Gas fracturing and gas extraction integrated device

Abstract

The utility model provides a gas fracturing and gas extraction integrated device which comprises a fracturing and extraction assembly, a gas extraction assembly and a gas extraction assembly. The gas compression assembly communicates with the vent hole of the fracturing extraction assembly through a pipeline and is used for gas fracturing; the gas extraction assembly communicates with the vent hole of the fracturing extraction assembly through a pipeline and is used for gas extraction; and the switching assembly communicates with the vent hole of the fracturing extraction assembly, the gas compression assembly and the gas extraction assembly through pipelines and is used for switching one of the gas compression assembly and the gas extraction assembly to communicate with the fracturing extraction assembly. According to the utility model, the gas fracturing function and the gas extraction function are integrated, gas in a drill hole can be extracted immediately without taking out a pipeline after the coal body gas fracturing process is carried out, continuous coal body fracturing and gas extraction are realized, and the safety of coal mining and the gas extraction efficiency are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal seam gas extraction equipment, and particularly relates to an integrated device for gas fracturing and gas extraction. Background Technique

[0002] Gas is usually stored in coal seams and gradually leaks during the coal mining process, which is likely to cause disasters such as gas explosion and coal and gas outburst; of course, not all gas is a disadvantage. After being extracted and recovered, gas can be used as a high-quality energy source for full utilization.

[0003] Generally, there are two forms of gas storage in coal bodies: adsorbed state and free state; under certain conditions, adsorbed gas can be converted into free gas; currently, the traditional methods for preventing and controlling gas disasters mainly focus on pre-extracting coal seam gas. However, the extraction efficiency is low and it is difficult to quickly convert adsorbed gas into free gas, making the pre-extraction method of coal seam gas have the disadvantages of too long pre-extraction time, low efficiency, large workload, high energy consumption, and difficult mining connection.

[0004] In order to accelerate the separation of gas from the coal body, the existing technology usually adopts hydraulic fracturing technology. By drilling holes in the coal seam and injecting high-pressure liquid, the coal body is fractured. To a certain extent, the hydraulic fracturing technology makes the coal seam fractures develop and increases the coal seam permeability, but it still has the disadvantages of low fracturing efficiency and easy environmental pollution; at the same time, the water used for fracturing will soften the coal body, cause great disturbance to the coal body, and is likely to cause serious accidents such as hole collapse.

[0005] Therefore, generally speaking, the existing gas extraction technologies mainly have the following disadvantages:

[0006] 1. At present, the method of hydraulic fracturing is mostly used in coal mines at home and abroad. The hydraulic fracturing technology not only has low efficiency, but also softens the coal, causes large disturbances to the coal body, and is prone to serious accidents such as large hole collapses; 2. The hydraulic fracturing technology requires a large amount of water, which is easy to cause water accumulation in the roadway, and may face environmental pollution problems such as difficult slag discharge and fracturing fluid discharge after fracturing; 3. Hydraulic fracturing will reduce the gas permeability of the coal seam and have an adverse impact on the adsorption and desorption effect of gas; at the same time, water will remain in the coal seam fissures, easily forming a "water lock effect", which will block the gas migration channel and hinder the gas extraction; 4. Some existing fracturing devices for improving gas extraction effect need to remove the fracturing pipeline after coal body fracturing and then carry out gas extraction. The above method may cause gas to flow into the roadway, resulting in safety accidents such as gas explosion; moreover, if gas extraction is not carried out in time after fracturing, the fissures may close under the action of in-situ stress, resulting in a decrease in gas extraction efficiency; therefore, the existing methods have great defects in terms of safety and extraction efficiency; 5. At present, the method of gas driving is often used in preventing and controlling gas outbursts in China. This method is through the way of "pressurizing one hole and extracting gas from multiple holes". It has many drill holes, causes large disturbances to the coal seam, and needs to frequently replace pipelines, resulting in high overall cost and cumbersome operation.

