Underground coal mine hydraulic fracturing detection device and coiled tubing equipment

Abstract

The utility model provides a coal mine underground hydraulic fracturing detection device and coiled tubing equipment, the detection device comprises a detection unit, the detection unit is arranged in a coiled tubing, the end part of the coiled tubing is provided with a fracturing tool, the detection unit comprises an optical fiber, and the optical fiber is connected with the coiled tubing. The optical fiber is arranged in the continuous oil pipe in the length direction of the continuous oil pipe and extends into the fracturing tool, one or more sensors are arranged on the optical fiber, and the sensors can enter a drill hole along with the continuous oil pipe. According to the embodiment of the utility model, the real-time dynamic monitoring requirement on the hydraulic fracturing condition of the underground coal mine can be met, the acquisition precision of fracturing operation data is improved, and a dynamic monitoring means is provided for realizing an intelligent mine large platform.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fracturing detection, in particular to a coal mine underground hydraulic fracturing detection device and continuous oil pipe equipment. BACKGROUND

[0002] The roof refers to the rock layer on the roadway roof in the mine. Fracturing refers to a method of forming cracks in the stratum by using the pressure transmission of fracturing fluid. The coal mine underground hydraulic fracturing technology is to inject high-pressure fracturing fluid into the target rock layer, form a crack network system by modifying the rock layer structure, weaken the strength and integrity of the roof, divide the complete rock layer into multiple layers, make the goaf roof be able to collapse in layers and stages, shorten the initial pressure and periodic pressure step distance, weaken the transfer of high stress to the adjacent roadway, thereby slow down the deformation of the adjacent roadway, and have important significance for mine safety production.

[0003] In the global mining industry, coal mine underground hydraulic fracturing effect detection and evaluation is a very important work. It is also the most critical link affecting the safety of mine exploitation, especially the temperature and pressure data in the mine. Therefore, it is necessary to accurately detect these data in real time at present, so as to obtain the relevant underground information in time, which has extraordinary significance for underground mining.

[0004] At present, the detection and evaluation of coal mine underground hydraulic fracturing mainly use the peeping technology and microseismic detection technology. The peeping technology needs to extend the peeping mirror into the borehole after the fracturing construction is completed to probe the crack condition in the hole, but this technology can only detect the crack condition near the hole wall, and cannot detect the crack extension depth, development radius, and ground stress change. The microseismic detection technology is to collect the vibration wave in the fracturing process by the sensor arranged near the hole wall or other positions, collect the data, which can only collect the vibration, cannot collect the pressure and temperature change data, and the detection precision of the fracturing operation data is insufficient. UTILITY MODEL CONTENT

[0005] In order to solve the problem that the detection data is insufficient and the data precision is insufficient in the fracturing operation process in the prior art, so as to realize the judgment of the fracturing effect, the utility model embodiment provides a coal mine underground hydraulic fracturing detection device and continuous oil pipe equipment.

[0006] Therefore, one aspect of the present application provides a coal mine underground hydraulic fracturing detection device, which comprises a detection unit, the detection unit is arranged in a coiled tubing, the end of the coiled tubing is provided with a fracturing tool, the detection unit comprises an optical fiber, the optical fiber is arranged in the coiled tubing and extends to the fracturing tool along the length direction of the coiled tubing, one or more sensors are arranged on the optical fiber, and the sensors can enter a borehole along with the coiled tubing.

[0007] In some embodiments, the end of the optical fiber is sleeved with a first sealing structure, the sensors at least include 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.

[0008] In some embodiments, a protective sleeve is sleeved outside the pressure sensor, and a through hole is arranged on the protective sleeve.

[0009] In some embodiments, an armored structure is arranged outside the optical fiber, and the armored structure is in communication with the first sealing structure through a connecting piece.

[0010] In some embodiments, a second sealing structure is arranged in the armored structure and close to the connecting piece.

[0011] In some embodiments, the sensors are arranged inside the fracturing tool.

[0012] In some embodiments, an analysis unit is further included, the sensors are electrically connected with the analysis unit, and the analysis unit generates crack-related data based on fracturing operation data collected by the sensors.

