Coal mine roof hydraulic fracturing safe energy absorption device and method

Abstract

The invention discloses a coal mine roof hydraulic fracturing safety energy absorption device and method, belongs to the technical field of coal mining, and solves the problems that in the hydraulic fracturing process in the prior art, a drill rod is rushed out, and personal safety of constructors is harmed. The device comprises a liquid supply pipeline, one part of the liquid supply pipeline is located in a drill hole of a top plate, and a hole is formed in the liquid supply pipeline and used for providing a passage for flowing of fracturing liquid; the hole packer is connected with the liquid supply pipeline, located on the side away from a drilling opening of the drilling hole and used for sealing a non-target fracturing area in the top plate; the anti-skid mechanism is at least connected with the liquid supply pipeline located in the drill hole, abuts against the inner wall of the drill hole and provides supporting force for the liquid supply pipeline; the energy absorption mechanism is connected with the side, away from the anti-skid mechanism, of the liquid supply pipeline, abuts against the inner wall of the top plate and is used for providing buffering force opposite to the movement direction of the liquid supply pipeline when the liquid supply pipeline rushes out. The safety in the hydraulic fracturing operation process of the top plate is improved.

Description

Technical Field

[0001] The present application belongs to the field of coal mining technology, and specifically relates to a coal mine roof hydraulic fracturing safety energy absorption device and method. Background Art

[0002] As the depth and intensity of coal mining continue to increase, the problem of coal-rock dynamic disasters has become more serious. Therefore, it is necessary to take effective technical measures to relieve pressure, reduce the risk of coal seam outbursts, and reduce the occurrence of outburst accidents. Hydraulic fracturing, as an effective pressure relief method, has been well applied in the prevention and control of coal mine dynamic disasters. For example, in coal mining, hydraulic fracturing technology is used to solve the stability problem of the roof rock layer, weaken the hard and complete roof of the coal mining face, reduce the rigidity and stress concentration of the roof, and reduce the risk of rock burst.

[0003] However, during hydraulic fracturing, high-pressure liquid is injected into the borehole through the drill pipe. If the sealing quality is poor or the pressure is too high, the liquid may flow back along the gap between the drill pipe and the hole wall, generating an outward reaction force, causing the drill pipe to be flushed out, posing a threat to the safety of construction workers. Moreover, it not only wastes fracturing fluid, but also requires repeated high-pressure fracturing, which is not energy-saving and environmentally friendly.

[0004] In this context, how to provide a technical solution to improve the safety of roof hydraulic fracturing operations has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a safe energy absorption device and method for hydraulic fracturing of a coal mine roof, so as to solve the problem in the prior art that during the hydraulic fracturing process, the drill rod may be rushed out, causing harm to the personal safety of construction workers.

[0006] The present invention provides a coal mine roof hydraulic fracturing safety energy absorption device, comprising: a fluid supply pipeline, a portion of which is located in the borehole on the top plate, and the fluid supply pipeline has holes therein for providing a passage for the fracturing fluid to flow; A hole sealer connected to the fluid supply pipeline and located at a side of the drill hole away from the borehole, used to seal a non-target fracturing area in the top plate; an anti-slip mechanism connected to at least a liquid supply pipe in the borehole, the anti-slip mechanism having a first state, and when the anti-slip mechanism is in the first state, the anti-slip mechanism contacts the inner wall of the borehole to provide a supporting force for the liquid supply pipe; An energy absorbing mechanism is connected to a side of the liquid supply pipe away from the anti-slip mechanism, and the energy absorbing mechanism is in conflict with the inner wall of the top plate. The energy absorbing mechanism is used to provide a buffering force opposite to the movement direction of the liquid supply pipe when the liquid supply pipe rushes out of the drill hole.

[0007] Optionally, the anti-slip mechanism comprises: A fixing assembly, wherein a first end of the fixing assembly is connected to a liquid supply pipeline located in the borehole and close to the drill hole, and a second end of the fixing assembly is connected to a liquid supply pipeline located outside the borehole and is in through-connection with the liquid supply pipeline; A sliding component is sleeved on the fixed component and can move along the fixed component; A support assembly, which is sleeved on the fixed assembly and located above the sliding assembly, and the support assembly is also connected to the sliding assembly; Among them, when the sliding component and the fixed component have a first relative posture, the support component is in the first state, and the support component is in conflict with the inner wall of the drill hole; when the sliding component and the fixed component have a second relative posture, the support component is in the second state.

[0008] Optionally, the coal mine roof hydraulic fracturing safety energy absorption device meets at least one or more of the following: The fixing assembly comprises: a sleeve rod, on which a control button is arranged, and a first elastic member located in the sleeve rod and linked with the control button; The sliding component includes: a sleeve, the sleeve is provided with an opening, the opening is adapted to the control button, and when the control button is fixed in the opening, the sliding component and the fixing component have the first relative posture.

[0009] Optionally, a side of the sliding component close to the supporting component has a first mounting hole, and the sliding component is connected to the supporting component through the first mounting hole.

[0010] Optionally, the support assembly comprises: A collar, sleeved on the fixing assembly; a support plate rotatably connected to the collar, the support assembly being in the first state, and the bottom of the support plate being opposite to the outer wall of the fixing assembly; a support member disposed on the support plate, wherein when the support assembly is in the first state, the support member contacts the inner wall of the borehole; A connecting piece is used to connect the support plate and the sliding assembly.

[0011] Optionally, the coal mine roof hydraulic fracturing safety energy absorption device meets one or more of the following requirements: The number of the support plates is multiple, and the multiple support plates are symmetrically arranged along the ring, and the number of the support plates on both sides is the same; The number of the support members is multiple, and the multiple support members can be arranged on one support plate, wherein the number of the support members is determined based on the total mass of the liquid supply pipeline, the depth of the borehole in the top plate, and the inclination angle of the borehole; The support member has a curved contact surface on one side away from the support plate, and the curved contact surface is adapted to the outer diameter of the fixing assembly; The angle between the support members is 90 degrees; A hinge is provided on the outer wall of the collar, and the support plate is rotatably connected to the collar through the hinge; The support plate has a second mounting hole on one side away from the support member, and the connecting member connects the support plate and the sliding assembly through the second mounting hole; The connecting member includes a connecting rod or a connecting chain.

[0012] Optionally, the coal mine roof hydraulic fracturing safety energy absorption device meets at least one or more of the following: The support member has an anti-slip member on one side away from the support plate, and when the support assembly is in the first state, the anti-slip member contacts the inner wall of the drill hole; A first limiting member is disposed on the fixing assembly and is located above the collar; A second limiting member is provided on the fixing assembly and is located between the sleeve ring and the sliding assembly; A first buffer member, which is wound around the fixing assembly and is located between the collar and the second limiting member; Wherein, the position of the second limiting member on the fixing component is determined by the position of the collar on the fixing component and the length of the first buffer member.

