Composite energy-releasing fracturing plugging device

Abstract

The utility model provides a composite energy release fracturing plugging device, and belongs to the technical field of oil well casing perforation and fracturing. The problems that when high-pressure well fluid is used for fracturing operation in traditional fracturing operation, the high-pressure well fluid can not effectively open cracks sometimes, so that the passing resistance of crude oil is increased, the permeability of the crude oil is poor, and the oil extraction yield is reduced are solved. The utility model discloses a sieve tube gun which comprises a sieve tube gun, a gun head, a gun tail, a cartridge case and a non-explosive igniter, the gun head and the gun tail are respectively arranged at the upper end and the lower end of the sieve tube gun, the cartridge case is arranged in an inner cavity of the sieve tube gun, the non-explosive igniter is arranged at the bottom of the cartridge case, primary fuel is arranged in the non-explosive igniter, and secondary fuel is arranged in the cartridge case. The device is mainly used for oil well casing perforation and fracturing.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil well casing perforation and fracturing, and particularly relates to a composite energy-releasing fracturing plugging device. Background Technique

[0002] During the exploitation process of an oil well, after the oil well casing is perforated, a fracturing operation is required. The traditional fracturing operation is to inject a large amount of high-pressure well fluid into the oil layer through a high-pressure pump. The pressure of these fluids is sufficient to open or expand the rock fractures. When the fractures are large enough, proppants are added to keep the fractures open. In this way, the crude oil in the oil layer can flow more freely into the wellbore. However, when using high-pressure well fluid for fracturing operations, sometimes the high-pressure well fluid cannot effectively open the fractures, which increases the resistance for the crude oil to pass through, results in poor permeability of the crude oil, and leads to a reduction in oil production. Content of the Utility Model

[0003] In view of this, the utility model aims to provide a composite energy-releasing fracturing plugging device to solve the problem that when using high-pressure well fluid for traditional fracturing operations, sometimes the high-pressure well fluid cannot effectively open the fractures, which increases the resistance for the crude oil to pass through, results in poor permeability of the crude oil, and leads to a reduction in oil production.

[0004] To achieve the above object, the utility model adopts the following technical solutions: A composite energy-releasing fracturing plugging device, which includes a screen pipe gun, a gun head, a gun tail, a cartridge, and a non-explosive igniter. The gun head and the gun tail are respectively arranged at the upper and lower ends of the screen pipe gun. The cartridge is arranged in the inner cavity of the screen pipe gun. The non-explosive igniter is arranged at the bottom of the cartridge. The non-explosive igniter is provided with a primary fuel, and the cartridge is provided with a secondary fuel.

[0005] Furthermore, the non-explosive igniter includes an igniter outer cylinder, a resistance wire, and a power cord. The igniter outer cylinder is arranged at the bottom of the cartridge. The resistance wire is arranged in the igniter outer cylinder and is connected to the power cord. The primary fuel is arranged in the igniter outer cylinder.

[0006] Furthermore, the internal thread at the lower end of the gun head is connected to the external thread at the upper end of the cartridge. The external thread at the lower end of the gun head is connected to the internal thread at the upper end of the screen pipe gun. A upper sealing ring is sleeved at the threaded connection between the gun head and the cartridge.

[0007] Furthermore, upper and lower end caps are respectively arranged at the upper and lower ends of the cartridge.

[0008] Furthermore, one end of the power cord is connected to the resistance wire, and the other end passes through the cartridge, the upper end cap, and the gun head in sequence and extends to the outside.

[0009] Further, the external thread of the lower head is connected to the internal thread at the lower end of the cartridge, and a lower sealing ring is sleeved at the threaded connection between the lower head and the cartridge.

[0010] Further, an anti-detachment pin is provided between the lower head and the cartridge. A side hole is formed in the side wall at the lower end of the cartridge, and one end of the anti-detachment pin passes through the side hole and is in contact and cooperation with the lower head.

[0011] Further, the external thread at the upper end of the gun tail is connected to the internal thread at the lower end of the screen pipe gun.

[0012] Further, a pressure gauge device is connected to the lower end of the gun tail.

[0013] Further, the primary fuel is a non-explosive high-temperature agent, and the secondary fuel is a composite energy-releasing fuel.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model provides a composite energy-releasing pressure fracture plugging device. After the primary fuel in the non-explosive igniter burns when the non-explosive igniter is energized, the released high-temperature flame ignites the composite energy-releasing fuel in the cartridge to release high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the casing annulus through the screen pipe gun and is released to generate a high-pressure impact on the well fluid in the casing annulus. The high-pressure well fluid enters the perforation channel to perform a fracturing and slotting operation.

