A helical synergistic perforating gun

Abstract

The utility model relates to a spiral synergism perforating gun relates to perforating technical field. The utility model discloses a positioning sleeve, perforating gun body, sleeve powder and long tube, is equipped with spiral ring groove on the outside of perforating gun body, and the inside is provided with the cavity of containing perforating bullet, and the helical pitch of spiral ring groove is consistent with perforating bullet hole, and the rotation direction is consistent with the phase distribution rotation direction of perforating bullet, the long tube is sleeved on the perforating gun body, and the annular cavity is formed between long tube and perforating gun body, and the sleeve powder is injected in annular cavity, the positioning sleeve is sleeved on the left side of perforating gun body, is used for positioning long tube, guarantees that long tube and perforating gun body left end keep certain distance, just cross the spiral ring groove of the leftmost end of perforating gun body. The utility model sleeve powder and gun body are the whole structure, and the surface of gun body is equipped with spiral ring groove, does not exist fixed not firm condition, and the gun string is in the process of lowering in the well tube, and sleeve powder will not displace under the impact of well fluid, and the perforating bullet jet will completely ignite sleeve powder and detonate.

Description

Technical Field

[0001] This utility model relates to the field of perforation technology, specifically a spiral-enhanced perforation gun. Background Technology

[0002] Traditional sleeve-type composite perforating guns are made by prefabricating cylindrical gunpowder cartridges or rectangular gunpowder sheets of a certain thickness, which are then wrapped around the outside of the perforating gun. The gunpowder is ignited a second time by the perforating projectile jet. The sleeve gunpowder explodes in the well fluid in the annulus between the perforating gun and the wellbore. After establishing a high-pressure and high-temperature environment through its own explosion, it performs work on the perforation channel, scours the perforation channel, removes rock debris from the perforation channel, deepens and widens the perforation channel, and forms multiple fractures at or around the perforation diameter, thereby increasing oil and gas production.

[0003] Since the gunpowder sleeves that are fitted or wrapped around the outside of the perforating gun are all prefabricated, they are fitted or wrapped around the outside of the perforating gun at the perforation site and fixed with clamps at both ends of the gunpowder sleeves.

[0004] The disadvantages and shortcomings of the above methods are as follows: 1. When the gunpowder sleeve is placed over or wrapped around the outside of the perforating gun, a certain gap inevitably forms between it and the outer wall of the perforating gun. This gap is filled with well fluid, which has a significant impact on the ignition of the gunpowder sleeve by the perforating projectile jet. This reduces the initiation energy of the perforating projectile jet, resulting in insufficient initiation energy and causing the gunpowder sleeve to fail to detonate normally.

[0005] 2. The gun string has a certain speed during the lowering process in the wellbore. The existence of this gap will allow well fluid to seep into it, causing the gunpowder in the sleeve to be damaged by impact.

[0006] 3. The clamps used to fix the gunpowder at both ends of the sleeve are usually fixed in the outer blind hole recess of the gun body by hollow screw plugs. They are very easy to be accidentally fired by the jet of the perforation hole. Once accidentally fired, the clamp will break and cause the perforation gun to get stuck in the well.

[0007] 4. If the clamp is not securely fastened, the gun string will be impacted by the well fluid during the lowering process inside the well, causing the gunpowder in the sleeve to shift. When the shift leads to the position of the unperforated projectile, the gunpowder in the sleeve will not be able to ignite and detonate.

[0008] 5. On-site construction is complicated and labor-intensive. Utility Model Content

[0009] The purpose of this invention is to design a spiral-enhanced perforating gun that can solve at least one of the technical problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides a spiral-enhanced perforating gun, comprising: a positioning sleeve, a perforating gun body, sleeve gunpowder, and a long tube; the outer side of the perforating gun body is provided with a spiral annular groove, and the inner side is provided with a cavity for accommodating the perforating projectile, the pitch of the spiral annular groove being consistent with the perforation hole of the perforating projectile, and the spiral direction being consistent with the spiral direction of the phase distribution of the perforating projectile; the long tube is fitted onto the perforating gun body, and an annular cavity is formed between the long tube and the perforating gun body, and sleeve gunpowder is injected into the annular cavity; the positioning sleeve is fitted onto the left side of the perforating gun body to position the long tube, ensuring that the long tube maintains a certain distance from the left end of the perforating gun body, exactly passing over the spiral annular groove at the leftmost end of the perforating gun body.

[0011] Furthermore, the long cylinder includes a lower mold and an upper mold, which are connected by hexagonal socket screws, and a feed port is provided at the middle position of both the lower mold and the upper mold.

