A drag-reducing deep drilling auxiliary device and method for goaf follow-pipe impact

Abstract

The present invention relates to a drag-reducing deep drilling auxiliary device and method for follow-up pipe impact in goaf, which belongs to the field of mining and underground engineering construction; it solves the problem that the friction generated between the pipe wall and the side wall of the goaf borehole during the follow-up pipe drilling process interferes with the smooth progress of the follow-up pipe impact operation in the goaf; the technical solution: comprises a pipe body placed in the goaf and an axis core arranged in the pipe body, an air bag is arranged between the pipe body and the axis core, a plurality of first through holes are arranged on the pipe body, an expansion sleeve is arranged in each first through hole, the expansion sleeve is matched with the first through hole, the expansion sleeve and the air bag cooperate with each other to make the expansion sleeve move along the axial direction of the first through hole, the expansion sleeve is provided with a spray hole, the spray holes on the two expansion sleeves are connected to each other through a curing agent pipeline, the curing agent pipeline is also connected to a curing agent storage device, the air bag is connected to a compressed air pipeline, and the compressed air pipeline is connected to an inflation device; the present invention is applied to the follow-up pipe impact operation in goaf.

Description

Technical Field

[0001] The invention provides a drag-reducing deep drilling auxiliary device and method for follow-pipe impact in goaf areas, belonging to the technical field of mining industry and underground engineering construction. Background Art

[0002] In goaf fire prevention and extinguishing operations, pipe percussion drilling allows deep penetration into the goaf, allowing the installation of various gas monitoring equipment and real-time, accurate monitoring of gas dynamics, providing a powerful basis for preventing goaf fires and other safety incidents. However, due to the complex and variable geological conditions in goafs, the borehole walls may shift, deform, or even collapse during the drilling process due to gravity and other geological stresses. This can lead to pipe jamming and deflection, resulting in significant friction between the pipe and the borehole wall. This friction not only consumes significant energy to overcome resistance, increasing energy costs, but also severely limits the penetration depth of the pipe. In actual projects, traditional pipe percussion drilling technology often only reaches a single penetration depth of 30 to 40 meters, which is insufficient to meet the requirements for comprehensive gas monitoring and efficient fire prevention and extinguishing operations deep into goafs. Pipe deflection also affects the accuracy of subsequent gas monitoring equipment installation and the effectiveness of fire extinguishing material injection, seriously disrupting smooth operations in the goaf.

[0003] Traditional measures to deal with friction include: 1. Applying grease to the outer wall of the pipe body. Although this can temporarily reduce the friction resistance between the pipe wall and the hole wall to a certain extent, in the environment of high humidity, strong erosion and complex media in the goaf, the grease will be quickly diluted and washed away, making it difficult to maintain a stable and long-lasting friction reduction effect. 2. Applying a special friction-reducing coating on the pipe body, but when facing long-term, high-intensity impact operations, the coating is prone to wear and peeling. It is costly and lacks durability, and cannot meet the needs of deep pipe drilling. Therefore, the development of a drag-reducing deep drilling auxiliary device for goaf-following pipe impact to break through the current difficulties of goaf-following pipe impact operations has become a key issue that needs to be urgently addressed in the industry. Summary of the Invention

[0004] In order to solve the technical problem that the friction generated between the pipe wall and the side wall of the goaf during the drilling process interferes with the smooth progress of the follow-pipe impact operation in the goaf, the present invention proposes a drag-reducing deep drilling auxiliary device and method for follow-pipe impact in the goaf, which can effectively reduce the friction between the pipe wall of the pipe body and the wall of the drill hole, and increase the impact depth of the pipe body.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a drag reduction deep drilling auxiliary device for goaf follow-up pipe impact, comprising a pipe body placed in the goaf and an axis core arranged in the pipe body, with an air bag arranged between the pipe body and the axis core;

[0006] The tube body is provided with a plurality of first through holes, each of which is provided with an expansion sleeve, which fits in the first through hole, and the expansion sleeve cooperates with the airbag to move the expansion sleeve along the axis of the first through hole;

[0007] The expansion sleeve is provided with a spray hole, and the spray holes on the expansion sleeves are connected to each other through a curing agent pipeline. The curing agent pipeline is also connected to a curing agent storage device, and the curing agent storage device is also connected to a pressure pump;

[0008] The air bag is connected to a compressed air pipeline, and the compressed air pipeline is connected to an inflation device.

