Cracking pipe with gas filled in hole

Abstract

The utility model provides an in-hole gas filling fracturing pipe which comprises an inner pipe body and an outer pipe body, the inner pipe body is located in the center inside the outer pipe body, and an ignition device is arranged in the inner pipe body. The inflation tube is inserted into the inner tube body from the upper end of the inner tube body; the exhaust pipe is inserted into the outer pipe body from the upper end of the outer pipe body; the upper portion and the lower portion of the inner pipe body are respectively provided with a communicating hole communicated with the outer pipe body. When rock mass explosion fracturing work is carried out, the ignition device ignites liquid fracturing gas in the inner pipe body firstly, due to the fact that the communicating holes are only formed in the upper end and the lower end of the inner pipe body, a basically closed environment is formed in the inner pipe body, and a small amount of liquid fracturing gas in the inner pipe body explodes firstly and presses the liquid fracturing gas in the outer pipe body to damage the outer pipe body; and then a large amount of liquid fracturing gas in the outer pipe body is rapidly pressed into rock mass gaps along pores of the rock mass hole wall and rapidly expands and explodes in the rock mass gaps along with heat transfer of explosion, so that the rock mass is fractured by means of the rock mass gaps, and the crushing effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of rock mass blasting technology, especially to a hole filling gas fracturing pipe. BACKGROUND

[0002] Due to the needs of resource development, engineering construction and other aspects, human beings' demand for rock breaking has never stopped. As early as the 5th century BC, China used fire blasting to fall mines. Since the 19th century, the invention of nitroglycerin explosives has made blasting the most widely used method of rock breaking and excavation. To overcome the many shortcomings of blasting, some safe and reliable blasting replacement technologies have been gradually introduced into the field of rock breaking and excavation.

[0003] In the prior art, for example, Chinese patent CN218723559U granted on March 24, 2023, Chinese patent CN110631425B granted on August 25, 2023, and Chinese patent CN220203892U granted on December 19, 2023, etc., all by drilling holes in rock mass and placing fracturing pipes in the holes, filling liquid fracturing gas in the fracturing pipes, and then igniting by ignition device to make the liquid fracturing gas rapidly gasify and expand to explode, to achieve the purpose of fracturing rock mass.

[0004] However, the fracturing pipes in such prior art are all single structure, and the fracturing gas synchronously expands and explodes after being ignited in the fracturing pipe, and the explosion energy is basically consumed by impacting the hole wall of the drilled hole in the rock mass, and less energy enters the rock mass joint, resulting in insufficient fracturing and breaking effect on the rock mass.

[0005] If the fracturing gas can be ignited after entering the rock mass joint along the hole wall drilled in the rock mass, the explosion energy can be used to fracture the rock mass through the rock mass joint, thereby improving the breaking effect. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a hole filling gas fracturing pipe, which can press part of the fracturing gas into the rock mass joint to expand and explode, thereby improving the breaking effect.

[0007] The utility model provides a hole filling gas fracturing pipe, which comprises an inner pipe body and an outer pipe body, the inner pipe body is located in the central part inside the outer pipe body, a ignition device is arranged in the inner pipe body, a gas filling pipe is inserted into the inner pipe body from the upper end of the inner pipe body, an exhaust pipe is inserted into the outer pipe body from the upper end of the outer pipe body, and the upper part and the lower part of the inner pipe body are respectively provided with communication holes in communication with the outer pipe body.

[0008] Further, a plurality of easy-to-break zones are arranged around the outer pipe body.

[0009] Further, the easy-to-break belt comprises wedge-shaped notches arranged at the same circumferential position of the inner wall and the outer wall of the outer tube body.

[0010] Further, the ignition device is located at the middle part of the inner tube body in the axial direction.

[0011] Further, the number of the ignition devices is multiple, and the ignition devices are uniformly arranged in the circumferential direction outside the inflation tube.

[0012] Further, the top end of the inner tube body is externally provided with a connecting ring, a plurality of positioning rods are connected to the connecting ring in the circumferential direction, the positioning rods are inserted into the inner tube body through the top end cover of the inner tube body and connected to the ignition devices, and the wires of the ignition devices are connected to the connecting ring.

[0013] Further, a plurality of inflation holes are arranged on the inflation tube in the axial direction and the circumferential direction.

[0014] Further, a plurality of concave curved sections are arranged on the inflation tube in the axial direction, and the number of the inflation holes on the curved sections is greater than that on the cylindrical sections.