[0007] In summary, the existing gas extraction technology can no longer meet the needs of the current industry development; how to carry out coal mining and gas extraction safely, environmentally friendly, efficiently and reliably, and explore new coal mining and gas extraction devices and methods has become an urgent problem to be solved in coal mining engineering. Utility Model Content

[0008] The utility model provides an integrated device for gas fracturing and gas extraction to solve the problems of low extraction efficiency and poor safety of the existing gas extraction device.

[0009] To solve the above problems, the utility model provides an integrated device for gas fracturing and gas extraction, including: a fracturing and extraction component with a ventilation hole arranged in the coal seam; the fracturing and extraction component is hermetically matched with the coal seam; a gas compression component is connected to the ventilation hole of the fracturing and extraction component through a pipeline, and is used to drive gas with a set pressure to enter the coal seam from the ventilation hole for gas fracturing; a gas extraction component is connected to the ventilation hole of the fracturing and extraction component through a pipeline, and is used to extract the gas between the fracturing and extraction component and the coal seam from the ventilation hole into the gas extraction component for gas extraction; a switching component is respectively connected to the ventilation hole of the fracturing and extraction component, the gas compression component, and the gas extraction component through pipelines, and is used to switch one of the gas compression component and the gas extraction component to be connected to the fracturing and extraction component.

[0010] Further, the integrated device for gas fracturing and gas drainage also includes a pressure measurement component. The pressure measurement component is connected to the vent hole of the fracturing and drainage component through a pipeline, and is used to measure the air pressure between the fracturing and drainage component and the coal seam.

[0011] Further, the integrated device for gas fracturing and gas drainage also includes a control terminal. The control terminal is electrically connected to the pressure measurement component, the switching component, the gas compression component, and the gas drainage component respectively, so as to control the coordinated operation of the gas compression component, the gas drainage component, and the switching component.

[0012] Further, the pressure measurement component includes a first three-way valve and a pressure sensor; the fracturing and drainage component includes a main pipeline connected to the vent hole. The first three-way valve is arranged on the main pipeline, and the inlet and one outlet are respectively connected to the main pipeline. The pressure sensor is arranged on the pipeline connected to the other outlet of the first three-way valve and is used to detect the pressure.

[0013] Further, the integrated device for gas fracturing and gas drainage also includes a pressure relief pipe. One end of the pressure relief pipe is connected to the other outlet of the first three-way valve, and the other end is connected to the outside for exhausting and relieving pressure; the integrated device for gas fracturing and gas drainage also includes a switch valve. The switch valve is arranged on the main pipeline and is used to control the opening and closing of the main pipeline.

[0014] Further, the switching component includes a second three-way valve; the fracturing and drainage component includes a main pipeline connected to the vent hole. The first port of the second three-way valve is connected to the main pipeline; the integrated device for gas fracturing and gas drainage also includes a switchable gas compression pipeline and a switchable gas drainage pipeline. One end of the gas compression pipeline is connected to the second port of the second three-way valve, and the other end is connected to the gas compression component; one end of the gas drainage pipeline is connected to the third port of the second three-way valve, and the other end is connected to the gas drainage component.

[0015] Further, the switching component also includes a first solenoid valve and a second solenoid valve. The first solenoid valve is arranged on the gas compression pipeline and is used to control the on-off of the gas compression pipeline; the second solenoid valve is arranged on the gas drainage pipeline and is used to control the on-off of the gas drainage pipeline; the integrated device for gas fracturing and gas drainage also includes a control terminal. The second three-way valve, the first solenoid valve, and the second solenoid valve are respectively electrically connected to the control terminal.

[0016] Further, the gas drainage component includes: a gas storage tank and a gas drainage pump. The gas storage tank is used to collect and store gas; the gas drainage pump is connected to the vent hole of the fracturing and drainage component and the gas storage tank through pipelines respectively, and is used to extract the gas between the fracturing and drainage component and the coal seam from the vent hole into the gas storage tank.

[0017] Furthermore, the gas compression assembly includes a gas compression pump and a compressed gas cylinder. The compressed gas cylinder is used to store the gas for fracturing. The gas compression pump is connected to the ventilation holes of the fracturing extraction assembly and the compressed gas cylinder through pipelines respectively, and is used to drive the gas to enter the coal seam from the ventilation holes according to the set pressure for gas fracturing.