[0016] 2. The present utility model provides a composite energy-releasing pressure fracture plugging device. The pressure released by this device is high. Under the action of the high-pressure gas, the high-pressure well fluid enters the perforation channel and effectively opens and expands the rock fractures, reducing the resistance for the crude oil to pass through and increasing the permeability of the crude oil, effectively improving the oil production efficiency and oil production output. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings that form a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 is the overall structural schematic diagram of a composite energy-releasing pressure fracture plugging device described in the present utility model;

[0019] Figure 2 is the partial structural enlarged view of a composite energy-releasing pressure fracture plugging device described in the present utility model;

[0020] Figure 3 is the partial structural enlarged view of a composite energy-releasing pressure fracture plugging device described in the present utility model.

[0021] 1 - Gun head, 2 - Upper sealing ring, 3 - Cartridge, 4 - Screen pipe gun, 5 - Non - explosive igniter, 6 - Primary fuel, 7 - Lower head, 8 - Lower sealing ring, 9 - Anti - detachment pin, 10 - Gun tail, 11 - Power cord, 12 - Pressure gauge device, 13 - Upper head, 14 - Secondary fuel, 15 - Resistance wire. Detailed implementation mode

[0022] The following will clearly and completely elaborate on the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. It should be noted that, without conflict, the embodiments and the features in the embodiments of the present utility model can be combined with each other. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] See Figures 1-3 In this embodiment, a composite energy - releasing pressure - cracking plugging device includes a screen pipe gun 4, a gun head 1, a gun tail 10, a cartridge 3 and a non - explosive igniter 5. The gun head 1 and the gun tail 10 are respectively arranged at the upper and lower ends of the screen pipe gun 4. The cartridge 3 is arranged in the inner cavity of the screen pipe gun 4. The non - explosive igniter 5 is arranged at the bottom of the cartridge 3. The non - explosive igniter 5 is internally provided with a primary fuel 6, and the cartridge 3 is internally provided with a secondary fuel 14.

[0024] In this embodiment, the non - explosive igniter 5 includes an igniter outer cylinder, a resistance wire 15 and a power cord 11. The igniter outer cylinder is arranged at the bottom of the cartridge 3. The resistance wire 15 is arranged in the igniter outer cylinder and is connected to the power cord 11. The primary fuel 6 is arranged in the igniter outer cylinder.

[0025] In this embodiment, the internal thread at the lower end of the gun head 1 is connected to the external thread at the upper end of the cartridge 3. The external thread at the lower end of the gun head 1 is connected to the internal thread at the upper end of the screen pipe gun 4. A upper sealing ring 2 is sleeved at the threaded connection between the gun head 1 and the cartridge 3. The upper sealing ring 2 is used to ensure the sealing between the gun head 1 and the cartridge 3.

[0026] In this embodiment, both the cartridge 3 and the igniter outer cylinder are made of non - metallic materials.

[0027] After perforating the oil well casing, it is necessary to perform pressure cracking and plugging removal on the perforation channels. In this embodiment, the composite energy-releasing pressure cracking and plugging removal device is lowered into the well by a cable and hovers at a position corresponding to the perforation section. Ground operation transmits current to the non-explosive igniter 5 in the downhole composite energy-releasing pressure cracking and plugging removal device through the cable and the power line 11. The resistance wire 15 in the non-explosive igniter 5 generates a high heat point through the current to ignite the primary fuel in the igniter outer cylinder. The burning primary fuel 6 directly ignites the secondary fuel 14 in the cartridge 3 after passing through the non-metallic structure of the igniter outer cylinder. The secondary fuel 14 burns to generate high-temperature and high-pressure flame gas to burn through the non-metallic cartridge 3. The high-pressure gas is released into the casing annulus through the screen pipe gun 4 to generate a high-pressure impact on the well fluid in the casing annulus. The high-pressure well fluid enters the perforation channels for pressure cracking and plugging removal.

[0028] In this embodiment, upper and lower end caps 13 and 7 are respectively arranged at the upper and lower ends of the cartridge 3. The upper end cap 13 and the lower end cap 7 are used to seal and block both ends of the cartridge 3.

[0029] In this embodiment, one end of the power line 11 is connected to the resistance wire 15, and the other end sequentially passes through the cartridge 3, the upper end cap 13, and the gun head 1 and extends to the outside. In this embodiment, the power line 11 is two wires led out from inside the non-explosive igniter 5. One of them is tied to the inner hole wall of the upper end of the gun head 1 to be grounded, and the other is led out and contacts the cable connector. Power is supplied to the downhole through the cable from the ground.

[0030] In this embodiment, the external thread of the lower end cap 7 is connected to the internal thread at the lower end of the cartridge 3. A lower sealing ring 8 is sleeved at the threaded connection between the lower end cap 7 and the cartridge 3. The lower sealing ring 8 is used to ensure the sealing between the lower end cap 7 and the cartridge 3.