[0015] Further, the curved sections are radially reduced structures compared with the cylindrical sections, or the curved sections are radially enlarged structures compared with the cylindrical sections.

[0016] Further, the inflation tube and the exhaust tube are respectively provided with switches.

[0017] The technical scheme of the utility model discloses a sleeve structure of an inner tube body and an outer tube body, when liquid fracturing gas is filled, the inflation tube fills the inner tube body and then fills the outer tube body from the communication hole, and when the inflation tube is filled, the liquid fracturing gas in the outer tube body overflows from the exhaust tube.When the rock mass is fractured by explosion, the ignition device ignites the liquid fracturing gas in the inner tube body first, because the inner tube body is only provided with communication holes at the upper end and the lower end, a basically closed environment is formed in the inner tube body, a small amount of liquid fracturing gas in the inner tube body explodes first and compresses the liquid fracturing gas in the outer tube body to destroy the outer tube body, then a large amount of liquid fracturing gas in the outer tube body is rapidly pressed into the rock mass crevice along the pore of the rock mass hole wall, and simultaneously expands rapidly in the rock mass crevice with the heat transfer of explosion, so that the rock mass is fractured by the rock mass crevice, and the breaking effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the specific embodiment or the prior art of the utility model, the drawings needed in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to the drawings without creating labor.

[0019] Figure 1 It is the external structure schematic view of the utility model;

[0020] Figure 2 It is the internal section view of the radial reduction structure inflatable pipe of the utility model;

[0021] Figure 3 It is the A-A section view of the utility model Figure 2 ;

[0022] Figure 4 It is the C enlarged view of the utility model Figure 3 ;

[0023] Figure 5 It is the internal section view of the radial expansion structure inflatable pipe of the utility model;

[0024] Figure 6 It is the B-B section view of the utility model Figure 5 ;

[0025] Figure 7 It is the internal structure three-dimensional schematic view of the utility model;

[0026] Explanation of reference signs:

[0027] 1-inner tube body;101-communication hole;2-outer tube body;201-easy-to-break zone;3-ignition device;301-connection ring;302-positioning rod;4-inflatable pipe;401-inflation hole;402-curved section;403-radial reduction structure;404-radial expansion structure;5-exhaust pipe;6-switch. Specific implementation

[0028] The technical scheme of the utility model will be described clearly and completely in combination with embodiments, obviously, the described embodiments are a part of embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0029] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Example 1

[0032] like Figures 1-7 As shown, this utility model provides a gas-filled fracturing tube, including an inner tube 1 and an outer tube 2. The inner tube 1 is located in the center inside the outer tube 2, and an ignition device 3 is provided in the inner tube 1. A gas filling tube 4 is inserted into the inner tube 1 from the upper end; an exhaust tube 5 is inserted into the outer tube 2 from the upper end; the upper and lower parts of the inner tube 1 are respectively provided with connecting holes 101 to communicate with the outer tube 2. Switches 6 are respectively provided on the gas filling tube 4 and the exhaust tube 5.

[0033] Specifically, in this device, when liquid fracturing gas is introduced, the inflation pipe 4 is connected to a pressurized container to introduce the liquid fracturing gas into the inner tube 1. The liquid fracturing gas first enters the inner tube 1 and then flows through the connecting hole 101 into the outer tube 2 until both the inner tube 1 and the outer tube 2 are filled. At this point, the liquid fracturing gas overflows from the exhaust pipe 5. The switches 6 or valves on the inflation pipe 4 and the exhaust pipe 5 are then closed. Existing technologies, such as liquid oxygen, can be directly used as the liquid fracturing gas.

[0034] When working on the rock mass to induce fracturing, the ignition device 3 first ignites the liquid fracturing gas in the inner tube 1. Since the inner tube 1 only has connecting holes 101 at the upper and lower ends, and the diameter of the connecting holes 101 is small, a basically closed environment is formed inside the inner tube 1. A small amount of liquid fracturing gas in the inner tube 1 expands and explodes first, and then the inner tube 1 breaks. The shock wave of the explosion compresses the liquid fracturing gas in the outer tube 2 and the broken inner tube 1, destroying the outer tube 2. Subsequently, a large amount of liquid fracturing gas in the outer tube 2 is rapidly forced into the rock mass fissures along the pores of the rock mass borehole wall. At the same time, with the heat transfer from the expansion and explosion of the fracturing gas in the inner tube 1, the liquid fracturing gas in the rock mass fissures rapidly expands and explodes, thereby fracturing the rock mass by means of the rock mass fissures and improving the fracturing effect.