[0013] Another aspect of the present application provides a coiled tubing device, which comprises a coiled tubing and the coal mine underground hydraulic fracturing detection device according to any one of the preceding items, and the end of the coiled tubing is provided with a fracturing tool.

[0014] In some embodiments, a walking system is included, a power system, a control system, a tubing conveying system and an injection head are arranged on the walking system, the tubing conveying system and the injection head are connected with the power system respectively, the control system is electrically connected with the power system, the injection head is used for lowering the coiled tubing, and the tubing conveying system is used for recovering the coiled tubing.

[0015] In some embodiments, the injection head is connected with the walking system through a support, the support is rotationally connected with the injection head, the injection head is further connected with the walking system through an adjusting oil cylinder, and the adjusting oil cylinder can drive the injection head to rotate by extension and retraction.

[0016] This utility model embodiment can meet the real-time dynamic monitoring needs of hydraulic fracturing in coal mines, improve the data acquisition accuracy of fracturing operations, and provide dynamic monitoring means for realizing a smart mine platform.

[0017] To make the above-mentioned objects, features and advantages of the present utility model embodiments more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method. The accompanying drawings, which are provided to further understand the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is an installation diagram of the hydraulic fracturing detection device for coal mines provided in this embodiment of the utility model;

[0020] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle;

[0021] Figure 3 This is a schematic diagram of the structure of the coiled tubing equipment provided in the third embodiment of this utility model;

[0022] Figure 4 This is a structural schematic diagram of the coiled tubing equipment provided in the fourth embodiment of this utility model.

[0023] Among them, the above-mentioned appendix Figures 1 to 4 The following reference numerals are included:

[0024] 1 - sensor; 11 - temperature sensor; 12 - pressure sensor; 13 - vibration sensor; 2 - optical fiber; 21 - armored structure; 3 - first sealing structure; 31 - plug; 4 - protective sleeve; 4a - through hole; 5 - connecting piece; 6 - second sealing structure; 100 - detection unit; 300 - coiled tubing equipment; 310 - coiled tubing; 311 - swivel; 312 - fracturing tool; 313 - hydraulic release; 314 - first packer; 315 - centralizer; 316 - perforating gun; 317 - second packer; 318 - guide head; 320 - control system; 330 - traveling system; 331 - track; 332 - hydraulic motor; 333 - skid; 340 - tubing conveying system; 341 - rotating shaft; 342 - drum frame; 350 - injection head; 351 - adjusting cylinder; 352 - support; 360 - first traveling system; 361 - first track; 362 - first hydraulic motor; 363 - first skid; 370 - second traveling system; 371 - second track; 372 - second hydraulic motor; 373 - second skid; 380 - power system. DETAILED DESCRIPTION

[0025] Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. The present application should not be construed as being limited to the following embodiments.

[0026] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be construed as limiting, but merely as exemplification of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0028] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example, with reference to the attached drawings.

[0029] It should also be understood that, although the present application has been described above with reference to certain specific embodiments, many other equivalents forms of the present application will be apparent to those skilled in the art in view of the above teachings, the general principles described above and the attached drawings. The described embodiments are to be considered in all respects as illustrative only and not restrictive in character.

[0030] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0031] The specific embodiments of the present application will be described with reference to the drawings after which the generic nature of the application will become clear with a good understanding of the application. It is to be understood that the disclosed embodiments are merely examples of the present application and can be practiced in various ways. Well-known and / or repetitive functionality and structure are not discussed in great detail to avoid obscuring the present application. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and a representative basis for teaching one skilled in the art to variously employ the present application.

[0032] It should be noted that the terms "first", "second", and the like, in the description and in the claims of the present application as well as above-mentioned drawings mean for distinguishing between like objects and do not necessarily have to imply a serial or chronological order. It is to be understood that the data so distinguished can be interchanged under appropriate circumstances such that the embodiments of the application described herein can be practiced in other than the recited order of steps. Moreover, the terms "comprise", "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, article, or apparatus that comprises a list of steps or units can not necessarily be limited to those steps or units, but can include additional steps or units not expressly listed or inherent to such process, method, article, or apparatus.

[0033] The present specification can use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can refer to one or more of the same or different embodiments of the application.

