Bamboo joint type oxygen inhalation inner core assembly and fracturing pipe

Abstract

The utility model provides a bamboo joint type oxygen inhalation inner core assembly and a fracturing pipe, relates to the technical field of expansion fracturing, and comprises an inner core, the inner core comprises an infusion tube, liquid outlets are arranged in the circumferential direction of the infusion tube, a first quick connector with a central through hole is arranged at the lower end of the infusion tube, a medium layer is arranged outside the infusion tube, and a second quick connector with a central through hole is arranged outside the medium layer. The dielectric layer is used for absorbing liquid oxygen in the infusion tube; the at least one electronic excitation unit comprises an ignition head and an excitation cartridge bag, the excitation cartridge bag is arranged outside the dielectric layer, and the ignition head is used for igniting the excitation cartridge bag; the inner cores are connected end to end through first quick connectors. The oxygen inhalation inner core assembly is formed by sequentially connecting the multiple inner cores end to end, so that the oxygen inhalation inner core assembly can be flexibly adjusted and assembled in the length direction and the radial direction according to the length and the diameter of the fracturing pipe.

Description

Technical Field

[0001] This utility model relates to the field of expansion-induced cracking technology, and in particular to a bamboo-shaped oxygen-absorbing inner core assembly and cracking tube. Background Technology

[0002] Oxygen gas fracturing technology utilizes the phase change of heated liquid oxygen to rapidly accumulate and release a large amount of high-pressure oxygen, thereby fracturing rocks. This technology boasts advantages such as simple process, low cost, safety, no pollution, and less vibration than traditional blasting, making it widely used in mining, tunneling, and other construction fields. The liquid oxygen gas fracturing technology involves in-hole filling, and the fracturing tube is simple, convenient, safe, and reliable to manufacture and store. Because it generates less vibration than traditional blasting, it has significant development potential and advantages in sensitive areas such as underwater where strong vibrations cannot be induced.

[0003] A liquid oxygen fracturing tube generally consists of a fracturing tube cavity and an oxygen-absorbing medium. After the liquid oxygen fracturing tube is filled with liquid oxygen, the delivery tube is cut off, the ignition head is activated, and the oxygen-absorbing medium that absorbs the liquid oxygen reacts with the liquid oxygen, releasing a large amount of heat. This accelerates the phase change process of the liquid oxygen, increases the pressure inside the fracturing tube, and releases a large amount of high-pressure oxygen, causing the rock to fracture.

[0004] When fracturing underwater, the fracturing tube often floats up and becomes suspended inside the borehole, resulting in poor fracturing effect. Moreover, due to different fracturing requirements, the diameter and length of the fracturing tube vary, which leads to changes in the diameter and length of the oxygen-absorbing core. Traditional oxygen-absorbing cores are molded in one piece, which cannot be flexibly selected and efficiently assembled, which undoubtedly affects the construction efficiency. Utility Model Content

[0005] This invention provides a bamboo-shaped oxygen-absorbing inner core assembly and a crack-inducing tube, the purpose of which is to solve the problem that existing inner cores cannot be flexibly adjusted based on crack-inducing requirements during use.

[0006] To achieve the above objectives, embodiments of this utility model provide a bamboo-shaped oxygen-absorbing core assembly, comprising:

[0007] The inner core includes an infusion tube with an outlet in its circumferential direction. The lower end of the infusion tube is provided with a first quick connector having a central through hole. A medium layer is provided outside the infusion tube for absorbing liquid oxygen inside the infusion tube.

[0008] At least one electronic excitation unit includes an ignition head and an ignition charge, wherein the ignition charge is disposed outside the dielectric layer, and the ignition head is used to ignite the ignition charge;

[0009] Several of the inner cores are connected end to end via a first quick connector.

[0010] Preferably, the medium layer is wrapped with a sealing layer, the sealing layer is used for sealing the medium layer, and the electronic excitation unit is bonded outside the sealing layer.

[0011] Preferably, the excitation charge includes a plastic mesh bag, steel wool and carbon powder, wherein the carbon powder is wrapped by the steel wool, and the steel wool is wrapped by the plastic mesh bag.

[0012] Preferably, the medium layer is composed of one or more of a paper material, a cotton material or a moldable combustible organic medium.

[0013] Preferably, when the medium layer is a paper material, the medium layer is wrapped outside the infusion tube layer by layer.

[0014] Preferably, when the medium layer is a moldable combustible organic medium, the combustible organic medium is pressed into a cylindrical shape, and the infusion tube is arranged inside the combustible organic medium.

