Carbon dioxide fracturing device with flying stopping device

Abstract

The utility model discloses a carbon dioxide fracturing device with a flying stopping device, which comprises a fracturing device body which is cylindrical on the whole, a cavity is arranged in the fracturing device body, liquid carbon dioxide is filled in the cavity, and a filling head used for filling the liquid carbon dioxide into the cavity is arranged at the front end of the fracturing device body. A cavity is formed in the fracturing device body, a heating pipe extending into the cavity is arranged on the front side of the fracturing device body, an energy release channel communicated with the rear end of the cavity is formed in the fracturing device body, a constant-pressure shearing piece used for sealing a front end opening of the energy release channel is arranged at the rear end of the cavity, the flying stopping device is arranged at the rear end of the fracturing device body, and a power input end at the front end of the flying stopping device is communicated with the rear end of the energy release channel. The fracturing device is simple and convenient to operate, the working efficiency is greatly improved, the fracturing device and the rock mass are jacked into a whole by utilizing the impact force of high-pressure airflow during blasting, the phenomenon of pipe flying is effectively avoided, and the fracturing device has important significance on the safety of field work and the improvement of the working efficiency and the economic benefit, and can be suitable for larger hole diameter range of blast holes.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering technology, specifically relating to a carbon dioxide fracturing device with a built-in anti-flight device. Background Technology

[0002] With the development of the times, the requirements for rock breaking technology in engineering are becoming increasingly higher, especially the requirements for safety measures in rock breaking. The control of explosives is now more stringent. Traditional explosive rock breaking technology is subject to strict regulations in both use and storage, especially in urban areas, confined spaces, or flammable and explosive environments, where the requirements are even more stringent or even prohibited.

[0003] Carbon dioxide fracturing is a technology that utilizes the phase change properties of carbon dioxide gas to fracture rock masses. The core of this technology lies in the rapid expansion of liquid carbon dioxide upon heating; this property is used to generate sufficient force to fracture the rock mass. A carbon dioxide fracturing device typically consists of a high-strength alloy steel tube, an excitation tube, an energy release assembly, a gas filling assembly, a firing circuit connection assembly, and other auxiliary components. Heating the excitation tube causes the liquid carbon dioxide to vaporize instantaneously, releasing high-pressure gas energy, thereby fracturing the rock mass. Carbon dioxide fracturing technology offers advantages such as energy saving, environmental friendliness, safety, and high efficiency, reducing construction costs and improving efficiency. Furthermore, because it does not produce sparks during fracturing, it is suitable for flammable environments such as gas-fired mines, reducing safety risks.

[0004] However, some problems exist in actual use. Because the carbon dioxide fracturing device is placed in a narrow borehole, and the venting head is located at the bottom, when high-pressure gas is released, the bottom of the fracturing device is subjected to the force of the high-pressure gas, causing it to fly out of the borehole—a phenomenon known as "flying pipe." "Flying pipe" not only wastes energy but also poses a significant safety hazard. This is especially true in confined downhole operations, where it poses a considerable safety risk to surrounding personnel and equipment. Utility Model Content

[0005] The purpose of this invention is to provide a carbon dioxide fracturing device with a built-in anti-flying device to prevent the fracturing device from flying out of the borehole during rock fracturing, thus ensuring the fracturing effect and eliminating the safety hazard of "flying pipe".

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a carbon dioxide fracturing device with a built-in anti-flight device, comprising a fracturing device body that is cylindrical in shape, a cavity inside the fracturing device body containing liquid carbon dioxide, a filling head at the front end of the fracturing device body for filling the cavity with liquid carbon dioxide, a heating tube extending into the cavity at the front side of the fracturing device body, an energy release channel communicating with the rear end of the cavity inside the fracturing device body, a constant pressure shear plate at the rear end of the cavity for sealing the front port of the energy release channel, and an anti-flight device located at the rear end of the fracturing device body, with the power input end at the front end of the anti-flight device communicating with the rear end of the energy release channel.

[0007] The energy release channel includes an axial hole opened along the center of the fracturing device body and a cross-shaped radial hole opened along the radial direction of the fracturing device body. The inner end of the radial hole is connected to the rear end of the axial hole.

[0008] The anti-flight device includes a drive guide rod and at least three anti-flight blocks evenly arranged along the circumference of the fracturing device body. A guide hole corresponding to the axial hole is opened along the center line at the rear of the fracturing device body. The drive guide rod is slidably disposed in the guide hole. A groove for accommodating and hiding the anti-flight blocks is provided on the outer circle of the rear of the fracturing device body. An installation hole is provided inside the fracturing device body to connect the guide hole with each groove. A connecting rod is provided in each installation hole. The inner end of the connecting rod is hinged to the connecting rod through a first hinge. The outer end of the connecting rod is hinged to the middle of the anti-flight block through a second hinge. The first hinge is located in front of the second hinge. The inner side of the rear end of the anti-flight block is hinged to the bottom of the rear end of the groove through a third hinge.