[0013] Optionally, the energy absorbing mechanism comprises: An anti-collision component, wherein one side of the anti-collision component has a third mounting hole, the side of the anti-collision component facing away from the third mounting hole has a third mounting hole, the side of the anti-collision component facing away from the third mounting hole has a through channel connected to the liquid supply pipeline and staggered with the third mounting hole, and an opening connected to the through channel and located inside the anti-collision component, the opening of the opening being located at the bottom of the anti-collision component; A buffer component is arranged between the anti-impact component and the inner wall of the top plate, the first end of the buffer component is connected to the mounting hole, and the second end of the buffer component is used to interfere with the inner wall of the top plate, and is used to provide the buffer force when the liquid supply pipeline is rushed out of the drilled hole, wherein the number of the buffer components is determined based on the total mass of the liquid supply pipeline, the depth of the drilled hole in the top plate, and the inclination angle of the drilled hole.

[0014] Optionally, the buffer component includes: A connecting portion connected to the third mounting hole; A main body having a hollow passage and connected to the connecting part; A second elastic member is suspended in the hollow channel; a third limiting member disposed on the main body and located below the second elastic member; a telescopic rod, wherein a first end of the telescopic rod is located above the third limiting member in the hollow channel and is capable of compressing the second elastic member; A third elastic member is wound around the telescopic rod.

[0015] Accordingly, the present invention also provides a coal mine roof hydraulic fracturing method, which is applied to the coal mine roof hydraulic fracturing safety energy absorption device described in any of the above examples, and the method comprises: Drill holes in the top plate; A fluid supply pipeline is arranged at least in the borehole, and the fluid supply pipeline has holes for providing a passage for the fracturing fluid to flow; A hole sealer is arranged on a side away from the drill hole of the borehole, the hole sealer is connected to the fluid supply pipeline and is used to seal a non-target fracturing area in the top plate; Providing an anti-slip mechanism, the anti-slip mechanism is connected to at least a liquid supply pipe located in the borehole, and the anti-slip mechanism is in a first state to contact with an inner wall of the borehole to provide a supporting force for the liquid supply pipe; An energy absorbing mechanism is provided and connected to a side of the liquid supply pipe away from the anti-slip mechanism, and the energy absorbing mechanism is in conflict with the inner wall of the top plate, and the energy absorbing mechanism is used to provide a buffer force opposite to the movement direction of the liquid supply pipe when the liquid supply pipe rushes out of the drill hole; The fracturing fluid is provided to the fluid supply pipeline through the anti-slip mechanism and the energy absorbing mechanism.

[0016] Compared with the existing solutions, in the coal mine roof hydraulic fracturing safety energy absorption device provided by the present invention, on the one hand, in the process of providing fracturing fluid to the borehole through the liquid supply pipeline, the anti-skid mechanism is at least connected to the liquid supply pipeline located in the borehole, and the anti-skid mechanism conflicts with the inner wall of the borehole, which can provide support force for the liquid supply pipeline and improve the stability of the liquid supply pipeline. Even if the sealing quality is poor or the pressure is too high, the liquid supply pipeline can still work stably, reducing the probability of recoil of the liquid supply pipeline; on the other hand, by arranging an energy absorption mechanism between the liquid supply pipeline and the inner wall of the roof, it is possible to provide a buffering force in the opposite direction of the movement of the liquid supply pipeline when the liquid supply pipeline recoils, thereby reducing the impact caused by the recoil of the liquid supply pipeline and improving the safety during the hydraulic fracturing operation of the roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings required for use in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. Figure 1 This is a schematic diagram of an application scenario of a coal mine roof hydraulic fracturing safety energy absorption device in one embodiment of the present invention; Figure 2 This is a schematic structural diagram of an anti-slip mechanism in one embodiment of the present invention; Figure 3 for Figure 2 The front structural schematic diagram of the anti-skid mechanism shown; Figure 4 for Figure 2 A partial enlarged schematic diagram of a fixed component in FIG. Figure 5 for Figure 2 A schematic diagram of the top view of the anti-slip mechanism shown; Figure 6 for Figure 2 A partial structural schematic diagram of the anti-slip mechanism shown in the second state; Figure 7 This is a schematic structural diagram of an anti-collision component in one embodiment of the present invention; Figure 8 This is a schematic structural diagram of a buffer assembly in one embodiment of the present invention; Fig. 9 The present invention is a flowchart of a coal mine roof hydraulic fracturing method according to an embodiment of the present invention.

[0018] Reference numerals: 100, liquid supply pipeline; 200, hole sealer; 300, anti-slip mechanism; 400, energy absorption mechanism; 500, top plate; 510, drilling; 600, drilling vehicle; 310, sleeve rod; 312, first elastic member; 314, control button; 316, first end of the sleeve rod; 318, second end of the sleeve rod; 320, sleeve; 322, first mounting hole; 324, opening; 330, sleeve ring; 332, support plate; 334, support member; 336, connector; 338, hinge; 340, second mounting hole; 352, first limit member; 354, second limit member; 356, first buffer member; 410, anti-collision component; 412, third mounting hole; 414, opening; 420, buffer component; 422, connector; 424, main body; 426, second elastic member; 428, third limit member; 432, telescopic rod; 434, third elastic member; 436, fitting portion. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that, in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] In the accompanying drawings, the size and relative size of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, a specific process sequence may be performed in a different order than described. For example, two successively described processes may be performed substantially simultaneously or in an order opposite to the order described. In addition, the same reference numerals represent the same components.

[0021] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0022] It should be noted that the drawings in this embodiment are schematic diagrams, which assist in explaining the concept of the present invention and schematically represent the shapes of the various parts and their mutual relationships. It should be understood that in order to clearly show the structures of the various components of the present invention, the drawings are not drawn according to the same scale, and the same reference numerals are used to represent the same parts in the drawings.

[0023] As described in the background art, during the hydraulic fracturing process, there is a problem of the drill pipe being washed out, which will endanger the personal safety of construction workers.

[0024] Therefore, in view of the above problems, in order to reduce the probability of such accidents, protect personal safety and ensure construction efficiency, a coal mine roof hydraulic fracturing safety energy absorption device is now provided. On the one hand, in the process of providing the liquid supply pipeline into the borehole through the liquid supply pipeline, the anti-skid mechanism is at least connected to the liquid supply pipeline located in the borehole, and the anti-skid mechanism conflicts with the inner wall of the borehole, which can provide support for the liquid supply pipeline and improve the stability of the liquid supply pipeline. Even if the sealing quality is poor or the pressure is too high, the liquid supply pipeline can still work stably, reducing the probability of recoil of the liquid supply pipeline; on the other hand, by arranging an energy absorption mechanism between the liquid supply pipeline and the inner wall of the roof, a buffer force opposite to the movement direction of the liquid supply pipeline can be provided when the liquid supply pipeline recoils, reducing the impact caused by the recoil of the liquid supply pipeline, improving the safety during the roof hydraulic fracturing operation, and making full use of the fracturing fluid, improving the fracturing efficiency, and achieving energy saving.

[0025] See also Figure 1 Schematic diagram of an application scenario of a coal mine roof hydraulic fracturing safety energy absorption device in one embodiment of the present invention, as shown in FIG. Figure 1 As shown, a borehole 510 is provided in the roof 500 (i.e., the rock layer or soil layer above the underground mining working face of the coal mine), and the coal mine roof hydraulic fracturing safety energy absorption device can provide fracturing fluid to the roof 500 through the borehole 510.

