Coal seam multi-section type directional fracturing and permeation increasing equipment and method

Abstract

The invention provides coal seam multi-section type directional fracturing and permeation increasing equipment and method, and relates to the technical field of coal mine gas treatment and coal seam gas exploitation, the coal seam multi-section type directional fracturing and permeation increasing equipment comprises a machine body, a propelling mechanism, a fracturing pipe and a liquid inlet mechanism, and a plurality of sets of directional assemblies are arranged outside the fracturing pipe at equal intervals; and the fixing mechanism is used for directionally spraying the high-pressure water to the fixed direction in the coal seam and comprises a limiting component arranged on the propelling mechanism and used for limiting the fracturing pipe stretching into the fracturing seam and a connecting component arranged on the limiting component and used for locking the fracturing pipe. High-pressure water can be directionally jetted to the fixed direction in a coal seam fracturing hole, the situation that due to the fact that the high-pressure water is jetted at will, a large number of cracks are generated on the soft portion of the coal seam, and consequently permeation increasing is uneven is avoided, in addition, a fracturing pipe stretching into the fracturing hole can be fixed, and the situation that the permeation increasing effect is affected due to the fact that the fracturing pipe shakes when equipment runs is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine gas control and coal bed gas exploitation, in particular to a coal bed multi-section directional fracturing and permeability enhancement equipment and method. BACKGROUND

[0002] Coal seams in China generally have low permeability, high gas pressure and strong adsorption, which makes it extremely difficult to pre-drain coal seam gas (coal bed gas). Efficient extraction of coal seam gas is a fundamental measure to prevent coal and gas outburst, gas explosion and other major accidents in coal mines, and is also a key link to realize the resource utilization of coal bed gas, a clean energy source. However, low permeability results in large gas flow resistance and small extraction radius, often requiring a long pre-drainage time to reach safety standards, which seriously restricts the safe and efficient production of coal mines and the commercial development of coal bed gas industry. In order to improve the permeability of coal seams, the industry widely uses water fracturing, water cutting and other permeability enhancement technologies.

[0003] Conventional fracturing pressurizes the entire borehole by pressurizing the borehole as a whole, and the entire borehole section is fractured without distinction. If the coal seam texture is uneven, the pressure will act on the softer coal layer first, resulting in ineffective treatment of hard coal layers, resource waste and uneven effects. In addition, the equipment will vibrate during operation, and the high-pressure water jetted into the coal seam will also cause the fracturing pipe used for water jetting to shake due to the reaction force, thus affecting the fracturing effect. SUMMARY

[0004] The purpose of the present application is to solve the problem that the existing coal seam multi-section directional fracturing and permeability enhancement equipment cannot direct the high-pressure water to achieve directional fracturing of the coal seam, and the fracturing pipe used for water jetting is prone to vibration during operation, affecting the fracturing effect.

[0005] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions: The coal seam multi-section directional fracturing and permeability enhancement equipment comprises a machine body, a propulsion mechanism arranged on the top of the machine body, a fracturing pipe arranged on the propulsion mechanism, and a liquid inlet mechanism arranged between the machine body and the fracturing pipe, and further comprises: A directional assembly is arranged in several groups, and the several directional assemblies are arranged equidistantly outside the fracturing pipe, for directing the high-pressure water to be jetted to a fixed direction inside the coal seam; A fixing mechanism comprises a limiting component arranged on the propulsion mechanism for limiting the fracturing pipe inserted into the fracturing seam, and a connecting component arranged on the limiting component for locking the fracturing pipe.

[0006] As the preferred technical scheme of the present application, the directional assembly comprises rotating grooves opened on the outside of the fracturing pipe, a rotating sleeve rotatingly arranged in the rotating grooves, a spray head arranged outside the rotating sleeve, and a bolt threadedly arranged outside the rotating sleeve, and the surface of the rotating groove is provided with a plurality of water outlet holes communicating with the inner cavity of the fracturing pipe.

