A device for hole protection using a self-expanding stent

Abstract

The application discloses a device for hole protection using a self-expanding support, comprising the following steps: S1, device transportation; S2, guiding and positioning device detection; S3, spherical air bag inflation; S4, expansion of the self-expanding support and automatic internal support device; S5, recovery of the spherical air bag and guide pipe; S6, gas extraction; and S7, recovery of the self-expanding support and automatic internal support device. The device can be used for hole protection treatment of a drill hole with a large bending degree, and can also be lowered into a deep hole, and the self-expanding support can be expanded into a cylindrical metal net in the hole, thereby achieving a very good supporting effect on the drill hole, effectively preventing the occurrence of hole blocking and hole collapse, and compared with the hole protection method of lowering a screen pipe and a casing pipe, the whole process of hole protection is realized, and the efficiency of coal bed gas extraction is better ensured. In addition, the device can be recycled and used multiple times, thereby greatly saving the hole protection cost.

Description

Technical Field

[0001] This invention relates to the technical field of gas extraction borehole protection, specifically a device for using a self-expanding support to achieve borehole protection. Background Technology

[0002] Gas drainage is an important technical means for gas prevention and utilization. The drainage method is borehole drainage. However, during the drainage process, the coal body is subject to gravity, gas pressure and other factors, which makes the borehole wall extremely unstable. During the drainage process, blockage and collapse are very likely to occur, which will hinder the gas drainage process and greatly reduce the drainage efficiency.

[0003] In recent years, methods such as screen pipe protection and casing protection have been used to reinforce and maintain gas drainage boreholes, which has greatly reduced the occurrence of borehole blockage and collapse, and significantly improved the efficiency of gas drainage.

[0004] However, during the process of lowering the screen pipe and casing, the borehole exhibits varying degrees of bending. Since the screen pipe and casing are made of rigid materials, once a large bend occurs, the screen pipe and casing will be unable to continue to be lowered. Sometimes, the screen pipe and casing may even deform or break, seriously affecting the borehole protection efficiency of gas drainage boreholes. Summary of the Invention

[0005] The purpose of this invention is to provide a device for borehole protection using a self-expanding support to solve the aforementioned problems. This device expands the self-expanding support inside the borehole using a spherical airbag, thereby reinforcing the borehole after the protection device is inserted deep into the borehole. This solves the problem of unsatisfactory borehole protection depth and theoretically allows for full-process borehole protection. This addresses the issues in the background art where the borehole wall stability is extremely poor due to factors such as coal seam gravity and gas pressure, easily leading to blockage and collapse during extraction, hindering gas extraction, significantly reducing extraction efficiency, and the problem of unsatisfactory borehole protection depth due to coal seam obstruction.

[0006] The present invention achieves the above-mentioned objective through the following technical solution: a device for protecting holes using a self-expanding bracket, comprising the following steps:

[0007] S1. Device conveying; S2. Guiding and positioning device detection; S3. Spherical airbag inflation; S4. Expansion of self-expanding support and automatic internal support device; S5. Recovery of spherical airbag and guide tube; S6. Gas extraction; S7. Recovery of self-expanding support and automatic internal support device.

[0008] S1. Equipment transportation: Mechanical transportation is adopted, and the power for the guide tube to move forward is provided by machinery.

[0009] S2. Guiding and positioning device detection: After the front end of the guide tube enters the hole, the guiding and positioning device located at the top of the guide tube can be activated to monitor the position of the guide tube and the situation inside the hole in real time during transportation.

[0010] S3. Spherical airbag inflation: When the guide tube reaches the designated position inside the hole, the air pump can be used to inflate the spherical airbag through the inflation and deflation holes, causing the spherical airbag to inflate.

[0011] S4. Expansion of the self-expanding support and automatic internal support device: After the spherical airbag is inflated, it will cause the self-expanding support and automatic internal support device attached to the surface to expand.

[0012] S5. Recovery of the spherical airbag and guide tube: The spherical airbag is deflated to reduce its original volume, and then the spherical airbag and guide tube are recovered.

[0013] S6. Gas extraction: The end of the self-expanding support is sealed to extract gas.

[0014] S7. Recycling of the self-expanding bracket and automatic internal support device: The triangular bracket is retracted by an electromagnetic device inside the triangular bracket, which in turn drives the self-expanding bracket and automatic internal support device to retract. Once the self-expanding bracket and automatic internal support device have retracted to their original shape, they can be recycled.