[0026] More specifically, the coal mine roof hydraulic fracturing safety energy absorption device may include: a liquid supply pipeline 100, a portion of which is located in a borehole 510 on a roof 500, and the liquid supply pipeline 100 has a hole (not shown) for providing a passage for the flow of fracturing fluid; a sealer 200, which is connected to the liquid supply pipeline 100 and is located on a side of the drill hole (i.e., the orifice of the drill hole) away from the drill hole 510, and is used to seal the non-target fracturing area in the roof 500; an anti-slip mechanism 300, which is at least connected to the liquid supply pipeline 100 located in the drill hole 510. The anti-skid mechanism 300 has a first state. When the anti-skid mechanism 300 is in the first state, the anti-skid mechanism 300 conflicts with the inner wall of the bore hole 510 to provide a supporting force for the liquid supply pipe 100; the energy absorbing mechanism 400 is connected to the side of the liquid supply pipe 100 away from the anti-skid mechanism 300, and the energy absorbing mechanism 400 conflicts with the inner wall of the top plate 500. The energy absorbing mechanism 400 is used to provide a buffering force opposite to the movement direction of the liquid supply pipe 100 when the liquid supply pipe 100 rushes out of the bore hole 510.

[0027] Here, “rushing out” refers to the situation where the injection pressure of the fracturing fluid is too high or the sealer 200 is damaged, which causes the fracturing fluid to flow back, thereby generating an outward force on the fluid supply pipeline 100 , causing the fluid supply pipeline 100 to detach from the borehole 510 .

[0028] In some embodiments, when hydraulic fracturing is performed, a tunnel is first established in the roof 500, and then a drilling vehicle 600 is arranged in the tunnel, and the drilling vehicle 600 is connected to the liquid supply pipeline 100. Figure 1 The drilling vehicle 600 shown is used for drilling operations, and can form a borehole 510 to be fractured in the roof 500 , and can place the fluid supply pipeline 100 in the borehole 510 .

[0029] Among them, first, the specific structure and working principle of the drilling vehicle 600 can refer to the description in the existing solution; second, the "inner wall of the top plate 500" mentioned in this solution is the "inner wall of the tunnel".

[0030] In some embodiments, when performing a drilling operation, the borehole 510 has a preset angle and a set depth, and the inner diameter of the borehole 510 is larger than the outer diameter of the liquid supply pipe 100 so that the anti-slip mechanism 300 can be set and removed at the drill opening of the borehole 510 .

[0031] The depth of the borehole 510 refers to the length of the borehole 510 in the top plate 500 along the extension direction of the liquid supply pipeline 100, and the angle may refer to the angle between the borehole 510 and the ground along the extension direction of the liquid supply pipeline 100.

[0032] In some embodiments, the liquid supply pipeline 100 is a hollow structure, and both ends of the liquid supply pipeline 100 have openings, and the fracturing fluid can be transmitted to the top plate 500 through the liquid supply pipeline 100 .

[0033] More specifically, along an extending direction parallel to the borehole 510 , a through liquid supply passage is formed between the liquid supply pipe 100 , the anti-slip mechanism 300 and the energy absorbing mechanism 400 .

[0034] In some optional embodiments, the liquid supply pipeline 100 may be a multi-section hollow steel pipe, wherein more descriptions about the liquid supply pipeline 100 may refer to the existing scheme, and this scheme does not limit the liquid supply pipeline 100.

[0035] In some embodiments, for different hydraulic fracturing application scenarios, the objects to be fractured are different, and thus different types of fracturing fluids may be provided.

[0036] More specifically, the coal mine roof hydraulic fracturing safety energy absorption device may also include: multiple liquid supply devices, one liquid supply device is used to provide a type of fracturing fluid, wherein each liquid supply device is connected to a liquid supply pipeline, and the liquid supply passages of each liquid supply device are independent of each other, so that according to the fracturing object (such as the coal seam type), at least one of the liquid supply devices can be selected to act to provide fracturing fluid suitable for the fracturing object.

[0037] In some embodiments, the coal mine roof hydraulic fracturing safety energy absorption device may also include: a processor electrically connected to each fluid supply device, wherein the processor can output a corresponding control signal to the fluid supply device adapted to the fracturing object according to the fracturing object, so as to select the transmission path between the fluid supply device and the fluid supply pipeline.

[0038] For example, a solenoid valve is provided between the liquid supply device and the liquid supply pipeline.

[0039] In some embodiments, the sealer 200 is connected to the fluid supply pipeline 100 and is located on a side of the drill hole away from the borehole 510, and can seal the non-target fracturing area in the top plate 500, wherein the non-target fracturing area refers to an area that has not been selected for hydraulic fracturing operations.

[0040] In some embodiments, the liquid supply pipeline 100 is divided into multiple sections, and the anti-slip mechanism 300 is disposed between any two sections and fixedly connected to the liquid supply pipeline 100 .

[0041] Furthermore, the anti-skid mechanism 300 can come into contact with the inner wall of the borehole 510 , so that when the fracturing operation is performed, the anti-skid mechanism 300 is embedded in the borehole 510 , which can provide support for the liquid supply pipeline 100 , thereby improving the stability of the liquid supply pipeline 100 , and thereby improving the safety during the top plate hydraulic fracturing operation.

[0042] In some embodiments, the anti-slip mechanism may include: a fixed component, a first end of which is connected to a liquid supply pipe located in the borehole and close to the drill mouth, and a second end of which is connected to a liquid supply pipe located outside the borehole and is through-connected to the liquid supply pipe; a sliding component, which is sleeved on the fixed component and can move along the fixed component; a supporting component, which is sleeved on the fixed component and is located above the sliding component, and the supporting component is also connected to the sliding component.

[0043] More specifically, the fixing assembly realizes the connection between the liquid supply pipeline and the anti-slip mechanism. In some embodiments, the connection between the fixing assembly and the liquid supply pipeline is located near the drill hole of the borehole, so that the support assembly can contact the inner wall of the borehole and facilitate the removal operation.

[0044] The sliding component can move along the fixed component. During the movement of the sliding component along the fixed component, the sliding component can also drive the supporting component to move. When the sliding component moves to one of the positions, the positions of the sliding component and the fixed component are fixed, and the relative positions no longer change. At this time, the supporting component moves and makes the supporting component conflict with the inner wall of the borehole, thereby providing sufficient support force for the liquid supply pipeline.

[0045] In other words, as the relative posture of the sliding component and the fixed component changes, the relative relationship between the support component and the inner wall of the borehole will also change, and there is one posture that causes the support component to conflict with the inner wall of the borehole.

[0046] More specifically, when the sliding component and the fixed component have a first relative posture, the support component is in the first state, and the support component is in conflict with the inner wall of the drill hole; when the sliding component and the fixed component have a second relative posture, the support component is in the second state.

[0047] The first state and the second state are different.

[0048] It should be pointed out that when the support assembly does not conflict with the inner wall of the borehole, it can be considered that the support assembly is in the second state, that is, the second state is a collection of multiple other states.