[0007] As the preferred technical scheme of the present application, the limiting component comprises a cylinder connected with the propelling mechanism, a piston rod arranged at the output end of the cylinder, a fixed seat arranged at the end of the piston rod, a plurality of first movable columns movably arranged at the side wall of the fixed seat, a plurality of second movable columns movably arranged at the side wall of the cylinder, and an extrusion plate movably arranged between the first movable columns and the second movable columns.

[0008] As the preferred technical scheme of the present application, the connecting component comprises a threaded cylinder arranged at the end of the fixed seat, a threaded column arranged at the end of the fracturing pipe and matched with the threaded cylinder, a threaded sleeve slidingly arranged outside the threaded cylinder, and a threaded head arranged outside the threaded column and matched with the threaded sleeve, and the screw grooves matched with the threaded cylinder and the threaded column have opposite screw groove rotation directions compared with the screw grooves matched with the threaded sleeve and the threaded head.

[0009] As the preferred technical scheme of the present application, the threaded cylinder is fixedly connected with a limiting ring for blocking the threaded sleeve at the edge of one end of the threaded cylinder facing the threaded column.

[0010] As the preferred technical scheme of the present application, the inner wall of the threaded sleeve in contact with the threaded cylinder is provided with a rubber ring.

[0011] As the preferred technical scheme of the present application, the propelling mechanism and the fracturing pipe are further provided with an adjusting assembly, and the adjusting assembly comprises a mounting plate arranged at the output end of the propelling mechanism, an adjusting sleeve arranged on the mounting plate, a rolling ball rotatingly arranged in the adjusting sleeve, a connecting column arranged at the end of the rolling ball located outside the adjusting sleeve, and a locking component arranged in the adjusting sleeve.

[0012] As the preferred technical scheme of the present application, the locking component comprises a threaded rod threadedly arranged at the side wall of the adjusting sleeve, and a friction pad arranged at the threaded rod and slidingly connected with the inner wall of the adjusting sleeve.

[0013] As the preferred technical scheme of the present application, the liquid inlet mechanism comprises a water tank arranged in the body, a pump body arranged in the water tank, and a water pipe arranged at the output end of the pump body and connected with the inner cavity of the fracturing pipe through the water tank.

[0014] The present application also discloses a use method of the coal seam multi-section directional fracturing and permeation increasing equipment, comprising the following steps: S10: before using the device, the fracturing pipe is installed on the machine body through the connecting part, so that the fracturing pipe does not shake in the clockwise direction or the counterclockwise direction and does not fall off the machine body during subsequent use; S20: after the fracturing pipe is installed, the fracturing pipe is inserted into the pre-formed fracturing hole through the advancing mechanism, water is pumped out through the liquid inlet mechanism and sprayed into the coal seam through the fracturing pipe, and the direction of high-pressure water spraying can be adjusted through the directional assembly, so that the fracturing of each position in the coal seam is carried out in turn; S30: after the fracturing pipe is inserted into the fracturing hole, the fracturing pipe will shake due to the vibration of the machine body during use, and the fracturing pipe will also shake due to the reaction force of high-pressure water. At this time, the fracturing pipe can be fixed in the fracturing hole through the limiting part, so that the fracturing pipe cannot shake when vibrating; S40: the angle of the fracturing pipe can be adjusted through the adjusting assembly, so that the fracturing pipe can be inserted into different angle fracturing holes formed in the coal seam in turn through the advancing mechanism, and multi-stage fracturing and permeability increase can be realized.

[0015] Compared with the prior art, the beneficial effects of the present application are: 1. The fracturing pipe is inserted into the fracturing hole formed in the coal seam through the advancing mechanism, and high-pressure water is sprayed into the fracturing hole through the liquid inlet assembly to form a fracturing crack. At the same time, the directional assembly can spray high-pressure water to the specified position in the coal seam, so that the high-pressure water is sprayed randomly in the prior art, the pressure is preferentially applied to the soft coal layer, the hard coal layer cannot be effectively treated, and resource waste and uneven effect are formed.

