An internally inflated gas-induced fracture tube

Abstract

The present invention is applicable to the technical field of rock expansion fracturing equipment, and discloses an internally inflated gas fracturing tube, comprising: a liquid storage tube, a one-way valve assembly; the liquid storage tube has a closed gas containing space, and the upper end of the liquid storage tube is provided with an inflation hole connecting the gas containing space and the external space; the one-way inflation assembly includes a one-way valve body and an inflation tube connected to the one-way valve body; the one-way valve body is arranged in the gas containing space, and one end of the inflation tube is fixedly connected to the one-way valve body after passing through the inflation hole. Compared with the related art, the internally inflated gas fracturing tube of the present invention utilizes a structure in which a one-way valve is built into the liquid storage tube to realize inflation in the hole and automatic packaging. Complicated packaging processes are avoided, and therefore unsafe factors during packaging are also avoided. The filling operation is safe, and the filling success rate of the fracturing tube is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rock expansion fracturing equipment, and in particular relates to an internally inflated gas fracturing tube. Background Art

[0002] The carbon dioxide fracturing equipment uses liquid carbon dioxide to expand when heated, and then quickly releases high-pressure gas to break rocks or coal. Due to its many advantages such as controllable expansion capacity, great power, and no shock wave, it is widely used in urban renewal, urban construction, and mineral mining. The related technology involves a gas fracturing tube that can achieve in-hole inflation, which includes an expansion tube and an inflation head. The inflation head in the gas fracturing tube is encapsulated at the opening of the expansion tube, and is connected to the inflation end by an external filling device. The filling device fills the expansion tube with high-pressure gas through the inflation tube. After the filling is completed, the external filling device is disconnected, and the inflation end is clamped to avoid leakage, and the packaging is completed. That is, the related technology adopts the method of clamping the inflation end to achieve the packaging of the expansion tube after inflation. This method increases the packaging process and prolongs the gas filling time; and the use of this method may cause leakage, affecting the success rate of packaging.

[0003] Therefore, it is necessary to provide a new internal inflation gas fracturing tube to solve the above-mentioned technical problems. Summary of the invention

[0004] The present invention provides an internally inflated gas fracturing tube, aiming to solve the technical problems mentioned in the background technology.

[0005] The present invention is implemented as follows: an internally inflated gas fracturing tube comprises: a liquid storage tube and a one-way valve assembly; the liquid storage tube has a closed gas containing space, and the upper end of the liquid storage tube is provided with an inflation hole connecting the gas containing space and the external space; the one-way inflation assembly comprises a one-way valve body and an inflation tube connected to the one-way valve body; the one-way valve body is arranged in the gas containing space, and one end of the inflation tube passes through the inflation hole and is fixedly connected to the one-way valve body.

[0006] Preferably, the liquid storage tube is cylindrical as a whole, and comprises: a liquid storage tube body which together encloses the gas containing space, and a bottom seal and a top seal which are arranged in the liquid storage tube body and respectively located at both ends, the liquid storage tube body and the bottom seal are sealed and fixedly connected; the liquid storage tube body and the top seal are sealed and fixedly connected; the inflation hole passes through the top seal.

[0007] Preferably, the liquid storage tube body is a hollow cylinder with openings at both ends; the bottom seal comprises: a circular plate-shaped bottom seal 1, and an annular bottom seal 2 extending from the side wall of the bottom seal 1, the bottom seal 2 is fixedly connected to the inner wall of the liquid storage tube body, and the end of the bottom seal 1 away from the one-way valve body is flush with the lower end of the liquid storage tube body; the top seal comprises: a circular plate-shaped top seal 1, and an annular top seal 2 extending from the side wall of the top seal 1, the top seal 2 is fixedly connected to the inner wall of the liquid storage tube body, and the end of the top seal 1 away from the one-way valve body is flush with the upper end of the liquid storage tube body.

[0008] Preferably, the internally inflated gas fracturing tube further includes a lead and an igniter, wherein the igniter is disposed in the gas containing space, one end of the lead is connected to the igniter, and the other end of the lead passes through the upper end of the liquid storage tube and extends out of the liquid storage tube.

