Liquid oxygen expansion fracturing device

Abstract

The utility model provides a liquid oxygen expansion fracturing device which comprises a liquid storage pipe, a first connector and a second connector are arranged at the two ends of the liquid storage pipe respectively, the first connector is connected with an exhaust pipe, a plurality of exhaust holes are formed in the exhaust pipe, an inner protection cylinder is arranged in the liquid storage pipe, and end protection pads are arranged at the two ends of the inner protection cylinder. An inner protection cylinder and an end protection pad are arranged in the liquid storage pipe, a physical isolation layer is formed on the inner wall, strong oxidation corrosion of liquid oxygen / gaseous oxygen to the metal inner wall of a liquid storage pipe body in the high-pressure and heating environment is resisted, the service life of the device is remarkably prolonged, and the safety of long-term use is guaranteed; due to the design of the inclined planes of the end protection pads and the clamping parts of the inner protection cylinder, the inner protection cylinder is convenient and reliable to mount.

Description

Technical Field

[0001] This utility model relates to the field of liquid oxygen blasting technology, specifically a liquid oxygen expansion and fracturing device. Background Technology

[0002] Liquid oxygen fracturing technology is a technique that utilizes liquid oxygen (-183℃) mixed with an absorbent to form a fracturing mixture. It leverages the property that oxygen can rapidly transform from a liquid to a gaseous state in a short time (milliseconds), with a total expansion ratio as high as 860:1. This can create a quasi-static pressure of approximately 280-300 MPa within the borehole, acting on the borehole wall to cause rock fracturing and movement.

[0003] Existing improved liquid oxygen rupture devices, such as the one with publication (announcement) number CN221924801U, suffer from the problem that the oxygen storage tank gradually corrodes under high temperature and high pressure during long-term use. They often lack effective anti-corrosion measures, and the constant pressure rupture mechanism is complex in design and inconvenient to replace. Utility Model Content

[0004] The purpose of this invention is to provide a liquid oxygen expansion fracturing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquid oxygen expansion fracturing device, comprising a liquid storage tube, wherein a first connector and a second connector are respectively provided at both ends of the liquid storage tube, the first connector is connected to an exhaust pipe, the exhaust pipe is provided with a plurality of exhaust holes, an inner protective cylinder is provided inside the liquid storage tube, and end protective pads are provided at both ends of the inner protective cylinder.

[0006] Preferably, both the first connector and the second connector are provided with threaded joints.

[0007] Preferably, the end protective pad includes a pad body, the pad body is provided with an inclined surface, and the end of the inclined surface is provided with an inner protective cylinder engaging part.

[0008] Preferably, the inner diameter of the end protective pad is smaller than the outer diameter of the threaded joint of the second connector.

[0009] Preferably, a constant pressure shearing plate is provided inside the first connector.

[0010] Preferably, the first connector has an inner retaining ring inside, a pressure ring on one side of the inner retaining ring, and the edge of the constant pressure shearing plate is located between the inner retaining ring and the pressure ring.

[0011] Preferably, the first connector has an internal thread, the outer surface of the pressure ring has an external thread, and the pressure ring is screwed into the first connector.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. By setting an inner protective cylinder and an end protective pad inside the liquid storage tube, a physical isolation layer is formed on the inner wall to resist the strong oxidation corrosion of the main metal inner wall of the liquid storage tube by liquid oxygen / gas oxygen under high pressure and heating environment, which significantly extends the service life of the device and ensures the safety of long-term use.

[0013] The beveled end of the protective pad and the snap-fit ​​design of the inner protective cylinder make the installation of the inner protective cylinder convenient and reliable.

[0014] 2. The constant pressure shearing disc is pressed and fixed by an inner retaining ring and a threaded pressure ring. The structure is simple and sturdy, and the operation of replacing the shearing disc is extremely convenient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the first connector structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the liquid storage tube of this utility model;

[0019] Figure 5 This is a schematic diagram of the end protective pad structure of this utility model.