[0049] In order to better illustrate and understand the working principle and structure of the anti-slip mechanism in this solution, an example is used for explanation.

[0050] See also Figures 2 to 6 ,in, Figure 2 is a structural schematic diagram of an anti-slip mechanism in one embodiment of the present invention, Figure 3 for Figure 2 The schematic diagram of the main structure of the anti-skid mechanism shown in FIG. Figure 4 for Figure 2A partial enlarged schematic diagram of the fixed component in FIG. Figure 5 for Figure 2 The schematic diagram of the top view of the anti-slip mechanism shown in FIG. Figure 6 for Figure 2 A schematic diagram of the partial structure of the anti-slip mechanism shown in the second state.

[0051] See also Figures 2 to 6 The fixing assembly may include: a sleeve rod 310 , a control button 314 is provided on the sleeve rod 310 , and a first elastic member 312 located in the sleeve rod 310 and linked with the control button 314 .

[0052] Correspondingly, the sliding component may include: a sleeve 320, on which an opening 324 is provided, the opening 324 is adapted to the control button 314, and when the control button 314 is fixed in the opening 324, the sliding component and the fixing component have the first relative posture.

[0053] Specifically, the sleeve 320 is sleeved on the outer wall of the sleeve rod 310 and can move up and down along the sleeve rod 310. During the movement of the sleeve 320, the control button 314 can move with the first elastic member 312, and the control button 314 can be nested in the opening 324. Under the interaction between the control button 314, the opening 324 and the first elastic member 312, the sleeve 320 no longer moves, and the sliding component and the fixed component have a first relative posture.

[0054] In some embodiments, the first end 316 of the sleeve rod has a first mounting port, an inner wall of the first mounting port is provided with an internal thread, and an outer wall of the liquid supply pipe 100 has an external thread, and the connection between the first end 316 of the sleeve rod and the liquid supply pipe 100 is achieved through a threaded connection scheme.

[0055] Similarly, the second end 318 of the sleeve rod has a second mounting port, the inner wall of the second mounting port is provided with an internal thread, and the outer wall of the liquid supply pipe 100 has an external thread. The connection between the second end 318 of the sleeve rod and the liquid supply pipe 100 is achieved through a threaded connection scheme.

[0056] The threaded connection is simple to operate and allows for quick removal and installation of the anti-slip mechanism.

[0057] It should be pointed out that the above-mentioned connection method between the sleeve rod 310 and the liquid supply pipe 100 is only an example. In some other embodiments, they can also be connected by bolts.

[0058] In some embodiments, the inner diameter of the sleeve 320 is the same as the outer diameter of the sleeve rod 310, and the sleeve 320 can be inserted into the outer wall of the sleeve rod 310, so that the sleeve 320 can move along the sleeve rod 310 to change the state of the support assembly.

[0059] In some embodiments, when the control button 314 is nested in the opening 324, and because the control button 314 is clamped by the opening 324 and the first elastic member 312 is in a stretched state, the phase position between the sleeve 320 and the sleeve rod 310 can be maintained when the control button 314 is not touched.

[0060] Correspondingly, when the control button 314 is pressed, the sleeve 320 is no longer restricted by the first elastic member 312, thereby driving the sleeve 320 to move in the opposite direction, thereby changing the state of the support assembly so that the support assembly no longer contacts the inner wall of the borehole.

[0061] In some examples, the first elastic member 312 may be a spring. In some other embodiments, the first elastic member may also be a rubber member.

[0062] By using the fixed component and the sliding component having the above-mentioned functional relationship, the state of the supporting component can be adjusted in real time, and the interference state between the supporting component and the drilling hole can be changed to adapt to different work processes.

[0063] In some embodiments, a first mounting hole 322 is formed on a side of the sliding assembly close to the supporting assembly, and the sliding assembly is connected to the supporting assembly through the first mounting hole 322 .

[0064] More specifically, the first mounting hole 322 is disposed on a side of the sleeve 320 that is close to and away from the control button 314 .

[0065] Since the sliding assembly is connected to the supporting assembly through the first mounting hole 322, on the one hand, when the sleeve 320 is not in motion, under the action of the supporting assembly, the sleeve 320 will not slide off the sleeve rod 310, and when the sleeve 320 is in motion, the supporting assembly can be driven to move through the first mounting hole 322, so that the supporting assembly contacts the inner wall of the drilled hole.

[0066] In other words, through the first mounting hole, the interaction mode between the sliding component and the supporting component is changed in different states, thereby improving the stability of the anti-slip structure.

[0067] In some embodiments, the support assembly can be fixed to the first mounting hole 322 by means of screws.

[0068] In some embodiments, the support assembly may include: a ring 330, which is sleeved on the fixed assembly; a support plate 332, which is rotatably connected to the ring 330, and the support assembly is in the first state, and the bottom of the support plate 332 is opposite to the outer wall of the fixed assembly; a support member 334, which is arranged on the support plate 332, and when the support assembly is in the first state, the support member 334 is in conflict with the inner wall of the borehole 510; a connecting member 336, which is used to connect the support plate 332 and the sliding assembly.

[0069] In some embodiments, the inner diameter of the collar 330 is the same as the outer diameter of the sleeve rod 310 , and the collar 330 can be inserted into the sleeve rod 310 so that the collar 330 can move along the sleeve rod 310 .

[0070] In some embodiments, the collar 330 is located on the sleeve 320, so that when the sleeve 320 is in motion, it can drive the collar 330 to move.

[0071] In some embodiments, the support plate 332 is rotatably connected to the ring 330, so that the support plate 332 can rotate 180° along the connection between the support plate 332 and the ring 330, which expands the movement range of the support plate 332 and enables the support plate 332 to rotate to a maximum angle and remain at the maximum angle when the bottom of the support plate 332 is toward the outer wall of the sleeve rod 310, so that the support member 334 can always be in contact with the inner wall of the borehole 510.

[0072] In some embodiments, the connector 336 realizes the connection between the support plate 332 and the sliding assembly. When the sliding assembly moves, it can drive the connector 336 to move, and the other end of the connector 336 is connected to the support plate 332, thereby driving the support plate 332 to rotate.

[0073] And from the above content, it can be known that when the control button 314 is nested in the opening 324, the position of the sliding component is fixed, and the support plate 332 is rotated to the maximum angle and remains unchanged, so that the support member 334 can always conflict with the inner wall of the drill hole 510.

[0074] In some embodiments, the connecting member 336 has a certain degree of expansibility, and when the position of the sliding assembly is fixed, it can enable the support plate 332 to rotate to a maximum angle and remain unchanged.

[0075] In some optional embodiments, the connecting member 336 may include a connecting rod or a connecting chain.

[0076] In some embodiments, the greater the number of support members, the larger the contact area between the anti-slip mechanism and the inner wall of the borehole, thereby being able to provide a greater supporting force.

[0077] Based on this, in some embodiments, there are multiple support plates 332, and the multiple support plates 332 are symmetrically arranged along the ring 330, and the number of support plates 332 on both sides is the same.