[0034] The first embodiment of the present application provides a coal mine underground hydraulic fracturing detection device, the coal mine underground hydraulic fracturing detection device is arranged on the coiled tubing equipment 300, the coiled tubing equipment 300 of the embodiment includes the coiled tubing 310, the end of the coiled tubing 310 is provided with the fracturing tool 312, the coiled tubing equipment 300 is advanced along the directional borehole through the coiled tubing 310, and then the perforating and fracturing operation is realized through the fracturing tool 312.

[0035] As Figure 1As shown, the coal mine underground hydraulic fracturing detection device is arranged on the coiled tubing 310 of the coiled tubing equipment 300, and comprises a detection unit 100 and an analysis unit; the detection unit 100 comprises an optical fiber 2 arranged inside the coiled tubing 310 and the fracturing tool 312, and the optical fiber 2 is arranged along the length direction of the coiled tubing 310 and the fracturing tool 312, so as to facilitate the common movement with the coiled tubing 310 and the fracturing tool 312; the end of the optical fiber 2 is connected with at least one sensor 1, and the fracturing operation data in the fracturing operation process is collected through the sensor 1.

[0036] The analysis unit is electrically connected with the sensor 1, and in this embodiment, the analysis unit is arranged on the ground and is connected with the sensor 1 through the optical fiber 2. In this embodiment, the analysis unit and the detection unit 100 are two independent units, so that the detection unit 100 and the analysis unit can realize joint operation when the coiled tubing 310 is operated alone underground, and the two units can also be quickly assembled.

[0037] The analysis unit in this embodiment comprises a laser collector, a data analysis device and the like, so as to analyze the fracturing operation data. Specifically, the analysis unit is electrically connected with the sensor 1 through the optical fiber 2, and the sensor 1 transmits the collected fracturing operation data to the analysis unit.

[0038] In this embodiment, the coiled tubing 310 advances in the roof rock along the directional borehole, and the sensor 1 can enter the borehole along with the coiled tubing 310, so that the fracturing operation data in the fracturing operation process is collected through the sensor 1 when the fracturing operation is performed through the coiled tubing equipment, and the fracturing operation data comprises the temperature of the fracturing fluid, the pressure of the fracturing fluid, the fluctuation parameters of the rock fracture formation and the like. The sensor 1 transmits the collected fracturing operation data to the analysis unit, the analysis unit analyzes the fracturing operation data, generates a fracture pattern through the built-in special software, and uses the fracture pattern to display the crack development and distribution in the coal mine underground hydraulic fracturing operation process in real time, which is beneficial to the real-time understanding of the fracturing situation, and can also adjust the fracturing parameters of the coiled tubing equipment in time according to the fracturing operation data and the fracture pattern, so as to optimize the coal mine underground hydraulic fracturing effect, thereby improving the fracturing operation effect; the fracturing parameters comprise the displacement, the pressure, the operation time and the like; in this embodiment, the fracture extension depth, the development radius, the change of the ground stress and the like can be obtained through the fracture pattern.

[0039] Thus, in the present embodiment, the detection unit 100 can monitor the pressure borne by the roof, the temperature of the fracturing fluid, the propagation of the fracturing fluid, and the vibration when the fracture is opened in real time during the fracturing operation, and the analysis unit can generate a fracture pattern from the fracturing operation data, so as to monitor the development and distribution of the fracture in real time during the hydraulic fracturing operation in the coal mine, thereby realizing real-time monitoring and analysis of the dynamic changes of the rock parameters and the fluid.

[0040] Further, the sensor 1 is arranged inside the fracturing tool 312, and is arranged close to the formation, so that the fracturing operation data measured by the sensor 1 is close to the real data when the formation is fractured, and the problem that the fracturing operation data measured is inaccurate due to the change of the formation temperature and pressure when the fracture is opened can be solved.

[0041] Further, as shown in Figure 2 In order to protect the sensor 1, the end of the optical fiber 2 is sleeved with a first sealing structure 3, and the sensor 1 is arranged on the first sealing structure 3. The sensor 1 at least includes a temperature sensor 11, a pressure sensor 12, and a vibration sensor 13. The temperature sensor 11, the pressure sensor 12, and the vibration sensor 13 are connected with the optical fiber 2 through wires. 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 fracture formation and extension (or development). The fluctuation is generally conducted through the fracturing fluid.