[0009] Furthermore, a drill bit is provided on the end of the pipe body that contacts the goaf.

[0010] Furthermore, the extension line of the axis of the injection hole intersects with the extension line of the axis of the tube body.

[0011] Furthermore, a gap is left between the outer wall of the airbag and the inner wall of the tube body.

[0012] Furthermore, the airbag is provided with a steel cord.

[0013] Furthermore, a one-way valve is connected between the airbag and the inflation device.

[0014] Furthermore, the airbag is made of elastic material.

[0015] Furthermore, the tube body and the airbag are coaxially arranged.

[0016] Furthermore, the expansion sleeve is made of aluminum alloy.

[0017] A drag-reducing deep drilling method for impacting a pipe body in a goaf area comprises the following steps:

[0018] Step 1: Place the drag reduction deep drilling auxiliary device for goaf follow-up drilling into the borehole in the goaf to perform follow-up drilling operation;

[0019] Step 2: When a section of the pipe is drilled into the goaf, the pipe impact operation is stopped and compressed air is filled into the airbag. After the airbag expands to a preset state, the airbag acts on the expansion sleeve and pushes the expansion sleeve toward the goaf, causing the expansion sleeve to protrude from the outer wall of the pipe body and act on the side wall of the goaf hole, thereby forming a first space between the outer wall of the pipe body and the side wall of the goaf hole;

[0020] Step 3: injecting a curing agent into the first space, wherein the curing agent reacts chemically with the medium on the borehole wall of the goaf and then stands for a set time to solidify into a solidified body;

[0021] Step 4: Expel the compressed air in the airbag to restore the expansion sleeve to its initial state, and form a second space between the solid body and the outer wall of the tube body;

[0022] Step 5: Continue the pipe impact operation and repeat steps 1 to 4 above.

[0023] The beneficial effects of the present invention compared to the prior art are:

[0024] 1. The present invention can effectively reduce the friction between the pipe body and the goaf during the drilling process through the interaction of the pipe body, the air bag and the expansion sleeve. Compared with traditional friction reduction technologies, the device of the present invention has a long-lasting effect and low cost when used for goaf follow-up impact operations, greatly improving the efficiency of follow-up drilling, reducing energy consumption and increasing the drilling depth.

[0025] 2. The present invention uses the interaction of a pressure pump, a curing agent storage device, a curing agent pipeline, and an injection hole to rapidly inject a curing agent into the first space between the pipe body and the side wall of the goaf borehole. The curing agent reacts with media such as crushed rock on the side wall of the goaf borehole and solidifies into a solidified body. When the compressed air in the airbag is discharged, a second space is formed between the solidified body and the outer wall of the pipe body, effectively enhancing the stability of the side wall of the goaf borehole, avoiding the situation where the pipe-following impact operation is hindered due to the collapse of the side wall of the goaf borehole, and significantly improving the efficiency of the pipe-following impact operation.

[0026] 3. The drag-reducing deep drilling auxiliary device for follow-pipe impact in goaf of the present invention can enhance the stability of the side wall of the goaf borehole by reducing the friction between the pipe body and the goaf borehole during the drilling process. Under the action of the impact equipment, the depth of the pipe body when drilling in the goaf is increased. Compared with traditional drilling technology, the single drilling depth can be increased by 1 to 2 times, which greatly shortens the construction period and improves the efficiency of follow-pipe impact operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 Schematic diagram of the positional relationship between the pipe body of the present invention and the side wall of the goaf borehole Figure 1 ;

[0030] Figure 3 Schematic diagram of the positional relationship between the pipe body of the present invention and the side wall of the goaf borehole Figure 2 ;

[0031] Figure 4Schematic diagram of the positional relationship between the pipe body of the present invention and the side wall of the goaf borehole Figure 3 ;

[0032] Figure 5 Schematic diagram of the positional relationship between the pipe body of the present invention and the side wall of the goaf borehole Figure 4 ;

[0033] Figure 6 A schematic structural diagram of the initial state of the expansion sleeve of the present invention;

[0034] Figure 7 is a schematic structural diagram of the airbag of the present invention after being filled with compressed gas;

