Disposable bridge plug setting tool

Abstract

The main structure of the disposable bridge plug setting tool is composed of an ignition assembly, a gunpowder cavity body, a shear pin, a limiting ring, a push cylinder body, a connecting rod, an inner sealing ring, an acting cavity, a pressure transmission hole, a pressure relief hole and the like. The ignition assembly is connected with the input end of the gunpowder cavity body through a threaded sealing ring, and the output end of the gunpowder cavity body is connected with the connecting rod through threads to form a gunpowder cavity body assembly. The disposable bridge plug setting tool with the smallest outer diameter in the current petroleum perforation field is achieved, the disposable bridge plug setting tool is applied to bridge plug setting construction operation of slim-hole sleeves and sidetracking wells, the length of a standard bridge plug setting tool is reduced by two times, the length of a gun string is effectively shortened, the construction efficiency is improved, and the construction cost is reduced. And the trafficability of the gun string in a shaft with a smaller curvature radius is powerfully improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well perforation operations, and in particular to a disposable bridge plug setting tool. Background Art

[0002] With the development of perforating technology for oil and gas wells, bridge plug setting technology has become an increasingly common technology, especially with the emergence of a large number of small wellbores and sidetracked wells, which has created a demand for bridge plug setting for small wellbore casing. The main technical difficulty in setting bridge plugs for small wellbore casing is the small inner diameter of the casing, which is generally in the range of 70-90mm, exceeding the inner diameter of the casing suitable for setting bridge plugs using commonly used bridge plug tools in the current technical field. On the other hand, small wellbores are often horizontal wells, and the horizontal sections of small wellbores have a small curvature radius and a long length, making the tool string poorly passable or difficult to pass through. Therefore, for such a wellbore inner diameter, a smaller diameter setting tool is required, and the setting tool is also required to be short. Currently, construction generally adopts a two-trip construction method to shorten the length of the single-run gun string to ensure that it can pass through the wellbore with a small curvature radius. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art, the embodiments of the present application propose a disposable bridge plug setting tool to solve the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A disposable bridge plug sealing tool, the main structure of which is composed of an ignition assembly, a powder chamber body, a shear pin, a limiting ring, a push cylinder body, a connecting rod, an inner sealing ring, a working chamber, a pressure transmission hole, a pressure relief hole, etc. The ignition assembly is connected to the input end of the powder chamber body through a threaded sealing ring, and the output end of the powder chamber body is connected to the connecting rod through a thread, forming a powder chamber body assembly. The push cylinder body passes through the output end of the connecting rod of the powder chamber body assembly, is sleeved on the powder chamber body assembly, and is fixed by an internal step limit. The limiting ring is connected to the push cylinder body through a thread, and the shear pin is assembled on the limiting ring to realize the constraint of the push cylinder body. The output end of the right end of the powder chamber body assembly realizes the connection and fixing of the bridge plug core shaft in field applications, and the push cylinder body realizes the pushing and sealing of the bridge plug by pushing the load ring of the bridge plug. The gunpowder chamber body is connected to the connecting rod through a thread. The inner hole of the gunpowder chamber body is a straight hole. The left end of the connecting rod is a countersunk hole, which is consistent with the diameter of the inner hole of the gunpowder chamber body. An axial variable diameter large hole is designed at the pressure transmission hole at the connection to achieve smooth transmission of gas pressure.

[0006] As a further technical solution of the present invention, the disposable bridge plug setting tool ignites the powder cartridge under the ignition of the ignition assembly. The combustion generates gas that expands and performs work. The gas pressure enters the working chamber through the pressure transmission hole and acts on the inner sealing surface formed by the push tube body and the connecting rod. This inner sealing surface is sealed by two inner sealing rings. In turn, the push tube body forms a pressure-increasing resistance, ensuring that the limit ring reaches a certain threshold, shearing the shear pin. The push tube body continues to slide to the right to achieve bridge plug setting. The push tube body slides along the powder chamber body assembly to the rightmost limit position, completing bridge plug setting. At the same time, the pressure relief hole is connected to the working chamber, and the remaining gas pressure in the working chamber is completely released.

[0007] As a further technical solution of the present invention: the maximum outer diameter of the disposable bridge plug setting tool is no more than 55 mm, the length is no more than 670 mm, the output setting force is no less than 40 kN, and it can be used once.

[0008] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0009] 1. The present invention designs a disposable bridge plug setting tool with an outer diameter of no more than 55 mm and a length of no more than 670 mm.

[0010] 2. The present invention proposes a structure in which the powder chamber body and the connecting rod are compatible with each other to use the powder containing chamber, so as to shorten the length of the tool as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of the disposable bridge plug setting tool.

[0012] In the figure: ignition assembly-1, gunpowder chamber body-2, shear pin-3, limit ring-4, push cylinder body-5, connecting rod-6, inner sealing ring-7, working chamber-8, pressure transmission hole-9, pressure relief hole-10, ignition gunpowder cartridge-11. DETAILED DESCRIPTION

[0013] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] like Figure 1 As shown, a disposable bridge plug setting tool is used in the field of oil and gas well perforation operations. It is used in the bridge plug setting technology of oil and gas wells. It solves the technical problem that the bridge plug setting in the casing of a small wellbore requires two operations. It can complete the application of bridge plug setting and perforation in one run of the gun string into the well.

