Anti-drag deep drilling auxiliary device and method for goaf pipe-following impact

Abstract

The invention discloses a resistance-reducing deep drilling auxiliary device and method for goaf casing-following impact, and belongs to the field of mining industry and underground engineering construction. The problem that friction force generated between the pipe wall and the side wall of a drilling hole in a goaf disturbs smooth proceeding of goaf follow-pipe impact operation in the follow-pipe drilling process is solved. According to the technical scheme, the device comprises a pipe body arranged in a goaf and a shaft core arranged in the pipe body, an air bag is arranged between the pipe body and the shaft core, a plurality of first through holes are formed in the pipe body, an expansion sleeve is arranged in each first through hole, the expansion sleeves are matched with the first through holes, and the expansion sleeves are matched with the air bag so that the expansion sleeves can move in the axis direction of the first through holes; injection holes are formed in the expansion sleeves, the injection holes in every two expansion sleeves are communicated with each other through a curing agent pipeline, the curing agent pipelines are further connected with a curing agent storage device, the air bag is connected with a compressed air pipeline, and the compressed air pipeline is connected to inflation equipment; the method is applied to the goaf follow-pipe impact operation.

Description

Technical Field

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

[0002] In the fire prevention and extinguishing work in goaf areas, through the impact drilling of pipe bodies, it is possible to penetrate deep into the goaf area, install various types of gas monitoring equipment, and grasp the gas dynamics in real time and accurately, providing a strong basis for preventing safety accidents such as goaf fires. However, due to the complex and changeable geological conditions in goaf areas, the wall of the goaf borehole may move, deform, or even collapse due to gravity and other geological stresses during the drilling process of the pipe body, which may cause problems such as pipe body jamming and deflection, and then cause greater friction between the pipe wall and the hole wall. This friction not only requires the impact equipment to consume a lot of energy to overcome resistance, increasing energy costs, but also severely limits the impact depth of the pipe body. In actual engineering, the single drilling depth of traditional pipe body impact technology can often only reach 30 to 40 meters, which is difficult to meet the needs of comprehensive gas monitoring and efficient fire prevention and extinguishing operations in goaf areas. The deflection of the pipe body will also affect the installation accuracy of subsequent gas monitoring equipment and the injection effect of fire extinguishing materials, seriously interfering with the smooth progress of goaf operations.

[0003] Traditional measures to deal with friction include: 1. Apply 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 scouring and complex media in the goaf, the grease will be quickly diluted and washed away, making it difficult to maintain a stable and lasting friction reduction effect. 2. Apply 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 follow-up pipe impact to break through the current difficulties of goaf follow-up pipe impact operations has become a key issue that needs to be urgently resolved in the industry. Summary of the invention

[0004] In order to solve the technical problem that the friction force generated between the pipe wall and the side wall of the borehole in 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 force between the pipe wall of the pipe body and the wall of the borehole 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: a drag reduction deep drilling auxiliary device for goaf area follow-up pipe impact, comprising a pipe body placed in the goaf and an axis core arranged in the pipe body, and an air bag is arranged between the pipe body and the axis core; The tube body is provided with a plurality of first through holes, each of which is provided with an expansion sleeve, which fits with the first through hole, and the expansion sleeve cooperates with the airbag to move the expansion sleeve along the axis direction of the first through hole; 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, and 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; The airbag is connected with a compressed air pipeline, and the compressed air pipeline is connected to the inflation device.

[0006] Furthermore, a drill bit is provided on one end of the pipe body that contacts the goaf.

[0007] Furthermore, the extension line of the axis of the injection hole intersects with the extension line of the axis of the tube body.

[0008] Furthermore, a gap is left between the outer wall of the airbag and the inner wall of the tube body.

[0009] Furthermore, the airbag is provided with a steel cord.

[0010] Furthermore, a one-way valve is connected between the airbag and the inflation device.

[0011] Furthermore, the airbag is made of elastic material.

[0012] Furthermore, the tube body and the airbag are coaxially arranged.

[0013] Furthermore, the expansion sleeve is made of aluminum alloy.

