A water jet device for coal seam cavity making and permeability increasing

Abstract

The utility model relates to coal bed gas control equipment technical field especially relates to a water jet device for coal seam cavity making and permeability increasing. The utility model provides a water jet device for coal seam cavity making and permeability increasing can position dilator in the specified position, opens the nozzle and carries out cavity making and permeability increasing simultaneously. A water jet device for coal seam cavity making and permeability increasing, including dilator and slot frame etc. The upper portion of dilator is connected with slot frame. The utility model discloses through starting bidirectional cylinder, pushes the fixed link to the borehole inner wall, stabilizes the connecting cone column in the position, then continues to push dilator, makes the connecting plate move close to connecting cone column, when baffle frame moves along the L type groove on the slot frame linearly, drives dilator to rotate through the drilling machine again, drives the slot frame to rotate, makes baffle frame no longer block the nozzle, and water sprays from the nozzle on dilator, reaches can position dilator in the specified position, opens the nozzle and carries out cavity making and permeabilty increasing simultaneously effect.

Description

Technical Field

[0001] This utility model relates to the technical field of coal seam gas control equipment, and in particular to a water jet device for creating cavities and increasing permeability in coal seams. Background Technology

[0002] In the process of coal mining, coal seam gas outburst is one of the major safety hazards. In order to improve the permeability of coal seams and enhance the gas extraction effect, water jet cavity creation technology is usually used. High-pressure water jets break the coal body to form cavities, build a fracture network, and reduce the resistance to gas migration.

[0003] Existing water jet devices for coal seam cavity creation and permeability enhancement typically involve using a drilling rig to advance an expander to a designated position in the borehole for cavity creation. However, because the expander relies solely on the drilling rig for support, it is difficult to stably remain at the preset cavity creation position in the coal seam. During operation, factors such as drilling rig vibration and changes in coal seam stress can easily cause cavity displacement, resulting in uneven permeability enhancement. Furthermore, since the nozzle is always open, coal slag and impurities from the borehole can easily enter the nozzle, causing blockage and affecting the normal progress of subsequent cavity creation operations.

[0004] Therefore, a water jet device for creating cavitation and enhancing permeability in coal seams has now been developed, which can position the expander at a designated location and simultaneously open the nozzle to create cavitation and enhance permeability. Utility Model Content

[0005] To overcome the shortcomings of existing water jet devices for coal seam cavity creation and permeability enhancement, where the expander relies solely on the drilling rig for support, making it difficult to stably remain at the preset cavity creation position, and the nozzle is always open, allowing coal slag and impurities from the borehole to easily enter the nozzle and cause blockage, this invention provides a water jet device for coal seam cavity creation and permeability enhancement that can position the expander at a designated location while simultaneously opening the nozzle for cavity creation and permeability enhancement.

[0006] The technical implementation scheme of this utility model is as follows: a water jet device for creating holes and increasing permeability in coal seams, including an expander, a slot frame, a fixed column, a triggering component and a detection component. The upper part of the expander is connected to the slot frame, and the slot frame has an L-shaped slot. The upper side of the expander is connected to the fixed column. The expander is equipped with a triggering component that can trigger the water jetting operation to increase permeability. The fixed column is equipped with a detection component for detecting the condition of the borehole inner wall.

[0007] In a preferred embodiment of this utility model, multiple nozzles are provided on both the left and right sides of the expander.

[0008] In a preferred embodiment of this utility model, the fixing column is provided with a threaded joint.

[0009] In a preferred embodiment of this utility model, the triggering component includes a connecting plate, a connecting cone, a bidirectional cylinder, a fixed rod, a guide post, a spring, and a baffle frame. The connecting plate is connected to the lower side of the expander, the guide post is connected to the lower side of the connecting plate, the connecting cone is slidably connected to the lower side of the guide post, the bidirectional cylinder is connected to the lower side of the connecting cone, and a fixed rod is connected to the telescopic end of the bidirectional cylinder. A spring is connected between the connecting cone and the connecting plate, and a baffle frame is rotatably connected to the connecting cone. The baffle frame slides with the slot frame through an L-shaped groove.

