Water diversion fracture plugging method and equipment

Abstract

The application provides a water-guided fracture sealing method, which comprises the following steps: controlling a drill bit to drill to a preset sealing position. A pressure device is used to pressurize jet flow liquid, so that the jet flow liquid breaks the surrounding rock of the sealing position, and a sealing space is formed. A refrigerant is injected into the sealing space, so that the jet flow liquid is cooled below the melting point. Cement mortar is injected into the sealing space until all the jet flow liquid in the sealing space is replaced by the cement mortar. According to the application, a borehole is drilled, the jet flow liquid is broken at the preset sealing position, the sealing space is formed, the jet flow liquid is cooled by the refrigerant, the jet flow liquid is solidified and expanded, the surrounding rock of the sealing space is extruded, the water-guided fracture is extruded and closed, and thus the water-guided fracture is sealed. Finally, the sealing space is fixed by grouting into the sealing space, and thus the unexposed water-guided fracture is sealed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stratum grouting, in particular to a water-fissure plugging method and equipment. BACKGROUND

[0002] Grouting is an effective method to improve the structure of surrounding rock and the mechanical properties of rock mass, significantly improve the strength and permeability resistance of broken rock mass, and can improve the safety of underground engineering. It has been widely used in the development and utilization of underground space such as mining and tunnel. In practice, the success of grouting depends on whether the water-fissure can be completely plugged, but the existing grouting technology can only plug the exposed fissures, and often fails to achieve the desired effect on unexposed fissures. SUMMARY

[0003] Therefore, the present application aims to provide a water-fissure plugging method and equipment.

[0004] To achieve the above purpose, the present application provides a water-fissure plugging method, which comprises: controlling a drill bit to excavate to a preset plugging position. A pressure device is used to pressurize a jet flow liquid, so that the jet flow liquid breaks the surrounding rock of the plugging position to form a plugging space. The jet flow liquid mixes with the broken rock in the plugging space. A refrigerant is injected into the plugging space to cool the jet flow liquid below the melting point. Cement mortar is injected into the plugging space until all the jet flow liquid in the plugging space is replaced by the cement mortar.

[0005] In some embodiments, the control of the drill bit to excavate to the preset plugging position specifically comprises: opening a vertical section borehole at the preset borehole position until the borehole depth reaches the preset excavation depth. The drill bit is controlled to deflect along a preset deflecting trajectory until the excavation direction of the drill bit points to the plugging position. The drill bit is controlled to excavate to the plugging position along the deflecting direction.

[0006] In some embodiments, after the borehole depth reaches the preset excavation depth, the method further comprises: installing a casing in the borehole and fixing the casing. The outer diameter of the casing is smaller than the inner diameter of the borehole.

[0007] In some embodiments, the jet flow liquid is pressurized by the pressure device to break the surrounding rock of the plugging position to form a plugging space, specifically comprising: moving the jet port of the pressure device to the plugging position to plug the borehole. The pressure device is controlled to pressurize the jet flow liquid to make it spray out of the jet port. The jet port is controlled to rotate and spray the jet flow liquid towards the inner wall of the borehole until the plugging space is formed at the plugging position. The plugging space is an annular space outside the borehole.

[0008] The application also provides a water conducting fracture sealing device, which comprises a drill bit, a power unit, a pressure device, a refrigerant filling device, a grouting device and a jetting device. The power unit is connected to the drill bit on the side away from the tunneling face of the drill bit, and is used to drive the drill bit to drill and tunnel to a preset sealing position. The jetting device is arranged on the side away from the tunneling face of the drill bit, and is used to jet liquid around the sealing position. The pressure device is connected to the jetting device, and is used to pressurize the jet flow liquid so that the jet flow liquid is jetted out of the jetting device to form a sealing space. The refrigerant filling device is connected to the jetting device, and is used to inject refrigerant into the jetting device so that the refrigerant flows into the sealing space. The grouting device is connected to the jetting device, and is used to inject cement mortar into the jetting device so that the cement mortar replaces the liquid in the sealing space.

[0009] In some embodiments, the drill bit further comprises a positioning device and a position adjusting device. The positioning device is used to obtain the position of the drill bit, and the tunneling direction of the drill bit is adjusted by the position adjusting device so that the drill bit tunnels to the sealing position.