[0018] Furthermore, the fracturing extraction assembly includes a plurality of packers, seals, and a porous pipeline with a plurality of ventilation holes. Fracturing holes are formed in the coal seam through drilling. One end of the porous pipeline is connected to the switching assembly through a pipeline, and the other end is located in the fracturing hole. The plurality of ventilation holes are arranged at intervals along the axial direction of the porous pipeline at the other end. The seal is arranged at one end of the porous pipeline and is in sealing cooperation with the orifice of the fracturing hole to seal the fracturing hole. The plurality of packers are arranged at intervals along the axial direction of the porous pipeline and are in sealing cooperation with the inner wall of the fracturing hole to divide the fracturing hole into a plurality of fracturing cavities arranged at intervals. At least one fracturing cavity is communicated with at least one ventilation hole.

[0019] Applying the technical solution of the present utility model, the present utility model provides an integrated device for gas fracturing and gas drainage, including: a fracturing extraction assembly having ventilation holes arranged in the coal seam; the fracturing extraction assembly is in sealing cooperation with the coal seam; a gas compression assembly, which is connected to the ventilation holes of the fracturing extraction assembly through pipelines and is used to drive the gas with a set pressure to enter the coal seam from the ventilation holes for gas fracturing; a gas drainage assembly, which is connected to the ventilation holes of the fracturing extraction assembly through pipelines and is used to extract the gas between the fracturing extraction assembly and the coal seam from the ventilation holes into the gas drainage assembly for gas drainage; a switching assembly, which is connected to the ventilation holes of the fracturing extraction assembly, the gas compression assembly, and the gas drainage assembly through pipelines respectively, and is used to switch one of the gas compression assembly and the gas drainage assembly to be connected to the fracturing extraction assembly.

[0020] The utility model realizes the integration of gas fracturing and gas drainage functions by setting a switching component to switch the gas compression component and the gas drainage component to work separately. After the gas fracturing of the coal body, the pipeline does not need to be taken out, and the gas in the borehole can be immediately drained, realizing the continuous gas fracturing and gas drainage of the coal body, effectively preventing gas from leaking into the roadway, avoiding safety accidents such as gas explosion, and further improving the safety of coal mining and the efficiency of gas drainage; by setting a gas compression component, the gas fracturing technology is used to replace the common hydraulic fracturing technology, which can effectively avoid a series of technical problems brought by the hydraulic fracturing technology; through the gas fracturing technology, it can ensure good fracturing effect on the coal seam, efficiently fracture the coal body underground in the coal mine, and minimize pollution, disturbance and danger to achieve the ideal purpose; the gas fracturing and gas drainage integrated device proposed by the utility model has a simple structure and low cost, is convenient for moving, installing and disassembling, and at the same time has simple operation, does not require too much manpower and can be recycled, has good economic benefits, and is suitable for large-scale popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments and descriptions thereof are used to explain the utility model and do not constitute an improper limitation of the utility model. In the drawings:

[0022] Figure 1 The specific structural schematic diagram of the gas fracturing and gas drainage integrated device provided by the embodiment of the utility model is shown.

[0023] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0024] 10, fracturing and drainage assembly; 11, packer; 12, seal; 13, porous pipeline; 131, ventilation hole;

[0025] 20, gas compression assembly; 21, gas compression pump; 22, compressed gas cylinder;

[0026] 30, gas drainage assembly; 31, gas drainage pump; 32, gas storage tank;

[0027] 40, switching component; 41, second three-way valve; 42, first solenoid valve; 43, second solenoid valve;

[0028] 50, pressure measurement component; 51, first three-way valve; 52, pressure sensor;

[0029] 60, control terminal;

[0030] 70, main pipeline;

[0031] 80, switch valve;

[0032] 90. Gas compression pipeline;

[0033] 100. Gas drainage pipeline;