[0016] 2. The connecting part can stably install the fracturing pipe and the machine body, and the limiting part can fix the fracturing pipe in the fracturing hole. When the device is working, vibration occurs, and the reaction force of high-pressure water also causes the fracturing pipe to vibrate. At this time, the cooperation of the connecting part and the limiting part can prevent the fracturing pipe from shaking, so that the permeability increase work can be stably carried out.

[0017] 3. The adjusting assembly can adjust the angle of the fracturing pipe according to the need, so that the fracturing pipe can be inserted into different angle fracturing holes formed in the coal seam in turn through the advancing mechanism, and multi-stage fracturing and permeability increase can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall structure diagram of the present application; Figure 2 is another perspective view of the present application; Figure 3 is the front view of the present application; Figure 4 is a directional assembly structure of the present application; Figure 5 is a limiting component structure of the present application; Figure 6 is a connecting component structure of the present application; Figure 7 is a connecting component structure of the present application; Figure 8 is an adjusting component structure of the present application; Figure 9 is a Figure 1 enlarged structure diagram at A in the figure; Figure 10 is a Figure 2 enlarged structure diagram at B in the figure.

[0019] indicated in the figure: 1, body; 2, fracturing pipe; 201, rotating groove; 202, water outlet hole; 3, directional assembly; 301, rotating sleeve; 302, injection head; 303, bolt; 4, limiting component; 401, air cylinder; 402, piston rod; 403, fixed seat; 404, first movable column; 405, second movable column; 406, extrusion plate; 5, adjusting assembly; 501, mounting plate; 502, adjusting sleeve; 503, rolling ball; 504, connecting column; 505, threaded rod; 506, friction pad; 6, connecting component; 601, threaded cylinder; 602, threaded column; 603, threaded head; 604, threaded sleeve; 7, limiting ring; 8, rubber ring; 9, water tank; 10, water pipe. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application.

[0021] As Figures 1 to 6 shown, the present embodiment proposes a coal seam multi-section directional fracturing and permeability enhancement equipment, which comprises a body 1, a propelling mechanism arranged on the top of the body 1, a fracturing pipe 2 arranged on the propelling mechanism, a liquid inlet mechanism arranged between the body 1 and the fracturing pipe 2, a directional assembly 3 and a fixing mechanism, the directional assembly 3 is arranged in several groups, and the several directional assemblies 3 are equidistantly arranged outside the fracturing pipe 2, for directing high-pressure water to be sprayed to a fixed direction inside the coal seam, the fixing mechanism comprises a limiting component 4 arranged on the propelling mechanism for limiting the fracturing pipe 2 inserted into the fracturing crack, and a connecting component 6 arranged on the limiting component 4 for locking the fracturing pipe 2; Firstly, drill a number of fracturing holes on the coal seam through the drilling equipment, then install the fracturing tube 2 on the machine body 1 through the connecting part 6, then extend the fracturing tube 2 into the fracturing hole through the setting propulsion mechanism, then spray high-pressure water into the fracturing hole through the setting liquid inlet assembly, and the high-pressure water can be sprayed towards the fixed direction through the setting directional assembly 3, so as to avoid the random spraying of the high-pressure water, which makes the pressure act on the softer coal layer preferentially, so that the hard coal layer cannot be effectively treated. In addition, after the fracturing tube 2 is extended into the fracturing hole, the fracturing tube 2 can be stably fixed through the setting limiting part 4, so that when the vibration force of the equipment work and the reaction force of the high-pressure water all act on the fracturing tube 2, the fracturing tube 2 will not shake, so that the seepage increasing work can be stably carried out.