[0015] The main structure consists of an ignition assembly 1, a powder chamber body 2, a shear pin 3, a limiting ring 4, a push cylinder body 5, a connecting rod 6, an inner sealing ring 7, a working chamber 8, a pressure transmission hole 9, a pressure relief hole 10, etc. The ignition assembly 1 is connected to the input end of the powder chamber body 2 through a threaded sealing ring, and the output end of the powder chamber body 2 is connected to the connecting rod 6 through a thread, forming a powder chamber body assembly. The push cylinder body 5 passes through the output end of the connecting rod 6 of the powder chamber body assembly, is sleeved on the powder chamber body assembly, and is fixed by an internal step limit. The limiting ring 4 is connected to the push cylinder body 5 through a thread, and the shear pin 3 is assembled on the limiting ring 4 to realize the constraint of the push cylinder body 5. The output end of the right end of the powder chamber body assembly realizes the connection and fixing of the bridge plug core shaft in field applications, and the push cylinder body 5 realizes the pushing and sealing of the bridge plug by pushing the load ring of the bridge plug. The gunpowder chamber body 2 is connected to the connecting rod 6 through a thread. The inner hole of the gunpowder chamber body 2 is a straight hole. The left end of the connecting rod 6 is a countersunk hole, which is consistent with the diameter of the inner hole of the gunpowder chamber body 2. An axial variable diameter large hole is designed at the pressure transmission hole 9 at the connection to achieve smooth transmission of gas pressure.

[0016] Under the ignition action of the ignition assembly 1, the disposable bridge plug setting tool ignites the gunpowder cartridge 11, and the combustion generates gas expansion to do work. The gas pressure enters the working chamber 8 through the pressure transmission hole 9, acting on the inner sealing surface formed by the push tube body 5 and the connecting rod 6. The inner sealing surface is sealed by two inner sealing rings 7, and then the push tube body forms a pressure-raising resistance, ensuring that the limit ring 4 reaches a certain threshold, shearing the shear pin 3. The push tube body 5 continues to slide to the right to achieve bridge plug setting. The push tube body 5 slides along the gunpowder chamber body assembly to the rightmost limit position, ending the bridge plug setting. At the same time, the pressure relief hole 10 is connected to the working chamber 8, and the remaining gas pressure in the working chamber 8 is completely released to the outside of the tool.

[0017] The maximum outer diameter of the disposable bridge plug setting tool is no more than 55mm, the length is no more than 670mm, the output setting force is no less than 40kN, and it can be used once.

[0018] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0019] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation methods that are easy for those skilled in the art to understand.

Claims

1. A disposable bridge plug setting tool, comprising an ignition assembly (1), a powder chamber body (2), a shear pin (3), a stop ring (4), a push cylinder body (5), a connecting rod (6) and a pressure transmission hole (9), characterized in that: The ignition assembly (1) is connected to the input end of the powder chamber body (2) through a threaded sealing ring, and the output end of the powder chamber body (2) is connected to the connecting rod (6) through a thread, forming a powder chamber body assembly. The push cylinder body (5) passes through the output end of the connecting rod (6) of the powder chamber body assembly, is sleeved on the powder chamber body assembly, and is fixed by an internal step limit. The limit ring (4) is connected to the push cylinder body (5), and the shear pin (3) is assembled on the limit ring (4) to realize the constraint of the push cylinder body (5). The powder chamber body (2) is connected to the connecting rod (6). The inner hole of the powder chamber body (2) is a straight hole. The left end of the connecting rod (6) is a countersunk hole with the same diameter as the inner hole of the powder chamber body (2). An axial variable diameter large hole is designed at the pressure transmission hole (9) at the connection to realize smooth gas pressure transmission.

2. A disposable bridge plug setting tool according to claim 1, characterized in that: The limiting ring (4) is connected to the push cylinder body (5) via threads.

3. The disposable bridge plug setting tool according to claim 1, characterized in that: The powder chamber body (2) is connected to the connecting rod (6) via a thread.

4. The disposable bridge plug setting tool according to claim 1, characterized in that: The output end at the right end of the powder chamber body assembly realizes the function of connecting and fixing the bridge plug core shaft in field applications, and the push cylinder body (5) realizes the function of pushing the load ring of the bridge plug to seal the bridge plug.

5. The disposable bridge plug setting tool according to claim 2, characterized in that: Under the ignition action of the ignition assembly (1), the gunpowder cartridge (11) is ignited, combustion generates gas expansion and works, and the gas pressure enters the work chamber (8) through the pressure transmission hole (9), and acts on the inner sealing surface formed by the push cylinder body (5) and the connecting rod (6). The inner sealing surface is sealed by two inner sealing rings (7), and then the push cylinder body forms a pressure resistance, ensuring that the limit ring (4) reaches a certain threshold, shearing the shear pin (3), and the push cylinder body (5) continues to slide to the right to achieve the setting of the bridge plug.

6. The disposable bridge plug setting tool according to claim 3, characterized in that: The push cylinder body (5) slides along the powder chamber body assembly to the rightmost limit position, ending the bridge plug setting. At the same time, the pressure relief hole (10) is connected to the working chamber (8), and the remaining gas pressure in the working chamber (8) is completely released.

7. The disposable bridge plug setting tool according to claim 3, characterized in that: The maximum outer diameter of the push cylinder body (5) is not greater than 55 mm, the length is not greater than 670 mm, and the output setting force is not less than 40 kN.

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