[0009] Preferably, the outer wall of the lead wire is sealed and fixedly connected to the liquid storage tube.

[0010] Preferably, the lead includes a positive electrode lead and a negative electrode lead, and the positive electrode lead and the negative electrode lead are arranged at intervals and are respectively located on opposite sides of the one-way valve assembly.

[0011] Preferably, the bottom seal member 1 and the bottom seal member 2 are connected by a circular arc transition; the top seal member 1 and the top seal member 2 are connected by a circular arc transition.

[0012] Preferably, the one-way valve body comprises: a first main valve body, a first connecting valve body, a first compression spring, and a first sphere; the first main valve body is provided with a first spring accommodating chamber and a first main valve body air inlet hole connected to the first spring accommodating chamber; the inner wall of the first spring accommodating chamber is provided with a first connecting internal thread, the first compression spring is arranged in the first spring accommodating chamber and the first sphere and the first compression spring are at an end away from the first main valve body air inlet hole; the first connecting valve body is provided with a first connecting valve body air inlet hole and a first control hole connected to the first connecting valve body air inlet hole, and the diameter value of the first control hole is smaller than the ball diameter value of the first sphere; the outer wall of one end of the first connecting valve body close to the first main valve body is provided with a first connecting external thread matching the first connecting internal thread, and one end of the first connecting valve body close to the first main valve body is fixedly connected to the first connecting valve body; the inflation tube is fixed in the air inlet hole of the first connecting valve body.

[0013] Preferably, the air inlet hole of the first main valve body is a cylindrical hole, the first spring accommodating cavity is a cylindrical hole, and the diameter of the air inlet hole of the first main valve body is smaller than the diameter of the first spring accommodating cavity.

[0014] Preferably, the one-way valve body includes: a second main valve body, a second valve core, and a second sealing ring; the second main valve body includes a second main valve body air inlet hole, a second control hole, and a second main valve body stroke hole formed in the second main valve body and connected in sequence, the second main valve body also includes a second main valve body filling hole formed in the second main valve body, the number of the second main valve body filling holes is 1-4, and the second main valve body filling hole is connected to the second control hole; the second control hole is a conical hole, and the second valve core is a conical shape adapted to the shape of the second control hole; the second sealing ring is sleeved on the outer wall of the second valve core, and the second valve core is arranged in the second control hole.

[0015] Compared with the related art, the internally inflated gas fracturing tube of the present invention utilizes a structure in which a one-way valve is built into a liquid storage tube to realize in-hole inflation and automatic packaging. The cumbersome packaging process is avoided, and thus the unsafe factors during packaging are also avoided. The filling operation is ensured to be safe, and the filling success rate of the fracturing tube is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an internally inflated gas fracturing tube of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall structure of a one-way valve assembly in an internally inflated gas fracturing tube of the present invention;

[0018] Figure 3 The figure is a schematic diagram of the overall structure of another one-way valve assembly in an internally inflated gas fracturing tube of the present invention.

[0019] In the figure:

[0020] Liquid storage tube 1, one-way valve assembly 2, lead wire 3, igniter 4;

[0021] Gas containing space 11, liquid storage tube body 12, bottom seal 13, top seal 14;

[0022] One-way valve body 21, inflation tube 22;

[0023] A positive electrode lead 31, a negative electrode lead 32;

[0024] Bottom seal one 131, bottom seal two 132;

[0025] Top sealing member 141, top sealing member 2 142, and inflation hole 143;

[0026] A first main valve body 211, a first connecting valve body 212, a first compression spring 213, and a first ball 214;

[0027] A first spring accommodating chamber 2111, a first main valve body air inlet hole 2112, and a first connecting internal thread 2113;

[0028] The first connecting valve body air inlet hole 2121 , the first control hole 2122 , and the first connecting external thread 2123 .

