Underground coal mine hydraulic fracturing detection device, directional drilling machine and detection method

Abstract

The invention provides a coal mine underground hydraulic fracturing detection device, a directional drilling machine and a detection method.The detection device comprises a detection unit and an analysis unit, the detection unit is arranged on the outer side of a drill rod, and the detection unit comprises an optical fiber and at least one installation structure connected with the drill rod; the optical fiber is arranged on the installation structure and arranged in the length direction of the drill rod, the detection unit and the analysis unit are connected through the optical fiber, one or more sensors are arranged on the optical fiber, and the sensors can enter a drill hole along with the optical fiber. According to the embodiment of the invention, the real-time dynamic monitoring requirement of the fracturing condition of the top plate can be realized, the acquisition precision of the fracturing operation data is improved, and a dynamic monitoring means is provided for realizing an intelligent mine large platform.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of hydraulic fracturing detection, and in particular, to an underground coal mine hydraulic fracturing detection device, a directional drill, and a detection method. Background Art

[0002] Roof refers specifically to the rock layer on top of the tunnel in the mine. Fracturing refers to a method of using the pressure transfer effect of fracturing fluid to form cracks in the stratum. The hydraulic fracturing technology in underground coal mines is to inject high-pressure fracturing fluid into the target rock layer, form a fracture network system by transforming the rock layer structure, weaken the strength and integrity of the roof, divide the complete rock layer into multiple layers, so that the direct roof collapses in layers, and other roof rock layers achieve stress transfer or energy dispersion, shorten the initial pressure and periodic pressure step, weaken the transfer of high stress to adjacent tunnels, thereby slowing down the deformation of adjacent tunnels, which is of great significance to mine safety production.

[0003] In the global mining industry, roof fracturing effect detection and evaluation is a very important task. It is also the most critical link affecting mining safety, especially the temperature and pressure data in the mine. Therefore, it is necessary to use relevant technical means to accurately detect these data in real time in order to obtain relevant underground information in time, which is of extraordinary significance to underground mining.

[0004] At present, the detection and evaluation of roof fracturing mainly adopts the peep technology and microseismic detection technology. Among them, the peep technology requires that after the fracturing construction is completed, the peepscope is inserted into the borehole to detect the cracks in the hole, but this technology can only detect the cracks near the hole wall, and the extension depth, development radius, and changes in ground stress of the cracks cannot be detected; while the microseismic detection technology collects data through sensors arranged on the tunnel wall or other locations near the borehole to collect vibration waves during the fracturing process. This technology can only collect vibrations, but cannot collect pressure and temperature change data, and the detection accuracy of fracturing operation data is insufficient. Summary of the invention

[0005] In order to solve the problem in the prior art that the detection data is insufficient and the data accuracy is insufficient during the fracturing operation, thus making it impossible to judge the fracturing effect, the embodiments of the present disclosure provide a coal mine underground hydraulic fracturing detection device, a directional drilling rig and a detection method.

[0006] In view of this, one aspect of the present disclosure provides a coal mine underground hydraulic fracturing detection device, including a detection unit and an analysis unit, wherein the detection unit is arranged on the outside of a drill rod, and the detection unit includes an optical fiber and at least one mounting structure connected to the drill rod, the optical fiber is arranged on the mounting structure and along the length direction of the drill rod, the detection unit and the analysis unit are connected through the optical fiber, and one or more sensors are arranged on the optical fiber, and the sensor can enter the borehole along the optical fiber.

[0007] In some embodiments, a first sealing structure is sleeved on the end of the optical fiber, and at least one of the sensors is disposed in the first sealing structure.

[0008] In some embodiments, the sensor includes at least a temperature sensor, a pressure sensor, and a vibration sensor. The temperature sensor and the vibration sensor are disposed in the first sealing structure, and the pressure sensor is disposed on an outer surface of the first sealing structure.

[0009] In some embodiments, a protective cover is provided on the outer side of the pressure sensor, and a through hole is provided on the protective cover.

[0010] In some embodiments, the first sealing structure is a structure with two ends open, and a plug is provided at a front end away from the optical fiber.

[0011] In some embodiments, an armor structure is disposed on the outer side of the optical fiber, the armor structure is connected to the first sealing structure via a connector, and a second sealing structure is disposed in the armor structure near the connector.

[0012] Another aspect of the present disclosure provides a directional drilling rig, comprising a drill rod and any one of the above-mentioned coal mine underground hydraulic fracturing detection devices, wherein a fracturing tool is disposed at the end of the drill rod.