[0034] 110. Fracturing hole; 111. Fracturing cavity. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] As Figure 1 shown, the embodiment of the present invention provides an integrated device for gas fracturing and gas drainage, including: a fracturing and drainage assembly 10 having a ventilation hole 131 provided in a coal seam; the fracturing and drainage assembly 10 is hermetically fitted with the coal seam; a gas compression assembly 20 is connected to the ventilation hole 131 of the fracturing and drainage assembly 10 through a pipeline and is used to drive gas with a set pressure to enter the coal seam from the ventilation hole 131 for gas fracturing; a gas drainage assembly 30 is connected to the ventilation hole 131 of the fracturing and drainage assembly 10 through a pipeline and is used to extract the gas between the fracturing and drainage assembly 10 and the coal seam to enter the gas drainage assembly 30 from the ventilation hole 131 for gas drainage; a switching assembly 40 is connected to the ventilation hole 131 of the fracturing and drainage assembly 10, the gas compression assembly 20, and the gas drainage assembly 30 through pipelines respectively and is used to switch one of the gas compression assembly 20 and the gas drainage assembly 30 to be connected to the fracturing and drainage assembly 10.

[0037] The utility model switches the gas compression component 20 and the gas drainage component 30 to work respectively through the setting of the switching component 40, integrating the functions of gas fracturing and gas drainage. After the process of gas fracturing the coal body, there is no need to take out the pipeline, and the gas in the borehole can be immediately drained, realizing the continuous progress of coal body fracturing and gas drainage, effectively preventing gas from leaking into the roadway, avoiding safety accidents such as gas explosion, and further improving the safety of coal mine mining and the efficiency of gas drainage; by setting the gas compression component 20, using gas fracturing technology to replace the common hydraulic fracturing technology, a series of technical problems brought by the hydraulic fracturing technology can be effectively avoided; through the gas fracturing technology, it can ensure good fracturing effect on the coal seam, efficiently fracture the coal body underground in the coal mine, and minimize pollution, disturbance and danger, achieving the ideal purpose; the gas fracturing and gas drainage integrated device proposed by the utility model has a simple structure and low cost, is convenient for moving, installing and disassembling, and at the same time has simple operation, does not require too much manpower and can be recycled, with good economic benefits and is suitable for large-scale popularization and use.

[0038] As Figure 1 shown, the gas fracturing and gas drainage integrated device further includes a pressure measurement component 50. The pressure measurement component 50 is connected to the ventilation hole 131 of the fracturing and drainage component 10 through a pipeline for measuring the air pressure between the fracturing and drainage component 10 and the coal seam.

[0039] By setting the pressure measurement component 50, the real-time monitoring of the air pressure between the fracturing and drainage component 10 and the coal seam is realized, enabling the subsequent project to flexibly and timely start and stop the gas compression component 20 and the gas drainage component 30 according to the pressure data, thereby controlling the gas concentration in the borehole and reducing the danger of mining.

[0040] As Figure 1 shown, the gas fracturing and gas drainage integrated device further includes a control terminal 60. The control terminal 60 is electrically connected to the pressure measurement component 50, the switching component 40, the gas compression component 20 and the gas drainage component 30 respectively to control the coordinated work of the gas compression component 20, the gas drainage component 30 and the switching component 40.

[0041] By setting the control terminal 60, it provides a structural support for the subsequent intelligent control of the coordinated work of the gas compression component 20, the gas drainage component 30 and the switching component 40.

[0042] In a specific embodiment of the utility model, the control terminal 60 includes a display screen for displaying the working conditions of the gas compression component 20, the gas drainage component 30 and the switching component 40 to the staff in real time.

[0043] As Figure 1As shown in the figure, the pressure measurement assembly 50 includes a first three-way valve 51 and a pressure sensor 52; the fracturing and gas drainage assembly 10 includes a main pipeline 70 communicated with the ventilation hole 131. The first three-way valve 51 is arranged on the main pipeline 70, and the inlet and one outlet are respectively communicated with the main pipeline 70. The pressure sensor 52 is arranged on the pipeline communicated with the other outlet of the first three-way valve 51 for detecting the pressure. Such an arrangement not only simplifies the structure of the pressure measurement assembly 50, but also makes the pressure measurement result of the pressure measurement assembly 50 more reliable and accurate.