[0035] Figure 8 It is a schematic structural diagram of the cooperation between the tube body and the expansion sleeve of the present invention;

[0036] Figure 9 It is a schematic structural diagram of the cooperation between the air bag and the expansion sleeve of the present invention;

[0037] Figure 10 This is a flow chart of the drag reduction deep drilling method for goaf pipe impact of the present invention;

[0038] In the figure: 1 is the pipe body, 2 is the expansion sleeve, 3 is the goaf, 4 is the injection hole, 5 is the air bag, 6 is the drill bit, 7 is the compressed air pipeline, 8 is the curing agent pipeline, 9 is the drill rod, 10 is the side wall of the borehole, 11 is the compressed air pipeline joint, 12 is the curing agent pipeline joint, and 13 is the second space interval. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate relative positions or positional relationships, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] like Figures 1 to 10 As shown, the present invention provides a drag-reducing deep drilling auxiliary device for goaf follow-up pipe impact, comprising a pipe body 1 placed in the goaf 3 and a shaft core connected to the pipe body 1. An airbag 5 is connected between the pipe body 1 and the shaft core, and the airbag 5 is made of an elastic material. Specifically, the airbag 5 is fixedly connected to the shaft core in a circumferential direction. A compressed air line 7 is connected to the airbag 5, and the compressed air line 7 is connected to the inflation device via a compressed air line connector 11. A one-way valve is connected between the airbag 5 and the inflation device, and the one-way valve controls the on-off connection between the inflation device and the airbag 5.

[0042] A drill bit 6 is provided on the end of the tube body 1 that contacts the goaf 3. The drill bit 6 and the tube body 1 are coaxially arranged. Several first through-holes are circumferentially formed on the tube body 1, and multiple first through-holes are evenly distributed throughout the tube body 1. Each first through-hole is movably connected to an expansion sleeve 2 made of aluminum alloy. A gap is left between the outer wall of the airbag 5 and the inner wall of the tube body 1. Specifically, the distance between the outer end of the expansion sleeve 2 and the central axis of the tube body 1 is no greater than the distance between the outer wall and the central axis of the tube body 1, and the distance between the inner end of the expansion sleeve 2 and the central axis of the tube body 1 is less than the distance between the inner wall and the central axis of the tube body 1. The inner wall of the expansion sleeve 2 contacts the outer wall of the airbag 5. During the pipe impact operation, the expansion sleeve 2 is in a contracted state (initial state). The contracted state of the expansion sleeve 2 is: the outer end of the expansion sleeve 2 and the outer wall of the pipe body 1 are in the same plane, or the outer end of the expansion sleeve 2 is in the first through hole, reducing the friction between the pipe body 1 and the borehole in the goaf 3 during the drilling process, while avoiding damage to the expansion sleeve 2.

[0043] The expansion sleeve 2 fits in with the first through hole, and the expansion sleeve 2 cooperates with the air bag 5 to enable the expansion sleeve 2 to move along the axial direction of the first through hole, that is, the expansion sleeve 2 can move along the first through hole toward the borehole side wall 10 of the goaf 3, or it can move along the first through hole toward the center axis direction of the tube body 1. When the expansion sleeve 2 moves along the first through hole toward the borehole side wall 10 of the goaf 3, the expansion sleeve 2 protrudes from the outer wall of the tube body 1 and acts on the borehole side wall 10 of the goaf 3, so that a first space gap is formed between the outer wall of the tube body 1 and the borehole side wall 10 of the goaf 3, thereby reducing the contact area between the tube body 1 and the borehole side wall 10 of the goaf 3, and thereby reducing the friction between the tube body 1 and the borehole side wall 10 of the goaf 3.

[0044] An injection hole 4 is provided on the expansion sleeve 2, and the extension line of the axis of the injection hole 4 intersects with the extension line of the axis of the tube body 1. The injection holes 4 on the two expansion sleeves 2 are connected to each other through a curing agent pipeline 8. The curing agent pipeline 8 is also connected to a curing agent storage device through a curing agent pipeline joint 12. The curing agent storage device is also connected to a pressure pump. After the pressure pump is turned on, the curing agent in the curing agent storage device passes through the curing agent pipeline 8 and the injection hole 4 in a high-pressure state in turn and is evenly covered on the crushed rock on the side wall 10 of the borehole in the goaf 3 in a fan-shaped or columnar form.

