Bamboo joint type oxygen inhalation inner core assembly and manufacturing method of fracturing pipe

Abstract

The invention provides a bamboo joint type oxygen uptake inner core assembly and a manufacturing method of a fracturing pipe, and relates to the technical field of expansion fracturing, the bamboo joint type oxygen uptake inner core assembly comprises an inner core, the inner core comprises an infusion pipe, liquid outlets are formed in the circumferential direction of the infusion pipe, a quick connector with a center through hole is arranged at the lower end of the infusion pipe, a medium layer is arranged outside the infusion pipe, and the outer end of the medium layer is provided with a through hole. 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 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] The invention relates to the technical field of expansion fracturing, and in particular to a method for manufacturing a bamboo-shaped oxygen-absorbing inner core component and a fracturing tube. Background Art

[0002] Oxygen gas fracturing technology is a method that utilizes the phase change of liquid oxygen when heated, thereby gathering and releasing a large amount of high-pressure oxygen in a short period of time to achieve the purpose of fracturing rocks. This technology has the advantages of simple process, low cost, safety and pollution-free, and less vibration than traditional blasting. It is widely used in mining, tunneling and other construction fields. The filling method involved in liquid oxygen gas fracturing technology is in-hole filling. The production and storage of fracturing pipes are simple, convenient, safe and reliable. Because the vibration it produces is less than traditional blasting, it has great development potential and advantages in sensitive areas such as underwater that cannot cause strong vibrations in the future.

[0003] A liquid oxygen fracturing tube is generally composed of a fracturing tube cavity, an upper end cover, a lower end cover, a liquid infusion tube, an exhaust pipe, an ignition head, and an oxygen absorbing medium. After the liquid oxygen fracturing tube is filled with liquid oxygen, the liquid infusion tube is cut off and the ignition head is started. The oxygen absorbing medium that absorbs liquid oxygen will react with the liquid oxygen to release a large amount of heat, thereby accelerating the phase change process of liquid oxygen to increase the pressure inside the fracturing tube, thereby releasing a large amount of high-pressure oxygen to cause rock fracturing.

[0004] When fracturing underwater, the fracturing tube often floats up and floats in the blasthole, resulting in poor fracturing effect. Moreover, based on different fracturing requirements, the diameter and length of the fracturing tube are different, resulting in changes in the diameter and length of the oxygen absorbing core. The traditional oxygen absorbing core is formed in one step, and the oxygen absorbing core cannot be flexibly selected and efficiently assembled, which undoubtedly affects the construction efficiency. Summary of the invention

[0005] The invention provides a bamboo-shaped oxygen absorption inner core component and a method for manufacturing a fracturing tube, the purpose of which is to solve the problem that the existing oxygen absorption inner core cannot be flexibly adjusted based on fracturing requirements during use.

[0006] In order to achieve the above object, an embodiment of the present invention provides a bamboo-shaped oxygen absorbing inner core component, comprising:

[0007] The inner core includes an infusion tube, a liquid outlet is arranged on the circumference of the infusion tube, a quick connector with a central through hole is arranged at the lower end of the infusion tube, and a medium layer is arranged outside the infusion tube, and the medium layer is used to absorb liquid oxygen in the infusion tube;

[0008] At least one electronic excitation unit, including an ignition head and an excitation medicine package, wherein the excitation medicine package is arranged outside the dielectric layer, and the ignition head is used to ignite the excitation medicine package;

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

[0010] Preferably, the dielectric layer is surrounded by a sealing layer, the sealing layer is used to seal the dielectric layer, and the electron excitation unit is arranged outside the sealing layer.

[0011] Preferably, the excitation medicine package comprises 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 made of one or more of paper material, cotton material or plastic formable combustible organic medium.