[0035] In the device, the inner tube body 1 plays a role of breaking the outer tube body 2 and delaying the explosion of the liquid cracking gas in the outer tube body 2. The liquid cracking gas in the outer tube body 2 is mainly used for cracking the rock mass. Therefore, the inner tube body 1 only needs to contain a small amount of liquid cracking gas, and the volume of the inner tube body 1 is about 1 / 5 to 1 / 10 of the volume of the outer tube body 2.

[0036] Embodiment 2

[0037] A plurality of easy-to-break zones 201 are arranged on the outer tube body 2. The easy-to-break zone 201 includes a wedge-shaped notch arranged at the same circumferential position of the inner wall and the outer wall of the outer tube body 2.

[0038] Specifically, the easy-to-break zone 201 has two functions in the device. One is that when the cracking gas in the inner tube body 1 expands, the easy-to-break zone 201 makes the outer tube body 2 more easily broken, so that the cracking gas in the outer tube body 2 leaks out more quickly into the rock mass cracks. The second is that when the outer tube body 2 is broken along the wedge-shaped notch, the cracking gas in the outer tube body 2 is accelerated and ejected outward when it leaks from the first narrowed and then expanded crack, and is more quickly and comprehensively pressed into the rock mass cracks along the pores of the rock mass hole wall.

[0039] Embodiment 3

[0040] The ignition device 3 is located in the middle of the inner tube body 1 along the axial direction. The number of ignition devices 3 is multiple, and they are uniformly arranged on the outer wall of the inflation tube 4 along the circumferential direction. The top of the inner tube body 1 is externally provided with a connecting ring 301, and a plurality of positioning rods 302 are connected around the connecting ring 301. The positioning rods 302 pass through the top cover of the inner tube body 1 and are inserted into the inner tube body 1 to connect with the ignition device 3. The wires of the ignition device 3 are connected to the connecting ring 301.

[0041] Specifically, in the device, four ignition devices 3 are located around the middle of the inner tube body 1. When ignited, the four ignition devices 3 are ignited synchronously, and the cracking gas expands synchronously from the middle of the inner tube body 1 to both ends, so that the destruction of the outer tube body 2 is synchronous and uniform, and the outer tube body 2 is more easily broken along the easy-to-break zone 201.

[0042] Because the cracking tube may have various postures when in use, such as vertical placement, horizontal placement, or inclined placement, etc., in order to maintain the positions of the four ignition devices 3 in the inner tube body 1, a positioning rod 302 made of hard plastic or other materials with certain rigidity is used to support the position of the ignition device 3, so that it still maintains the central position of the inner tube body 1 when placed horizontally or obliquely. The wires of the ignition device 3 are wound around or pass through the positioning rod 302, and are connected to the connecting ring 301 together. When the connecting ring 301 is powered, all the ignition devices 3 are powered and ignited synchronously.

[0043] Embodiment 4

[0044] The inflation pipe 4 is provided with a plurality of inflation holes 401 in an axial and circumferential array. The inflation pipe 4 is provided with a plurality of concave curved sections 402 in an axial interval, and the number of the inflation holes 401 on the curved sections 402 is more than that of the inflation holes 401 on the cylindrical sections. The curved sections 402 are radial reduction structures 403 compared with the cylindrical sections, or the curved sections 402 are radial expansion structures 404 compared with the cylindrical sections.

[0045] Specifically, some prior art, such as CN220203892U described in the background, increases the number of inflation holes 401 on the inflation pipe 4 by providing a diameter expansion pipe on the inflation pipe 4, so as to speed up the inflation speed. However, the diameter expansion structure increases the volume of the inflation pipe 4, occupies more space in the fracturing pipe, and accordingly reduces the volume of the fracturing gas contained in the fracturing pipe, thereby reducing the explosion power of the fracturing pipe and the rock breaking effect.

[0046] In the device, the curved sections 402 increase the surface area of the inflation pipe 4. Since the area of the position of the curved sections 402 is larger, more inflation holes 401 can be arranged, and the curved sections 402 do not increase the space occupied by the inflation pipe 4. Compared with the prior art, the volume of the fracturing gas contained in the fracturing pipe is larger, which corresponds to the increase of the explosion power of the fracturing pipe and the rock breaking effect.