[0020] In the diagram: 1. Liquid storage pipe; 2. First connector; 3. Second connector; 4. Exhaust pipe; 5. Exhaust port; 6. Tip; 7. Heater; 8. Inner retaining ring; 9. Constant pressure shear plate; 10. Pressure ring; 11. Inner protective cylinder; 12. End protective pad; 121. Pad body; 122. Inclined surface; 123. Inner protective cylinder locking part. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 5This utility model provides a technical solution: a liquid oxygen expansion and fracturing device, including a liquid storage pipe 1, with a first connector 2 and a second connector 3 respectively provided at both ends of the liquid storage pipe 1. Both ends of the first connector 2 and the second connector 3 are provided with threaded joints. One end of the first connector 2 is connected to an exhaust pipe 4 and the other end is connected to the liquid storage pipe 1. The exhaust pipe 4 is provided with a plurality of exhaust holes 5 and a pointed tip 6 at the end of the exhaust pipe 4. A heater 7 is also provided inside the liquid storage pipe 1. A constant pressure shear plate 9 is provided inside the first connector 2. The device is assembled and placed into a pre-prepared drill hole. Then, liquid oxygen is filled into the liquid storage pipe 1, and the heater 7 is activated. The liquid oxygen expands due to heat, and the constant pressure shear plate 9 is subjected to pressure and ruptures. The expanded liquid oxygen enters the exhaust pipe 4 and releases pressure rapidly through the exhaust holes 5 to cause an explosion.

[0023] As one embodiment of this application, such as Figure 4 and Figure 5 As shown, liquid oxygen is stored in a high-pressure storage tube 1 and needs to be heated for detonation. The high pressure and heating environment may accelerate the corrosion of the cylinder by the oxygen. Therefore, an inner protective cylinder 11 is installed inside the storage tube 1, and end protective pads 12 are installed at both ends of the inner protective cylinder 11. The inner protective cylinder 11 protects the inner wall of the storage tube 1, and the end protective pads 12 protect the inner end of the storage tube 1.

[0024] Specifically, the end protective pad 12 includes a pad body 121, with an inclined surface 122 on the pad body 121 and an inner protective cylinder engaging part 123 at the end of the inclined surface 122. In use, the end protective pad 12 is first inserted into the two ends of the inner cavity of the liquid storage tube 1, and then the inner protective cylinder 11 is bent and inserted into the liquid storage tube 1. The inclined surface 122 causes the inner protective cylinder 11 to slide outward, so that the end of the inner protective cylinder 11 is engaged in the inner protective cylinder engaging part 123.

[0025] Specifically, the inner diameter of the end protective pad 12 is smaller than the outer diameter of the threaded joint of the second connector 3. After the liquid storage tube 1 is connected to the second connector 3, the end protective pad 12 can block the connection gap between the liquid storage tube 1 and the second connector 3, so that the end protective pad 12 also has a sealing function and improves the sealing effect.

[0026] As one embodiment of this application, such as Figure 3 As shown, an installation structure for a constant pressure shearing plate 9 is provided. An inner retaining ring 8 is provided inside the first connector 2, and a pressure ring 10 is provided on one side of the inner retaining ring 8. An internal thread is provided inside the first connector 2, and an external thread is provided on the outer side of the pressure ring 10. The pressure ring 10 is screwed into the first connector 2, and the edge of the constant pressure shearing plate 9 is located between the inner retaining ring 8 and the pressure ring 10. During installation, simply insert the constant pressure shearing plate 9 and then tighten the pressure ring 10, which is very convenient.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid oxygen expansion-induced fracturing device, characterized in that, The utility model provides an exhaust pipe and liquid storage pipe, which comprises a liquid storage pipe (1), a first connecting head (2) and a second connecting head (3) are arranged at both ends of the liquid storage pipe (1) respectively, the first connecting head (2) is connected with an exhaust pipe (4), a plurality of exhaust holes (5) are arranged on the exhaust pipe (4), an inner protection cylinder (11) is arranged in the liquid storage pipe (1), end protection pads (12) are arranged at both ends of the inner protection cylinder (11).

2. The liquid oxygen expansion-induced fracturing device according to claim 1, characterized in that: The first connecting head (2) and the second connecting head (3) are provided with threaded joints.

3. The liquid oxygen expansion fracturing device of claim 1, wherein: The end protection pad (12) comprises a pad body (121), an inclined surface (122) is arranged on the pad body (121), and an inner protection cylinder clamping portion (123) is arranged at the end of the inclined surface (122).

4. The liquid oxygen expansion fracturing device of claim 2, wherein: The inner diameter of the end protection pad (12) is smaller than the outer diameter of the threaded joint of the second connecting head (3).

5. The liquid oxygen expansion fracturing device of claim 1, wherein: The first connecting head (2) is internally provided with a constant pressure shear piece (9).

6. The liquid oxygen expansion fracturing device of claim 5, wherein: The first connecting head (2) is internally provided with an inner retaining ring (8), one side of the inner retaining ring (8) is provided with a compression ring (10), and the edge of the constant pressure shear piece (9) is arranged between the inner retaining ring (8) and the compression ring (10).

7. The liquid oxygen expansion fracturing device of claim 6, wherein: The first connecting head (2) is internally provided with an inner thread, the outer side surface of the compression ring (10) is provided with an outer thread, and the compression ring (10) is screwed in the first connecting head (2).

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