[0029] A second main valve body 0211, a second valve core 0212, and a second sealing ring 0213;

[0030] The second connecting valve body has an air inlet hole 02111, a second control hole 02112, a second main valve body travel hole 02113, and a second main valve body filling hole 02114. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] See also Figure 1-3 , an internally inflated gas fracturing tube, comprising: a liquid storage tube 1, a one-way valve assembly 2; the liquid storage tube 1 has a closed gas containing space 11, and the upper end of the liquid storage tube 1 is provided with a charging hole 143 connecting the gas containing space 11 and the external space; the one-way charging assembly comprises a one-way valve body 21 and a charging tube 22 connected to the one-way valve body 21; the one-way valve body 21 is arranged in the gas containing space 11, and one end of the charging tube 22 passes through the charging hole 143 and is fixedly connected to the one-way valve body 21.

[0033] The liquid storage tube 1 is cylindrical as a whole, and includes: a liquid storage tube body 12 that together encloses a gas containing space 11, and a bottom seal 13 and a top seal 14 that are arranged in the liquid storage tube body 12 and are respectively located at both ends. The liquid storage tube body 12 and the bottom seal 13 are sealed and fixedly connected; the liquid storage tube body 12 and the top seal 14 are sealed and fixedly connected; the inflation hole 143 runs through the top seal 14.

[0034] The liquid storage tube body 12 is a hollow cylinder with openings at both ends; the bottom seal 13 includes: a circular plate-shaped bottom seal 131, and a ring-shaped bottom seal 132 extending from the side wall of the bottom seal 131, the bottom seal 132 is fixedly connected to the inner wall of the liquid storage tube body 12, and the end of the bottom seal 131 away from the one-way valve body 21 is flush with the lower end of the liquid storage tube body 12; the top seal 14 includes: a circular plate-shaped top seal 141, and a ring-shaped top seal 142 extending from the side wall of the top seal 141, the top seal 142 is fixedly connected to the inner wall of the liquid storage tube body 12, and the end of the top seal 141 away from the one-way valve body 21 is flush with the upper end of the liquid storage tube body 12.

[0035] The internally inflated gas fracturing tube further comprises a lead 3 and an igniter 4. The igniter 4 is arranged in the gas containing space 11. One end of the lead 3 is connected to the igniter 4. The other end of the lead 3 passes through the upper end of the liquid storage tube 1 and extends out of the liquid storage tube 1.

[0036] The outer wall of the lead wire 3 is sealed and fixedly connected to the liquid storage tube 1 .

[0037] The lead 3 includes a positive electrode lead 31 and a negative electrode lead 32 . The positive electrode lead 31 and the negative electrode lead 32 are arranged at intervals and are located at opposite sides of the one-way valve assembly 2 .

[0038] The bottom seal 1 131 and the bottom seal 2 132 are connected by a circular arc transition; the top seal 1 141 and the top seal 2 142 are connected by a circular arc transition.

[0039] It should be noted that the “upper end of the liquid storage tube” and “lower end of the liquid storage tube” mentioned in the present application are based on the up and down directions when the gas fracturing tube is placed in the fracturing hole.

[0040] It should be noted that the one-way valve body 21 may have various structures.

[0041] As an embodiment of the present application, see Figure 2 The one-way valve body 21 comprises: a first main valve body 211, a first connecting valve body 212, a first compression spring 213, and a first sphere 214; the first main valve body 211 is provided with a first spring accommodating chamber 2111 and a first main valve body air inlet hole 2112 communicating with the first spring accommodating chamber 2111; the inner wall of the first spring accommodating chamber 2111 is provided with a first connecting internal thread 2113, the first compression spring 213 is arranged in the first spring accommodating chamber 2111 and the first sphere 214 and the first compression spring 213 are at one end away from the first main valve body air inlet hole 2112; the first connecting valve The body 212 is provided with a first connecting valve body air inlet hole 2121 and a first control hole 2122 connected to the first connecting valve body air inlet hole 2121, and the diameter value of the first control hole 2122 is smaller than the ball diameter value of the first sphere 214; the outer wall of one end of the first connecting valve body 212 close to the first main valve body 211 is provided with a first connecting external thread 2123 matching with the first connecting internal thread 2113, and the end of the first connecting valve body 212 close to the first main valve body 211 is fixedly connected to the first connecting valve body 212; the inflation tube 22 is fixed in the first connecting valve body air inlet hole 2121.