[0010] In a preferred embodiment of the present invention, the detection component includes a cover frame and a visual detector. The cover frame is slidably connected to the lower part of the fixed column and is located on the upper side of the baffle frame. Multiple visual detectors are connected to the lower part of the fixed column and are located inside the cover frame.

[0011] In a preferred embodiment of this invention, the bidirectional cylinder, the vision detector, and the processor are electrically connected via a control module.

[0012] Compared with the prior art, the present invention has the following advantages: 1. The present invention uses a two-way cylinder to push the fixing rod against the inner wall of the borehole, stabilizing the connecting cone column in that position. Then, the expander is pushed forward, causing the connecting plate to move closer to the connecting cone column. At this time, the baffle frame moves in a straight line along the L-shaped groove on the slot frame. Then, the expander is driven to rotate by the drilling machine, which drives the slot frame to rotate, so that the baffle frame no longer blocks the nozzle. Water is sprayed out from the nozzle on the expander, achieving the effect of positioning the expander in a designated position and opening the nozzle to create a cavity and increase permeability.

[0013] 2. When the baffle frame of this utility model moves linearly along the L-shaped groove on the slot frame, it pushes the cover frame to move away from the visual detector, so that the visual detector can detect the condition of the inner wall of the borehole, so as to adjust the water jet intensity. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of this utility model.

[0016] Figure 3 This is a partial three-dimensional sectional view of the present invention.

[0017] The components in the attached diagram are labeled as follows: 1. Expander, 10. Slot frame, 11. Fixing column, 2. Connecting plate, 3. Connecting cone column, 30. Two-way cylinder, 31. Fixing rod, 4. Guide column, 5. Spring, 6. Baffle frame, 7. Cover frame, 8. Vision detector. Detailed Implementation

[0018] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0019] A water jet device for creating cavitation and enhancing permeability in coal seams, such as Figures 1-3 As shown, it includes an expander 1, a slot frame 10, a fixing column 11, a triggering component, and a detection component. The expander 1 is connected to the upper part of the slot frame 10. Multiple nozzles are provided on both the left and right sides of the expander 1 for easy water spraying. The slot frame 10 has an L-shaped slot. The expander 1 is connected to the upper side of the fixing column 11. The fixing column 11 is provided with a threaded joint for easy docking with the drilling rig. The expander 1 is provided with a triggering component, and the fixing column 11 is provided with a detection component.

[0020] like Figures 1-3 As shown, the triggering assembly includes a connecting plate 2, a connecting cone 3, a two-way cylinder 30, a fixing rod 31, a guide post 4, a spring 5, and a baffle frame 6. The connecting plate 2 is connected to the lower side of the expander 1, the guide post 4 is connected to the lower side of the connecting plate 2, the connecting cone 3 is slidably connected to the lower side of the guide post 4, the two-way cylinder 30 is connected to the lower side of the connecting cone 3, and the fixing rod 31 is connected to the telescopic end of the two-way cylinder 30. The spring 5 is connected between the connecting cone 3 and the connecting plate 2, and the baffle frame 6 is rotatably connected to the connecting cone 3. The baffle frame 6 slides with the slot frame 10 through an L-shaped groove.

[0021] like Figures 1-3 As shown, the detection assembly includes a cover frame 7 and a vision detector 8. The cover frame 7 is slidably connected to the lower part of the fixed column 11. The cover frame 7 is located on the upper side of the baffle frame 6. Multiple vision detectors 8 are connected to the lower part of the fixed column 11. The bidirectional cylinder 30, the vision detectors 8 and the processor are electrically connected through the control module. The vision detectors 8 are located inside the cover frame 7.

[0022] When using this utility model, first install the fixing column 11 on the drilling machine through the threaded joint. After installation, start the drilling machine and push the expander 1 into the coal seam borehole. When the expander 1 reaches the designated cavity-making position, start the bidirectional cylinder 30 to push the fixing rod 31 against the inner wall of the borehole, stabilize the connecting cone column 3 and the expander 1 in this position, and ensure the stability of the expander 1.