[0009] The front end of the anti-flying block has a sharp structure. On the body of the fracturing device, a torsion spring is provided between the rear side wall of the groove and the rear end of the anti-flying block, located outside the third hinge. The two spring arms of the torsion spring are pressed against the rear side wall of the groove and the rear end face of the anti-flying block, respectively.

[0010] Compared with existing technologies, the above technical solution has the following technical advantages:

[0011] This invention features a simple structure, convenient operation, and high safety and reliability. When inserted into a blasting hole, the fracturing device's filling head is near the hole opening. A heating element heats liquid carbon dioxide, causing it to vaporize. The resulting high-pressure gas first ruptures the constant-pressure shear plate, then releases energy through the energy release channel. Most of the energy impacts the blasting hole wall through the radial holes, fracturing the rock mass. A portion of the high-pressure gas impacts the guide rod, driving it to move backward along the guide hole. Simultaneously, the guide rod drives all the connecting rods to expand outward. The connecting rods drive the anti-flying block to rotate around the third hinge. The sharp structure at the front end of the anti-flying block opens outward, pressing against or embedding itself into the blasting hole wall, thus firmly fixing the fracturing device body in the blasting hole and preventing it from flying forward out of the hole due to the back impact of the high-pressure gas flow. After the rock-breaking operation is completed, the fracturing device is removed. Under the action of a torsion spring, the anti-flying block drives the connecting rod, which in turn drives the guide rod to move forward within the guide hole. The anti-flying block retracts and hides in the groove, allowing the fracturing device to be reused.

[0012] Another function of the torsion spring is to offset part of the impact force of the high-pressure gas, so as to prevent the anti-flying block from being deformed and damaged when it expands outward due to excessive impact force during the instantaneous explosion of the high-pressure gas.

[0013] The radial holes of the energy release channel are cross-shaped, that is, bidirectional through-hole energy release ports. When high-pressure gas is released, the radial forces on the fracturing device cancel each other out, which can effectively control the rotation of the fracturing device.

[0014] The anti-flying block is hinged to the bottom of the groove on the rear side of the fracturing device body via a third hinge. Due to the limitation of the displacement distance of the drive guide rod, the maximum extension angle of the anti-flying block is 60°.

[0015] In summary, this utility model has a scientific principle and compact structure, which simplifies the process of carbon dioxide blasting and greatly improves work efficiency. By utilizing the impact force of high-pressure airflow during blasting to integrate the fracturing device with the rock mass, it effectively avoids the "flying tube" phenomenon. It is of great significance for on-site work safety, improving work efficiency and economic benefits, and can be applied to a wider range of blasting hole diameters. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the anti-flight block of the anti-flight device of this utility model when it expands outward;

[0018] Figure 3 yes Figure 2 A top view of the anti-flight device in the middle;

[0019] Figure 4 This is a force analysis diagram of the stop block. Detailed Implementation

[0020] like Figure 1-3 As shown, the carbon dioxide fracturing device with a built-in anti-flight device of this utility model includes a fracturing device body 3 that is cylindrical in shape. The fracturing device body 3 has a cavity 2 inside, which is filled with liquid carbon dioxide. The front end of the fracturing device body 3 is provided with a filling head 1 for filling the cavity 2 with liquid carbon dioxide. The front side of the fracturing device body 3 is provided with a heating tube 4 that extends into the cavity 2. The fracturing device body 3 has an energy release channel that communicates with the rear end of the cavity 2. The rear end of the cavity 2 is provided with a constant pressure shear plate 5 for sealing the front port of the energy release channel. The anti-flight device is located at the rear end of the fracturing device body 3, and the power input end at the front end of the anti-flight device is connected to the rear end of the energy release channel.

[0021] The energy release channel includes an axial hole 6 opened along the center of the fracturing device body 3 and a cross-shaped radial hole 7 opened along the radial direction of the fracturing device body 3. The inner end of the radial hole 7 is connected to the rear end of the axial hole 6.

[0022] The anti-flight device includes a drive guide rod 8 and at least three anti-flight blocks 11 evenly arranged along the circumference of the fracturing device body 3. A guide hole 10 corresponding to the axial hole 6 is opened along the center line at the rear of the fracturing device body 3. The drive guide rod 8 is slidably disposed in the guide hole 10. A groove 9 for accommodating and hiding the anti-flight blocks 11 is provided on the outer circle of the rear of the fracturing device body 3. An installation hole 12 is provided inside the fracturing device body 3 to connect the guide hole 10 with each groove 9. A connecting rod 13 is provided in each installation hole 12. The inner end of the connecting rod 13 is hinged to the connecting rod 13 through a first hinge 14. The outer end of the connecting rod 13 is hinged to the middle of the anti-flight block 11 through a second hinge 18. The first hinge 14 is located in front of the second hinge 18. The inner rear end of the anti-flight block 11 is hinged to the bottom of the rear end of the groove 9 through a third hinge 16.

[0023] The front end of the anti-flying block 11 has a sharp structure. A torsion spring 17 located outside the third hinge 16 is provided on the body 3 of the cracker between the rear side wall of the groove 9 and the rear end of the anti-flying block 11. The two spring arms of the torsion spring 17 are pressed against the rear side wall of the groove 9 and the rear end face of the anti-flying block 11, respectively.