[0014] A drag-reducing deep drilling method for impacting a pipe body in a goaf area comprises the following steps: Step 1: Place the drag reduction deep drilling auxiliary device for goaf follow-up pipe impact described above into the borehole in the goaf to perform follow-up pipe impact operation; Step 2: When a section of the pipe body 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, so that the expansion sleeve protrudes from the outer wall of the pipe body and acts on the side wall of the hole in the goaf, so that a first space interval is formed between the outer wall of the pipe body and the side wall of the hole in the goaf; Step 3: injecting a curing agent into the first space interval, wherein the curing agent reacts chemically with the medium on the borehole wall of the goaf area and then stands for a set time to solidify into a solidified body; 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; Step 5: Continue the pipe impact operation and repeat steps 1 to 4 above.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention can effectively reduce the friction between the pipe body and the goaf borehole during the drilling process through the mutual cooperation of the pipe body, the air bag and the expansion sleeve. Compared with the traditional friction reduction technology, the device of the present invention is used for the goaf follow-up pipe impact operation, which has a long-lasting effect and low cost, greatly improves the follow-up pipe drilling efficiency, reduces energy consumption, and increases the drilling depth; 2. The present invention quickly injects the curing agent into the first space between the pipe body and the side wall of the goaf borehole through the cooperation of the pressure pump, the curing agent storage device, the curing agent pipeline and the injection hole. The curing agent reacts with the medium such as the broken 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, which effectively enhances the stability of the side wall of the goaf borehole, avoids the situation where the pipe-following impact operation is blocked due to the collapse of the side wall of the goaf borehole, and greatly improves the efficiency of the pipe-following impact operation. 3. During the drilling operation in the goaf, the drag-reducing deep drilling auxiliary device for follow-pipe impact in the present invention reduces the friction between the pipe body and the borehole in the goaf during the drilling process, thereby enhancing the stability of the side wall of the borehole in the goaf. 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 the follow-pipe impact operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The positional relationship between the pipe body of the present invention and the side wall of the goaf borehole is shown in FIG. Figure 1 ; Figure 3 The positional relationship between the pipe body of the present invention and the side wall of the goaf borehole is shown in FIG. Figure 2 ; Figure 4 The positional relationship between the pipe body of the present invention and the side wall of the goaf borehole is shown in FIG. Figure 3 ; Figure 5 The positional relationship between the pipe body of the present invention and the side wall of the goaf borehole is shown in FIG. Figure 4 ; Figure 6 A schematic structural diagram of the initial state of the expansion sleeve of the present invention; Figure 7 It is a schematic diagram of the structure of the air bag of the present invention after being filled with compressed gas; Figure 8It is a schematic diagram of the structure of the tube body and the expansion sleeve cooperating with each other in the present invention; Fig. 9 It is a schematic diagram of the structure of the air bag and the expansion sleeve cooperating with each other in the present invention; Fig.10 It is a flow chart of the drag reduction deep drilling method for goaf area pipe body impact of the present invention; In the figure: 1 is the tube 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

[0017] 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, rather than indicating or implying 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", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. 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.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0019] 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 an axis core connected to the pipe body 1, an airbag 5 is connected between the pipe body 1 and the axis core, and the airbag 5 is made of elastic material. Specifically, the airbag 5 is circumferentially fixedly connected to the axis core. A compressed air pipeline 7 is connected to the airbag 5, and the compressed air pipeline 7 is connected to the inflation device through a compressed air pipeline 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 of the inflation device and the airbag 5.

[0020] A drill bit 6 is provided at one end of the tube body 1 that contacts the goaf 3, and the drill bit 6 and the tube body 1 are coaxially arranged. A plurality of first through holes are opened circumferentially on the tube body 1, and the plurality of first through holes are evenly distributed on the tube body 1, and each first through hole is movably connected with an expansion sleeve 2, and the expansion sleeve 2 is 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 not greater than the distance between the outer wall of the tube body 1 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 of the tube body 1 and the central axis of the tube body 1, and the inner wall of the expansion sleeve 2 is in contact with 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, which reduces the friction between the pipe body 1 and the borehole in the goaf 3 during the drilling process, and avoids damage to the expansion sleeve 2.

[0021] The expansion sleeve 2 fits 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 can move along the first through hole toward the central 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 further reducing the friction between the tube body 1 and the borehole side wall 10 of the goaf 3.

[0022] 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 expansion sleeves 2 are interconnected 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 turn under high pressure in a fan-shaped or columnar form and is evenly covered on the broken rock on the side wall 10 of the borehole in the goaf 3.