[0078] Among them, this solution only shows two support plates 332 , and a support member 334 is disposed on one support plate 332 .

[0079] By providing multiple support plates 332, the number of support members 334 can be increased, thereby increasing the contact area with the inner wall of the borehole and providing greater supporting force; and by symmetrically arranging the support plates 332 along the ring 330, the supporting force provided can be more evenly distributed.

[0080] In other words, the supporting components are symmetrically arranged along the central axis of the fixing component.

[0081] In some embodiments, there may be multiple support members, and multiple support members can be disposed on one support plate.

[0082] In other words, by increasing the number of support members on the support plate, it is also possible to provide a greater supporting force.

[0083] In some embodiments, the number of supports is based on the total mass of the liquid supply pipeline 100, the depth L of the borehole 510 in the top plate 500, and the inclination angle of the borehole 510. Sure.

[0084] More specifically, first, according to the depth L, the inner diameter and the outer diameter of the liquid supply pipe 100, the total weight M of the liquid supply pipe 100 in the borehole 510 is determined:

[0085] in, d 1 is the outer diameter of the liquid supply pipe 100, m; d 2 is the inner diameter of the liquid supply pipeline 100, m; is the density of the material of the liquid supply pipe 100, kg / m 3 .

[0086] In an optional embodiment, if the material of the liquid supply pipe 100 is steel, 7850kg / m 3 .

[0087] Secondly, according to the total weight M of the liquid supply pipeline 100, the inclination angle of the borehole 510 , calculate the limit sliding force F of the liquid supply pipeline 100;

[0088] Wherein, M is the total weight of the liquid supply pipeline, in kg; g is the acceleration due to gravity, in m / s²; k 1 is the friction coefficient; k 2 is the expansion coefficient of the impact fracturing fluid when providing the fracturing fluid; is the inclination angle of the borehole 510, in °; L is the depth of the borehole 510 in the roof, in m.

[0089] In an alternative embodiment, 0 < k 1 ≤ 1; k 2 is generally 1.0 to 1.5, g = 9.8 m / s².

[0090] Furthermore, according to the calculated ultimate sliding force and the set sliding force, determine the number of support members: If 0 < F ≤ 25 KN, the anti-slip mechanism is provided with 1 set of support members (i.e., 2 support members); if 25 < F ≤ 50 KN, the anti-slip mechanism is provided with 2 sets of support legs (i.e., 4 support members); if 50 < F ≤ 75 KN, the anti-slip mechanism is provided with 3 sets of support legs (i.e., 6 support members).

[0091] In a specific embodiment, if the hydraulic fracturing technology is used for roof pressure relief, the outer diameter of the liquid supply pipeline used for hydraulic fracturing is 73 mm, the inner diameter is 53 mm, the borehole inclination angle is 30°, and the borehole depth is 150 m. According to the above design scheme, M = 2329.3 kg.

[0092] If k 1 is 0.6, k 2 is 1.2, then F = 8.22 KN < 25 KN, and the anti-slip mechanism is provided with 1 set of support members.

[0093] In some embodiments, the angle between the support plate 332 and the support member 334 is 90 degrees. In this way, when the support plate 332 rotates to the maximum angle and remains unchanged, the contact area between the support member 334 and the inner wall of the borehole 510 is the largest, and a greater support force can be provided under the condition that other parameters are the same.

[0094] In some embodiments, the support member 334 has an arc-shaped contact surface 335 on one side of the surface away from the support plate 332, and the arc-shaped contact surface 335 is adapted to the outer diameter of the fixing component (e.g., the sleeve rod 310). In this way, when backflow occurs, on the one hand, the contact area between the support member 334 and the inner wall of the borehole 510 is reduced, thereby reducing the impact on the support member 334; on the other hand, when the anti-slip structure 300 is removed, the arc-shaped contact surface 335 can be made opposite to the sleeve rod 310 by moving the support plate 332, thereby reducing the overall volume of the anti-slip structure and facilitating its removal from the borehole 510.

[0095] This is because: if the top of the support member 334 is in other shapes (such as a square), during the retraction process of the anti-slip structure, the two ends of the support member 334 are against the sleeve rod 310, and there is an area protruding from the sleeve rod 310. Due to the existence of this area, the anti-slip mechanism still has a large width and is not easy to be removed from the drilled hole.

[0096] In other words, the side of the support member 334 away from the surface of the support plate 332 is an arc-shaped opening, and the diameter of the arc-shaped opening is the same as the outer diameter of the sleeve rod 310. When the support mechanism is retracted, the support member 334 can fit with the outer wall of the sleeve rod 310 to reduce the volume of the anti-slip mechanism.

[0097] In some embodiments, a hinge 338 is provided on the outer wall of the collar 330 , and the support plate 332 is rotatably connected to the collar 330 via the hinge 338 .

[0098] In an optional embodiment, the hinge 338 may be a hinge, wherein the structure and working principle of the hinge may refer to the description in the existing solution, and this solution does not impose any limitation on this.

[0099] In some embodiments, a side of the support plate 332 away from the support member 334 has a second mounting hole 340 , and the connecting member 336 connects the support plate 332 and the sliding assembly through the second mounting hole 340 .

[0100] In some embodiments, the connection member 336 can be fixed to the first mounting hole 322 by means of screws to achieve connection between the connection member 336 and the support plate 332 .

[0101] In some embodiments, the support member 334 has an anti-slip member on one side away from the support plate 332 , and when the support assembly is in the first state, the anti-slip member contacts the inner wall of the bore 510 .

[0102] By providing the anti-skid piece, the friction between the support piece 334 and the borehole 510 is increased, so that the anti-skid mechanism can be better fixed in the original position, and the position of the liquid supply pipeline 100 is relatively fixed, so as to further improve safety. The anti-skid piece can be rubber.

[0103] In some embodiments, the coal mine roof hydraulic fracturing safety energy absorption device may further include: a first limiter 352 , which is disposed on the fixing assembly and located above the collar 330 .

[0104] More specifically, the first stopper 352 is disposed on the outer wall of the sleeve rod 310 and is located above the collar 330 , which can prevent the collar 330 from being separated from the sleeve rod 310 , thereby enhancing the working stability of the anti-slip mechanism.

[0105] In an optional embodiment, the first limiting member 352 may be a limiting block protruding from the sleeve rod 310 .

[0106] In some embodiments, the coal mine roof hydraulic fracturing safety energy absorption device may further include a second limiter 354, which is disposed on the fixing assembly and located between the collar 330 and the sliding assembly.

[0107] More specifically, the second limiting member 354 is disposed on the outer wall of the sleeve rod 310 and is located between the sleeve ring 330 and the sleeve 320 to limit the movement range of the sleeve ring 330 to further enhance the working stability of the anti-slip mechanism.

[0108] In an optional embodiment, the second limiting member 354 may be a limiting block protruding from the sleeve rod 310 .

[0109] In some embodiments, taking into account the possible damage to the support assembly (more specifically the collar 330 ) along the sleeve rod 310 , the coal mine roof hydraulic fracturing safety energy absorption device may also include a first buffer member 356 , which is wrapped around the fixed assembly and located between the collar 330 and the second limit member 354 .