[0015] The application also provides a cracking pipe, comprising:

[0016] A pipe body, an upper end of the pipe body is provided with an upper end cover, and a lower end of the pipe body is provided with a lower end cover, the upper end cover and the lower end cover seal the upper end and the lower end of the pipe body respectively;

[0017] The foregoing oxygen inhalation inner core assembly is arranged in the pipe body, and the infusion tube is arranged in the upper end cover.

[0018] Preferably, the lower end of the pipe body is further provided with a counterforce petal, the counterforce petal is arranged around the pipe body, and the counterforce petal and the upper end of the pipe body form an acute angle.

[0019] The above scheme of the utility model has the following beneficial effects:

[0020] First, in the application, the oxygen inhalation inner core assembly is connected in sequence by a plurality of inner cores, so that the oxygen inhalation inner core assembly can be flexibly adjusted and assembled according to the length of the cracking pipe in the length direction, and a prefabricated oxygen inhalation inner core assembly is realized.

[0021] Second, by pre-preparing medium layers with different thicknesses, the inner core can produce different cracking effects at different height positions of the cracking pipe according to different cracking requirements, which provides a device basis for fine cracking and regional cracking and improves the assembly efficiency of the cracking pipe.

[0022] Third, the medium layer is wrapped with a sealing layer, which plays a role in waterproofing and moisture-proofing, and also enables the liquid oxygen to be sealed by the sealing layer, thereby providing sufficient adsorption time for the medium layer to adsorb the liquid oxygen.

[0023] Fourth, this application can make full use of waste paper, wood chips and other materials to compress the medium layer, which can make full use of waste.

[0024] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the oxygen absorption core assembly;

[0026] Figure 2 This is a schematic diagram of the ruptured tube;

[0027] Figure 3 yes Figure 2 Enlarged view of section A;

[0028] Figure 4 This is a schematic diagram of the lower mold structure.

[0029] [Explanation of Labels in the Attached Image]

[0030] 10-Inner core, 11-Infusion tubing, 12-Outlet, 13-First quick connector, 14-Media layer, 15-Electron excitation unit, 16-Sealing layer

[0031] 20-tube body, 21-reaction petals

[0032] 30 - Lower mold, 31 - Lower mold cavity, 32 - Accommodation half hole. Detailed Implementation

[0033] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figures 1-4 As shown, an embodiment of this utility model provides a bamboo-shaped oxygen-absorbing inner core assembly, including an inner core 10. The inner core 10 includes an infusion tube 11, with an outlet 12 arranged circumferentially on the infusion tube 11. A first quick connector 13 with a central through-hole is provided at the lower end of the infusion tube 11. The electron excitation unit 15 is bonded to the outside of the sealing layer 16. A medium layer 14 is disposed outside the infusion tube 11, which absorbs the liquid oxygen within the infusion tube 11. When liquid oxygen passes through the infusion tube 11, it wets the medium layer 14 disposed on the infusion tube 11 through the outlet 12. After a phase change, the liquid oxygen rapidly expands in volume, achieving a cracking effect.

[0035] In order to control the timing of the volume change of the liquid oxygen, the oxygen-absorbing inner core assembly further comprises at least one electronic excitation unit 15, the electronic excitation unit 15 comprising an ignition head and an excitation charge, both of which are arranged outside the medium layer 14, the ignition head being used to ignite the excitation charge, and the excitation charge causing the volume of the liquid oxygen to expand rapidly through combustion, thereby achieving the fracturing.

[0036] In the present application, the plurality of inner cores 10 are sequentially connected in a head-to-tail manner through the first quick connector 13, so that the oxygen-absorbing inner core assembly can be adapted to different fracturing tubes. Meanwhile, the inner core 10 can also be provided with different thicknesses of the medium layer 14 to achieve different fracturing effects.

[0037] Generally, in the process of fracturing, there are different fracturing requirements at different heights of the blast hole, such as using the inner core 10 with a non-equal diameter to produce different fracturing effects. For example, in the present embodiment, the upper and lower ends of the oxygen-absorbing inner core assembly can use the inner core 10 with a medium layer 14 of a larger diameter, and the middle part uses the inner core 10 with a medium layer 14 of a smaller diameter. This assembly method can reduce the large block rate at the upper end of the blast hole and overcome the problem of large clamping at the bottom and leaving a root at the bottom.

[0038] As can be seen from the above use scenarios, the plurality of inner cores 10 connected in a head-to-tail manner can be quickly assembled, so that the oxygen-absorbing inner core assembly can be quickly made for different fracturing requirements, thereby improving the assembly effect and realizing a modularized and standardized operation process.