[0045] Preferably, the tube body 1 and the airbag 5 are coaxially arranged.

[0046] Preferably, the airbag 5 is made of rubber.

[0047] Preferably, steel cords are embedded in the airbag 5 to prevent the airbag 5 from being scratched or excessively deformed.

[0048] The present invention provides a drag-reducing deep drilling method for impacting a pipe body in a goaf area, comprising the following steps:

[0049] Step 1: Place the above-mentioned drag reduction deep drilling auxiliary device for goaf pipe impact into the borehole of goaf 3 and cooperate with the drill rod 9 to perform pipe impact operation, as shown in the following figure: Figure 2 As shown, when the goaf 3 is undergoing a follow-pipe impact operation, the expansion sleeve 2 is in a contracted state. At this time, the outer wall of the pipe body 1 is in close contact with the borehole side wall 10 of the goaf 3. The pipe body 1 needs to overcome the friction force from the borehole side wall 10 of the goaf 3 and the extrusion force during the impact operation.

[0050] Step 2: When a section of the pipe body 1 is drilled into the goaf 3, stop the pipe impact operation and fill the airbag 5 with compressed air. After the airbag 5 expands to a preset state, the airbag 5 acts on the expansion sleeve 2 and pushes the expansion sleeve 2 toward the goaf 3, so that the expansion sleeve 2 protrudes from the outer wall of the pipe body 1 and acts on the side wall 10 of the borehole in the goaf 3. Specifically, the inflation device is turned on and compressed air is filled into the airbag 5. During the gradual expansion process, the airbag 5 can evenly push the expansion sleeve 2 on the outside of the airbag 5 along the outer wall of the protruding tube body 1 along the first through hole by virtue of its high elasticity, and push the broken rocks on the borehole side wall 10 of the goaf 3. Since the broken rocks in the goaf 3 are relatively loose, some of the broken rocks will be displaced under the push of the expansion sleeve 2. At this time, the borehole diameter of the goaf 3 is expanded and the borehole side wall 10 of the goaf 3 is stabilized. A first space gap is formed between the outer wall of the tube body 1 and the borehole side wall 10 of the goaf 3. At this time, the positional relationship between the tube body 1 and the borehole side wall 10 of the goaf 3 is as follows: Figure 3 shown.

[0051] Step 3: Start the pressure pump and inject the curing agent in the curing agent storage device into the first space through the curing agent pipeline 8 and the injection hole 4 in sequence. The curing agent reacts chemically with the crushed rock and other media on the borehole side wall 10 of the goaf 3. After standing for a set time, a solid body with a certain strength is formed, which can enhance the stability of the borehole side wall 10 of the goaf 3. The position relationship is as follows: Figure 4 The setting time is set according to the reaction characteristics of the curing agent and the medium on the borehole sidewall 10 of the goaf 3, as long as the curing agent is ensured to fully solidify after reacting with the medium on the borehole sidewall 10 of the goaf 3.

[0052] In this embodiment, the curing agent is prepared by mixing magnesite (MgO-MgCl2) and fly ash in a ratio of 60:40. The fly ash may also be replaced by slag.

[0053] Step 4: Open the one-way valve connected between the airbag 5 and the inflation device to discharge the compressed air in the airbag 5. The airbag 5 gradually shrinks, thereby driving the expansion sleeve 2 to return to its initial state. At this time, a second space gap 13 is formed between the solid body and the outer wall of the tube body 1, avoiding close contact between the tube body 1 and the borehole side wall 10 of the goaf 3. The appearance of the second space gap 13 effectively reduces the effective contact area between the outer wall of the tube body 1 and the borehole side wall 10 of the goaf 3, thereby reducing the friction between the two, and increasing the depth of drilling into the goaf 3 during the follow-up pipe impact operation, meeting the needs of comprehensive gas monitoring and efficient fire prevention and extinguishing operations in the goaf 3. Its position relationship is as follows Figure 5 shown.

[0054] Step 5: Continue the pipe impact operation and repeat steps 1 to 4 above.