[0010] In some embodiments, the position adjusting device comprises at least four protrusions. The at least four protrusions are arranged on the side away from the tunneling face of the drill bit, and are uniformly arranged along the outer peripheral surface of the drill bit. The protrusion height of the at least four protrusions is adjusted according to the preset tunneling direction, so that the tunneling face of the drill bit is inclined towards the tunneling direction.

[0011] In some embodiments, the drill bit further comprises a water stop plug. The water stop plug is arranged between the power unit and the jetting device, and is used to seal the gap between the drill bit and the drill hole.

[0012] In some embodiments, the jetting device comprises a rotating mechanism and at least two jetting ports. The rotating mechanism is used to drive the at least two jetting ports to rotate around the central axis of the drill bit. The at least two jetting ports are used to jet jet flow liquid, refrigerant and cement mortar.

[0013] In some embodiments, the number of jetting ports is three, and the jet flow liquid, the refrigerant and the cement mortar are jetted out of the three jetting ports respectively.

[0014] As can be seen from the above, the water conducting fracture sealing method provided by the application realizes the sealing of the water conducting fracture by drilling a drill hole, jetting and breaking the rock mass at a preset sealing position to form a sealing space, cooling the jet flow liquid by refrigerant to make the jet flow liquid solidify and expand, extruding the rock mass around the sealing space to make the water conducting fracture closed after being extruded, and then fixing the sealing space by grouting into the sealing space to realize the sealing of the unexposed water conducting fracture. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0016] Figure 1 The flowchart of the water flowing fracture plugging method provided by the embodiments of the application is shown in the figure.

[0017] Figure 2 The flowchart of the tunneling to the plugging position method provided by the embodiments of the application is shown in the figure.

[0018] Figure 3 The flowchart of the jet flow method provided by the embodiments of the application is shown in the figure.

[0019] Figure 4 The structural diagram of the water flowing fracture plugging device provided by the embodiments of the application is shown in the figure.

[0020] Figure 5 The structural diagram of the stratum after drilling according to the method provided by the embodiments of the application is shown in the figure.

[0021] Figure 6 The structural diagram of the stratum in the jet flow breaking process according to the method provided by the embodiments of the application is shown in the figure.

[0022] Figure 7 The structural diagram of the stratum in the freezing process according to the method provided by the embodiments of the application is shown in the figure.

[0023] Figure 8 The structural diagram of the stratum after grouting according to the method provided by the embodiments of the application is shown in the figure.

[0024] The figure shows the following: 1-drill bit; 11-positioning device; 12-position adjusting device; 121-protruding part; 13-water stop plug; 2-jet flow device; 21-rotary mechanism; 22-jet flow port. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below with reference to specific embodiments and the drawings.

[0026] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise defined. The terms "first", "second" and the like used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0027] As shown in Figure 1 , the present application provides a water flowing fracture plugging method, comprising:

[0028] Step S1, controlling the drill bit to excavate to a preset plugging position.

[0029] Step S2, pressurizing the jet flow liquid by the pressure device to make the jet flow liquid break the surrounding rock of the plugging position to form a plugging space. Wherein, the jet flow liquid is mixed with the broken rock in the plugging space.

[0030] Step S3, injecting a refrigerant into the plugging space to cool the jet flow liquid below the melting point.

[0031] Step S4, injecting cement mortar into the plugging space until all the jet flow liquid in the plugging space is replaced by the cement mortar.

[0032] In the embodiment, as shown in Figure 5 , by making the drill bit excavate to the preset plugging position, the water flowing fracture can be plugged at the preset plugging position. Preferably, the plugging position can be set between multiple proven water flowing fractures, and the drill hole is arranged substantially perpendicular to the water flowing fracture, so that multiple water flowing fractures in front and rear of the plugging space can be plugged in a single plugging operation.

[0033] As shown in Figure 6 , the jet flow liquid is used to break the surrounding rock perpendicular to the direction of the drill hole in the plugging position, and is mixed with the broken rock, thereby forming a plugging space with a specific shape and containing broken rock and jet flow liquid. Wherein, the type of jet flow liquid is not limited, and can be reasonably selected according to actual application needs.