[0042] Specifically, the temperature sensor 11 and the vibration sensor 13 are arranged in the first sealing structure 3, and the temperature and fluctuation are detected through the wall surface of the first sealing structure 3. The first sealing structure 3 protects the temperature sensor 11 and the vibration sensor 13, so that the temperature sensor 11 and the vibration sensor 13 are prevented from colliding and rubbing with the fracturing tool 312 during the pushing and withdrawing of the coiled tubing 310 into the borehole, and the temperature sensor 11 and the vibration sensor 13 are also prevented from being damaged by the scouring of the fracturing fluid.

[0043] The pressure sensor 12 is arranged on the outer surface of the first sealing structure 3, so that the pressure sensor 12 can be in contact with the fracturing fluid to detect the pressure of the fracturing fluid. Further, in order to protect the pressure sensor 12, a protective sleeve 4 is arranged outside the pressure sensor 12, and the protective sleeve 4 is provided with a through hole 4a for the inflow of the fracturing fluid, and the pressure sensor 12 detects the pressure of the fracturing fluid flowing through the through hole 4a. The protective sleeve 4 protects the pressure sensor 12, and can avoid the pressure sensor 12 from colliding and rubbing with the fracturing tool 312 during the pushing or withdrawing of the coiled tubing 310 into or out of the borehole.

[0044] In the embodiment, a cladding structure 21 is arranged outside the optical fiber 2, the cladding structure 21 is made of stainless steel, and the cladding structure 21 seals and protects the optical fiber 2. During the pushing or withdrawing of the drill pipe 310 into or out of the borehole, the cladding structure 21 can avoid the optical fiber 2 from colliding and rubbing with the coiled tubing 310 and the fracturing tool 312, and can also avoid the fracturing fluid from damaging the optical fiber 2.

[0045] Further, the cladding structure 21 and the first sealing structure 3 are connected through a connecting piece 5, and the connecting piece 5 is an open structure at both ends, the first end of the connecting piece 5 is connected with the first sealing structure 3, and the second end of the connecting piece 5 is connected with the cladding structure 21, for example, the first end and the second end of the connecting piece 5 are respectively connected with the inner walls of the ends of the cladding structure 21 and the first sealing structure 3. The sizes of the first end and the second end are respectively determined based on the sizes of the ends of the first sealing structure 3 and the cladding structure 21, and the connecting piece 5 can connect the cladding structure 21 and the first sealing structure 3.

[0046] Further, the second sealing structure 6 is arranged inside the cladding structure 21 and close to the connecting piece 5, and the second sealing structure 6 can prevent the fracturing fluid from entering the inside of the cladding structure 21 and reduce the damage of the fracturing fluid to the optical fiber 2.

[0047] Further, since the cladding structure 21 is arranged outside the optical fiber 2, in order to avoid the influence of the cladding structure 21 on the flow of the fracturing fluid in the coiled tubing 310, a coiled tubing 310 with a larger diameter should be selected, and preferably, the diameter of the coiled tubing 310 is greater than or equal to 1.5 inches.

[0048] Preferably, the first sealing structure 3 is a cylindrical or shell-shaped structure open at both ends, which is for example sleeved on the end of the optical fiber 2. Further, a plug 31 is arranged away from the end of the optical fiber 2, which is used to seal the head end of the first sealing structure 3, so as to prevent the fracturing fluid from entering the inside of the first sealing structure.

[0049] The embodiment of the utility model can realize the real-time dynamic monitoring demand of the coal mine underground hydraulic fracturing, improve the collection precision of fracturing operation data, and provide a dynamic monitoring means for realizing a smart mine platform.

[0050] The second embodiment of the utility model provides a kind of coal mine underground hydraulic fracturing detection method, is realized using the coal mine underground hydraulic fracturing detection device described in any one of the above, comprising the following steps:

[0051] Step S100: the detection unit 100 is lowered into borehole with the continuous tubing 310 and the fracturing tool 312;

[0052] Step S200: start perforating and fracturing operation, the sensor 1 detects fracturing operation process, and the fracturing operation data collected is transmitted to the analysis unit by the optical fiber 2;

[0053] Step S300: the analysis unit analyzes the fracturing operation data, and generates fracture pattern from the fracturing operation data;

[0054] Step S400: according to the fracturing operation data and fracture pattern, timely adjust fracturing parameter.

