Coal seam directional fracturing gas extraction equipment

Abstract

The utility model discloses coal seam directional fracturing gas extraction equipment, which relates to the field of coal mine gas anti-reflection extraction and comprises a fracturing extraction pipe, and a fracturing extraction cavity and a sealing element are fixed on the fracturing extraction pipe. When the method is used for fracturing the coal seam, if the coal seam cannot be fractured only by means of the fracturing fluid, the fracturing extraction cavity can control the fracturing fluid to violently impact the hard coal seam to force the coal seam to be fractured, so that the overall fracturing effect of the coal seam is improved, and then efficient extraction of coal seam gas is improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mine gas permeability enhancement and extraction, specifically a coal seam directional fracturing gas extraction device. Background Technology

[0002] Hydraulic fracturing, hydraulic slotting, and hydraulic perforation are important technical means to improve the permeability of coal seams and are currently widely used in the permeability enhancement and drainage process of low-permeability coal seams. Among them, hydraulic fracturing technology has gradually matured after years of development, and its advantages of low cost, good permeability enhancement effect, simple operation, and safety and reliability have made it favored by most coal mining enterprises. High-pressure fracturing fluid is injected into a closed borehole. When the internal pressure exceeds the strength of the coal body, the coal body is damaged and fractured, achieving the effect of increasing coal seam permeability. However, when encountering hard coal seams during the fracturing process, which prevents the fracturing fluid from effectively fracturing the coal seam, the overall fracturing effect of the coal seam will be greatly reduced, thus affecting the efficiency of coal seam gas drainage.

[0003] To address the above problems, this utility model provides a coal seam directional fracturing gas extraction device to solve the aforementioned issues. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a coal seam directional fracturing gas extraction device, comprising:

[0005] Fracturing extraction pipe, installed inside the borehole;

[0006] Multiple fracturing extraction chambers are arranged and evenly fixed on the fracturing extraction pipe; and

[0007] The sealing element is fixed to the top of the fracturing extraction pipe and seals the coal seam borehole.

[0008] Further, preferably, the fracturing extraction chamber includes:

[0009] The shell and fracturing fluid outlet are symmetrically fixed on the fracturing extraction pipe;

[0010] A pressure slide plate is slidably mounted on the bottom of the housing;

[0011] Fixing plate one and fixing plate two are both fixed inside the housing, and fixing plate one has a through hole;

[0012] The hydraulic chamber is composed of the pressure sliding plate and the fixed plate.

[0013] The energy-saving slide plate is slidably disposed inside the housing and forms an adjustment chamber through the fixed plate;

[0014] The linkage plate is slidably disposed within the housing, and multiple compression springs are arranged between the linkage plate and the energy storage slide plate.

[0015] The power storage control mechanism is symmetrically fixed on the housing and can control the sliding of the linkage plate;

[0016] Compression spring two, multiple of them are arranged and fixed between the linkage plate and the fixed plate two;

[0017] Rack one, passing through the fixing plate two, is fixed to the linkage plate; and

[0018] The actuator is fixed inside the housing, passing through the fracturing extraction pipe.

[0019] Furthermore, preferably, the sum of the elastic forces provided by the first compression spring should be much greater than the sum of the elastic forces provided by the second compression spring, but the sum of the elastic forces provided by the second compression spring should be sufficient to allow the linkage plate to slide back to its initial state after movement.

[0020] Further, preferably, the actuator includes:

[0021] The sluice box is fixed inside the shell, passing through the fracturing extraction pipe;

[0022] A gear, rotatably mounted on the housing, meshes with the rack; and

[0023] A sliding column is slidably disposed within the slide chamber and is fixed with a striking hammer and a rack, wherein the rack meshes with the gear.

[0024] Further, preferably, the energy storage control mechanism includes:

[0025] The chamber body is symmetrically fixed to the shell, and an adjustment mechanism is fixed inside the chamber body; and

[0026] The limiting rod is rotatably mounted on the chamber body, with one end in contact with the linkage plate and limiting its movement, and the other end fixed to the adjustment mechanism.

[0027] Further, preferably, the adjustment mechanism includes:

[0028] The connecting rod has one end fixed to the limiting rod and the other end has a slide. A ball is installed in the slide, and a compression spring is installed between the ball and the bottom of the slide.

[0029] The slide rails and limiting slides are all fixed to the compartment body; and

[0030] The limiting arc is fixed on the limiting slide.