[0034] Preferably, in order to reduce the use cost of the jet flow liquid, the jet flow liquid can be water.

[0035] As shown in Figure 7 , the refrigerant is used to cool the jet flow liquid, so that the jet flow liquid condenses and expands, thereby extruding the inner wall of the sealing space, and further achieving the purpose of extruding the water-conducting fractured zone of the rock mass.

[0036] Preferably, in order to achieve stronger fluidity and reduce the use cost of the refrigerant, the refrigerant can be liquid nitrogen.

[0037] As shown in Figure 8 , because the formation temperature is usually high, the solidified jet flow liquid will melt, thereby causing the rebound of the sealed water-conducting fractured zone, so it is also necessary to reinforce the sealing space by cement grouting. By continuously introducing cement mortar to exchange heat with the solidified jet flow liquid, the jet flow liquid is accelerated to melt and gradually replaced by the cement mortar, and after the cement mortar solidifies, the sealing space is fixed.

[0038] In some embodiments, as shown in Figure 2 , step S1 specifically includes:

[0039] Step S11, a vertical section borehole is opened at a preset drilling position until the drilling depth reaches a preset driving depth.

[0040] Step S12, the drill bit is controlled to deflect along a preset deflecting trajectory until the driving direction of the drill bit points to the sealing position.

[0041] Step S13, the drill bit is controlled to drive to the sealing position along the driving direction after deflection.

[0042] In this embodiment, because the water-conducting fractured zone to be sealed is distributed along the vertical direction to the horizontal plane, as shown in Figure 5 , it is necessary to open a borehole along the direction of the vertical water-conducting fractured zone, so that the sealing space can be opened parallel to the water-conducting fractured zone, thereby making the jet flow liquid expand in the direction perpendicular to the water-conducting fractured zone when the jet flow liquid is frozen, and further pressing and closing the water-conducting fractured zone, thereby achieving the sealing of the water-conducting fractured zone.

[0043] Therefore, in actual application, in order to achieve the opening of the horizontal borehole, it is necessary to first open a vertical borehole, and after driving to a preset vertical section depth, continue to excavate forward by deflection, until the central axis of the drill bit points to the preset sealing position, and then start to excavate to the sealing position at an angle close to horizontal, until reaching the preset sealing position.

[0044] As an optional implementation, in actual application, after the vertical section is excavated, the key point of the vertical section drilling is taken as the starting point of the build-up section drilling, and the vertical height of the build-up section needs to meet wherein h2 is the vertical height required by the build-up section.

[0045] The end point of the build-up section is the starting point of the along-bedding section, and the plugging space is constructed after the drill bit continuously excavates to the plugging position. The plugging position and the number of the plugging space can be multiple, and the length of the rock stratum that can be treated by each plugging space is L, satisfying the formula wherein k is the ice expansion coefficient of the jet flow liquid, L2 is the length of the jet flow breaking section, and φ is the porosity of the treatment area.

[0046] In some embodiments, after step S11, further comprising:

[0047] Step S111, installing a casing into the borehole and fixing the casing. The outer diameter of the casing is smaller than the inner diameter of the borehole.

[0048] In the embodiment, the casing is used to support the vertical section to prevent the vertical section borehole from being damaged during the plugging process.

[0049] As an optional implementation, the vertical section is drilled by a drill bit with a caliber of Ф311 mm, a Ф273 mm casing is lowered into the borehole after entering the complete bedrock for 10 m, and the whole borehole is cemented. After the strength meets the standard, a Ф215 mm drill bit is used for drilling, a Ф168 mm casing is lowered into the borehole after reaching the designed final hole position of the vertical section, the whole borehole is cemented, and the well is washed. The final hole position is the starting point of the build-up section.

[0050] In some embodiments, as shown in Figure 3 Step S2 specifically comprises:

[0051] Step S21, moving the jetting port of the pressure device to the plugging position to plug the borehole.

[0052] Step S22, controlling the pressure device to pressurize the jet flow liquid to spray the jet flow liquid from the jetting port.

[0053] Step S23, controlling the jetting port to rotate and spray the jet flow liquid towards the inner wall of the borehole until the plugging space is formed at the plugging position. The plugging space is an annular space sleeved outside the borehole.