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

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

[0015] The present application also provides a method for manufacturing a fracturing tube, using the aforementioned bamboo-shaped oxygen-absorbing inner core component, comprising:

[0016] S10. Determine the length of the inner core assembly and the length of a single inner core according to the length of the fracturing tube;

[0017] S20. Wrapping the paper material layer by layer on the infusion tube, after the paper material is wrapped, wrapping the sealing film around the outside of the paper material to form a sealing layer;

[0018] S30. After sealing, the excitation cartridge and the ignition head are fixed outside the sealing layer 16;

[0019] S40. Connect several inner cores end to end through quick connectors to form an oxygen absorption inner core assembly;

[0020] S50. Place the oxygen absorption core assembly in the fracturing tube, and seal the upper and lower ends of the fracturing tube. Set reaction petals at the lower end of the fracturing tube. The reaction petals are arranged around the fracturing tube, and the reaction petals are used to abut against the blast hole.

[0021] The present application also provides another method for manufacturing a fracture-causing tube, using the aforementioned bamboo-shaped oxygen-absorbing inner core component, comprising:

[0022] S10. Determine the length of the inner core assembly and the length of a single inner core according to the length of the fracturing tube;

[0023] S20. The dielectric layer is produced by using a pressing mold, wherein the pressing mold includes an upper mold having an upper mold cavity and a lower mold having a lower mold cavity, wherein the upper mold and the lower mold are combined to form a mold cavity, and both ends of the upper mold and the lower mold are respectively provided with a receiving half hole for accommodating an infusion tube;

[0024] The combustible organic medium is filled into the lower mold cavity, and after preliminary compaction, the infusion tube is placed in the receiving half hole, and the combustible organic medium is then filled above the infusion tube, and the mold is closed to obtain a medium layer;

[0025] S30. The dielectric layer is wrapped with a sealing film to form a sealing layer, the sealing layer includes the upper and lower ends and the circumference of the paper material, and the excitation cartridge and the ignition head are fixed outside the sealing layer;

[0026] S40. Connect several inner cores end to end through quick connectors to form an oxygen absorption inner core assembly;

[0027] S50. Place the oxygen absorption core assembly in the fracturing tube, and seal the upper and lower ends of the fracturing tube. Set reaction petals at the lower end of the fracturing tube. The reaction petals are arranged around the fracturing tube, and the reaction petals are used to abut against the blast hole.

[0028] The above scheme of the present invention has the following beneficial effects:

[0029] First, in the present application, the oxygen absorption inner core assembly is composed of a plurality of inner cores connected end to end in sequence, so that the oxygen absorption inner core assembly can be flexibly adjusted and assembled in the length direction according to the length of the fracture tube, thereby realizing a prefabricated oxygen absorption inner core assembly;

[0030] Second, by prefabricating dielectric layers with different thicknesses, the inner core can produce different fracturing effects at different heights of the fracturing tube according to different fracturing requirements, providing an equipment foundation for refined fracturing and regional fracturing, and improving the assembly efficiency of the fracturing tube;

[0031] Thirdly, the dielectric layer is wrapped with the sealing layer, which plays a role in waterproofing and moisture-proofing, and also allows the liquid oxygen to be encapsulated by the sealing layer, providing sufficient adsorption time for the dielectric layer to adsorb the liquid oxygen.

[0032] Fourthly, the present application can make full use of waste paper, wood chips and other materials to press them into a medium layer, and can fully utilize the waste.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of an oxygen absorbing core assembly;

[0035] Figure 2 is a schematic diagram of the fracture tube;

[0036] Figure 3 yes Figure 2 A magnified view of part A;

[0037] Figure 4 It is a schematic diagram of the structure of the lower mold.