[0031] The following steps can be used to implement this patent:

[0032] S1. Pre-treatment of the coal seam by drilling equipment;

[0033] S2. After pretreatment, the fracturing extraction pipe is placed into the borehole, and the borehole is sealed with a sealing device.

[0034] S3. Connect the fracturing fluid delivery equipment to the fracturing extraction pipe;

[0035] S4. Start the fracturing fluid delivery equipment to deliver the fracturing fluid into the fracturing extraction pipe. The fracturing extraction chamber fractures each layer while facilitating gas extraction.

[0036] Compared with the prior art, this utility model provides a coal seam directional fracturing gas extraction device, which has the following beneficial effects:

[0037] In this invention, when encountering a hard coal seam during coal seam fracturing and the fracturing fluid alone is insufficient to effectively fracture the coal seam, the fracturing extraction chamber can compress the compression spring by high-pressure fracturing fluid and control its elastic force through a power storage control mechanism. When the elastic force is fully accumulated, it is suddenly released, which drives the hammer to violently strike the coal seam and cause it to fracture. This allows the fracturing fluid to break through the hard coal seam to ensure the overall fracturing effect of the coal seam. Furthermore, after the drilling fracturing operation is completed, the quality of air fractures in the roadway is improved, thereby improving the efficient extraction of coal seam gas. Attached Figure Description

[0038] Figure 1 A schematic diagram of the overall installation of a coal seam directional fracturing gas extraction device;

[0039] Figure 2 A schematic diagram of the fracturing and extraction chamber structure of a coal seam directional fracturing gas extraction device;

[0040] Figure 3 This is a structural diagram of the actuator of a coal seam directional fracturing gas extraction device;

[0041] Figure 4 A structural diagram of the energy storage control mechanism of a coal seam directional fracturing gas extraction device;

[0042] Figure 5 This is a structural diagram of the regulating mechanism of a coal seam directional fracturing gas extraction device.

[0043] In the diagram: 1. Fracturing extraction pipe; 2. Fracturing extraction chamber; 21. Pressure slide plate; 22. Fixed plate one; 23. Hydraulic chamber; 24. Power storage slide plate; 25. Adjustment chamber; 26. Fracturing fluid outlet; 27. Linkage plate; 28. Compression spring one; 29. ​​Fixed plate two; 211. Rack one; 212. Compression spring two; 213. Housing; 3. Seal; 4. Power storage control mechanism; 41. Chamber body; 42. Limiting rod; 43. Adjustment mechanism; 431. Connecting rod; 432. Compression spring three; 433. Slide rail; 434. Ball bearing; 435. Limiting arc; 437. Limiting slide; 5. Actuator; 51. Slide chamber; 52. Striking hammer; 53. Gear; 54. Sliding column. Detailed Implementation

[0044] Reference Figures 1-5 This utility model provides a technical solution: a coal seam directional fracturing gas extraction device, comprising:

[0045] Fracturing extraction pipe 1 is installed inside the borehole;

[0046] Multiple fracturing extraction chambers 2 are arranged and evenly fixed on the fracturing extraction pipe 1; and

[0047] The sealing element 3 is fixed to the top of the fracturing extraction pipe 1 and seals the coal seam borehole.

[0048] In a preferred embodiment, the fracturing extraction chamber 2 includes:

[0049] The shell 213 and the fracturing fluid outlet 26 are symmetrically fixed on the fracturing extraction pipe 1;

[0050] Pressure slide plate 21 is slidably disposed at the bottom of housing 213;

[0051] Fixing plate 22 and fixing plate 29 are both fixed inside the housing 213, and the fixing plate 22 has through holes.

[0052] The hydraulic chamber 23 is composed of the pressure slide plate 21 and the fixed plate 22;

[0053] The energy storage slide plate 24 is slidably disposed inside the housing 213 and forms an adjustment chamber 25 through the fixing plate 22;

[0054] The linkage plate 27 is slidably disposed within the housing 213, and a plurality of compression springs 28 are arranged between the linkage plate 27 and the energy storage slide plate 24.

[0055] The power storage control mechanism 4 is symmetrically fixed on the housing 213 and can control the sliding of the linkage plate 27;

[0056] Compression spring 212, multiple of them are arranged and fixed between the linkage plate 27 and the fixing plate 29;

[0057] Rack 211, passing through the fixing plate 29, is fixed to the linkage plate 27; and

[0058] The actuator 5 is fixed inside the housing 213 through the fracturing extraction pipe 1.