[0013] In some embodiments, the drill rod includes a plurality of drill rod units, the plurality of drill rod units are connected in series in sequence, and the mounting structure is respectively connected to two adjacent drill rod units.

[0014] In some embodiments, it also includes a walking system, on which a power system, a winch assembly and a drill rod conveying system are arranged, the winch assembly and the drill rod conveying system are respectively connected to the power system, the winch assembly is used to drive the movement of the optical fiber, and the drill rod conveying system is used to realize the conveyance of the drill rod.

[0015] Another aspect of the present disclosure provides a method for detecting hydraulic fracturing in an underground coal mine, comprising:

[0016] Lower the detection unit into the borehole along with the drill pipe;

[0017] During the perforation and fracturing operation, the fracturing operation data is acquired through the sensor in the detection unit, and the fracturing operation data is transmitted to the analysis unit through the optical fiber in the detection unit;

[0018] The analysis unit analyzes the fracturing operation data and generates a crack graph from the fracturing operation data;

[0019] The fracturing parameters are adjusted according to the fracturing operation data and the crack graph.

[0020] The present disclosure can realize the real-time dynamic monitoring demand for roof fracturing conditions, improve the collection accuracy of fracturing operation data, and provide a dynamic monitoring method for realizing a smart mine platform.

[0021] In order to make the above-mentioned objectives, features and advantages of the embodiments of the present disclosure more obvious and understandable, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0023] Figure 1 It is a schematic diagram of the installation of the underground hydraulic fracturing detection device for a coal mine provided by an embodiment of the present disclosure;

[0024] Figure 2 It is a structural schematic diagram of a coal mine underground hydraulic fracturing detection device provided by an embodiment of the present disclosure;

[0025] Figure 3 is a structural schematic diagram of a directional drilling rig provided in an embodiment of the present disclosure;

[0026] Figure 4 It is a schematic diagram of the steps of the coal mine underground hydraulic fracturing detection method provided by the embodiment of the present disclosure.

[0027] Among them, the above-mentioned Figures 1 to 3 The following reference numerals are included:

[0028] 1-installation structure; 11-temperature sensor; 12-pressure sensor; 13-vibration sensor; 2-optical fiber; 21-armored structure; 3-first sealing structure; 31-plug; 4-protective cover; 4a-through hole; 5-connector; 6-second sealing structure; 100-detection unit; 300-directional drilling rig; 310-drill rod; 310a-drill rod unit; 320-power system; 330-travel system; 331-crawler; 332-hydraulic motor; 333-skid frame; 334-liftable support leg; 340-winch assembly; 341-rotating shaft; 342-roller frame; 350-drill rod conveying system; 351-clamping device; 352-alignment device. DETAILED DESCRIPTION

[0029] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0030] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0032] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0033] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0034] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0035] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0037] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0038] A first embodiment of the present disclosure provides an underground hydraulic fracturing detection device for a coal mine, wherein the underground hydraulic fracturing detection device for a coal mine is arranged on a directional drilling rig. The directional drilling rig of this embodiment includes a drill rod, and a fracturing tool is arranged at the end of the drill rod. After the directional drilling rig advances along a directional borehole through the drill rod, the directional drilling rig performs perforation fracturing operations through the fracturing tool.

[0039] like Figure 1 and Figure 2 As shown, the coal mine underground hydraulic fracturing detection device is arranged on the drill rod 310 of the directional drilling rig, and includes a detection unit 100. The detection unit 100 is arranged on the outside of the drill rod 310 so that it can move in the roof rock layer together with the drill rod 310.

[0040] The detection unit 100 includes an optical fiber 2 and at least one mounting structure 1. The optical fiber 2 is arranged on the drill rod 310 through the mounting structure 1. The optical fiber 2 is arranged along the length direction of the drill rod 310, so that it is convenient to move together with the drill rod 310; at least one sensor is arranged at the end of the optical fiber 2, and the sensor can enter the borehole with the optical fiber 2, and the fracturing operation data during the fracturing operation is collected through the sensor.

[0041] Here, the optical fiber 2 is fixed on the drill rod 310 by the mounting structure 1, so that the optical fiber 2 can be prevented from shaking between the borehole and the drill rod 310, and the friction between the optical fiber 2 and the borehole wall can be reduced.