[0110] More specifically, the first buffer member 356 is wrapped around the outer wall of the sleeve rod 310 and between the ring 330 and the second limit member 354. When the ring 330 moves along the sleeve rod 310, the first buffer member 356 can play a buffering and protective role to reduce damage to the ring 330.

[0111] In some embodiments, if the coal mine roof hydraulic fracturing safety energy absorption device includes both a second limit member 354 and a first buffer member 356, the second limit member 354 limits the first buffer member 356 from continuing to move downward, and the position of the second limit member 354 on the fixed assembly is determined by the position of the ring 330 on the fixed assembly and the length of the first buffer member 356.

[0112] In an optional embodiment, the first buffer member 356 is a spring.

[0113] In some embodiments, a recessed portion protruding inward is provided on the outer wall of the sleeve rod, and the outer wall of the sleeve rod is between adjacent recessed portions; a clamping portion is engaged with the recessed portion to limit the movement of the ring, wherein the clamping portion includes: a main body, which is arranged along the circumference of the sleeve rod, and the main body has an opening; a clamping piece is arranged in the opening and connected to the main body, and the clamping piece is in contact with the recessed portion.

[0114] In other words, through the cooperation between the clamping part and the recessed part, when the sleeve 320 drives the ring 330 to move so that the support member 334 conflicts with the inner wall of the drill hole, the ring 330 pushes the clamping part to move, and the clamping part and the recessed part are clamped together. When the clamping part reaches one of the recessed parts, the buffering and limiting effects are achieved, thereby replacing the second limiting part and the first buffering part.

[0115] In some embodiments, when the anti-slip mechanism is in the initial state, the control button 314 is not locked in the opening 324 , and the support member 334 does not interfere with the inner wall of the bore 510 .

[0116] When the anti-slip mechanism is in working state, the sleeve 320 is driven to move toward the position of the control button 314. The sleeve 320 drives the bottom of the support plate 332 to move toward the sleeve rod 310 through the connecting member 336. During this process, the support member 334 gradually approaches the inner wall of the borehole 510.

[0117] When the opening 324 on the sleeve 320 moves to the control button 314, the control button 314 is fixed at the opening 324, and the sleeve 320 no longer moves. At this time, the support plate 332 rotates to the maximum angle and remains unchanged, so that the support member 334 can always contact the inner wall of the drill hole 510, thereby achieving snap connection.

[0118] When the anti-slip mechanism needs to be removed, the control button 314 is pressed, and the sleeve 320 moves toward the side away from the control button 314, so that the support member 334 does not conflict with the inner wall of the bore 510, and the anti-slip mechanism can be removed.

[0119] In some embodiments, the inventors further discovered that if the reverse impact force is large, there is a possibility that the anti-slip mechanism will fail and the liquid supply pipe will rush out of the drill hole.

[0120] In this embodiment, one side of the energy absorbing mechanism 400 is in contact with the inner wall of the top plate 500, and the position of the energy absorbing mechanism 400 is relatively fixed. When the liquid supply pipe 100 rushes out of the borehole (i.e., rushes out) and contacts the energy absorbing mechanism 400, the energy absorbing mechanism 400 can provide a buffer force opposite to the movement direction of the liquid supply pipe 100, reducing the impact caused by the rushing out of the liquid supply pipe 100, so as to further improve the safety during the hydraulic fracturing operation.

[0121] In some embodiments, the energy absorbing mechanism 400 may be in communication with the liquid supply pipeline 100 through the drilling vehicle 600 .

[0122] In some embodiments, there is a connecting rod mechanism between the energy absorption mechanism 400 and the anti-slip mechanism 300, and the two ends of the connecting rod are respectively connected to the energy absorption mechanism 400 and the anti-slip mechanism 300. When the support rod in the anti-slip mechanism 300 slides, the connecting rod mechanism will pull or push the starting mechanism of the energy absorption mechanism 400, so that the energy absorption mechanism 400 will move in advance.

[0123] In short, the linkage between the energy absorption mechanism 400 and the anti-slip mechanism 300 can further improve the safety during the hydraulic fracturing operation.

[0124] In some embodiments, see Figure 7 and Figure 8 The schematic diagram of the structure of the energy absorbing mechanism in one embodiment of the present invention is shown, the energy absorbing mechanism 400 may include: an anti-collision component 410, one side of the anti-collision component 410 has a third mounting hole 412, the side of the anti-collision component 410 facing away from the third mounting hole 412 has a through channel (not shown in the figure) connected to the liquid supply pipeline 100 and staggered with the third mounting hole 412, and an opening 414 connected to the through channel and located inside the anti-collision component 410, and the orifice of the opening 414 is located at the bottom of the anti-collision component 410.

[0125] More specifically, the anti-collision component 410 is a metal block, and six third mounting holes 412 are arranged on one side of the metal block, and the third mounting holes 412 are arranged in a 3×2 pattern. The third mounting holes 412 have thread structures inside to connect with the buffer component 420 .

[0126] A through channel is provided on one side of the anti-impact component 410 facing the liquid supply pipeline 100 . The through channel is provided based on the inclination of the liquid supply pipeline 100 , and has threads therein so as to be connected to the liquid supply pipeline 100 .

[0127] The bottom of the anti-impact component 410 has an opening 414 of a certain depth, and the opening 414 is connected to the through passage. Figure 1The water pipe protruding from the energy absorption mechanism 400 as shown is connected to the opening 414 of the anti-impact component 410, and the fracturing fluid is transported through the through-channel inside the anti-impact component 410.

[0128] In some embodiments, a hydraulically adjustable lifting foot is designed at the bottom of the anti-impact component 410 to better adapt to the actual working conditions and facilitate the connection with the liquid supply steel pipe.

[0129] The buffer component 420 is arranged between the inner walls of the anti-impact component 410 and the top plate 500. The first end of the buffer component 420 is connected to the third mounting hole 412, and the second end of the buffer component 420 is used to abut against the inner wall of the top plate 500 to provide the buffer force when the liquid supply pipeline 100 rushes out from the drilling hole 510. Among them, the number of the buffer components 420 is determined based on the total mass of the liquid supply pipeline 100, the depth L of the drilling hole 510 in the top plate, and the inclination angle of the drilling hole. Determined.

[0130] Among them, for the determination method of the buffer component 420, reference can be made to the description of the foregoing examples.

[0131] More specifically, if 0 < F ≤ 50 KN, 2 buffer components 420 are provided; if 50 < F ≤ 75 KN, 4 buffer components 420 are provided; if 75 < F ≤ 100 KN, 6 buffer components 420 are provided.

[0132] In some embodiments, the buffer component 420 may include: a connection part 422 connected to the third mounting hole 412; a main body part 424 having a hollow channel and connected to the connection part 422; a second elastic member 426 suspended in the hollow channel; a third limiting member 428 arranged on the inner wall of the main body part 424 and located below the second elastic member 426; a telescopic rod 432, the first end of the telescopic rod 432 is located above the third limiting member 428 in the hollow channel and can compress the second elastic member 426; a third elastic member 434 wound around the telescopic rod 432.