[0055] Further, on the basis of the step S100, the detection unit 100 is lowered into borehole with the continuous tubing 310, including advancing in directional borehole in roof stratum by the continuous tubing 310, the sensor 1 can enter borehole with the continuous tubing 310, so as to realize the detection of coal mine underground hydraulic fracturing effect.

[0056] Further, on the basis of the step S200, start perforating and fracturing operation, the sensor 1 detects fracturing operation process, and the fracturing operation data collected is transmitted to the analysis unit by the optical fiber 2, including that fracturing fluid is transported by the continuous tubing 310, and is perforated and fractured by the fracturing tool, while, the fracturing operation process is detected by the sensor 1 and the fracturing operation data collected is transmitted to the analysis unit by the optical fiber 2.

[0057] Further, on the basis of the step S300, the analysis unit analyzes the fracturing operation data, generates a fracture pattern from the fracturing operation data, and the fracturing operation data includes operation data such as the temperature of the fracturing fluid, the pressure of the fracturing fluid, and the fluctuation parameters of the formation fracture formation, the analysis unit analyzes the fracturing operation data, generates a fracture pattern from the fracturing operation data through the built-in special software, and uses the fracture pattern to display the crack development and distribution in the coal mine underground hydraulic fracturing operation process in real time, which is beneficial to the construction personnel to understand the fracturing situation in real time, such as the crack propagation depth, development radius, and data information of the change of ground stress.

[0058] Further, on the basis of the step S400, the fracturing parameters are adjusted in a timely manner according to the fracturing operation data and the fracture pattern, including that the coiled tubing equipment or the construction personnel can adjust the fracturing parameters of the coiled tubing equipment 300, such as the displacement, the pressure, the operation time and the like, according to the fracturing operation data and the fracture pattern, and optimize the coal mine underground hydraulic fracturing effect, thereby improving the fracturing operation effect.

[0059] The embodiment of the utility model can realize the real-time dynamic monitoring demand of the coal mine underground hydraulic fracturing situation, improve the collection accuracy of the fracturing operation data, and provide a dynamic monitoring means for realizing the wisdom mine big platform.

[0060] As shown in Figure 3 The third embodiment of the utility model provides a coiled tubing equipment 300, which comprises a coiled tubing 310, a fracturing tool 312 and the coal mine underground hydraulic fracturing detection device.

[0061] Further, the first sealing structure 3 is arranged in the fracturing tool 312, the fracturing tool 312 is connected with the coiled tubing 310 through the adapter 311, the adapter 311 is a hollow structure, so that the fracturing fluid in the coiled tubing 310 enters the fracturing tool 312, and then the coal mine underground hydraulic fracturing operation is realized.

[0062] Specifically, one end of the adapter 311 is connected to the coiled tubing 310, and the other end is connected to the hydraulic release 313, the first packer 314, the centralizer 315, the perforating gun 316, the second packer 317 and the guide head 318 in the fracturing tool 312 in sequence. In order to facilitate the collection of the temperature, pressure and vibration data of the fracturing fluid in the fracturing operation by the sensor 1, the first sealing structure 3 is arranged between the first packer 314 and the second packer 317, and more specifically, the first sealing structure 3 is arranged inside the perforating gun 316, which is closer to the fracturing position of the formation. Therefore, the fracturing operation data measured by the sensor 1 at this position is closer to the real data of the hydraulic fracturing in the coal mine, and the detection accuracy of the hydraulic fracturing in the coal mine is improved.

[0063] Further, the coiled tubing device 300 comprises a walking system 330, and a power system 380, a control system 320, a tubing conveying system 340 and an injection head 350 are arranged on the walking system 330. The tubing conveying system 340 and the injection head 350 are connected to the power system 380 and are powered by the power system 380. The control system is electrically connected to the power system 380 and is used to control the start and stop of the power system 380. The walking system 330 is used to realize the walking of the coiled tubing device 300, and the tubing conveying system 340 is used to realize the recovery of the coiled tubing 310. The injection head 350 can provide sufficient pushing and pulling force to realize the lowering of the coiled tubing 310.