[0042] In this embodiment, the drill rod 310 is used to move along the directional borehole in the roof rock formation, and the sensor can enter the borehole along with the drill rod 310. In this way, when the directional drilling rig is used to perform fracturing operations, the sensor collects fracturing operation data during the fracturing operation process. The fracturing operation data here include, for example, operation data such as the temperature of the fracturing fluid, the pressure of the fracturing fluid, and the fluctuation parameters of the formation of rock formation cracks. In this way, in this embodiment, the detection unit 100 can monitor the pressure on the roof, the fracturing temperature, the propagation of the fracturing fluid, and the vibration when the cracks are split in real time during the fracturing operation, thereby realizing real-time monitoring and analysis of the formation parameters and the dynamic changes of the fluid.

[0043] Specifically, since the optical fiber 2 is arranged on the outside of the drill rod 310, and the sensor is arranged at the end of the optical fiber 2, the sensor on the optical fiber 2 can directly contact the fracturing fluid in the borehole during the fracturing operation. Compared with the method of arranging the sensor in the drill rod in the prior art, since the fracturing fluid inside and outside the drill rod 310 has differences in pressure, temperature and vibration, the setting position of the detection unit 100 in this embodiment makes the collected and acquired fracturing operation data more accurate, and can solve the problem of inaccurate fracturing operation data measured due to changes in formation temperature and pressure under crack opening conditions. In addition, arranging the optical fiber 2 on the outside of the drill rod 310 can also prevent the fracturing fluid in the drill rod 310 from scouring the optical fiber 2, especially when the fracturing fluid contains sand, it can effectively protect the optical fiber and increase the service life of the optical fiber.

[0044] Further, in order to protect the sensor, the end of the optical fiber 2 is sleeved with a first sealing structure 3, and the sensor is arranged on the first sealing structure 3. The sensor at least includes a temperature sensor 11, a pressure sensor 12 and a vibration sensor 13, wherein the temperature sensor 11, the pressure sensor 12 and the vibration sensor 13 are all connected to the optical fiber 2 through a wire, wherein the temperature sensor 11 is used to detect the temperature data of the fracturing fluid in the borehole, the pressure sensor 12 is used to detect the pressure data of the fracturing fluid in the borehole, and the vibration sensor 13 is used to detect and collect the fluctuation data in the process of crack formation and extension (or development), and the fluctuation mentioned here is generally conducted through the fracturing fluid.

[0045] Specifically, the temperature sensor 11 and the vibration sensor 13 are arranged in the first sealing structure 3, and the temperature and fluctuation detection is realized through the wall surface of the first sealing structure 3. The first sealing structure 3 here protects the temperature sensor 11 and the vibration sensor 13, so that when the drill rod 310 is pushed into or out of the borehole, the first sealing structure 3 can prevent the temperature sensor 11 and the vibration sensor 13 from colliding and rubbing with the rock formation, and can also prevent the fracturing fluid from scouring and damaging the temperature sensor 11 and the vibration sensor 13.

[0046] The pressure sensor 12 is arranged on the outer surface of the first sealing structure 3 so as to be in contact with the fracturing fluid and detect the pressure of the fracturing fluid. Furthermore, in order to protect the pressure sensor 12, a protective cover 4 is provided on the outer side of the pressure sensor 12, and a through hole 4a is provided on the protective cover 4. The through hole 4a here is used for the inflow of the fracturing fluid, and the pressure sensor 12 detects the pressure of the fracturing fluid flowing in through the through hole 4a. The protective cover 4 here protects the pressure sensor 12. When the drill rod 310 is pushed into or out of the borehole, the protective cover 4 can prevent the pressure sensor 12 from colliding and rubbing against the rock formation.

[0047] Preferably, the first sealing structure 3 is a cylindrical or shell-like structure with two ends open, which is, for example, sleeved on the end of the optical fiber 2. Further, a plug 31 is provided away from the end of the optical fiber 2, and the plug 31 is used to seal the head end of the first sealing structure 3, thereby preventing the fracturing fluid from entering the interior of the first sealing structure 3.

[0048] In this embodiment, an armor structure 21 is arranged on the outside of the optical fiber 2. The armor structure 21 is made of stainless steel. The optical fiber 2 is sealed and protected by the armor structure 21. Here, when the drill rod 310 is pushed into or withdrawn from the borehole, the armor structure 21 can prevent the optical fiber 2 from colliding with and rubbing against the rock formation.