[0059] In a preferred embodiment, the sum of the elastic forces provided by the first compression spring 28 should be much greater than the sum of the elastic forces provided by the second compression spring 212, but the sum of the elastic forces provided by the second compression spring 212 should be sufficient to allow the linkage plate 27 to slide back to its initial state after movement.

[0060] It should be noted that during the process of high-pressure fracturing fluid fracturing the coal seam, if the fracturing fluid encounters a relatively hard coal seam and cannot cause fracturing, the fracturing fluid will stop flowing out of the fracturing fluid outlet 26. This causes the fracturing fluid to squeeze the pressure slide plate 21 and slide it upwards within the hydraulic chamber 23. The sliding of the pressure slide plate 21 will cause the hydraulic oil in the hydraulic chamber 23 to flow through the through hole into the regulating chamber 25, thereby causing the energy storage slide plate 24 to slide upwards and compress and store energy in the compression spring 28. At the same time, because the energy storage control mechanism 4 limits the position of the linkage plate 27, it prevents the linkage plate from sliding if the sliding condition of the linkage plate 27 is not met. 27 Slippage occurs; when the compression spring 28 reaches its compression limit, that is, when the sliding condition of the linkage plate 27 is met, the power storage control mechanism 4 will release the restriction on the linkage plate 27. At this time, under the action of the compression spring 28, the linkage plate 27 will slide upward rapidly. The rapid sliding of the linkage plate 27 will cause the rack 211 to slide, thereby causing the actuator 5 to violently strike the hard coal seam, further causing the coal seam to fracture. This allows the fracturing fluid to break through the hard coal seam and ensure the overall fracturing effect of the coal seam. In turn, after the drilling fracturing operation is completed, the quality of the air fracture in the roadway is improved, thereby improving the efficient extraction of coal seam gas.

[0061] It needs to be explained that as the linkage plate 27 slides, the compression spring 212 is compressed. After the actuator 5 completes the hammering and fracturing of the hard coal seam, the fracturing fluid continues to flow into the coal seam to further fracture it. This causes the oil pressure of the fracturing fluid in the fracturing extraction chamber 2 to decrease. Under the action of the compression spring 212, the linkage plate 27 will return to its initial state, that is, the fracturing extraction chamber 2 will return to its initial state. This makes it convenient to hammer the coal seam again to fracture it if the situation of being unable to fracture occurs again.

[0062] In a preferred embodiment, the actuator 5 includes:

[0063] The slide 51 is fixed inside the shell 213 through the fracturing extraction pipe 1;

[0064] Gear 53, rotatably mounted on housing 213, and meshing with rack 211; and

[0065] The sliding column 54 is slidably disposed in the slide chamber 51 and is fixed with the hammer 52 and the rack 2, which meshes with the gear 53.

[0066] It should be noted that when the rack 211 slides rapidly, it will cause the gear 53 to rotate. The rotation of the gear 53 will cause the slide column 54 to slide rapidly from inside the slide chamber 51 to outside the housing 213, causing the hammer 52 to strike the hard coal seam violently, thereby causing the hard coal seam to fracture and ensuring the overall fracturing effect of the coal seam.

[0067] In a preferred embodiment, the control mechanism 4 includes:

[0068] The chamber 41 is symmetrically fixed to the housing 213, and an adjustment mechanism 43 is fixed inside the chamber 41; and

[0069] The limiting rod 42 is rotatably mounted on the chamber 41, with one end in contact with the linkage plate 27 and limiting its movement, and the other end fixed to the adjustment mechanism 43.

[0070] In a preferred embodiment, the adjustment mechanism 43 includes:

[0071] The connecting rod 431 has one end fixed to the limiting rod 42 and the other end has a slide. A ball bearing 434 is provided in the slide, and a compression spring 432 is provided between the ball bearing and the bottom of the slide.

[0072] The slide rail 433 and the limiting slide rail 437 are both fixed on the chamber body 41; and

[0073] The limiting arc 435 is fixed on the limiting slide 437.