[0015] Furthermore, during the detection of the guide positioning device, the monitoring device in front of the guide positioning device is turned on to detect the specific situation inside the borehole in real time. If there is any obstruction or bending, the direction of the guide tube can be changed by controlling the swing device in the guide positioning device to ensure that the guide tube can be transported to the deepest part of the hole.

[0016] Furthermore, both the self-expanding bracket and the automatic internal support device are made of metal and are processed by welding.

[0017] Furthermore, the automatic internal support device is fixed by a latch in the internal triangular bracket. Under the action of the electromagnetic device, the latch in the triangular bracket will be engaged in the slot, thereby fixing the automatic internal support device.

[0018] Furthermore, the retraction of the self-expanding bracket and the automatic internal support device utilizes the internal triangular bracket as the power for retraction. By energizing the electromagnetic device, the latch inside the triangular bracket pops out of the slot. Then, under the tension of the small tension spring inside the triangular bracket, the automatic internal support device retracts, which in turn drives the self-expanding bracket to retract as well.

[0019] Furthermore, the guide tube is a flexible tube for better transport of the hole protector.

[0020] The beneficial effects of using this invention are as follows: The device of this invention can not only perform borehole protection treatment for boreholes with large curvatures, but also lower the protective pipe deep into the borehole. Through a self-expanding support, it unfolds into a cylindrical metal mesh inside the borehole, providing excellent support and effectively preventing borehole blockage and collapse. Compared to borehole protection methods using screen pipes and casing pipes, this method achieves full-process borehole protection, better ensuring the efficiency of coalbed methane extraction. Furthermore, it can be recycled and reused multiple times, maximizing cost savings in borehole protection. Attached Figure Description

[0021] Figure 1 A connection diagram of a device that uses a self-expanding bracket to achieve hole protection.

[0022] Figure 2 This is a schematic diagram of the spherical airbag in operation.

[0023] Figure 3 This is a cross-sectional schematic diagram of the automatic internal support device.

[0024] Figure 4 This is a schematic diagram showing the automatic internal support device in the open position.

[0025] Figure 5 This is a schematic diagram of one side of a triangular support.

[0026] Figure 6 This is a cross-sectional view of the airbag when it is deployed.

[0027] Figure 7 A top view of a device that uses a self-expanding bracket to achieve hole protection.

[0028] Figure 8 This is a schematic diagram of a guiding and positioning device.

[0029] Figure 9 It is an operation flowchart

[0030] In the diagram: 1. Self-expanding support; 2. Spherical airbag; 3. Guide tube; 4. Inflation and deflation port; 5. Automatic internal support device; 6. Guide and positioning device; 7. Electromagnetic device; 8. Slot; 9. Bolt; 10. Small tension spring; 11. Triangular support; 12. Monitoring device; 13. Swinging device; 14. Metal casing. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] This invention discloses a device for achieving hole protection using a self-expanding bracket, comprising:

[0033] Self-expanding stents: mimicking the principle of medical vascular stents, self-expanding stents use stretchable metal materials. When they expand and unfold, they form a cylindrical metal mesh inside the hole, reinforcing the borehole.

[0034] Spherical airbag: Made of rubber material, with an external self-expanding bracket and automatic internal support device. There is an inflation and deflation hole at the end of the opening. When inflated, the rubber material expands and deforms, and when deflated, the rubber material compresses and deforms.

[0035] Guide tube: It adopts a flexible hose, with a guiding and positioning device and a swing device at the front end, and an external spherical airbag. It is mainly responsible for the transportation of the device.

[0036] Automatic internal support: Made of metal, with an internal triangular bracket, which is mainly used to fix the hole protection equipment.

[0037] Guiding and positioning device: It contains a monitoring device and a swinging device. The monitoring device is responsible for positioning and monitoring during transportation, and the swinging device simulates the biological swinging of a fish tail, which can slightly change the direction of travel of the front end of the guide tube.

[0038] Electromagnetic device: The main internal component is an electromagnetic coil. When not energized, it is responsible for generating a pushing force on the two latches on both sides, and when energized, it is responsible for generating a pulling force on the two latches on both sides.

[0039] Small tension spring: Located in the middle of the three sides of the triangular support, it mainly provides power for the contraction of the triangular support.