[0049] Further, the armor structure 21 and the first sealing structure 3 are connected through a connector 5, wherein the connector 5 is a structure with two ends open, a first end of which is connected to the first sealing structure 3, and a second end of which is connected to the armor structure 21, for example, the first end and the second end of the connector 5 are respectively connected to the inner walls of the ends of the armor structure 21 and the first sealing structure 3. The sizes of the first end and the second end are respectively determined based on the end sizes of the first sealing structure 3 and the armor structure 21, and the connector 5 can achieve sealing between the armor structure 21 and the first sealing structure 3.

[0050] Furthermore, a second sealing structure 6 is provided in the armor structure 21 near the connector 5 , and the second sealing structure 6 can prevent the fracturing fluid from entering the armor structure 21 , thereby reducing damage to the optical fiber 2 caused by the fracturing fluid.

[0051] Furthermore, the coal mine underground hydraulic fracturing detection device also includes an analysis unit, and the analysis unit is electrically connected to the sensor. The analysis unit here can be set on the ground or in the underground tunnel, and is especially connected to the sensor through the optical fiber 2. The analysis unit and the detection unit 100 in this embodiment are two independent units, so that when the drill rod 310 operates alone underground, the detection unit 100 and the analysis unit can realize joint operation, and can also realize rapid assembly of the two.

[0052] The analysis unit of this embodiment includes, for example, a laser collector, a data analysis device, etc., so as to analyze the fracturing operation data. Specifically, the analysis unit is electrically connected to the sensor through the optical fiber 2, and the sensor transmits the collected fracturing operation data to the analysis unit.

[0053] In this embodiment, the analysis unit analyzes the fracturing operation data, generates a crack graph from the fracturing operation data through built-in special software, and uses the crack graph to display the real-time development and distribution of the cracks during the roof fracturing operation, which is conducive to real-time understanding of the fracturing situation. It can also adjust the fracturing parameters of the directional drilling rig in time according to the fracturing operation data and the crack graph, optimize the roof fracturing effect, and thus improve the fracturing operation effect. The fracturing parameters here include displacement, pressure, operation time and other parameters.

[0054] The disclosed embodiments can meet the real-time dynamic monitoring requirements for roof fracturing conditions, improve the accuracy of fracturing operation data collection, and provide a dynamic monitoring method for realizing a smart mine platform.

[0055] like Figure 3 As shown, the second embodiment of the present disclosure provides a directional drilling machine 300, including a drill rod 310 and any of the above-mentioned coal mine underground hydraulic fracturing detection devices. A fracturing tool is arranged at the end of the drill rod 310, and the fracturing tool includes, for example, a packer, a sliding sleeve, and an isolation valve, and the fracturing tool is used for fracturing and perforating operations after drilling.

[0056] Taking into account the long length of the drill rod 310, in the present embodiment, the drill rod 310 includes a plurality of drill rod units 310a, and the plurality of drill rod units 310a are connected in series in sequence. Here, the length of the drill rod unit 310a is preferably 3m. By connecting the plurality of drill rod units 310a in sequence, the length requirement of the drill rod 310 can be met.

[0057] Further, the mounting structure 1 on the detection unit 100 is respectively connected to two adjacent drill rod units 310a. The mounting structure 1 here can be connected to any two adjacent drill rod units 310a, so as to ensure that the optical fiber 2 and the drill rod 310 always extend in the same direction. Of course, the mounting structure 1 can also be arranged in an interval manner.

[0058] Furthermore, the directional drilling rig 300 includes a walking system 330, on which a power system 320, a winch assembly 340 and a drill rod conveying system 350 are arranged, and the winch assembly 340 and the drill rod conveying system 350 are connected to the power system 320 and powered by the power system 320, wherein the walking system 330 is used to realize the walking of the directional drilling rig 300, the winch assembly 340 is used to realize the lowering and recovery of the optical fiber 2, and the drill rod conveying system 350 is used to realize the conveyance of the drill rod 310.

[0059] Specifically, the walking system 330 includes at least a crawler 331 and a hydraulic motor 332 , wherein the hydraulic motor 332 is used to drive the crawler 331 to achieve walking, a skid 333 is arranged on the crawler 331 , and the power system 320 , the winch assembly 340 and the drill rod conveying system 350 are arranged on the skid 333 .

[0060] Furthermore, the walking system 330 also includes an adjustment device, which is used to adjust the height and inclination of the skid 333. Here, the adjustment device includes, for example, two liftable support legs 334, which are respectively located at the front and rear of the skid 333. Through the lifting and lowering movement of each liftable support leg 334, the height and inclination of the skid 333 can be adjusted after the walking system 330 moves to a predetermined position. Through the adjustment of the posture of the skid 333, the position and inclination angle of the drill rod 310 can be further adjusted, so as to align the drill rod 310 with the borehole so that the drill rod 310 can smoothly enter the borehole. In addition, the power system 320 includes a motor, which converts electrical energy into kinetic energy or hydraulic energy to provide power for the winch assembly 340 and the drill rod conveying system 350.