[0038] [Description of Reference Numerals]

[0039] 10-inner core, 11-infusion tube, 12-liquid outlet, 13-quick connector, 14-medium layer, 15-electronic excitation unit, 16-sealing layer,

[0040] 20-crack tube, 21-reaction petals

[0041] 30-lower mold, 31-lower mold cavity, 32-accommodating half hole. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0043] like Figure 1-Figure 4 As shown, an embodiment of the present invention provides a bamboo-shaped oxygen absorbing inner core assembly, including an inner core 10, wherein the inner core 10 includes an infusion tube 11, a liquid outlet 12 is provided on the circumference of the infusion tube 11, and a quick connector 13 is provided at the lower end of the infusion tube 11, and the quick connector 13 has a central through hole. A medium layer 14 is provided on the outside of the infusion tube 11, and the medium layer 14 is used to absorb the liquid oxygen in the infusion tube 11. When the liquid oxygen passes through the infusion tube 11, the medium layer 14 provided on the infusion tube 11 is infiltrated through the liquid outlet 12, and the volume of the liquid oxygen rapidly expands after the phase change, which can achieve the effect of fracturing.

[0044] In order to control the timing of the volume change of liquid oxygen, the oxygen absorbing core assembly also includes at least one electronic excitation unit 15. The electronic excitation unit 15 includes an ignition head and an excitation package. The ignition head and the excitation package are both arranged outside the medium layer 14. The ignition head is used to ignite the excitation package. The excitation package causes the volume of liquid oxygen to expand rapidly through combustion, thereby achieving fracturing.

[0045] In the present application, multiple inner cores 10 are connected end to end in sequence through quick connectors 13, so that the oxygen absorption inner core assembly can be adapted to different fracturing tubes 20. At the same time, the inner core 10 can also achieve different fracturing effects by setting the dielectric layer 14 of different thicknesses.

[0046] Usually, during the fracturing process, there are different fracturing requirements at different heights of the blasthole. For example, the use of inner cores 10 of non-equal diameters can produce different fracturing effects. For example, in this embodiment, the upper and lower ends of the oxygen absorption inner core assembly can use inner cores 10 with larger diameter dielectric layers 14, and the middle part can use inner cores 10 with smaller diameter dielectric layers 14. This assembly method can reduce the large block rate at the upper end of the blasthole and overcome the problem of large bottom clamping and leaving a foundation at the lower end.

[0047] It can be seen from the above usage scenarios that multiple inner cores 10 connected end to end can be quickly assembled, so as to quickly produce oxygen-absorbing inner core components according to different fracturing requirements, thereby improving the assembly effect and realizing a modular and standardized operation process.

[0048] Furthermore, a sealing layer 16 is provided outside the dielectric layer 14, and the sealing layer 16 is used to seal the dielectric layer 14. It can be understood that the sealing layer 16 is wrapped around the upper and lower ends and the circumference of the dielectric layer 14, and the sealing layer 16 can be a sealing film. The sealing layer 16 in the present application not only has the effect of water-proofing and moisture-proofing, but also has the function of encapsulating liquid oxygen. The electronic excitation unit 15 is arranged outside the sealing layer 16.

[0049] During the process of injecting liquid oxygen into the fracturing tube 20, in order to ensure safety, the fracturing tube 20 is usually placed in the blast hole for oxygen injection. At this time, the fracturing tube 20 is in an upright state most of the time. During the injection process, the liquid oxygen is split into the first liquid oxygen and the second liquid oxygen, wherein the first liquid oxygen flows along the axial direction of the liquid infusion tube 11 to the bottom of the fracturing tube 20 and slowly accumulates upward, and the second liquid oxygen infiltrates the dielectric layer 14 through the liquid outlet 12. Since liquid oxygen is a liquid, the dielectric layer 14 at the bottom of the fracturing tube 20 has sufficient time and a sufficient amount of liquid oxygen for adsorption, and although the dielectric layer 14 located above can absorb the second liquid oxygen, the second liquid oxygen will continue to flow downward under the action of gravity, resulting in poor adsorption effect of the dielectric 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, leaving sufficient time and a sufficient amount of liquid oxygen for the dielectric layer 14 above to adsorb, thereby improving the efficiency of the dielectric layer 14 in absorbing liquid oxygen.