[0040] References in this embodiment Figure 1 , Figure 3 Includes the following steps:

[0041] First, the guide tube 3 is fed into the borehole using transport machinery. At the same time, the guide positioning device 6 at the front end of the guide tube 3 is activated. The monitoring device at the front end of the guide positioning device 6 will monitor the transport situation in real time. Through signal transmission, the degree of bending in the hole and other conditions will be displayed on the operation screen. If a bending part is encountered, the direction can be adjusted by a small angle by operating the swing device 13 in the guide device 6, thereby changing the transport direction of the entire guide tube and allowing the guide tube to move to a deeper depth.

[0042] Furthermore, when the guide tube 3 reaches the designated position, the spherical airbag 2 is inflated and opened, which will drive the expansion of the self-expanding bracket 1 and the automatic internal support device 5.

[0043] When the automatic internal support device 5 expands to the designated position, the internal latch 9 will engage with the slot 8 to secure the protective hole device. At this time, the spherical airbag 2 is deflated, and after deflation, its shape will return to its original state. Then, the spherical airbag 2 and the guide tube 3 can be pulled out of the hole together.

[0044] Finally, after the gas extraction is complete, the automatic internal support device 5 is energized, and the latch 9 is retracted from the slot 8 into the triangular bracket. At this time, the triangular bracket will retract under the action of the small tension spring 10, thereby realizing the retraction of the automatic internal support device 5. The automatic internal support device 5 will also drive the self-expanding bracket 1 to retract. At this time, the hole protection device will return to its original state, so that the hole protection device can be pulled out of the hole, realizing the recovery of the equipment.

Claims

1. A method of implementing hole protection using a self-expanding stent, characterized by, It comprises the following steps: S1, device transportation: using mechanical transportation, the mechanical power is provided to guide the tube (3) to move forward; S2, guiding and positioning detection: after the front end of the guide tube (3) enters the hole, the guiding and positioning device (6) at the top of the guide tube is opened, and the specific situation inside the hole is detected in real time through the monitoring device (12) contained therein. If there is an obstacle or a bend, the moving posture of the guide tube (3) can be changed by controlling the swing device (13) in the guiding and positioning function, so as to ensure that the guide tube (3) is accurately transported to the specified position in the hole; S3, spherical air bag inflation: when the guide tube (3) reaches the specified position in the hole, the inflation pump is started, and gas is injected into the spherical air bag (2) through the gas charging and discharging hole (4), so that the spherical air bag (2) is inflated to a preset volume; S4, expansion of self-expanding stent and automatic internal support device: after the spherical air bag (2) is inflated, the self-expanding stent (1) and the automatic internal support device (5) with triangular support (11) as the support basis are expanded synchronously, wherein the self-expanding stent (1) is unfolded in the hole to form a cylindrical metal mesh; after the expansion is completed, the clamping bolt (9) in the triangular support (11) is clamped into the clamping groove (8) under the action of the electromagnetic device (7), so as to realize the fixation of the automatic internal support device (5), and the automatic internal support device (5) further supports the self-expanding stent (1); S5, spherical air bag and guide tube recovery: the spherical air bag (2) is deflated to its original volume, and then the spherical air bag (2) and the guide tube (3) are recovered; S6, gas extraction: the end of the self-expanding stent (1) is sealed and blocked, and the gas extraction equipment is started to carry out gas extraction operation; S7, recovery of self-expanding stent and automatic internal support device: the clamping bolt (9) is ejected from the clamping groove (8) by energizing the electromagnetic device (7) in the triangular support (11); the triangular support (11) is driven to retract by the tension of the small tension spring (10) in the triangular support (11), and then the automatic internal support device (5) and the self-expanding stent (1) are retracted with the triangular support (11) to recover to the non-unfolded state; after the retraction is completed, the self-expanding stent (1) and the automatic internal support device (5) are recovered.

2. The method of claim 1, wherein the self-expanding stent is a self- expanding stent graft. The monitoring device (12) in the guiding and positioning device (6) detects the specific situation inside the hole in real time, and if there is an obstacle or a bend, the moving posture of the guide tube (3) can be changed by controlling the swing device (13) in the guiding and positioning device (6), so as to ensure that the guide tube (3) can be transported to the deepest part of the hole.

3. The method of claim 1, wherein the self-expanding stent is a self- expanding stent graft. The guiding and positioning device (6) is wrapped outside by a smooth metal shell (14) to reduce the resistance generated during transportation.

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