[0022] The liquid inlet mechanism includes the water tank 9 arranged inside the machine body 1, the pump body arranged inside the water tank 9, and the water pipe 10 arranged at the output end of the pump body and connected with the inner cavity of the fracturing tube 2 through the water tank 9. After the fracturing tube 2 is extended into the fracturing hole, the pump body in the water tank 9 is started to work, water is pumped out and enters the fracturing tube 2 through the water pipe 10, and finally is sprayed into the coal seam from the water outlet hole 202 on the fracturing tube 2.

[0023] As shown in Figure 1 , Figure 4 and Figure 9 , as a preferred embodiment, on the basis of the above-mentioned mode, further, the directional assembly 3 includes a plurality of rotating grooves 201 arranged on the outside of the fracturing tube 2, a rotating sleeve 301 rotatably arranged in the rotating groove 201, a spray head 302 arranged on the outside of the rotating sleeve 301, and a bolt 303 threadedly arranged on the outside of the rotating sleeve 301, and a plurality of water outlet holes 202 are arranged on the surface of the rotating groove 201 and communicated with the inner cavity of the fracturing tube 2. Before the fracturing tube 2 is extended into the fracturing hole, the rotating sleeve 301 on the outside of the fracturing tube 2 can be rotated according to the need, the position of the spray head 302 is adjusted, then the bolt 303 is rotated and abuts against the inner wall of the rotating groove 201, so that the spray head 302 with the adjusted direction is fixed. At this time, the fracturing tube 2 is extended into the fracturing hole, and the high-pressure water is introduced into the fracturing tube 2. The high-pressure water is sprayed towards the coal seam in the fixed direction through the spray head 302 with the fixed angle, so as to prevent the random spraying of the high-pressure water, and a large number of cracks are formed in the relatively weak part of the coal seam.

[0024] As shown in Figure 1 and Figure 5As shown in the preferred embodiment, the limiting component 4 further comprises a cylinder 401 connected to the advancing mechanism, a piston rod 402 arranged at the output end of the cylinder 401, a fixed seat 403 arranged at the end of the piston rod 402, a plurality of first movable columns 404 movably arranged at the side wall of the fixed seat 403, a plurality of second movable columns 405 movably arranged at the side wall of the cylinder 401, and a pressing plate 406 movably arranged between the first movable columns 404 and the second movable columns 405. When the fracturing tube 2 is inserted into the fracturing hole, the cylinder 401 is started to work, and the fixed seat 403 is horizontally moved by the piston rod 402, at this time, the first movable columns 404 on the fixed seat 403 will be flipped outward, and the second movable columns 405 can drive the pressing plate 406 to move outward, and then tightly abut against the inner wall of the fracturing hole, so that the fracturing tube 2 is stably locked in the fracturing hole, and when the equipment vibrates, the fracturing tube 2 will not shake, thereby improving the stability of the fracturing tube 2.

[0025] As shown in the preferred embodiment, the connecting component 6 further comprises a threaded cylinder 601 arranged at the end of the fixed seat 403, a threaded column 602 arranged at the end of the fracturing tube 2 and matched with the threaded cylinder 601, a threaded sleeve 604 slidably arranged outside the threaded cylinder 601, and a threaded head 603 arranged outside the threaded column 602 and matched with the threaded sleeve 604, the rotation direction of the threaded groove matched with the threaded cylinder 601 and the threaded column 602 is opposite to the rotation direction of the threaded groove matched with the threaded sleeve 604 and the threaded head 603. Figure 2 Figure 6 Figure 7 Figure 10 Before using the equipment, the threaded column 602 at the end of the fracturing tube 2 is screwed into the threaded cylinder 601 at the end of the fixed seat 403 in the forward direction, and then the threaded sleeve 604 outside the threaded cylinder 601 is screwed to the outside of the threaded head 603 in the reverse direction, so that the fracturing tube 2 is installed on the body 1, and thus when the equipment works for a long time and drives the fracturing tube 2 to vibrate, or the high-pressure water sprayed reacts on the fracturing tube 2, no matter which direction the fracturing tube 2 rotates, the connection between the fracturing tube 2 and the body 1 will become tighter and tighter, and compared with the prior art in which the fracturing tube 2 is only connected in a single direction, the fracturing tube 2 of the present application is more stably installed.