[0023] Preferably, the tube body 1 and the airbag 5 are coaxially arranged.

[0024] Preferably, the airbag 5 is made of rubber.

[0025] Preferably, steel cords are embedded in the airbag 5 to prevent the airbag 5 from being scratched or excessively deformed.

[0026] The present invention provides a drag-reducing deep drilling method for impacting a pipe body in a goaf area, comprising the following steps: Step 1: Place the drag reduction deep drilling auxiliary device for goaf follow-up pipe impact into the borehole of goaf 3 and cooperate with the drill rod 9 to perform follow-up pipe impact operation. 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 which time the outer wall of the pipe body 1 is in close contact with the borehole side wall 10 of the goaf 3, and 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.

[0027] 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 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 charged into the airbag 5. During the gradual expansion process, the airbag 5 can evenly push the expansion sleeve 2 located outside the airbag 5 along the outer wall of the first through hole protruding from the tube body 1, and push the crushed rocks on the borehole side wall 10 of the goaf 3 by virtue of its high elasticity. Since the crushed rocks in the goaf 3 are relatively loose, some of the crushed rocks will be displaced under the push of the expansion sleeve 2. At this time, the borehole diameter of the goaf 3 is enlarged and the borehole side wall 10 of the goaf 3 is stabilized. A first space interval 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 shown in FIG. Figure 3 shown.

[0028] Step 3: Start the pressure pump, and inject the curing agent in the curing agent storage device into the first space interval through the curing agent pipeline 8 and the injection hole 4 in turn. The curing agent reacts chemically with the crushed rock and other media on the borehole side wall 10 of the goaf 3, and forms a consolidation body with a certain strength after standing for a set time, 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 side wall 10 of the goaf 3, as long as the curing agent is ensured to fully solidify after reacting with the medium on the borehole side wall 10 of the goaf 3.

[0029] In this embodiment, the curing agent is formed by mixing magnesite (MgO-MgCl2) and fly ash in a ratio of 60:40, and the fly ash may also be replaced by slag.

[0030] Step 4, open the one-way valve connected between the airbag 5 and the inflation device, discharge the compressed air in the airbag 5, and 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 the 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, increasing the depth of drilling into the goaf 3 during the follow-up pipe impact operation, and meeting the needs of comprehensive gas monitoring and efficient fire prevention and extinguishing operations in the goaf 3. The position relationship is as shown in the figure. Figure 5 shown.

[0031] Step 5: Continue the pipe impact operation and repeat steps 1 to 4 above.

[0032] The present invention uses the mutual cooperation of the pipe body 1, the air bag 5 and the expansion sleeve 2 to reduce the friction between the pipe and the side wall 10 of the borehole in the goaf 3 by applying grease or anti-friction coating on the outer wall of the follower pipe compared with the traditional method. The present invention uses the drag reduction deep drilling auxiliary device for the goaf follower pipe impact to perform the goaf 3 follower pipe impact operation, and reduces the friction between the pipe body 1 and the goaf 3 borehole by reducing the contact area between the outer wall of the pipe body 1 and the side wall 10 of the goaf 3. The effect is long-lasting and the cost is low, which greatly improves the follower pipe drilling efficiency, reduces energy consumption, and increases the drilling depth. Experiments show that the friction can be reduced by 60%-80%.

[0033] 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 special instructions 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, the connection methods between each other, and the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, 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 technologies and common knowledge in this field, and 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 according to the technical means.

[0034] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 in that: It comprises a tube body (1) placed in a goaf (3) and an axial core arranged in the tube body (1), wherein an air bag (5) is arranged between the tube body (1) and the axial core; The tube body (1) is provided with a plurality of first through holes, each of which is provided with an expansion sleeve (2), the expansion sleeve (2) being fitted with the first through hole, and the expansion sleeve (2) and the air bag (5) cooperating with each other so that the expansion sleeve (2) moves along the axial 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 reduction deep drilling auxiliary device for goaf follow-up pipe impact according to claim 1 is characterized in that: A drill bit (6) is provided on the end of the pipe body (1) that contacts the goaf (3).

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

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

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

9. The drag reduction deep drilling auxiliary device for goaf follow-up 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 as described in 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) 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), so that a first space is formed between the outer wall of the pipe body (1) and the side wall (10) of the borehole in the goaf (3); Step 3: injecting a curing agent into the first space interval, 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 gap (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.

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