[0012] Furthermore, a sealing gasket is provided in the gap between the lower mold and the upper mold.

[0013] Furthermore, the positioning sleeve is a cylindrical body with a certain length and thickness and closed at one end, and its inner diameter is larger than the outer diameter of the firing gun body.

[0014] The beneficial effects of this utility model are as follows: (1) This utility model can completely eliminate the gap between the gunpowder in the sleeve outside the perforating gun body and the outer wall of the perforating gun body, ensuring the detonation energy when the perforating projectile jet ignites the gunpowder in the sleeve, so that the gunpowder in the sleeve can detonate normally.

[0015] (2) Since the sleeve gunpowder and the perforation gun body are an integral structure without gaps, the well fluid will not seep into it during the lowering process in the wellbore, thus causing the sleeve gunpowder to be damaged by impact.

[0016] (3) Without using the fixing clamps at both ends of the sleeve gunpowder, the perforating gun will not get stuck in the well if the perforating jet is accidentally fired.

[0017] (4) Since the sleeve gunpowder and the perforation gun body are an integral structure and the surface of the gun body is provided with a spiral ring groove, there is no situation of unreliable fixation. During the process of the gun string being lowered into the well, the sleeve gunpowder will not be displaced by the impact of the well fluid. The perforation jet will completely ignite and detonate the sleeve gunpowder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Cross-sectional view; Figure 3 This is a schematic diagram of the present invention; Figure 4 This is a structural diagram of the positioning sleeve of this utility model; Figure 5 This is a structural diagram of the perforation gun body of this utility model; Figure 6 This is a diagram showing the fit between the lower mold and the upper mold of this utility model.

[0019] In the diagram: 1-positioning sleeve, 2-perforation gun body, 3-sleeve gunpowder, 4-spiral ring groove, 5-lower die, 6-internal hex screw, 7-sealing gasket, 8-upper die, 9-feed pipe, 10-feed port, 11-spiral propeller, 12-coupling, 13-gear motor. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0025] See Figure 1-6 This embodiment discloses a spiral-enhanced perforating gun, comprising: a positioning sleeve 1, a perforating gun body 2, a sleeve-type gunpowder 3, and a long tube; the outer side of the perforating gun body 2 is provided with a spiral annular groove 4, and the inner side is provided with a cavity for accommodating the perforating projectile. The pitch of the spiral annular groove 4 is consistent with the perforation hole of the perforating projectile, and the spiral direction is consistent with the spiral direction of the phase distribution of the perforating projectile; the long tube is fitted onto the perforating gun body 2, and an annular cavity is formed between the long tube and the perforating gun body 2, and the sleeve-type gunpowder 3 is injected into the annular cavity; the positioning sleeve 1, the perforating gun body 2, the sleeve-type gunpowder 3, and the long tube are provided with a spiral annular groove 4, and the sleeve-type gunpowder 3 is provided with a sleeve-type gunpowder 3 ... Positioning sleeve 1 is fitted onto the left side of the perforation gun body 2 to position the long barrel, ensuring that the long barrel maintains a certain distance from the left end of the perforation gun body, just past the leftmost spiral groove 4 of the perforation gun body 2, without going too far. If positioning sleeve 1 is not present, the long barrel will be located at the threaded end of the left end of the perforation gun body 2, causing the sleeve gunpowder 3 to also be located there. After the sleeve gunpowder 3 burns, the gas pressure generated will make it difficult to disassemble the connector connected to the threaded end of the left end of the perforation gun body 2.

[0026] Among them, the perforation gun body 2 has a load-bearing function and is filled with perforation bullets. It is a cylindrical steel tube of a certain length, with internal threads and sealing surfaces at both ends. Its outer surface is machined with regular spiral annular grooves of fixed depth and width. The depth of the spiral annular grooves ensures the bearing pressure of the gun body downhole, and the width can accommodate the perforation hole diameter.

[0027] The sleeve gunpowder 3 is an energetic material that can be ignited by the jet stream of the perforation projectile and continues to burn in the well environment. Before prefabrication, it is a mixture of paste-like energetic material and curing agent. After curing, it becomes an integral part of the outer wall of the perforation gun body 2.

[0028] The long cylinder includes a lower mold 5 and an upper mold 8. The lower mold 5 and the upper mold 8 are connected by hexagonal screws 6 to form a round long cylinder. Both ends are provided with plugs, and the center of the plugs is a through hole. A feed port 10 is provided in the middle of the lower mold 5 and the upper mold 8 for the paste-like energetic material to enter its cavity.