[0044] It should be noted that in a specific embodiment of the present utility model, the integrated device for gas fracturing and gas drainage further includes a flow sensor. The pressure sensor 52 and the flow sensor are respectively connected to the control terminal 60 through wires, convert the collected electrical signals into digital signals, and display them on the display screen of the control terminal 60. The control terminal 60 detects the gas fracturing and the flow through the set program. When the set value is reached, the control terminal 60 sends control instructions to the gas compression assembly 20, the gas drainage assembly 30, and the switching assembly 40 to control the alternation and stop of gas fracturing and gas drainage.

[0045] Specifically, the integrated device for gas fracturing and gas drainage further includes a pressure relief pipe. One end of the pressure relief pipe is communicated with the other outlet of the first three-way valve 51, and the other end is communicated with the outside for exhausting and relieving pressure; as Figure 1 shown in the figure, the integrated device for gas fracturing and gas drainage further includes a switch valve 80. The switch valve 80 is arranged on the main pipeline 70 for controlling the opening and closing of the main pipeline 70.

[0046] By arranging the pressure relief pipe, the exhaust and pressure relief of the pipeline are realized, thereby ensuring the safety of the gas fracturing process and the controllability of the fracturing pressure; by arranging the switch valve 80, the effective control of the opening and closing of the main pipeline 70 is realized; in actual use, the switch valve 80 can adopt a common solenoid valve to facilitate subsequent electrical connection with the control terminal 60 to realize overall automatic control.

[0047] As Figure 1 shown in the figure, the switching assembly 40 includes a second three-way valve 41; the fracturing and gas drainage assembly 10 includes a main pipeline 70 communicated with the ventilation hole 131. The first port of the second three-way valve 41 is communicated with the main pipeline 70; the integrated device for gas fracturing and gas drainage further includes a switchable gas compression pipeline 90 and a switchable gas drainage pipeline 100. One end of the gas compression pipeline 90 is communicated with the second port of the second three-way valve 41, and the other end is communicated with the gas compression assembly 20; one end of the gas drainage pipeline 100 is communicated with the third port of the second three-way valve 41, and the other end is communicated with the gas drainage assembly 30. Such an arrangement not only ensures the working reliability of the switching assembly 40, but also makes the structure of the switching assembly 40 simple, facilitating subsequent procurement, installation, replacement and maintenance.

[0048] It should be noted that during actual use, the sizes and specific installation positions of the main pipeline 70, the gas compression pipeline 90, and the gas drainage pipeline 100 can be set flexibly and reasonably according to the space and usage requirements in the actual roadway; in addition, the specific structures and sizes of the second three-way valve 41 and the first three-way valve 51 can also be appropriately improved according to actual usage requirements.

[0049] As Figure 1 shown, the switching assembly 40 further includes a first solenoid valve 42 and a second solenoid valve 43. The first solenoid valve 42 is arranged on the gas compression pipeline 90 to control the on / off of the gas compression pipeline 90; the second solenoid valve 43 is arranged on the gas drainage pipeline 100 to control the on / off of the gas drainage pipeline 100; the integrated gas fracturing and gas drainage device further includes a control terminal 60, and the second three-way valve 41, the first solenoid valve 42, and the second solenoid valve 43 are respectively electrically connected to the control terminal 60. With this setting, the control terminal 60 can control the on / off of the gas compression pipeline 90 and the gas drainage pipeline 100 with a simple structure.

[0050] As Figure 1 shown, the gas drainage assembly 30 includes: a gas storage tank 32 and a gas drainage pump 31. The gas storage tank 32 is used to collect and store gas; the gas drainage pump 31 is connected to the vent hole 131 of the fracturing and drainage assembly 10 and the gas storage tank 32 through pipelines respectively, and is used to extract the gas between the fracturing and drainage assembly 10 and the coal seam and enter the gas storage tank 32 through the vent hole 131. With this setting, the gas drainage assembly 30 realizes the extraction and collection of gas, avoiding the waste of gas resources; at the same time, it is also convenient for subsequent treatment and purification of the collected gas.