[0042] The first main valve body air inlet hole 2112 is a cylindrical hole, the first spring accommodating chamber 2111 is a cylindrical hole, and the diameter of the first main valve body air inlet hole 2112 is smaller than the diameter of the first spring accommodating chamber 2111, so as to form a step for supporting the first compression spring 213. The first ball 214 abuts against the first control hole 2122 under the action of the first compression spring 213, and is used to block the first control hole 2122.

[0043] When filling with gas, high-pressure gas enters through the air inlet hole 2121 of the first connecting valve body, and pushes the first sphere 214 to move under the action of pressure, and compresses the first compression spring 213. At this time, the first control hole 2122 is opened, and the gas enters the liquid storage tube 1 through the control hole and the air inlet hole 2112 of the first main valve body. When the filling amount is reached, inflation is stopped, and the first sphere 214 moves under the action of the compression spring and the high-pressure gas in the liquid storage tube 1, and blocks the first control hole 2122 to achieve automatic packaging.

[0044] As another embodiment of the present application, see Figure 3 The one-way valve body 21 includes: a second main valve body 0211, a second valve core 0212, and a second sealing ring 0213; the second main valve body 0211 includes a second main valve body air inlet hole 02111, a second control hole 02112, and a second main valve body stroke hole 02113 formed in the second main valve body 0211 and connected in sequence, the second main valve body 0211 also includes a second main valve body filling hole 02114 formed in the second main valve body 0211, the second main valve body filling hole 02114 is 1-4, and the second main valve body filling hole 02114 is connected to the second control hole 02112; the second control hole 02112 is a conical hole, and the second valve core 0212 is a conical shape adapted to the shape of the second control hole 02112; the second sealing ring 0213 is sleeved on the outer wall of the second valve core 0212, and the second valve core 0212 is arranged in the second control hole 02112.

[0045] When filling gas, high-pressure gas enters from the gas inlet hole 02111 of the second connecting valve body, and pushes the second valve core 0212 to move under the action of pressure, and the second valve core 0212 moves to the second main valve body stroke hole 02113. At this time, the second control hole 02112 is connected with the second main valve body charging hole 02114, and the high-pressure gas enters the liquid storage tube 1 from the second main valve body charging hole 02114. When the filling amount requirement is reached, the high-pressure gas is stopped from being filled. Under the action of the high-pressure gas in the liquid storage tube 1, the second valve core 0212 moves toward the second control hole 02112 and blocks the second control hole 02112 and the second main valve body charging hole 02114, thereby realizing automatic packaging. The conical shapes of the second valve core 0212 and the second control hole 02112 cooperate with each other, which is conducive to stable blocking, and the second sealing ring 0213 is used to improve the sealing performance.

[0046] The filling process of the internally inflated gas fracturing tube of the present invention is as follows: connect the external filling device to the inflation tube 22, and the filling device fills the liquid storage tube 1 with high-pressure gas through the inflation tube 22 and the one-way valve body 21. After the filling is completed, disconnect the external filling device. Due to the one-way flow of the one-way valve body 21, the filling gas entering the liquid storage tube 1 cannot escape from the one-way valve in the reverse direction, so there is no need for packaging, avoiding the cumbersome packaging process in the background technology, and thus avoiding the unsafe factors during packaging. The filling operation is guaranteed to be safe, and the filling success rate of the fracturing tube is improved at the same time.

[0047] It should be noted that only two one-way valve structures are listed in the specific embodiments of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any structure that uses a one-way valve to achieve inflation in a fractured pipe hole or any modification, equivalent substitution and improvement made within the spirit and principle of the invention should be included in the protection scope of the present invention.