[0054] In the embodiment, the pressure device is used to pressurize the jet flow liquid, so as to break the rock mass around the plugging position. By controlling the jetting port to rotate the inner wall of the borehole, an annular plugging space is formed. By cooling and expanding the jet flow liquid in the annular plugging space, the stress generated by the expansion is directed to the direction perpendicular to the water conducting fracture, so as to directionally extrude the rock mass, and reduce the influence of the solidified jet flow liquid on the rock mass in other directions.

[0055] As can be seen from the above embodiments of the application, the jet flow liquid is cooled by the refrigerant, so that the jet flow liquid is solidified and expanded, the rock mass around the plugging space is extruded, and the water conducting fracture is closed after being extruded, so as to realize the plugging of the water conducting fracture. Finally, the plugging space is fixed by grouting into the plugging space, so as to realize the plugging of the water conducting fracture which is not exposed.

[0056] As shown in Figure 4 The application also provides a water conducting fracture plugging device, which comprises a drill bit 1, a power unit, a pressure device, a refrigerant filling device, a grouting device and a jetting device 2.

[0057] The power unit is connected to the side of the drill bit 1 away from the tunneling face of the drill bit 1, and is used to drive the drill bit 1 to drill a borehole and tunnel to a preset plugging position.

[0058] The jetting device 2 is arranged on the side away from the tunneling face of the drill bit 1, and is used to jet liquid around the plugging position.

[0059] The pressure device is connected to the jetting device 2, and is used to pressurize the jet flow liquid, so that the jet flow liquid is jetted out of the jetting device 2 to form a plugging space.

[0060] The refrigerant filling device is connected to the jetting device 2, and is used to inject refrigerant into the jetting device 2, so that the refrigerant flows into the plugging space.

[0061] The grouting device is connected to the jetting device 2, and is used to inject cement mortar into the jetting device 2, so that the cement mortar replaces the liquid in the plugging space.

[0062] In the embodiment, the power unit is used to provide propelling force and rotating force for the drill bit 1, so that the drill bit 1 tunnels to the preset plugging position.

[0063] The jetting device 2 is used to jet jet flow liquid, refrigerant and cement mortar around the borehole. The jetting device 2 further comprises at least one jetting port 22, which is used to make the liquid to be jetted flow out of the jetting port 22.

[0064] Preferably, the number of injection ports 22 is the same as the type of liquid required to be injected into the borehole, and by providing dedicated injection ports 22 and corresponding delivery pipelines for different types of liquid to be injected, different types of liquid can be used with corresponding injection ports 22 and pipelines, avoiding mixing or damaging the pipelines and injection ports 22 when injecting different types of liquid.

[0065] The pressure device is used to pressurize the jetting liquid, so that the jetting liquid is injected at high speed from the injection port 22 of the jetting device 2, thereby achieving the crushing of the rock formation around the plugging position.

[0066] The refrigerant filling device is used to fill refrigerant into the jetting device 2, so that the refrigerant can flow into the plugging space to cool the temperature of the jetting liquid below the freezing point.

[0067] Preferably, the refrigerant can be a low-temperature liquid, and the type of low-temperature liquid is not limited, which can be one of liquid nitrogen, liquid carbon dioxide and liquid argon, and can be reasonably selected according to actual application needs.

[0068] The grouting device is used to inject cement mortar into the jetting device 2, so that the cement mortar exchanges heat with the solidified jetting liquid, and the jetting liquid is replaced by the cement mortar after melting, and the cement mortar provides support to the plugging space after solidification, preventing the reformation of the water-conducting fracture caused by the decrease of the stress in the bottom layer.

[0069] As an optional embodiment, the power unit can be a high-performance drilling machine, with a thrust force range of 0-20000KN, which can be adjusted according to the hardness of the stratum, and a rotational speed range of 0-300r / min, which can be adjusted according to the drilling speed and the characteristics of the stratum. The power unit is equipped with a thrust force display, a rotational speed display and a drilling trajectory display. The resolution of the display is 1920x1080 pixels, with high-definition display to ensure clear and visible information. The thrust force display can display the thrust force of the drilling machine in real time, helping the operator to adjust the drilling pressure; the rotational speed display is used to monitor the rotational speed of the drilling machine to ensure stable output of the jetting system; and the drilling trajectory display is a key information receiving center, which receives data from the directional unit and displays the drilling trajectory in real time, so that the operator can accurately master the drilling progress and direction.