[0024] When this utility model is inserted into the blast hole, the filling head 1 of the fracturing device body 3 is close to the hole opening. The heating tube 4 heats the liquid carbon dioxide to raise the temperature. The liquid carbon dioxide vaporizes, and the resulting high-pressure gas first breaks through the constant pressure shear plate 5, and then releases energy through the energy release channel. Most of the energy impacts the blast hole wall 15 through the radial hole 7, causing the rock mass to fracture. A portion of the high-pressure gas impacts backward, driving the guide rod 8 to move backward along the guide hole 10. The driving guide rod 8 simultaneously drives all the connecting rods 13 to expand outward. The connecting rods 13 drive the anti-flying block 11 to rotate around the third hinge 16 as the fulcrum. The sharp structure at the front end of the anti-flying block 11 opens outward and presses against the blast hole wall 15, thereby firmly fixing the fracturing device body 3 in the blast hole, thus preventing the high-pressure gas flow from impacting the blast hole and flying forward out of the hole. After the rock breaking operation is completed, the fracturing device is removed. Under the action of the torsion spring 17, the anti-flying block 11 drives the connecting rod 13. The connecting rod 13 drives the drive guide rod 8 to move forward in the guide hole 10. The anti-flying block 11 retracts and hides in the groove 9, and the fracturing device can be reused.

[0025] Another function of the torsion spring 17 is to offset part of the impact force of the high-pressure gas, so as to prevent the anti-flying block 11 from being deformed and damaged when it expands outward due to excessive impact force during the instantaneous explosion of the high-pressure gas.

[0026] The radial hole 7 of the energy release channel is cross-shaped, that is, a bidirectional through-hole energy release port. When the high-pressure gas is released, the radial forces on the fracturing device cancel each other out, which can effectively control the rotation of the fracturing device.

[0027] The anti-flying block 11 is hinged to the bottom of the groove 9 on the rear side of the fracturing device body 3 via the third hinge 16. Due to the limitation of the displacement distance of the drive guide rod 8, the maximum extension angle of the anti-flying block 11 is 60°.

[0028] like Figure 4 As shown, the X direction is the direction of force on the drive guide rod 8, F is the magnitude of the force on the drive guide rod 8, and the force acting on the anti-flying block 11 is Fcosα. According to Newton's third law, the borehole wall 15 generates forces of equal magnitude and opposite direction. Under the combined action of the four anti-flying blocks 11, the fracturing device is constrained in the borehole.

[0029] The force analysis is as follows:

[0030] 4F·cos 2 α ≥ F (1)

[0031] α ≤ 60° (2)

[0032] Theoretical calculations show that the maximum extension angle of the anti-flying block 11 is 60°. When the angle is less than or equal to 60°, it can effectively stop the "flying pipe" phenomenon and ensure the safety of personnel and equipment.

[0033] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A carbon dioxide fracturing device with a built-in anti-flight mechanism, comprising a fracturing device body that is cylindrical in shape, an internal cavity containing liquid carbon dioxide, a filling head for filling the cavity with liquid carbon dioxide at the front end of the fracturing device body, and a heating tube extending into the cavity from the front side of the fracturing device body, characterized in that: The fracturing device body has an energy release channel inside that communicates with the rear end of the cavity. The rear end of the cavity has a constant pressure shear plate for sealing the front port of the energy release channel. The anti-flight device is located at the rear end of the fracturing device body, and the power input end at the front end of the anti-flight device is connected to the rear end of the energy release channel.

2. The carbon dioxide fracturing device with integrated anti-flight mechanism according to claim 1, characterized in that: The energy release channel includes an axial hole opened along the center of the fracturing device body and a cross-shaped radial hole opened along the radial direction of the fracturing device body. The inner end of the radial hole is connected to the rear end of the axial hole.

3. The carbon dioxide fracturing device with integrated anti-flight mechanism according to claim 2, characterized in that: The anti-flight device includes a drive guide rod and at least three anti-flight blocks evenly arranged along the circumference of the fracturing device body. A guide hole corresponding to the axial hole is opened along the center line at the rear of the fracturing device body. The drive guide rod is slidably disposed in the guide hole. A groove for accommodating and hiding the anti-flight blocks is provided on the outer circle of the rear of the fracturing device body. An installation hole is provided inside the fracturing device body to connect the guide hole with each groove. A connecting rod is provided in each installation hole. The inner end of the connecting rod is hinged to the connecting rod through a first hinge. The outer end of the connecting rod is hinged to the middle of the anti-flight block through a second hinge. The first hinge is located in front of the second hinge. The inner side of the rear end of the anti-flight block is hinged to the bottom of the rear end of the groove through a third hinge.

4. The carbon dioxide fracturing device with integrated anti-flight mechanism according to claim 3, characterized in that: The front end of the anti-flying block has a sharp structure. On the body of the fracturing device, a torsion spring is provided between the rear side wall of the groove and the rear end of the anti-flying block, located outside the third hinge. The two spring arms of the torsion spring are pressed against the rear side wall of the groove and the rear end face of the anti-flying block, respectively.

Images