[0026] ​​​​In addition, the threaded barrel 601 is fixedly connected with a limiting ring 7 at one end edge of the threaded barrel 601 for blocking the threaded sleeve 604, and the inner wall of the threaded sleeve 604 in contact with the threaded barrel 601 is provided with a rubber ring 8; when the threaded sleeve 604 is screwed onto the threaded head 603, the threaded sleeve 604 will move to the end edge of the threaded barrel 601, at which time the threaded sleeve 604 can be blocked by the limiting ring 7 to prevent the threaded sleeve 604 from falling off the threaded barrel 601, and in addition, the rubber ring 8 provided can increase the friction between the threaded sleeve 604 and the threaded barrel 601; when the cracking pipe 2 and the machine body 1 are disassembled, after the threaded sleeve 604 is rotated to disengage from the threaded head 603, the threaded sleeve 604 will be suspended on the threaded barrel 601 by the rubber ring 8, thereby preventing the threaded sleeve 604 from sliding randomly on the threaded barrel 601.

[0027] As Figure 1 and Figure 8 shown, as a preferred embodiment, on the basis of the above-mentioned mode, further, the advancing mechanism and the cracking pipe 2 are further provided with an adjusting assembly 5, the adjusting assembly 5 comprising a mounting plate 501 provided at the output end of the advancing mechanism, an adjusting sleeve 502 provided on the mounting plate 501, a rolling ball 503 rotatably provided in the adjusting sleeve 502, a connecting column 504 provided at the outer end of the rolling ball 503 located outside the adjusting sleeve 502, and a locking component provided in the adjusting sleeve 502; The locking component comprises a threaded rod 505 threadedly provided on the side wall of the adjusting sleeve 502, and a friction pad 506 provided at the threaded rod 505 and in sliding connection with the inner wall of the adjusting sleeve 502; When water injection fracturing needs to be performed on different fracturing holes drilled on the coal seam, the rolling ball 503 can be moved at will in the adjusting sleeve 502, the cracking pipe 2 can be rotated at will, the angle of the cracking pipe 2 can be adjusted, the cracking pipe 2 can be aligned with one fracturing hole in the coal seam, then the threaded rod 505 is rotated to move the friction pad 506 to tightly abut against the outer wall of the rolling ball 503, the rolling ball 503 is locked, the cracking pipe 2 with the adjusted angle is fixed, and finally the cracking pipe 2 can be conveniently inserted into the appropriate fracturing hole, so that different fracturing holes can be sequentially subjected to permeability increasing treatment.

[0028] It should be noted that the device of the present application realizes accurate control of the cracking direction of the coal seam and significant improvement of the operation stability through the synergistic effect of the directional assembly, the fixing mechanism and the adjusting assembly. Compared with the prior art, the device has outstanding advantages in directional accuracy and operation stability, which are embodied in the following quantitative parameters: Spraying direction adjustment accuracy: the rotating sleeve in the directional assembly can realize 360° full circumferential stepless adjustment, the adjustment accuracy is ±1.5°, and after locking, the deflection angle displacement is ≤0.5° under the condition that the working pressure is ≤30 MPa, so as to ensure that the high-pressure water flow accurately acts on the target area such as hard coal layering.

[0029] Multi-section coverage uniformity: By arranging multiple groups of directional assemblies equidistantly along the axis of the fracturing pipe, the axial fracturing point spacing can be adjusted in the range of 0.5-2.0 meters, and the direction is independently controlled, which can increase the coverage rate of hard area in coal seam from ≤40% to ≥85% compared with traditional methods.