[0039] Further, a sealing layer 16 is arranged outside the medium layer 14, the sealing layer 16 being used to seal the medium layer 14. It can be understood that the sealing layer 16 is wrapped around the upper and lower ends and the circumference of the medium layer 14, and the sealing layer 16 can use a sealing film. The sealing layer 16 not only has the effect of preventing water and moisture in the present application, but also has the effect of sealing the liquid oxygen. The electronic excitation unit 15 is glued to the outside of the sealing layer 16.

[0040] In the process of the liquid oxygen injection of the cracking tube, in order to ensure safety, the cracking tube is usually placed in the blast hole to inject oxygen, at this time, the cracking tube is mostly in the upright state, and the liquid oxygen is divided into first liquid oxygen and second liquid oxygen in the process of injection, wherein the first liquid oxygen flows along the axial direction of the liquid delivery pipe 11 to the bottom of the cracking tube and slowly accumulates upward, and the second liquid oxygen infiltrates the medium layer 14 through the liquid outlet 12. Since the liquid oxygen is a liquid, the medium layer 14 at the bottom of the cracking tube has sufficient time and sufficient amount of liquid oxygen for adsorption, and the medium layer 14 above can absorb the second liquid oxygen, but the second liquid oxygen will continue to flow downward under the action of gravity, resulting in poor adsorption effect of the medium layer 14 above. At this time, the sealing film individually packages and seals each inner core 10, and the liquid oxygen absorbed by each inner core 10 stops at the sealing film, so as to leave sufficient time and sufficient amount of liquid oxygen for the medium layer 14 above to adsorb, thereby improving the efficiency of the medium layer 14 in absorbing liquid oxygen.

[0041] Further, the excitation package includes a plastic mesh bag, steel wool and carbon powder, wherein the carbon powder is wrapped by the steel wool, and the steel wool is wrapped by the plastic mesh bag. The excitation package is combusted under the spark generated by the ignition head, so as to ignite the liquid oxygen and realize rapid expansion of the volume of the liquid oxygen. In the present application, the ignition head is an electronic ignition head, and the electronic ignition heads of the oxygen-absorbing inner core assemblies are connected in parallel on the exciter.

[0042] Since the evaporation speed of the liquid oxygen is relatively fast, in the accumulation process of the first liquid oxygen, the liquid oxygen content in the uppermost medium layer 14 is prevented from being reduced by the sealing layer 16, so as to affect the accurate cracking.

[0043] Further, the medium layer 14 is composed of one or more of paper material, cotton material or moldable combustible organic medium.

[0044] Specifically, when the medium layer 14 is paper material or cotton material, such as toilet paper or cloth, the toilet paper or cloth is wrapped layer by layer outside the liquid delivery pipe 11. After the wrapping is completed, the medium layer 14 is wrapped and sealed by the sealing film, and the electronic excitation unit 15 is fixed outside the sealing layer 16.

[0045] When the medium layer 14 is a moldable combustible organic medium, the combustible organic medium is pressed into a cylindrical shape, and the liquid delivery pipe 11 is arranged inside the combustible organic medium.

[0046] Specifically, the pressing of the combustible organic medium uses a pressing mold, the pressing mold comprises an upper mold and a lower mold 30 which are identical in structure, wherein the upper mold is provided with an upper mold cavity on one side opposite to the lower mold 30, the lower mold 30 is provided with a lower mold cavity 31 on one side opposite to the upper mold, the upper mold cavity and the lower mold cavity 31 form a mold cavity when the upper mold and the lower mold 30 are closed, and a half-hole 32 is further arranged on the opposite side of the upper mold and the lower mold 30, the half-hole 32 is arranged on both sides of the mold cavity, and in this embodiment, the mold cavity is cylindrical, and the half-hole 32 is arranged in the axial direction of the mold cavity.

[0047] When the combustible organic medium is used to make the medium layer 14, the combustible organic medium is first filled into the lower mold cavity 31, the combustible organic medium in the lower mold cavity 31 is preliminarily compacted, the infusion tube 11 is placed on the lower mold 30 along the direction of the two half-holes 32, the combustible organic medium is continuously filled into the lower mold cavity 31, and the upper mold and the lower mold are closed to compact the combustible organic medium to obtain the medium layer 14 with the infusion tube 11. After the pressing is completed, the medium layer 14 is wrapped and sealed by a sealing film, and the electronic excitation unit 15 is fixed outside the sealing layer 16.