[0061] The present invention can integrate the power system 320, the winch assembly 340 and the drill rod conveying system 350 on the skid frame 333. The equipment has a high degree of integration and a small overall length, width and height. At the same time, it drives the walking system to move autonomously in narrow tunnels to meet underground driving requirements.

[0062] Furthermore, in order to achieve the lowering and recovery of the optical fiber 2, the winch assembly 340 includes a rotating shaft 341, and the rotating shaft 341 here can be connected to the power system 320, for example. A roller frame 342 is arranged on the rotating shaft 341, and the optical fiber 2 is arranged on the roller frame 342. By rotating the roller frame 342 around the rotating shaft 341, the lowering and recovery of the optical fiber 2 can be achieved.

[0063] Furthermore, in order to realize the installation and transportation of the drill rod 310, the drill rod transportation system 350 includes a clamping device 351 and an alignment device 352, wherein the clamping device 351 can slide on the skid 333, and the alignment device 352 is arranged at the front of the skid 333. Specifically, the clamping device 351 is used to clamp one drill rod unit 310a and can adjust its posture by rotation, and the clamping device 351 here can also move toward the alignment device 352; another drill rod unit 310a is arranged on the alignment device 352, and the clamping device 351 can connect the two drill rod units 310a and transport the connected drill rod 310 forward, and then the installation structure 1 is installed on the two adjacent drill rod units 310a, so that the detection unit 100 is arranged on the drill rod 310.

[0064] The working process of the directional drilling machine 300 disclosed in the present invention is as follows:

[0065] First, the directional drilling rig 300 is moved to a predetermined position and the drill rod 310 is moved to a designated operation position by the travel system 330, and then the position and inclination angle of the drill rod 310 are adjusted by the adjustment device so that the elevation angle of the drill rod 310 is aligned with the borehole; the power system 320 controls the drill rod conveying system 350 and the winch assembly 340 to lower the drill rod 310 and the detection unit 100 into the borehole. During fracturing, the fracturing fluid is conveyed through the drill rod 310 and the fracturing tool is used for fracturing, wherein, for example, the packer is used to realize the seat sealing, and the fracturing fluid is sprayed out by the spray gun to complete the perforation and fracturing operation; at the same time, the fracturing operation process is detected by the sensor and the collected fracturing operation data is transmitted to the analysis unit through the optical fiber 2.

[0066] Finally, the fracturing operation data is analyzed by the analysis unit, and a crack graph is generated from the fracturing operation data. The crack graph is used to display the development and distribution of cracks in real time during the roof fracturing operation. According to the fracturing operation data and the crack graph, the fracturing parameters are adjusted in time to optimize the roof fracturing effect.

[0067] The disclosed embodiments can meet the real-time dynamic monitoring requirements for roof fracturing conditions, improve the accuracy of fracturing operation data collection, and provide a dynamic monitoring method for realizing a smart mine platform.

[0068] like Figure 4 As shown, the third embodiment of the present disclosure provides a method for detecting hydraulic fracturing in an underground coal mine, which is implemented by using any of the above-mentioned devices for detecting hydraulic fracturing in an underground coal mine, such as Figure 4 As shown, the following steps are included:

[0069] Step S100: the detection unit 100 is lowered into the borehole along with the drill rod 310;

[0070] Step S200: starting the perforation and fracturing operation, the sensor 1 detects the fracturing operation process, and transmits the collected fracturing operation data to the analysis unit through the optical fiber 2;

[0071] Step S300: the analysis unit analyzes the fracturing operation data and generates a crack graph from the fracturing operation data;

[0072] Step S400: timely adjusting the fracturing parameters according to the fracturing operation data and the fracture graph.

[0073] Further, on the basis of step S100, the detection unit 100 is lowered into the borehole along with the drill rod 310, including realizing directional drilling through the drill rod 310, and the sensor 1 can enter the borehole along with the drill rod 310, thereby realizing the detection of the roof fracturing effect.