[0133] Specifically, when the liquid supply pipeline 100 rushes out, the energy absorption mechanism 400 and the liquid supply pipeline 100 are connected together. Under the action of the mutual force, since the second end of the telescopic rod 432 contacts the inner wall of the top plate 500, the telescopic rod 432 will move toward the side away from the inner wall of the top plate 500. Since a part of the telescopic rod 432 is located inside the main body part 424, the compression of the second elastic member 426 can be realized.

[0134] At the same time, the third elastic member 434 on the telescopic rod 432 will move with the telescopic rod 432. When the third elastic member 434 is continuously compressed until it contacts the third limiting member 428, energy offset is achieved.

[0135] In some embodiments, one end of the third elastic member 434 is connected to the telescopic rod 432 , and the other end of the third elastic member 434 is connected to the third limiting member 428 .

[0136] In some embodiments, the third elastic member 434 may be a spring. In some other embodiments, the third elastic member may also be a rubber member.

[0137] In some embodiments, the third limiting member 428 may be a limiting block protruding from the inner wall of the main body 424 .

[0138] In some embodiments, the second end of the telescopic rod 432 is further provided with a fitting portion 436. By providing the fitting portion 436, the contact area between the telescopic rod 432 and the inner wall of the top plate 500 is increased, and the working stability of the telescopic rod 432 is further improved. The fitting portion 436 can be rubber.

[0139] In summary, by providing an anti-slip mechanism and / or an energy absorption mechanism, the safety during hydraulic fracturing operations can be improved.

[0140] The present invention also provides a coal mine roof hydraulic fracturing method, using the coal mine roof hydraulic fracturing safety energy absorption device described in any of the above examples, the operation process of the coal mine roof hydraulic fracturing method is as follows: Fig. 9 The coal mine roof hydraulic fracturing method includes the following steps: S10, drilling holes in the top plate.

[0141] Among them, the specific method of drilling can refer to the description of the existing solution. The focus of this application is to improve the safety of the operation by setting up an anti-slip mechanism and an energy absorption mechanism.

[0142] S20, at least a fluid supply pipeline is arranged in the borehole, wherein the fluid supply pipeline has holes for providing a passage for the fracturing fluid to flow.

[0143] The liquid supply pipeline is a hollow structure, and both ends of the liquid supply pipeline have openings, through which the fracturing fluid can be transmitted to the top plate.

[0144] S30, a hole sealer is arranged on a side away from the drill hole of the borehole, wherein the hole sealer is connected to the fluid supply pipeline and is used to seal a non-target fracturing area in the top plate.

[0145] S40, providing an anti-skid mechanism, wherein the anti-skid mechanism is connected to at least the liquid supply pipe in the borehole, and the anti-skid mechanism is placed in a first state to contact the inner wall of the borehole to provide support for the liquid supply pipe.

[0146] The anti-slip mechanism may be any of the anti-slip mechanisms described in the above examples.

[0147] In some embodiments, the liquid supply steel pipe is connected to the hole sealer, and an anti-slip mechanism is installed when the liquid supply steel pipe is connected to the vicinity of the borehole opening, so that the anti-slip mechanism can grab the hole wall when it is opened near the borehole opening, preventing the liquid supply steel pipe from vibrating or displacing, thereby providing an anti-slip function.

[0148] In some embodiments, step S40 may specifically include: connecting the first end of the fixed component to the liquid supply pipe located in the borehole, and connecting the second end of the fixed component to the liquid supply pipe located outside the borehole, so that the fixed component and the liquid supply pipe are connected; driving the sliding component to move along the fixed component, so that the sliding component and the fixed component have a first relative posture, so that the supporting component connected to the sliding component is in conflict with the inner wall of the borehole.

[0149] The fixing assembly realizes the connection between the liquid supply pipeline and the anti-slip mechanism. In some embodiments, the connection between the fixing assembly and the liquid supply pipeline is located near the drill hole of the borehole, so that the support assembly can interfere with the inner wall of the borehole.

[0150] The sliding component can move along the fixed component. During the movement of the sliding component along the fixed component, the sliding component can also drive the supporting component to move. When the sliding component moves to one of the positions, the positions of the sliding component and the fixed component are fixed, and the relative positions no longer change. At this time, the supporting component moves, and the supporting component is in conflict with the inner wall of the borehole, thereby providing sufficient support force for the liquid supply pipeline.

[0151] In other words, as the relative posture of the sliding component and the fixed component changes, the relative relationship between the support component and the inner wall of the borehole will also change, and there is one posture that causes the support component to conflict with the inner wall of the borehole.

[0152] S50, providing an energy absorbing mechanism and connecting it to a side of the liquid supply pipe away from the anti-slip mechanism, and making the energy absorbing mechanism conflict with the inner wall of the top plate, wherein the energy absorbing mechanism is used to provide a buffering force opposite to the movement direction of the liquid supply pipe when the liquid supply pipe rushes out of the drill hole.

[0153] The energy absorbing mechanism may be any of the energy absorbing mechanisms described in the foregoing examples.

[0154] S60, providing the fracturing fluid to the fluid supply pipeline through the anti-slip mechanism and the energy absorbing mechanism.

[0155] In some embodiments, the anti-skid mechanism and the energy absorbing mechanism are connected through the liquid supply pipeline, and fracturing fluid can be provided to the liquid supply pipeline through the anti-skid mechanism and the energy absorbing mechanism.

[0156] In other words, the anti-slip mechanism and the energy absorbing mechanism can be used as a part of the liquid supply pipeline.

[0157] In some embodiments, the step of driving the sliding component to move along the fixing component so that the sliding component and the fixing component have a first relative posture includes: The support plate 332 is rotatably connected to the collar 330 , a second mounting hole 340 is provided on a side of the support plate 332 facing the fixing assembly, and a support member 334 is provided on the support plate 332 .

[0158] The sleeve ring 330 is sleeved on the sleeve rod 310 , and the sleeve rod 310 is provided with a control button 314 . A first elastic member 312 that cooperates with the control button 314 is provided inside the sleeve rod 310 .

[0159] The sleeve 320 is sleeved on the sleeve rod 310 , and the sleeve 320 is located below the sleeve rod 310 . A first mounting hole 322 is set on one side of the sleeve 320 close to the sleeve rod 310 , and an opening 324 is provided on the sleeve 320 , and the opening 324 is located below the first mounting hole 322 .

[0160] The sleeve 320 and the support plate 332 are connected via a connecting piece 336 .

[0161] The sleeve 320 is driven to move along the sleeve rod 310 until the control button 314 is fixed in the opening 324 and the support member 334 contacts the inner wall of the bore 510 .

[0162] In some optional embodiments, if the coal mine roof hydraulic fracturing safety energy absorption device further includes an energy absorption mechanism, the coal mine roof hydraulic fracturing method may further include: The energy absorbing mechanism is installed, including: determining the interface angle of the anti-impact component, the interface angle is determined based on the inclination angle of the drill hole and the tunnel conditions; installing the buffer component on the side of the anti-impact component close to the tunnel wall, the buffer components need to be arranged symmetrically, and the number of the buffer components is determined based on the total mass of the liquid supply pipeline, the depth of the drill hole in the top plate, and the inclination angle of the drill hole; connecting the liquid supply steel pipe to the anti-impact component, and making the buffer component against the tunnel wall.