[0023] Then, the expander 1 is continued to be advanced, causing the connecting plate 2 to move the guide column 4 closer to the connecting cone column 3. The spring 5 is compressed and contracted. At this time, the baffle frame 6 moves linearly along the L-shaped groove on the slot frame 10. Then, the drill drives the expander 1 to rotate, which in turn drives the slot frame 10 to rotate, causing the baffle frame 6 to move laterally along the L-shaped groove on the slot frame 10. This causes the baffle frame 6 to be misaligned with the nozzle on the expander 1, so that water is sprayed out from the nozzle on the expander 1. As the expander 1 rotates, it acts evenly on the coal body around the borehole, forming a regular cavity with a circular cross-section. This allows the expander 1 to be positioned in a designated location, while the nozzle is opened to create a cavity and increase permeability.

[0024] After the hole is enlarged, the expander 1 and the slot frame 10 are rotated in opposite directions, the baffle frame 6 slides along the L-shaped slot, and then the fixing rod 31 is moved away from the inner wall of the borehole. The spring 5 rebounds, causing the connecting cone column 3 to move downward, which drives the baffle frame 6 to reset and block the nozzle.

[0025] When the baffle frame 6 moves in a straight line along the L-shaped groove on the slot frame 10, it pushes the cover frame 7 to move away from the vision detector 8, so that the vision detector 8 can detect the condition of the borehole inner wall in order to adjust the water jet intensity.

[0026] Although this disclosure has been described with respect to only a limited number of embodiments, those skilled in the art who benefit from this disclosure will understand that various other embodiments can be devised without departing from the scope of this invention. Therefore, the scope of this invention should be limited only by the appended claims.

Claims

1. A water jet device for creating cavitation and enhancing permeability in coal seams, characterized in that, It includes an expander (1), a slot frame (10), a fixing column (11), a triggering component and a detection component. The expander (1) is connected to the upper part of the slot frame (10), which has an L-shaped slot. The expander (1) is connected to the upper side of the fixing column (11). The expander (1) is equipped with a triggering component that can trigger the water spraying penetration enhancement operation. The fixing column (11) is equipped with a detection component for detecting the condition of the borehole inner wall.

2. A water jetting device for creating voids and increasing permeability in coal seams according to claim 1, characterized in that, The expander (1) has multiple nozzles on both the left and right sides.

3. A water jetting device for creating voids and increasing permeability in coal seams according to claim 1, characterized in that, The fixed column (11) is equipped with a threaded joint.

4. A water jetting device for creating cavitation and enhancing permeability in coal seams according to claim 1, characterized in that, The triggering assembly includes a connecting plate (2), a connecting cone (3), a two-way cylinder (30), a fixing rod (31), a guide post (4), a spring (5), and a baffle frame (6). The expansion device (1) is connected to the lower side of the connecting plate (2), the connecting plate (2) is connected to the lower side of the guide post (4), the connecting cone (3) is slidably connected to the lower side of the guide post (4), the two-way cylinder (30) is connected to the lower side of the connecting cone (3), the two-way cylinder (30) is connected to the telescopic end of the two-way cylinder (30), the connecting cone (3) is connected to the connecting plate (2) with a spring (5), the connecting cone (3) is rotatably connected to the connecting cone (3), and the baffle frame (6) is slidably connected to the connecting cone (3) through an L-shaped groove and the groove frame (10).

5. A water jetting device for creating voids and increasing permeability in coal seams according to claim 4, characterized in that, The detection assembly includes a cover frame (7) and a vision detector (8). The cover frame (7) is slidably connected to the lower part of the fixed column (11). The cover frame (7) is located on the upper side of the baffle frame (6). Multiple vision detectors (8) are connected to the lower part of the fixed column (11). The vision detectors (8) are located inside the cover frame (7).

6. A water jetting device for creating cavitation and enhancing permeability in coal seams according to claim 5, characterized in that, The two-way cylinder (30), vision detector (8) and processor are electrically connected via a control module.

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