[0070] As an optional embodiment, the jetting device can include at least two injection ports, which can realize high-pressure injection of water, cement slurry, double-liquid type cement slurry, liquid nitrogen, etc., and the injection of liquid nitrogen is a dedicated injection port. The jetting device is installed on the rotating shaft of the drill pipe, and the rotating shaft ensures that the injection port remains unchanged during the rotation of the drill bit.

[0071] As an optional embodiment, the pressure device can include the injection port on the jetting-grouting integrated drill bit.

[0072] The jet rock breaking radius satisfies the formula:

[0073]

[0074] In the formula, r is the jet rock breaking radius, m; V is the water flow volume, m3; d is the nozzle diameter, m; p is the jet pressure, MPa; σk is the rock strength parameter, which depends on the occurrence condition and mechanical parameter, etc.; and ω is the drill bit rotation angular velocity, rad / s.

[0075] The jet rock breaking radius can be adjusted according to the lithology of the jet flow area and the radius required by the project.

[0076] In some embodiments, the drill bit 1 further comprises a positioning device 11 and a position adjusting device 12.

[0077] The positioning device 11 is used to obtain the position of the drill bit 1, and the position adjusting device 12 is used to adjust the digging direction of the drill bit 1, so that the drill bit 1 digs to the plugging position.

[0078] In this embodiment, since the borehole needs to be deviated during the digging process to make the drill bit 1 dig to the correct plugging position, the position adjusting device 12 is also needed to be arranged to deflect the drill bit 1 towards the plugging position to realize the borehole deviation; and the positioning device 11 is also needed to be installed on the drill bit 1 to timely adjust the digging direction of the drill bit 1 to make the drill bit 1 accurately reach the preset plugging position.

[0079] As a preferred implementation, the positioning device 11 is equipped with at least two high-precision GPS positioners. The accuracy of these positioners is ≤5 m, which can send the accurate position information of the drill bit to the power unit in real time, and provide accurate borehole position reference for the operator. The data transmission frequency is 1 Hz, and the data is transmitted in real time to ensure the timeliness of the information. Through the GPS positioning, the operator can monitor the moving track of the drill bit in real time, and ensure the accuracy of the borehole operation.

[0080] In some embodiments, the position adjusting device 12 comprises at least four protrusions 121.

[0081] The at least four protrusions 121 are arranged on the side away from the digging face of the drill bit 1, and are uniformly arranged along the outer circumferential surface of the drill bit 1, which are used to adjust the protruding height of the at least four protrusions 121 according to the preset digging direction, so that the digging face of the drill bit 1 is inclined towards the digging direction.

[0082] In this embodiment, the position adjusting device 12 supports the drill bit 1 through the at least four protrusions 121, so that the digging face of the drill bit 1 is excavated towards the preset digging direction.

[0083] As a preferred embodiment, the diameter of the protrusions 121 is 50 mm (a commonly used specification, providing sufficient angle build-up force), and the material is high-strength alloy steel (high elastic modulus, not easy to deform). The remote control response time of the protrusions 121 is ≤1 s, fast response, ensuring timely adjustment of the drilling trajectory. The included angle of the axis extension lines of the four protrusions 121 is 90°, and they are located on the same plane, which is perpendicular to the axis of the drill bit 1. This design enables the drill bit 1 to maintain a stable posture during drilling. More advanced is that the four protrusions 121 can move up and down along the radial direction of the drill bit 1, with an adjustment range of 0-20 mm, which can be accurately adjusted according to actual needs. By accurately controlling the height of the four protrusions 121, the operator can achieve flexible control of the drilling trajectory. When the drill bit 1 needs to be deflected in a certain direction, the protrusion 121 in that direction is simply lowered, so that the drill bit 1 receives less resistance in that direction, thereby achieving deflection. The deflection angle satisfies the formula where h1 is the protrusion height; l is the length of the drill bit 1. The protrusions 121 are installed on the rotating shaft of the drill rod, and the rotating shaft enables the protrusions 121 to maintain the same direction during the rotation of the drill bit 1.

