0015] This solution provides a power source by lowering cables, and the electric drive device such as a motor drives the piston structure to move linearly, thereby driving the sealing actuator in the bridge plug structure to be recovered together. At the same time, the lower end surface of the device body is pushed against the outer shell of the bridge plug structure, so that the inner and outer structures of the bridge plug move relative to each other, the slip bites the sleeve ring wall, and the internal structure is self-locking, completing the firm sealing of the bridge plug structure relative to the predetermined position underground. During the process, the linear movement of the piston structure opens the originally blocked liquid inlet, and the underground hydraulic environment is connected to the internal booster chamber of the device. The liquid flows into the chamber, causing the hydraulic pressure to act on the piston structure, thereby providing auxiliary thrust, and then obtaining a greater sealing force, which solves the problem that it is difficult to achieve sufficient sealing force using conventional green energy, and can replace the power provided by the original gunpowder combustion release, and can reduce the volume of the device itself in terms of structure.

[0016] The device body includes a cylinder 4, and the pressure section 21 of the piston structure 2 is slidably matched with the cylinder 4; the lower end of the cylinder 4 is fixedly connected to the liquid inlet joint 5, and the liquid inlet joint 5, the pressure section 21 and the inner wall of the cylinder 4 form the boosting chamber 1; the lower end of the pressure section 21 is connected to the piston rod 22, and the central axis of the liquid inlet joint 5 is provided with a transition hole 51 adapted to the piston rod 22, and the liquid inlet 11 is connected to the boosting chamber 1 through the transition hole 51. Due to the high impurity content of the downhole liquid, the liquid inlet is connected to the cylinder part in the form of a joint, which is convenient for disassembly and replacement, internal cleaning and device maintenance, avoiding the blockage of the liquid inlet or the accumulation of impurities in the cavity that affects the hydraulic boosting effect, and ensuring the service life of the device. The liquid inlet joint is set at the bottom end of the cylinder, so that the liquid enters from the bottom end of the cavity and acts upward on the lower end surface of the pressure section to maximize the use of hydraulic boosting. A push cylinder is connected to the lower end of the liquid inlet joint to contact the outer shell of the bridge plug.

[0017] The transition hole 51 is a stepped hole, and the liquid inlet 11 is arranged on the hole wall of the small diameter section 511; the upper side of the small diameter section 511 is the large diameter section 512, which is used to connect to the boost chamber 1; the lower end of the small diameter section 511 is connected to the guide hole 52, and the guide hole 52 is for the lower end of the piston rod 22 to extend, and the guide hole 52 is sealed and slidably matched with the lower end of the piston rod 22. After the lower end of the piston rod extends out of the guide hole, it is connected to the seat seal actuator of the bridge plug structure, thereby driving the seat seal actuator to be recovered together. A seal is set between the guide hole and the rod surface at the lower end of the piston rod to prevent the liquid entering the cavity from seeping out from the gap, thereby ensuring sufficient boosting effect in the cavity.

[0018] Corresponding to the transition hole, the piston rod is a stepped rod adapted to the transition hole. The tight fit between the two can effectively prevent the liquid from entering the boosting chamber in other stages of non-sealing operations, thereby avoiding resistance to the device going down the well.

[0019] Preferably, the small diameter section 511 and the large diameter section 512 are both conical holes, and the large diameter ports of the two are arranged close to the boost chamber 1. The multiple liquid inlets 11 are arranged around the conical surface of the small diameter section 511. Multi-directional uniform liquid inlet is conducive to improving liquid inlet efficiency, ensuring liquid inlet stability, providing stable hydraulic thrust, and reducing the probability of blockage affecting the sealing effect. The conical hole setting can make the internal pressure increase steadily and gradually with the entry of liquid, avoiding the instantaneous increase of internal pressure causing pressure loss inside the device, thereby increasing the service life of the device.

[0020] The lower end of the piston rod 22 is sleeved with a thrust structure 23, and the thrust structure 23 is in elastic contact with the lower end surface of the liquid inlet joint 5. The thrust structure limits the movement stroke of the piston structure to avoid damage to the bridge plug structure caused by over-pull. The elastic contact can provide a certain elastic tension range to offset a small part of the overflow tension after the sealing is in place, and at the same time stop the power supply to the device to complete a reliable sealing operation.

[0021] The above is only a description of the preferred embodiment of the present invention. Ordinary technicians in this technical field can make several modifications and optimizations based on the above disclosure without departing from the above basic principles. These improvements and optimizations should be regarded as the understood protection scope of the present invention.

Claims

1. A downhole hydraulically assisted drive axle plug seat sealing device, characterized in that: The device comprises a boosting chamber (1) located inside the device body, wherein the boosting chamber (1) is connected to the downhole hydraulic environment via a liquid inlet (11); a piston structure (2) is axially slidably arranged inside the boosting chamber (1) for opening and closing the liquid inlet (11); one end of the piston structure (2) is connected to a driving device (3) for driving it to move linearly, and the other end is connected to a sealing rod for pulling a sealing actuator (6) in a bridge plug structure.

2. The downhole hydraulically assisted drive bridge plug sealing device according to claim 1, characterized in that: The device body comprises a cylinder (4), the pressure-bearing section (21) of the piston structure (2) is slidably matched with the cylinder (4); the lower end of the cylinder (4) is fixedly connected to a liquid inlet joint (5), and the liquid inlet joint (5), the pressure-bearing section (21) and the inner wall of the cylinder (4) together form the boosting chamber (1); the lower end of the pressure-bearing section (21) is connected to a piston rod (22), and a transition hole (51) adapted to the piston rod (22) is axially opened in the center of the liquid inlet joint (5), and the liquid inlet port (11) is connected to the boosting chamber (1) via the transition hole (51).

3. The downhole hydraulically assisted drive bridge plug seat sealing device according to claim 2, characterized in that: The transition hole (51) is a stepped hole, and the liquid inlet (11) is arranged on the hole wall of the small diameter section (511); the upper side of the small diameter section (511) is a large diameter section (512) for connecting to the boost chamber (1); the lower end of the small diameter section (511) is connected to the guide hole (52), and the guide hole (52) is used for the lower end of the piston rod (22) to extend out, and the guide hole (52) is in sealing and sliding cooperation with the lower end of the piston rod (22).

4. The downhole hydraulically assisted drive bridge plug seat sealing device according to claim 3, characterized in that: The small diameter section (511) and the large diameter section (512) are both conical surface sections, and the large diameter ports of both are arranged close to the boost chamber (1).

5. The downhole hydraulically assisted drive bridge plug seat sealing device according to claim 4, characterized in that: The plurality of liquid inlets (11) are arranged circumferentially on the conical surface of the small-diameter section (511).

6. A downhole hydraulically assisted drive bridge plug seat sealing device according to claim 5, characterized in that: The lower end of the piston rod (22) is sleeved with a thrust structure (23), and the thrust structure (23) is in elastic contact with the lower end surface of the liquid inlet joint (5).

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