[0050] Furthermore, the excitation medicine 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 medicine package burns under the spark generated by the ignition head, thereby igniting the liquid oxygen and realizing the rapid expansion of the liquid oxygen volume. In the present application, the ignition head is an electronic ignition head, and the electronic ignition head of the oxygen absorption inner core assembly is connected in parallel to the exciter.

[0051] Since liquid oxygen evaporates quickly, during the accumulation of the first liquid oxygen, the sealing layer 16 is used to encapsulate the uppermost medium layer 14 to prevent the liquid oxygen content from decreasing, thereby affecting precise fracturing.

[0052] Furthermore, the medium layer 14 is made of one or more of paper material, cotton material or plastic formable combustible and tempered medium.

[0053] Specifically, when the medium layer 14 is a paper material or a cotton material, such as toilet paper or cloth, the toilet paper or cloth is wrapped layer by layer around the infusion tube 11. After wrapping, a sealing film is wrapped around the outside of the medium layer 14 to form a sealing layer 16, and the electronic excitation unit 15 is fixed outside the sealing layer 16.

[0054] When the medium layer 14 is a combustible organic medium that can be plastically molded, the combustible organic medium is pressed into a cylindrical shape, and the liquid delivery tube 11 is arranged inside the combustible organic medium.

[0055] Specifically, the combustible organic medium is pressed using a pressing mold, which includes an upper mold and a lower mold 30 of the same structure, wherein an upper mold cavity is provided on a side of the upper mold opposite to the lower mold 30, and a lower mold cavity 31 is provided on a side of the lower mold 30 opposite to the upper mold. When the molds are closed, the upper mold cavity and the lower mold cavity 31 constitute a mold cavity, and a receiving half hole 32 is also provided on the opposite sides of the upper and lower molds 30. The receiving half hole 32 is arranged on both sides of the mold cavity. In the present embodiment, the mold cavity is cylindrical, and the receiving half hole 32 is arranged in the axial direction of the mold cavity.

[0056] When the medium layer 14 is made of a combustible organic medium, the combustible organic medium is first loaded 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 accommodating half holes 32, the combustible organic medium is continued to be loaded into the lower mold cavity 31, and the upper mold and the lower mold are molded together to compact the combustible organic medium to obtain the medium layer 14 with the infusion tube 11. After the pressing is completed, the sealing film is wrapped around the outside of the medium layer 14 to form a sealing layer 16, and the electronic excitation unit 15 is fixed outside the sealing layer 16.

[0057] In this embodiment, the sealing film also has the effect of preventing the flammable organic medium from being scattered.

[0058] The present application also provides a method for manufacturing a fracturing tube, comprising the following steps:

[0059] The length of the inner core assembly is determined according to the length of the fracturing tube 20, and the length of each inner core 10 is determined. The thickness of the dielectric layer 14 in each inner core 10 is confirmed based on the fracturing requirements.

[0060] When the medium layer 14 is made of paper material, the paper material is wound around the liquid infusion tube 11 layer by layer until the required thickness is reached.

[0061] When the medium layer 14 is a combustible organic medium, the medium layer 14 is manufactured using a pressing mold.

[0062] After the dielectric layer 14 is made, a sealing film is wrapped around the dielectric layer 14 formed by the paper material to form a sealing layer 16 . The sealing layer 16 wraps the upper and lower ends and circumference of the paper material to perform a packaging function and fix the electronic excitation unit 15 outside the sealing layer 16 .

[0063] Based on the required number and length of the inner cores 10 , the ends of a plurality of inner cores 10 are connected via quick connectors 13 to form an oxygen absorbing inner core assembly.