[0055] Through the interaction of the pipe body 1, airbag 5, and expansion sleeve 2, the present invention reduces friction between the pipe and the sidewall 10 of the goaf 3, compared to conventional methods that apply grease or a friction-reducing coating to the outer wall of the follower pipe. This device, based on the drag-reducing deep drilling auxiliary device for goaf follower pipe impact, performs goaf follower pipe impact operations in the present invention. By reducing the contact area between the outer wall of the pipe body 1 and the sidewall 10 of the goaf 3, friction between the pipe body 1 and the goaf 3 is reduced. This long-lasting effect is low-cost, significantly improving follower pipe drilling efficiency, reducing energy consumption, and increasing drilling depth. Experiments have shown that friction can be reduced by 60%-80%.

[0056] Regarding the specific structure of the present invention, it should be noted that the connection relationship between the various component modules adopted in the present invention is definite and feasible. Except for those specifically described in the embodiments, the specific connection relationship can bring about corresponding technical effects and solve the technical problems raised by the present invention without relying on the execution of corresponding software programs. The components, modules, models of specific components appearing in the present invention, the connection methods between each other, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, except for those specifically described, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technology and common knowledge in this field. There is no need to elaborate, so that the technical solution provided in this case is clear, complete, and feasible, and the corresponding physical products can be reproduced or obtained based on this technical means.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drag-reducing deep drilling auxiliary device for goaf follow-pipe impact, characterized by: It comprises a tube body (1) placed in a goaf (3) and an axial core arranged in the tube body (1), with an air bag (5) arranged between the tube body (1) and the axial core; The tube body (1) is provided with a plurality of first through holes, and an expansion sleeve (2) is provided in each first through hole. The expansion sleeve (2) fits in the first through hole, and the expansion sleeve (2) and the air bag (5) cooperate with each other to enable the expansion sleeve (2) to move along the axis direction of the first through hole; The expansion sleeve (2) is provided with a spray hole (4), and the spray holes (4) on two expansion sleeves (2) are connected to each other through a curing agent pipeline (8), and the curing agent pipeline (8) is also connected to a curing agent storage device, and the curing agent storage device is also connected to a pressure pump; The air bag (5) is connected to a compressed air pipeline (7), and the compressed air pipeline (7) is connected to an inflation device.

2. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: A drill bit (6) is provided on one end of the pipe body (1) that contacts the goaf (3).

3. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: The extension line of the axis of the injection hole (4) intersects with the extension line of the axis of the tube body (1).

4. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: A gap is left between the outer wall of the airbag (5) and the inner wall of the tube body (1).

5. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: The airbag (5) is provided with a steel cord.

6. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: A one-way valve is connected between the airbag (5) and the inflation device.

7. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: The airbag (5) is made of elastic material.

8. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: The tube body (1) and the airbag (5) are coaxially arranged.

9. The drag-reducing deep drilling auxiliary device for goaf follow-pipe impact according to claim 1 is characterized in that: The expansion sleeve (2) is made of aluminum alloy.

10. A drag-reducing deep drilling method for impacting a pipe body in a goaf area, characterized in that: The following steps are involved: Step 1: Place the drag-reducing deep drilling auxiliary device for goaf follow-up impact according to any one of claims 1 to 9 into the borehole of the goaf (3) to perform follow-up impact operation; Step 2: When a section of the pipe body (1) is drilled into the goaf (3), the pipe impact operation is stopped, and compressed air is filled into the airbag (5). After the airbag (5) is expanded to a preset state, the airbag (5) acts on the expansion sleeve (2) and pushes the expansion sleeve (2) toward the goaf (3), so that the expansion sleeve (2) protrudes from the outer wall of the pipe body (1) and acts on the side wall (10) of the borehole of the goaf (3), so that a first space is formed between the outer wall of the pipe body (1) and the side wall (10) of the borehole of the goaf (3); Step 3: injecting a curing agent into the first space, wherein the curing agent reacts chemically with the medium on the side wall (10) of the borehole in the goaf (3), and then the curing agent is allowed to stand for a period of time to solidify into a solidified body; Step 4: Expel the compressed air in the airbag (5) to restore the expansion sleeve (2) to its initial state, and form a second space (13) between the solid body and the outer wall of the tube body (1); Step 5: Continue the pipe impact operation and repeat steps 1 to 4 above.

Images