[0163] In some optional embodiments, when the anti-slip mechanism needs to be removed, the control button is triggered, and the sleeve 320 slides upward along the sleeve rod 310 , so that the support member 334 is loosened and separated from the inner wall of the bore 510 .

[0164] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A coal mine roof hydraulic fracturing safety energy absorption device, characterized in that: include: a fluid supply pipeline, a portion of which is located in the borehole on the top plate, and the fluid supply pipeline has holes therein for providing a passage for the fracturing fluid to flow; A hole sealer connected to the fluid supply pipeline and located at a side of the drill hole away from the borehole, used to seal a non-target fracturing area in the top plate; an anti-slip mechanism connected to at least a liquid supply pipe in the borehole, the anti-slip mechanism having a first state, and when the anti-slip mechanism is in the first state, the anti-slip mechanism contacts the inner wall of the borehole to provide a supporting force for the liquid supply pipe; An energy absorbing mechanism is connected to a side of the liquid supply pipe away from the anti-slip mechanism, and the energy absorbing mechanism is in conflict with the inner wall of the top plate. The energy absorbing mechanism is used to provide a buffering force opposite to the movement direction of the liquid supply pipe when the liquid supply pipe rushes out of the drill hole.

2. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 1, characterized in that: The anti-slip mechanism comprises: A fixing assembly, wherein a first end of the fixing assembly is connected to a liquid supply pipeline located in the borehole and close to the drill hole, and a second end of the fixing assembly is connected to a liquid supply pipeline located outside the borehole and is in through-connection with the liquid supply pipeline; A sliding component is sleeved on the fixed component and can move along the fixed component; A support assembly, which is sleeved on the fixed assembly and located above the sliding assembly, and the support assembly is also connected to the sliding assembly; Among them, when the sliding component and the fixed component have a first relative posture, the support component is in the first state, and the support component is in conflict with the inner wall of the drill hole; when the sliding component and the fixed component have a second relative posture, the support component is in a second state, and the first state and the second state are different.

3. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 2, characterized in that: Satisfy at least one or more of the following: The fixing assembly comprises: a sleeve rod, on which a control button is arranged, and a first elastic member located in the sleeve rod and linked with the control button; The sliding component includes: a sleeve, the sleeve is provided with an opening, the opening is adapted to the control button, and when the control button is fixed in the opening, the sliding component and the fixing component have the first relative posture.

4. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 3, characterized in that: The sliding component has a first mounting hole on one side close to the supporting component, and the sliding component is connected to the supporting component through the first mounting hole.

5. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 2, characterized in that: The support assembly comprises: A collar, sleeved on the fixing assembly; a support plate rotatably connected to the collar, the support assembly being in the first state, and the bottom of the support plate being opposite to the outer wall of the fixing assembly; a support member disposed on the support plate, wherein when the support assembly is in the first state, the support member contacts the inner wall of the borehole; A connecting piece is used to connect the support plate and the sliding assembly.

6. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 5, characterized in that: Meet one or more of the following: The number of the support plates is multiple, and the multiple support plates are symmetrically arranged along the ring, and the number of the support plates on both sides is the same; The number of the support members is multiple, and the multiple support members can be arranged on one support plate, wherein the number of the support members is determined based on the total mass of the liquid supply pipeline, the depth of the borehole in the top plate, and the inclination angle of the borehole; The support member has a curved contact surface on one side away from the support plate, and the curved contact surface is adapted to the outer diameter of the fixing assembly; The angle between the support members is 90 degrees; A hinge is provided on the outer wall of the collar, and the support plate is rotatably connected to the collar through the hinge; The support plate has a second mounting hole on one side away from the support member, and the connecting member connects the support plate and the sliding assembly through the second mounting hole; The connecting member includes a connecting rod or a connecting chain.

7. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 5, characterized in that: Satisfy at least one or more of the following: The support member has an anti-slip member on one side away from the support plate, and when the support assembly is in the first state, the anti-slip member contacts the inner wall of the drill hole; A first limiting member is arranged on the fixing assembly and is located above the collar; A second limiting member is provided on the fixing assembly and is located between the sleeve ring and the sliding assembly; A first buffer member, which is wound around the fixing assembly and is located between the collar and the second limiting member; Wherein, the position of the second limiting member on the fixing component is determined by the position of the collar on the fixing component and the length of the first buffer member.

8. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 1, characterized in that: The energy absorbing mechanism comprises: An anti-collision component, wherein one side of the anti-collision component has a third mounting hole, and the side of the anti-collision component facing away from the third mounting hole has a through channel connected to the liquid supply pipeline and staggered with the third mounting hole, and an opening connected to the through channel and located inside the anti-collision component, wherein the opening is located at the bottom of the anti-collision component; A buffer assembly is arranged between the anti-impact assembly and the inner wall of the top plate, the first end of the buffer assembly is connected to the third mounting hole, and the second end of the buffer assembly is used to interfere with the inner wall of the top plate, and is used to provide the buffer force when the liquid supply pipeline is rushed out of the drilled hole, wherein the number of the buffer assemblies is determined based on the total mass of the liquid supply pipeline, the depth of the drilled hole in the top plate, and the inclination angle of the drilled hole.

9. The coal mine roof hydraulic fracturing safety energy absorption device according to claim 8, characterized in that: The buffer assembly comprises: A connecting portion connected to the third mounting hole; A main body having a hollow passage and connected to the connecting part; A second elastic member is suspended in the hollow channel; a third limiting member disposed on the main body and located below the second elastic member; a telescopic rod, wherein a first end of the telescopic rod is located above the third limiting member in the hollow channel and is capable of compressing the second elastic member; A third elastic member is wound around the telescopic rod.

10. A coal mine roof hydraulic fracturing method, applied to the coal mine roof hydraulic fracturing safety energy absorption device according to any one of claims 1 to 9, characterized in that: Hydraulic fracturing methods include: Drill holes in the top plate; A fluid supply pipeline is arranged at least in the borehole, and the fluid supply pipeline has holes for providing a passage for the fracturing fluid to flow; A hole sealer is arranged on a side away from the drill hole of the borehole, the hole sealer is connected to the fluid supply pipeline and is used to seal a non-target fracturing area in the top plate; Providing an anti-slip mechanism, wherein the anti-slip mechanism is at least connected to the liquid supply pipe located in the borehole, and the anti-slip mechanism is in the first state to contact the inner wall of the borehole to provide support force for the liquid supply pipe; An energy absorbing mechanism is provided and connected to a side of the liquid supply pipe away from the anti-slip mechanism, and the energy absorbing mechanism is in conflict with the inner wall of the top plate, and the energy absorbing mechanism is used to provide a buffer force opposite to the movement direction of the liquid supply pipe when the liquid supply pipe rushes out of the drill hole; The fracturing fluid is provided to the fluid supply pipeline through the anti-slip mechanism and the energy absorbing mechanism.

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