[0074] It should be noted that when the conditions for sliding of the linkage plate 27 are not met, i.e., when the compression spring 28 has not reached its compression limit, the ball 434 cannot slide within the slide rail by compressing the spring 432 through the limiting arc 435. This prevents the linkage plate 27 from sliding, allowing the compression spring 28 to obtain sufficient elastic force to drive the hammer 52 to strike the coal seam. When the compression spring 28 reaches its compression limit, the ball 434 slides within the slide rail through the limiting arc 435, compressing the spring 432. This allows the ball 434 to escape the limitation of the limiting arc 435 and slide within the limiting slide rail 437. In other words, the limiting rod 42 rotates under the action of the linkage plate 27, thus losing its limitation on the linkage plate 27. The linkage plate 27 then slides rapidly under the elastic force of the compression spring 28, thereby driving the hammer 52 to strike the coal seam and ensuring the overall fracturing effect of the coal seam.

[0075] It should be noted that after the coal seam is struck, the linkage plate 27 and the striking hammer 52 will return to their initial state under the action of the compression spring 212, that is, the fracturing extraction chamber 2 will return to its initial state.

[0076] The following steps can be taken during implementation:

[0077] S1. Pre-treatment of the coal seam by drilling equipment;

[0078] S2. After the pretreatment is completed, the fracturing extraction pipe 1 is placed into the borehole, and the borehole is sealed by the sealing element 3.

[0079] S3. Connect the fracturing fluid delivery equipment to the fracturing extraction pipe 1;

[0080] S4. Start the fracturing fluid delivery equipment to deliver the fracturing fluid to the fracturing extraction pipe 1. The fracturing extraction chamber 2 performs fracturing on each layer and facilitates gas extraction.

[0081] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A coal seam directional fracturing gas extraction device, characterized in that: include: Fracturing extraction pipe (1) is installed inside the borehole; Multiple fracturing extraction chambers (2) are arranged and evenly fixed on the fracturing extraction pipe (1); as well as The sealing element (3) is fixed to the top of the fracturing extraction pipe (1) and seals the coal seam borehole; The shell (213) and the fracturing fluid outlet (26) are symmetrically fixed on the fracturing extraction pipe (1); A pressure plate (21) is slidably disposed at the bottom of the housing (213); Fixing plate one (22) and fixing plate two (29) are both fixed inside the housing (213), and a through hole is provided on fixing plate one (22); The hydraulic chamber (23) is composed of the pressure slide plate (21) and the fixed plate (22); The power storage slide plate (24) is slidably disposed inside the housing (213) and forms an adjustment chamber (25) through the fixing plate (22). The linkage plate (27) is slidably disposed inside the housing (213), and a plurality of compression springs (28) are arranged between the linkage plate (27) and the energy storage slide plate (24). The power storage control mechanism (4) is symmetrically fixed on the housing (213) and can control the sliding of the linkage plate (27); Compression springs two (212) are arranged in multiples and fixed between the linkage plate (27) and the fixed plate two (29); Rack 1 (211) passes through the fixing plate 2 (29) and is fixed on the linkage plate (27); and The actuator (5) is fixed inside the housing (213) through the fracturing extraction pipe (1).

2. The coal seam directional fracturing gas extraction equipment according to claim 1, characterized in that: The sum of the elastic forces provided by the first compression spring (28) should be much greater than the sum of the elastic forces of the second compression spring (212), but the sum of the elastic forces provided by the second compression spring (212) should be sufficient to allow the linkage plate (27) to slide back to its initial state after movement.

3. The coal seam directional fracturing gas extraction equipment according to claim 2, characterized in that: The actuator (5) includes: The slide (51) is fixed inside the shell (213) through the fracturing extraction pipe (1); A gear (53) is rotatably mounted on the housing (213) and meshes with the rack (211); and A sliding column (54) is slidably disposed in the slide chamber (51) and is fixed with a hammer (52) and a rack, the rack meshing with the gear (53).

4. A coal seam directional fracturing gas extraction device according to claim 3, characterized in that... The energy storage control mechanism (4) includes: The chamber (41) is symmetrically fixed to the shell (213), and an adjustment mechanism (43) is fixed inside the chamber (41); and The limiting rod (42) is rotatably mounted on the chamber (41), with one end in contact with the linkage plate (27) and limiting its movement, and the other end fixed to the adjustment mechanism (43).

5. A coal seam directional fracturing gas extraction device according to claim 4, characterized in that... The adjustment mechanism (43) includes: The connecting rod (431) has one end fixed to the limiting rod (42) and the other end has a slide. A ball (434) is provided in the slide, and a compression spring (432) is provided between the ball and the bottom of the slide. The slide rail (433) and the limiting slide rail (437) are both fixed on the chamber body (41); and The limiting arc (435) is fixed on the limiting slide (437).

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