[0064] The oxygen absorption inner core 10 is placed in the fracturing tube 20, and the upper and lower ends of the fracturing tube 20 are sealed, and the electronic excitation units 15 of the multi-section oxygen absorption inner core assembly are connected in parallel to the exciter. A reaction petal 21 is arranged at the lower end of the fracturing tube 20, and the reaction petal 21 is arranged on the circumference of the fracturing tube 20, and the angle between the reaction petal 21 and the upper end of the fracturing tube 20 is an acute angle. The reaction petal 21 is made of semi-rigid material, such as PE, PVC material, and has a certain force deformation capacity. The reaction petal 21 can offset the upward movement trend caused by buoyancy to ensure that the fracturing tube 20 is fixed in the blast hole.

[0065] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bamboo-shaped oxygen-absorbing inner core component, characterized in that: include: An inner core (10), the inner core (10) comprising an infusion tube (11), a liquid outlet (12) being arranged on the circumference of the infusion tube (11), a quick connector (13) having a central through hole being arranged at the lower end of the infusion tube (11), and a medium layer (14) being arranged outside the infusion tube (11), the medium layer (14) being used to absorb liquid oxygen in the infusion tube (11); at least one electronic excitation unit (15), comprising an ignition head and an excitation medicine package, wherein the excitation medicine package is arranged outside the dielectric layer (14), and the ignition head is used to ignite the excitation medicine package; A plurality of the inner cores (10) are connected end to end via a quick connector (13).

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

3. The bamboo-shaped oxygen-absorbing inner core assembly according to claim 1, characterized in that: The excitation medicine package comprises 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.

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

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

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

7. A method for manufacturing a fracturing tube, using the bamboo-shaped oxygen-absorbing inner core component of claim 5, characterized in that: include: S10. Determine the length of the inner core assembly and the length of a single inner core (10) according to the length of the fracturing tube (20); S20. Wrapping the paper material layer by layer on the infusion tube (11), after the paper material is wrapped, wrapping the sealing film around the outside of the paper material to form a sealing layer (16); S30. After sealing, the excitation cartridge and the ignition head are fixed outside the sealing layer 16; S40. Connecting a plurality of inner cores (10) end to end through a quick connector (13) to form an oxygen absorption inner core assembly; S50. Place the oxygen absorption core assembly in the fracturing tube (20), and seal the upper and lower ends of the fracturing tube (20). A reaction petal (21) is provided at the lower end of the fracturing tube (20). The reaction petals (21) are arranged around the fracturing tube (20), and the reaction petals (21) are used to abut against the inside of the blast hole.

8. A method for manufacturing a fracturing tube, using the bamboo-shaped oxygen-absorbing inner core component of claim 6, characterized in that: include: S10. Determine the length of the inner core assembly and the length of a single inner core (10) according to the length of the fracturing tube (20); S20. The dielectric layer (14) is manufactured by using a pressing mold, wherein the pressing mold includes an upper mold having an upper mold cavity and a lower mold (30) having a lower mold cavity (31), wherein the upper mold and the lower mold (30) are combined to form a mold cavity, and both ends of the upper mold and the lower mold (30) are respectively provided with a receiving half hole (32) for accommodating the infusion tube (11); Filling the combustible organic medium into the lower mold cavity (31), placing the liquid infusion tube (11) in the receiving half hole (32) after preliminary compaction, then filling the combustible organic medium above the liquid infusion tube (11), and closing the mold to obtain the medium layer (14); S30. The dielectric layer (14) is wrapped with a sealing film to form a sealing layer (16), wherein the sealing layer (16) includes the upper and lower ends and the circumference of the paper material, and the excitation cartridge and the ignition head are fixed outside the sealing layer (16); S40. Connecting a plurality of inner cores (10) end to end through a quick connector (13) to form an oxygen absorption inner core assembly; S50. Place the oxygen absorption core assembly in the fracturing tube (20), and seal the upper and lower ends of the fracturing tube (20). A reaction petal (21) is provided at the lower end of the fracturing tube (20). The reaction petals (21) are arranged around the fracturing tube (20), and the reaction petals (21) are used to abut against the inside of the blast hole.

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