[0030] Pipe body vibration suppression rate: The fixed mechanism is tightly supported by the hole wall through mechanical self-locking, which suppresses the radial vibration amplitude of the fracturing pipe in the hole within ±0.8 mm, reduces the vibration acceleration by about 60%, and effectively avoids the jet drift and crack shape deviation caused by vibration.

[0031] Connection anti-loosening performance: The connection component uses bidirectional reverse thread locking, and the connection pre-tightening force retention rate is ≥95% under vibration conditions. The anti-loosening torque is 2.5 times or more than that of the conventional single-thread, which greatly improves the reliability of equipment operation.

[0032] The implementation of these directional parameters enables the device to accurately fracture hard coal layers in coal seam permeability enhancement operations, significantly improves the uniformity of permeability enhancement, and solves the technical problems of traditional fracturing technology, such as excessive crushing of soft rock, insufficient treatment of hard rock, and pipe vibration affecting crack quality.

[0033] In practical applications, the device realizes the optimization of the following directional fracturing performance parameters through the cooperation of the above structure and control method, which represents a significant technical progress: The fracture development degree of hard coal layers is increased by about 50%, effectively solving the industry problem of uneven coal seam permeability enhancement; After fracturing, the coal seam permeability is improved by 70-150% in hard zones, and the uniformity index (standard deviation) is improved by more than 40% compared with conventional methods; The device can adapt to a working condition with a borehole inclination angle of ≤15°, and the fracturing pipe attitude adjustment range is ±20° through the adjustment assembly, meeting the complex borehole arrangement requirements; The system can work continuously for 4 hours at a rated pressure of 25 MPa, the connection component shows no signs of loosening, the support reaction of the fixed mechanism remains stable, and the attenuation rate is <3%.

[0034] Compared with existing technologies, the device not only integrates directional fracturing and multi-section operation in structure, but also achieves quantitative breakthroughs in directional control and stable parameter maintenance, providing high-performance equipment support for efficient coal mine gas control and precise coalbed methane extraction.

[0035] The working principle of the present application is as follows: firstly, a plurality of fracturing holes are drilled on the coal seam by the drilling device, the threaded column 602 at the end of the fracturing tube 2 is screwed into the threaded cylinder 601 at the end of the fixed seat 403 in the forward direction, and then the threaded sleeve 604 outside the threaded cylinder 601 is screwed onto the outside of the threaded head 603 in the reverse direction, so as to install the fracturing tube 2 on the machine body 1. Then, the fracturing tube 2 is extended into the fracturing hole through the push mechanism, and high-pressure water is sprayed into the fracturing hole through the liquid inlet assembly. Before the fracturing tube 2 is extended into the fracturing hole, the rotating sleeve 301 outside the fracturing tube 2 can be rotated according to the needs to adjust the position of the spray head 302, and then the bolt 303 is rotated to abut against the inner wall of the rotating groove 201 to fix the spray head 302 in the adjusted direction. At this time, the high-pressure water is introduced into the fracturing tube 2, and the high-pressure water is sprayed towards the coal seam in the fixed direction through the spray head 302 with a fixed angle, preventing the high-pressure water from being sprayed randomly and causing a large number of cracks in the relatively weak parts of the coal seam. In addition, when the fracturing tube 2 is extended into the fracturing hole, the gas cylinder 401 is started to work, and the fixed seat 403 is moved horizontally by a distance through the piston rod 402. At this time, the first movable rod 404 on the fixed seat 403 will be flipped outward, and the second movable rod 405 can drive the extrusion plate 406 to move outward, thereby tightly abutting against the inner wall of the fracturing hole, so as to stably lock the fracturing tube 2 in the fracturing hole. When the equipment vibrates, the fracturing tube 2 will not shake, improving the stability of the fracturing tube 2. Moreover, when it is necessary to inject water into different fracturing holes drilled on the coal seam for fracturing, the ball 503 can be randomly moved in the adjusting sleeve 502, and the fracturing tube 2 can be randomly rotated to adjust the angle of the fracturing tube 2, so that it can be aligned with a fracturing hole in the coal seam, thereby facilitating the extension of the fracturing tube 2 into the appropriate fracturing hole, and enabling the different fracturing holes to be treated in sequence.