[0047] In addition, the curved sections 402 can adopt the radial reduction structure 403 on the inflation pipe 4, or the radial expansion structure 404 on the inflation pipe 4. When the radial reduction structure 403 is adopted, the inflation pipe 4 occupies less space, but the reduction of the inner diameter of the inflation pipe 4 will reduce the flow and affect the inflation speed to some extent. When the radial expansion structure 404 is adopted, the inflation pipe 4 occupies more space, but still less than the space occupied by the diameter expansion pipe with the cylindrical structure in the prior art, and the inner diameter of the inflation pipe 4 is not affected, and the inflation flow and the inflation speed will not be reduced.

[0048] In addition, in the device, the inflation holes 401 are staggered on the inflation pipe 4, that is, the four inflation holes 401 adjacent to each other in up and down and left and right directions are arranged in a diamond position.

[0049] The working mode and principle of the device are as follows:

[0050] When the liquid fracturing gas is filled, the inflation pipe 4 is connected to the pressurized container to fill the liquid fracturing gas into the inner pipe body 1. The liquid fracturing gas first enters the inner pipe body 1 and then passes through the inflation outer pipe body 2 from the communication hole 101, until the inner pipe body 1 and the outer pipe body 2 are filled with the liquid fracturing gas, and the liquid fracturing gas overflows from the exhaust pipe 5. At this time, the switches 6 or valves on the inflation pipe 4 and the exhaust pipe 5 are closed.

[0051] When the fracturing and expanding rock mass work is carried out, the ignition device 3 ignites the liquid fracturing gas in the inner tube body 1 first, a small amount of liquid fracturing gas in the inner tube body 1 expands and explodes first, then the inner tube body 1 breaks, the explosion shock wave compels the liquid fracturing gas in the outer tube body 2 and the broken inner tube body 1, and the outer tube body 2 breaks along the easy fracture zone 201, then a large amount of liquid fracturing gas in the outer tube body 2 is rapidly pressed into the rock mass joint along the pore of the rock mass hole wall, at the same time, the liquid fracturing gas in the rock mass joint rapidly expands and explodes with the heat transfer of the fracturing gas in the inner tube body 1, so that the rock mass is fractured by the rock mass joint, and the breaking effect is improved.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A gas filled perforation tube for use in wellbore perforation, characterized in that, The device comprises an inner tube and an outer tube, the inner tube is located in the center of the outer tube, and the inner tube is provided with an ignition device; The inflation tube is inserted into the inner tube through the upper end of the inner tube; The exhaust tube is inserted into the outer tube through the upper end of the outer tube; The upper and lower parts of the inner tube are respectively provided with communication holes for communication with the outer tube.

2. The in-hole gas-charged perforating tube of claim 1, wherein, A plurality of easy-to-break belts are arranged around the outer tube.

3. The in-hole gas-filled frac pipe of claim 2, wherein, The easy-to-break belts comprise wedge-shaped notches arranged at the same circumferential position of the inner wall and the outer wall of the outer tube.

4. The in-hole gas-filled frac pipe of claim 1, wherein, The ignition device is located in the middle of the inner tube along the axial direction.

5. The in-hole gas-charge perforating gun of claim 4, wherein, The number of ignition devices is multiple, and they are uniformly arranged around the inflation tube along the circumferential direction.

6. The in-hole gas-charge perforating gun of claim 5, wherein, The top end of the inner tube is externally provided with a connecting ring, a plurality of positioning rods are connected around the connecting ring, the positioning rods are inserted into the inner tube through the top end cover of the inner tube and connected with the ignition device, and the wires of the ignition device are connected to the connecting ring.

7. The in-hole gas-charge perforating gun of claim 1, wherein, A plurality of inflation holes are arranged on the inflation tube along the axial and circumferential directions.

8. The in-hole gas-charge perforating gun of claim 7, wherein, A plurality of concave curved sections are arranged on the inflation tube along the axial direction, and the number of inflation holes on the curved sections is more than that on the cylindrical sections.

9. The in-hole gas-charge perforating gun of claim 8, wherein, The curved sections are radially reduced structures compared with the cylindrical sections, or the curved sections are radially enlarged structures compared with the cylindrical sections.

10. The in-hole gas-filled frac pipe of claim 1, wherein, The inflation tube and the exhaust tube are respectively provided with switches.

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