[0084] In some embodiments, the drill bit 1 also includes a water stop plug 13.

[0085] The water stop plug 13 is arranged between the power unit and the jetting device 2, and is used to block the gap between the drill bit 1 and the borehole.

[0086] In this embodiment, the water stop plug 13 is used to block the borehole, and when the jet flow liquid is injected, the borehole is blocked to prevent the jet flow liquid from overflowing from the borehole inlet.

[0087] As a preferred embodiment, the water stop plug 13 can be made of rubber and can be inflated to expand. When not inflated, it is retracted in the drill bit 1, and the outer wall is not higher than the outer wall of the drill bit 1.

[0088] In some embodiments, the jetting device 2 includes a rotating mechanism 21 and at least two jetting ports 22.

[0089] The rotating mechanism is used to drive the at least two jetting ports 22 to rotate around the central axis of the drill bit 1, and the at least two jetting ports 22 are used to inject jet flow liquid, refrigerant, and cement mortar.

[0090] In this embodiment, by arranging corresponding jetting ports 22, different types of liquid can be provided with dedicated jetting channels, avoiding blockage of the jetting ports 22.

[0091] In some embodiments, the number of jetting ports 22 is three, and the jet flow liquid, the refrigerant, and the cement mortar are injected by the three jetting ports 22, respectively.

[0092] In the embodiment, the three injection ports 22 are arranged to spray the jetting liquid, the refrigerant and the cement mortar through the special injection ports 22, so as to avoid the blockage of the injection ports 22.

[0093] It should be noted that the above describes some embodiments of the present application. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or can be advantageous.

[0094] It should be noted that the embodiments of the present application can also be further described in the following ways:

[0095] A water channel fracture plugging method, comprising:

[0096] Controlling the drill bit to excavate to a preset plugging position.

[0097] Pressurizing the jetting liquid through a pressure device to break the surrounding rock of the plugging position, and form a plugging space. The jetting liquid is mixed with the broken rock in the plugging space.

[0098] Injecting a refrigerant into the plugging space to cool the jetting liquid to below the melting point.

[0099] Injecting a cement mortar into the plugging space until all the jetting liquid in the plugging space is replaced by the cement mortar.

[0100] Optionally, the controlling the drill bit to excavate to a preset plugging position specifically comprises:

[0101] Opening a vertical section borehole at the preset borehole position until the borehole depth reaches a preset excavation depth.

[0102] Controlling the drill bit to deflect along a preset deflecting trajectory until the excavation direction of the drill bit points to the plugging position.

[0103] Controlling the drill bit to excavate along the deflecting direction to the plugging position.

[0104] Optionally, after the borehole depth reaches the preset excavation depth, it further comprises:

[0105] Installing a casing into the borehole and fixing the casing. The outer diameter of the casing is smaller than the inner diameter of the borehole.

[0106] Optionally, the pressurizing the jetting liquid through a pressure device to break the surrounding rock of the plugging position, and form a plugging space specifically comprises:

[0107] Moving the injection port of the pressure device to the plugging position to plug the borehole.

[0108] The pressure device pressurizes the jetting liquid to make the jetting liquid jet out from the jetting port.

[0109] The jetting port rotates and jets the jetting liquid towards the inner wall of the borehole until a sealing space is formed at the sealing position. The sealing space is an annular space arranged outside the borehole.

[0110] The water fracture sealing device comprises a drill bit, a power unit, a pressure device, a refrigerant filling device, a grouting device and a jetting device.

[0111] The power unit is connected to the drill bit at a side away from the tunneling face of the drill bit, and is used to drive the drill bit to drill a borehole and tunnel to a preset sealing position.

[0112] The jetting device is arranged at a side away from the tunneling face of the drill bit, and is used to jet liquid around the sealing position.

[0113] The pressure device is connected to the jetting device, and is used to pressurize the jetting liquid to make the jetting liquid jet out from the jetting device to form a sealing space.

[0114] The refrigerant filling device is connected to the jetting device, and is used to inject refrigerant into the jetting device to make the refrigerant flow into the sealing space.

[0115] The grouting device is connected to the jetting device, and is used to inject cement mortar into the jetting device to make the cement mortar replace the liquid in the sealing space.