[0064] Specifically, the walking system 330 comprises at least a caterpillar 331 and a hydraulic motor 332. The hydraulic motor 332 is used to drive the caterpillar 331 to realize walking. A skid 333 is arranged on the caterpillar 331. The power system 380, the tubing conveying system 340 and the injection head 350 are arranged on the skid 333.

[0065] Further, due to the different structure of the well, the borehole in the coal mine is upward, and the optical fiber 2 must be sent into the borehole by external force. In the embodiment, the injection head 350 is applied to provide a pushing force or a pulling force for the coiled tubing 310 to enter or exit the upward borehole. Specifically, the injection head 350 is fixed on the skid 333 through a support 352, the support 352 is rotationally connected with the injection head 350, for example, hinged, and more specifically, the injection head 350 is further connected with the skid 333 through an adjusting oil cylinder 351, the adjusting oil cylinder 351 can drive the injection head to rotate around the connection between the support 352 and the injection head 350 by extending or retracting, thereby adjusting the height and inclination degree of the injection head 350. The position and inclination angle of the coiled tubing 310 can be further adjusted by adjusting the posture of the injection head 350, so as to align the coiled tubing 310 with the borehole, so that the coiled tubing 310 can smoothly enter the borehole.

[0066] In addition, the power system 380 includes a motor that converts electrical energy into kinetic energy or hydraulic energy to power the tubing delivery system 340 and the injection head 350.

[0067] The power system 380, the tubing delivery system 340, and the injection head 350 are integrated on the skid 333, so that the device has high integration degree, small overall length, width, and height, and the walking system can be driven to autonomously walk in a narrow roadway to meet the underground driving requirements.

[0068] Further, in order to realize the recovery of the optical fiber 2, the tubing delivery system 340 includes a rotating shaft 341, which can be connected with the power system 380, for example. A drum frame 342 is arranged on the rotating shaft 341, and the coiled tubing 310 is arranged on the drum frame 342. The coiled tubing 310 can be recovered by rotating the drum frame 342 around the rotating shaft 341. In the embodiment, after a single-stage fracturing operation is completed, the drum frame 342 is controlled to rotate to complete the recovery of the coiled tubing 310. After the operation is completed, the drum frame 342 is controlled to rotate to withdraw the fracturing tool 312, the sensor 1, and the like from the wellhead to end the operation.

[0069] The working process of the coiled tubing device 300 in the embodiment is as follows:

[0070] Firstly, the coiled tubing equipment 300 is moved to a predetermined position by walking of the walking system 330, and then the injection head 350 is used to adjust the inclination angle of the coiled tubing 310 so that the elevation angle of the coiled tubing 310 is aligned with the borehole; the power system 380 controls the injection head 350 and the tubing conveying system 340 to lower the coiled tubing 310 and the detection unit 100 into the borehole. During fracturing, the fracturing fluid is conveyed through the coiled tubing 310 and the fracturing work is performed through the fracturing tool 312, wherein the fracturing is achieved through the first packer 314 and the second packer 317, the fracturing fluid is sprayed through the perforating gun 316, and the perforating and fracturing operations are completed; at the same time, the fracturing operation process is detected through the sensor 1, and the collected fracturing operation data is transmitted to the analysis unit through the optical fiber 2.

[0071] Finally, the fracturing operation data is analyzed by the analysis unit, the fracturing operation data is generated into a fracture pattern, and the fracture pattern is used for real-time display of crack development and distribution during the hydraulic fracturing operation in the coal mine; according to the fracturing operation data and the fracture pattern, the fracturing parameters are adjusted in time, and the hydraulic fracturing effect in the coal mine is optimized.

[0072] The embodiment of the utility model can realize the real-time dynamic monitoring demand of the hydraulic fracturing condition in the coal mine, improve the collection accuracy of the fracturing operation data, and provide a dynamic monitoring means for realizing the wisdom mine big platform.