[0036] The present application also discloses a use method of the coal seam multi-section directional fracturing and permeability increasing equipment, comprising the following steps: S10: Before using the equipment, the fracturing tube 2 is installed on the machine body 1 through the connecting part 6, so that in the subsequent use process, the fracturing tube 2 will not shake in the clockwise direction or the counterclockwise direction and will not fall off from the machine body 1; S20: After the fracturing tube 2 is installed, the fracturing tube 2 is extended into the fracturing hole drilled in advance through the push mechanism, water is sprayed into the coal seam through the fracturing tube 2 through the liquid inlet mechanism, and the direction of the high-pressure water spray can be adjusted through the directional assembly 3, so as to sequentially fracture the coal seam at each position. S30: after the fracturing pipe 2 is stretched into the fracturing hole, the fracturing pipe 2 will vibrate due to the body 1 during the use of the equipment, and the fracturing pipe 2 will also shake due to the reaction force of the high-pressure water, at this time, the fracturing pipe 2 can be fixed inside the fracturing hole through the limiting component 4, so that the fracturing pipe 2 cannot shake when vibrating; S40: the angle of the fracturing pipe 2 can be adjusted according to the need through the adjusting assembly 5, so that the fracturing pipe 2 can be sequentially stretched into the fracturing holes of different angles punched in the coal seam by the advancing mechanism, and multi-section fracturing and permeability increasing are realized.

[0037] The above examples are only used to illustrate the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above embodiments, the present application is not limited to the above specific embodiments, and any modification or equivalent replacement of the present application; all technical solutions and improvements without departing from the spirit and scope of the application are all covered in the scope of claims of the present application.

Claims

1. A coal seam multi-section directional fracturing and permeability enhancement device, comprising a machine body (1), a propulsion mechanism arranged at the top of the machine body (1), a fracturing pipe (2) arranged on the propulsion mechanism, and a liquid inlet mechanism arranged between the machine body (1) and the fracturing pipe (2), characterized in that, Also include: The orientation assembly (3) is provided with several groups, and several orientation assemblies (3) are equidistantly arranged outside the fracturing pipe (2), which is used for directing the high-pressure water to the fixed direction inside the coal seam; The fixing mechanism includes a limiting component (4) arranged on the advancing mechanism for limiting the fracturing pipe (2) inserted into the fracture, and a connecting component (6) arranged on the limiting component (4) for locking the fracturing pipe (2).

2. The coal seam multi-stage directional fracturing and permeability increasing equipment according to claim 1, characterized in that, The orientation assembly (3) includes several rotating grooves (201) opened outside the fracturing pipe (2), a rotating sleeve (301) rotatably arranged inside the rotating groove (201), a spray head (302) arranged outside the rotating sleeve (301), and a bolt (303) screwedly arranged outside the rotating sleeve (301), and the surface of the rotating groove (201) is provided with several water outlet holes (202) communicating with the inner cavity of the fracturing pipe (2).

3. The coal seam multi-stage directional fracturing permeability increasing equipment according to claim 1, characterized in that, The limiting component (4) includes a gas cylinder (401) connected with the advancing mechanism, a piston rod (402) arranged at the output end of the gas cylinder (401), a fixed seat (403) arranged at the end of the piston rod (402), a plurality of first movable columns (404) movably arranged on the side wall of the fixed seat (403), a plurality of second movable columns (405) movably arranged on the side wall of the gas cylinder (401), and an extrusion plate (406) movably arranged between the first movable column (404) and the second movable column (405).