[0051] As Figure 1 shown, the gas compression assembly 20 includes: a gas compression pump 21 and a compressed gas cylinder 22. The compressed gas cylinder 22 is used to store the gas for fracturing; the gas compression pump 21 is connected to the vent hole 131 of the fracturing and drainage assembly 10 and the compressed gas cylinder 22 through pipelines respectively, and is used to drive the gas to enter the coal seam from the vent hole 131 according to the set pressure for gas fracturing. With this setting, the structure of the gas compression assembly 20 is simplified and its working reliability is ensured.

[0052] In a specific embodiment of the present invention, the compressed gas cylinder 22 adopts a nitrogen gas cylinder, and nitrogen is used as the gas for fracturing, which is safe and low-cost.

[0053] It should be noted that during actual use, after the last gas fracturing is carried out, the compressed gas cylinder 22 should be completely closed in time to prevent the leakage of high-pressure gas in the compressed gas cylinder 22 and avoid the occurrence of safety hazards.

[0054] As Figure 1 shown, the fracturing and gas drainage assembly 10 includes a plurality of packers 11, a seal 12, and a porous pipeline 13 having a plurality of ventilation holes 131; a fracturing hole 110 is formed in the coal seam through drilling. One end of the porous pipeline 13 is connected to the switching assembly 40 through a pipeline, and the other end is located in the fracturing hole 110. The plurality of ventilation holes 131 are arranged at intervals along the axial direction of the porous pipeline 13 at the other end of the porous pipeline 13; the seal 12 is arranged at one end of the porous pipeline 13 and is in sealing cooperation with the orifice of the fracturing hole 110 to seal the fracturing hole 110; the plurality of packers 11 are arranged at intervals along the axial direction of the porous pipeline 13 and are in sealing cooperation with the inner wall of the fracturing hole 110 to divide the fracturing hole 110 into a plurality of spaced-apart fracturing chambers 111, and at least one fracturing chamber 111 is communicated with at least one ventilation hole 131.

[0055] By setting the specific structure of the fracturing and gas drainage assembly 10, the good airtightness of the fracturing hole 110 is ensured, so that a sealed space is formed inside the fracturing hole 110, the gas fracturing effect is enhanced, and the gas is prevented from flowing into the roadway, realizing the safe and efficient coal body fracturing and gas drainage in the coal mine underground; in addition, after ensuring the good fracturing effect of one fracturing hole 110 on the coal body, it is possible to perform coal body fracturing and gas drainage without drilling too many fracturing holes 110 during the coal mine mining process, avoiding problems such as large disturbance to the coal seam due to too many drill holes.

[0056] It should be noted that: drill holes at the mining face, connect the porous pipeline 13 with the packer 11 and extend it into the fracturing hole 110, and use the seal 12 to seal the orifice for multi-stage fracturing; connect the porous pipeline 13 with the gas compression assembly 20 through the main pipeline 70; the compressed gas cylinder 22 is used for gas supply, and the gas compression pump 21 connected to the compressed gas cylinder 22 is used to provide high-pressure gas. The first solenoid valve 42 controls the start and stop of fracturing by controlling the on-off of the gas compression pipeline 90.

[0057] Now, the specific working process and principle of the present invention will be described in detail as follows:

[0058] The main purpose of the integrated technology of gas fracturing and gas drainage is to effectively combine gas fracturing and gas drainage. After drilling holes at the mining face, extend the porous pipeline 13 into the fracturing hole 110, connect and install the pipeline, and perform sealing to start gas fracturing; after the coal body is fractured, the gas quickly flows out, and through the switching assembly 40, switch to the gas drainage assembly 30 to perform gas drainage, which can not only prevent gas leakage but also perform efficient drainage;