[0074] Further, on the basis of step S200, the perforating and fracturing operations are started, the sensor 1 detects the fracturing operation process, and transmits the collected fracturing operation data to the analysis unit through the optical fiber 2, including the fracturing fluid being transported through the drill pipe 310, and the perforating and fracturing operations are performed through the fracturing tool. At the same time, the fracturing operation process is detected by the sensor 1 and the collected fracturing operation data is transmitted to the analysis unit through the optical fiber 2.

[0075] Further, on the basis of step S300, the analysis unit analyzes the fracturing operation data and generates a crack graph from the fracturing operation data, including the fracturing operation data including the temperature of the fracturing fluid, the pressure of the fracturing fluid, and the fluctuation parameters of the formation of rock fractures and other operation data. The analysis unit analyzes the fracturing operation data and generates a crack graph from the fracturing operation data through built-in special software. The crack graph is used to display the development and distribution of the cracks in the process of the roof fracturing operation in real time, which is beneficial for construction personnel to understand the fracturing situation in real time, such as data information on the extension depth of the crack, the development radius, and the change of ground stress.

[0076] Furthermore, on the basis of step S400, the fracturing parameters are adjusted in time according to the fracturing operation data and the crack graph. For example, the control device or the construction personnel can adjust the fracturing parameters of the directional drill rig 300, such as displacement, pressure, operation time and other parameters, in time according to the fracturing operation data and the crack graph to optimize the roof fracturing effect, thereby improving the fracturing operation effect.

[0077] The disclosed embodiments can meet the real-time dynamic monitoring requirements for roof fracturing conditions, improve the accuracy of fracturing operation data collection, and provide a dynamic monitoring method for realizing a smart mine platform.

[0078] In the above embodiments of the present disclosure, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0080] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present disclosure.

[0081] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0082] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A coal mine underground hydraulic fracturing detection device, characterized in that: The invention comprises a detection unit and an analysis unit, wherein the detection unit is arranged on the outside of a drill rod, the detection unit comprises an optical fiber and at least one mounting structure connected to the drill rod, the optical fiber is arranged on the mounting structure and arranged along the length direction of the drill rod, the detection unit and the analysis unit are connected via the optical fiber, one or more sensors are arranged on the optical fiber, and the sensors can enter the borehole along with the optical fiber.

2. The underground hydraulic fracturing detection device of coal mine according to claim 1, characterized in that: A first sealing structure is sleeved on the end of the optical fiber, and at least one of the sensors is arranged in the first sealing structure.

3. The underground coal mine hydraulic fracturing detection device according to claim 2, characterized in that: The sensor comprises at least a temperature sensor, a pressure sensor and a vibration sensor. The temperature sensor and the vibration sensor are arranged in the first sealing structure, and the pressure sensor is arranged on the outer surface of the first sealing structure.

4. The underground coal mine hydraulic fracturing detection device according to claim 3, characterized in that: A protective sleeve is provided outside the pressure sensor, and a through hole is provided on the protective sleeve.

5. The underground coal mine hydraulic fracturing detection device according to claim 2, characterized in that: The first sealing structure is a structure with openings at both ends, and a plug is provided at the front end away from the optical fiber.

6. The underground coal mine hydraulic fracturing detection device according to claim 2, characterized in that: An armor structure is arranged outside the optical fiber, the armor structure is connected to the first sealing structure through a connector, and a second sealing structure is arranged inside the armor structure near the connector.

7. A directional drilling machine, characterized in that: The invention comprises a drill rod and an underground coal mine hydraulic fracturing detection device according to any one of claims 1 to 6, wherein a fracturing tool is arranged at the end of the drill rod.

8. The directional drilling machine according to claim 7, characterized in that: The drill rod comprises a plurality of drill rod units, the plurality of drill rod units are sequentially connected in series, and the mounting structure is respectively connected to two adjacent drill rod units.

9. The directional drilling machine according to claim 7, characterized in that: It also includes a walking system, on which a power system, a winch assembly and a drill rod conveying system are arranged. The winch assembly and the drill rod conveying system are respectively connected to the power system. The winch assembly is used to drive the movement of the optical fiber, and the drill rod conveying system is used to realize the conveyance of the drill rod.

10. A method for detecting hydraulic fracturing in underground coal mines, characterized in that: include: Lower the detection unit into the borehole along with the drill pipe; During the perforation and fracturing operation, the fracturing operation data is acquired through the sensor in the detection unit, and the fracturing operation data is transmitted to the analysis unit through the optical fiber in the detection unit; The analysis unit analyzes the fracturing operation data and generates a crack graph from the fracturing operation data; The fracturing parameters are adjusted according to the fracturing operation data and the crack graph.

Images