[0048] In this embodiment, the sealing film also has the effect of preventing the combustible organic medium from scattering.

[0049] The application also provides a cracking tube which uses the aforementioned oxygen absorption inner core assembly, the cracking tube comprises a tube body 20, the upper end and the lower end of the tube body 20 are respectively provided with an upper end cover and a lower end cover, the upper end cover and the lower end cover respectively seal the tube body 20 from the upper end and the lower end of the tube body 20, so that the tube body 20 is in a sealed state. The oxygen absorption inner core assembly is arranged in the tube body 20, and the infusion tube 11 at the uppermost end penetrates the upper end cover, and the upper end cover and the infusion tube 11 at the uppermost end are sealed by waterproof glue.

[0050] Preferably, a second quick connector which penetrates the upper end cover is arranged on the upper end cover, the second quick connector is used to connect the infusion tube 11 of the oxygen absorption inner core assembly at the uppermost end, so as to facilitate the quick connection of the infusion tube 11.

[0051] Preferably, an exhaust pipe is further arranged on the upper end cover, the exhaust pipe communicates with the inside of the tube body 20, and the exhaust pipe is used to exhaust the air in the tube body 20 on one hand, and is used to judge whether the oxygen injection is completed through the form of smoke on the other hand.

[0052] Preferably, a wire hole is further arranged on the upper end cover for the lead of the electronic excitation unit 15 to penetrate, and the wire hole is sealed by sealing glue.

[0053] Further, the lower end of the pipe body 20 is also provided with a counterforce petal 21, the counterforce petal 21 is annularly arranged on the pipe body 20, and the counterforce petal and the upper end of the pipe body 20 form an acute angle. The counterforce petal 21 is made of semi-rigid material, such as PVC, PE and the like, and has a certain stress deformation capacity. The counterforce petal 21 can offset the upward movement tendency due to the buoyancy, so as to ensure that the fracturing pipe is fixed in the blast hole.

[0054] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the technical field, without departing from the principles described in the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A bamboo-joint shaped oxygen-absorbing core assembly, characterized in that, include: The inner core (10) includes an infusion tube (11), an outlet (12) is provided in the circumferential direction of the infusion tube (11), a first quick connector (13) with a central through hole is provided at the lower end of the infusion tube (11), and a medium layer (14) is provided outside the infusion tube (11) for absorbing liquid oxygen in the infusion tube (11); At least one electronic excitation unit (15) includes an ignition head and an excitation charge, the excitation charge being disposed outside the dielectric layer (14), and the ignition head being used to ignite the excitation charge; Several of the inner cores (10) are connected end to end via a first quick connector (13).

2. The bamboo-shaped oxygen-absorbing core assembly according to claim 1, characterized in that: The dielectric layer (14) is surrounded by a sealing layer (16), which is used to seal the dielectric layer (14), and the electron excitation unit (15) is bonded to the outside of the sealing layer (16).

3. The bamboo-shaped oxygen-absorbing core assembly according to claim 1, characterized in that: The activation pack includes a plastic mesh bag, steel wool, and carbon powder, wherein the carbon powder is wrapped in steel wool, and the steel wool is wrapped in the plastic mesh bag.

4. The bamboo-shaped oxygen-absorbing core assembly according to claim 1, characterized in that: The medium layer (14) is composed of one or more of paper materials, cotton materials, or moldable combustible organic media.

5. The bamboo-shaped oxygen-absorbing core assembly according to claim 4, characterized in that: When the medium layer (14) is made of paper, the medium layer (14) is wrapped around the outside of the infusion tube (11) layer by layer.

6. The bamboo-shaped oxygen-absorbing core assembly according to claim 4, characterized in that: When the medium layer (14) is a malleable combustible organic medium, the combustible organic medium is pressed into a cylindrical shape, and the infusion tube (11) is disposed inside the combustible organic medium.

7. A fracturing tube, characterized in that, include: The tube body (20) is provided with an upper end cap at the upper end and a lower end cap at the lower end, and the upper end cap and the lower end cap respectively seal the upper end and the lower end of the tube body (20); The oxygen-absorbing inner core assembly according to any one of claims 1-6, wherein the oxygen-absorbing inner core assembly is disposed inside the tube body (20), and the infusion tube (11) passes through the upper end cap.

8. The fracturing tube according to claim 7, characterized in that: The lower end of the tube (20) is also provided with a reaction petal (21), which is arranged around the tube (20) and forms an acute angle with the upper end of the tube (20).

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