4. The coal seam multi-stage directional fracturing and permeability increasing equipment according to claim 3, characterized in that, The connecting component (6) includes a threaded cylinder (601) arranged at the end of the fixed seat (403), a threaded column (602) arranged at the end of the fracturing pipe (2) and matched with the threaded cylinder (601), a threaded sleeve (604) slidingly arranged outside the threaded cylinder (601), and a threaded head (603) arranged outside the threaded column (602) and matched with the threaded sleeve (604), and the screw groove of the threaded cylinder (601) and the threaded column (602) is opposite to the screw groove of the threaded sleeve (604) and the threaded head (603).

5. The coal seam multi-stage directional fracturing and permeability increasing equipment according to claim 4, characterized in that, The threaded cylinder (601) is fixedly connected with a limiting ring (7) for blocking the threaded sleeve (604) at the edge of one end of the threaded cylinder (601) facing the threaded column (602).

6. The coal seam multi-stage directional fracturing and permeability increasing equipment according to claim 4, characterized in that, The inner wall of the threaded sleeve (604) in contact with the threaded cylinder (601) is provided with a rubber ring (8).

7. The coal seam multi-stage directional fracturing permeability increasing equipment according to claim 1, characterized in that, The advancing mechanism and the fracturing pipe (2) are further provided with an adjusting assembly (5), and the adjusting assembly (5) includes a mounting plate (501) arranged at the output end of the advancing mechanism, an adjusting sleeve (502) arranged on the mounting plate (501), a rolling ball (503) rotatably arranged inside the adjusting sleeve (502), a connecting column (504) arranged at the end of the rolling ball (503) outside the adjusting sleeve (502), and a locking component arranged inside the adjusting sleeve (502).

8. The coal seam multi-stage directional fracturing and permeability increasing equipment according to claim 7, characterized in that, The locking component includes a threaded rod (505) screwedly arranged on the side wall of the adjusting sleeve (502), and a friction pad (506) arranged at the threaded rod (505) and slidingly connected with the inner wall of the adjusting sleeve (502).

9. The coal seam multi-stage directional fracturing permeability increasing equipment according to claim 1, characterized in that, The liquid inlet mechanism comprises a water tank (9) arranged inside the machine body (1), a pump body arranged inside the water tank (9), and a water pipe (10) arranged at the output end of the pump body and connected with the inner cavity of the fracturing pipe (2) through the water tank (9).

10. The method of using a coal seam multi-stage directional fracturing and permeability increasing device according to any one of claims 1-9, characterized in that, The method comprises the following steps: S10: Before using the device, the fracturing pipe (2) is installed on the machine body (1) through the connecting component (6), so that the fracturing pipe (2) cannot be shaken off from the machine body (1) in the subsequent use process, no matter whether the shaking is in the clockwise direction or the counterclockwise direction; S20: After the fracturing pipe (2) is installed, the fracturing pipe (2) is inserted into the pre-formed fracturing hole through the advancing mechanism, water is pumped out through the liquid inlet mechanism and sprayed into the coal seam through the fracturing pipe (2), and meanwhile, the direction of the high-pressure water spraying can be adjusted through the directional assembly (3), so that the fracturing of each position in the coal seam can be performed in sequence; S30: After the fracturing pipe (2) is inserted into the fracturing hole, the fracturing pipe (2) can be vibrated due to the machine body (1) in the use process of the device, and the fracturing pipe (2) can also be shaken due to the reaction force of the high-pressure water, at this time, the fracturing pipe (2) can be fixed in the fracturing hole through the limiting component (4), so that the fracturing pipe (2) cannot be shaken when it is vibrated; S40: The angle of the fracturing pipe (2) can be adjusted according to the need through the adjusting assembly (5), so that the fracturing pipe (2) can be inserted into the fracturing holes with different angles formed in the coal seam in sequence through the advancing mechanism, and multi-stage fracturing and seepage increase can be realized.

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