[0116] Optionally, the drill bit further comprises a positioning device and a position adjusting device.

[0117] The positioning device is used to obtain the position of the drill bit, and the position adjusting device is used to adjust the tunneling direction of the drill bit to make the drill bit tunnel to the sealing position.

[0118] Optionally, the position adjusting device comprises at least four protrusions.

[0119] The at least four protrusions are arranged at a side away from the tunneling face of the drill bit, and are uniformly arranged along the outer circumferential surface of the drill bit. The protrusion height of the at least four protrusions is adjusted according to the preset tunneling direction to make the tunneling face of the drill bit tilt towards the tunneling direction.

[0120] Optionally, the drill bit further comprises a water stop plug.

[0121] The water stop plug is arranged between the power unit and the jetting device, and is used to seal the gap between the drill bit and the borehole.

[0122] Optionally, the jetting device comprises a rotating mechanism and at least two jetting ports.

[0123] The rotating device is used to drive at least two jet ports to rotate around the central axis of the drill bit, and the at least two jet ports are used to spray jet liquid, refrigerant and cement mortar.

[0124] Optionally, the number of the jet ports is three, and the jet liquid, the refrigerant and the cement mortar are sprayed by the three jet ports respectively.

[0125] It should be understood by those of ordinary skill in the art that the above discussion of any embodiment is merely exemplary and is not intended to suggest the scope of the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above, which are not provided in details for the sake of brevity.

[0126] In addition, in order to simplify the description and discussion, and so as not to make the embodiments of the present application difficult to understand, the well-known power / ground connections of integrated circuit (IC) chips and other components can or can not be shown in the provided drawings. Furthermore, the devices can be shown in the form of block diagrams in order to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented for the embodiments of the present application (i.e. these details should be fully within the understanding of those skilled in the art). In the case of setting forth specific details (e.g. circuits) to describe the exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered as illustrative rather than limiting.

[0127] Although the present application has been described in conjunction with the specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

Claims

1. A method for sealing water conducting fractures, comprising: controlling a drill bit to excavate to a preset sealing position; pressurizing a jetting liquid by a pressure device to make the jetting liquid break surrounding rock of the sealing position to form a sealing space; wherein the jetting liquid mixes with the broken rock in the sealing space, and the sealing space is an annular space arranged outside a borehole; injecting a refrigerant into the sealing space to cool the jetting liquid to below the melting point, so that the jetting liquid condenses and expands, and the stress generated by the expansion is directed perpendicular to the water conducting fractures to press the inner wall of the sealing space, so that the water conducting fractures are closed after being pressed; wherein the length of the rock formation treated by each sealing space is represented by the following formula: ； Wherein, k represents the ice expansion coefficient of the jet liquid, L2 represents the length of the jet breaking section, and φ is the void fraction of the treatment zone, represents the length of the treated rock formation; injecting cement mortar into the sealing space until all the jetting liquid in the sealing space is replaced by the cement mortar.

2. The waterfissure sealing method according to claim 1, wherein The control of the drill bit to excavate to the preset sealing position specifically comprises: opening a vertical section borehole at a preset borehole position until the borehole depth reaches a preset excavation depth; controlling the drill bit to deflect along a preset deflecting trajectory until the excavation direction of the drill bit points to the sealing position; controlling the drill bit to excavate to the sealing position along the deflecting direction after deflection.

3. The waterfissure sealing method according to claim 2, wherein After the borehole depth reaches the preset excavation depth, further comprising: installing a casing into the borehole and fixing the casing; wherein the outer diameter of the casing is smaller than the inner diameter of the borehole.

4. The waterfissure sealing method according to claim 1, wherein The pressurization of the jetting liquid by the pressure device to make the jetting liquid break the surrounding rock of the sealing position to form a sealing space specifically comprises: moving the jetting port of the pressure device to the sealing position to seal the borehole; controlling the pressure device to pressurize the jetting liquid to make the jetting liquid jet out of the jetting port; controlling the jetting port to rotate and jet the jetting liquid towards the inner wall of the borehole until the sealing space is formed at the sealing position; wherein the sealing space is an annular space arranged outside the borehole.

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