[0059] Based on the above principle, the utility model injects nitrogen into the fracturing hole 110 through the gas compression assembly 20, and fractures the coal seam by increasing the air pressure. When the air pressure reaches the fracture pressure of the coal seam and cracks begin to appear in the coal seam, the air pressure in the system will suddenly decrease, and the measured pressure of the pressure sensor 52 will rapidly drop. The control terminal 60 receives the pressure change signal, and the control terminal 60 issues an instruction through the designed program to automatically close the first solenoid valve 42 and the gas compression assembly 20. After 1 second, the second solenoid valve 43 and the gas drainage assembly 30 are opened to extract all the gas in the coal seam. Subsequently, gas separation treatment is carried out to obtain gas with a higher purity. After this gas drainage is completed, that is, when the reading of the flow sensor drops to a certain standard (or when the measured pressure of the pressure sensor 52 drops to a certain standard), the control terminal 60 receives the change signal, and the control terminal 60 issues an instruction through the designed program to close the second solenoid valve 43 and the gas drainage assembly 30, and open the first solenoid valve 42 and the gas compression assembly 20 for the second fracturing. After repeating the sequence of fracturing - gas drainage multiple times, all the fracturing and gas drainage work of this coal seam is completed.

[0060] The integrated device for gas fracturing and gas drainage can prevent gas leakage and fully drain the gas in the coal seam, achieving the purpose of reducing risks, improving the efficiency of gas extraction, and avoiding waste of gas resources.

[0061] In summary, the utility model provides an integrated device for gas fracturing and gas drainage. By setting the switching assembly 40 to switch the gas compression assembly 20 and the gas drainage assembly 30 to work separately, the functions of gas fracturing and gas drainage are integrated. After the gas fracturing of the coal body, there is no need to remove the pipeline, and the gas in the borehole can be immediately drained, realizing the continuous gas fracturing and gas drainage of the coal body, effectively preventing gas from leaking into the roadway, avoiding safety accidents such as gas explosions, and further improving the safety of coal mining and the efficiency of gas drainage. By setting the gas compression assembly 20, gas fracturing technology is used to replace the common hydraulic fracturing technology, which can effectively avoid a series of technical problems brought by hydraulic fracturing technology. Through gas fracturing technology, it can ensure good fracturing effect on the coal seam, efficiently fracture the coal body underground in the coal mine, and minimize pollution, disturbance, and danger, achieving the ideal purpose. The integrated device for gas fracturing and gas drainage proposed by the utility model has a simple structure and low cost, is convenient for moving, installing, and disassembling, has simple operation, does not require too much manpower, and can be recycled, with good economic benefits and is suitable for large - scale popularization and use.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0064] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0065] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.

[0066] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0067] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A gas fracturing and gas extraction integrated device, characterized in that: include: A fracturing and extraction assembly (10) having a vent hole (131) arranged in a coal seam; the fracturing and extraction assembly (10) is in sealing cooperation with the coal seam; A gas compression assembly (20) is connected to the vent hole (131) of the fracturing and extraction assembly (10) through a pipeline, and is used to drive gas with a set pressure from the vent hole (131) into the coal seam to perform gas fracturing; A gas extraction component (30) is connected to the vent hole (131) of the fracturing extraction component (10) through a pipeline, and is used to extract gas between the fracturing extraction component (10) and the coal seam from the vent hole (131) into the gas extraction component (30) to perform gas extraction; The switching assembly (40) is connected to the vent hole (131) of the fracturing and extraction assembly (10), the gas compression assembly (20), and the gas extraction assembly (30) through pipelines, respectively, and is used to switch one of the gas compression assembly (20) and the gas extraction assembly (30) to be connected to the fracturing and extraction assembly (10).

2. The integrated gas fracturing and gas extraction device according to claim 1, characterized in that: The integrated gas fracturing and gas extraction device further comprises a pressure measuring component (50), wherein the pressure measuring component (50) is connected to the air vent (131) of the fracturing and extraction component (10) via a pipeline, and is used to measure the gas pressure between the fracturing and extraction component (10) and the coal seam.

3. The integrated gas fracturing and gas extraction device according to claim 2, characterized in that: The integrated gas fracturing and gas extraction device also includes a control terminal (60), and the control terminal (60) is electrically connected to the pressure measurement component (50), the switching component (40), the gas compression component (20), and the gas extraction component (30), respectively, so as to control the coordinated operation of the gas compression component (20), the gas extraction component (30), and the switching component (40).