[0029] To further optimize the technical solution, a sealing gasket 7 is provided in the gap between the lower mold 5 and the upper mold 8. The sealing gasket 7 is strip-shaped and elastic, and serves to seal the gap between the lower mold 5 and the upper mold 8.

[0030] To further optimize the technical solution, the positioning sleeve 1 is a cylindrical body with a certain length and thickness and one end closed. Its inner diameter is slightly larger than the outer diameter of the firing gun body 2, so that it can be easily fitted onto the firing gun body 2.

[0031] To further optimize the technical solution, this utility model uses a screw propeller 11 for feeding. The screw propeller 11 has the function of conveying materials when rotating. The feeding shaft of the screw propeller 11 is connected to a coupling 12, and the coupling 12 is connected to the output end of the geared motor 13. The feed pipe 9 is a corrosion-resistant and pressure-resistant steel wire wound rubber hose, with one end connected to the feed inlet 10 of the lower mold 5 and the upper mold 8 respectively, and the other end connected to the screw propeller 11.

[0032] The manufacturing method of this utility model includes: The lower mold 5 and the upper mold 8 are connected by hexagonal screws 6 to form a long cylinder, which is fitted onto the perforation gun body 2. The positioning sleeve 1 is fitted onto the left end of the perforation gun body 2 to position the long cylinder. Place the paste-like gunpowder into the screw propeller 11, start the geared motor 13, and drive the screw propeller 11 to rotate via the coupling 12. The paste-like gunpowder is squeezed into the cavity between the lower mold 5 and the upper mold 8 through the feed pipe 9, the feed port 10 of the lower mold 5, and the feed port 10 of the upper mold 8. When the paste-like gunpowder overflows from the gap between the lower mold 5 and the upper mold 8 and the firing gun body 2, it means that the paste-like gunpowder has filled the cavity between the lower mold 5 and the upper mold 8. At this time, stop the geared motor 13, remove the feed pipe 9 from the feed port 10, and after curing at room temperature for 24 hours, disassemble and remove the lower mold 5 and the upper mold 8, and trim the rough edges of the sleeve gunpowder 3.

[0033] This invention completely eliminates the gap between the outer sleeve propellant and the outer wall of the perforating gun body, ensuring the detonation energy when the perforating projectile ignites the sleeve propellant and allowing it to detonate normally. Because the sleeve propellant and the perforating gun body are an integral structure with no gaps, well fluid will not seep into the well during the descent process, preventing the sleeve propellant from being damaged by impact. Without the use of fixing clamps at both ends of the sleeve propellant, accidental firing of the perforating projectile will not cause the perforating gun to become stuck in the well. Since the sleeve propellant and the perforating gun body are an integral structure, and the gun body surface has spiral grooves, there is no issue of insecure fixing. During the descent of the gun string inside the well, the impact of the well fluid will not cause displacement of the sleeve propellant, and the perforating projectile will completely ignite and detonate it.

[0034] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A spiral-enhanced perforating gun, characterized in that, include: Positioning sleeve (1), perforating gun body (2), sleeve gunpowder (3), and long tube; the perforating gun body (2) has a spiral annular groove (4) on the outside and a cavity for accommodating the perforating bullet on the inside. The pitch of the spiral annular groove (4) is consistent with the hole of the perforating bullet, and the spiral direction is consistent with the spiral direction of the phase distribution of the perforating bullet; the long tube is fitted on the perforating gun body (2), and an annular cavity is formed between the long tube and the perforating gun body (2). Sleeve gunpowder (3) is injected into the annular cavity; the positioning sleeve (1) is fitted on the left side of the perforating gun body (2) to position the long tube and ensure that the long tube is at a certain distance from the left end of the perforating gun body, just passing over the spiral annular groove (4) at the leftmost end of the perforating gun body (2).

2. The spiral-enhanced perforating gun as described in claim 1, characterized in that, The long cylinder includes a lower mold (5) and an upper mold (8), which are connected by hexagonal screws (6). A feed port (10) is provided in the middle of the lower mold (5) and the upper mold (8).

3. A spiral-enhanced perforating gun as described in claim 2, characterized in that, A sealing gasket (7) is provided in the gap between the lower mold (5) and the upper mold (8).

4. A spiral-enhanced perforating gun as described in claim 1, characterized in that, The positioning sleeve (1) is a cylindrical body with a certain length and thickness and closed at one end, and its inner diameter is larger than the outer diameter of the firing gun body (2).

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