[0073] As shown in Figure 4 The fourth embodiment of the utility model provides a coiled tubing equipment 300, which comprises a coiled tubing 310, a fracturing tool 312 and the coal mine hydraulic fracturing detection device of any one of the above. The fracturing tool is used for fracturing perforating operation after drilling.

[0074] The difference between the embodiment and the third embodiment is that:

[0075] The coiled tubing device 300 comprises a first walking system 360 and a second walking system 370, the first walking system 360 is provided with the injection head 350 and is used to realize walking of the injection head 350; the second walking system 370 is provided with a power system 380 and a tubing conveying system 340, more specifically, the tubing conveying system 340 and the injection head 350 are connected with the power system 380 and are powered by the power system 380, and the second walking system 370 is used to realize walking of the power system 380 and the tubing conveying system 340. Specifically, the injection head 350 can provide sufficient pushing and pulling force to realize lowering of the coiled tubing 310, and the tubing conveying system 340 is used to realize recovery of the coiled tubing 310.

[0076] Specifically, the first walking system 360 at least comprises a first caterpillar track 361 and a first hydraulic motor 362, the first hydraulic motor 362 is used to drive the first caterpillar track 361 to realize walking, and a first skid frame 363 is arranged on the first caterpillar track 361, and the injection head 350 is arranged on the first skid frame 333.

[0077] Specifically, the second walking system 370 at least comprises a second caterpillar track 371 and a second hydraulic motor 372, the second hydraulic motor 372 is used to drive the second caterpillar track 371 to realize walking, and a second skid frame 373 is arranged on the second caterpillar track 371, and the power system 380 and the tubing conveying system 340 are arranged on the second skid frame 373.

[0078] Further, due to different structures of the well, the drilling hole in the coal mine is an upward hole, and the optical fiber 2 must be sent into the hole by external force, in the embodiment, the injection head 350 is applied to provide pushing force or pulling force for the coiled tubing 310, so that the coiled tubing 310 enters or exits the upward hole. Specifically, the injection head 350 is fixed on the first skid frame 363 through a support, the support is rotationally connected with the injection head 350, for example, hinged, and more specifically, the injection head 350 is further connected with the first skid frame 363 through an adjusting oil cylinder, the adjusting oil cylinder can be extended or retracted to drive the injection head to rotate around the connection position between the support 352 and the injection head 350, and then the height and inclination degree of the injection head 350 are adjusted, and the position and inclination angle of the coiled tubing 310 are further adjusted through adjustment of the posture of the injection head 350, so that the coiled tubing 310 is aligned with the drilling hole, and the coiled tubing 310 can smoothly enter the drilling hole. It should be noted that the height and inclination angle adjustment principle of the injection head 350 is the same as that of the third embodiment of the utility model.

[0079] In addition, the power system 380 includes a motor that converts electrical energy into kinetic or hydraulic energy to power the tubing delivery system 340 and the injection head 350.

[0080] The power system 380, the tubing delivery system 340, and the injection head 350 are arranged on different walking systems, that is, the injection head 350 is arranged on the first walking system 360, and the power system 380 and the tubing delivery system 340 are integrated on the second walking system 370. This split structure is suitable for long drilling conditions. Under this condition, the required coiled tubing is longer, the injection head is pressed harder, the equipment power of the selected power system 380 and the injection head 350 is higher, the volume of the tubing delivery system 340 and the overall volume of the equipment are increased, and the working pressure is higher. If the power system 380, the tubing delivery system 340, and the injection head 350 are all designed on the same walking system, the space in the roadway is narrow, and the equipment cannot be lowered into the well for operation.

[0081] The working process of the coiled tubing equipment 300 in the embodiment is as follows:

[0082] Firstly, the coiled tubing equipment 300 is moved to a predetermined position by walking of the first walking system 360 and the second walking system 370, and then the inclination angle of the coiled tubing 310 is adjusted by adjusting the attitude of the injection head 350, so that the elevation angle of the coiled tubing 310 is aligned with the drilling hole. The power system 380 controls the injection head 350 and the tubing delivery system 340 to lower the coiled tubing 310 and the detection unit 100 into the drilling hole. During fracturing, the fracturing fluid is delivered through the coiled tubing 310 and fractured through the fracturing tool 312, for example, the fracturing fluid is sprayed through the first packer 314 and the second packer 317, and the perforating gun 316 is used to complete the perforation and fracturing operation. At the same time, the sensor 1 detects the fracturing operation process and transmits the collected fracturing operation data to the analysis unit through the optical fiber 2.