4. The integrated gas fracturing and gas extraction device according to claim 2, characterized in that: The pressure measurement component (50) comprises a first three-way valve (51) and a pressure sensor (52); the fracturing and extraction component (10) comprises a main pipeline (70) connected to the vent hole (131); the first three-way valve (51) is arranged on the main pipeline (70), and an inlet and an outlet are respectively connected to the main pipeline (70); the pressure sensor (52) is arranged on a pipeline connected to another outlet of the first three-way valve (51) for detecting pressure.

5. The integrated gas fracturing and gas extraction device according to claim 4, characterized in that: The gas fracturing and gas extraction integrated device further comprises a pressure relief pipe, one end of which is connected to another outlet of the first three-way valve (51), and the other end of which is connected to the outside for exhausting gas and relieving pressure; The integrated gas fracturing and gas extraction device further comprises an on-off valve (80), wherein the on-off valve (80) is arranged on the main pipe (70) and is used to control the opening and closing of the main pipe (70).

6. The integrated gas fracturing and gas extraction device according to claim 1, characterized in that: The switching assembly (40) includes a second three-way valve (41); the fracturing and extraction assembly (10) includes a main pipeline (70) connected to the vent (131), and the first port of the second three-way valve (41) is connected to the main pipeline (70); the gas fracturing and gas extraction integrated device also includes a switchable gas compression pipeline (90) and a switchable gas extraction pipeline (100), one end of the gas compression pipeline (90) is connected to the second port of the second three-way valve (41), and the other end is connected to the gas compression assembly (20); one end of the gas extraction pipeline (100) is connected to the third port of the second three-way valve (41), and the other end is connected to the gas extraction assembly (30).

7. The integrated gas fracturing and gas extraction device according to claim 6, characterized in that: The switching assembly (40) further comprises a first solenoid valve (42) and a second solenoid valve (43); the first solenoid valve (42) is arranged on the gas compression pipeline (90) and is used to control the on-off of the gas compression pipeline (90); the second solenoid valve (43) is arranged on the gas extraction pipeline (100) and is used to control the on-off of the gas extraction pipeline (100); The integrated gas fracturing and gas extraction device further comprises a control terminal (60), and the second three-way valve (41), the first solenoid valve (42) and the second solenoid valve (43) are respectively electrically connected to the control terminal (60).

8. The integrated gas fracturing and gas extraction device according to claim 1, characterized in that: The gas extraction component (30) comprises: a gas storage tank (32) and a gas extraction pump (31); the gas storage tank (32) is used to collect and store gas; the gas extraction pump (31) is connected to the vent holes (131) of the fracturing extraction component (10) and the gas storage tank (32) through pipelines, and is used to extract the gas between the fracturing extraction component (10) and the coal seam from the vent holes (131) into the gas storage tank (32).

9. The integrated gas fracturing and gas extraction device according to claim 1, characterized in that: The gas compression assembly (20) comprises: a gas compression pump (21) and a compressed gas cylinder (22), wherein the compressed gas cylinder (22) is used to store gas for fracturing; the gas compression pump (21) is connected to the air vents (131) of the fracturing and extraction assembly (10) through pipelines, and the compressed gas cylinder (22) is used to drive the gas to enter the coal seam from the air vents (131) according to the set pressure to perform gas fracturing.

10. The integrated gas fracturing and gas extraction device according to claim 1, characterized in that: The fracturing extraction assembly (10) comprises a plurality of packers (11), a seal (12), and a porous pipeline (13) having a plurality of ventilation holes (131); a fracturing hole (110) is formed in the coal seam by drilling, one end of the porous pipeline (13) is connected to the switching assembly (40) through a pipeline, and the other end is located in the fracturing hole (110), and the plurality of ventilation holes (131) are arranged at intervals along the axial direction of the porous pipeline (13) on the other end of the porous pipeline (13). The sealing member (12) is arranged at one end of the porous pipe (13) and is sealed with the orifice of the fracturing hole (110) to seal the fracturing hole (110); a plurality of the packers (11) are arranged at intervals along the axial direction of the porous pipe (13) and are sealed with the inner wall of the fracturing hole (110) to divide the fracturing hole (110) into a plurality of fracturing chambers (111) arranged at intervals, and one of the fracturing chambers (111) is connected to at least one of the vents (131).

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