[0048] Compared with the related art, the internally inflated gas fracturing tube of the present invention utilizes a structure in which a one-way valve is built into a liquid storage tube to realize in-hole inflation and automatic packaging. The cumbersome packaging process is avoided, and thus the unsafe factors during packaging are also avoided. The filling operation is ensured to be safe, and the filling success rate of the fracturing tube is improved.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An internally inflated gas-fracturing tube, characterized in that: include: A liquid storage tube and a one-way valve assembly; the liquid storage tube has a closed gas containing space, and the upper end of the liquid storage tube is provided with an inflation hole connecting the gas containing space and the external space; the one-way valve assembly includes a one-way valve body and an inflation tube connected to the one-way valve body; the one-way valve body is arranged in the gas containing space, and one end of the inflation tube passes through the inflation hole and is fixedly connected to the one-way valve body; the one-way valve body includes: a second main valve body, a second valve core, and a second sealing ring; the second main valve body includes a second main valve body air inlet hole, a second control hole, and a second main valve body stroke hole formed in the second main valve body and connected in sequence, the second main valve body also includes a second main valve body filling hole formed in the second main valve body, the second main valve body filling hole is 1-4, and the second main valve body filling hole is connected to the second control hole; the second control hole is a conical hole, and the second valve core is a conical shape adapted to the shape of the second control hole; the second sealing ring is sleeved on the outer wall of the second valve core, The second valve core is arranged in the second control hole; or, the one-way valve body includes: a first main valve body, a first connecting valve body, a first compression spring, and a first sphere; the first main valve body is provided with a first spring accommodating chamber and a first main valve body air inlet hole connected to the first spring accommodating chamber; the inner wall of the first spring accommodating chamber is provided with a first connecting internal thread, the first compression spring is arranged in the first spring accommodating chamber and the first sphere and the first compression spring are at one end away from the first main valve body air inlet hole; the first connecting valve body is provided with a first connecting valve body air inlet hole and a first control hole connected to the first connecting valve body air inlet hole, and the diameter value of the first control hole is smaller than the ball diameter value of the first sphere; the outer wall of one end of the first connecting valve body close to the first main valve body is provided with a first connecting external thread matching the first connecting internal thread, and one end of the first connecting valve body close to the first main valve body is fixedly connected to the first connecting valve body; the inflation tube is fixed in the air inlet hole of the first connecting valve body.

2. The internally inflated gas fracturing tube according to claim 1, characterized in that: The liquid storage tube is cylindrical as a whole, and includes: a liquid storage tube body that together encloses the gas containing space, and a bottom seal and a top seal that are arranged in the liquid storage tube body and are respectively located at both ends, the liquid storage tube body and the bottom seal are sealed and fixedly connected; the liquid storage tube body and the top seal are sealed and fixedly connected; the inflation hole passes through the top seal.

3. The internally inflated gas fracturing tube according to claim 2, characterized in that: The liquid storage tube body is a hollow cylinder with openings at both ends; the bottom seal comprises: a circular plate-shaped bottom seal 1, and an annular bottom seal 2 extending from the side wall of the bottom seal 1, the bottom seal 2 is fixedly connected to the inner wall of the liquid storage tube body, and the end of the bottom seal 1 away from the one-way valve body is flush with the lower end of the liquid storage tube body; the top seal comprises: a circular plate-shaped top seal 1, and an annular top seal 2 extending from the side wall of the top seal 1, the top seal 2 is fixedly connected to the inner wall of the liquid storage tube body, and the end of the top seal 1 away from the one-way valve body is flush with the upper end of the liquid storage tube body.

4. The internally inflated gas fracturing tube according to claim 3, characterized in that: The internally inflated gas fracturing tube also includes a lead and an igniter. The igniter is arranged in the gas containing space. One end of the lead is connected to the igniter, and the other end of the lead passes through the upper end of the liquid storage tube and extends out of the liquid storage tube.

5. The internally inflated gas fracturing tube according to claim 4, characterized in that: The outer wall of the lead wire is sealed and fixedly connected to the liquid storage tube.

6. The internally inflated gas fracturing tube according to claim 5, characterized in that: The lead includes a positive electrode lead and a negative electrode lead, and the positive electrode lead and the negative electrode lead are arranged at intervals and are respectively located on two opposite sides of the one-way valve assembly.

7. The internally inflated gas fracturing tube according to claim 6, characterized in that: The bottom seal part 1 and the bottom seal part 2 are connected by a circular arc transition; the top seal part 1 and the top seal part 2 are connected by a circular arc transition.

8. The internally inflated gas fracturing tube according to claim 1, characterized in that: The air inlet hole of the first main valve body is a cylindrical hole, the first spring accommodating cavity is a cylindrical hole, and the diameter of the air inlet hole of the first main valve body is smaller than the diameter of the first spring accommodating cavity.

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