[0083] Finally, the fracturing operation data is analyzed by the analysis unit, the fracturing operation data is generated into a fracture pattern, and the fracture pattern is used for real-time display of the crack development and distribution during the hydraulic fracturing operation in the coal mine. According to the fracturing operation data and the fracture pattern, the fracturing parameters are adjusted in time, and the hydraulic fracturing effect in the coal mine is optimized.

[0084] The embodiment of the utility model can realize real-time dynamic monitoring of the hydraulic fracturing in the coal mine, improve the collection accuracy of the fracturing operation data, and provide a dynamic monitoring means for realizing the intelligent mine platform.

[0085] In the above embodiments of the utility model, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be seen in the related description of other embodiments.

[0086] For ease of description, spatial relative terms such as "above", "upper", "top", "up", etc. can be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned 90 degrees or in other orientations in other different ways, and the spatial relative description used herein is interpreted accordingly.

[0087] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in the specification refer to the specific features, structures or characteristics described in conjunction with the embodiment, which are included in at least one embodiment described in the general description of the application. The same description appearing in several places in the specification does not necessarily refer to the same embodiment.

[0088] Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the utility model.

[0089] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be seen in the related description of other embodiments.

[0090] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A coal mine underground hydraulic fracturing detection device, characterized in that, The device comprises a detection unit arranged in a coiled tubing, an end of the coiled tubing is provided with a fracturing tool, the detection unit comprises an optical fiber arranged in the coiled tubing along the length direction of the coiled tubing and extending into the fracturing tool, one or more sensors are arranged on the optical fiber, the sensors can enter a borehole with the coiled tubing.

2. The coal mine underground hydraulic fracturing detection device according to claim 1, characterized in that, An end of the optical fiber is sleeved with a first sealing structure, the sensors at least include 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 an outer surface of the first sealing structure.

3. The coal mine underground hydraulic fracturing detection device according to claim 2, characterized in that, A protective sleeve is sleeved outside the pressure sensor, and a through hole is arranged on the protective sleeve.

4. The coal mine underground hydraulic fracturing detection device according to claim 2, characterized in that, An armor structure is arranged outside the optical fiber, and the armor structure is in communication with the first sealing structure through a connecting piece.

5. The coal mine underground hydraulic fracturing detection device according to claim 4, characterized in that, A second sealing structure is arranged in the armor structure close to the connecting piece.

6. The coal mine underground hydraulic fracturing detection device according to claim 1, characterized in that, The sensors are arranged inside the fracturing tool.

7. The coal mine underground hydraulic fracturing detection device according to claim 1, characterized in that, An analysis unit is further arranged, the sensors are electrically connected with the analysis unit, and the analysis unit generates crack-related data based on fracturing operation data collected by the sensors.

8. A coiled tubing apparatus, characterized by, The device comprises a coiled tubing and the coal mine underground hydraulic fracturing detection device of any one of claims 1-7.

9. The coiled tubing apparatus of claim 8, wherein, The device comprises a walking system, a power system, a control system, a tubing conveying system and an injection head are arranged on the walking system, the tubing conveying system and the injection head are connected with the power system respectively, the control system is electrically connected with the power system, the injection head is used to realize lowering of the coiled tubing, and the tubing conveying system is used to realize recovery of the coiled tubing.

10. The coiled tubing apparatus of claim 9, wherein, The injection head is connected with the walking system through a support, the support is rotationally connected with the injection head, and the injection head is further connected with the walking system through an adjusting oil cylinder, the adjusting oil cylinder can drive the injection head to rotate through extension and retraction. The device comprises a detection unit arranged in a coiled tubing, an end of the coiled tubing is provided with a fracturing tool, the detection unit comprises an optical fiber arranged in the coiled tubing along the length direction of the coiled tubing and extending into the fracturing tool, one or more sensors are arranged on the optical fiber, the sensors can enter a borehole with the coiled tubing.

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