[0031] In this embodiment, an anti-loosening pin 9 is arranged between the lower end cap 7 and the cartridge 3. A side hole is opened on the side wall at the lower end of the cartridge 3. One end of the anti-loosening pin 9 passes through the side hole and is in contact and cooperation with the lower end cap 7. The anti-loosening pin 9 ensures the connection strength between the lower end cap 7 and the cartridge 3.

[0032] In this embodiment, the external thread at the upper end of the gun tail 10 is connected to the internal thread at the lower end of the screen pipe gun 4. The gun tail 10 and the screen pipe gun 4 are connected by threads.

[0033] In this embodiment, a pressure gauge device 12 is connected to the lower end of the gun tail 10. In this device, the pressure gauge device 12 is used to monitor the gas pressure in the fracturing gun in real time and accurately control the fracturing pressure, which can maximize the length and width of the fracture, thereby increasing the oil and gas production. The pressure gauge provides the necessary data for engineers to adjust the fracturing process to obtain the best results and ensures the safety and effectiveness of the fracturing operation.

[0034] In this embodiment, the primary fuel 6 is a non-explosive high heat agent, and the secondary fuel 14 is a composite energy-releasing fuel. The composite energy-releasing fuel is an energetic composite material. The components of the non-explosive high heat agent and the energetic composite material are all prior arts and will not be elaborated herein.

[0035] The application structure of this device is reasonable, and it is a safe and reliable composite energy-releasing pressure splitting and plugging technology. It has a high release pressure, achieving the actual effect of fracturing and creating fractures in the perforation channels to remove blockages and increasing crude oil production. It can also be used for pressure splitting and plugging of the casing channels of old wells. The ratio and dosage of the composite energy-releasing fuel can be adjusted according to the geological structure of each well.

[0036] The embodiments of the present utility model disclosed above are only used to help explain the present utility model. The embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. According to the content of this specification, many modifications and variations can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present utility model, so that those skilled in the art can well understand and utilize the present utility model.

Claims

1. A composite energy-releasing compression and plugging device, characterized in that: It comprises a screen tube gun (4), a gun head (1), a gun tail (10), a cartridge (3) and a non-explosive igniter (5), wherein the gun head (1) and the gun tail (10) are respectively arranged at the upper and lower ends of the screen tube gun (4), the cartridge (3) is arranged in the inner cavity of the screen tube gun (4), the non-explosive igniter (5) is arranged at the bottom of the cartridge (3), a primary fuel (6) is arranged in the non-explosive igniter (5), and a secondary fuel (14) is arranged in the cartridge (3).

2. A composite energy-releasing compression and plugging device according to claim 1, characterized in that: The non-explosive igniter (5) comprises an igniter outer tube, a resistance wire (15) and a power line (11); the igniter outer tube is arranged at the bottom of the cartridge (3); the resistance wire (15) is arranged inside the igniter outer tube and connected to the power line (11); and the primary fuel (6) is arranged inside the igniter outer tube.

3. A composite energy-releasing compression and plugging device according to claim 2, characterized in that: The internal thread at the lower end of the gun head (1) is connected to the external thread at the upper end of the cartridge (3), the external thread at the lower end of the gun head (1) is connected to the internal thread at the upper end of the screen gun (4), and an upper sealing ring (2) is sleeved at the threaded connection between the gun head (1) and the cartridge (3).

4. A composite energy-releasing compression and plugging device according to claim 3, characterized in that: An upper sealing head (13) and a lower sealing head (7) are respectively arranged at the upper and lower ends of the cartridge (3).

5. The composite energy-releasing compression and plugging device according to claim 4, characterized in that: One end of the power line (11) is connected to the resistance wire (15), and the other end passes through the cartridge (3), the upper sealing head (13) and the gun head (1) in sequence and extends to the outside.

6. The composite energy-releasing compression and plugging device according to claim 4, characterized in that: The external thread of the lower sealing head (7) is connected to the internal thread of the lower end of the cartridge (3), and a lower sealing ring (8) is sleeved at the threaded connection between the lower sealing head (7) and the cartridge (3).

7. A composite energy-releasing compression and plugging device according to claim 6, characterized in that: An anti-dropout pin (9) is provided between the lower sealing head (7) and the cartridge (3), a side hole is provided on the side wall of the lower end of the cartridge (3), and one end of the anti-dropout pin (9) passes through the side hole and contacts and cooperates with the lower sealing head (7).

8. The composite energy-releasing compression and plugging device according to claim 1, characterized in that: The external thread at the upper end of the gun tail (10) is connected to the internal thread at the lower end of the screen gun (4).

9. The composite energy-releasing compression and plugging device according to claim 1, characterized in that: The lower end of the gun tail (10) is connected to a pressure gauge device (12).

10. The composite energy-releasing compression and plugging device according to claim 1, characterized in that: The primary fuel (6) is a non-explosive high-temperature agent, and the secondary fuel (14) is a composite energy-releasing fuel.

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